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 69c2c63310SAndrea Righi #define XENNET_TIMEOUT (5 * HZ) 70c2c63310SAndrea Righi 710fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 720d160211SJeremy Fitzhardinge 730d160211SJeremy Fitzhardinge struct netfront_cb { 743683243bSIan Campbell int pull_to; 750d160211SJeremy Fitzhardinge }; 760d160211SJeremy Fitzhardinge 770d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 780d160211SJeremy Fitzhardinge 790d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 800d160211SJeremy Fitzhardinge 810d160211SJeremy Fitzhardinge #define GRANT_INVALID_REF 0 820d160211SJeremy Fitzhardinge 8330c5d7f0SJulien Grall #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) 8430c5d7f0SJulien Grall #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) 851f3c2ebaSDavid Vrabel 861f3c2ebaSDavid Vrabel /* Minimum number of Rx slots (includes slot for GSO metadata). */ 871f3c2ebaSDavid Vrabel #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) 880d160211SJeremy Fitzhardinge 892688fcb7SAndrew J. Bennieston /* Queue name is interface name with "-qNNN" appended */ 902688fcb7SAndrew J. Bennieston #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) 912688fcb7SAndrew J. Bennieston 922688fcb7SAndrew J. Bennieston /* IRQ name is queue name with "-tx" or "-rx" appended */ 932688fcb7SAndrew J. Bennieston #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) 942688fcb7SAndrew J. Bennieston 958edfe2e9SJuergen Gross static DECLARE_WAIT_QUEUE_HEAD(module_wq); 965b5971dfSEduardo Otubo 97e00f85beSstephen hemminger struct netfront_stats { 98900e1833SDavid Vrabel u64 packets; 99900e1833SDavid Vrabel u64 bytes; 100e00f85beSstephen hemminger struct u64_stats_sync syncp; 101e00f85beSstephen hemminger }; 102e00f85beSstephen hemminger 1032688fcb7SAndrew J. Bennieston struct netfront_info; 1042688fcb7SAndrew J. Bennieston 1052688fcb7SAndrew J. Bennieston struct netfront_queue { 1062688fcb7SAndrew J. Bennieston unsigned int id; /* Queue ID, 0-based */ 1072688fcb7SAndrew J. Bennieston char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ 1082688fcb7SAndrew J. Bennieston struct netfront_info *info; 1090d160211SJeremy Fitzhardinge 1106c5aa6fcSDenis Kirjanov struct bpf_prog __rcu *xdp_prog; 1116c5aa6fcSDenis Kirjanov 112bea3348eSStephen Hemminger struct napi_struct napi; 1130d160211SJeremy Fitzhardinge 114d634bf2cSWei Liu /* Split event channels support, tx_* == rx_* when using 115d634bf2cSWei Liu * single event channel. 116d634bf2cSWei Liu */ 117d634bf2cSWei Liu unsigned int tx_evtchn, rx_evtchn; 118d634bf2cSWei Liu unsigned int tx_irq, rx_irq; 119d634bf2cSWei Liu /* Only used when split event channels support is enabled */ 1202688fcb7SAndrew J. Bennieston char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ 1212688fcb7SAndrew J. Bennieston char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ 1220d160211SJeremy Fitzhardinge 1230d160211SJeremy Fitzhardinge spinlock_t tx_lock; 12484284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 12584284d3cSJeremy Fitzhardinge int tx_ring_ref; 1260d160211SJeremy Fitzhardinge 1270d160211SJeremy Fitzhardinge /* 1280d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 1290d160211SJeremy Fitzhardinge * are linked from tx_skb_freelist through skb_entry.link. 1300d160211SJeremy Fitzhardinge * 1310d160211SJeremy Fitzhardinge * NB. Freelist index entries are always going to be less than 1320d160211SJeremy Fitzhardinge * PAGE_OFFSET, whereas pointers to skbs will always be equal or 1330d160211SJeremy Fitzhardinge * greater than PAGE_OFFSET: we use this property to distinguish 1340d160211SJeremy Fitzhardinge * them. 1350d160211SJeremy Fitzhardinge */ 1360d160211SJeremy Fitzhardinge union skb_entry { 1370d160211SJeremy Fitzhardinge struct sk_buff *skb; 1381ffb40b8SIsaku Yamahata unsigned long link; 1390d160211SJeremy Fitzhardinge } tx_skbs[NET_TX_RING_SIZE]; 1400d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1410d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 142cefe0078SAnnie Li struct page *grant_tx_page[NET_TX_RING_SIZE]; 1430d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 1440d160211SJeremy Fitzhardinge 14584284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 14684284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 14784284d3cSJeremy Fitzhardinge int rx_ring_ref; 14884284d3cSJeremy Fitzhardinge 14984284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 15084284d3cSJeremy Fitzhardinge 1510d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1520d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1530d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1546c5aa6fcSDenis Kirjanov 1556c5aa6fcSDenis Kirjanov struct page_pool *page_pool; 1566c5aa6fcSDenis Kirjanov struct xdp_rxq_info xdp_rxq; 1572688fcb7SAndrew J. Bennieston }; 1582688fcb7SAndrew J. Bennieston 1592688fcb7SAndrew J. Bennieston struct netfront_info { 1602688fcb7SAndrew J. Bennieston struct list_head list; 1612688fcb7SAndrew J. Bennieston struct net_device *netdev; 1622688fcb7SAndrew J. Bennieston 1632688fcb7SAndrew J. Bennieston struct xenbus_device *xbdev; 1642688fcb7SAndrew J. Bennieston 1652688fcb7SAndrew J. Bennieston /* Multi-queue support */ 1662688fcb7SAndrew J. Bennieston struct netfront_queue *queues; 167e0ce4af9SIan Campbell 168e0ce4af9SIan Campbell /* Statistics */ 169900e1833SDavid Vrabel struct netfront_stats __percpu *rx_stats; 170900e1833SDavid Vrabel struct netfront_stats __percpu *tx_stats; 171e00f85beSstephen hemminger 1726c5aa6fcSDenis Kirjanov /* XDP state */ 1736c5aa6fcSDenis Kirjanov bool netback_has_xdp_headroom; 1746c5aa6fcSDenis Kirjanov bool netfront_xdp_enabled; 1756c5aa6fcSDenis Kirjanov 1762688fcb7SAndrew J. Bennieston atomic_t rx_gso_checksum_fixup; 1770d160211SJeremy Fitzhardinge }; 1780d160211SJeremy Fitzhardinge 1790d160211SJeremy Fitzhardinge struct netfront_rx_info { 1800d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1810d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1820d160211SJeremy Fitzhardinge }; 1830d160211SJeremy Fitzhardinge 1841ffb40b8SIsaku Yamahata static void skb_entry_set_link(union skb_entry *list, unsigned short id) 1851ffb40b8SIsaku Yamahata { 1861ffb40b8SIsaku Yamahata list->link = id; 1871ffb40b8SIsaku Yamahata } 1881ffb40b8SIsaku Yamahata 1891ffb40b8SIsaku Yamahata static int skb_entry_is_link(const union skb_entry *list) 1901ffb40b8SIsaku Yamahata { 1911ffb40b8SIsaku Yamahata BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); 192807540baSEric Dumazet return (unsigned long)list->skb < PAGE_OFFSET; 1931ffb40b8SIsaku Yamahata } 1941ffb40b8SIsaku Yamahata 1950d160211SJeremy Fitzhardinge /* 1960d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1970d160211SJeremy Fitzhardinge */ 1980d160211SJeremy Fitzhardinge 1990d160211SJeremy Fitzhardinge static void add_id_to_freelist(unsigned *head, union skb_entry *list, 2000d160211SJeremy Fitzhardinge unsigned short id) 2010d160211SJeremy Fitzhardinge { 2021ffb40b8SIsaku Yamahata skb_entry_set_link(&list[id], *head); 2030d160211SJeremy Fitzhardinge *head = id; 2040d160211SJeremy Fitzhardinge } 2050d160211SJeremy Fitzhardinge 2060d160211SJeremy Fitzhardinge static unsigned short get_id_from_freelist(unsigned *head, 2070d160211SJeremy Fitzhardinge union skb_entry *list) 2080d160211SJeremy Fitzhardinge { 2090d160211SJeremy Fitzhardinge unsigned int id = *head; 2100d160211SJeremy Fitzhardinge *head = list[id].link; 2110d160211SJeremy Fitzhardinge return id; 2120d160211SJeremy Fitzhardinge } 2130d160211SJeremy Fitzhardinge 2140d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 2150d160211SJeremy Fitzhardinge { 2160d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 2170d160211SJeremy Fitzhardinge } 2180d160211SJeremy Fitzhardinge 2192688fcb7SAndrew J. Bennieston static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, 2200d160211SJeremy Fitzhardinge RING_IDX ri) 2210d160211SJeremy Fitzhardinge { 2220d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2232688fcb7SAndrew J. Bennieston struct sk_buff *skb = queue->rx_skbs[i]; 2242688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 2250d160211SJeremy Fitzhardinge return skb; 2260d160211SJeremy Fitzhardinge } 2270d160211SJeremy Fitzhardinge 2282688fcb7SAndrew J. Bennieston static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, 2290d160211SJeremy Fitzhardinge RING_IDX ri) 2300d160211SJeremy Fitzhardinge { 2310d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2322688fcb7SAndrew J. Bennieston grant_ref_t ref = queue->grant_rx_ref[i]; 2332688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 2340d160211SJeremy Fitzhardinge return ref; 2350d160211SJeremy Fitzhardinge } 2360d160211SJeremy Fitzhardinge 2370d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 23827b917e5STakashi Iwai static const struct attribute_group xennet_dev_group; 2390d160211SJeremy Fitzhardinge #endif 2400d160211SJeremy Fitzhardinge 2413ad9b358SMichał Mirosław static bool xennet_can_sg(struct net_device *dev) 2420d160211SJeremy Fitzhardinge { 2433ad9b358SMichał Mirosław return dev->features & NETIF_F_SG; 2440d160211SJeremy Fitzhardinge } 2450d160211SJeremy Fitzhardinge 2460d160211SJeremy Fitzhardinge 247e99e88a9SKees Cook static void rx_refill_timeout(struct timer_list *t) 2480d160211SJeremy Fitzhardinge { 249e99e88a9SKees Cook struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer); 2502688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 2510d160211SJeremy Fitzhardinge } 2520d160211SJeremy Fitzhardinge 2532688fcb7SAndrew J. Bennieston static int netfront_tx_slot_available(struct netfront_queue *queue) 2540d160211SJeremy Fitzhardinge { 2552688fcb7SAndrew J. Bennieston return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < 25657f230abSJuergen Gross (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); 2570d160211SJeremy Fitzhardinge } 2580d160211SJeremy Fitzhardinge 2592688fcb7SAndrew J. Bennieston static void xennet_maybe_wake_tx(struct netfront_queue *queue) 2600d160211SJeremy Fitzhardinge { 2612688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 2622688fcb7SAndrew J. Bennieston struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); 2630d160211SJeremy Fitzhardinge 2642688fcb7SAndrew J. Bennieston if (unlikely(netif_tx_queue_stopped(dev_queue)) && 2652688fcb7SAndrew J. Bennieston netfront_tx_slot_available(queue) && 2660d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2672688fcb7SAndrew J. Bennieston netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); 2680d160211SJeremy Fitzhardinge } 2690d160211SJeremy Fitzhardinge 2701f3c2ebaSDavid Vrabel 2711f3c2ebaSDavid Vrabel static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) 2720d160211SJeremy Fitzhardinge { 2730d160211SJeremy Fitzhardinge struct sk_buff *skb; 2740d160211SJeremy Fitzhardinge struct page *page; 2750d160211SJeremy Fitzhardinge 2762688fcb7SAndrew J. Bennieston skb = __netdev_alloc_skb(queue->info->netdev, 2772688fcb7SAndrew J. Bennieston RX_COPY_THRESHOLD + NET_IP_ALIGN, 2780d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2790d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2801f3c2ebaSDavid Vrabel return NULL; 281617a20bbSIsaku Yamahata 2826c5aa6fcSDenis Kirjanov page = page_pool_dev_alloc_pages(queue->page_pool); 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 366f599c64fSRoss Lagerwall if (!np->queues) 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 3882688fcb7SAndrew J. Bennieston static void 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; 3940d160211SJeremy Fitzhardinge 3952688fcb7SAndrew J. Bennieston BUG_ON(!netif_carrier_ok(queue->info->netdev)); 3960d160211SJeremy Fitzhardinge 3970d160211SJeremy Fitzhardinge do { 3982688fcb7SAndrew J. Bennieston prod = queue->tx.sring->rsp_prod; 3990d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 4000d160211SJeremy Fitzhardinge 4012688fcb7SAndrew J. Bennieston for (cons = queue->tx.rsp_cons; cons != prod; cons++) { 4020d160211SJeremy Fitzhardinge struct xen_netif_tx_response *txrsp; 4030d160211SJeremy Fitzhardinge 4042688fcb7SAndrew J. Bennieston txrsp = RING_GET_RESPONSE(&queue->tx, cons); 405f942dc25SIan Campbell if (txrsp->status == XEN_NETIF_RSP_NULL) 4060d160211SJeremy Fitzhardinge continue; 4070d160211SJeremy Fitzhardinge 4080d160211SJeremy Fitzhardinge id = txrsp->id; 4092688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[id].skb; 4100d160211SJeremy Fitzhardinge if (unlikely(gnttab_query_foreign_access( 4112688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id]) != 0)) { 412383eda32SJoe Perches pr_alert("%s: warning -- grant still in use by backend domain\n", 413383eda32SJoe Perches __func__); 4140d160211SJeremy Fitzhardinge BUG(); 4150d160211SJeremy Fitzhardinge } 4160d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref( 4172688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id], GNTMAP_readonly); 4180d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 4192688fcb7SAndrew J. Bennieston &queue->gref_tx_head, queue->grant_tx_ref[id]); 4202688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id] = GRANT_INVALID_REF; 4212688fcb7SAndrew J. Bennieston queue->grant_tx_page[id] = NULL; 4222688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id); 4230d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 4240d160211SJeremy Fitzhardinge } 4250d160211SJeremy Fitzhardinge 4262688fcb7SAndrew J. Bennieston queue->tx.rsp_cons = prod; 4270d160211SJeremy Fitzhardinge 4287d0105b5SMalcolm Crossley RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); 4297d0105b5SMalcolm Crossley } while (more_to_do); 4300d160211SJeremy Fitzhardinge 4312688fcb7SAndrew J. Bennieston xennet_maybe_wake_tx(queue); 4320d160211SJeremy Fitzhardinge } 4330d160211SJeremy Fitzhardinge 43430c5d7f0SJulien Grall struct xennet_gnttab_make_txreq { 43530c5d7f0SJulien Grall struct netfront_queue *queue; 43630c5d7f0SJulien Grall struct sk_buff *skb; 43730c5d7f0SJulien Grall struct page *page; 43830c5d7f0SJulien Grall struct xen_netif_tx_request *tx; /* Last request */ 43930c5d7f0SJulien Grall unsigned int size; 44030c5d7f0SJulien Grall }; 44130c5d7f0SJulien Grall 44230c5d7f0SJulien Grall static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, 44330c5d7f0SJulien Grall unsigned int len, void *data) 4440d160211SJeremy Fitzhardinge { 44530c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 4460d160211SJeremy Fitzhardinge unsigned int id; 447a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx; 4480d160211SJeremy Fitzhardinge grant_ref_t ref; 44930c5d7f0SJulien Grall /* convenient aliases */ 45030c5d7f0SJulien Grall struct page *page = info->page; 45130c5d7f0SJulien Grall struct netfront_queue *queue = info->queue; 45230c5d7f0SJulien Grall struct sk_buff *skb = info->skb; 4530d160211SJeremy Fitzhardinge 4542688fcb7SAndrew J. Bennieston id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); 455a55e8bb8SDavid Vrabel tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 4562688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_tx_head); 457269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 4580d160211SJeremy Fitzhardinge 45930c5d7f0SJulien Grall gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, 46030c5d7f0SJulien Grall gfn, GNTMAP_readonly); 4610d160211SJeremy Fitzhardinge 462a55e8bb8SDavid Vrabel queue->tx_skbs[id].skb = skb; 463a55e8bb8SDavid Vrabel queue->grant_tx_page[id] = page; 464a55e8bb8SDavid Vrabel queue->grant_tx_ref[id] = ref; 465a55e8bb8SDavid Vrabel 466a55e8bb8SDavid Vrabel tx->id = id; 467a55e8bb8SDavid Vrabel tx->gref = ref; 4680d160211SJeremy Fitzhardinge tx->offset = offset; 4690d160211SJeremy Fitzhardinge tx->size = len; 4700d160211SJeremy Fitzhardinge tx->flags = 0; 471a55e8bb8SDavid Vrabel 47230c5d7f0SJulien Grall info->tx = tx; 47330c5d7f0SJulien Grall info->size += tx->size; 47430c5d7f0SJulien Grall } 47530c5d7f0SJulien Grall 47630c5d7f0SJulien Grall static struct xen_netif_tx_request *xennet_make_first_txreq( 47730c5d7f0SJulien Grall struct netfront_queue *queue, struct sk_buff *skb, 47830c5d7f0SJulien Grall struct page *page, unsigned int offset, unsigned int len) 47930c5d7f0SJulien Grall { 48030c5d7f0SJulien Grall struct xennet_gnttab_make_txreq info = { 48130c5d7f0SJulien Grall .queue = queue, 48230c5d7f0SJulien Grall .skb = skb, 48330c5d7f0SJulien Grall .page = page, 48430c5d7f0SJulien Grall .size = 0, 48530c5d7f0SJulien Grall }; 48630c5d7f0SJulien Grall 48730c5d7f0SJulien Grall gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info); 48830c5d7f0SJulien Grall 48930c5d7f0SJulien Grall return info.tx; 49030c5d7f0SJulien Grall } 49130c5d7f0SJulien Grall 49230c5d7f0SJulien Grall static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, 49330c5d7f0SJulien Grall unsigned int len, void *data) 49430c5d7f0SJulien Grall { 49530c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 49630c5d7f0SJulien Grall 49730c5d7f0SJulien Grall info->tx->flags |= XEN_NETTXF_more_data; 49830c5d7f0SJulien Grall skb_get(info->skb); 49930c5d7f0SJulien Grall xennet_tx_setup_grant(gfn, offset, len, data); 5000d160211SJeremy Fitzhardinge } 5010d160211SJeremy Fitzhardinge 502a55e8bb8SDavid Vrabel static struct xen_netif_tx_request *xennet_make_txreqs( 503a55e8bb8SDavid Vrabel struct netfront_queue *queue, struct xen_netif_tx_request *tx, 504a55e8bb8SDavid Vrabel struct sk_buff *skb, struct page *page, 505a55e8bb8SDavid Vrabel unsigned int offset, unsigned int len) 506a55e8bb8SDavid Vrabel { 50730c5d7f0SJulien Grall struct xennet_gnttab_make_txreq info = { 50830c5d7f0SJulien Grall .queue = queue, 50930c5d7f0SJulien Grall .skb = skb, 51030c5d7f0SJulien Grall .tx = tx, 51130c5d7f0SJulien Grall }; 51230c5d7f0SJulien Grall 513f36c3747SIan Campbell /* Skip unused frames from start of page */ 514f36c3747SIan Campbell page += offset >> PAGE_SHIFT; 515f36c3747SIan Campbell offset &= ~PAGE_MASK; 516f36c3747SIan Campbell 517a55e8bb8SDavid Vrabel while (len) { 51830c5d7f0SJulien Grall info.page = page; 51930c5d7f0SJulien Grall info.size = 0; 52030c5d7f0SJulien Grall 52130c5d7f0SJulien Grall gnttab_foreach_grant_in_range(page, offset, len, 52230c5d7f0SJulien Grall xennet_make_one_txreq, 52330c5d7f0SJulien Grall &info); 52430c5d7f0SJulien Grall 525f36c3747SIan Campbell page++; 526f36c3747SIan Campbell offset = 0; 52730c5d7f0SJulien Grall len -= info.size; 5280d160211SJeremy Fitzhardinge } 5290d160211SJeremy Fitzhardinge 53030c5d7f0SJulien Grall return info.tx; 5310d160211SJeremy Fitzhardinge } 5320d160211SJeremy Fitzhardinge 533f36c3747SIan Campbell /* 534e84448d5SDavid Vrabel * Count how many ring slots are required to send this skb. Each frag 535e84448d5SDavid Vrabel * might be a compound page. 536f36c3747SIan Campbell */ 537e84448d5SDavid Vrabel static int xennet_count_skb_slots(struct sk_buff *skb) 538f36c3747SIan Campbell { 539f36c3747SIan Campbell int i, frags = skb_shinfo(skb)->nr_frags; 54030c5d7f0SJulien Grall int slots; 541e84448d5SDavid Vrabel 54230c5d7f0SJulien Grall slots = gnttab_count_grant(offset_in_page(skb->data), 54330c5d7f0SJulien Grall skb_headlen(skb)); 544f36c3747SIan Campbell 545f36c3747SIan Campbell for (i = 0; i < frags; i++) { 546f36c3747SIan Campbell skb_frag_t *frag = skb_shinfo(skb)->frags + i; 547f36c3747SIan Campbell unsigned long size = skb_frag_size(frag); 548b54c9d5bSJonathan Lemon unsigned long offset = skb_frag_off(frag); 549f36c3747SIan Campbell 550f36c3747SIan Campbell /* Skip unused frames from start of page */ 551f36c3747SIan Campbell offset &= ~PAGE_MASK; 552f36c3747SIan Campbell 55330c5d7f0SJulien Grall slots += gnttab_count_grant(offset, size); 554f36c3747SIan Campbell } 555f36c3747SIan Campbell 55630c5d7f0SJulien Grall return slots; 557f36c3747SIan Campbell } 558f36c3747SIan Campbell 55950ee6061SAndrew J. Bennieston static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, 560a350ecceSPaolo Abeni struct net_device *sb_dev) 5612688fcb7SAndrew J. Bennieston { 56250ee6061SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 56350ee6061SAndrew J. Bennieston u32 hash; 56450ee6061SAndrew J. Bennieston u16 queue_idx; 56550ee6061SAndrew J. Bennieston 56650ee6061SAndrew J. Bennieston /* First, check if there is only one queue */ 56750ee6061SAndrew J. Bennieston if (num_queues == 1) { 56850ee6061SAndrew J. Bennieston queue_idx = 0; 56950ee6061SAndrew J. Bennieston } else { 57050ee6061SAndrew J. Bennieston hash = skb_get_hash(skb); 57150ee6061SAndrew J. Bennieston queue_idx = hash % num_queues; 57250ee6061SAndrew J. Bennieston } 57350ee6061SAndrew J. Bennieston 57450ee6061SAndrew J. Bennieston return queue_idx; 5752688fcb7SAndrew J. Bennieston } 5762688fcb7SAndrew J. Bennieston 5776c5aa6fcSDenis Kirjanov static int xennet_xdp_xmit_one(struct net_device *dev, 5786c5aa6fcSDenis Kirjanov struct netfront_queue *queue, 5796c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf) 5806c5aa6fcSDenis Kirjanov { 5816c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 5826c5aa6fcSDenis Kirjanov struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 5836c5aa6fcSDenis Kirjanov int notify; 5846c5aa6fcSDenis Kirjanov 5856c5aa6fcSDenis Kirjanov xennet_make_first_txreq(queue, NULL, 5866c5aa6fcSDenis Kirjanov virt_to_page(xdpf->data), 5876c5aa6fcSDenis Kirjanov offset_in_page(xdpf->data), 5886c5aa6fcSDenis Kirjanov xdpf->len); 5896c5aa6fcSDenis Kirjanov 5906c5aa6fcSDenis Kirjanov RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 5916c5aa6fcSDenis Kirjanov if (notify) 5926c5aa6fcSDenis Kirjanov notify_remote_via_irq(queue->tx_irq); 5936c5aa6fcSDenis Kirjanov 5946c5aa6fcSDenis Kirjanov u64_stats_update_begin(&tx_stats->syncp); 5956c5aa6fcSDenis Kirjanov tx_stats->bytes += xdpf->len; 5966c5aa6fcSDenis Kirjanov tx_stats->packets++; 5976c5aa6fcSDenis Kirjanov u64_stats_update_end(&tx_stats->syncp); 5986c5aa6fcSDenis Kirjanov 5996c5aa6fcSDenis Kirjanov xennet_tx_buf_gc(queue); 6006c5aa6fcSDenis Kirjanov 6016c5aa6fcSDenis Kirjanov return 0; 6026c5aa6fcSDenis Kirjanov } 6036c5aa6fcSDenis Kirjanov 6046c5aa6fcSDenis Kirjanov static int xennet_xdp_xmit(struct net_device *dev, int n, 6056c5aa6fcSDenis Kirjanov struct xdp_frame **frames, u32 flags) 6066c5aa6fcSDenis Kirjanov { 6076c5aa6fcSDenis Kirjanov unsigned int num_queues = dev->real_num_tx_queues; 6086c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 6096c5aa6fcSDenis Kirjanov struct netfront_queue *queue = NULL; 6106c5aa6fcSDenis Kirjanov unsigned long irq_flags; 6116c5aa6fcSDenis Kirjanov int drops = 0; 6126c5aa6fcSDenis Kirjanov int i, err; 6136c5aa6fcSDenis Kirjanov 6146c5aa6fcSDenis Kirjanov if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 6156c5aa6fcSDenis Kirjanov return -EINVAL; 6166c5aa6fcSDenis Kirjanov 6176c5aa6fcSDenis Kirjanov queue = &np->queues[smp_processor_id() % num_queues]; 6186c5aa6fcSDenis Kirjanov 6196c5aa6fcSDenis Kirjanov spin_lock_irqsave(&queue->tx_lock, irq_flags); 6206c5aa6fcSDenis Kirjanov for (i = 0; i < n; i++) { 6216c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf = frames[i]; 6226c5aa6fcSDenis Kirjanov 6236c5aa6fcSDenis Kirjanov if (!xdpf) 6246c5aa6fcSDenis Kirjanov continue; 6256c5aa6fcSDenis Kirjanov err = xennet_xdp_xmit_one(dev, queue, xdpf); 6266c5aa6fcSDenis Kirjanov if (err) { 6276c5aa6fcSDenis Kirjanov xdp_return_frame_rx_napi(xdpf); 6286c5aa6fcSDenis Kirjanov drops++; 6296c5aa6fcSDenis Kirjanov } 6306c5aa6fcSDenis Kirjanov } 6316c5aa6fcSDenis Kirjanov spin_unlock_irqrestore(&queue->tx_lock, irq_flags); 6326c5aa6fcSDenis Kirjanov 6336c5aa6fcSDenis Kirjanov return n - drops; 6346c5aa6fcSDenis Kirjanov } 6356c5aa6fcSDenis Kirjanov 6366c5aa6fcSDenis Kirjanov 63730c5d7f0SJulien Grall #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) 63830c5d7f0SJulien Grall 63924a94b3cSLuc Van Oostenryck static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 6400d160211SJeremy Fitzhardinge { 6410d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 642900e1833SDavid Vrabel struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 643a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx, *first_tx; 644a55e8bb8SDavid Vrabel unsigned int i; 6450d160211SJeremy Fitzhardinge int notify; 646f36c3747SIan Campbell int slots; 647a55e8bb8SDavid Vrabel struct page *page; 648a55e8bb8SDavid Vrabel unsigned int offset; 649a55e8bb8SDavid Vrabel unsigned int len; 650cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 6512688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 6522688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 6532688fcb7SAndrew J. Bennieston u16 queue_index; 654fd07160bSVitaly Kuznetsov struct sk_buff *nskb; 6552688fcb7SAndrew J. Bennieston 6562688fcb7SAndrew J. Bennieston /* Drop the packet if no queues are set up */ 6572688fcb7SAndrew J. Bennieston if (num_queues < 1) 6582688fcb7SAndrew J. Bennieston goto drop; 6592688fcb7SAndrew J. Bennieston /* Determine which queue to transmit this SKB on */ 6602688fcb7SAndrew J. Bennieston queue_index = skb_get_queue_mapping(skb); 6612688fcb7SAndrew J. Bennieston queue = &np->queues[queue_index]; 6620d160211SJeremy Fitzhardinge 6639ecd1a75SWei Liu /* If skb->len is too big for wire format, drop skb and alert 6649ecd1a75SWei Liu * user about misconfiguration. 6659ecd1a75SWei Liu */ 6669ecd1a75SWei Liu if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { 6679ecd1a75SWei Liu net_alert_ratelimited( 6689ecd1a75SWei Liu "xennet: skb->len = %u, too big for wire format\n", 6699ecd1a75SWei Liu skb->len); 6709ecd1a75SWei Liu goto drop; 6719ecd1a75SWei Liu } 6729ecd1a75SWei Liu 673e84448d5SDavid Vrabel slots = xennet_count_skb_slots(skb); 67430c5d7f0SJulien Grall if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { 67597a6d1bbSZoltan Kiss net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", 67697a6d1bbSZoltan Kiss slots, skb->len); 67797a6d1bbSZoltan Kiss if (skb_linearize(skb)) 6780d160211SJeremy Fitzhardinge goto drop; 6790d160211SJeremy Fitzhardinge } 6800d160211SJeremy Fitzhardinge 681a55e8bb8SDavid Vrabel page = virt_to_page(skb->data); 682a55e8bb8SDavid Vrabel offset = offset_in_page(skb->data); 683fd07160bSVitaly Kuznetsov 684fd07160bSVitaly Kuznetsov /* The first req should be at least ETH_HLEN size or the packet will be 685fd07160bSVitaly Kuznetsov * dropped by netback. 686fd07160bSVitaly Kuznetsov */ 687fd07160bSVitaly Kuznetsov if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { 688fd07160bSVitaly Kuznetsov nskb = skb_copy(skb, GFP_ATOMIC); 689fd07160bSVitaly Kuznetsov if (!nskb) 690fd07160bSVitaly Kuznetsov goto drop; 69162f3250fSEric Dumazet dev_consume_skb_any(skb); 692fd07160bSVitaly Kuznetsov skb = nskb; 693fd07160bSVitaly Kuznetsov page = virt_to_page(skb->data); 694fd07160bSVitaly Kuznetsov offset = offset_in_page(skb->data); 695fd07160bSVitaly Kuznetsov } 696fd07160bSVitaly Kuznetsov 697a55e8bb8SDavid Vrabel len = skb_headlen(skb); 698a55e8bb8SDavid Vrabel 6992688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 7000d160211SJeremy Fitzhardinge 7010d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 702f36c3747SIan Campbell (slots > 1 && !xennet_can_sg(dev)) || 7038b86a61dSJohannes Berg netif_needs_gso(skb, netif_skb_features(skb)))) { 7042688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 7050d160211SJeremy Fitzhardinge goto drop; 7060d160211SJeremy Fitzhardinge } 7070d160211SJeremy Fitzhardinge 708a55e8bb8SDavid Vrabel /* First request for the linear area. */ 70930c5d7f0SJulien Grall first_tx = tx = xennet_make_first_txreq(queue, skb, 710a55e8bb8SDavid Vrabel page, offset, len); 71130c5d7f0SJulien Grall offset += tx->size; 71230c5d7f0SJulien Grall if (offset == PAGE_SIZE) { 713a55e8bb8SDavid Vrabel page++; 714a55e8bb8SDavid Vrabel offset = 0; 71530c5d7f0SJulien Grall } 716a55e8bb8SDavid Vrabel len -= tx->size; 7170d160211SJeremy Fitzhardinge 7180d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 7190d160211SJeremy Fitzhardinge /* local packet? */ 720f942dc25SIan Campbell tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; 7210d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 7220d160211SJeremy Fitzhardinge /* remote but checksummed. */ 723f942dc25SIan Campbell tx->flags |= XEN_NETTXF_data_validated; 7240d160211SJeremy Fitzhardinge 725a55e8bb8SDavid Vrabel /* Optional extra info after the first request. */ 7260d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 7270d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 7280d160211SJeremy Fitzhardinge 7290d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 730a55e8bb8SDavid Vrabel RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 7310d160211SJeremy Fitzhardinge 732f942dc25SIan Campbell tx->flags |= XEN_NETTXF_extra_info; 7330d160211SJeremy Fitzhardinge 7340d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 7352c0057deSPaul Durrant gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? 7362c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV6 : 7372c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV4; 7380d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 7390d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 7400d160211SJeremy Fitzhardinge 7410d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 7420d160211SJeremy Fitzhardinge gso->flags = 0; 7430d160211SJeremy Fitzhardinge } 7440d160211SJeremy Fitzhardinge 745a55e8bb8SDavid Vrabel /* Requests for the rest of the linear area. */ 746a55e8bb8SDavid Vrabel tx = xennet_make_txreqs(queue, tx, skb, page, offset, len); 7470d160211SJeremy Fitzhardinge 748a55e8bb8SDavid Vrabel /* Requests for all the frags. */ 749a55e8bb8SDavid Vrabel for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 750a55e8bb8SDavid Vrabel skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 751b54c9d5bSJonathan Lemon tx = xennet_make_txreqs(queue, tx, skb, skb_frag_page(frag), 752b54c9d5bSJonathan Lemon skb_frag_off(frag), 753a55e8bb8SDavid Vrabel skb_frag_size(frag)); 754a55e8bb8SDavid Vrabel } 755a55e8bb8SDavid Vrabel 756a55e8bb8SDavid Vrabel /* First request has the packet length. */ 757a55e8bb8SDavid Vrabel first_tx->size = skb->len; 7580d160211SJeremy Fitzhardinge 75991ffb9d3SDaniel Drown /* timestamp packet in software */ 76091ffb9d3SDaniel Drown skb_tx_timestamp(skb); 76191ffb9d3SDaniel Drown 7622688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 7630d160211SJeremy Fitzhardinge if (notify) 7642688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 7650d160211SJeremy Fitzhardinge 766900e1833SDavid Vrabel u64_stats_update_begin(&tx_stats->syncp); 767900e1833SDavid Vrabel tx_stats->bytes += skb->len; 768900e1833SDavid Vrabel tx_stats->packets++; 769900e1833SDavid Vrabel u64_stats_update_end(&tx_stats->syncp); 77010a273a6SJeremy Fitzhardinge 77110a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 7722688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 7730d160211SJeremy Fitzhardinge 7742688fcb7SAndrew J. Bennieston if (!netfront_tx_slot_available(queue)) 7752688fcb7SAndrew J. Bennieston netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); 7760d160211SJeremy Fitzhardinge 7772688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 7780d160211SJeremy Fitzhardinge 7796ed10654SPatrick McHardy return NETDEV_TX_OK; 7800d160211SJeremy Fitzhardinge 7810d160211SJeremy Fitzhardinge drop: 78209f75cd7SJeff Garzik dev->stats.tx_dropped++; 783979de8a0SEric W. Biederman dev_kfree_skb_any(skb); 7846ed10654SPatrick McHardy return NETDEV_TX_OK; 7850d160211SJeremy Fitzhardinge } 7860d160211SJeremy Fitzhardinge 7870d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 7880d160211SJeremy Fitzhardinge { 7890d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 7902688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 7912688fcb7SAndrew J. Bennieston unsigned int i; 7922688fcb7SAndrew J. Bennieston struct netfront_queue *queue; 7932688fcb7SAndrew J. Bennieston netif_tx_stop_all_queues(np->netdev); 7942688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 7952688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 7962688fcb7SAndrew J. Bennieston napi_disable(&queue->napi); 7972688fcb7SAndrew J. Bennieston } 7980d160211SJeremy Fitzhardinge return 0; 7990d160211SJeremy Fitzhardinge } 8000d160211SJeremy Fitzhardinge 8012688fcb7SAndrew J. Bennieston static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, 8020d160211SJeremy Fitzhardinge grant_ref_t ref) 8030d160211SJeremy Fitzhardinge { 8042688fcb7SAndrew J. Bennieston int new = xennet_rxidx(queue->rx.req_prod_pvt); 8050d160211SJeremy Fitzhardinge 8062688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[new]); 8072688fcb7SAndrew J. Bennieston queue->rx_skbs[new] = skb; 8082688fcb7SAndrew J. Bennieston queue->grant_rx_ref[new] = ref; 8092688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; 8102688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; 8112688fcb7SAndrew J. Bennieston queue->rx.req_prod_pvt++; 8120d160211SJeremy Fitzhardinge } 8130d160211SJeremy Fitzhardinge 8142688fcb7SAndrew J. Bennieston static int xennet_get_extras(struct netfront_queue *queue, 8150d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 8160d160211SJeremy Fitzhardinge RING_IDX rp) 8170d160211SJeremy Fitzhardinge 8180d160211SJeremy Fitzhardinge { 8190d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 8202688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 8212688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 8220d160211SJeremy Fitzhardinge int err = 0; 8230d160211SJeremy Fitzhardinge 8240d160211SJeremy Fitzhardinge do { 8250d160211SJeremy Fitzhardinge struct sk_buff *skb; 8260d160211SJeremy Fitzhardinge grant_ref_t ref; 8270d160211SJeremy Fitzhardinge 8280d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 8290d160211SJeremy Fitzhardinge if (net_ratelimit()) 8300d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 8310d160211SJeremy Fitzhardinge err = -EBADR; 8320d160211SJeremy Fitzhardinge break; 8330d160211SJeremy Fitzhardinge } 8340d160211SJeremy Fitzhardinge 8350d160211SJeremy Fitzhardinge extra = (struct xen_netif_extra_info *) 8362688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 8370d160211SJeremy Fitzhardinge 8380d160211SJeremy Fitzhardinge if (unlikely(!extra->type || 8390d160211SJeremy Fitzhardinge extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 8400d160211SJeremy Fitzhardinge if (net_ratelimit()) 8410d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 8420d160211SJeremy Fitzhardinge extra->type); 8430d160211SJeremy Fitzhardinge err = -EINVAL; 8440d160211SJeremy Fitzhardinge } else { 8450d160211SJeremy Fitzhardinge memcpy(&extras[extra->type - 1], extra, 8460d160211SJeremy Fitzhardinge sizeof(*extra)); 8470d160211SJeremy Fitzhardinge } 8480d160211SJeremy Fitzhardinge 8492688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons); 8502688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons); 8512688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 8520d160211SJeremy Fitzhardinge } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 8530d160211SJeremy Fitzhardinge 8542688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons; 8550d160211SJeremy Fitzhardinge return err; 8560d160211SJeremy Fitzhardinge } 8570d160211SJeremy Fitzhardinge 8586c5aa6fcSDenis Kirjanov static u32 xennet_run_xdp(struct netfront_queue *queue, struct page *pdata, 8596c5aa6fcSDenis Kirjanov struct xen_netif_rx_response *rx, struct bpf_prog *prog, 8606c5aa6fcSDenis Kirjanov struct xdp_buff *xdp, bool *need_xdp_flush) 8616c5aa6fcSDenis Kirjanov { 8626c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf; 8636c5aa6fcSDenis Kirjanov u32 len = rx->status; 864e44f65fdSColin Ian King u32 act; 8656c5aa6fcSDenis Kirjanov int err; 8666c5aa6fcSDenis Kirjanov 867*43b5169dSLorenzo Bianconi xdp_init_buff(xdp, XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, 868*43b5169dSLorenzo Bianconi &queue->xdp_rxq); 8696c5aa6fcSDenis Kirjanov xdp->data_hard_start = page_address(pdata); 8706c5aa6fcSDenis Kirjanov xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM; 8716c5aa6fcSDenis Kirjanov xdp_set_data_meta_invalid(xdp); 8726c5aa6fcSDenis Kirjanov xdp->data_end = xdp->data + len; 8736c5aa6fcSDenis Kirjanov 8746c5aa6fcSDenis Kirjanov act = bpf_prog_run_xdp(prog, xdp); 8756c5aa6fcSDenis Kirjanov switch (act) { 8766c5aa6fcSDenis Kirjanov case XDP_TX: 8776c5aa6fcSDenis Kirjanov get_page(pdata); 8786c5aa6fcSDenis Kirjanov xdpf = xdp_convert_buff_to_frame(xdp); 8796c5aa6fcSDenis Kirjanov err = xennet_xdp_xmit(queue->info->netdev, 1, &xdpf, 0); 8806c5aa6fcSDenis Kirjanov if (unlikely(err < 0)) 8816c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 8826c5aa6fcSDenis Kirjanov break; 8836c5aa6fcSDenis Kirjanov case XDP_REDIRECT: 8846c5aa6fcSDenis Kirjanov get_page(pdata); 8856c5aa6fcSDenis Kirjanov err = xdp_do_redirect(queue->info->netdev, xdp, prog); 8866c5aa6fcSDenis Kirjanov *need_xdp_flush = true; 8876c5aa6fcSDenis Kirjanov if (unlikely(err)) 8886c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 8896c5aa6fcSDenis Kirjanov break; 8906c5aa6fcSDenis Kirjanov case XDP_PASS: 8916c5aa6fcSDenis Kirjanov case XDP_DROP: 8926c5aa6fcSDenis Kirjanov break; 8936c5aa6fcSDenis Kirjanov 8946c5aa6fcSDenis Kirjanov case XDP_ABORTED: 8956c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 8966c5aa6fcSDenis Kirjanov break; 8976c5aa6fcSDenis Kirjanov 8986c5aa6fcSDenis Kirjanov default: 8996c5aa6fcSDenis Kirjanov bpf_warn_invalid_xdp_action(act); 9006c5aa6fcSDenis Kirjanov } 9016c5aa6fcSDenis Kirjanov 9026c5aa6fcSDenis Kirjanov return act; 9036c5aa6fcSDenis Kirjanov } 9046c5aa6fcSDenis Kirjanov 9052688fcb7SAndrew J. Bennieston static int xennet_get_responses(struct netfront_queue *queue, 9060d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 9076c5aa6fcSDenis Kirjanov struct sk_buff_head *list, 9086c5aa6fcSDenis Kirjanov bool *need_xdp_flush) 9090d160211SJeremy Fitzhardinge { 9100d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo->rx; 9116c5aa6fcSDenis Kirjanov int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); 9122688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 9132688fcb7SAndrew J. Bennieston struct sk_buff *skb = xennet_get_rx_skb(queue, cons); 9146c5aa6fcSDenis Kirjanov struct xen_netif_extra_info *extras = rinfo->extras; 9152688fcb7SAndrew J. Bennieston grant_ref_t ref = xennet_get_rx_ref(queue, cons); 9166c5aa6fcSDenis Kirjanov struct device *dev = &queue->info->netdev->dev; 9176c5aa6fcSDenis Kirjanov struct bpf_prog *xdp_prog; 9186c5aa6fcSDenis Kirjanov struct xdp_buff xdp; 9196c5aa6fcSDenis Kirjanov unsigned long ret; 9207158ff6dSWei Liu int slots = 1; 9210d160211SJeremy Fitzhardinge int err = 0; 9226c5aa6fcSDenis Kirjanov u32 verdict; 9230d160211SJeremy Fitzhardinge 924f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_extra_info) { 9252688fcb7SAndrew J. Bennieston err = xennet_get_extras(queue, extras, rp); 9266c5aa6fcSDenis Kirjanov if (!err) { 9276c5aa6fcSDenis Kirjanov if (extras[XEN_NETIF_EXTRA_TYPE_XDP - 1].type) { 9286c5aa6fcSDenis Kirjanov struct xen_netif_extra_info *xdp; 9296c5aa6fcSDenis Kirjanov 9306c5aa6fcSDenis Kirjanov xdp = &extras[XEN_NETIF_EXTRA_TYPE_XDP - 1]; 9316c5aa6fcSDenis Kirjanov rx->offset = xdp->u.xdp.headroom; 9326c5aa6fcSDenis Kirjanov } 9336c5aa6fcSDenis Kirjanov } 9342688fcb7SAndrew J. Bennieston cons = queue->rx.rsp_cons; 9350d160211SJeremy Fitzhardinge } 9360d160211SJeremy Fitzhardinge 9370d160211SJeremy Fitzhardinge for (;;) { 9380d160211SJeremy Fitzhardinge if (unlikely(rx->status < 0 || 93930c5d7f0SJulien Grall rx->offset + rx->status > XEN_PAGE_SIZE)) { 9400d160211SJeremy Fitzhardinge if (net_ratelimit()) 9416c10127dSJulien Grall dev_warn(dev, "rx->offset: %u, size: %d\n", 9420d160211SJeremy Fitzhardinge rx->offset, rx->status); 9432688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 9440d160211SJeremy Fitzhardinge err = -EINVAL; 9450d160211SJeremy Fitzhardinge goto next; 9460d160211SJeremy Fitzhardinge } 9470d160211SJeremy Fitzhardinge 9480d160211SJeremy Fitzhardinge /* 9490d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 9500d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 951697089dcSWei Liu * situation to the system controller to reboot the backend. 9520d160211SJeremy Fitzhardinge */ 9530d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 9540d160211SJeremy Fitzhardinge if (net_ratelimit()) 9550d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 9560d160211SJeremy Fitzhardinge rx->id); 9570d160211SJeremy Fitzhardinge err = -EINVAL; 9580d160211SJeremy Fitzhardinge goto next; 9590d160211SJeremy Fitzhardinge } 9600d160211SJeremy Fitzhardinge 9610d160211SJeremy Fitzhardinge ret = gnttab_end_foreign_access_ref(ref, 0); 9620d160211SJeremy Fitzhardinge BUG_ON(!ret); 9630d160211SJeremy Fitzhardinge 9642688fcb7SAndrew J. Bennieston gnttab_release_grant_reference(&queue->gref_rx_head, ref); 9650d160211SJeremy Fitzhardinge 9666c5aa6fcSDenis Kirjanov rcu_read_lock(); 9676c5aa6fcSDenis Kirjanov xdp_prog = rcu_dereference(queue->xdp_prog); 9686c5aa6fcSDenis Kirjanov if (xdp_prog) { 9696c5aa6fcSDenis Kirjanov if (!(rx->flags & XEN_NETRXF_more_data)) { 9706c5aa6fcSDenis Kirjanov /* currently only a single page contains data */ 9716c5aa6fcSDenis Kirjanov verdict = xennet_run_xdp(queue, 9726c5aa6fcSDenis Kirjanov skb_frag_page(&skb_shinfo(skb)->frags[0]), 9736c5aa6fcSDenis Kirjanov rx, xdp_prog, &xdp, need_xdp_flush); 9746c5aa6fcSDenis Kirjanov if (verdict != XDP_PASS) 9756c5aa6fcSDenis Kirjanov err = -EINVAL; 9766c5aa6fcSDenis Kirjanov } else { 9776c5aa6fcSDenis Kirjanov /* drop the frame */ 9786c5aa6fcSDenis Kirjanov err = -EINVAL; 9796c5aa6fcSDenis Kirjanov } 9806c5aa6fcSDenis Kirjanov } 9816c5aa6fcSDenis Kirjanov rcu_read_unlock(); 9820d160211SJeremy Fitzhardinge next: 9836c5aa6fcSDenis Kirjanov __skb_queue_tail(list, skb); 984f942dc25SIan Campbell if (!(rx->flags & XEN_NETRXF_more_data)) 9850d160211SJeremy Fitzhardinge break; 9860d160211SJeremy Fitzhardinge 9877158ff6dSWei Liu if (cons + slots == rp) { 9880d160211SJeremy Fitzhardinge if (net_ratelimit()) 9897158ff6dSWei Liu dev_warn(dev, "Need more slots\n"); 9900d160211SJeremy Fitzhardinge err = -ENOENT; 9910d160211SJeremy Fitzhardinge break; 9920d160211SJeremy Fitzhardinge } 9930d160211SJeremy Fitzhardinge 9942688fcb7SAndrew J. Bennieston rx = RING_GET_RESPONSE(&queue->rx, cons + slots); 9952688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons + slots); 9962688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons + slots); 9977158ff6dSWei Liu slots++; 9980d160211SJeremy Fitzhardinge } 9990d160211SJeremy Fitzhardinge 10007158ff6dSWei Liu if (unlikely(slots > max)) { 10010d160211SJeremy Fitzhardinge if (net_ratelimit()) 1002697089dcSWei Liu dev_warn(dev, "Too many slots\n"); 10030d160211SJeremy Fitzhardinge err = -E2BIG; 10040d160211SJeremy Fitzhardinge } 10050d160211SJeremy Fitzhardinge 10060d160211SJeremy Fitzhardinge if (unlikely(err)) 10072688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons + slots; 10080d160211SJeremy Fitzhardinge 10090d160211SJeremy Fitzhardinge return err; 10100d160211SJeremy Fitzhardinge } 10110d160211SJeremy Fitzhardinge 10120d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 10130d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 10140d160211SJeremy Fitzhardinge { 10150d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 10160d160211SJeremy Fitzhardinge if (net_ratelimit()) 1017383eda32SJoe Perches pr_warn("GSO size must not be zero\n"); 10180d160211SJeremy Fitzhardinge return -EINVAL; 10190d160211SJeremy Fitzhardinge } 10200d160211SJeremy Fitzhardinge 10212c0057deSPaul Durrant if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && 10222c0057deSPaul Durrant gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { 10230d160211SJeremy Fitzhardinge if (net_ratelimit()) 1024383eda32SJoe Perches pr_warn("Bad GSO type %d\n", gso->u.gso.type); 10250d160211SJeremy Fitzhardinge return -EINVAL; 10260d160211SJeremy Fitzhardinge } 10270d160211SJeremy Fitzhardinge 10280d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 10292c0057deSPaul Durrant skb_shinfo(skb)->gso_type = 10302c0057deSPaul Durrant (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? 10312c0057deSPaul Durrant SKB_GSO_TCPV4 : 10322c0057deSPaul Durrant SKB_GSO_TCPV6; 10330d160211SJeremy Fitzhardinge 10340d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 10350d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 10360d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 10370d160211SJeremy Fitzhardinge 10380d160211SJeremy Fitzhardinge return 0; 10390d160211SJeremy Fitzhardinge } 10400d160211SJeremy Fitzhardinge 1041a761129eSDongli Zhang static int xennet_fill_frags(struct netfront_queue *queue, 10420d160211SJeremy Fitzhardinge struct sk_buff *skb, 10430d160211SJeremy Fitzhardinge struct sk_buff_head *list) 10440d160211SJeremy Fitzhardinge { 10452688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 10460d160211SJeremy Fitzhardinge struct sk_buff *nskb; 10470d160211SJeremy Fitzhardinge 10480d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 10490d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = 10502688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 105101c68026SIan Campbell skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; 10520d160211SJeremy Fitzhardinge 1053d472b3a6SJuergen Gross if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { 1054093b9c71SJan Beulich unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 10550d160211SJeremy Fitzhardinge 1056d81c5054SJuergen Gross BUG_ON(pull_to < skb_headlen(skb)); 1057093b9c71SJan Beulich __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 1058093b9c71SJan Beulich } 1059ad4f15dcSJuergen Gross if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { 106000b36850SDongli Zhang queue->rx.rsp_cons = ++cons + skb_queue_len(list); 1061ad4f15dcSJuergen Gross kfree_skb(nskb); 1062a761129eSDongli Zhang return -ENOENT; 1063ad4f15dcSJuergen Gross } 1064093b9c71SJan Beulich 1065d472b3a6SJuergen Gross skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 1066d472b3a6SJuergen Gross skb_frag_page(nfrag), 1067093b9c71SJan Beulich rx->offset, rx->status, PAGE_SIZE); 10680d160211SJeremy Fitzhardinge 10690d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 10700d160211SJeremy Fitzhardinge kfree_skb(nskb); 10710d160211SJeremy Fitzhardinge } 10720d160211SJeremy Fitzhardinge 1073a761129eSDongli Zhang queue->rx.rsp_cons = cons; 1074a761129eSDongli Zhang 1075a761129eSDongli Zhang return 0; 10760d160211SJeremy Fitzhardinge } 10770d160211SJeremy Fitzhardinge 1078e0ce4af9SIan Campbell static int checksum_setup(struct net_device *dev, struct sk_buff *skb) 10790d160211SJeremy Fitzhardinge { 1080b5cf66cdSPaul Durrant bool recalculate_partial_csum = false; 1081e0ce4af9SIan Campbell 1082e0ce4af9SIan Campbell /* 1083e0ce4af9SIan Campbell * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy 1084e0ce4af9SIan Campbell * peers can fail to set NETRXF_csum_blank when sending a GSO 1085e0ce4af9SIan Campbell * frame. In this case force the SKB to CHECKSUM_PARTIAL and 1086e0ce4af9SIan Campbell * recalculate the partial checksum. 1087e0ce4af9SIan Campbell */ 1088e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { 1089e0ce4af9SIan Campbell struct netfront_info *np = netdev_priv(dev); 10902688fcb7SAndrew J. Bennieston atomic_inc(&np->rx_gso_checksum_fixup); 1091e0ce4af9SIan Campbell skb->ip_summed = CHECKSUM_PARTIAL; 1092b5cf66cdSPaul Durrant recalculate_partial_csum = true; 1093e0ce4af9SIan Campbell } 1094e0ce4af9SIan Campbell 1095e0ce4af9SIan Campbell /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ 1096e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL) 1097e0ce4af9SIan Campbell return 0; 10980d160211SJeremy Fitzhardinge 1099b5cf66cdSPaul Durrant return skb_checksum_setup(skb, recalculate_partial_csum); 11000d160211SJeremy Fitzhardinge } 11010d160211SJeremy Fitzhardinge 11022688fcb7SAndrew J. Bennieston static int handle_incoming_queue(struct netfront_queue *queue, 11030d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 11040d160211SJeremy Fitzhardinge { 1105900e1833SDavid Vrabel struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); 11060d160211SJeremy Fitzhardinge int packets_dropped = 0; 11070d160211SJeremy Fitzhardinge struct sk_buff *skb; 11080d160211SJeremy Fitzhardinge 11090d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 11103683243bSIan Campbell int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 11110d160211SJeremy Fitzhardinge 1112093b9c71SJan Beulich if (pull_to > skb_headlen(skb)) 11133683243bSIan Campbell __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 11140d160211SJeremy Fitzhardinge 11150d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 11162688fcb7SAndrew J. Bennieston skb->protocol = eth_type_trans(skb, queue->info->netdev); 1117d554f73dSWei Liu skb_reset_network_header(skb); 11180d160211SJeremy Fitzhardinge 11192688fcb7SAndrew J. Bennieston if (checksum_setup(queue->info->netdev, skb)) { 11200d160211SJeremy Fitzhardinge kfree_skb(skb); 11210d160211SJeremy Fitzhardinge packets_dropped++; 11222688fcb7SAndrew J. Bennieston queue->info->netdev->stats.rx_errors++; 11230d160211SJeremy Fitzhardinge continue; 11240d160211SJeremy Fitzhardinge } 11250d160211SJeremy Fitzhardinge 1126900e1833SDavid Vrabel u64_stats_update_begin(&rx_stats->syncp); 1127900e1833SDavid Vrabel rx_stats->packets++; 1128900e1833SDavid Vrabel rx_stats->bytes += skb->len; 1129900e1833SDavid Vrabel u64_stats_update_end(&rx_stats->syncp); 11300d160211SJeremy Fitzhardinge 11310d160211SJeremy Fitzhardinge /* Pass it up. */ 11322688fcb7SAndrew J. Bennieston napi_gro_receive(&queue->napi, skb); 11330d160211SJeremy Fitzhardinge } 11340d160211SJeremy Fitzhardinge 11350d160211SJeremy Fitzhardinge return packets_dropped; 11360d160211SJeremy Fitzhardinge } 11370d160211SJeremy Fitzhardinge 1138bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 11390d160211SJeremy Fitzhardinge { 11402688fcb7SAndrew J. Bennieston struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); 11412688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 11420d160211SJeremy Fitzhardinge struct sk_buff *skb; 11430d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 11440d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 11450d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 11460d160211SJeremy Fitzhardinge RING_IDX i, rp; 1147bea3348eSStephen Hemminger int work_done; 11480d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 11490d160211SJeremy Fitzhardinge struct sk_buff_head errq; 11500d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 11510d160211SJeremy Fitzhardinge int err; 11526c5aa6fcSDenis Kirjanov bool need_xdp_flush = false; 11530d160211SJeremy Fitzhardinge 11542688fcb7SAndrew J. Bennieston spin_lock(&queue->rx_lock); 11550d160211SJeremy Fitzhardinge 11560d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 11570d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 11580d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 11590d160211SJeremy Fitzhardinge 11602688fcb7SAndrew J. Bennieston rp = queue->rx.sring->rsp_prod; 11610d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 11620d160211SJeremy Fitzhardinge 11632688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 11640d160211SJeremy Fitzhardinge work_done = 0; 11650d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 11662688fcb7SAndrew J. Bennieston memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx)); 11670d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 11680d160211SJeremy Fitzhardinge 11696c5aa6fcSDenis Kirjanov err = xennet_get_responses(queue, &rinfo, rp, &tmpq, 11706c5aa6fcSDenis Kirjanov &need_xdp_flush); 11710d160211SJeremy Fitzhardinge 11720d160211SJeremy Fitzhardinge if (unlikely(err)) { 11730d160211SJeremy Fitzhardinge err: 11740d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 11750d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 117609f75cd7SJeff Garzik dev->stats.rx_errors++; 11772688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 11780d160211SJeremy Fitzhardinge continue; 11790d160211SJeremy Fitzhardinge } 11800d160211SJeremy Fitzhardinge 11810d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 11820d160211SJeremy Fitzhardinge 11830d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 11840d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 11850d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 11860d160211SJeremy Fitzhardinge 11870d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 11880d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 11892688fcb7SAndrew J. Bennieston queue->rx.rsp_cons += skb_queue_len(&tmpq); 11900d160211SJeremy Fitzhardinge goto err; 11910d160211SJeremy Fitzhardinge } 11920d160211SJeremy Fitzhardinge } 11930d160211SJeremy Fitzhardinge 11943683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = rx->status; 11953683243bSIan Campbell if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) 11963683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; 11970d160211SJeremy Fitzhardinge 1198b54c9d5bSJonathan Lemon skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset); 11993683243bSIan Campbell skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); 12003683243bSIan Campbell skb->data_len = rx->status; 1201093b9c71SJan Beulich skb->len += rx->status; 12020d160211SJeremy Fitzhardinge 1203a761129eSDongli Zhang if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) 1204ad4f15dcSJuergen Gross goto err; 12050d160211SJeremy Fitzhardinge 1206f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_csum_blank) 12070d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 1208f942dc25SIan Campbell else if (rx->flags & XEN_NETRXF_data_validated) 12090d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 12100d160211SJeremy Fitzhardinge 12110d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 12120d160211SJeremy Fitzhardinge 1213a761129eSDongli Zhang i = ++queue->rx.rsp_cons; 12140d160211SJeremy Fitzhardinge work_done++; 12150d160211SJeremy Fitzhardinge } 12166c5aa6fcSDenis Kirjanov if (need_xdp_flush) 12176c5aa6fcSDenis Kirjanov xdp_do_flush(); 12180d160211SJeremy Fitzhardinge 121956cfe5d0SWang Chen __skb_queue_purge(&errq); 12200d160211SJeremy Fitzhardinge 12212688fcb7SAndrew J. Bennieston work_done -= handle_incoming_queue(queue, &rxq); 12220d160211SJeremy Fitzhardinge 12232688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 12240d160211SJeremy Fitzhardinge 12250d160211SJeremy Fitzhardinge if (work_done < budget) { 1226bea3348eSStephen Hemminger int more_to_do = 0; 1227bea3348eSStephen Hemminger 12286ad20165SEric Dumazet napi_complete_done(napi, work_done); 12290d160211SJeremy Fitzhardinge 12302688fcb7SAndrew J. Bennieston RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); 12316a6dc08fSDavid Vrabel if (more_to_do) 12326a6dc08fSDavid Vrabel napi_schedule(napi); 12330d160211SJeremy Fitzhardinge } 12340d160211SJeremy Fitzhardinge 12352688fcb7SAndrew J. Bennieston spin_unlock(&queue->rx_lock); 12360d160211SJeremy Fitzhardinge 1237bea3348eSStephen Hemminger return work_done; 12380d160211SJeremy Fitzhardinge } 12390d160211SJeremy Fitzhardinge 12400d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 12410d160211SJeremy Fitzhardinge { 12420c36820eSJonathan Davies int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; 12430d160211SJeremy Fitzhardinge 12440d160211SJeremy Fitzhardinge if (mtu > max) 12450d160211SJeremy Fitzhardinge return -EINVAL; 12460d160211SJeremy Fitzhardinge dev->mtu = mtu; 12470d160211SJeremy Fitzhardinge return 0; 12480d160211SJeremy Fitzhardinge } 12490d160211SJeremy Fitzhardinge 1250bc1f4470Sstephen hemminger static void xennet_get_stats64(struct net_device *dev, 1251e00f85beSstephen hemminger struct rtnl_link_stats64 *tot) 1252e00f85beSstephen hemminger { 1253e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 1254e00f85beSstephen hemminger int cpu; 1255e00f85beSstephen hemminger 1256e00f85beSstephen hemminger for_each_possible_cpu(cpu) { 1257900e1833SDavid Vrabel struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); 1258900e1833SDavid Vrabel struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); 1259e00f85beSstephen hemminger u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1260e00f85beSstephen hemminger unsigned int start; 1261e00f85beSstephen hemminger 1262e00f85beSstephen hemminger do { 1263900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&tx_stats->syncp); 1264900e1833SDavid Vrabel tx_packets = tx_stats->packets; 1265900e1833SDavid Vrabel tx_bytes = tx_stats->bytes; 1266900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); 1267e00f85beSstephen hemminger 1268900e1833SDavid Vrabel do { 1269900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&rx_stats->syncp); 1270900e1833SDavid Vrabel rx_packets = rx_stats->packets; 1271900e1833SDavid Vrabel rx_bytes = rx_stats->bytes; 1272900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); 1273e00f85beSstephen hemminger 1274e00f85beSstephen hemminger tot->rx_packets += rx_packets; 1275e00f85beSstephen hemminger tot->tx_packets += tx_packets; 1276e00f85beSstephen hemminger tot->rx_bytes += rx_bytes; 1277e00f85beSstephen hemminger tot->tx_bytes += tx_bytes; 1278e00f85beSstephen hemminger } 1279e00f85beSstephen hemminger 1280e00f85beSstephen hemminger tot->rx_errors = dev->stats.rx_errors; 1281e00f85beSstephen hemminger tot->tx_dropped = dev->stats.tx_dropped; 1282e00f85beSstephen hemminger } 1283e00f85beSstephen hemminger 12842688fcb7SAndrew J. Bennieston static void xennet_release_tx_bufs(struct netfront_queue *queue) 12850d160211SJeremy Fitzhardinge { 12860d160211SJeremy Fitzhardinge struct sk_buff *skb; 12870d160211SJeremy Fitzhardinge int i; 12880d160211SJeremy Fitzhardinge 12890d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 12900d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 12912688fcb7SAndrew J. Bennieston if (skb_entry_is_link(&queue->tx_skbs[i])) 12920d160211SJeremy Fitzhardinge continue; 12930d160211SJeremy Fitzhardinge 12942688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[i].skb; 12952688fcb7SAndrew J. Bennieston get_page(queue->grant_tx_page[i]); 12962688fcb7SAndrew J. Bennieston gnttab_end_foreign_access(queue->grant_tx_ref[i], 1297cefe0078SAnnie Li GNTMAP_readonly, 12982688fcb7SAndrew J. Bennieston (unsigned long)page_address(queue->grant_tx_page[i])); 12992688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 13002688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 13012688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i); 13020d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 13030d160211SJeremy Fitzhardinge } 13040d160211SJeremy Fitzhardinge } 13050d160211SJeremy Fitzhardinge 13062688fcb7SAndrew J. Bennieston static void xennet_release_rx_bufs(struct netfront_queue *queue) 13070d160211SJeremy Fitzhardinge { 13080d160211SJeremy Fitzhardinge int id, ref; 13090d160211SJeremy Fitzhardinge 13102688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 13110d160211SJeremy Fitzhardinge 13120d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 1313cefe0078SAnnie Li struct sk_buff *skb; 1314cefe0078SAnnie Li struct page *page; 13150d160211SJeremy Fitzhardinge 13162688fcb7SAndrew J. Bennieston skb = queue->rx_skbs[id]; 1317cefe0078SAnnie Li if (!skb) 1318cefe0078SAnnie Li continue; 1319cefe0078SAnnie Li 13202688fcb7SAndrew J. Bennieston ref = queue->grant_rx_ref[id]; 1321cefe0078SAnnie Li if (ref == GRANT_INVALID_REF) 1322cefe0078SAnnie Li continue; 1323cefe0078SAnnie Li 1324cefe0078SAnnie Li page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 1325cefe0078SAnnie Li 1326cefe0078SAnnie Li /* gnttab_end_foreign_access() needs a page ref until 1327cefe0078SAnnie Li * foreign access is ended (which may be deferred). 1328cefe0078SAnnie Li */ 1329cefe0078SAnnie Li get_page(page); 1330cefe0078SAnnie Li gnttab_end_foreign_access(ref, 0, 1331cefe0078SAnnie Li (unsigned long)page_address(page)); 13322688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = GRANT_INVALID_REF; 13330d160211SJeremy Fitzhardinge 1334cefe0078SAnnie Li kfree_skb(skb); 13350d160211SJeremy Fitzhardinge } 13360d160211SJeremy Fitzhardinge 13372688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 13380d160211SJeremy Fitzhardinge } 13390d160211SJeremy Fitzhardinge 1340c8f44affSMichał Mirosław static netdev_features_t xennet_fix_features(struct net_device *dev, 1341c8f44affSMichał Mirosław netdev_features_t features) 13428f7b01a1SEric Dumazet { 13438f7b01a1SEric Dumazet struct netfront_info *np = netdev_priv(dev); 13448f7b01a1SEric Dumazet 13452890ea5cSJuergen Gross if (features & NETIF_F_SG && 13462890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) 13478f7b01a1SEric Dumazet features &= ~NETIF_F_SG; 13488f7b01a1SEric Dumazet 13492890ea5cSJuergen Gross if (features & NETIF_F_IPV6_CSUM && 13502890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, 13512890ea5cSJuergen Gross "feature-ipv6-csum-offload", 0)) 13522c0057deSPaul Durrant features &= ~NETIF_F_IPV6_CSUM; 13532c0057deSPaul Durrant 13542890ea5cSJuergen Gross if (features & NETIF_F_TSO && 13552890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) 13568f7b01a1SEric Dumazet features &= ~NETIF_F_TSO; 13578f7b01a1SEric Dumazet 13582890ea5cSJuergen Gross if (features & NETIF_F_TSO6 && 13592890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) 13602c0057deSPaul Durrant features &= ~NETIF_F_TSO6; 13612c0057deSPaul Durrant 13628f7b01a1SEric Dumazet return features; 13638f7b01a1SEric Dumazet } 13648f7b01a1SEric Dumazet 1365c8f44affSMichał Mirosław static int xennet_set_features(struct net_device *dev, 1366c8f44affSMichał Mirosław netdev_features_t features) 13678f7b01a1SEric Dumazet { 13688f7b01a1SEric Dumazet if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { 13698f7b01a1SEric Dumazet netdev_info(dev, "Reducing MTU because no SG offload"); 13708f7b01a1SEric Dumazet dev->mtu = ETH_DATA_LEN; 13718f7b01a1SEric Dumazet } 13728f7b01a1SEric Dumazet 13738f7b01a1SEric Dumazet return 0; 13748f7b01a1SEric Dumazet } 13758f7b01a1SEric Dumazet 1376d634bf2cSWei Liu static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) 1377cf66f9d4SKonrad Rzeszutek Wilk { 13782688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 1379cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 1380cf66f9d4SKonrad Rzeszutek Wilk 13812688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 13822688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 13832688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 1384cf66f9d4SKonrad Rzeszutek Wilk 1385cf66f9d4SKonrad Rzeszutek Wilk return IRQ_HANDLED; 1386cf66f9d4SKonrad Rzeszutek Wilk } 1387cf66f9d4SKonrad Rzeszutek Wilk 1388d634bf2cSWei Liu static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) 1389d634bf2cSWei Liu { 13902688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 13912688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 1392d634bf2cSWei Liu 1393d634bf2cSWei Liu if (likely(netif_carrier_ok(dev) && 13942688fcb7SAndrew J. Bennieston RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) 13952688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 1396d634bf2cSWei Liu 1397d634bf2cSWei Liu return IRQ_HANDLED; 1398d634bf2cSWei Liu } 1399d634bf2cSWei Liu 1400d634bf2cSWei Liu static irqreturn_t xennet_interrupt(int irq, void *dev_id) 1401d634bf2cSWei Liu { 1402d634bf2cSWei Liu xennet_tx_interrupt(irq, dev_id); 1403d634bf2cSWei Liu xennet_rx_interrupt(irq, dev_id); 1404d634bf2cSWei Liu return IRQ_HANDLED; 1405d634bf2cSWei Liu } 1406d634bf2cSWei Liu 1407cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1408cf66f9d4SKonrad Rzeszutek Wilk static void xennet_poll_controller(struct net_device *dev) 1409cf66f9d4SKonrad Rzeszutek Wilk { 14102688fcb7SAndrew J. Bennieston /* Poll each queue */ 14112688fcb7SAndrew J. Bennieston struct netfront_info *info = netdev_priv(dev); 14122688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 14132688fcb7SAndrew J. Bennieston unsigned int i; 14142688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) 14152688fcb7SAndrew J. Bennieston xennet_interrupt(0, &info->queues[i]); 1416cf66f9d4SKonrad Rzeszutek Wilk } 1417cf66f9d4SKonrad Rzeszutek Wilk #endif 1418cf66f9d4SKonrad Rzeszutek Wilk 14196c5aa6fcSDenis Kirjanov #define NETBACK_XDP_HEADROOM_DISABLE 0 14206c5aa6fcSDenis Kirjanov #define NETBACK_XDP_HEADROOM_ENABLE 1 14216c5aa6fcSDenis Kirjanov 14226c5aa6fcSDenis Kirjanov static int talk_to_netback_xdp(struct netfront_info *np, int xdp) 14236c5aa6fcSDenis Kirjanov { 14246c5aa6fcSDenis Kirjanov int err; 14256c5aa6fcSDenis Kirjanov unsigned short headroom; 14266c5aa6fcSDenis Kirjanov 14276c5aa6fcSDenis Kirjanov headroom = xdp ? XDP_PACKET_HEADROOM : 0; 14286c5aa6fcSDenis Kirjanov err = xenbus_printf(XBT_NIL, np->xbdev->nodename, 14296c5aa6fcSDenis Kirjanov "xdp-headroom", "%hu", 14306c5aa6fcSDenis Kirjanov headroom); 14316c5aa6fcSDenis Kirjanov if (err) 14326c5aa6fcSDenis Kirjanov pr_warn("Error writing xdp-headroom\n"); 14336c5aa6fcSDenis Kirjanov 14346c5aa6fcSDenis Kirjanov return err; 14356c5aa6fcSDenis Kirjanov } 14366c5aa6fcSDenis Kirjanov 14376c5aa6fcSDenis Kirjanov static int xennet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 14386c5aa6fcSDenis Kirjanov struct netlink_ext_ack *extack) 14396c5aa6fcSDenis Kirjanov { 14406c5aa6fcSDenis Kirjanov unsigned long max_mtu = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM; 14416c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 14426c5aa6fcSDenis Kirjanov struct bpf_prog *old_prog; 14436c5aa6fcSDenis Kirjanov unsigned int i, err; 14446c5aa6fcSDenis Kirjanov 14456c5aa6fcSDenis Kirjanov if (dev->mtu > max_mtu) { 14466c5aa6fcSDenis Kirjanov netdev_warn(dev, "XDP requires MTU less than %lu\n", max_mtu); 14476c5aa6fcSDenis Kirjanov return -EINVAL; 14486c5aa6fcSDenis Kirjanov } 14496c5aa6fcSDenis Kirjanov 14506c5aa6fcSDenis Kirjanov if (!np->netback_has_xdp_headroom) 14516c5aa6fcSDenis Kirjanov return 0; 14526c5aa6fcSDenis Kirjanov 14536c5aa6fcSDenis Kirjanov xenbus_switch_state(np->xbdev, XenbusStateReconfiguring); 14546c5aa6fcSDenis Kirjanov 14556c5aa6fcSDenis Kirjanov err = talk_to_netback_xdp(np, prog ? NETBACK_XDP_HEADROOM_ENABLE : 14566c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_DISABLE); 14576c5aa6fcSDenis Kirjanov if (err) 14586c5aa6fcSDenis Kirjanov return err; 14596c5aa6fcSDenis Kirjanov 14606c5aa6fcSDenis Kirjanov /* avoid the race with XDP headroom adjustment */ 14616c5aa6fcSDenis Kirjanov wait_event(module_wq, 14626c5aa6fcSDenis Kirjanov xenbus_read_driver_state(np->xbdev->otherend) == 14636c5aa6fcSDenis Kirjanov XenbusStateReconfigured); 14646c5aa6fcSDenis Kirjanov np->netfront_xdp_enabled = true; 14656c5aa6fcSDenis Kirjanov 14666c5aa6fcSDenis Kirjanov old_prog = rtnl_dereference(np->queues[0].xdp_prog); 14676c5aa6fcSDenis Kirjanov 14686c5aa6fcSDenis Kirjanov if (prog) 14696c5aa6fcSDenis Kirjanov bpf_prog_add(prog, dev->real_num_tx_queues); 14706c5aa6fcSDenis Kirjanov 14716c5aa6fcSDenis Kirjanov for (i = 0; i < dev->real_num_tx_queues; ++i) 14726c5aa6fcSDenis Kirjanov rcu_assign_pointer(np->queues[i].xdp_prog, prog); 14736c5aa6fcSDenis Kirjanov 14746c5aa6fcSDenis Kirjanov if (old_prog) 14756c5aa6fcSDenis Kirjanov for (i = 0; i < dev->real_num_tx_queues; ++i) 14766c5aa6fcSDenis Kirjanov bpf_prog_put(old_prog); 14776c5aa6fcSDenis Kirjanov 14786c5aa6fcSDenis Kirjanov xenbus_switch_state(np->xbdev, XenbusStateConnected); 14796c5aa6fcSDenis Kirjanov 14806c5aa6fcSDenis Kirjanov return 0; 14816c5aa6fcSDenis Kirjanov } 14826c5aa6fcSDenis Kirjanov 14836c5aa6fcSDenis Kirjanov static int xennet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 14846c5aa6fcSDenis Kirjanov { 14856c5aa6fcSDenis Kirjanov switch (xdp->command) { 14866c5aa6fcSDenis Kirjanov case XDP_SETUP_PROG: 14876c5aa6fcSDenis Kirjanov return xennet_xdp_set(dev, xdp->prog, xdp->extack); 14886c5aa6fcSDenis Kirjanov default: 14896c5aa6fcSDenis Kirjanov return -EINVAL; 14906c5aa6fcSDenis Kirjanov } 14916c5aa6fcSDenis Kirjanov } 14926c5aa6fcSDenis Kirjanov 14930a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 14940a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 14950a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 14960a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 14970a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 1498e00f85beSstephen hemminger .ndo_get_stats64 = xennet_get_stats64, 14990a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 15000a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 1501fb507934SMichał Mirosław .ndo_fix_features = xennet_fix_features, 1502fb507934SMichał Mirosław .ndo_set_features = xennet_set_features, 15032688fcb7SAndrew J. Bennieston .ndo_select_queue = xennet_select_queue, 15046c5aa6fcSDenis Kirjanov .ndo_bpf = xennet_xdp, 15056c5aa6fcSDenis Kirjanov .ndo_xdp_xmit = xennet_xdp_xmit, 1506cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1507cf66f9d4SKonrad Rzeszutek Wilk .ndo_poll_controller = xennet_poll_controller, 1508cf66f9d4SKonrad Rzeszutek Wilk #endif 15090a0b9d2eSStephen Hemminger }; 15100a0b9d2eSStephen Hemminger 1511900e1833SDavid Vrabel static void xennet_free_netdev(struct net_device *netdev) 1512900e1833SDavid Vrabel { 1513900e1833SDavid Vrabel struct netfront_info *np = netdev_priv(netdev); 1514900e1833SDavid Vrabel 1515900e1833SDavid Vrabel free_percpu(np->rx_stats); 1516900e1833SDavid Vrabel free_percpu(np->tx_stats); 1517900e1833SDavid Vrabel free_netdev(netdev); 1518900e1833SDavid Vrabel } 1519900e1833SDavid Vrabel 15208e0e46bbSBill Pemberton static struct net_device *xennet_create_dev(struct xenbus_device *dev) 15210d160211SJeremy Fitzhardinge { 15222688fcb7SAndrew J. Bennieston int err; 15230d160211SJeremy Fitzhardinge struct net_device *netdev; 15240d160211SJeremy Fitzhardinge struct netfront_info *np; 15250d160211SJeremy Fitzhardinge 152650ee6061SAndrew J. Bennieston netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); 152741de8d4cSJoe Perches if (!netdev) 15280d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 15290d160211SJeremy Fitzhardinge 15300d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 15310d160211SJeremy Fitzhardinge np->xbdev = dev; 15320d160211SJeremy Fitzhardinge 15332688fcb7SAndrew J. Bennieston np->queues = NULL; 15340d160211SJeremy Fitzhardinge 1535e00f85beSstephen hemminger err = -ENOMEM; 1536900e1833SDavid Vrabel np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1537900e1833SDavid Vrabel if (np->rx_stats == NULL) 1538900e1833SDavid Vrabel goto exit; 1539900e1833SDavid Vrabel np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1540900e1833SDavid Vrabel if (np->tx_stats == NULL) 1541e00f85beSstephen hemminger goto exit; 1542e00f85beSstephen hemminger 15430a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 15440a0b9d2eSStephen Hemminger 1545fb507934SMichał Mirosław netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | 1546fb507934SMichał Mirosław NETIF_F_GSO_ROBUST; 15472c0057deSPaul Durrant netdev->hw_features = NETIF_F_SG | 15482c0057deSPaul Durrant NETIF_F_IPV6_CSUM | 15492c0057deSPaul Durrant NETIF_F_TSO | NETIF_F_TSO6; 15500d160211SJeremy Fitzhardinge 1551fc3e5941SIan Campbell /* 1552fc3e5941SIan Campbell * Assume that all hw features are available for now. This set 1553fc3e5941SIan Campbell * will be adjusted by the call to netdev_update_features() in 1554fc3e5941SIan Campbell * xennet_connect() which is the earliest point where we can 1555fc3e5941SIan Campbell * negotiate with the backend regarding supported features. 1556fc3e5941SIan Campbell */ 1557fc3e5941SIan Campbell netdev->features |= netdev->hw_features; 1558fc3e5941SIan Campbell 15597ad24ea4SWilfried Klaebe netdev->ethtool_ops = &xennet_ethtool_ops; 1560e1043a4bSMohammed Gamal netdev->min_mtu = ETH_MIN_MTU; 1561d0c2c997SJarod Wilson netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; 15620d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 15630d160211SJeremy Fitzhardinge 15640d160211SJeremy Fitzhardinge np->netdev = netdev; 15656c5aa6fcSDenis Kirjanov np->netfront_xdp_enabled = false; 15660d160211SJeremy Fitzhardinge 15670d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 15680d160211SJeremy Fitzhardinge 1569c2c63310SAndrea Righi do { 1570b707fda2SEduardo Otubo xenbus_switch_state(dev, XenbusStateInitialising); 1571c2c63310SAndrea Righi err = wait_event_timeout(module_wq, 1572822fb18aSXiao Liang xenbus_read_driver_state(dev->otherend) != 1573822fb18aSXiao Liang XenbusStateClosed && 1574822fb18aSXiao Liang xenbus_read_driver_state(dev->otherend) != 1575c2c63310SAndrea Righi XenbusStateUnknown, XENNET_TIMEOUT); 1576c2c63310SAndrea Righi } while (!err); 1577c2c63310SAndrea Righi 15780d160211SJeremy Fitzhardinge return netdev; 15790d160211SJeremy Fitzhardinge 15800d160211SJeremy Fitzhardinge exit: 1581900e1833SDavid Vrabel xennet_free_netdev(netdev); 15820d160211SJeremy Fitzhardinge return ERR_PTR(err); 15830d160211SJeremy Fitzhardinge } 15840d160211SJeremy Fitzhardinge 15850d160211SJeremy Fitzhardinge /** 15860d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 15870d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 15880d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 15890d160211SJeremy Fitzhardinge */ 15908e0e46bbSBill Pemberton static int netfront_probe(struct xenbus_device *dev, 15910d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 15920d160211SJeremy Fitzhardinge { 15930d160211SJeremy Fitzhardinge int err; 15940d160211SJeremy Fitzhardinge struct net_device *netdev; 15950d160211SJeremy Fitzhardinge struct netfront_info *info; 15960d160211SJeremy Fitzhardinge 15970d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 15980d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 15990d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 16000d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 16010d160211SJeremy Fitzhardinge return err; 16020d160211SJeremy Fitzhardinge } 16030d160211SJeremy Fitzhardinge 16040d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 16051b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 160627b917e5STakashi Iwai #ifdef CONFIG_SYSFS 160727b917e5STakashi Iwai info->netdev->sysfs_groups[0] = &xennet_dev_group; 160827b917e5STakashi Iwai #endif 16090d160211SJeremy Fitzhardinge 16100d160211SJeremy Fitzhardinge return 0; 16110d160211SJeremy Fitzhardinge } 16120d160211SJeremy Fitzhardinge 16130d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 16140d160211SJeremy Fitzhardinge { 16150d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 16160d160211SJeremy Fitzhardinge if (ref != GRANT_INVALID_REF) 16170d160211SJeremy Fitzhardinge gnttab_end_foreign_access(ref, 0, (unsigned long)page); 16180d160211SJeremy Fitzhardinge } 16190d160211SJeremy Fitzhardinge 16200d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 16210d160211SJeremy Fitzhardinge { 16222688fcb7SAndrew J. Bennieston unsigned int i = 0; 16232688fcb7SAndrew J. Bennieston unsigned int num_queues = info->netdev->real_num_tx_queues; 16240d160211SJeremy Fitzhardinge 1625f9feb1e6SDavid Vrabel netif_carrier_off(info->netdev); 1626f9feb1e6SDavid Vrabel 16279a873c71SChas Williams for (i = 0; i < num_queues && info->queues; ++i) { 162876541869SDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 162976541869SDavid Vrabel 163074470954SBoris Ostrovsky del_timer_sync(&queue->rx_refill_timer); 163174470954SBoris Ostrovsky 16322688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) 16332688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 16342688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { 16352688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 16362688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->rx_irq, queue); 1637d634bf2cSWei Liu } 16382688fcb7SAndrew J. Bennieston queue->tx_evtchn = queue->rx_evtchn = 0; 16392688fcb7SAndrew J. Bennieston queue->tx_irq = queue->rx_irq = 0; 16400d160211SJeremy Fitzhardinge 1641274b0455SChas Williams if (netif_running(info->netdev)) 1642f9feb1e6SDavid Vrabel napi_synchronize(&queue->napi); 1643f9feb1e6SDavid Vrabel 1644a5b5dc3cSDavid Vrabel xennet_release_tx_bufs(queue); 1645a5b5dc3cSDavid Vrabel xennet_release_rx_bufs(queue); 1646a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_tx_head); 1647a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_rx_head); 1648a5b5dc3cSDavid Vrabel 16490d160211SJeremy Fitzhardinge /* End access and free the pages */ 16502688fcb7SAndrew J. Bennieston xennet_end_access(queue->tx_ring_ref, queue->tx.sring); 16512688fcb7SAndrew J. Bennieston xennet_end_access(queue->rx_ring_ref, queue->rx.sring); 16520d160211SJeremy Fitzhardinge 16532688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 16542688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 16552688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 16562688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 16576c5aa6fcSDenis Kirjanov 16586c5aa6fcSDenis Kirjanov page_pool_destroy(queue->page_pool); 16592688fcb7SAndrew J. Bennieston } 16600d160211SJeremy Fitzhardinge } 16610d160211SJeremy Fitzhardinge 16620d160211SJeremy Fitzhardinge /** 16630d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 16640d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 16650d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 16660d160211SJeremy Fitzhardinge * rest of the kernel. 16670d160211SJeremy Fitzhardinge */ 16680d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 16690d160211SJeremy Fitzhardinge { 16701b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 16710d160211SJeremy Fitzhardinge 16720d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 16730d160211SJeremy Fitzhardinge 16740d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 16750d160211SJeremy Fitzhardinge return 0; 16760d160211SJeremy Fitzhardinge } 16770d160211SJeremy Fitzhardinge 16780d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 16790d160211SJeremy Fitzhardinge { 16800d160211SJeremy Fitzhardinge char *s, *e, *macstr; 16810d160211SJeremy Fitzhardinge int i; 16820d160211SJeremy Fitzhardinge 16830d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 16840d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 16850d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 16860d160211SJeremy Fitzhardinge 16870d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 16880d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 16890d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 16900d160211SJeremy Fitzhardinge kfree(macstr); 16910d160211SJeremy Fitzhardinge return -ENOENT; 16920d160211SJeremy Fitzhardinge } 16930d160211SJeremy Fitzhardinge s = e+1; 16940d160211SJeremy Fitzhardinge } 16950d160211SJeremy Fitzhardinge 16960d160211SJeremy Fitzhardinge kfree(macstr); 16970d160211SJeremy Fitzhardinge return 0; 16980d160211SJeremy Fitzhardinge } 16990d160211SJeremy Fitzhardinge 17002688fcb7SAndrew J. Bennieston static int setup_netfront_single(struct netfront_queue *queue) 1701d634bf2cSWei Liu { 1702d634bf2cSWei Liu int err; 1703d634bf2cSWei Liu 17042688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1705d634bf2cSWei Liu if (err < 0) 1706d634bf2cSWei Liu goto fail; 1707d634bf2cSWei Liu 17082688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1709d634bf2cSWei Liu xennet_interrupt, 17102688fcb7SAndrew J. Bennieston 0, queue->info->netdev->name, queue); 1711d634bf2cSWei Liu if (err < 0) 1712d634bf2cSWei Liu goto bind_fail; 17132688fcb7SAndrew J. Bennieston queue->rx_evtchn = queue->tx_evtchn; 17142688fcb7SAndrew J. Bennieston queue->rx_irq = queue->tx_irq = err; 1715d634bf2cSWei Liu 1716d634bf2cSWei Liu return 0; 1717d634bf2cSWei Liu 1718d634bf2cSWei Liu bind_fail: 17192688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 17202688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1721d634bf2cSWei Liu fail: 1722d634bf2cSWei Liu return err; 1723d634bf2cSWei Liu } 1724d634bf2cSWei Liu 17252688fcb7SAndrew J. Bennieston static int setup_netfront_split(struct netfront_queue *queue) 1726d634bf2cSWei Liu { 1727d634bf2cSWei Liu int err; 1728d634bf2cSWei Liu 17292688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1730d634bf2cSWei Liu if (err < 0) 1731d634bf2cSWei Liu goto fail; 17322688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); 1733d634bf2cSWei Liu if (err < 0) 1734d634bf2cSWei Liu goto alloc_rx_evtchn_fail; 1735d634bf2cSWei Liu 17362688fcb7SAndrew J. Bennieston snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 17372688fcb7SAndrew J. Bennieston "%s-tx", queue->name); 17382688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1739d634bf2cSWei Liu xennet_tx_interrupt, 17402688fcb7SAndrew J. Bennieston 0, queue->tx_irq_name, queue); 1741d634bf2cSWei Liu if (err < 0) 1742d634bf2cSWei Liu goto bind_tx_fail; 17432688fcb7SAndrew J. Bennieston queue->tx_irq = err; 1744d634bf2cSWei Liu 17452688fcb7SAndrew J. Bennieston snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 17462688fcb7SAndrew J. Bennieston "%s-rx", queue->name); 17472688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->rx_evtchn, 1748d634bf2cSWei Liu xennet_rx_interrupt, 17492688fcb7SAndrew J. Bennieston 0, queue->rx_irq_name, queue); 1750d634bf2cSWei Liu if (err < 0) 1751d634bf2cSWei Liu goto bind_rx_fail; 17522688fcb7SAndrew J. Bennieston queue->rx_irq = err; 1753d634bf2cSWei Liu 1754d634bf2cSWei Liu return 0; 1755d634bf2cSWei Liu 1756d634bf2cSWei Liu bind_rx_fail: 17572688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 17582688fcb7SAndrew J. Bennieston queue->tx_irq = 0; 1759d634bf2cSWei Liu bind_tx_fail: 17602688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); 17612688fcb7SAndrew J. Bennieston queue->rx_evtchn = 0; 1762d634bf2cSWei Liu alloc_rx_evtchn_fail: 17632688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 17642688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1765d634bf2cSWei Liu fail: 1766d634bf2cSWei Liu return err; 1767d634bf2cSWei Liu } 1768d634bf2cSWei Liu 17692688fcb7SAndrew J. Bennieston static int setup_netfront(struct xenbus_device *dev, 17702688fcb7SAndrew J. Bennieston struct netfront_queue *queue, unsigned int feature_split_evtchn) 17710d160211SJeremy Fitzhardinge { 17720d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 17730d160211SJeremy Fitzhardinge struct xen_netif_rx_sring *rxs; 1774ccc9d90aSWei Liu grant_ref_t gref; 17750d160211SJeremy Fitzhardinge int err; 17760d160211SJeremy Fitzhardinge 17772688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 17782688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 17792688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 17802688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 17810d160211SJeremy Fitzhardinge 1782a144ff09SIan Campbell txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 17830d160211SJeremy Fitzhardinge if (!txs) { 17840d160211SJeremy Fitzhardinge err = -ENOMEM; 17850d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating tx ring page"); 17860d160211SJeremy Fitzhardinge goto fail; 17870d160211SJeremy Fitzhardinge } 17880d160211SJeremy Fitzhardinge SHARED_RING_INIT(txs); 178930c5d7f0SJulien Grall FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); 17900d160211SJeremy Fitzhardinge 1791ccc9d90aSWei Liu err = xenbus_grant_ring(dev, txs, 1, &gref); 17921ca2983aSWei Liu if (err < 0) 17931ca2983aSWei Liu goto grant_tx_ring_fail; 1794ccc9d90aSWei Liu queue->tx_ring_ref = gref; 17950d160211SJeremy Fitzhardinge 1796a144ff09SIan Campbell rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 17970d160211SJeremy Fitzhardinge if (!rxs) { 17980d160211SJeremy Fitzhardinge err = -ENOMEM; 17990d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating rx ring page"); 18001ca2983aSWei Liu goto alloc_rx_ring_fail; 18010d160211SJeremy Fitzhardinge } 18020d160211SJeremy Fitzhardinge SHARED_RING_INIT(rxs); 180330c5d7f0SJulien Grall FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); 18040d160211SJeremy Fitzhardinge 1805ccc9d90aSWei Liu err = xenbus_grant_ring(dev, rxs, 1, &gref); 18061ca2983aSWei Liu if (err < 0) 18071ca2983aSWei Liu goto grant_rx_ring_fail; 1808ccc9d90aSWei Liu queue->rx_ring_ref = gref; 18090d160211SJeremy Fitzhardinge 1810d634bf2cSWei Liu if (feature_split_evtchn) 18112688fcb7SAndrew J. Bennieston err = setup_netfront_split(queue); 1812d634bf2cSWei Liu /* setup single event channel if 1813d634bf2cSWei Liu * a) feature-split-event-channels == 0 1814d634bf2cSWei Liu * b) feature-split-event-channels == 1 but failed to setup 1815d634bf2cSWei Liu */ 1816d634bf2cSWei Liu if (!feature_split_evtchn || (feature_split_evtchn && err)) 18172688fcb7SAndrew J. Bennieston err = setup_netfront_single(queue); 1818d634bf2cSWei Liu 18190d160211SJeremy Fitzhardinge if (err) 18201ca2983aSWei Liu goto alloc_evtchn_fail; 18210d160211SJeremy Fitzhardinge 18220d160211SJeremy Fitzhardinge return 0; 18230d160211SJeremy Fitzhardinge 18241ca2983aSWei Liu /* If we fail to setup netfront, it is safe to just revoke access to 18251ca2983aSWei Liu * granted pages because backend is not accessing it at this point. 18261ca2983aSWei Liu */ 18271ca2983aSWei Liu alloc_evtchn_fail: 18282688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); 18291ca2983aSWei Liu grant_rx_ring_fail: 18301ca2983aSWei Liu free_page((unsigned long)rxs); 18311ca2983aSWei Liu alloc_rx_ring_fail: 18322688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); 18331ca2983aSWei Liu grant_tx_ring_fail: 18341ca2983aSWei Liu free_page((unsigned long)txs); 18350d160211SJeremy Fitzhardinge fail: 18360d160211SJeremy Fitzhardinge return err; 18370d160211SJeremy Fitzhardinge } 18380d160211SJeremy Fitzhardinge 18392688fcb7SAndrew J. Bennieston /* Queue-specific initialisation 18402688fcb7SAndrew J. Bennieston * This used to be done in xennet_create_dev() but must now 18412688fcb7SAndrew J. Bennieston * be run per-queue. 18422688fcb7SAndrew J. Bennieston */ 18432688fcb7SAndrew J. Bennieston static int xennet_init_queue(struct netfront_queue *queue) 18442688fcb7SAndrew J. Bennieston { 18452688fcb7SAndrew J. Bennieston unsigned short i; 18462688fcb7SAndrew J. Bennieston int err = 0; 184721f2706bSXiao Liang char *devid; 18482688fcb7SAndrew J. Bennieston 18492688fcb7SAndrew J. Bennieston spin_lock_init(&queue->tx_lock); 18502688fcb7SAndrew J. Bennieston spin_lock_init(&queue->rx_lock); 18512688fcb7SAndrew J. Bennieston 1852e99e88a9SKees Cook timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0); 18532688fcb7SAndrew J. Bennieston 185421f2706bSXiao Liang devid = strrchr(queue->info->xbdev->nodename, '/') + 1; 185521f2706bSXiao Liang snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", 185621f2706bSXiao Liang devid, queue->id); 18578b715010SWei Liu 18582688fcb7SAndrew J. Bennieston /* Initialise tx_skbs as a free chain containing every entry. */ 18592688fcb7SAndrew J. Bennieston queue->tx_skb_freelist = 0; 18602688fcb7SAndrew J. Bennieston for (i = 0; i < NET_TX_RING_SIZE; i++) { 18612688fcb7SAndrew J. Bennieston skb_entry_set_link(&queue->tx_skbs[i], i+1); 18622688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 18632688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 18642688fcb7SAndrew J. Bennieston } 18652688fcb7SAndrew J. Bennieston 18662688fcb7SAndrew J. Bennieston /* Clear out rx_skbs */ 18672688fcb7SAndrew J. Bennieston for (i = 0; i < NET_RX_RING_SIZE; i++) { 18682688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 18692688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 18702688fcb7SAndrew J. Bennieston } 18712688fcb7SAndrew J. Bennieston 18722688fcb7SAndrew J. Bennieston /* A grant for every tx ring slot */ 18731f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, 18742688fcb7SAndrew J. Bennieston &queue->gref_tx_head) < 0) { 18752688fcb7SAndrew J. Bennieston pr_alert("can't alloc tx grant refs\n"); 18762688fcb7SAndrew J. Bennieston err = -ENOMEM; 18772688fcb7SAndrew J. Bennieston goto exit; 18782688fcb7SAndrew J. Bennieston } 18792688fcb7SAndrew J. Bennieston 18802688fcb7SAndrew J. Bennieston /* A grant for every rx ring slot */ 18811f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, 18822688fcb7SAndrew J. Bennieston &queue->gref_rx_head) < 0) { 18832688fcb7SAndrew J. Bennieston pr_alert("can't alloc rx grant refs\n"); 18842688fcb7SAndrew J. Bennieston err = -ENOMEM; 18852688fcb7SAndrew J. Bennieston goto exit_free_tx; 18862688fcb7SAndrew J. Bennieston } 18872688fcb7SAndrew J. Bennieston 18882688fcb7SAndrew J. Bennieston return 0; 18892688fcb7SAndrew J. Bennieston 18902688fcb7SAndrew J. Bennieston exit_free_tx: 18912688fcb7SAndrew J. Bennieston gnttab_free_grant_references(queue->gref_tx_head); 18922688fcb7SAndrew J. Bennieston exit: 18932688fcb7SAndrew J. Bennieston return err; 18942688fcb7SAndrew J. Bennieston } 18952688fcb7SAndrew J. Bennieston 189650ee6061SAndrew J. Bennieston static int write_queue_xenstore_keys(struct netfront_queue *queue, 189750ee6061SAndrew J. Bennieston struct xenbus_transaction *xbt, int write_hierarchical) 189850ee6061SAndrew J. Bennieston { 189950ee6061SAndrew J. Bennieston /* Write the queue-specific keys into XenStore in the traditional 190050ee6061SAndrew J. Bennieston * way for a single queue, or in a queue subkeys for multiple 190150ee6061SAndrew J. Bennieston * queues. 190250ee6061SAndrew J. Bennieston */ 190350ee6061SAndrew J. Bennieston struct xenbus_device *dev = queue->info->xbdev; 190450ee6061SAndrew J. Bennieston int err; 190550ee6061SAndrew J. Bennieston const char *message; 190650ee6061SAndrew J. Bennieston char *path; 190750ee6061SAndrew J. Bennieston size_t pathsize; 190850ee6061SAndrew J. Bennieston 190950ee6061SAndrew J. Bennieston /* Choose the correct place to write the keys */ 191050ee6061SAndrew J. Bennieston if (write_hierarchical) { 191150ee6061SAndrew J. Bennieston pathsize = strlen(dev->nodename) + 10; 191250ee6061SAndrew J. Bennieston path = kzalloc(pathsize, GFP_KERNEL); 191350ee6061SAndrew J. Bennieston if (!path) { 191450ee6061SAndrew J. Bennieston err = -ENOMEM; 191550ee6061SAndrew J. Bennieston message = "out of memory while writing ring references"; 191650ee6061SAndrew J. Bennieston goto error; 191750ee6061SAndrew J. Bennieston } 191850ee6061SAndrew J. Bennieston snprintf(path, pathsize, "%s/queue-%u", 191950ee6061SAndrew J. Bennieston dev->nodename, queue->id); 192050ee6061SAndrew J. Bennieston } else { 192150ee6061SAndrew J. Bennieston path = (char *)dev->nodename; 192250ee6061SAndrew J. Bennieston } 192350ee6061SAndrew J. Bennieston 192450ee6061SAndrew J. Bennieston /* Write ring references */ 192550ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", 192650ee6061SAndrew J. Bennieston queue->tx_ring_ref); 192750ee6061SAndrew J. Bennieston if (err) { 192850ee6061SAndrew J. Bennieston message = "writing tx-ring-ref"; 192950ee6061SAndrew J. Bennieston goto error; 193050ee6061SAndrew J. Bennieston } 193150ee6061SAndrew J. Bennieston 193250ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", 193350ee6061SAndrew J. Bennieston queue->rx_ring_ref); 193450ee6061SAndrew J. Bennieston if (err) { 193550ee6061SAndrew J. Bennieston message = "writing rx-ring-ref"; 193650ee6061SAndrew J. Bennieston goto error; 193750ee6061SAndrew J. Bennieston } 193850ee6061SAndrew J. Bennieston 193950ee6061SAndrew J. Bennieston /* Write event channels; taking into account both shared 194050ee6061SAndrew J. Bennieston * and split event channel scenarios. 194150ee6061SAndrew J. Bennieston */ 194250ee6061SAndrew J. Bennieston if (queue->tx_evtchn == queue->rx_evtchn) { 194350ee6061SAndrew J. Bennieston /* Shared event channel */ 194450ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 194550ee6061SAndrew J. Bennieston "event-channel", "%u", queue->tx_evtchn); 194650ee6061SAndrew J. Bennieston if (err) { 194750ee6061SAndrew J. Bennieston message = "writing event-channel"; 194850ee6061SAndrew J. Bennieston goto error; 194950ee6061SAndrew J. Bennieston } 195050ee6061SAndrew J. Bennieston } else { 195150ee6061SAndrew J. Bennieston /* Split event channels */ 195250ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 195350ee6061SAndrew J. Bennieston "event-channel-tx", "%u", queue->tx_evtchn); 195450ee6061SAndrew J. Bennieston if (err) { 195550ee6061SAndrew J. Bennieston message = "writing event-channel-tx"; 195650ee6061SAndrew J. Bennieston goto error; 195750ee6061SAndrew J. Bennieston } 195850ee6061SAndrew J. Bennieston 195950ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 196050ee6061SAndrew J. Bennieston "event-channel-rx", "%u", queue->rx_evtchn); 196150ee6061SAndrew J. Bennieston if (err) { 196250ee6061SAndrew J. Bennieston message = "writing event-channel-rx"; 196350ee6061SAndrew J. Bennieston goto error; 196450ee6061SAndrew J. Bennieston } 196550ee6061SAndrew J. Bennieston } 196650ee6061SAndrew J. Bennieston 196750ee6061SAndrew J. Bennieston if (write_hierarchical) 196850ee6061SAndrew J. Bennieston kfree(path); 196950ee6061SAndrew J. Bennieston return 0; 197050ee6061SAndrew J. Bennieston 197150ee6061SAndrew J. Bennieston error: 197250ee6061SAndrew J. Bennieston if (write_hierarchical) 197350ee6061SAndrew J. Bennieston kfree(path); 197450ee6061SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "%s", message); 197550ee6061SAndrew J. Bennieston return err; 197650ee6061SAndrew J. Bennieston } 197750ee6061SAndrew J. Bennieston 1978ce58725fSDavid Vrabel static void xennet_destroy_queues(struct netfront_info *info) 1979ce58725fSDavid Vrabel { 1980ce58725fSDavid Vrabel unsigned int i; 1981ce58725fSDavid Vrabel 1982ce58725fSDavid Vrabel for (i = 0; i < info->netdev->real_num_tx_queues; i++) { 1983ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 1984ce58725fSDavid Vrabel 1985ce58725fSDavid Vrabel if (netif_running(info->netdev)) 1986ce58725fSDavid Vrabel napi_disable(&queue->napi); 1987ce58725fSDavid Vrabel netif_napi_del(&queue->napi); 1988ce58725fSDavid Vrabel } 1989ce58725fSDavid Vrabel 1990ce58725fSDavid Vrabel kfree(info->queues); 1991ce58725fSDavid Vrabel info->queues = NULL; 1992ce58725fSDavid Vrabel } 1993ce58725fSDavid Vrabel 19946c5aa6fcSDenis Kirjanov 19956c5aa6fcSDenis Kirjanov 19966c5aa6fcSDenis Kirjanov static int xennet_create_page_pool(struct netfront_queue *queue) 19976c5aa6fcSDenis Kirjanov { 19986c5aa6fcSDenis Kirjanov int err; 19996c5aa6fcSDenis Kirjanov struct page_pool_params pp_params = { 20006c5aa6fcSDenis Kirjanov .order = 0, 20016c5aa6fcSDenis Kirjanov .flags = 0, 20026c5aa6fcSDenis Kirjanov .pool_size = NET_RX_RING_SIZE, 20036c5aa6fcSDenis Kirjanov .nid = NUMA_NO_NODE, 20046c5aa6fcSDenis Kirjanov .dev = &queue->info->netdev->dev, 20056c5aa6fcSDenis Kirjanov .offset = XDP_PACKET_HEADROOM, 20066c5aa6fcSDenis Kirjanov .max_len = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, 20076c5aa6fcSDenis Kirjanov }; 20086c5aa6fcSDenis Kirjanov 20096c5aa6fcSDenis Kirjanov queue->page_pool = page_pool_create(&pp_params); 20106c5aa6fcSDenis Kirjanov if (IS_ERR(queue->page_pool)) { 20116c5aa6fcSDenis Kirjanov err = PTR_ERR(queue->page_pool); 20126c5aa6fcSDenis Kirjanov queue->page_pool = NULL; 20136c5aa6fcSDenis Kirjanov return err; 20146c5aa6fcSDenis Kirjanov } 20156c5aa6fcSDenis Kirjanov 20166c5aa6fcSDenis Kirjanov err = xdp_rxq_info_reg(&queue->xdp_rxq, queue->info->netdev, 2017b02e5a0eSBjörn Töpel queue->id, 0); 20186c5aa6fcSDenis Kirjanov if (err) { 20196c5aa6fcSDenis Kirjanov netdev_err(queue->info->netdev, "xdp_rxq_info_reg failed\n"); 20206c5aa6fcSDenis Kirjanov goto err_free_pp; 20216c5aa6fcSDenis Kirjanov } 20226c5aa6fcSDenis Kirjanov 20236c5aa6fcSDenis Kirjanov err = xdp_rxq_info_reg_mem_model(&queue->xdp_rxq, 20246c5aa6fcSDenis Kirjanov MEM_TYPE_PAGE_POOL, queue->page_pool); 20256c5aa6fcSDenis Kirjanov if (err) { 20266c5aa6fcSDenis Kirjanov netdev_err(queue->info->netdev, "xdp_rxq_info_reg_mem_model failed\n"); 20276c5aa6fcSDenis Kirjanov goto err_unregister_rxq; 20286c5aa6fcSDenis Kirjanov } 20296c5aa6fcSDenis Kirjanov return 0; 20306c5aa6fcSDenis Kirjanov 20316c5aa6fcSDenis Kirjanov err_unregister_rxq: 20326c5aa6fcSDenis Kirjanov xdp_rxq_info_unreg(&queue->xdp_rxq); 20336c5aa6fcSDenis Kirjanov err_free_pp: 20346c5aa6fcSDenis Kirjanov page_pool_destroy(queue->page_pool); 20356c5aa6fcSDenis Kirjanov queue->page_pool = NULL; 20366c5aa6fcSDenis Kirjanov return err; 20376c5aa6fcSDenis Kirjanov } 20386c5aa6fcSDenis Kirjanov 2039ce58725fSDavid Vrabel static int xennet_create_queues(struct netfront_info *info, 2040ca88ea12SJoe Jin unsigned int *num_queues) 2041ce58725fSDavid Vrabel { 2042ce58725fSDavid Vrabel unsigned int i; 2043ce58725fSDavid Vrabel int ret; 2044ce58725fSDavid Vrabel 2045ca88ea12SJoe Jin info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), 2046ce58725fSDavid Vrabel GFP_KERNEL); 2047ce58725fSDavid Vrabel if (!info->queues) 2048ce58725fSDavid Vrabel return -ENOMEM; 2049ce58725fSDavid Vrabel 2050ca88ea12SJoe Jin for (i = 0; i < *num_queues; i++) { 2051ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 2052ce58725fSDavid Vrabel 2053ce58725fSDavid Vrabel queue->id = i; 2054ce58725fSDavid Vrabel queue->info = info; 2055ce58725fSDavid Vrabel 2056ce58725fSDavid Vrabel ret = xennet_init_queue(queue); 2057ce58725fSDavid Vrabel if (ret < 0) { 2058f599c64fSRoss Lagerwall dev_warn(&info->xbdev->dev, 205969cb8524SDavid Vrabel "only created %d queues\n", i); 2060ca88ea12SJoe Jin *num_queues = i; 2061ce58725fSDavid Vrabel break; 2062ce58725fSDavid Vrabel } 2063ce58725fSDavid Vrabel 20646c5aa6fcSDenis Kirjanov /* use page pool recycling instead of buddy allocator */ 20656c5aa6fcSDenis Kirjanov ret = xennet_create_page_pool(queue); 20666c5aa6fcSDenis Kirjanov if (ret < 0) { 20676c5aa6fcSDenis Kirjanov dev_err(&info->xbdev->dev, "can't allocate page pool\n"); 20686c5aa6fcSDenis Kirjanov *num_queues = i; 20696c5aa6fcSDenis Kirjanov return ret; 20706c5aa6fcSDenis Kirjanov } 20716c5aa6fcSDenis Kirjanov 2072ce58725fSDavid Vrabel netif_napi_add(queue->info->netdev, &queue->napi, 2073ce58725fSDavid Vrabel xennet_poll, 64); 2074ce58725fSDavid Vrabel if (netif_running(info->netdev)) 2075ce58725fSDavid Vrabel napi_enable(&queue->napi); 2076ce58725fSDavid Vrabel } 2077ce58725fSDavid Vrabel 2078ca88ea12SJoe Jin netif_set_real_num_tx_queues(info->netdev, *num_queues); 2079ce58725fSDavid Vrabel 2080ca88ea12SJoe Jin if (*num_queues == 0) { 2081f599c64fSRoss Lagerwall dev_err(&info->xbdev->dev, "no queues\n"); 2082ce58725fSDavid Vrabel return -EINVAL; 2083ce58725fSDavid Vrabel } 2084ce58725fSDavid Vrabel return 0; 2085ce58725fSDavid Vrabel } 2086ce58725fSDavid Vrabel 20870d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 2088f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 20890d160211SJeremy Fitzhardinge struct netfront_info *info) 20900d160211SJeremy Fitzhardinge { 20910d160211SJeremy Fitzhardinge const char *message; 20920d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 20930d160211SJeremy Fitzhardinge int err; 20942688fcb7SAndrew J. Bennieston unsigned int feature_split_evtchn; 20952688fcb7SAndrew J. Bennieston unsigned int i = 0; 209650ee6061SAndrew J. Bennieston unsigned int max_queues = 0; 20972688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 20982688fcb7SAndrew J. Bennieston unsigned int num_queues = 1; 20990d160211SJeremy Fitzhardinge 21002688fcb7SAndrew J. Bennieston info->netdev->irq = 0; 21012688fcb7SAndrew J. Bennieston 210250ee6061SAndrew J. Bennieston /* Check if backend supports multiple queues */ 21032890ea5cSJuergen Gross max_queues = xenbus_read_unsigned(info->xbdev->otherend, 21042890ea5cSJuergen Gross "multi-queue-max-queues", 1); 210550ee6061SAndrew J. Bennieston num_queues = min(max_queues, xennet_max_queues); 210650ee6061SAndrew J. Bennieston 21072688fcb7SAndrew J. Bennieston /* Check feature-split-event-channels */ 21082890ea5cSJuergen Gross feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, 21092890ea5cSJuergen Gross "feature-split-event-channels", 0); 21102688fcb7SAndrew J. Bennieston 21112688fcb7SAndrew J. Bennieston /* Read mac addr. */ 21122688fcb7SAndrew J. Bennieston err = xen_net_read_mac(dev, info->netdev->dev_addr); 21132688fcb7SAndrew J. Bennieston if (err) { 21142688fcb7SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 2115cb257783SRoss Lagerwall goto out_unlocked; 21162688fcb7SAndrew J. Bennieston } 21172688fcb7SAndrew J. Bennieston 21186c5aa6fcSDenis Kirjanov info->netback_has_xdp_headroom = xenbus_read_unsigned(info->xbdev->otherend, 21196c5aa6fcSDenis Kirjanov "feature-xdp-headroom", 0); 21206c5aa6fcSDenis Kirjanov if (info->netback_has_xdp_headroom) { 21216c5aa6fcSDenis Kirjanov /* set the current xen-netfront xdp state */ 21226c5aa6fcSDenis Kirjanov err = talk_to_netback_xdp(info, info->netfront_xdp_enabled ? 21236c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_ENABLE : 21246c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_DISABLE); 21256c5aa6fcSDenis Kirjanov if (err) 21266c5aa6fcSDenis Kirjanov goto out_unlocked; 21276c5aa6fcSDenis Kirjanov } 21286c5aa6fcSDenis Kirjanov 2129f599c64fSRoss Lagerwall rtnl_lock(); 2130ce58725fSDavid Vrabel if (info->queues) 2131ce58725fSDavid Vrabel xennet_destroy_queues(info); 2132ce58725fSDavid Vrabel 2133ca88ea12SJoe Jin err = xennet_create_queues(info, &num_queues); 2134e2e004acSRoss Lagerwall if (err < 0) { 2135e2e004acSRoss Lagerwall xenbus_dev_fatal(dev, err, "creating queues"); 2136e2e004acSRoss Lagerwall kfree(info->queues); 2137e2e004acSRoss Lagerwall info->queues = NULL; 2138e2e004acSRoss Lagerwall goto out; 2139e2e004acSRoss Lagerwall } 2140f599c64fSRoss Lagerwall rtnl_unlock(); 21412688fcb7SAndrew J. Bennieston 21422688fcb7SAndrew J. Bennieston /* Create shared ring, alloc event channel -- for each queue */ 21432688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 21442688fcb7SAndrew J. Bennieston queue = &info->queues[i]; 21452688fcb7SAndrew J. Bennieston err = setup_netfront(dev, queue, feature_split_evtchn); 2146e2e004acSRoss Lagerwall if (err) 21472688fcb7SAndrew J. Bennieston goto destroy_ring; 21482688fcb7SAndrew J. Bennieston } 21490d160211SJeremy Fitzhardinge 21500d160211SJeremy Fitzhardinge again: 21510d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 21520d160211SJeremy Fitzhardinge if (err) { 21530d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 21540d160211SJeremy Fitzhardinge goto destroy_ring; 21550d160211SJeremy Fitzhardinge } 21560d160211SJeremy Fitzhardinge 2157812494d9Schas williams if (xenbus_exists(XBT_NIL, 2158812494d9Schas williams info->xbdev->otherend, "multi-queue-max-queues")) { 2159812494d9Schas williams /* Write the number of queues */ 2160812494d9Schas williams err = xenbus_printf(xbt, dev->nodename, 2161812494d9Schas williams "multi-queue-num-queues", "%u", num_queues); 2162812494d9Schas williams if (err) { 2163812494d9Schas williams message = "writing multi-queue-num-queues"; 2164812494d9Schas williams goto abort_transaction_no_dev_fatal; 2165812494d9Schas williams } 2166812494d9Schas williams } 2167812494d9Schas williams 216850ee6061SAndrew J. Bennieston if (num_queues == 1) { 216950ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ 217050ee6061SAndrew J. Bennieston if (err) 217150ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 2172d634bf2cSWei Liu } else { 217350ee6061SAndrew J. Bennieston /* Write the keys for each queue */ 217450ee6061SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 217550ee6061SAndrew J. Bennieston queue = &info->queues[i]; 217650ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ 217750ee6061SAndrew J. Bennieston if (err) 217850ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 2179d634bf2cSWei Liu } 2180d634bf2cSWei Liu } 21810d160211SJeremy Fitzhardinge 218250ee6061SAndrew J. Bennieston /* The remaining keys are not queue-specific */ 21830d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 21840d160211SJeremy Fitzhardinge 1); 21850d160211SJeremy Fitzhardinge if (err) { 21860d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 21870d160211SJeremy Fitzhardinge goto abort_transaction; 21880d160211SJeremy Fitzhardinge } 21890d160211SJeremy Fitzhardinge 21900d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 21910d160211SJeremy Fitzhardinge if (err) { 21920d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 21930d160211SJeremy Fitzhardinge goto abort_transaction; 21940d160211SJeremy Fitzhardinge } 21950d160211SJeremy Fitzhardinge 21960d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 21970d160211SJeremy Fitzhardinge if (err) { 21980d160211SJeremy Fitzhardinge message = "writing feature-sg"; 21990d160211SJeremy Fitzhardinge goto abort_transaction; 22000d160211SJeremy Fitzhardinge } 22010d160211SJeremy Fitzhardinge 22020d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 22030d160211SJeremy Fitzhardinge if (err) { 22040d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 22050d160211SJeremy Fitzhardinge goto abort_transaction; 22060d160211SJeremy Fitzhardinge } 22070d160211SJeremy Fitzhardinge 22082c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); 22092c0057deSPaul Durrant if (err) { 22102c0057deSPaul Durrant message = "writing feature-gso-tcpv6"; 22112c0057deSPaul Durrant goto abort_transaction; 22122c0057deSPaul Durrant } 22132c0057deSPaul Durrant 22142c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", 22152c0057deSPaul Durrant "1"); 22162c0057deSPaul Durrant if (err) { 22172c0057deSPaul Durrant message = "writing feature-ipv6-csum-offload"; 22182c0057deSPaul Durrant goto abort_transaction; 22192c0057deSPaul Durrant } 22202c0057deSPaul Durrant 22210d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 22220d160211SJeremy Fitzhardinge if (err) { 22230d160211SJeremy Fitzhardinge if (err == -EAGAIN) 22240d160211SJeremy Fitzhardinge goto again; 22250d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 22260d160211SJeremy Fitzhardinge goto destroy_ring; 22270d160211SJeremy Fitzhardinge } 22280d160211SJeremy Fitzhardinge 22290d160211SJeremy Fitzhardinge return 0; 22300d160211SJeremy Fitzhardinge 22310d160211SJeremy Fitzhardinge abort_transaction: 22320d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 223350ee6061SAndrew J. Bennieston abort_transaction_no_dev_fatal: 223450ee6061SAndrew J. Bennieston xenbus_transaction_end(xbt, 1); 22350d160211SJeremy Fitzhardinge destroy_ring: 22360d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 2237f599c64fSRoss Lagerwall rtnl_lock(); 2238e2e004acSRoss Lagerwall xennet_destroy_queues(info); 22390d160211SJeremy Fitzhardinge out: 2240f599c64fSRoss Lagerwall rtnl_unlock(); 2241cb257783SRoss Lagerwall out_unlocked: 2242d86b5672SVitaly Kuznetsov device_unregister(&dev->dev); 22430d160211SJeremy Fitzhardinge return err; 22440d160211SJeremy Fitzhardinge } 22450d160211SJeremy Fitzhardinge 22460d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 22470d160211SJeremy Fitzhardinge { 22480d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 22492688fcb7SAndrew J. Bennieston unsigned int num_queues = 0; 2250a5b5dc3cSDavid Vrabel int err; 22512688fcb7SAndrew J. Bennieston unsigned int j = 0; 22522688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 22530d160211SJeremy Fitzhardinge 22542890ea5cSJuergen Gross if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { 22550d160211SJeremy Fitzhardinge dev_info(&dev->dev, 2256898eb71cSJoe Perches "backend does not support copying receive path\n"); 22570d160211SJeremy Fitzhardinge return -ENODEV; 22580d160211SJeremy Fitzhardinge } 22590d160211SJeremy Fitzhardinge 2260f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 22610d160211SJeremy Fitzhardinge if (err) 22620d160211SJeremy Fitzhardinge return err; 22636c5aa6fcSDenis Kirjanov if (np->netback_has_xdp_headroom) 22646c5aa6fcSDenis Kirjanov pr_info("backend supports XDP headroom\n"); 22650d160211SJeremy Fitzhardinge 22662688fcb7SAndrew J. Bennieston /* talk_to_netback() sets the correct number of queues */ 22672688fcb7SAndrew J. Bennieston num_queues = dev->real_num_tx_queues; 22682688fcb7SAndrew J. Bennieston 2269f599c64fSRoss Lagerwall if (dev->reg_state == NETREG_UNINITIALIZED) { 2270f599c64fSRoss Lagerwall err = register_netdev(dev); 2271f599c64fSRoss Lagerwall if (err) { 2272f599c64fSRoss Lagerwall pr_warn("%s: register_netdev err=%d\n", __func__, err); 2273f599c64fSRoss Lagerwall device_unregister(&np->xbdev->dev); 2274f599c64fSRoss Lagerwall return err; 2275f599c64fSRoss Lagerwall } 2276f599c64fSRoss Lagerwall } 2277f599c64fSRoss Lagerwall 227845c8184cSRoss Lagerwall rtnl_lock(); 227945c8184cSRoss Lagerwall netdev_update_features(dev); 228045c8184cSRoss Lagerwall rtnl_unlock(); 228145c8184cSRoss Lagerwall 22820d160211SJeremy Fitzhardinge /* 2283a5b5dc3cSDavid Vrabel * All public and private state should now be sane. Get 22840d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 22850d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 22860d160211SJeremy Fitzhardinge * packets. 22870d160211SJeremy Fitzhardinge */ 22880d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 22892688fcb7SAndrew J. Bennieston for (j = 0; j < num_queues; ++j) { 22902688fcb7SAndrew J. Bennieston queue = &np->queues[j]; 2291f50b4076SDavid Vrabel 22922688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 22932688fcb7SAndrew J. Bennieston if (queue->tx_irq != queue->rx_irq) 22942688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 22950d160211SJeremy Fitzhardinge 2296f50b4076SDavid Vrabel spin_lock_irq(&queue->tx_lock); 2297f50b4076SDavid Vrabel xennet_tx_buf_gc(queue); 22982688fcb7SAndrew J. Bennieston spin_unlock_irq(&queue->tx_lock); 2299f50b4076SDavid Vrabel 2300f50b4076SDavid Vrabel spin_lock_bh(&queue->rx_lock); 2301f50b4076SDavid Vrabel xennet_alloc_rx_buffers(queue); 23022688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 23032688fcb7SAndrew J. Bennieston } 23040d160211SJeremy Fitzhardinge 23050d160211SJeremy Fitzhardinge return 0; 23060d160211SJeremy Fitzhardinge } 23070d160211SJeremy Fitzhardinge 23080d160211SJeremy Fitzhardinge /** 23090d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 23100d160211SJeremy Fitzhardinge */ 2311f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 23120d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 23130d160211SJeremy Fitzhardinge { 23141b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 23150d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 23160d160211SJeremy Fitzhardinge 23170d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 23180d160211SJeremy Fitzhardinge 23198edfe2e9SJuergen Gross wake_up_all(&module_wq); 23208edfe2e9SJuergen Gross 23210d160211SJeremy Fitzhardinge switch (backend_state) { 23220d160211SJeremy Fitzhardinge case XenbusStateInitialising: 23230d160211SJeremy Fitzhardinge case XenbusStateInitialised: 2324b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 2325b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 23260d160211SJeremy Fitzhardinge case XenbusStateUnknown: 23270d160211SJeremy Fitzhardinge break; 23280d160211SJeremy Fitzhardinge 23290d160211SJeremy Fitzhardinge case XenbusStateInitWait: 23300d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 23310d160211SJeremy Fitzhardinge break; 23320d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 23330d160211SJeremy Fitzhardinge break; 23340d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 233508e34eb1SLaszlo Ersek break; 233608e34eb1SLaszlo Ersek 233708e34eb1SLaszlo Ersek case XenbusStateConnected: 2338ee89bab1SAmerigo Wang netdev_notify_peers(netdev); 23390d160211SJeremy Fitzhardinge break; 23400d160211SJeremy Fitzhardinge 2341bce3ea81SDavid Vrabel case XenbusStateClosed: 2342bce3ea81SDavid Vrabel if (dev->state == XenbusStateClosed) 2343bce3ea81SDavid Vrabel break; 2344df561f66SGustavo A. R. Silva fallthrough; /* Missed the backend's CLOSING state */ 23450d160211SJeremy Fitzhardinge case XenbusStateClosing: 23460d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 23470d160211SJeremy Fitzhardinge break; 23480d160211SJeremy Fitzhardinge } 23490d160211SJeremy Fitzhardinge } 23500d160211SJeremy Fitzhardinge 2351e0ce4af9SIan Campbell static const struct xennet_stat { 2352e0ce4af9SIan Campbell char name[ETH_GSTRING_LEN]; 2353e0ce4af9SIan Campbell u16 offset; 2354e0ce4af9SIan Campbell } xennet_stats[] = { 2355e0ce4af9SIan Campbell { 2356e0ce4af9SIan Campbell "rx_gso_checksum_fixup", 2357e0ce4af9SIan Campbell offsetof(struct netfront_info, rx_gso_checksum_fixup) 2358e0ce4af9SIan Campbell }, 2359e0ce4af9SIan Campbell }; 2360e0ce4af9SIan Campbell 2361e0ce4af9SIan Campbell static int xennet_get_sset_count(struct net_device *dev, int string_set) 2362e0ce4af9SIan Campbell { 2363e0ce4af9SIan Campbell switch (string_set) { 2364e0ce4af9SIan Campbell case ETH_SS_STATS: 2365e0ce4af9SIan Campbell return ARRAY_SIZE(xennet_stats); 2366e0ce4af9SIan Campbell default: 2367e0ce4af9SIan Campbell return -EINVAL; 2368e0ce4af9SIan Campbell } 2369e0ce4af9SIan Campbell } 2370e0ce4af9SIan Campbell 2371e0ce4af9SIan Campbell static void xennet_get_ethtool_stats(struct net_device *dev, 2372e0ce4af9SIan Campbell struct ethtool_stats *stats, u64 * data) 2373e0ce4af9SIan Campbell { 2374e0ce4af9SIan Campbell void *np = netdev_priv(dev); 2375e0ce4af9SIan Campbell int i; 2376e0ce4af9SIan Campbell 2377e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 23782688fcb7SAndrew J. Bennieston data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); 2379e0ce4af9SIan Campbell } 2380e0ce4af9SIan Campbell 2381e0ce4af9SIan Campbell static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) 2382e0ce4af9SIan Campbell { 2383e0ce4af9SIan Campbell int i; 2384e0ce4af9SIan Campbell 2385e0ce4af9SIan Campbell switch (stringset) { 2386e0ce4af9SIan Campbell case ETH_SS_STATS: 2387e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 2388e0ce4af9SIan Campbell memcpy(data + i * ETH_GSTRING_LEN, 2389e0ce4af9SIan Campbell xennet_stats[i].name, ETH_GSTRING_LEN); 2390e0ce4af9SIan Campbell break; 2391e0ce4af9SIan Campbell } 2392e0ce4af9SIan Campbell } 2393e0ce4af9SIan Campbell 23940fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 23950d160211SJeremy Fitzhardinge { 23960d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 2397e0ce4af9SIan Campbell 2398e0ce4af9SIan Campbell .get_sset_count = xennet_get_sset_count, 2399e0ce4af9SIan Campbell .get_ethtool_stats = xennet_get_ethtool_stats, 2400e0ce4af9SIan Campbell .get_strings = xennet_get_strings, 240191ffb9d3SDaniel Drown .get_ts_info = ethtool_op_get_ts_info, 24020d160211SJeremy Fitzhardinge }; 24030d160211SJeremy Fitzhardinge 24040d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 24051f3c2ebaSDavid Vrabel static ssize_t show_rxbuf(struct device *dev, 24060d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 24070d160211SJeremy Fitzhardinge { 24081f3c2ebaSDavid Vrabel return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); 24090d160211SJeremy Fitzhardinge } 24100d160211SJeremy Fitzhardinge 24111f3c2ebaSDavid Vrabel static ssize_t store_rxbuf(struct device *dev, 24120d160211SJeremy Fitzhardinge struct device_attribute *attr, 24130d160211SJeremy Fitzhardinge const char *buf, size_t len) 24140d160211SJeremy Fitzhardinge { 24150d160211SJeremy Fitzhardinge char *endp; 24160d160211SJeremy Fitzhardinge 24170d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 24180d160211SJeremy Fitzhardinge return -EPERM; 24190d160211SJeremy Fitzhardinge 24208ed7ec13SAndrew Lunn simple_strtoul(buf, &endp, 0); 24210d160211SJeremy Fitzhardinge if (endp == buf) 24220d160211SJeremy Fitzhardinge return -EBADMSG; 24230d160211SJeremy Fitzhardinge 24241f3c2ebaSDavid Vrabel /* rxbuf_min and rxbuf_max are no longer configurable. */ 24250d160211SJeremy Fitzhardinge 24260d160211SJeremy Fitzhardinge return len; 24270d160211SJeremy Fitzhardinge } 24280d160211SJeremy Fitzhardinge 2429d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf); 2430d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf); 2431d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL); 243227b917e5STakashi Iwai 243327b917e5STakashi Iwai static struct attribute *xennet_dev_attrs[] = { 243427b917e5STakashi Iwai &dev_attr_rxbuf_min.attr, 243527b917e5STakashi Iwai &dev_attr_rxbuf_max.attr, 243627b917e5STakashi Iwai &dev_attr_rxbuf_cur.attr, 243727b917e5STakashi Iwai NULL 24380d160211SJeremy Fitzhardinge }; 24390d160211SJeremy Fitzhardinge 244027b917e5STakashi Iwai static const struct attribute_group xennet_dev_group = { 244127b917e5STakashi Iwai .attrs = xennet_dev_attrs 244227b917e5STakashi Iwai }; 24430d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 24440d160211SJeremy Fitzhardinge 2445c2c63310SAndrea Righi static void xennet_bus_close(struct xenbus_device *dev) 2446c2c63310SAndrea Righi { 2447c2c63310SAndrea Righi int ret; 2448c2c63310SAndrea Righi 2449c2c63310SAndrea Righi if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) 2450c2c63310SAndrea Righi return; 2451c2c63310SAndrea Righi do { 2452c2c63310SAndrea Righi xenbus_switch_state(dev, XenbusStateClosing); 2453c2c63310SAndrea Righi ret = wait_event_timeout(module_wq, 2454c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2455c2c63310SAndrea Righi XenbusStateClosing || 2456c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2457c2c63310SAndrea Righi XenbusStateClosed || 2458c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2459c2c63310SAndrea Righi XenbusStateUnknown, 2460c2c63310SAndrea Righi XENNET_TIMEOUT); 2461c2c63310SAndrea Righi } while (!ret); 2462c2c63310SAndrea Righi 2463c2c63310SAndrea Righi if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) 2464c2c63310SAndrea Righi return; 2465c2c63310SAndrea Righi 2466c2c63310SAndrea Righi do { 2467c2c63310SAndrea Righi xenbus_switch_state(dev, XenbusStateClosed); 2468c2c63310SAndrea Righi ret = wait_event_timeout(module_wq, 2469c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2470c2c63310SAndrea Righi XenbusStateClosed || 2471c2c63310SAndrea Righi xenbus_read_driver_state(dev->otherend) == 2472c2c63310SAndrea Righi XenbusStateUnknown, 2473c2c63310SAndrea Righi XENNET_TIMEOUT); 2474c2c63310SAndrea Righi } while (!ret); 2475c2c63310SAndrea Righi } 2476c2c63310SAndrea Righi 24778e0e46bbSBill Pemberton static int xennet_remove(struct xenbus_device *dev) 24780d160211SJeremy Fitzhardinge { 24791b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 24800d160211SJeremy Fitzhardinge 2481c2c63310SAndrea Righi xennet_bus_close(dev); 24820d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 24830d160211SJeremy Fitzhardinge 2484f599c64fSRoss Lagerwall if (info->netdev->reg_state == NETREG_REGISTERED) 24856bc96d04SIan Campbell unregister_netdev(info->netdev); 24866bc96d04SIan Campbell 2487f599c64fSRoss Lagerwall if (info->queues) { 2488f599c64fSRoss Lagerwall rtnl_lock(); 2489ad068118SDavid Vrabel xennet_destroy_queues(info); 2490f599c64fSRoss Lagerwall rtnl_unlock(); 2491f599c64fSRoss Lagerwall } 2492900e1833SDavid Vrabel xennet_free_netdev(info->netdev); 24930d160211SJeremy Fitzhardinge 24940d160211SJeremy Fitzhardinge return 0; 24950d160211SJeremy Fitzhardinge } 24960d160211SJeremy Fitzhardinge 249795afae48SDavid Vrabel static const struct xenbus_device_id netfront_ids[] = { 249895afae48SDavid Vrabel { "vif" }, 249995afae48SDavid Vrabel { "" } 250095afae48SDavid Vrabel }; 250195afae48SDavid Vrabel 250295afae48SDavid Vrabel static struct xenbus_driver netfront_driver = { 250395afae48SDavid Vrabel .ids = netfront_ids, 25040d160211SJeremy Fitzhardinge .probe = netfront_probe, 25058e0e46bbSBill Pemberton .remove = xennet_remove, 25060d160211SJeremy Fitzhardinge .resume = netfront_resume, 2507f502bf2bSIan Campbell .otherend_changed = netback_changed, 250895afae48SDavid Vrabel }; 25090d160211SJeremy Fitzhardinge 25100d160211SJeremy Fitzhardinge static int __init netif_init(void) 25110d160211SJeremy Fitzhardinge { 25126e833587SJeremy Fitzhardinge if (!xen_domain()) 25130d160211SJeremy Fitzhardinge return -ENODEV; 25140d160211SJeremy Fitzhardinge 251551c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_nic_devices()) 2516b9136d20SIgor Mammedov return -ENODEV; 2517b9136d20SIgor Mammedov 2518383eda32SJoe Perches pr_info("Initialising Xen virtual ethernet driver\n"); 25190d160211SJeremy Fitzhardinge 2520034702a6SJuergen Gross /* Allow as many queues as there are CPUs inut max. 8 if user has not 252132a84405SWei Liu * specified a value. 252232a84405SWei Liu */ 252332a84405SWei Liu if (xennet_max_queues == 0) 2524034702a6SJuergen Gross xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, 2525034702a6SJuergen Gross num_online_cpus()); 252650ee6061SAndrew J. Bennieston 2527ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 25280d160211SJeremy Fitzhardinge } 25290d160211SJeremy Fitzhardinge module_init(netif_init); 25300d160211SJeremy Fitzhardinge 25310d160211SJeremy Fitzhardinge 25320d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 25330d160211SJeremy Fitzhardinge { 2534ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 25350d160211SJeremy Fitzhardinge } 25360d160211SJeremy Fitzhardinge module_exit(netif_exit); 25370d160211SJeremy Fitzhardinge 25380d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 25390d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 2540d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 25414f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 2542