10d160211SJeremy Fitzhardinge /* 20d160211SJeremy Fitzhardinge * Virtual network driver for conversing with remote driver backends. 30d160211SJeremy Fitzhardinge * 40d160211SJeremy Fitzhardinge * Copyright (c) 2002-2005, K A Fraser 50d160211SJeremy Fitzhardinge * Copyright (c) 2005, XenSource Ltd 60d160211SJeremy Fitzhardinge * 70d160211SJeremy Fitzhardinge * This program is free software; you can redistribute it and/or 80d160211SJeremy Fitzhardinge * modify it under the terms of the GNU General Public License version 2 90d160211SJeremy Fitzhardinge * as published by the Free Software Foundation; or, when distributed 100d160211SJeremy Fitzhardinge * separately from the Linux kernel or incorporated into other 110d160211SJeremy Fitzhardinge * software packages, subject to the following license: 120d160211SJeremy Fitzhardinge * 130d160211SJeremy Fitzhardinge * Permission is hereby granted, free of charge, to any person obtaining a copy 140d160211SJeremy Fitzhardinge * of this source file (the "Software"), to deal in the Software without 150d160211SJeremy Fitzhardinge * restriction, including without limitation the rights to use, copy, modify, 160d160211SJeremy Fitzhardinge * merge, publish, distribute, sublicense, and/or sell copies of the Software, 170d160211SJeremy Fitzhardinge * and to permit persons to whom the Software is furnished to do so, subject to 180d160211SJeremy Fitzhardinge * the following conditions: 190d160211SJeremy Fitzhardinge * 200d160211SJeremy Fitzhardinge * The above copyright notice and this permission notice shall be included in 210d160211SJeremy Fitzhardinge * all copies or substantial portions of the Software. 220d160211SJeremy Fitzhardinge * 230d160211SJeremy Fitzhardinge * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 240d160211SJeremy Fitzhardinge * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 250d160211SJeremy Fitzhardinge * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 260d160211SJeremy Fitzhardinge * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 270d160211SJeremy Fitzhardinge * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 280d160211SJeremy Fitzhardinge * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 290d160211SJeremy Fitzhardinge * IN THE SOFTWARE. 300d160211SJeremy Fitzhardinge */ 310d160211SJeremy Fitzhardinge 32383eda32SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 33383eda32SJoe Perches 340d160211SJeremy Fitzhardinge #include <linux/module.h> 350d160211SJeremy Fitzhardinge #include <linux/kernel.h> 360d160211SJeremy Fitzhardinge #include <linux/netdevice.h> 370d160211SJeremy Fitzhardinge #include <linux/etherdevice.h> 380d160211SJeremy Fitzhardinge #include <linux/skbuff.h> 390d160211SJeremy Fitzhardinge #include <linux/ethtool.h> 400d160211SJeremy Fitzhardinge #include <linux/if_ether.h> 419ecd1a75SWei Liu #include <net/tcp.h> 420d160211SJeremy Fitzhardinge #include <linux/udp.h> 430d160211SJeremy Fitzhardinge #include <linux/moduleparam.h> 440d160211SJeremy Fitzhardinge #include <linux/mm.h> 455a0e3ad6STejun Heo #include <linux/slab.h> 460d160211SJeremy Fitzhardinge #include <net/ip.h> 476c5aa6fcSDenis Kirjanov #include <linux/bpf.h> 486c5aa6fcSDenis Kirjanov #include <net/page_pool.h> 496c5aa6fcSDenis Kirjanov #include <linux/bpf_trace.h> 500d160211SJeremy Fitzhardinge 511ccbf534SJeremy Fitzhardinge #include <xen/xen.h> 520d160211SJeremy Fitzhardinge #include <xen/xenbus.h> 530d160211SJeremy Fitzhardinge #include <xen/events.h> 540d160211SJeremy Fitzhardinge #include <xen/page.h> 55b9136d20SIgor Mammedov #include <xen/platform_pci.h> 560d160211SJeremy Fitzhardinge #include <xen/grant_table.h> 570d160211SJeremy Fitzhardinge 580d160211SJeremy Fitzhardinge #include <xen/interface/io/netif.h> 590d160211SJeremy Fitzhardinge #include <xen/interface/memory.h> 600d160211SJeremy Fitzhardinge #include <xen/interface/grant_table.h> 610d160211SJeremy Fitzhardinge 6250ee6061SAndrew J. Bennieston /* Module parameters */ 63034702a6SJuergen Gross #define MAX_QUEUES_DEFAULT 8 6450ee6061SAndrew J. Bennieston static unsigned int xennet_max_queues; 6550ee6061SAndrew J. Bennieston module_param_named(max_queues, xennet_max_queues, uint, 0644); 6650ee6061SAndrew J. Bennieston MODULE_PARM_DESC(max_queues, 6750ee6061SAndrew J. Bennieston "Maximum number of queues per virtual interface"); 6850ee6061SAndrew J. Bennieston 694491001cSRoger Pau Monne static bool __read_mostly xennet_trusted = true; 704491001cSRoger Pau Monne module_param_named(trusted, xennet_trusted, bool, 0644); 714491001cSRoger Pau Monne MODULE_PARM_DESC(trusted, "Is the backend trusted"); 724491001cSRoger Pau Monne 73c2c63310SAndrea Righi #define XENNET_TIMEOUT (5 * HZ) 74c2c63310SAndrea Righi 750fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 760d160211SJeremy Fitzhardinge 770d160211SJeremy Fitzhardinge struct netfront_cb { 783683243bSIan Campbell int pull_to; 790d160211SJeremy Fitzhardinge }; 800d160211SJeremy Fitzhardinge 810d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 820d160211SJeremy Fitzhardinge 830d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 840d160211SJeremy Fitzhardinge 8530c5d7f0SJulien Grall #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) 8630c5d7f0SJulien Grall #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) 871f3c2ebaSDavid Vrabel 881f3c2ebaSDavid Vrabel /* Minimum number of Rx slots (includes slot for GSO metadata). */ 891f3c2ebaSDavid Vrabel #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) 900d160211SJeremy Fitzhardinge 912688fcb7SAndrew J. Bennieston /* Queue name is interface name with "-qNNN" appended */ 922688fcb7SAndrew J. Bennieston #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) 932688fcb7SAndrew J. Bennieston 942688fcb7SAndrew J. Bennieston /* IRQ name is queue name with "-tx" or "-rx" appended */ 952688fcb7SAndrew J. Bennieston #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) 962688fcb7SAndrew J. Bennieston 978edfe2e9SJuergen Gross static DECLARE_WAIT_QUEUE_HEAD(module_wq); 985b5971dfSEduardo Otubo 99e00f85beSstephen hemminger struct netfront_stats { 100900e1833SDavid Vrabel u64 packets; 101900e1833SDavid Vrabel u64 bytes; 102e00f85beSstephen hemminger struct u64_stats_sync syncp; 103e00f85beSstephen hemminger }; 104e00f85beSstephen hemminger 1052688fcb7SAndrew J. Bennieston struct netfront_info; 1062688fcb7SAndrew J. Bennieston 1072688fcb7SAndrew J. Bennieston struct netfront_queue { 1082688fcb7SAndrew J. Bennieston unsigned int id; /* Queue ID, 0-based */ 1092688fcb7SAndrew J. Bennieston char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ 1102688fcb7SAndrew J. Bennieston struct netfront_info *info; 1110d160211SJeremy Fitzhardinge 1126c5aa6fcSDenis Kirjanov struct bpf_prog __rcu *xdp_prog; 1136c5aa6fcSDenis Kirjanov 114bea3348eSStephen Hemminger struct napi_struct napi; 1150d160211SJeremy Fitzhardinge 116d634bf2cSWei Liu /* Split event channels support, tx_* == rx_* when using 117d634bf2cSWei Liu * single event channel. 118d634bf2cSWei Liu */ 119d634bf2cSWei Liu unsigned int tx_evtchn, rx_evtchn; 120d634bf2cSWei Liu unsigned int tx_irq, rx_irq; 121d634bf2cSWei Liu /* Only used when split event channels support is enabled */ 1222688fcb7SAndrew J. Bennieston char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ 1232688fcb7SAndrew J. Bennieston char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ 1240d160211SJeremy Fitzhardinge 1250d160211SJeremy Fitzhardinge spinlock_t tx_lock; 12684284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 12784284d3cSJeremy Fitzhardinge int tx_ring_ref; 1280d160211SJeremy Fitzhardinge 1290d160211SJeremy Fitzhardinge /* 1300d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 13121631d2dSJuergen Gross * are linked from tx_skb_freelist through tx_link. 1320d160211SJeremy Fitzhardinge */ 13321631d2dSJuergen Gross struct sk_buff *tx_skbs[NET_TX_RING_SIZE]; 13421631d2dSJuergen Gross unsigned short tx_link[NET_TX_RING_SIZE]; 13521631d2dSJuergen Gross #define TX_LINK_NONE 0xffff 136a884daa6SJuergen Gross #define TX_PENDING 0xfffe 1370d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1380d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 139cefe0078SAnnie Li struct page *grant_tx_page[NET_TX_RING_SIZE]; 1400d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 141a884daa6SJuergen Gross unsigned int tx_pend_queue; 1420d160211SJeremy Fitzhardinge 14384284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 14484284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 14584284d3cSJeremy Fitzhardinge int rx_ring_ref; 14684284d3cSJeremy Fitzhardinge 14784284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 14884284d3cSJeremy Fitzhardinge 1490d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1500d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1510d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1526c5aa6fcSDenis Kirjanov 153b27d4795SJuergen Gross unsigned int rx_rsp_unconsumed; 154b27d4795SJuergen Gross spinlock_t rx_cons_lock; 155b27d4795SJuergen Gross 1566c5aa6fcSDenis Kirjanov struct page_pool *page_pool; 1576c5aa6fcSDenis Kirjanov struct xdp_rxq_info xdp_rxq; 1582688fcb7SAndrew J. Bennieston }; 1592688fcb7SAndrew J. Bennieston 1602688fcb7SAndrew J. Bennieston struct netfront_info { 1612688fcb7SAndrew J. Bennieston struct list_head list; 1622688fcb7SAndrew J. Bennieston struct net_device *netdev; 1632688fcb7SAndrew J. Bennieston 1642688fcb7SAndrew J. Bennieston struct xenbus_device *xbdev; 1652688fcb7SAndrew J. Bennieston 1662688fcb7SAndrew J. Bennieston /* Multi-queue support */ 1672688fcb7SAndrew J. Bennieston struct netfront_queue *queues; 168e0ce4af9SIan Campbell 169e0ce4af9SIan Campbell /* Statistics */ 170900e1833SDavid Vrabel struct netfront_stats __percpu *rx_stats; 171900e1833SDavid Vrabel struct netfront_stats __percpu *tx_stats; 172e00f85beSstephen hemminger 1736c5aa6fcSDenis Kirjanov /* XDP state */ 1746c5aa6fcSDenis Kirjanov bool netback_has_xdp_headroom; 1756c5aa6fcSDenis Kirjanov bool netfront_xdp_enabled; 1766c5aa6fcSDenis Kirjanov 177a884daa6SJuergen Gross /* Is device behaving sane? */ 178a884daa6SJuergen Gross bool broken; 179a884daa6SJuergen Gross 1804491001cSRoger Pau Monne /* Should skbs be bounced into a zeroed buffer? */ 1814491001cSRoger Pau Monne bool bounce; 1824491001cSRoger Pau Monne 1832688fcb7SAndrew J. Bennieston atomic_t rx_gso_checksum_fixup; 1840d160211SJeremy Fitzhardinge }; 1850d160211SJeremy Fitzhardinge 1860d160211SJeremy Fitzhardinge struct netfront_rx_info { 1870d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1880d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1890d160211SJeremy Fitzhardinge }; 1900d160211SJeremy Fitzhardinge 1910d160211SJeremy Fitzhardinge /* 1920d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1930d160211SJeremy Fitzhardinge */ 1940d160211SJeremy Fitzhardinge 19521631d2dSJuergen Gross static void add_id_to_list(unsigned *head, unsigned short *list, 1960d160211SJeremy Fitzhardinge unsigned short id) 1970d160211SJeremy Fitzhardinge { 19821631d2dSJuergen Gross list[id] = *head; 1990d160211SJeremy Fitzhardinge *head = id; 2000d160211SJeremy Fitzhardinge } 2010d160211SJeremy Fitzhardinge 20221631d2dSJuergen Gross static unsigned short get_id_from_list(unsigned *head, unsigned short *list) 2030d160211SJeremy Fitzhardinge { 2040d160211SJeremy Fitzhardinge unsigned int id = *head; 20521631d2dSJuergen Gross 20621631d2dSJuergen Gross if (id != TX_LINK_NONE) { 20721631d2dSJuergen Gross *head = list[id]; 20821631d2dSJuergen Gross list[id] = TX_LINK_NONE; 20921631d2dSJuergen Gross } 2100d160211SJeremy Fitzhardinge return id; 2110d160211SJeremy Fitzhardinge } 2120d160211SJeremy Fitzhardinge 2130d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 2140d160211SJeremy Fitzhardinge { 2150d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 2160d160211SJeremy Fitzhardinge } 2170d160211SJeremy Fitzhardinge 2182688fcb7SAndrew J. Bennieston static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, 2190d160211SJeremy Fitzhardinge RING_IDX ri) 2200d160211SJeremy Fitzhardinge { 2210d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2222688fcb7SAndrew J. Bennieston struct sk_buff *skb = queue->rx_skbs[i]; 2232688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 2240d160211SJeremy Fitzhardinge return skb; 2250d160211SJeremy Fitzhardinge } 2260d160211SJeremy Fitzhardinge 2272688fcb7SAndrew J. Bennieston static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, 2280d160211SJeremy Fitzhardinge RING_IDX ri) 2290d160211SJeremy Fitzhardinge { 2300d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2312688fcb7SAndrew J. Bennieston grant_ref_t ref = queue->grant_rx_ref[i]; 232145daab2SJuergen Gross queue->grant_rx_ref[i] = INVALID_GRANT_REF; 2330d160211SJeremy Fitzhardinge return ref; 2340d160211SJeremy Fitzhardinge } 2350d160211SJeremy Fitzhardinge 2360d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 23727b917e5STakashi Iwai static const struct attribute_group xennet_dev_group; 2380d160211SJeremy Fitzhardinge #endif 2390d160211SJeremy Fitzhardinge 2403ad9b358SMichał Mirosław static bool xennet_can_sg(struct net_device *dev) 2410d160211SJeremy Fitzhardinge { 2423ad9b358SMichał Mirosław return dev->features & NETIF_F_SG; 2430d160211SJeremy Fitzhardinge } 2440d160211SJeremy Fitzhardinge 2450d160211SJeremy Fitzhardinge 246e99e88a9SKees Cook static void rx_refill_timeout(struct timer_list *t) 2470d160211SJeremy Fitzhardinge { 248e99e88a9SKees Cook struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer); 2492688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 2500d160211SJeremy Fitzhardinge } 2510d160211SJeremy Fitzhardinge 2522688fcb7SAndrew J. Bennieston static int netfront_tx_slot_available(struct netfront_queue *queue) 2530d160211SJeremy Fitzhardinge { 2542688fcb7SAndrew J. Bennieston return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < 25557f230abSJuergen Gross (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); 2560d160211SJeremy Fitzhardinge } 2570d160211SJeremy Fitzhardinge 2582688fcb7SAndrew J. Bennieston static void xennet_maybe_wake_tx(struct netfront_queue *queue) 2590d160211SJeremy Fitzhardinge { 2602688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 2612688fcb7SAndrew J. Bennieston struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); 2620d160211SJeremy Fitzhardinge 2632688fcb7SAndrew J. Bennieston if (unlikely(netif_tx_queue_stopped(dev_queue)) && 2642688fcb7SAndrew J. Bennieston netfront_tx_slot_available(queue) && 2650d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2662688fcb7SAndrew J. Bennieston netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); 2670d160211SJeremy Fitzhardinge } 2680d160211SJeremy Fitzhardinge 2691f3c2ebaSDavid Vrabel 2701f3c2ebaSDavid Vrabel static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) 2710d160211SJeremy Fitzhardinge { 2720d160211SJeremy Fitzhardinge struct sk_buff *skb; 2730d160211SJeremy Fitzhardinge struct page *page; 2740d160211SJeremy Fitzhardinge 2752688fcb7SAndrew J. Bennieston skb = __netdev_alloc_skb(queue->info->netdev, 2762688fcb7SAndrew J. Bennieston RX_COPY_THRESHOLD + NET_IP_ALIGN, 2770d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2780d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2791f3c2ebaSDavid Vrabel return NULL; 280617a20bbSIsaku Yamahata 281307c8de2SRoger Pau Monne page = page_pool_alloc_pages(queue->page_pool, 282307c8de2SRoger Pau Monne GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO); 2836c5aa6fcSDenis Kirjanov if (unlikely(!page)) { 2840d160211SJeremy Fitzhardinge kfree_skb(skb); 2851f3c2ebaSDavid Vrabel return NULL; 2860d160211SJeremy Fitzhardinge } 287093b9c71SJan Beulich skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); 2880d160211SJeremy Fitzhardinge 2891f3c2ebaSDavid Vrabel /* Align ip header to a 16 bytes boundary */ 2901f3c2ebaSDavid Vrabel skb_reserve(skb, NET_IP_ALIGN); 2912688fcb7SAndrew J. Bennieston skb->dev = queue->info->netdev; 2920d160211SJeremy Fitzhardinge 2931f3c2ebaSDavid Vrabel return skb; 2941f3c2ebaSDavid Vrabel } 2951f3c2ebaSDavid Vrabel 2961f3c2ebaSDavid Vrabel 2971f3c2ebaSDavid Vrabel static void xennet_alloc_rx_buffers(struct netfront_queue *queue) 2981f3c2ebaSDavid Vrabel { 2991f3c2ebaSDavid Vrabel RING_IDX req_prod = queue->rx.req_prod_pvt; 3001f3c2ebaSDavid Vrabel int notify; 301538d9291SVineeth Remanan Pillai int err = 0; 3021f3c2ebaSDavid Vrabel 3031f3c2ebaSDavid Vrabel if (unlikely(!netif_carrier_ok(queue->info->netdev))) 3041f3c2ebaSDavid Vrabel return; 3051f3c2ebaSDavid Vrabel 3061f3c2ebaSDavid Vrabel for (req_prod = queue->rx.req_prod_pvt; 3071f3c2ebaSDavid Vrabel req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; 3081f3c2ebaSDavid Vrabel req_prod++) { 3091f3c2ebaSDavid Vrabel struct sk_buff *skb; 3101f3c2ebaSDavid Vrabel unsigned short id; 3111f3c2ebaSDavid Vrabel grant_ref_t ref; 31230c5d7f0SJulien Grall struct page *page; 3131f3c2ebaSDavid Vrabel struct xen_netif_rx_request *req; 3141f3c2ebaSDavid Vrabel 3151f3c2ebaSDavid Vrabel skb = xennet_alloc_one_rx_buffer(queue); 316538d9291SVineeth Remanan Pillai if (!skb) { 317538d9291SVineeth Remanan Pillai err = -ENOMEM; 3181f3c2ebaSDavid Vrabel break; 319538d9291SVineeth Remanan Pillai } 3201f3c2ebaSDavid Vrabel 3211f3c2ebaSDavid Vrabel id = xennet_rxidx(req_prod); 3220d160211SJeremy Fitzhardinge 3232688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[id]); 3242688fcb7SAndrew J. Bennieston queue->rx_skbs[id] = skb; 3250d160211SJeremy Fitzhardinge 3262688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_rx_head); 327269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 3282688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = ref; 3290d160211SJeremy Fitzhardinge 33030c5d7f0SJulien Grall page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 3310d160211SJeremy Fitzhardinge 3321f3c2ebaSDavid Vrabel req = RING_GET_REQUEST(&queue->rx, req_prod); 33330c5d7f0SJulien Grall gnttab_page_grant_foreign_access_ref_one(ref, 3342688fcb7SAndrew J. Bennieston queue->info->xbdev->otherend_id, 33530c5d7f0SJulien Grall page, 3360d160211SJeremy Fitzhardinge 0); 3370d160211SJeremy Fitzhardinge req->id = id; 3380d160211SJeremy Fitzhardinge req->gref = ref; 3390d160211SJeremy Fitzhardinge } 3400d160211SJeremy Fitzhardinge 3411f3c2ebaSDavid Vrabel queue->rx.req_prod_pvt = req_prod; 3421f3c2ebaSDavid Vrabel 343538d9291SVineeth Remanan Pillai /* Try again later if there are not enough requests or skb allocation 344538d9291SVineeth Remanan Pillai * failed. 345538d9291SVineeth Remanan Pillai * Enough requests is quantified as the sum of newly created slots and 346538d9291SVineeth Remanan Pillai * the unconsumed slots at the backend. 347538d9291SVineeth Remanan Pillai */ 348538d9291SVineeth Remanan Pillai if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || 349538d9291SVineeth Remanan Pillai unlikely(err)) { 3501f3c2ebaSDavid Vrabel mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); 3511f3c2ebaSDavid Vrabel return; 3521f3c2ebaSDavid Vrabel } 3531f3c2ebaSDavid Vrabel 3542688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); 3550d160211SJeremy Fitzhardinge if (notify) 3562688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 3570d160211SJeremy Fitzhardinge } 3580d160211SJeremy Fitzhardinge 3590d160211SJeremy Fitzhardinge static int xennet_open(struct net_device *dev) 3600d160211SJeremy Fitzhardinge { 3610d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3622688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 3632688fcb7SAndrew J. Bennieston unsigned int i = 0; 3642688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 3650d160211SJeremy Fitzhardinge 366a884daa6SJuergen Gross if (!np->queues || np->broken) 367f599c64fSRoss Lagerwall return -ENODEV; 368f599c64fSRoss Lagerwall 3692688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 3702688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 3712688fcb7SAndrew J. Bennieston napi_enable(&queue->napi); 372bea3348eSStephen Hemminger 3732688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 3740d160211SJeremy Fitzhardinge if (netif_carrier_ok(dev)) { 3752688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 3762688fcb7SAndrew J. Bennieston queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; 3772688fcb7SAndrew J. Bennieston if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) 3782688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 3790d160211SJeremy Fitzhardinge } 3802688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 3812688fcb7SAndrew J. Bennieston } 3820d160211SJeremy Fitzhardinge 3832688fcb7SAndrew J. Bennieston netif_tx_start_all_queues(dev); 3840d160211SJeremy Fitzhardinge 3850d160211SJeremy Fitzhardinge return 0; 3860d160211SJeremy Fitzhardinge } 3870d160211SJeremy Fitzhardinge 388b27d4795SJuergen Gross static bool xennet_tx_buf_gc(struct netfront_queue *queue) 3890d160211SJeremy Fitzhardinge { 3900d160211SJeremy Fitzhardinge RING_IDX cons, prod; 3910d160211SJeremy Fitzhardinge unsigned short id; 3920d160211SJeremy Fitzhardinge struct sk_buff *skb; 3937d0105b5SMalcolm Crossley bool more_to_do; 394b27d4795SJuergen Gross bool work_done = false; 395a884daa6SJuergen Gross const struct device *dev = &queue->info->netdev->dev; 3960d160211SJeremy Fitzhardinge 3972688fcb7SAndrew J. Bennieston BUG_ON(!netif_carrier_ok(queue->info->netdev)); 3980d160211SJeremy Fitzhardinge 3990d160211SJeremy Fitzhardinge do { 4002688fcb7SAndrew J. Bennieston prod = queue->tx.sring->rsp_prod; 401a884daa6SJuergen Gross if (RING_RESPONSE_PROD_OVERFLOW(&queue->tx, prod)) { 402a884daa6SJuergen Gross dev_alert(dev, "Illegal number of responses %u\n", 403a884daa6SJuergen Gross prod - queue->tx.rsp_cons); 404a884daa6SJuergen Gross goto err; 405a884daa6SJuergen Gross } 4060d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 4070d160211SJeremy Fitzhardinge 4082688fcb7SAndrew J. Bennieston for (cons = queue->tx.rsp_cons; cons != prod; cons++) { 4098446066bSJuergen Gross struct xen_netif_tx_response txrsp; 4100d160211SJeremy Fitzhardinge 411b27d4795SJuergen Gross work_done = true; 412b27d4795SJuergen Gross 4138446066bSJuergen Gross RING_COPY_RESPONSE(&queue->tx, cons, &txrsp); 4148446066bSJuergen Gross if (txrsp.status == XEN_NETIF_RSP_NULL) 4150d160211SJeremy Fitzhardinge continue; 4160d160211SJeremy Fitzhardinge 4178446066bSJuergen Gross id = txrsp.id; 418a884daa6SJuergen Gross if (id >= RING_SIZE(&queue->tx)) { 419a884daa6SJuergen Gross dev_alert(dev, 420a884daa6SJuergen Gross "Response has incorrect id (%u)\n", 421a884daa6SJuergen Gross id); 422a884daa6SJuergen Gross goto err; 423a884daa6SJuergen Gross } 424a884daa6SJuergen Gross if (queue->tx_link[id] != TX_PENDING) { 425a884daa6SJuergen Gross dev_alert(dev, 426a884daa6SJuergen Gross "Response for inactive request\n"); 427a884daa6SJuergen Gross goto err; 428a884daa6SJuergen Gross } 429a884daa6SJuergen Gross 430a884daa6SJuergen Gross queue->tx_link[id] = TX_LINK_NONE; 43121631d2dSJuergen Gross skb = queue->tx_skbs[id]; 43221631d2dSJuergen Gross queue->tx_skbs[id] = NULL; 43331185df7SJuergen Gross if (unlikely(!gnttab_end_foreign_access_ref( 434c94b731dSJuergen Gross queue->grant_tx_ref[id]))) { 435a884daa6SJuergen Gross dev_alert(dev, 436a884daa6SJuergen Gross "Grant still in use by backend domain\n"); 437a884daa6SJuergen Gross goto err; 4380d160211SJeremy Fitzhardinge } 4390d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 4402688fcb7SAndrew J. Bennieston &queue->gref_tx_head, queue->grant_tx_ref[id]); 441145daab2SJuergen Gross queue->grant_tx_ref[id] = INVALID_GRANT_REF; 4422688fcb7SAndrew J. Bennieston queue->grant_tx_page[id] = NULL; 44321631d2dSJuergen Gross add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, id); 4440d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 4450d160211SJeremy Fitzhardinge } 4460d160211SJeremy Fitzhardinge 4472688fcb7SAndrew J. Bennieston queue->tx.rsp_cons = prod; 4480d160211SJeremy Fitzhardinge 4497d0105b5SMalcolm Crossley RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); 4507d0105b5SMalcolm Crossley } while (more_to_do); 4510d160211SJeremy Fitzhardinge 4522688fcb7SAndrew J. Bennieston xennet_maybe_wake_tx(queue); 453a884daa6SJuergen Gross 454b27d4795SJuergen Gross return work_done; 455a884daa6SJuergen Gross 456a884daa6SJuergen Gross err: 457a884daa6SJuergen Gross queue->info->broken = true; 458a884daa6SJuergen Gross dev_alert(dev, "Disabled for further use\n"); 459b27d4795SJuergen Gross 460b27d4795SJuergen Gross return work_done; 4610d160211SJeremy Fitzhardinge } 4620d160211SJeremy Fitzhardinge 46330c5d7f0SJulien Grall struct xennet_gnttab_make_txreq { 46430c5d7f0SJulien Grall struct netfront_queue *queue; 46530c5d7f0SJulien Grall struct sk_buff *skb; 46630c5d7f0SJulien Grall struct page *page; 467162081ecSJuergen Gross struct xen_netif_tx_request *tx; /* Last request on ring page */ 468162081ecSJuergen Gross struct xen_netif_tx_request tx_local; /* Last request local copy*/ 46930c5d7f0SJulien Grall unsigned int size; 47030c5d7f0SJulien Grall }; 47130c5d7f0SJulien Grall 47230c5d7f0SJulien Grall static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, 47330c5d7f0SJulien Grall unsigned int len, void *data) 4740d160211SJeremy Fitzhardinge { 47530c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 4760d160211SJeremy Fitzhardinge unsigned int id; 477a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx; 4780d160211SJeremy Fitzhardinge grant_ref_t ref; 47930c5d7f0SJulien Grall /* convenient aliases */ 48030c5d7f0SJulien Grall struct page *page = info->page; 48130c5d7f0SJulien Grall struct netfront_queue *queue = info->queue; 48230c5d7f0SJulien Grall struct sk_buff *skb = info->skb; 4830d160211SJeremy Fitzhardinge 48421631d2dSJuergen Gross id = get_id_from_list(&queue->tx_skb_freelist, queue->tx_link); 485a55e8bb8SDavid Vrabel tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 4862688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_tx_head); 487269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 4880d160211SJeremy Fitzhardinge 48930c5d7f0SJulien Grall gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, 49030c5d7f0SJulien Grall gfn, GNTMAP_readonly); 4910d160211SJeremy Fitzhardinge 49221631d2dSJuergen Gross queue->tx_skbs[id] = skb; 493a55e8bb8SDavid Vrabel queue->grant_tx_page[id] = page; 494a55e8bb8SDavid Vrabel queue->grant_tx_ref[id] = ref; 495a55e8bb8SDavid Vrabel 496162081ecSJuergen Gross info->tx_local.id = id; 497162081ecSJuergen Gross info->tx_local.gref = ref; 498162081ecSJuergen Gross info->tx_local.offset = offset; 499162081ecSJuergen Gross info->tx_local.size = len; 500162081ecSJuergen Gross info->tx_local.flags = 0; 501162081ecSJuergen Gross 502162081ecSJuergen Gross *tx = info->tx_local; 503a55e8bb8SDavid Vrabel 504a884daa6SJuergen Gross /* 505a884daa6SJuergen Gross * Put the request in the pending queue, it will be set to be pending 506a884daa6SJuergen Gross * when the producer index is about to be raised. 507a884daa6SJuergen Gross */ 508a884daa6SJuergen Gross add_id_to_list(&queue->tx_pend_queue, queue->tx_link, id); 509a884daa6SJuergen Gross 51030c5d7f0SJulien Grall info->tx = tx; 511162081ecSJuergen Gross info->size += info->tx_local.size; 51230c5d7f0SJulien Grall } 51330c5d7f0SJulien Grall 51430c5d7f0SJulien Grall static struct xen_netif_tx_request *xennet_make_first_txreq( 515162081ecSJuergen Gross struct xennet_gnttab_make_txreq *info, 516162081ecSJuergen Gross unsigned int offset, unsigned int len) 51730c5d7f0SJulien Grall { 518162081ecSJuergen Gross info->size = 0; 51930c5d7f0SJulien Grall 520162081ecSJuergen Gross gnttab_for_one_grant(info->page, offset, len, xennet_tx_setup_grant, info); 52130c5d7f0SJulien Grall 522162081ecSJuergen Gross return info->tx; 52330c5d7f0SJulien Grall } 52430c5d7f0SJulien Grall 52530c5d7f0SJulien Grall static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, 52630c5d7f0SJulien Grall unsigned int len, void *data) 52730c5d7f0SJulien Grall { 52830c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 52930c5d7f0SJulien Grall 53030c5d7f0SJulien Grall info->tx->flags |= XEN_NETTXF_more_data; 53130c5d7f0SJulien Grall skb_get(info->skb); 53230c5d7f0SJulien Grall xennet_tx_setup_grant(gfn, offset, len, data); 5330d160211SJeremy Fitzhardinge } 5340d160211SJeremy Fitzhardinge 535162081ecSJuergen Gross static void xennet_make_txreqs( 536162081ecSJuergen Gross struct xennet_gnttab_make_txreq *info, 537162081ecSJuergen Gross struct page *page, 538a55e8bb8SDavid Vrabel unsigned int offset, unsigned int len) 539a55e8bb8SDavid Vrabel { 540f36c3747SIan Campbell /* Skip unused frames from start of page */ 541f36c3747SIan Campbell page += offset >> PAGE_SHIFT; 542f36c3747SIan Campbell offset &= ~PAGE_MASK; 543f36c3747SIan Campbell 544a55e8bb8SDavid Vrabel while (len) { 545162081ecSJuergen Gross info->page = page; 546162081ecSJuergen Gross info->size = 0; 54730c5d7f0SJulien Grall 54830c5d7f0SJulien Grall gnttab_foreach_grant_in_range(page, offset, len, 54930c5d7f0SJulien Grall xennet_make_one_txreq, 550162081ecSJuergen Gross info); 55130c5d7f0SJulien Grall 552f36c3747SIan Campbell page++; 553f36c3747SIan Campbell offset = 0; 554162081ecSJuergen Gross len -= info->size; 5550d160211SJeremy Fitzhardinge } 5560d160211SJeremy Fitzhardinge } 5570d160211SJeremy Fitzhardinge 558f36c3747SIan Campbell /* 559e84448d5SDavid Vrabel * Count how many ring slots are required to send this skb. Each frag 560e84448d5SDavid Vrabel * might be a compound page. 561f36c3747SIan Campbell */ 562e84448d5SDavid Vrabel static int xennet_count_skb_slots(struct sk_buff *skb) 563f36c3747SIan Campbell { 564f36c3747SIan Campbell int i, frags = skb_shinfo(skb)->nr_frags; 56530c5d7f0SJulien Grall int slots; 566e84448d5SDavid Vrabel 56730c5d7f0SJulien Grall slots = gnttab_count_grant(offset_in_page(skb->data), 56830c5d7f0SJulien Grall skb_headlen(skb)); 569f36c3747SIan Campbell 570f36c3747SIan Campbell for (i = 0; i < frags; i++) { 571f36c3747SIan Campbell skb_frag_t *frag = skb_shinfo(skb)->frags + i; 572f36c3747SIan Campbell unsigned long size = skb_frag_size(frag); 573b54c9d5bSJonathan Lemon unsigned long offset = skb_frag_off(frag); 574f36c3747SIan Campbell 575f36c3747SIan Campbell /* Skip unused frames from start of page */ 576f36c3747SIan Campbell offset &= ~PAGE_MASK; 577f36c3747SIan Campbell 57830c5d7f0SJulien Grall slots += gnttab_count_grant(offset, size); 579f36c3747SIan Campbell } 580f36c3747SIan Campbell 58130c5d7f0SJulien Grall return slots; 582f36c3747SIan Campbell } 583f36c3747SIan Campbell 58450ee6061SAndrew J. Bennieston static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, 585a350ecceSPaolo Abeni struct net_device *sb_dev) 5862688fcb7SAndrew J. Bennieston { 58750ee6061SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 58850ee6061SAndrew J. Bennieston u32 hash; 58950ee6061SAndrew J. Bennieston u16 queue_idx; 59050ee6061SAndrew J. Bennieston 59150ee6061SAndrew J. Bennieston /* First, check if there is only one queue */ 59250ee6061SAndrew J. Bennieston if (num_queues == 1) { 59350ee6061SAndrew J. Bennieston queue_idx = 0; 59450ee6061SAndrew J. Bennieston } else { 59550ee6061SAndrew J. Bennieston hash = skb_get_hash(skb); 59650ee6061SAndrew J. Bennieston queue_idx = hash % num_queues; 59750ee6061SAndrew J. Bennieston } 59850ee6061SAndrew J. Bennieston 59950ee6061SAndrew J. Bennieston return queue_idx; 6002688fcb7SAndrew J. Bennieston } 6012688fcb7SAndrew J. Bennieston 602a884daa6SJuergen Gross static void xennet_mark_tx_pending(struct netfront_queue *queue) 603a884daa6SJuergen Gross { 604a884daa6SJuergen Gross unsigned int i; 605a884daa6SJuergen Gross 606a884daa6SJuergen Gross while ((i = get_id_from_list(&queue->tx_pend_queue, queue->tx_link)) != 607a884daa6SJuergen Gross TX_LINK_NONE) 608a884daa6SJuergen Gross queue->tx_link[i] = TX_PENDING; 609a884daa6SJuergen Gross } 610a884daa6SJuergen Gross 6116c5aa6fcSDenis Kirjanov static int xennet_xdp_xmit_one(struct net_device *dev, 6126c5aa6fcSDenis Kirjanov struct netfront_queue *queue, 6136c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf) 6146c5aa6fcSDenis Kirjanov { 6156c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 6166c5aa6fcSDenis Kirjanov struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 617162081ecSJuergen Gross struct xennet_gnttab_make_txreq info = { 618162081ecSJuergen Gross .queue = queue, 619162081ecSJuergen Gross .skb = NULL, 620162081ecSJuergen Gross .page = virt_to_page(xdpf->data), 621162081ecSJuergen Gross }; 6226c5aa6fcSDenis Kirjanov int notify; 6236c5aa6fcSDenis Kirjanov 624162081ecSJuergen Gross xennet_make_first_txreq(&info, 6256c5aa6fcSDenis Kirjanov offset_in_page(xdpf->data), 6266c5aa6fcSDenis Kirjanov xdpf->len); 6276c5aa6fcSDenis Kirjanov 628a884daa6SJuergen Gross xennet_mark_tx_pending(queue); 629a884daa6SJuergen Gross 6306c5aa6fcSDenis Kirjanov RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 6316c5aa6fcSDenis Kirjanov if (notify) 6326c5aa6fcSDenis Kirjanov notify_remote_via_irq(queue->tx_irq); 6336c5aa6fcSDenis Kirjanov 6346c5aa6fcSDenis Kirjanov u64_stats_update_begin(&tx_stats->syncp); 6356c5aa6fcSDenis Kirjanov tx_stats->bytes += xdpf->len; 6366c5aa6fcSDenis Kirjanov tx_stats->packets++; 6376c5aa6fcSDenis Kirjanov u64_stats_update_end(&tx_stats->syncp); 6386c5aa6fcSDenis Kirjanov 6396c5aa6fcSDenis Kirjanov xennet_tx_buf_gc(queue); 6406c5aa6fcSDenis Kirjanov 6416c5aa6fcSDenis Kirjanov return 0; 6426c5aa6fcSDenis Kirjanov } 6436c5aa6fcSDenis Kirjanov 6446c5aa6fcSDenis Kirjanov static int xennet_xdp_xmit(struct net_device *dev, int n, 6456c5aa6fcSDenis Kirjanov struct xdp_frame **frames, u32 flags) 6466c5aa6fcSDenis Kirjanov { 6476c5aa6fcSDenis Kirjanov unsigned int num_queues = dev->real_num_tx_queues; 6486c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 6496c5aa6fcSDenis Kirjanov struct netfront_queue *queue = NULL; 6506c5aa6fcSDenis Kirjanov unsigned long irq_flags; 651fdc13979SLorenzo Bianconi int nxmit = 0; 652fdc13979SLorenzo Bianconi int i; 6536c5aa6fcSDenis Kirjanov 654a884daa6SJuergen Gross if (unlikely(np->broken)) 655a884daa6SJuergen Gross return -ENODEV; 6566c5aa6fcSDenis Kirjanov if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 6576c5aa6fcSDenis Kirjanov return -EINVAL; 6586c5aa6fcSDenis Kirjanov 6596c5aa6fcSDenis Kirjanov queue = &np->queues[smp_processor_id() % num_queues]; 6606c5aa6fcSDenis Kirjanov 6616c5aa6fcSDenis Kirjanov spin_lock_irqsave(&queue->tx_lock, irq_flags); 6626c5aa6fcSDenis Kirjanov for (i = 0; i < n; i++) { 6636c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf = frames[i]; 6646c5aa6fcSDenis Kirjanov 6656c5aa6fcSDenis Kirjanov if (!xdpf) 6666c5aa6fcSDenis Kirjanov continue; 667fdc13979SLorenzo Bianconi if (xennet_xdp_xmit_one(dev, queue, xdpf)) 668fdc13979SLorenzo Bianconi break; 669fdc13979SLorenzo Bianconi nxmit++; 6706c5aa6fcSDenis Kirjanov } 6716c5aa6fcSDenis Kirjanov spin_unlock_irqrestore(&queue->tx_lock, irq_flags); 6726c5aa6fcSDenis Kirjanov 673fdc13979SLorenzo Bianconi return nxmit; 6746c5aa6fcSDenis Kirjanov } 6756c5aa6fcSDenis Kirjanov 67653ff2517Sruanjinjie static struct sk_buff *bounce_skb(const struct sk_buff *skb) 6774491001cSRoger Pau Monne { 6784491001cSRoger Pau Monne unsigned int headerlen = skb_headroom(skb); 6794491001cSRoger Pau Monne /* Align size to allocate full pages and avoid contiguous data leaks */ 6804491001cSRoger Pau Monne unsigned int size = ALIGN(skb_end_offset(skb) + skb->data_len, 6814491001cSRoger Pau Monne XEN_PAGE_SIZE); 6824491001cSRoger Pau Monne struct sk_buff *n = alloc_skb(size, GFP_ATOMIC | __GFP_ZERO); 6834491001cSRoger Pau Monne 6844491001cSRoger Pau Monne if (!n) 6854491001cSRoger Pau Monne return NULL; 6864491001cSRoger Pau Monne 6874491001cSRoger Pau Monne if (!IS_ALIGNED((uintptr_t)n->head, XEN_PAGE_SIZE)) { 6884491001cSRoger Pau Monne WARN_ONCE(1, "misaligned skb allocated\n"); 6894491001cSRoger Pau Monne kfree_skb(n); 6904491001cSRoger Pau Monne return NULL; 6914491001cSRoger Pau Monne } 6924491001cSRoger Pau Monne 6934491001cSRoger Pau Monne /* Set the data pointer */ 6944491001cSRoger Pau Monne skb_reserve(n, headerlen); 6954491001cSRoger Pau Monne /* Set the tail pointer and length */ 6964491001cSRoger Pau Monne skb_put(n, skb->len); 6974491001cSRoger Pau Monne 6984491001cSRoger Pau Monne BUG_ON(skb_copy_bits(skb, -headerlen, n->head, headerlen + skb->len)); 6994491001cSRoger Pau Monne 7004491001cSRoger Pau Monne skb_copy_header(n, skb); 7014491001cSRoger Pau Monne return n; 7024491001cSRoger Pau Monne } 7036c5aa6fcSDenis Kirjanov 70430c5d7f0SJulien Grall #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) 70530c5d7f0SJulien Grall 70624a94b3cSLuc Van Oostenryck static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 7070d160211SJeremy Fitzhardinge { 7080d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 709900e1833SDavid Vrabel struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 710162081ecSJuergen Gross struct xen_netif_tx_request *first_tx; 711a55e8bb8SDavid Vrabel unsigned int i; 7120d160211SJeremy Fitzhardinge int notify; 713f36c3747SIan Campbell int slots; 714a55e8bb8SDavid Vrabel struct page *page; 715a55e8bb8SDavid Vrabel unsigned int offset; 716a55e8bb8SDavid Vrabel unsigned int len; 717cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 7182688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 719162081ecSJuergen Gross struct xennet_gnttab_make_txreq info = { }; 7202688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 7212688fcb7SAndrew J. Bennieston u16 queue_index; 722fd07160bSVitaly Kuznetsov struct sk_buff *nskb; 7232688fcb7SAndrew J. Bennieston 7242688fcb7SAndrew J. Bennieston /* Drop the packet if no queues are set up */ 7252688fcb7SAndrew J. Bennieston if (num_queues < 1) 7262688fcb7SAndrew J. Bennieston goto drop; 727a884daa6SJuergen Gross if (unlikely(np->broken)) 728a884daa6SJuergen Gross goto drop; 7292688fcb7SAndrew J. Bennieston /* Determine which queue to transmit this SKB on */ 7302688fcb7SAndrew J. Bennieston queue_index = skb_get_queue_mapping(skb); 7312688fcb7SAndrew J. Bennieston queue = &np->queues[queue_index]; 7320d160211SJeremy Fitzhardinge 7339ecd1a75SWei Liu /* If skb->len is too big for wire format, drop skb and alert 7349ecd1a75SWei Liu * user about misconfiguration. 7359ecd1a75SWei Liu */ 7369ecd1a75SWei Liu if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { 7379ecd1a75SWei Liu net_alert_ratelimited( 7389ecd1a75SWei Liu "xennet: skb->len = %u, too big for wire format\n", 7399ecd1a75SWei Liu skb->len); 7409ecd1a75SWei Liu goto drop; 7419ecd1a75SWei Liu } 7429ecd1a75SWei Liu 743e84448d5SDavid Vrabel slots = xennet_count_skb_slots(skb); 74430c5d7f0SJulien Grall if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { 74597a6d1bbSZoltan Kiss net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", 74697a6d1bbSZoltan Kiss slots, skb->len); 74797a6d1bbSZoltan Kiss if (skb_linearize(skb)) 7480d160211SJeremy Fitzhardinge goto drop; 7490d160211SJeremy Fitzhardinge } 7500d160211SJeremy Fitzhardinge 751a55e8bb8SDavid Vrabel page = virt_to_page(skb->data); 752a55e8bb8SDavid Vrabel offset = offset_in_page(skb->data); 753fd07160bSVitaly Kuznetsov 754fd07160bSVitaly Kuznetsov /* The first req should be at least ETH_HLEN size or the packet will be 755fd07160bSVitaly Kuznetsov * dropped by netback. 7564491001cSRoger Pau Monne * 7574491001cSRoger Pau Monne * If the backend is not trusted bounce all data to zeroed pages to 7584491001cSRoger Pau Monne * avoid exposing contiguous data on the granted page not belonging to 7594491001cSRoger Pau Monne * the skb. 760fd07160bSVitaly Kuznetsov */ 7614491001cSRoger Pau Monne if (np->bounce || unlikely(PAGE_SIZE - offset < ETH_HLEN)) { 7624491001cSRoger Pau Monne nskb = bounce_skb(skb); 763fd07160bSVitaly Kuznetsov if (!nskb) 764fd07160bSVitaly Kuznetsov goto drop; 76562f3250fSEric Dumazet dev_consume_skb_any(skb); 766fd07160bSVitaly Kuznetsov skb = nskb; 767fd07160bSVitaly Kuznetsov page = virt_to_page(skb->data); 768fd07160bSVitaly Kuznetsov offset = offset_in_page(skb->data); 769fd07160bSVitaly Kuznetsov } 770fd07160bSVitaly Kuznetsov 771a55e8bb8SDavid Vrabel len = skb_headlen(skb); 772a55e8bb8SDavid Vrabel 7732688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 7740d160211SJeremy Fitzhardinge 7750d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 776f36c3747SIan Campbell (slots > 1 && !xennet_can_sg(dev)) || 7778b86a61dSJohannes Berg netif_needs_gso(skb, netif_skb_features(skb)))) { 7782688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 7790d160211SJeremy Fitzhardinge goto drop; 7800d160211SJeremy Fitzhardinge } 7810d160211SJeremy Fitzhardinge 782a55e8bb8SDavid Vrabel /* First request for the linear area. */ 783162081ecSJuergen Gross info.queue = queue; 784162081ecSJuergen Gross info.skb = skb; 785162081ecSJuergen Gross info.page = page; 786162081ecSJuergen Gross first_tx = xennet_make_first_txreq(&info, offset, len); 787162081ecSJuergen Gross offset += info.tx_local.size; 78830c5d7f0SJulien Grall if (offset == PAGE_SIZE) { 789a55e8bb8SDavid Vrabel page++; 790a55e8bb8SDavid Vrabel offset = 0; 79130c5d7f0SJulien Grall } 792162081ecSJuergen Gross len -= info.tx_local.size; 7930d160211SJeremy Fitzhardinge 7940d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 7950d160211SJeremy Fitzhardinge /* local packet? */ 796162081ecSJuergen Gross first_tx->flags |= XEN_NETTXF_csum_blank | 797162081ecSJuergen Gross XEN_NETTXF_data_validated; 7980d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 7990d160211SJeremy Fitzhardinge /* remote but checksummed. */ 800162081ecSJuergen Gross first_tx->flags |= XEN_NETTXF_data_validated; 8010d160211SJeremy Fitzhardinge 802a55e8bb8SDavid Vrabel /* Optional extra info after the first request. */ 8030d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 8040d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 8050d160211SJeremy Fitzhardinge 8060d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 807a55e8bb8SDavid Vrabel RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 8080d160211SJeremy Fitzhardinge 809162081ecSJuergen Gross first_tx->flags |= XEN_NETTXF_extra_info; 8100d160211SJeremy Fitzhardinge 8110d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 8122c0057deSPaul Durrant gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? 8132c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV6 : 8142c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV4; 8150d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 8160d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 8170d160211SJeremy Fitzhardinge 8180d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 8190d160211SJeremy Fitzhardinge gso->flags = 0; 8200d160211SJeremy Fitzhardinge } 8210d160211SJeremy Fitzhardinge 822a55e8bb8SDavid Vrabel /* Requests for the rest of the linear area. */ 823162081ecSJuergen Gross xennet_make_txreqs(&info, page, offset, len); 8240d160211SJeremy Fitzhardinge 825a55e8bb8SDavid Vrabel /* Requests for all the frags. */ 826a55e8bb8SDavid Vrabel for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 827a55e8bb8SDavid Vrabel skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 828162081ecSJuergen Gross xennet_make_txreqs(&info, skb_frag_page(frag), 829b54c9d5bSJonathan Lemon skb_frag_off(frag), 830a55e8bb8SDavid Vrabel skb_frag_size(frag)); 831a55e8bb8SDavid Vrabel } 832a55e8bb8SDavid Vrabel 833a55e8bb8SDavid Vrabel /* First request has the packet length. */ 834a55e8bb8SDavid Vrabel first_tx->size = skb->len; 8350d160211SJeremy Fitzhardinge 83691ffb9d3SDaniel Drown /* timestamp packet in software */ 83791ffb9d3SDaniel Drown skb_tx_timestamp(skb); 83891ffb9d3SDaniel Drown 839a884daa6SJuergen Gross xennet_mark_tx_pending(queue); 840a884daa6SJuergen Gross 8412688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 8420d160211SJeremy Fitzhardinge if (notify) 8432688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 8440d160211SJeremy Fitzhardinge 845900e1833SDavid Vrabel u64_stats_update_begin(&tx_stats->syncp); 846900e1833SDavid Vrabel tx_stats->bytes += skb->len; 847900e1833SDavid Vrabel tx_stats->packets++; 848900e1833SDavid Vrabel u64_stats_update_end(&tx_stats->syncp); 84910a273a6SJeremy Fitzhardinge 85010a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 8512688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 8520d160211SJeremy Fitzhardinge 8532688fcb7SAndrew J. Bennieston if (!netfront_tx_slot_available(queue)) 8542688fcb7SAndrew J. Bennieston netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); 8550d160211SJeremy Fitzhardinge 8562688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 8570d160211SJeremy Fitzhardinge 8586ed10654SPatrick McHardy return NETDEV_TX_OK; 8590d160211SJeremy Fitzhardinge 8600d160211SJeremy Fitzhardinge drop: 86109f75cd7SJeff Garzik dev->stats.tx_dropped++; 862979de8a0SEric W. Biederman dev_kfree_skb_any(skb); 8636ed10654SPatrick McHardy return NETDEV_TX_OK; 8640d160211SJeremy Fitzhardinge } 8650d160211SJeremy Fitzhardinge 8660d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 8670d160211SJeremy Fitzhardinge { 8680d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 8692688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 8702688fcb7SAndrew J. Bennieston unsigned int i; 8712688fcb7SAndrew J. Bennieston struct netfront_queue *queue; 8722688fcb7SAndrew J. Bennieston netif_tx_stop_all_queues(np->netdev); 8732688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 8742688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 8752688fcb7SAndrew J. Bennieston napi_disable(&queue->napi); 8762688fcb7SAndrew J. Bennieston } 8770d160211SJeremy Fitzhardinge return 0; 8780d160211SJeremy Fitzhardinge } 8790d160211SJeremy Fitzhardinge 880dcf4ff7aSMarek Marczykowski-Górecki static void xennet_destroy_queues(struct netfront_info *info) 881dcf4ff7aSMarek Marczykowski-Górecki { 882dcf4ff7aSMarek Marczykowski-Górecki unsigned int i; 883dcf4ff7aSMarek Marczykowski-Górecki 884dcf4ff7aSMarek Marczykowski-Górecki for (i = 0; i < info->netdev->real_num_tx_queues; i++) { 885dcf4ff7aSMarek Marczykowski-Górecki struct netfront_queue *queue = &info->queues[i]; 886dcf4ff7aSMarek Marczykowski-Górecki 887dcf4ff7aSMarek Marczykowski-Górecki if (netif_running(info->netdev)) 888dcf4ff7aSMarek Marczykowski-Górecki napi_disable(&queue->napi); 889dcf4ff7aSMarek Marczykowski-Górecki netif_napi_del(&queue->napi); 890dcf4ff7aSMarek Marczykowski-Górecki } 891dcf4ff7aSMarek Marczykowski-Górecki 892dcf4ff7aSMarek Marczykowski-Górecki kfree(info->queues); 893dcf4ff7aSMarek Marczykowski-Górecki info->queues = NULL; 894dcf4ff7aSMarek Marczykowski-Górecki } 895dcf4ff7aSMarek Marczykowski-Górecki 896dcf4ff7aSMarek Marczykowski-Górecki static void xennet_uninit(struct net_device *dev) 897dcf4ff7aSMarek Marczykowski-Górecki { 898dcf4ff7aSMarek Marczykowski-Górecki struct netfront_info *np = netdev_priv(dev); 899dcf4ff7aSMarek Marczykowski-Górecki xennet_destroy_queues(np); 900dcf4ff7aSMarek Marczykowski-Górecki } 901dcf4ff7aSMarek Marczykowski-Górecki 902b27d4795SJuergen Gross static void xennet_set_rx_rsp_cons(struct netfront_queue *queue, RING_IDX val) 903b27d4795SJuergen Gross { 904b27d4795SJuergen Gross unsigned long flags; 905b27d4795SJuergen Gross 906b27d4795SJuergen Gross spin_lock_irqsave(&queue->rx_cons_lock, flags); 907b27d4795SJuergen Gross queue->rx.rsp_cons = val; 9086fac592cSJuergen Gross queue->rx_rsp_unconsumed = XEN_RING_NR_UNCONSUMED_RESPONSES(&queue->rx); 909b27d4795SJuergen Gross spin_unlock_irqrestore(&queue->rx_cons_lock, flags); 910b27d4795SJuergen Gross } 911b27d4795SJuergen Gross 9122688fcb7SAndrew J. Bennieston static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, 9130d160211SJeremy Fitzhardinge grant_ref_t ref) 9140d160211SJeremy Fitzhardinge { 9152688fcb7SAndrew J. Bennieston int new = xennet_rxidx(queue->rx.req_prod_pvt); 9160d160211SJeremy Fitzhardinge 9172688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[new]); 9182688fcb7SAndrew J. Bennieston queue->rx_skbs[new] = skb; 9192688fcb7SAndrew J. Bennieston queue->grant_rx_ref[new] = ref; 9202688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; 9212688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; 9222688fcb7SAndrew J. Bennieston queue->rx.req_prod_pvt++; 9230d160211SJeremy Fitzhardinge } 9240d160211SJeremy Fitzhardinge 9252688fcb7SAndrew J. Bennieston static int xennet_get_extras(struct netfront_queue *queue, 9260d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 9270d160211SJeremy Fitzhardinge RING_IDX rp) 9280d160211SJeremy Fitzhardinge 9290d160211SJeremy Fitzhardinge { 9308446066bSJuergen Gross struct xen_netif_extra_info extra; 9312688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 9322688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 9330d160211SJeremy Fitzhardinge int err = 0; 9340d160211SJeremy Fitzhardinge 9350d160211SJeremy Fitzhardinge do { 9360d160211SJeremy Fitzhardinge struct sk_buff *skb; 9370d160211SJeremy Fitzhardinge grant_ref_t ref; 9380d160211SJeremy Fitzhardinge 9390d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 9400d160211SJeremy Fitzhardinge if (net_ratelimit()) 9410d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 9420d160211SJeremy Fitzhardinge err = -EBADR; 9430d160211SJeremy Fitzhardinge break; 9440d160211SJeremy Fitzhardinge } 9450d160211SJeremy Fitzhardinge 9468446066bSJuergen Gross RING_COPY_RESPONSE(&queue->rx, ++cons, &extra); 9470d160211SJeremy Fitzhardinge 9488446066bSJuergen Gross if (unlikely(!extra.type || 9498446066bSJuergen Gross extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 9500d160211SJeremy Fitzhardinge if (net_ratelimit()) 9510d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 9528446066bSJuergen Gross extra.type); 9530d160211SJeremy Fitzhardinge err = -EINVAL; 9540d160211SJeremy Fitzhardinge } else { 9558446066bSJuergen Gross extras[extra.type - 1] = extra; 9560d160211SJeremy Fitzhardinge } 9570d160211SJeremy Fitzhardinge 9582688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons); 9592688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons); 9602688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 9618446066bSJuergen Gross } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); 9620d160211SJeremy Fitzhardinge 963b27d4795SJuergen Gross xennet_set_rx_rsp_cons(queue, cons); 9640d160211SJeremy Fitzhardinge return err; 9650d160211SJeremy Fitzhardinge } 9660d160211SJeremy Fitzhardinge 9676c5aa6fcSDenis Kirjanov static u32 xennet_run_xdp(struct netfront_queue *queue, struct page *pdata, 9686c5aa6fcSDenis Kirjanov struct xen_netif_rx_response *rx, struct bpf_prog *prog, 9696c5aa6fcSDenis Kirjanov struct xdp_buff *xdp, bool *need_xdp_flush) 9706c5aa6fcSDenis Kirjanov { 9716c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf; 9726c5aa6fcSDenis Kirjanov u32 len = rx->status; 973e44f65fdSColin Ian King u32 act; 9746c5aa6fcSDenis Kirjanov int err; 9756c5aa6fcSDenis Kirjanov 97643b5169dSLorenzo Bianconi xdp_init_buff(xdp, XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, 97743b5169dSLorenzo Bianconi &queue->xdp_rxq); 978be9df4afSLorenzo Bianconi xdp_prepare_buff(xdp, page_address(pdata), XDP_PACKET_HEADROOM, 979be9df4afSLorenzo Bianconi len, false); 9806c5aa6fcSDenis Kirjanov 9816c5aa6fcSDenis Kirjanov act = bpf_prog_run_xdp(prog, xdp); 9826c5aa6fcSDenis Kirjanov switch (act) { 9836c5aa6fcSDenis Kirjanov case XDP_TX: 9846c5aa6fcSDenis Kirjanov get_page(pdata); 9856c5aa6fcSDenis Kirjanov xdpf = xdp_convert_buff_to_frame(xdp); 9866c5aa6fcSDenis Kirjanov err = xennet_xdp_xmit(queue->info->netdev, 1, &xdpf, 0); 987fdc13979SLorenzo Bianconi if (unlikely(!err)) 988fdc13979SLorenzo Bianconi xdp_return_frame_rx_napi(xdpf); 989fdc13979SLorenzo Bianconi else if (unlikely(err < 0)) 9906c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 9916c5aa6fcSDenis Kirjanov break; 9926c5aa6fcSDenis Kirjanov case XDP_REDIRECT: 9936c5aa6fcSDenis Kirjanov get_page(pdata); 9946c5aa6fcSDenis Kirjanov err = xdp_do_redirect(queue->info->netdev, xdp, prog); 9956c5aa6fcSDenis Kirjanov *need_xdp_flush = true; 9966c5aa6fcSDenis Kirjanov if (unlikely(err)) 9976c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 9986c5aa6fcSDenis Kirjanov break; 9996c5aa6fcSDenis Kirjanov case XDP_PASS: 10006c5aa6fcSDenis Kirjanov case XDP_DROP: 10016c5aa6fcSDenis Kirjanov break; 10026c5aa6fcSDenis Kirjanov 10036c5aa6fcSDenis Kirjanov case XDP_ABORTED: 10046c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 10056c5aa6fcSDenis Kirjanov break; 10066c5aa6fcSDenis Kirjanov 10076c5aa6fcSDenis Kirjanov default: 1008c8064e5bSPaolo Abeni bpf_warn_invalid_xdp_action(queue->info->netdev, prog, act); 10096c5aa6fcSDenis Kirjanov } 10106c5aa6fcSDenis Kirjanov 10116c5aa6fcSDenis Kirjanov return act; 10126c5aa6fcSDenis Kirjanov } 10136c5aa6fcSDenis Kirjanov 10142688fcb7SAndrew J. Bennieston static int xennet_get_responses(struct netfront_queue *queue, 10150d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 10166c5aa6fcSDenis Kirjanov struct sk_buff_head *list, 10176c5aa6fcSDenis Kirjanov bool *need_xdp_flush) 10180d160211SJeremy Fitzhardinge { 10198446066bSJuergen Gross struct xen_netif_rx_response *rx = &rinfo->rx, rx_local; 10206c5aa6fcSDenis Kirjanov int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); 10212688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 10222688fcb7SAndrew J. Bennieston struct sk_buff *skb = xennet_get_rx_skb(queue, cons); 10236c5aa6fcSDenis Kirjanov struct xen_netif_extra_info *extras = rinfo->extras; 10242688fcb7SAndrew J. Bennieston grant_ref_t ref = xennet_get_rx_ref(queue, cons); 10256c5aa6fcSDenis Kirjanov struct device *dev = &queue->info->netdev->dev; 10266c5aa6fcSDenis Kirjanov struct bpf_prog *xdp_prog; 10276c5aa6fcSDenis Kirjanov struct xdp_buff xdp; 10287158ff6dSWei Liu int slots = 1; 10290d160211SJeremy Fitzhardinge int err = 0; 10306c5aa6fcSDenis Kirjanov u32 verdict; 10310d160211SJeremy Fitzhardinge 1032f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_extra_info) { 10332688fcb7SAndrew J. Bennieston err = xennet_get_extras(queue, extras, rp); 10346c5aa6fcSDenis Kirjanov if (!err) { 10356c5aa6fcSDenis Kirjanov if (extras[XEN_NETIF_EXTRA_TYPE_XDP - 1].type) { 10366c5aa6fcSDenis Kirjanov struct xen_netif_extra_info *xdp; 10376c5aa6fcSDenis Kirjanov 10386c5aa6fcSDenis Kirjanov xdp = &extras[XEN_NETIF_EXTRA_TYPE_XDP - 1]; 10396c5aa6fcSDenis Kirjanov rx->offset = xdp->u.xdp.headroom; 10406c5aa6fcSDenis Kirjanov } 10416c5aa6fcSDenis Kirjanov } 10422688fcb7SAndrew J. Bennieston cons = queue->rx.rsp_cons; 10430d160211SJeremy Fitzhardinge } 10440d160211SJeremy Fitzhardinge 10450d160211SJeremy Fitzhardinge for (;;) { 10460d160211SJeremy Fitzhardinge /* 10470d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 10480d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 1049697089dcSWei Liu * situation to the system controller to reboot the backend. 10500d160211SJeremy Fitzhardinge */ 1051145daab2SJuergen Gross if (ref == INVALID_GRANT_REF) { 10520d160211SJeremy Fitzhardinge if (net_ratelimit()) 10530d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 10540d160211SJeremy Fitzhardinge rx->id); 10550d160211SJeremy Fitzhardinge err = -EINVAL; 10560d160211SJeremy Fitzhardinge goto next; 10570d160211SJeremy Fitzhardinge } 10580d160211SJeremy Fitzhardinge 105906673c21SJan Beulich if (unlikely(rx->status < 0 || 106006673c21SJan Beulich rx->offset + rx->status > XEN_PAGE_SIZE)) { 106106673c21SJan Beulich if (net_ratelimit()) 106206673c21SJan Beulich dev_warn(dev, "rx->offset: %u, size: %d\n", 106306673c21SJan Beulich rx->offset, rx->status); 106406673c21SJan Beulich xennet_move_rx_slot(queue, skb, ref); 106506673c21SJan Beulich err = -EINVAL; 106606673c21SJan Beulich goto next; 106706673c21SJan Beulich } 106806673c21SJan Beulich 1069c94b731dSJuergen Gross if (!gnttab_end_foreign_access_ref(ref)) { 107066e3531bSJuergen Gross dev_alert(dev, 107166e3531bSJuergen Gross "Grant still in use by backend domain\n"); 107266e3531bSJuergen Gross queue->info->broken = true; 107366e3531bSJuergen Gross dev_alert(dev, "Disabled for further use\n"); 107466e3531bSJuergen Gross return -EINVAL; 107566e3531bSJuergen Gross } 10760d160211SJeremy Fitzhardinge 10772688fcb7SAndrew J. Bennieston gnttab_release_grant_reference(&queue->gref_rx_head, ref); 10780d160211SJeremy Fitzhardinge 10796c5aa6fcSDenis Kirjanov rcu_read_lock(); 10806c5aa6fcSDenis Kirjanov xdp_prog = rcu_dereference(queue->xdp_prog); 10816c5aa6fcSDenis Kirjanov if (xdp_prog) { 10826c5aa6fcSDenis Kirjanov if (!(rx->flags & XEN_NETRXF_more_data)) { 10836c5aa6fcSDenis Kirjanov /* currently only a single page contains data */ 10846c5aa6fcSDenis Kirjanov verdict = xennet_run_xdp(queue, 10856c5aa6fcSDenis Kirjanov skb_frag_page(&skb_shinfo(skb)->frags[0]), 10866c5aa6fcSDenis Kirjanov rx, xdp_prog, &xdp, need_xdp_flush); 10876c5aa6fcSDenis Kirjanov if (verdict != XDP_PASS) 10886c5aa6fcSDenis Kirjanov err = -EINVAL; 10896c5aa6fcSDenis Kirjanov } else { 10906c5aa6fcSDenis Kirjanov /* drop the frame */ 10916c5aa6fcSDenis Kirjanov err = -EINVAL; 10926c5aa6fcSDenis Kirjanov } 10936c5aa6fcSDenis Kirjanov } 10946c5aa6fcSDenis Kirjanov rcu_read_unlock(); 1095f63c2c20SJan Beulich 10966c5aa6fcSDenis Kirjanov __skb_queue_tail(list, skb); 1097f63c2c20SJan Beulich 1098f63c2c20SJan Beulich next: 1099f942dc25SIan Campbell if (!(rx->flags & XEN_NETRXF_more_data)) 11000d160211SJeremy Fitzhardinge break; 11010d160211SJeremy Fitzhardinge 11027158ff6dSWei Liu if (cons + slots == rp) { 11030d160211SJeremy Fitzhardinge if (net_ratelimit()) 11047158ff6dSWei Liu dev_warn(dev, "Need more slots\n"); 11050d160211SJeremy Fitzhardinge err = -ENOENT; 11060d160211SJeremy Fitzhardinge break; 11070d160211SJeremy Fitzhardinge } 11080d160211SJeremy Fitzhardinge 11098446066bSJuergen Gross RING_COPY_RESPONSE(&queue->rx, cons + slots, &rx_local); 11108446066bSJuergen Gross rx = &rx_local; 11112688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons + slots); 11122688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons + slots); 11137158ff6dSWei Liu slots++; 11140d160211SJeremy Fitzhardinge } 11150d160211SJeremy Fitzhardinge 11167158ff6dSWei Liu if (unlikely(slots > max)) { 11170d160211SJeremy Fitzhardinge if (net_ratelimit()) 1118697089dcSWei Liu dev_warn(dev, "Too many slots\n"); 11190d160211SJeremy Fitzhardinge err = -E2BIG; 11200d160211SJeremy Fitzhardinge } 11210d160211SJeremy Fitzhardinge 11220d160211SJeremy Fitzhardinge if (unlikely(err)) 1123b27d4795SJuergen Gross xennet_set_rx_rsp_cons(queue, cons + slots); 11240d160211SJeremy Fitzhardinge 11250d160211SJeremy Fitzhardinge return err; 11260d160211SJeremy Fitzhardinge } 11270d160211SJeremy Fitzhardinge 11280d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 11290d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 11300d160211SJeremy Fitzhardinge { 11310d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 11320d160211SJeremy Fitzhardinge if (net_ratelimit()) 1133383eda32SJoe Perches pr_warn("GSO size must not be zero\n"); 11340d160211SJeremy Fitzhardinge return -EINVAL; 11350d160211SJeremy Fitzhardinge } 11360d160211SJeremy Fitzhardinge 11372c0057deSPaul Durrant if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && 11382c0057deSPaul Durrant gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { 11390d160211SJeremy Fitzhardinge if (net_ratelimit()) 1140383eda32SJoe Perches pr_warn("Bad GSO type %d\n", gso->u.gso.type); 11410d160211SJeremy Fitzhardinge return -EINVAL; 11420d160211SJeremy Fitzhardinge } 11430d160211SJeremy Fitzhardinge 11440d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 11452c0057deSPaul Durrant skb_shinfo(skb)->gso_type = 11462c0057deSPaul Durrant (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? 11472c0057deSPaul Durrant SKB_GSO_TCPV4 : 11482c0057deSPaul Durrant SKB_GSO_TCPV6; 11490d160211SJeremy Fitzhardinge 11500d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 11510d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 11520d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 11530d160211SJeremy Fitzhardinge 11540d160211SJeremy Fitzhardinge return 0; 11550d160211SJeremy Fitzhardinge } 11560d160211SJeremy Fitzhardinge 1157a761129eSDongli Zhang static int xennet_fill_frags(struct netfront_queue *queue, 11580d160211SJeremy Fitzhardinge struct sk_buff *skb, 11590d160211SJeremy Fitzhardinge struct sk_buff_head *list) 11600d160211SJeremy Fitzhardinge { 11612688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 11620d160211SJeremy Fitzhardinge struct sk_buff *nskb; 11630d160211SJeremy Fitzhardinge 11640d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 11658446066bSJuergen Gross struct xen_netif_rx_response rx; 116601c68026SIan Campbell skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; 11670d160211SJeremy Fitzhardinge 11688446066bSJuergen Gross RING_COPY_RESPONSE(&queue->rx, ++cons, &rx); 11698446066bSJuergen Gross 1170d472b3a6SJuergen Gross if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { 1171093b9c71SJan Beulich unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 11720d160211SJeremy Fitzhardinge 1173d81c5054SJuergen Gross BUG_ON(pull_to < skb_headlen(skb)); 1174093b9c71SJan Beulich __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 1175093b9c71SJan Beulich } 1176ad4f15dcSJuergen Gross if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { 1177b27d4795SJuergen Gross xennet_set_rx_rsp_cons(queue, 1178b27d4795SJuergen Gross ++cons + skb_queue_len(list)); 1179ad4f15dcSJuergen Gross kfree_skb(nskb); 1180a761129eSDongli Zhang return -ENOENT; 1181ad4f15dcSJuergen Gross } 1182093b9c71SJan Beulich 1183d472b3a6SJuergen Gross skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 1184d472b3a6SJuergen Gross skb_frag_page(nfrag), 11858446066bSJuergen Gross rx.offset, rx.status, PAGE_SIZE); 11860d160211SJeremy Fitzhardinge 11870d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 11880d160211SJeremy Fitzhardinge kfree_skb(nskb); 11890d160211SJeremy Fitzhardinge } 11900d160211SJeremy Fitzhardinge 1191b27d4795SJuergen Gross xennet_set_rx_rsp_cons(queue, cons); 1192a761129eSDongli Zhang 1193a761129eSDongli Zhang return 0; 11940d160211SJeremy Fitzhardinge } 11950d160211SJeremy Fitzhardinge 1196e0ce4af9SIan Campbell static int checksum_setup(struct net_device *dev, struct sk_buff *skb) 11970d160211SJeremy Fitzhardinge { 1198b5cf66cdSPaul Durrant bool recalculate_partial_csum = false; 1199e0ce4af9SIan Campbell 1200e0ce4af9SIan Campbell /* 1201e0ce4af9SIan Campbell * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy 1202e0ce4af9SIan Campbell * peers can fail to set NETRXF_csum_blank when sending a GSO 1203e0ce4af9SIan Campbell * frame. In this case force the SKB to CHECKSUM_PARTIAL and 1204e0ce4af9SIan Campbell * recalculate the partial checksum. 1205e0ce4af9SIan Campbell */ 1206e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { 1207e0ce4af9SIan Campbell struct netfront_info *np = netdev_priv(dev); 12082688fcb7SAndrew J. Bennieston atomic_inc(&np->rx_gso_checksum_fixup); 1209e0ce4af9SIan Campbell skb->ip_summed = CHECKSUM_PARTIAL; 1210b5cf66cdSPaul Durrant recalculate_partial_csum = true; 1211e0ce4af9SIan Campbell } 1212e0ce4af9SIan Campbell 1213e0ce4af9SIan Campbell /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ 1214e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL) 1215e0ce4af9SIan Campbell return 0; 12160d160211SJeremy Fitzhardinge 1217b5cf66cdSPaul Durrant return skb_checksum_setup(skb, recalculate_partial_csum); 12180d160211SJeremy Fitzhardinge } 12190d160211SJeremy Fitzhardinge 12202688fcb7SAndrew J. Bennieston static int handle_incoming_queue(struct netfront_queue *queue, 12210d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 12220d160211SJeremy Fitzhardinge { 1223900e1833SDavid Vrabel struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); 12240d160211SJeremy Fitzhardinge int packets_dropped = 0; 12250d160211SJeremy Fitzhardinge struct sk_buff *skb; 12260d160211SJeremy Fitzhardinge 12270d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 12283683243bSIan Campbell int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 12290d160211SJeremy Fitzhardinge 1230093b9c71SJan Beulich if (pull_to > skb_headlen(skb)) 12313683243bSIan Campbell __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 12320d160211SJeremy Fitzhardinge 12330d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 12342688fcb7SAndrew J. Bennieston skb->protocol = eth_type_trans(skb, queue->info->netdev); 1235d554f73dSWei Liu skb_reset_network_header(skb); 12360d160211SJeremy Fitzhardinge 12372688fcb7SAndrew J. Bennieston if (checksum_setup(queue->info->netdev, skb)) { 12380d160211SJeremy Fitzhardinge kfree_skb(skb); 12390d160211SJeremy Fitzhardinge packets_dropped++; 12402688fcb7SAndrew J. Bennieston queue->info->netdev->stats.rx_errors++; 12410d160211SJeremy Fitzhardinge continue; 12420d160211SJeremy Fitzhardinge } 12430d160211SJeremy Fitzhardinge 1244900e1833SDavid Vrabel u64_stats_update_begin(&rx_stats->syncp); 1245900e1833SDavid Vrabel rx_stats->packets++; 1246900e1833SDavid Vrabel rx_stats->bytes += skb->len; 1247900e1833SDavid Vrabel u64_stats_update_end(&rx_stats->syncp); 12480d160211SJeremy Fitzhardinge 12490d160211SJeremy Fitzhardinge /* Pass it up. */ 12502688fcb7SAndrew J. Bennieston napi_gro_receive(&queue->napi, skb); 12510d160211SJeremy Fitzhardinge } 12520d160211SJeremy Fitzhardinge 12530d160211SJeremy Fitzhardinge return packets_dropped; 12540d160211SJeremy Fitzhardinge } 12550d160211SJeremy Fitzhardinge 1256bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 12570d160211SJeremy Fitzhardinge { 12582688fcb7SAndrew J. Bennieston struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); 12592688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 12600d160211SJeremy Fitzhardinge struct sk_buff *skb; 12610d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 12620d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 12630d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 12640d160211SJeremy Fitzhardinge RING_IDX i, rp; 1265bea3348eSStephen Hemminger int work_done; 12660d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 12670d160211SJeremy Fitzhardinge struct sk_buff_head errq; 12680d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 12690d160211SJeremy Fitzhardinge int err; 12706c5aa6fcSDenis Kirjanov bool need_xdp_flush = false; 12710d160211SJeremy Fitzhardinge 12722688fcb7SAndrew J. Bennieston spin_lock(&queue->rx_lock); 12730d160211SJeremy Fitzhardinge 12740d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 12750d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 12760d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 12770d160211SJeremy Fitzhardinge 12782688fcb7SAndrew J. Bennieston rp = queue->rx.sring->rsp_prod; 1279a884daa6SJuergen Gross if (RING_RESPONSE_PROD_OVERFLOW(&queue->rx, rp)) { 1280a884daa6SJuergen Gross dev_alert(&dev->dev, "Illegal number of responses %u\n", 1281a884daa6SJuergen Gross rp - queue->rx.rsp_cons); 1282a884daa6SJuergen Gross queue->info->broken = true; 1283a884daa6SJuergen Gross spin_unlock(&queue->rx_lock); 1284a884daa6SJuergen Gross return 0; 1285a884daa6SJuergen Gross } 12860d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 12870d160211SJeremy Fitzhardinge 12882688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 12890d160211SJeremy Fitzhardinge work_done = 0; 12900d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 12918446066bSJuergen Gross RING_COPY_RESPONSE(&queue->rx, i, rx); 12920d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 12930d160211SJeremy Fitzhardinge 12946c5aa6fcSDenis Kirjanov err = xennet_get_responses(queue, &rinfo, rp, &tmpq, 12956c5aa6fcSDenis Kirjanov &need_xdp_flush); 12960d160211SJeremy Fitzhardinge 12970d160211SJeremy Fitzhardinge if (unlikely(err)) { 129866e3531bSJuergen Gross if (queue->info->broken) { 129966e3531bSJuergen Gross spin_unlock(&queue->rx_lock); 130066e3531bSJuergen Gross return 0; 130166e3531bSJuergen Gross } 13020d160211SJeremy Fitzhardinge err: 13030d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 13040d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 130509f75cd7SJeff Garzik dev->stats.rx_errors++; 13062688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 13070d160211SJeremy Fitzhardinge continue; 13080d160211SJeremy Fitzhardinge } 13090d160211SJeremy Fitzhardinge 13100d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 13110d160211SJeremy Fitzhardinge 13120d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 13130d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 13140d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 13150d160211SJeremy Fitzhardinge 13160d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 13170d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 1318b27d4795SJuergen Gross xennet_set_rx_rsp_cons(queue, 1319b27d4795SJuergen Gross queue->rx.rsp_cons + 1320b27d4795SJuergen Gross skb_queue_len(&tmpq)); 13210d160211SJeremy Fitzhardinge goto err; 13220d160211SJeremy Fitzhardinge } 13230d160211SJeremy Fitzhardinge } 13240d160211SJeremy Fitzhardinge 13253683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = rx->status; 13263683243bSIan Campbell if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) 13273683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; 13280d160211SJeremy Fitzhardinge 1329b54c9d5bSJonathan Lemon skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset); 13303683243bSIan Campbell skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); 13313683243bSIan Campbell skb->data_len = rx->status; 1332093b9c71SJan Beulich skb->len += rx->status; 13330d160211SJeremy Fitzhardinge 1334a761129eSDongli Zhang if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) 1335ad4f15dcSJuergen Gross goto err; 13360d160211SJeremy Fitzhardinge 1337f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_csum_blank) 13380d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 1339f942dc25SIan Campbell else if (rx->flags & XEN_NETRXF_data_validated) 13400d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 13410d160211SJeremy Fitzhardinge 13420d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 13430d160211SJeremy Fitzhardinge 1344b27d4795SJuergen Gross i = queue->rx.rsp_cons + 1; 1345b27d4795SJuergen Gross xennet_set_rx_rsp_cons(queue, i); 13460d160211SJeremy Fitzhardinge work_done++; 13470d160211SJeremy Fitzhardinge } 13486c5aa6fcSDenis Kirjanov if (need_xdp_flush) 13496c5aa6fcSDenis Kirjanov xdp_do_flush(); 13500d160211SJeremy Fitzhardinge 135156cfe5d0SWang Chen __skb_queue_purge(&errq); 13520d160211SJeremy Fitzhardinge 13532688fcb7SAndrew J. Bennieston work_done -= handle_incoming_queue(queue, &rxq); 13540d160211SJeremy Fitzhardinge 13552688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 13560d160211SJeremy Fitzhardinge 13570d160211SJeremy Fitzhardinge if (work_done < budget) { 1358bea3348eSStephen Hemminger int more_to_do = 0; 1359bea3348eSStephen Hemminger 13606ad20165SEric Dumazet napi_complete_done(napi, work_done); 13610d160211SJeremy Fitzhardinge 13622688fcb7SAndrew J. Bennieston RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); 13636a6dc08fSDavid Vrabel if (more_to_do) 13646a6dc08fSDavid Vrabel napi_schedule(napi); 13650d160211SJeremy Fitzhardinge } 13660d160211SJeremy Fitzhardinge 13672688fcb7SAndrew J. Bennieston spin_unlock(&queue->rx_lock); 13680d160211SJeremy Fitzhardinge 1369bea3348eSStephen Hemminger return work_done; 13700d160211SJeremy Fitzhardinge } 13710d160211SJeremy Fitzhardinge 13720d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 13730d160211SJeremy Fitzhardinge { 13740c36820eSJonathan Davies int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; 13750d160211SJeremy Fitzhardinge 13760d160211SJeremy Fitzhardinge if (mtu > max) 13770d160211SJeremy Fitzhardinge return -EINVAL; 13780d160211SJeremy Fitzhardinge dev->mtu = mtu; 13790d160211SJeremy Fitzhardinge return 0; 13800d160211SJeremy Fitzhardinge } 13810d160211SJeremy Fitzhardinge 1382bc1f4470Sstephen hemminger static void xennet_get_stats64(struct net_device *dev, 1383e00f85beSstephen hemminger struct rtnl_link_stats64 *tot) 1384e00f85beSstephen hemminger { 1385e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 1386e00f85beSstephen hemminger int cpu; 1387e00f85beSstephen hemminger 1388e00f85beSstephen hemminger for_each_possible_cpu(cpu) { 1389900e1833SDavid Vrabel struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); 1390900e1833SDavid Vrabel struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); 1391e00f85beSstephen hemminger u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1392e00f85beSstephen hemminger unsigned int start; 1393e00f85beSstephen hemminger 1394e00f85beSstephen hemminger do { 1395*068c38adSThomas Gleixner start = u64_stats_fetch_begin(&tx_stats->syncp); 1396900e1833SDavid Vrabel tx_packets = tx_stats->packets; 1397900e1833SDavid Vrabel tx_bytes = tx_stats->bytes; 1398*068c38adSThomas Gleixner } while (u64_stats_fetch_retry(&tx_stats->syncp, start)); 1399e00f85beSstephen hemminger 1400900e1833SDavid Vrabel do { 1401*068c38adSThomas Gleixner start = u64_stats_fetch_begin(&rx_stats->syncp); 1402900e1833SDavid Vrabel rx_packets = rx_stats->packets; 1403900e1833SDavid Vrabel rx_bytes = rx_stats->bytes; 1404*068c38adSThomas Gleixner } while (u64_stats_fetch_retry(&rx_stats->syncp, start)); 1405e00f85beSstephen hemminger 1406e00f85beSstephen hemminger tot->rx_packets += rx_packets; 1407e00f85beSstephen hemminger tot->tx_packets += tx_packets; 1408e00f85beSstephen hemminger tot->rx_bytes += rx_bytes; 1409e00f85beSstephen hemminger tot->tx_bytes += tx_bytes; 1410e00f85beSstephen hemminger } 1411e00f85beSstephen hemminger 1412e00f85beSstephen hemminger tot->rx_errors = dev->stats.rx_errors; 1413e00f85beSstephen hemminger tot->tx_dropped = dev->stats.tx_dropped; 1414e00f85beSstephen hemminger } 1415e00f85beSstephen hemminger 14162688fcb7SAndrew J. Bennieston static void xennet_release_tx_bufs(struct netfront_queue *queue) 14170d160211SJeremy Fitzhardinge { 14180d160211SJeremy Fitzhardinge struct sk_buff *skb; 14190d160211SJeremy Fitzhardinge int i; 14200d160211SJeremy Fitzhardinge 14210d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 14220d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 142321631d2dSJuergen Gross if (!queue->tx_skbs[i]) 14240d160211SJeremy Fitzhardinge continue; 14250d160211SJeremy Fitzhardinge 142621631d2dSJuergen Gross skb = queue->tx_skbs[i]; 142721631d2dSJuergen Gross queue->tx_skbs[i] = NULL; 14282688fcb7SAndrew J. Bennieston get_page(queue->grant_tx_page[i]); 14292688fcb7SAndrew J. Bennieston gnttab_end_foreign_access(queue->grant_tx_ref[i], 143049f8b459SJuergen Gross queue->grant_tx_page[i]); 14312688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 1432145daab2SJuergen Gross queue->grant_tx_ref[i] = INVALID_GRANT_REF; 143321631d2dSJuergen Gross add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, i); 14340d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 14350d160211SJeremy Fitzhardinge } 14360d160211SJeremy Fitzhardinge } 14370d160211SJeremy Fitzhardinge 14382688fcb7SAndrew J. Bennieston static void xennet_release_rx_bufs(struct netfront_queue *queue) 14390d160211SJeremy Fitzhardinge { 14400d160211SJeremy Fitzhardinge int id, ref; 14410d160211SJeremy Fitzhardinge 14422688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 14430d160211SJeremy Fitzhardinge 14440d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 1445cefe0078SAnnie Li struct sk_buff *skb; 1446cefe0078SAnnie Li struct page *page; 14470d160211SJeremy Fitzhardinge 14482688fcb7SAndrew J. Bennieston skb = queue->rx_skbs[id]; 1449cefe0078SAnnie Li if (!skb) 1450cefe0078SAnnie Li continue; 1451cefe0078SAnnie Li 14522688fcb7SAndrew J. Bennieston ref = queue->grant_rx_ref[id]; 1453145daab2SJuergen Gross if (ref == INVALID_GRANT_REF) 1454cefe0078SAnnie Li continue; 1455cefe0078SAnnie Li 1456cefe0078SAnnie Li page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 1457cefe0078SAnnie Li 1458cefe0078SAnnie Li /* gnttab_end_foreign_access() needs a page ref until 1459cefe0078SAnnie Li * foreign access is ended (which may be deferred). 1460cefe0078SAnnie Li */ 1461cefe0078SAnnie Li get_page(page); 146249f8b459SJuergen Gross gnttab_end_foreign_access(ref, page); 1463145daab2SJuergen Gross queue->grant_rx_ref[id] = INVALID_GRANT_REF; 14640d160211SJeremy Fitzhardinge 1465cefe0078SAnnie Li kfree_skb(skb); 14660d160211SJeremy Fitzhardinge } 14670d160211SJeremy Fitzhardinge 14682688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 14690d160211SJeremy Fitzhardinge } 14700d160211SJeremy Fitzhardinge 1471c8f44affSMichał Mirosław static netdev_features_t xennet_fix_features(struct net_device *dev, 1472c8f44affSMichał Mirosław netdev_features_t features) 14738f7b01a1SEric Dumazet { 14748f7b01a1SEric Dumazet struct netfront_info *np = netdev_priv(dev); 14758f7b01a1SEric Dumazet 14762890ea5cSJuergen Gross if (features & NETIF_F_SG && 14772890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) 14788f7b01a1SEric Dumazet features &= ~NETIF_F_SG; 14798f7b01a1SEric Dumazet 14802890ea5cSJuergen Gross if (features & NETIF_F_IPV6_CSUM && 14812890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, 14822890ea5cSJuergen Gross "feature-ipv6-csum-offload", 0)) 14832c0057deSPaul Durrant features &= ~NETIF_F_IPV6_CSUM; 14842c0057deSPaul Durrant 14852890ea5cSJuergen Gross if (features & NETIF_F_TSO && 14862890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) 14878f7b01a1SEric Dumazet features &= ~NETIF_F_TSO; 14888f7b01a1SEric Dumazet 14892890ea5cSJuergen Gross if (features & NETIF_F_TSO6 && 14902890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) 14912c0057deSPaul Durrant features &= ~NETIF_F_TSO6; 14922c0057deSPaul Durrant 14938f7b01a1SEric Dumazet return features; 14948f7b01a1SEric Dumazet } 14958f7b01a1SEric Dumazet 1496c8f44affSMichał Mirosław static int xennet_set_features(struct net_device *dev, 1497c8f44affSMichał Mirosław netdev_features_t features) 14988f7b01a1SEric Dumazet { 14998f7b01a1SEric Dumazet if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { 15008f7b01a1SEric Dumazet netdev_info(dev, "Reducing MTU because no SG offload"); 15018f7b01a1SEric Dumazet dev->mtu = ETH_DATA_LEN; 15028f7b01a1SEric Dumazet } 15038f7b01a1SEric Dumazet 15048f7b01a1SEric Dumazet return 0; 15058f7b01a1SEric Dumazet } 15068f7b01a1SEric Dumazet 1507b27d4795SJuergen Gross static bool xennet_handle_tx(struct netfront_queue *queue, unsigned int *eoi) 1508cf66f9d4SKonrad Rzeszutek Wilk { 1509cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 1510cf66f9d4SKonrad Rzeszutek Wilk 1511b27d4795SJuergen Gross if (unlikely(queue->info->broken)) 1512b27d4795SJuergen Gross return false; 1513a884daa6SJuergen Gross 15142688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 1515b27d4795SJuergen Gross if (xennet_tx_buf_gc(queue)) 1516b27d4795SJuergen Gross *eoi = 0; 15172688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 1518cf66f9d4SKonrad Rzeszutek Wilk 1519b27d4795SJuergen Gross return true; 1520b27d4795SJuergen Gross } 1521b27d4795SJuergen Gross 1522b27d4795SJuergen Gross static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) 1523b27d4795SJuergen Gross { 1524b27d4795SJuergen Gross unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS; 1525b27d4795SJuergen Gross 1526b27d4795SJuergen Gross if (likely(xennet_handle_tx(dev_id, &eoiflag))) 1527b27d4795SJuergen Gross xen_irq_lateeoi(irq, eoiflag); 1528b27d4795SJuergen Gross 1529cf66f9d4SKonrad Rzeszutek Wilk return IRQ_HANDLED; 1530cf66f9d4SKonrad Rzeszutek Wilk } 1531cf66f9d4SKonrad Rzeszutek Wilk 1532b27d4795SJuergen Gross static bool xennet_handle_rx(struct netfront_queue *queue, unsigned int *eoi) 1533b27d4795SJuergen Gross { 1534b27d4795SJuergen Gross unsigned int work_queued; 1535b27d4795SJuergen Gross unsigned long flags; 1536b27d4795SJuergen Gross 1537b27d4795SJuergen Gross if (unlikely(queue->info->broken)) 1538b27d4795SJuergen Gross return false; 1539b27d4795SJuergen Gross 1540b27d4795SJuergen Gross spin_lock_irqsave(&queue->rx_cons_lock, flags); 15416fac592cSJuergen Gross work_queued = XEN_RING_NR_UNCONSUMED_RESPONSES(&queue->rx); 1542b27d4795SJuergen Gross if (work_queued > queue->rx_rsp_unconsumed) { 1543b27d4795SJuergen Gross queue->rx_rsp_unconsumed = work_queued; 1544b27d4795SJuergen Gross *eoi = 0; 1545b27d4795SJuergen Gross } else if (unlikely(work_queued < queue->rx_rsp_unconsumed)) { 1546b27d4795SJuergen Gross const struct device *dev = &queue->info->netdev->dev; 1547b27d4795SJuergen Gross 1548b27d4795SJuergen Gross spin_unlock_irqrestore(&queue->rx_cons_lock, flags); 1549b27d4795SJuergen Gross dev_alert(dev, "RX producer index going backwards\n"); 1550b27d4795SJuergen Gross dev_alert(dev, "Disabled for further use\n"); 1551b27d4795SJuergen Gross queue->info->broken = true; 1552b27d4795SJuergen Gross return false; 1553b27d4795SJuergen Gross } 1554b27d4795SJuergen Gross spin_unlock_irqrestore(&queue->rx_cons_lock, flags); 1555b27d4795SJuergen Gross 1556b27d4795SJuergen Gross if (likely(netif_carrier_ok(queue->info->netdev) && work_queued)) 1557b27d4795SJuergen Gross napi_schedule(&queue->napi); 1558b27d4795SJuergen Gross 1559b27d4795SJuergen Gross return true; 1560b27d4795SJuergen Gross } 1561b27d4795SJuergen Gross 1562d634bf2cSWei Liu static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) 1563d634bf2cSWei Liu { 1564b27d4795SJuergen Gross unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS; 1565d634bf2cSWei Liu 1566b27d4795SJuergen Gross if (likely(xennet_handle_rx(dev_id, &eoiflag))) 1567b27d4795SJuergen Gross xen_irq_lateeoi(irq, eoiflag); 1568d634bf2cSWei Liu 1569d634bf2cSWei Liu return IRQ_HANDLED; 1570d634bf2cSWei Liu } 1571d634bf2cSWei Liu 1572d634bf2cSWei Liu static irqreturn_t xennet_interrupt(int irq, void *dev_id) 1573d634bf2cSWei Liu { 1574b27d4795SJuergen Gross unsigned int eoiflag = XEN_EOI_FLAG_SPURIOUS; 1575b27d4795SJuergen Gross 1576b27d4795SJuergen Gross if (xennet_handle_tx(dev_id, &eoiflag) && 1577b27d4795SJuergen Gross xennet_handle_rx(dev_id, &eoiflag)) 1578b27d4795SJuergen Gross xen_irq_lateeoi(irq, eoiflag); 1579b27d4795SJuergen Gross 1580d634bf2cSWei Liu return IRQ_HANDLED; 1581d634bf2cSWei Liu } 1582d634bf2cSWei Liu 1583cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1584cf66f9d4SKonrad Rzeszutek Wilk static void xennet_poll_controller(struct net_device *dev) 1585cf66f9d4SKonrad Rzeszutek Wilk { 15862688fcb7SAndrew J. Bennieston /* Poll each queue */ 15872688fcb7SAndrew J. Bennieston struct netfront_info *info = netdev_priv(dev); 15882688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 15892688fcb7SAndrew J. Bennieston unsigned int i; 1590a884daa6SJuergen Gross 1591a884daa6SJuergen Gross if (info->broken) 1592a884daa6SJuergen Gross return; 1593a884daa6SJuergen Gross 15942688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) 15952688fcb7SAndrew J. Bennieston xennet_interrupt(0, &info->queues[i]); 1596cf66f9d4SKonrad Rzeszutek Wilk } 1597cf66f9d4SKonrad Rzeszutek Wilk #endif 1598cf66f9d4SKonrad Rzeszutek Wilk 15996c5aa6fcSDenis Kirjanov #define NETBACK_XDP_HEADROOM_DISABLE 0 16006c5aa6fcSDenis Kirjanov #define NETBACK_XDP_HEADROOM_ENABLE 1 16016c5aa6fcSDenis Kirjanov 16026c5aa6fcSDenis Kirjanov static int talk_to_netback_xdp(struct netfront_info *np, int xdp) 16036c5aa6fcSDenis Kirjanov { 16046c5aa6fcSDenis Kirjanov int err; 16056c5aa6fcSDenis Kirjanov unsigned short headroom; 16066c5aa6fcSDenis Kirjanov 16076c5aa6fcSDenis Kirjanov headroom = xdp ? XDP_PACKET_HEADROOM : 0; 16086c5aa6fcSDenis Kirjanov err = xenbus_printf(XBT_NIL, np->xbdev->nodename, 16096c5aa6fcSDenis Kirjanov "xdp-headroom", "%hu", 16106c5aa6fcSDenis Kirjanov headroom); 16116c5aa6fcSDenis Kirjanov if (err) 16126c5aa6fcSDenis Kirjanov pr_warn("Error writing xdp-headroom\n"); 16136c5aa6fcSDenis Kirjanov 16146c5aa6fcSDenis Kirjanov return err; 16156c5aa6fcSDenis Kirjanov } 16166c5aa6fcSDenis Kirjanov 16176c5aa6fcSDenis Kirjanov static int xennet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 16186c5aa6fcSDenis Kirjanov struct netlink_ext_ack *extack) 16196c5aa6fcSDenis Kirjanov { 16206c5aa6fcSDenis Kirjanov unsigned long max_mtu = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM; 16216c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 16226c5aa6fcSDenis Kirjanov struct bpf_prog *old_prog; 16236c5aa6fcSDenis Kirjanov unsigned int i, err; 16246c5aa6fcSDenis Kirjanov 16256c5aa6fcSDenis Kirjanov if (dev->mtu > max_mtu) { 16266c5aa6fcSDenis Kirjanov netdev_warn(dev, "XDP requires MTU less than %lu\n", max_mtu); 16276c5aa6fcSDenis Kirjanov return -EINVAL; 16286c5aa6fcSDenis Kirjanov } 16296c5aa6fcSDenis Kirjanov 16306c5aa6fcSDenis Kirjanov if (!np->netback_has_xdp_headroom) 16316c5aa6fcSDenis Kirjanov return 0; 16326c5aa6fcSDenis Kirjanov 16336c5aa6fcSDenis Kirjanov xenbus_switch_state(np->xbdev, XenbusStateReconfiguring); 16346c5aa6fcSDenis Kirjanov 16356c5aa6fcSDenis Kirjanov err = talk_to_netback_xdp(np, prog ? NETBACK_XDP_HEADROOM_ENABLE : 16366c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_DISABLE); 16376c5aa6fcSDenis Kirjanov if (err) 16386c5aa6fcSDenis Kirjanov return err; 16396c5aa6fcSDenis Kirjanov 16406c5aa6fcSDenis Kirjanov /* avoid the race with XDP headroom adjustment */ 16416c5aa6fcSDenis Kirjanov wait_event(module_wq, 16426c5aa6fcSDenis Kirjanov xenbus_read_driver_state(np->xbdev->otherend) == 16436c5aa6fcSDenis Kirjanov XenbusStateReconfigured); 16446c5aa6fcSDenis Kirjanov np->netfront_xdp_enabled = true; 16456c5aa6fcSDenis Kirjanov 16466c5aa6fcSDenis Kirjanov old_prog = rtnl_dereference(np->queues[0].xdp_prog); 16476c5aa6fcSDenis Kirjanov 16486c5aa6fcSDenis Kirjanov if (prog) 16496c5aa6fcSDenis Kirjanov bpf_prog_add(prog, dev->real_num_tx_queues); 16506c5aa6fcSDenis Kirjanov 16516c5aa6fcSDenis Kirjanov for (i = 0; i < dev->real_num_tx_queues; ++i) 16526c5aa6fcSDenis Kirjanov rcu_assign_pointer(np->queues[i].xdp_prog, prog); 16536c5aa6fcSDenis Kirjanov 16546c5aa6fcSDenis Kirjanov if (old_prog) 16556c5aa6fcSDenis Kirjanov for (i = 0; i < dev->real_num_tx_queues; ++i) 16566c5aa6fcSDenis Kirjanov bpf_prog_put(old_prog); 16576c5aa6fcSDenis Kirjanov 16586c5aa6fcSDenis Kirjanov xenbus_switch_state(np->xbdev, XenbusStateConnected); 16596c5aa6fcSDenis Kirjanov 16606c5aa6fcSDenis Kirjanov return 0; 16616c5aa6fcSDenis Kirjanov } 16626c5aa6fcSDenis Kirjanov 16636c5aa6fcSDenis Kirjanov static int xennet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 16646c5aa6fcSDenis Kirjanov { 1665a884daa6SJuergen Gross struct netfront_info *np = netdev_priv(dev); 1666a884daa6SJuergen Gross 1667a884daa6SJuergen Gross if (np->broken) 1668a884daa6SJuergen Gross return -ENODEV; 1669a884daa6SJuergen Gross 16706c5aa6fcSDenis Kirjanov switch (xdp->command) { 16716c5aa6fcSDenis Kirjanov case XDP_SETUP_PROG: 16726c5aa6fcSDenis Kirjanov return xennet_xdp_set(dev, xdp->prog, xdp->extack); 16736c5aa6fcSDenis Kirjanov default: 16746c5aa6fcSDenis Kirjanov return -EINVAL; 16756c5aa6fcSDenis Kirjanov } 16766c5aa6fcSDenis Kirjanov } 16776c5aa6fcSDenis Kirjanov 16780a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 1679dcf4ff7aSMarek Marczykowski-Górecki .ndo_uninit = xennet_uninit, 16800a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 16810a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 16820a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 16830a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 1684e00f85beSstephen hemminger .ndo_get_stats64 = xennet_get_stats64, 16850a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 16860a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 1687fb507934SMichał Mirosław .ndo_fix_features = xennet_fix_features, 1688fb507934SMichał Mirosław .ndo_set_features = xennet_set_features, 16892688fcb7SAndrew J. Bennieston .ndo_select_queue = xennet_select_queue, 16906c5aa6fcSDenis Kirjanov .ndo_bpf = xennet_xdp, 16916c5aa6fcSDenis Kirjanov .ndo_xdp_xmit = xennet_xdp_xmit, 1692cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1693cf66f9d4SKonrad Rzeszutek Wilk .ndo_poll_controller = xennet_poll_controller, 1694cf66f9d4SKonrad Rzeszutek Wilk #endif 16950a0b9d2eSStephen Hemminger }; 16960a0b9d2eSStephen Hemminger 1697900e1833SDavid Vrabel static void xennet_free_netdev(struct net_device *netdev) 1698900e1833SDavid Vrabel { 1699900e1833SDavid Vrabel struct netfront_info *np = netdev_priv(netdev); 1700900e1833SDavid Vrabel 1701900e1833SDavid Vrabel free_percpu(np->rx_stats); 1702900e1833SDavid Vrabel free_percpu(np->tx_stats); 1703900e1833SDavid Vrabel free_netdev(netdev); 1704900e1833SDavid Vrabel } 1705900e1833SDavid Vrabel 17068e0e46bbSBill Pemberton static struct net_device *xennet_create_dev(struct xenbus_device *dev) 17070d160211SJeremy Fitzhardinge { 17082688fcb7SAndrew J. Bennieston int err; 17090d160211SJeremy Fitzhardinge struct net_device *netdev; 17100d160211SJeremy Fitzhardinge struct netfront_info *np; 17110d160211SJeremy Fitzhardinge 171250ee6061SAndrew J. Bennieston netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); 171341de8d4cSJoe Perches if (!netdev) 17140d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 17150d160211SJeremy Fitzhardinge 17160d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 17170d160211SJeremy Fitzhardinge np->xbdev = dev; 17180d160211SJeremy Fitzhardinge 17192688fcb7SAndrew J. Bennieston np->queues = NULL; 17200d160211SJeremy Fitzhardinge 1721e00f85beSstephen hemminger err = -ENOMEM; 1722900e1833SDavid Vrabel np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1723900e1833SDavid Vrabel if (np->rx_stats == NULL) 1724900e1833SDavid Vrabel goto exit; 1725900e1833SDavid Vrabel np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1726900e1833SDavid Vrabel if (np->tx_stats == NULL) 1727e00f85beSstephen hemminger goto exit; 1728e00f85beSstephen hemminger 17290a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 17300a0b9d2eSStephen Hemminger 1731fb507934SMichał Mirosław netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | 1732fb507934SMichał Mirosław NETIF_F_GSO_ROBUST; 17332c0057deSPaul Durrant netdev->hw_features = NETIF_F_SG | 17342c0057deSPaul Durrant NETIF_F_IPV6_CSUM | 17352c0057deSPaul Durrant NETIF_F_TSO | NETIF_F_TSO6; 17360d160211SJeremy Fitzhardinge 1737fc3e5941SIan Campbell /* 1738fc3e5941SIan Campbell * Assume that all hw features are available for now. This set 1739fc3e5941SIan Campbell * will be adjusted by the call to netdev_update_features() in 1740fc3e5941SIan Campbell * xennet_connect() which is the earliest point where we can 1741fc3e5941SIan Campbell * negotiate with the backend regarding supported features. 1742fc3e5941SIan Campbell */ 1743fc3e5941SIan Campbell netdev->features |= netdev->hw_features; 1744fc3e5941SIan Campbell 17457ad24ea4SWilfried Klaebe netdev->ethtool_ops = &xennet_ethtool_ops; 1746e1043a4bSMohammed Gamal netdev->min_mtu = ETH_MIN_MTU; 1747d0c2c997SJarod Wilson netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; 17480d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 17490d160211SJeremy Fitzhardinge 17500d160211SJeremy Fitzhardinge np->netdev = netdev; 17516c5aa6fcSDenis Kirjanov np->netfront_xdp_enabled = false; 17520d160211SJeremy Fitzhardinge 17530d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 17540d160211SJeremy Fitzhardinge 1755c2c63310SAndrea Righi do { 1756b707fda2SEduardo Otubo xenbus_switch_state(dev, XenbusStateInitialising); 1757c2c63310SAndrea Righi err = wait_event_timeout(module_wq, 1758822fb18aSXiao Liang xenbus_read_driver_state(dev->otherend) != 1759822fb18aSXiao Liang XenbusStateClosed && 1760822fb18aSXiao Liang xenbus_read_driver_state(dev->otherend) != 1761c2c63310SAndrea Righi XenbusStateUnknown, XENNET_TIMEOUT); 1762c2c63310SAndrea Righi } while (!err); 1763c2c63310SAndrea Righi 17640d160211SJeremy Fitzhardinge return netdev; 17650d160211SJeremy Fitzhardinge 17660d160211SJeremy Fitzhardinge exit: 1767900e1833SDavid Vrabel xennet_free_netdev(netdev); 17680d160211SJeremy Fitzhardinge return ERR_PTR(err); 17690d160211SJeremy Fitzhardinge } 17700d160211SJeremy Fitzhardinge 177180708602SLee Jones /* 17720d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 17730d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 17740d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 17750d160211SJeremy Fitzhardinge */ 17768e0e46bbSBill Pemberton static int netfront_probe(struct xenbus_device *dev, 17770d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 17780d160211SJeremy Fitzhardinge { 17790d160211SJeremy Fitzhardinge int err; 17800d160211SJeremy Fitzhardinge struct net_device *netdev; 17810d160211SJeremy Fitzhardinge struct netfront_info *info; 17820d160211SJeremy Fitzhardinge 17830d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 17840d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 17850d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 17860d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 17870d160211SJeremy Fitzhardinge return err; 17880d160211SJeremy Fitzhardinge } 17890d160211SJeremy Fitzhardinge 17900d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 17911b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 179227b917e5STakashi Iwai #ifdef CONFIG_SYSFS 179327b917e5STakashi Iwai info->netdev->sysfs_groups[0] = &xennet_dev_group; 179427b917e5STakashi Iwai #endif 17950d160211SJeremy Fitzhardinge 17960d160211SJeremy Fitzhardinge return 0; 17970d160211SJeremy Fitzhardinge } 17980d160211SJeremy Fitzhardinge 17990d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 18000d160211SJeremy Fitzhardinge { 18010d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 1802145daab2SJuergen Gross if (ref != INVALID_GRANT_REF) 180349f8b459SJuergen Gross gnttab_end_foreign_access(ref, virt_to_page(page)); 18040d160211SJeremy Fitzhardinge } 18050d160211SJeremy Fitzhardinge 18060d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 18070d160211SJeremy Fitzhardinge { 18082688fcb7SAndrew J. Bennieston unsigned int i = 0; 18092688fcb7SAndrew J. Bennieston unsigned int num_queues = info->netdev->real_num_tx_queues; 18100d160211SJeremy Fitzhardinge 1811f9feb1e6SDavid Vrabel netif_carrier_off(info->netdev); 1812f9feb1e6SDavid Vrabel 18139a873c71SChas Williams for (i = 0; i < num_queues && info->queues; ++i) { 181476541869SDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 181576541869SDavid Vrabel 181674470954SBoris Ostrovsky del_timer_sync(&queue->rx_refill_timer); 181774470954SBoris Ostrovsky 18182688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) 18192688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 18202688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { 18212688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 18222688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->rx_irq, queue); 1823d634bf2cSWei Liu } 18242688fcb7SAndrew J. Bennieston queue->tx_evtchn = queue->rx_evtchn = 0; 18252688fcb7SAndrew J. Bennieston queue->tx_irq = queue->rx_irq = 0; 18260d160211SJeremy Fitzhardinge 1827274b0455SChas Williams if (netif_running(info->netdev)) 1828f9feb1e6SDavid Vrabel napi_synchronize(&queue->napi); 1829f9feb1e6SDavid Vrabel 1830a5b5dc3cSDavid Vrabel xennet_release_tx_bufs(queue); 1831a5b5dc3cSDavid Vrabel xennet_release_rx_bufs(queue); 1832a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_tx_head); 1833a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_rx_head); 1834a5b5dc3cSDavid Vrabel 18350d160211SJeremy Fitzhardinge /* End access and free the pages */ 18362688fcb7SAndrew J. Bennieston xennet_end_access(queue->tx_ring_ref, queue->tx.sring); 18372688fcb7SAndrew J. Bennieston xennet_end_access(queue->rx_ring_ref, queue->rx.sring); 18380d160211SJeremy Fitzhardinge 1839145daab2SJuergen Gross queue->tx_ring_ref = INVALID_GRANT_REF; 1840145daab2SJuergen Gross queue->rx_ring_ref = INVALID_GRANT_REF; 18412688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 18422688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 18436c5aa6fcSDenis Kirjanov 18446c5aa6fcSDenis Kirjanov page_pool_destroy(queue->page_pool); 18452688fcb7SAndrew J. Bennieston } 18460d160211SJeremy Fitzhardinge } 18470d160211SJeremy Fitzhardinge 184880708602SLee Jones /* 18490d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 18500d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 18510d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 18520d160211SJeremy Fitzhardinge * rest of the kernel. 18530d160211SJeremy Fitzhardinge */ 18540d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 18550d160211SJeremy Fitzhardinge { 18561b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 18570d160211SJeremy Fitzhardinge 18580d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 18590d160211SJeremy Fitzhardinge 1860042b2046SDongli Zhang netif_tx_lock_bh(info->netdev); 1861042b2046SDongli Zhang netif_device_detach(info->netdev); 1862042b2046SDongli Zhang netif_tx_unlock_bh(info->netdev); 1863042b2046SDongli Zhang 18640d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 18650d160211SJeremy Fitzhardinge return 0; 18660d160211SJeremy Fitzhardinge } 18670d160211SJeremy Fitzhardinge 18680d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 18690d160211SJeremy Fitzhardinge { 18700d160211SJeremy Fitzhardinge char *s, *e, *macstr; 18710d160211SJeremy Fitzhardinge int i; 18720d160211SJeremy Fitzhardinge 18730d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 18740d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 18750d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 18760d160211SJeremy Fitzhardinge 18770d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 18780d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 18790d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 18800d160211SJeremy Fitzhardinge kfree(macstr); 18810d160211SJeremy Fitzhardinge return -ENOENT; 18820d160211SJeremy Fitzhardinge } 18830d160211SJeremy Fitzhardinge s = e+1; 18840d160211SJeremy Fitzhardinge } 18850d160211SJeremy Fitzhardinge 18860d160211SJeremy Fitzhardinge kfree(macstr); 18870d160211SJeremy Fitzhardinge return 0; 18880d160211SJeremy Fitzhardinge } 18890d160211SJeremy Fitzhardinge 18902688fcb7SAndrew J. Bennieston static int setup_netfront_single(struct netfront_queue *queue) 1891d634bf2cSWei Liu { 1892d634bf2cSWei Liu int err; 1893d634bf2cSWei Liu 18942688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1895d634bf2cSWei Liu if (err < 0) 1896d634bf2cSWei Liu goto fail; 1897d634bf2cSWei Liu 1898b27d4795SJuergen Gross err = bind_evtchn_to_irqhandler_lateeoi(queue->tx_evtchn, 1899b27d4795SJuergen Gross xennet_interrupt, 0, 1900b27d4795SJuergen Gross queue->info->netdev->name, 1901b27d4795SJuergen Gross queue); 1902d634bf2cSWei Liu if (err < 0) 1903d634bf2cSWei Liu goto bind_fail; 19042688fcb7SAndrew J. Bennieston queue->rx_evtchn = queue->tx_evtchn; 19052688fcb7SAndrew J. Bennieston queue->rx_irq = queue->tx_irq = err; 1906d634bf2cSWei Liu 1907d634bf2cSWei Liu return 0; 1908d634bf2cSWei Liu 1909d634bf2cSWei Liu bind_fail: 19102688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 19112688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1912d634bf2cSWei Liu fail: 1913d634bf2cSWei Liu return err; 1914d634bf2cSWei Liu } 1915d634bf2cSWei Liu 19162688fcb7SAndrew J. Bennieston static int setup_netfront_split(struct netfront_queue *queue) 1917d634bf2cSWei Liu { 1918d634bf2cSWei Liu int err; 1919d634bf2cSWei Liu 19202688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1921d634bf2cSWei Liu if (err < 0) 1922d634bf2cSWei Liu goto fail; 19232688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); 1924d634bf2cSWei Liu if (err < 0) 1925d634bf2cSWei Liu goto alloc_rx_evtchn_fail; 1926d634bf2cSWei Liu 19272688fcb7SAndrew J. Bennieston snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 19282688fcb7SAndrew J. Bennieston "%s-tx", queue->name); 1929b27d4795SJuergen Gross err = bind_evtchn_to_irqhandler_lateeoi(queue->tx_evtchn, 1930b27d4795SJuergen Gross xennet_tx_interrupt, 0, 1931b27d4795SJuergen Gross queue->tx_irq_name, queue); 1932d634bf2cSWei Liu if (err < 0) 1933d634bf2cSWei Liu goto bind_tx_fail; 19342688fcb7SAndrew J. Bennieston queue->tx_irq = err; 1935d634bf2cSWei Liu 19362688fcb7SAndrew J. Bennieston snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 19372688fcb7SAndrew J. Bennieston "%s-rx", queue->name); 1938b27d4795SJuergen Gross err = bind_evtchn_to_irqhandler_lateeoi(queue->rx_evtchn, 1939b27d4795SJuergen Gross xennet_rx_interrupt, 0, 1940b27d4795SJuergen Gross queue->rx_irq_name, queue); 1941d634bf2cSWei Liu if (err < 0) 1942d634bf2cSWei Liu goto bind_rx_fail; 19432688fcb7SAndrew J. Bennieston queue->rx_irq = err; 1944d634bf2cSWei Liu 1945d634bf2cSWei Liu return 0; 1946d634bf2cSWei Liu 1947d634bf2cSWei Liu bind_rx_fail: 19482688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 19492688fcb7SAndrew J. Bennieston queue->tx_irq = 0; 1950d634bf2cSWei Liu bind_tx_fail: 19512688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); 19522688fcb7SAndrew J. Bennieston queue->rx_evtchn = 0; 1953d634bf2cSWei Liu alloc_rx_evtchn_fail: 19542688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 19552688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1956d634bf2cSWei Liu fail: 1957d634bf2cSWei Liu return err; 1958d634bf2cSWei Liu } 1959d634bf2cSWei Liu 19602688fcb7SAndrew J. Bennieston static int setup_netfront(struct xenbus_device *dev, 19612688fcb7SAndrew J. Bennieston struct netfront_queue *queue, unsigned int feature_split_evtchn) 19620d160211SJeremy Fitzhardinge { 19630d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 196446e20d43SJuergen Gross struct xen_netif_rx_sring *rxs; 19650d160211SJeremy Fitzhardinge int err; 19660d160211SJeremy Fitzhardinge 1967145daab2SJuergen Gross queue->tx_ring_ref = INVALID_GRANT_REF; 1968145daab2SJuergen Gross queue->rx_ring_ref = INVALID_GRANT_REF; 19692688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 19702688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 19710d160211SJeremy Fitzhardinge 197246e20d43SJuergen Gross err = xenbus_setup_ring(dev, GFP_NOIO | __GFP_HIGH, (void **)&txs, 197346e20d43SJuergen Gross 1, &queue->tx_ring_ref); 197446e20d43SJuergen Gross if (err) 19750d160211SJeremy Fitzhardinge goto fail; 19760d160211SJeremy Fitzhardinge 197746e20d43SJuergen Gross XEN_FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); 19780d160211SJeremy Fitzhardinge 197946e20d43SJuergen Gross err = xenbus_setup_ring(dev, GFP_NOIO | __GFP_HIGH, (void **)&rxs, 198046e20d43SJuergen Gross 1, &queue->rx_ring_ref); 198146e20d43SJuergen Gross if (err) 198266e3531bSJuergen Gross goto fail; 19830d160211SJeremy Fitzhardinge 198446e20d43SJuergen Gross XEN_FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); 19850d160211SJeremy Fitzhardinge 1986d634bf2cSWei Liu if (feature_split_evtchn) 19872688fcb7SAndrew J. Bennieston err = setup_netfront_split(queue); 1988d634bf2cSWei Liu /* setup single event channel if 1989d634bf2cSWei Liu * a) feature-split-event-channels == 0 1990d634bf2cSWei Liu * b) feature-split-event-channels == 1 but failed to setup 1991d634bf2cSWei Liu */ 1992e93fac3bSJiapeng Chong if (!feature_split_evtchn || err) 19932688fcb7SAndrew J. Bennieston err = setup_netfront_single(queue); 1994d634bf2cSWei Liu 19950d160211SJeremy Fitzhardinge if (err) 199666e3531bSJuergen Gross goto fail; 19970d160211SJeremy Fitzhardinge 19980d160211SJeremy Fitzhardinge return 0; 19990d160211SJeremy Fitzhardinge 20000d160211SJeremy Fitzhardinge fail: 200146e20d43SJuergen Gross xenbus_teardown_ring((void **)&queue->rx.sring, 1, &queue->rx_ring_ref); 200246e20d43SJuergen Gross xenbus_teardown_ring((void **)&queue->tx.sring, 1, &queue->tx_ring_ref); 200346e20d43SJuergen Gross 20040d160211SJeremy Fitzhardinge return err; 20050d160211SJeremy Fitzhardinge } 20060d160211SJeremy Fitzhardinge 20072688fcb7SAndrew J. Bennieston /* Queue-specific initialisation 20082688fcb7SAndrew J. Bennieston * This used to be done in xennet_create_dev() but must now 20092688fcb7SAndrew J. Bennieston * be run per-queue. 20102688fcb7SAndrew J. Bennieston */ 20112688fcb7SAndrew J. Bennieston static int xennet_init_queue(struct netfront_queue *queue) 20122688fcb7SAndrew J. Bennieston { 20132688fcb7SAndrew J. Bennieston unsigned short i; 20142688fcb7SAndrew J. Bennieston int err = 0; 201521f2706bSXiao Liang char *devid; 20162688fcb7SAndrew J. Bennieston 20172688fcb7SAndrew J. Bennieston spin_lock_init(&queue->tx_lock); 20182688fcb7SAndrew J. Bennieston spin_lock_init(&queue->rx_lock); 2019b27d4795SJuergen Gross spin_lock_init(&queue->rx_cons_lock); 20202688fcb7SAndrew J. Bennieston 2021e99e88a9SKees Cook timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0); 20222688fcb7SAndrew J. Bennieston 202321f2706bSXiao Liang devid = strrchr(queue->info->xbdev->nodename, '/') + 1; 202421f2706bSXiao Liang snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", 202521f2706bSXiao Liang devid, queue->id); 20268b715010SWei Liu 202721631d2dSJuergen Gross /* Initialise tx_skb_freelist as a free chain containing every entry. */ 20282688fcb7SAndrew J. Bennieston queue->tx_skb_freelist = 0; 2029a884daa6SJuergen Gross queue->tx_pend_queue = TX_LINK_NONE; 20302688fcb7SAndrew J. Bennieston for (i = 0; i < NET_TX_RING_SIZE; i++) { 203121631d2dSJuergen Gross queue->tx_link[i] = i + 1; 2032145daab2SJuergen Gross queue->grant_tx_ref[i] = INVALID_GRANT_REF; 20332688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 20342688fcb7SAndrew J. Bennieston } 203521631d2dSJuergen Gross queue->tx_link[NET_TX_RING_SIZE - 1] = TX_LINK_NONE; 20362688fcb7SAndrew J. Bennieston 20372688fcb7SAndrew J. Bennieston /* Clear out rx_skbs */ 20382688fcb7SAndrew J. Bennieston for (i = 0; i < NET_RX_RING_SIZE; i++) { 20392688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 2040145daab2SJuergen Gross queue->grant_rx_ref[i] = INVALID_GRANT_REF; 20412688fcb7SAndrew J. Bennieston } 20422688fcb7SAndrew J. Bennieston 20432688fcb7SAndrew J. Bennieston /* A grant for every tx ring slot */ 20441f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, 20452688fcb7SAndrew J. Bennieston &queue->gref_tx_head) < 0) { 20462688fcb7SAndrew J. Bennieston pr_alert("can't alloc tx grant refs\n"); 20472688fcb7SAndrew J. Bennieston err = -ENOMEM; 20482688fcb7SAndrew J. Bennieston goto exit; 20492688fcb7SAndrew J. Bennieston } 20502688fcb7SAndrew J. Bennieston 20512688fcb7SAndrew J. Bennieston /* A grant for every rx ring slot */ 20521f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, 20532688fcb7SAndrew J. Bennieston &queue->gref_rx_head) < 0) { 20542688fcb7SAndrew J. Bennieston pr_alert("can't alloc rx grant refs\n"); 20552688fcb7SAndrew J. Bennieston err = -ENOMEM; 20562688fcb7SAndrew J. Bennieston goto exit_free_tx; 20572688fcb7SAndrew J. Bennieston } 20582688fcb7SAndrew J. Bennieston 20592688fcb7SAndrew J. Bennieston return 0; 20602688fcb7SAndrew J. Bennieston 20612688fcb7SAndrew J. Bennieston exit_free_tx: 20622688fcb7SAndrew J. Bennieston gnttab_free_grant_references(queue->gref_tx_head); 20632688fcb7SAndrew J. Bennieston exit: 20642688fcb7SAndrew J. Bennieston return err; 20652688fcb7SAndrew J. Bennieston } 20662688fcb7SAndrew J. Bennieston 206750ee6061SAndrew J. Bennieston static int write_queue_xenstore_keys(struct netfront_queue *queue, 206850ee6061SAndrew J. Bennieston struct xenbus_transaction *xbt, int write_hierarchical) 206950ee6061SAndrew J. Bennieston { 207050ee6061SAndrew J. Bennieston /* Write the queue-specific keys into XenStore in the traditional 207150ee6061SAndrew J. Bennieston * way for a single queue, or in a queue subkeys for multiple 207250ee6061SAndrew J. Bennieston * queues. 207350ee6061SAndrew J. Bennieston */ 207450ee6061SAndrew J. Bennieston struct xenbus_device *dev = queue->info->xbdev; 207550ee6061SAndrew J. Bennieston int err; 207650ee6061SAndrew J. Bennieston const char *message; 207750ee6061SAndrew J. Bennieston char *path; 207850ee6061SAndrew J. Bennieston size_t pathsize; 207950ee6061SAndrew J. Bennieston 208050ee6061SAndrew J. Bennieston /* Choose the correct place to write the keys */ 208150ee6061SAndrew J. Bennieston if (write_hierarchical) { 208250ee6061SAndrew J. Bennieston pathsize = strlen(dev->nodename) + 10; 208350ee6061SAndrew J. Bennieston path = kzalloc(pathsize, GFP_KERNEL); 208450ee6061SAndrew J. Bennieston if (!path) { 208550ee6061SAndrew J. Bennieston err = -ENOMEM; 208650ee6061SAndrew J. Bennieston message = "out of memory while writing ring references"; 208750ee6061SAndrew J. Bennieston goto error; 208850ee6061SAndrew J. Bennieston } 208950ee6061SAndrew J. Bennieston snprintf(path, pathsize, "%s/queue-%u", 209050ee6061SAndrew J. Bennieston dev->nodename, queue->id); 209150ee6061SAndrew J. Bennieston } else { 209250ee6061SAndrew J. Bennieston path = (char *)dev->nodename; 209350ee6061SAndrew J. Bennieston } 209450ee6061SAndrew J. Bennieston 209550ee6061SAndrew J. Bennieston /* Write ring references */ 209650ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", 209750ee6061SAndrew J. Bennieston queue->tx_ring_ref); 209850ee6061SAndrew J. Bennieston if (err) { 209950ee6061SAndrew J. Bennieston message = "writing tx-ring-ref"; 210050ee6061SAndrew J. Bennieston goto error; 210150ee6061SAndrew J. Bennieston } 210250ee6061SAndrew J. Bennieston 210350ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", 210450ee6061SAndrew J. Bennieston queue->rx_ring_ref); 210550ee6061SAndrew J. Bennieston if (err) { 210650ee6061SAndrew J. Bennieston message = "writing rx-ring-ref"; 210750ee6061SAndrew J. Bennieston goto error; 210850ee6061SAndrew J. Bennieston } 210950ee6061SAndrew J. Bennieston 211050ee6061SAndrew J. Bennieston /* Write event channels; taking into account both shared 211150ee6061SAndrew J. Bennieston * and split event channel scenarios. 211250ee6061SAndrew J. Bennieston */ 211350ee6061SAndrew J. Bennieston if (queue->tx_evtchn == queue->rx_evtchn) { 211450ee6061SAndrew J. Bennieston /* Shared event channel */ 211550ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 211650ee6061SAndrew J. Bennieston "event-channel", "%u", queue->tx_evtchn); 211750ee6061SAndrew J. Bennieston if (err) { 211850ee6061SAndrew J. Bennieston message = "writing event-channel"; 211950ee6061SAndrew J. Bennieston goto error; 212050ee6061SAndrew J. Bennieston } 212150ee6061SAndrew J. Bennieston } else { 212250ee6061SAndrew J. Bennieston /* Split event channels */ 212350ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 212450ee6061SAndrew J. Bennieston "event-channel-tx", "%u", queue->tx_evtchn); 212550ee6061SAndrew J. Bennieston if (err) { 212650ee6061SAndrew J. Bennieston message = "writing event-channel-tx"; 212750ee6061SAndrew J. Bennieston goto error; 212850ee6061SAndrew J. Bennieston } 212950ee6061SAndrew J. Bennieston 213050ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 213150ee6061SAndrew J. Bennieston "event-channel-rx", "%u", queue->rx_evtchn); 213250ee6061SAndrew J. Bennieston if (err) { 213350ee6061SAndrew J. Bennieston message = "writing event-channel-rx"; 213450ee6061SAndrew J. Bennieston goto error; 213550ee6061SAndrew J. Bennieston } 213650ee6061SAndrew J. Bennieston } 213750ee6061SAndrew J. Bennieston 213850ee6061SAndrew J. Bennieston if (write_hierarchical) 213950ee6061SAndrew J. Bennieston kfree(path); 214050ee6061SAndrew J. Bennieston return 0; 214150ee6061SAndrew J. Bennieston 214250ee6061SAndrew J. Bennieston error: 214350ee6061SAndrew J. Bennieston if (write_hierarchical) 214450ee6061SAndrew J. Bennieston kfree(path); 214550ee6061SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "%s", message); 214650ee6061SAndrew J. Bennieston return err; 214750ee6061SAndrew J. Bennieston } 214850ee6061SAndrew J. Bennieston 21496c5aa6fcSDenis Kirjanov 21506c5aa6fcSDenis Kirjanov 21516c5aa6fcSDenis Kirjanov static int xennet_create_page_pool(struct netfront_queue *queue) 21526c5aa6fcSDenis Kirjanov { 21536c5aa6fcSDenis Kirjanov int err; 21546c5aa6fcSDenis Kirjanov struct page_pool_params pp_params = { 21556c5aa6fcSDenis Kirjanov .order = 0, 21566c5aa6fcSDenis Kirjanov .flags = 0, 21576c5aa6fcSDenis Kirjanov .pool_size = NET_RX_RING_SIZE, 21586c5aa6fcSDenis Kirjanov .nid = NUMA_NO_NODE, 21596c5aa6fcSDenis Kirjanov .dev = &queue->info->netdev->dev, 21606c5aa6fcSDenis Kirjanov .offset = XDP_PACKET_HEADROOM, 21616c5aa6fcSDenis Kirjanov .max_len = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, 21626c5aa6fcSDenis Kirjanov }; 21636c5aa6fcSDenis Kirjanov 21646c5aa6fcSDenis Kirjanov queue->page_pool = page_pool_create(&pp_params); 21656c5aa6fcSDenis Kirjanov if (IS_ERR(queue->page_pool)) { 21666c5aa6fcSDenis Kirjanov err = PTR_ERR(queue->page_pool); 21676c5aa6fcSDenis Kirjanov queue->page_pool = NULL; 21686c5aa6fcSDenis Kirjanov return err; 21696c5aa6fcSDenis Kirjanov } 21706c5aa6fcSDenis Kirjanov 21716c5aa6fcSDenis Kirjanov err = xdp_rxq_info_reg(&queue->xdp_rxq, queue->info->netdev, 2172b02e5a0eSBjörn Töpel queue->id, 0); 21736c5aa6fcSDenis Kirjanov if (err) { 21746c5aa6fcSDenis Kirjanov netdev_err(queue->info->netdev, "xdp_rxq_info_reg failed\n"); 21756c5aa6fcSDenis Kirjanov goto err_free_pp; 21766c5aa6fcSDenis Kirjanov } 21776c5aa6fcSDenis Kirjanov 21786c5aa6fcSDenis Kirjanov err = xdp_rxq_info_reg_mem_model(&queue->xdp_rxq, 21796c5aa6fcSDenis Kirjanov MEM_TYPE_PAGE_POOL, queue->page_pool); 21806c5aa6fcSDenis Kirjanov if (err) { 21816c5aa6fcSDenis Kirjanov netdev_err(queue->info->netdev, "xdp_rxq_info_reg_mem_model failed\n"); 21826c5aa6fcSDenis Kirjanov goto err_unregister_rxq; 21836c5aa6fcSDenis Kirjanov } 21846c5aa6fcSDenis Kirjanov return 0; 21856c5aa6fcSDenis Kirjanov 21866c5aa6fcSDenis Kirjanov err_unregister_rxq: 21876c5aa6fcSDenis Kirjanov xdp_rxq_info_unreg(&queue->xdp_rxq); 21886c5aa6fcSDenis Kirjanov err_free_pp: 21896c5aa6fcSDenis Kirjanov page_pool_destroy(queue->page_pool); 21906c5aa6fcSDenis Kirjanov queue->page_pool = NULL; 21916c5aa6fcSDenis Kirjanov return err; 21926c5aa6fcSDenis Kirjanov } 21936c5aa6fcSDenis Kirjanov 2194ce58725fSDavid Vrabel static int xennet_create_queues(struct netfront_info *info, 2195ca88ea12SJoe Jin unsigned int *num_queues) 2196ce58725fSDavid Vrabel { 2197ce58725fSDavid Vrabel unsigned int i; 2198ce58725fSDavid Vrabel int ret; 2199ce58725fSDavid Vrabel 2200ca88ea12SJoe Jin info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), 2201ce58725fSDavid Vrabel GFP_KERNEL); 2202ce58725fSDavid Vrabel if (!info->queues) 2203ce58725fSDavid Vrabel return -ENOMEM; 2204ce58725fSDavid Vrabel 2205ca88ea12SJoe Jin for (i = 0; i < *num_queues; i++) { 2206ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 2207ce58725fSDavid Vrabel 2208ce58725fSDavid Vrabel queue->id = i; 2209ce58725fSDavid Vrabel queue->info = info; 2210ce58725fSDavid Vrabel 2211ce58725fSDavid Vrabel ret = xennet_init_queue(queue); 2212ce58725fSDavid Vrabel if (ret < 0) { 2213f599c64fSRoss Lagerwall dev_warn(&info->xbdev->dev, 221469cb8524SDavid Vrabel "only created %d queues\n", i); 2215ca88ea12SJoe Jin *num_queues = i; 2216ce58725fSDavid Vrabel break; 2217ce58725fSDavid Vrabel } 2218ce58725fSDavid Vrabel 22196c5aa6fcSDenis Kirjanov /* use page pool recycling instead of buddy allocator */ 22206c5aa6fcSDenis Kirjanov ret = xennet_create_page_pool(queue); 22216c5aa6fcSDenis Kirjanov if (ret < 0) { 22226c5aa6fcSDenis Kirjanov dev_err(&info->xbdev->dev, "can't allocate page pool\n"); 22236c5aa6fcSDenis Kirjanov *num_queues = i; 22246c5aa6fcSDenis Kirjanov return ret; 22256c5aa6fcSDenis Kirjanov } 22266c5aa6fcSDenis Kirjanov 2227b48b89f9SJakub Kicinski netif_napi_add(queue->info->netdev, &queue->napi, xennet_poll); 2228ce58725fSDavid Vrabel if (netif_running(info->netdev)) 2229ce58725fSDavid Vrabel napi_enable(&queue->napi); 2230ce58725fSDavid Vrabel } 2231ce58725fSDavid Vrabel 2232ca88ea12SJoe Jin netif_set_real_num_tx_queues(info->netdev, *num_queues); 2233ce58725fSDavid Vrabel 2234ca88ea12SJoe Jin if (*num_queues == 0) { 2235f599c64fSRoss Lagerwall dev_err(&info->xbdev->dev, "no queues\n"); 2236ce58725fSDavid Vrabel return -EINVAL; 2237ce58725fSDavid Vrabel } 2238ce58725fSDavid Vrabel return 0; 2239ce58725fSDavid Vrabel } 2240ce58725fSDavid Vrabel 22410d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 2242f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 22430d160211SJeremy Fitzhardinge struct netfront_info *info) 22440d160211SJeremy Fitzhardinge { 22450d160211SJeremy Fitzhardinge const char *message; 22460d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 22470d160211SJeremy Fitzhardinge int err; 22482688fcb7SAndrew J. Bennieston unsigned int feature_split_evtchn; 22492688fcb7SAndrew J. Bennieston unsigned int i = 0; 225050ee6061SAndrew J. Bennieston unsigned int max_queues = 0; 22512688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 22522688fcb7SAndrew J. Bennieston unsigned int num_queues = 1; 225393772114SJakub Kicinski u8 addr[ETH_ALEN]; 22540d160211SJeremy Fitzhardinge 22552688fcb7SAndrew J. Bennieston info->netdev->irq = 0; 22562688fcb7SAndrew J. Bennieston 22574491001cSRoger Pau Monne /* Check if backend is trusted. */ 22584491001cSRoger Pau Monne info->bounce = !xennet_trusted || 22594491001cSRoger Pau Monne !xenbus_read_unsigned(dev->nodename, "trusted", 1); 22604491001cSRoger Pau Monne 226150ee6061SAndrew J. Bennieston /* Check if backend supports multiple queues */ 22622890ea5cSJuergen Gross max_queues = xenbus_read_unsigned(info->xbdev->otherend, 22632890ea5cSJuergen Gross "multi-queue-max-queues", 1); 226450ee6061SAndrew J. Bennieston num_queues = min(max_queues, xennet_max_queues); 226550ee6061SAndrew J. Bennieston 22662688fcb7SAndrew J. Bennieston /* Check feature-split-event-channels */ 22672890ea5cSJuergen Gross feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, 22682890ea5cSJuergen Gross "feature-split-event-channels", 0); 22692688fcb7SAndrew J. Bennieston 22702688fcb7SAndrew J. Bennieston /* Read mac addr. */ 227193772114SJakub Kicinski err = xen_net_read_mac(dev, addr); 22722688fcb7SAndrew J. Bennieston if (err) { 22732688fcb7SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 2274cb257783SRoss Lagerwall goto out_unlocked; 22752688fcb7SAndrew J. Bennieston } 227693772114SJakub Kicinski eth_hw_addr_set(info->netdev, addr); 22772688fcb7SAndrew J. Bennieston 22786c5aa6fcSDenis Kirjanov info->netback_has_xdp_headroom = xenbus_read_unsigned(info->xbdev->otherend, 22796c5aa6fcSDenis Kirjanov "feature-xdp-headroom", 0); 22806c5aa6fcSDenis Kirjanov if (info->netback_has_xdp_headroom) { 22816c5aa6fcSDenis Kirjanov /* set the current xen-netfront xdp state */ 22826c5aa6fcSDenis Kirjanov err = talk_to_netback_xdp(info, info->netfront_xdp_enabled ? 22836c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_ENABLE : 22846c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_DISABLE); 22856c5aa6fcSDenis Kirjanov if (err) 22866c5aa6fcSDenis Kirjanov goto out_unlocked; 22876c5aa6fcSDenis Kirjanov } 22886c5aa6fcSDenis Kirjanov 2289f599c64fSRoss Lagerwall rtnl_lock(); 2290ce58725fSDavid Vrabel if (info->queues) 2291ce58725fSDavid Vrabel xennet_destroy_queues(info); 2292ce58725fSDavid Vrabel 2293a884daa6SJuergen Gross /* For the case of a reconnect reset the "broken" indicator. */ 2294a884daa6SJuergen Gross info->broken = false; 2295a884daa6SJuergen Gross 2296ca88ea12SJoe Jin err = xennet_create_queues(info, &num_queues); 2297e2e004acSRoss Lagerwall if (err < 0) { 2298e2e004acSRoss Lagerwall xenbus_dev_fatal(dev, err, "creating queues"); 2299e2e004acSRoss Lagerwall kfree(info->queues); 2300e2e004acSRoss Lagerwall info->queues = NULL; 2301e2e004acSRoss Lagerwall goto out; 2302e2e004acSRoss Lagerwall } 2303f599c64fSRoss Lagerwall rtnl_unlock(); 23042688fcb7SAndrew J. Bennieston 23052688fcb7SAndrew J. Bennieston /* Create shared ring, alloc event channel -- for each queue */ 23062688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 23072688fcb7SAndrew J. Bennieston queue = &info->queues[i]; 23082688fcb7SAndrew J. Bennieston err = setup_netfront(dev, queue, feature_split_evtchn); 2309e2e004acSRoss Lagerwall if (err) 23102688fcb7SAndrew J. Bennieston goto destroy_ring; 23112688fcb7SAndrew J. Bennieston } 23120d160211SJeremy Fitzhardinge 23130d160211SJeremy Fitzhardinge again: 23140d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 23150d160211SJeremy Fitzhardinge if (err) { 23160d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 23170d160211SJeremy Fitzhardinge goto destroy_ring; 23180d160211SJeremy Fitzhardinge } 23190d160211SJeremy Fitzhardinge 2320812494d9Schas williams if (xenbus_exists(XBT_NIL, 2321812494d9Schas williams info->xbdev->otherend, "multi-queue-max-queues")) { 2322812494d9Schas williams /* Write the number of queues */ 2323812494d9Schas williams err = xenbus_printf(xbt, dev->nodename, 2324812494d9Schas williams "multi-queue-num-queues", "%u", num_queues); 2325812494d9Schas williams if (err) { 2326812494d9Schas williams message = "writing multi-queue-num-queues"; 2327812494d9Schas williams goto abort_transaction_no_dev_fatal; 2328812494d9Schas williams } 2329812494d9Schas williams } 2330812494d9Schas williams 233150ee6061SAndrew J. Bennieston if (num_queues == 1) { 233250ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ 233350ee6061SAndrew J. Bennieston if (err) 233450ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 2335d634bf2cSWei Liu } else { 233650ee6061SAndrew J. Bennieston /* Write the keys for each queue */ 233750ee6061SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 233850ee6061SAndrew J. Bennieston queue = &info->queues[i]; 233950ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ 234050ee6061SAndrew J. Bennieston if (err) 234150ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 2342d634bf2cSWei Liu } 2343d634bf2cSWei Liu } 23440d160211SJeremy Fitzhardinge 234550ee6061SAndrew J. Bennieston /* The remaining keys are not queue-specific */ 23460d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 23470d160211SJeremy Fitzhardinge 1); 23480d160211SJeremy Fitzhardinge if (err) { 23490d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 23500d160211SJeremy Fitzhardinge goto abort_transaction; 23510d160211SJeremy Fitzhardinge } 23520d160211SJeremy Fitzhardinge 23530d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 23540d160211SJeremy Fitzhardinge if (err) { 23550d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 23560d160211SJeremy Fitzhardinge goto abort_transaction; 23570d160211SJeremy Fitzhardinge } 23580d160211SJeremy Fitzhardinge 23590d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 23600d160211SJeremy Fitzhardinge if (err) { 23610d160211SJeremy Fitzhardinge message = "writing feature-sg"; 23620d160211SJeremy Fitzhardinge goto abort_transaction; 23630d160211SJeremy Fitzhardinge } 23640d160211SJeremy Fitzhardinge 23650d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 23660d160211SJeremy Fitzhardinge if (err) { 23670d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 23680d160211SJeremy Fitzhardinge goto abort_transaction; 23690d160211SJeremy Fitzhardinge } 23700d160211SJeremy Fitzhardinge 23712c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); 23722c0057deSPaul Durrant if (err) { 23732c0057deSPaul Durrant message = "writing feature-gso-tcpv6"; 23742c0057deSPaul Durrant goto abort_transaction; 23752c0057deSPaul Durrant } 23762c0057deSPaul Durrant 23772c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", 23782c0057deSPaul Durrant "1"); 23792c0057deSPaul Durrant if (err) { 23802c0057deSPaul Durrant message = "writing feature-ipv6-csum-offload"; 23812c0057deSPaul Durrant goto abort_transaction; 23822c0057deSPaul Durrant } 23832c0057deSPaul Durrant 23840d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 23850d160211SJeremy Fitzhardinge if (err) { 23860d160211SJeremy Fitzhardinge if (err == -EAGAIN) 23870d160211SJeremy Fitzhardinge goto again; 23880d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 23890d160211SJeremy Fitzhardinge goto destroy_ring; 23900d160211SJeremy Fitzhardinge } 23910d160211SJeremy Fitzhardinge 23920d160211SJeremy Fitzhardinge return 0; 23930d160211SJeremy Fitzhardinge 23940d160211SJeremy Fitzhardinge abort_transaction: 23950d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 239650ee6061SAndrew J. Bennieston abort_transaction_no_dev_fatal: 239750ee6061SAndrew J. Bennieston xenbus_transaction_end(xbt, 1); 23980d160211SJeremy Fitzhardinge destroy_ring: 23990d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 2400f599c64fSRoss Lagerwall rtnl_lock(); 2401e2e004acSRoss Lagerwall xennet_destroy_queues(info); 24020d160211SJeremy Fitzhardinge out: 2403f599c64fSRoss Lagerwall rtnl_unlock(); 2404cb257783SRoss Lagerwall out_unlocked: 2405d86b5672SVitaly Kuznetsov device_unregister(&dev->dev); 24060d160211SJeremy Fitzhardinge return err; 24070d160211SJeremy Fitzhardinge } 24080d160211SJeremy Fitzhardinge 24090d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 24100d160211SJeremy Fitzhardinge { 24110d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 24122688fcb7SAndrew J. Bennieston unsigned int num_queues = 0; 2413a5b5dc3cSDavid Vrabel int err; 24142688fcb7SAndrew J. Bennieston unsigned int j = 0; 24152688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 24160d160211SJeremy Fitzhardinge 24172890ea5cSJuergen Gross if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { 24180d160211SJeremy Fitzhardinge dev_info(&dev->dev, 2419898eb71cSJoe Perches "backend does not support copying receive path\n"); 24200d160211SJeremy Fitzhardinge return -ENODEV; 24210d160211SJeremy Fitzhardinge } 24220d160211SJeremy Fitzhardinge 2423f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 24240d160211SJeremy Fitzhardinge if (err) 24250d160211SJeremy Fitzhardinge return err; 24266c5aa6fcSDenis Kirjanov if (np->netback_has_xdp_headroom) 24276c5aa6fcSDenis Kirjanov pr_info("backend supports XDP headroom\n"); 24284491001cSRoger Pau Monne if (np->bounce) 24294491001cSRoger Pau Monne dev_info(&np->xbdev->dev, 24304491001cSRoger Pau Monne "bouncing transmitted data to zeroed pages\n"); 24310d160211SJeremy Fitzhardinge 24322688fcb7SAndrew J. Bennieston /* talk_to_netback() sets the correct number of queues */ 24332688fcb7SAndrew J. Bennieston num_queues = dev->real_num_tx_queues; 24342688fcb7SAndrew J. Bennieston 2435f599c64fSRoss Lagerwall if (dev->reg_state == NETREG_UNINITIALIZED) { 2436f599c64fSRoss Lagerwall err = register_netdev(dev); 2437f599c64fSRoss Lagerwall if (err) { 2438f599c64fSRoss Lagerwall pr_warn("%s: register_netdev err=%d\n", __func__, err); 2439f599c64fSRoss Lagerwall device_unregister(&np->xbdev->dev); 2440f599c64fSRoss Lagerwall return err; 2441f599c64fSRoss Lagerwall } 2442f599c64fSRoss Lagerwall } 2443f599c64fSRoss Lagerwall 244445c8184cSRoss Lagerwall rtnl_lock(); 244545c8184cSRoss Lagerwall netdev_update_features(dev); 244645c8184cSRoss Lagerwall rtnl_unlock(); 244745c8184cSRoss Lagerwall 24480d160211SJeremy Fitzhardinge /* 2449a5b5dc3cSDavid Vrabel * All public and private state should now be sane. Get 24500d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 24510d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 24520d160211SJeremy Fitzhardinge * packets. 24530d160211SJeremy Fitzhardinge */ 2454042b2046SDongli Zhang netif_tx_lock_bh(np->netdev); 2455042b2046SDongli Zhang netif_device_attach(np->netdev); 2456042b2046SDongli Zhang netif_tx_unlock_bh(np->netdev); 2457042b2046SDongli Zhang 24580d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 24592688fcb7SAndrew J. Bennieston for (j = 0; j < num_queues; ++j) { 24602688fcb7SAndrew J. Bennieston queue = &np->queues[j]; 2461f50b4076SDavid Vrabel 24622688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 24632688fcb7SAndrew J. Bennieston if (queue->tx_irq != queue->rx_irq) 24642688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 24650d160211SJeremy Fitzhardinge 2466f50b4076SDavid Vrabel spin_lock_bh(&queue->rx_lock); 2467f50b4076SDavid Vrabel xennet_alloc_rx_buffers(queue); 24682688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 24692688fcb7SAndrew J. Bennieston } 24700d160211SJeremy Fitzhardinge 24710d160211SJeremy Fitzhardinge return 0; 24720d160211SJeremy Fitzhardinge } 24730d160211SJeremy Fitzhardinge 247480708602SLee Jones /* 24750d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 24760d160211SJeremy Fitzhardinge */ 2477f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 24780d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 24790d160211SJeremy Fitzhardinge { 24801b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 24810d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 24820d160211SJeremy Fitzhardinge 24830d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 24840d160211SJeremy Fitzhardinge 24858edfe2e9SJuergen Gross wake_up_all(&module_wq); 24868edfe2e9SJuergen Gross 24870d160211SJeremy Fitzhardinge switch (backend_state) { 24880d160211SJeremy Fitzhardinge case XenbusStateInitialising: 24890d160211SJeremy Fitzhardinge case XenbusStateInitialised: 2490b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 2491b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 24920d160211SJeremy Fitzhardinge case XenbusStateUnknown: 24930d160211SJeremy Fitzhardinge break; 24940d160211SJeremy Fitzhardinge 24950d160211SJeremy Fitzhardinge case XenbusStateInitWait: 24960d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 24970d160211SJeremy Fitzhardinge break; 24980d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 24990d160211SJeremy Fitzhardinge break; 25000d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 250108e34eb1SLaszlo Ersek break; 250208e34eb1SLaszlo Ersek 250308e34eb1SLaszlo Ersek case XenbusStateConnected: 2504ee89bab1SAmerigo Wang netdev_notify_peers(netdev); 25050d160211SJeremy Fitzhardinge break; 25060d160211SJeremy Fitzhardinge 2507bce3ea81SDavid Vrabel case XenbusStateClosed: 2508bce3ea81SDavid Vrabel if (dev->state == XenbusStateClosed) 2509bce3ea81SDavid Vrabel break; 2510df561f66SGustavo A. R. Silva fallthrough; /* Missed the backend's CLOSING state */ 25110d160211SJeremy Fitzhardinge case XenbusStateClosing: 25120d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 25130d160211SJeremy Fitzhardinge break; 25140d160211SJeremy Fitzhardinge } 25150d160211SJeremy Fitzhardinge } 25160d160211SJeremy Fitzhardinge 2517e0ce4af9SIan Campbell static const struct xennet_stat { 2518e0ce4af9SIan Campbell char name[ETH_GSTRING_LEN]; 2519e0ce4af9SIan Campbell u16 offset; 2520e0ce4af9SIan Campbell } xennet_stats[] = { 2521e0ce4af9SIan Campbell { 2522e0ce4af9SIan Campbell "rx_gso_checksum_fixup", 2523e0ce4af9SIan Campbell offsetof(struct netfront_info, rx_gso_checksum_fixup) 2524e0ce4af9SIan Campbell }, 2525e0ce4af9SIan Campbell }; 2526e0ce4af9SIan Campbell 2527e0ce4af9SIan Campbell static int xennet_get_sset_count(struct net_device *dev, int string_set) 2528e0ce4af9SIan Campbell { 2529e0ce4af9SIan Campbell switch (string_set) { 2530e0ce4af9SIan Campbell case ETH_SS_STATS: 2531e0ce4af9SIan Campbell return ARRAY_SIZE(xennet_stats); 2532e0ce4af9SIan Campbell default: 2533e0ce4af9SIan Campbell return -EINVAL; 2534e0ce4af9SIan Campbell } 2535e0ce4af9SIan Campbell } 2536e0ce4af9SIan Campbell 2537e0ce4af9SIan Campbell static void xennet_get_ethtool_stats(struct net_device *dev, 2538e0ce4af9SIan Campbell struct ethtool_stats *stats, u64 * data) 2539e0ce4af9SIan Campbell { 2540e0ce4af9SIan Campbell void *np = netdev_priv(dev); 2541e0ce4af9SIan Campbell int i; 2542e0ce4af9SIan Campbell 2543e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 25442688fcb7SAndrew J. Bennieston data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); 2545e0ce4af9SIan Campbell } 2546e0ce4af9SIan Campbell 2547e0ce4af9SIan Campbell static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) 2548e0ce4af9SIan Campbell { 2549e0ce4af9SIan Campbell int i; 2550e0ce4af9SIan Campbell 2551e0ce4af9SIan Campbell switch (stringset) { 2552e0ce4af9SIan Campbell case ETH_SS_STATS: 2553e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 2554e0ce4af9SIan Campbell memcpy(data + i * ETH_GSTRING_LEN, 2555e0ce4af9SIan Campbell xennet_stats[i].name, ETH_GSTRING_LEN); 2556e0ce4af9SIan Campbell break; 2557e0ce4af9SIan Campbell } 2558e0ce4af9SIan Campbell } 2559e0ce4af9SIan Campbell 25600fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 25610d160211SJeremy Fitzhardinge { 25620d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 2563e0ce4af9SIan Campbell 2564e0ce4af9SIan Campbell .get_sset_count = xennet_get_sset_count, 2565e0ce4af9SIan Campbell .get_ethtool_stats = xennet_get_ethtool_stats, 2566e0ce4af9SIan Campbell .get_strings = xennet_get_strings, 256791ffb9d3SDaniel Drown .get_ts_info = ethtool_op_get_ts_info, 25680d160211SJeremy Fitzhardinge }; 25690d160211SJeremy Fitzhardinge 25700d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 25711f3c2ebaSDavid Vrabel static ssize_t show_rxbuf(struct device *dev, 25720d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 25730d160211SJeremy Fitzhardinge { 25741f3c2ebaSDavid Vrabel return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); 25750d160211SJeremy Fitzhardinge } 25760d160211SJeremy Fitzhardinge 25771f3c2ebaSDavid Vrabel static ssize_t store_rxbuf(struct device *dev, 25780d160211SJeremy Fitzhardinge struct device_attribute *attr, 25790d160211SJeremy Fitzhardinge const char *buf, size_t len) 25800d160211SJeremy Fitzhardinge { 25810d160211SJeremy Fitzhardinge char *endp; 25820d160211SJeremy Fitzhardinge 25830d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 25840d160211SJeremy Fitzhardinge return -EPERM; 25850d160211SJeremy Fitzhardinge 25868ed7ec13SAndrew Lunn simple_strtoul(buf, &endp, 0); 25870d160211SJeremy Fitzhardinge if (endp == buf) 25880d160211SJeremy Fitzhardinge return -EBADMSG; 25890d160211SJeremy Fitzhardinge 25901f3c2ebaSDavid Vrabel /* rxbuf_min and rxbuf_max are no longer configurable. */ 25910d160211SJeremy Fitzhardinge 25920d160211SJeremy Fitzhardinge return len; 25930d160211SJeremy Fitzhardinge } 25940d160211SJeremy Fitzhardinge 2595d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf); 2596d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf); 2597d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL); 259827b917e5STakashi Iwai 259927b917e5STakashi Iwai static struct attribute *xennet_dev_attrs[] = { 260027b917e5STakashi Iwai &dev_attr_rxbuf_min.attr, 260127b917e5STakashi Iwai &dev_attr_rxbuf_max.attr, 260227b917e5STakashi Iwai &dev_attr_rxbuf_cur.attr, 260327b917e5STakashi Iwai NULL 26040d160211SJeremy Fitzhardinge }; 26050d160211SJeremy Fitzhardinge 260627b917e5STakashi Iwai static const struct attribute_group xennet_dev_group = { 260727b917e5STakashi Iwai .attrs = xennet_dev_attrs 260827b917e5STakashi Iwai }; 26090d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 26100d160211SJeremy Fitzhardinge 2611c2c63310SAndrea Righi static void xennet_bus_close(struct xenbus_device *dev) 2612c2c63310SAndrea Righi { 2613c2c63310SAndrea Righi int ret; 2614c2c63310SAndrea Righi 2615c2c63310SAndrea Righi if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) 2616c2c63310SAndrea Righi return; 2617c2c63310SAndrea Righi do { 2618c2c63310SAndrea Righi xenbus_switch_state(dev, XenbusStateClosing); 2619c2c63310SAndrea Righi ret = wait_event_timeout(module_wq, 2620c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2621c2c63310SAndrea Righi XenbusStateClosing || 2622c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2623c2c63310SAndrea Righi XenbusStateClosed || 2624c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2625c2c63310SAndrea Righi XenbusStateUnknown, 2626c2c63310SAndrea Righi XENNET_TIMEOUT); 2627c2c63310SAndrea Righi } while (!ret); 2628c2c63310SAndrea Righi 2629c2c63310SAndrea Righi if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) 2630c2c63310SAndrea Righi return; 2631c2c63310SAndrea Righi 2632c2c63310SAndrea Righi do { 2633c2c63310SAndrea Righi xenbus_switch_state(dev, XenbusStateClosed); 2634c2c63310SAndrea Righi ret = wait_event_timeout(module_wq, 2635c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2636c2c63310SAndrea Righi XenbusStateClosed || 2637c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2638c2c63310SAndrea Righi XenbusStateUnknown, 2639c2c63310SAndrea Righi XENNET_TIMEOUT); 2640c2c63310SAndrea Righi } while (!ret); 2641c2c63310SAndrea Righi } 2642c2c63310SAndrea Righi 26438e0e46bbSBill Pemberton static int xennet_remove(struct xenbus_device *dev) 26440d160211SJeremy Fitzhardinge { 26451b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 26460d160211SJeremy Fitzhardinge 2647c2c63310SAndrea Righi xennet_bus_close(dev); 26480d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 26490d160211SJeremy Fitzhardinge 2650f599c64fSRoss Lagerwall if (info->netdev->reg_state == NETREG_REGISTERED) 26516bc96d04SIan Campbell unregister_netdev(info->netdev); 26526bc96d04SIan Campbell 2653f599c64fSRoss Lagerwall if (info->queues) { 2654f599c64fSRoss Lagerwall rtnl_lock(); 2655ad068118SDavid Vrabel xennet_destroy_queues(info); 2656f599c64fSRoss Lagerwall rtnl_unlock(); 2657f599c64fSRoss Lagerwall } 2658900e1833SDavid Vrabel xennet_free_netdev(info->netdev); 26590d160211SJeremy Fitzhardinge 26600d160211SJeremy Fitzhardinge return 0; 26610d160211SJeremy Fitzhardinge } 26620d160211SJeremy Fitzhardinge 266395afae48SDavid Vrabel static const struct xenbus_device_id netfront_ids[] = { 266495afae48SDavid Vrabel { "vif" }, 266595afae48SDavid Vrabel { "" } 266695afae48SDavid Vrabel }; 266795afae48SDavid Vrabel 266895afae48SDavid Vrabel static struct xenbus_driver netfront_driver = { 266995afae48SDavid Vrabel .ids = netfront_ids, 26700d160211SJeremy Fitzhardinge .probe = netfront_probe, 26718e0e46bbSBill Pemberton .remove = xennet_remove, 26720d160211SJeremy Fitzhardinge .resume = netfront_resume, 2673f502bf2bSIan Campbell .otherend_changed = netback_changed, 267495afae48SDavid Vrabel }; 26750d160211SJeremy Fitzhardinge 26760d160211SJeremy Fitzhardinge static int __init netif_init(void) 26770d160211SJeremy Fitzhardinge { 26786e833587SJeremy Fitzhardinge if (!xen_domain()) 26790d160211SJeremy Fitzhardinge return -ENODEV; 26800d160211SJeremy Fitzhardinge 268151c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_nic_devices()) 2682b9136d20SIgor Mammedov return -ENODEV; 2683b9136d20SIgor Mammedov 2684383eda32SJoe Perches pr_info("Initialising Xen virtual ethernet driver\n"); 26850d160211SJeremy Fitzhardinge 2686034702a6SJuergen Gross /* Allow as many queues as there are CPUs inut max. 8 if user has not 268732a84405SWei Liu * specified a value. 268832a84405SWei Liu */ 268932a84405SWei Liu if (xennet_max_queues == 0) 2690034702a6SJuergen Gross xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, 2691034702a6SJuergen Gross num_online_cpus()); 269250ee6061SAndrew J. Bennieston 2693ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 26940d160211SJeremy Fitzhardinge } 26950d160211SJeremy Fitzhardinge module_init(netif_init); 26960d160211SJeremy Fitzhardinge 26970d160211SJeremy Fitzhardinge 26980d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 26990d160211SJeremy Fitzhardinge { 2700ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 27010d160211SJeremy Fitzhardinge } 27020d160211SJeremy Fitzhardinge module_exit(netif_exit); 27030d160211SJeremy Fitzhardinge 27040d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 27050d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 2706d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 27074f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 2708