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 690fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 700d160211SJeremy Fitzhardinge 710d160211SJeremy Fitzhardinge struct netfront_cb { 723683243bSIan Campbell int pull_to; 730d160211SJeremy Fitzhardinge }; 740d160211SJeremy Fitzhardinge 750d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 760d160211SJeremy Fitzhardinge 770d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 780d160211SJeremy Fitzhardinge 790d160211SJeremy Fitzhardinge #define GRANT_INVALID_REF 0 800d160211SJeremy Fitzhardinge 8130c5d7f0SJulien Grall #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) 8230c5d7f0SJulien Grall #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) 831f3c2ebaSDavid Vrabel 841f3c2ebaSDavid Vrabel /* Minimum number of Rx slots (includes slot for GSO metadata). */ 851f3c2ebaSDavid Vrabel #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) 860d160211SJeremy Fitzhardinge 872688fcb7SAndrew J. Bennieston /* Queue name is interface name with "-qNNN" appended */ 882688fcb7SAndrew J. Bennieston #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) 892688fcb7SAndrew J. Bennieston 902688fcb7SAndrew J. Bennieston /* IRQ name is queue name with "-tx" or "-rx" appended */ 912688fcb7SAndrew J. Bennieston #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) 922688fcb7SAndrew J. Bennieston 938edfe2e9SJuergen Gross static DECLARE_WAIT_QUEUE_HEAD(module_wq); 945b5971dfSEduardo Otubo 95e00f85beSstephen hemminger struct netfront_stats { 96900e1833SDavid Vrabel u64 packets; 97900e1833SDavid Vrabel u64 bytes; 98e00f85beSstephen hemminger struct u64_stats_sync syncp; 99e00f85beSstephen hemminger }; 100e00f85beSstephen hemminger 1012688fcb7SAndrew J. Bennieston struct netfront_info; 1022688fcb7SAndrew J. Bennieston 1032688fcb7SAndrew J. Bennieston struct netfront_queue { 1042688fcb7SAndrew J. Bennieston unsigned int id; /* Queue ID, 0-based */ 1052688fcb7SAndrew J. Bennieston char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ 1062688fcb7SAndrew J. Bennieston struct netfront_info *info; 1070d160211SJeremy Fitzhardinge 1086c5aa6fcSDenis Kirjanov struct bpf_prog __rcu *xdp_prog; 1096c5aa6fcSDenis Kirjanov 110bea3348eSStephen Hemminger struct napi_struct napi; 1110d160211SJeremy Fitzhardinge 112d634bf2cSWei Liu /* Split event channels support, tx_* == rx_* when using 113d634bf2cSWei Liu * single event channel. 114d634bf2cSWei Liu */ 115d634bf2cSWei Liu unsigned int tx_evtchn, rx_evtchn; 116d634bf2cSWei Liu unsigned int tx_irq, rx_irq; 117d634bf2cSWei Liu /* Only used when split event channels support is enabled */ 1182688fcb7SAndrew J. Bennieston char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ 1192688fcb7SAndrew J. Bennieston char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ 1200d160211SJeremy Fitzhardinge 1210d160211SJeremy Fitzhardinge spinlock_t tx_lock; 12284284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 12384284d3cSJeremy Fitzhardinge int tx_ring_ref; 1240d160211SJeremy Fitzhardinge 1250d160211SJeremy Fitzhardinge /* 1260d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 1270d160211SJeremy Fitzhardinge * are linked from tx_skb_freelist through skb_entry.link. 1280d160211SJeremy Fitzhardinge * 1290d160211SJeremy Fitzhardinge * NB. Freelist index entries are always going to be less than 1300d160211SJeremy Fitzhardinge * PAGE_OFFSET, whereas pointers to skbs will always be equal or 1310d160211SJeremy Fitzhardinge * greater than PAGE_OFFSET: we use this property to distinguish 1320d160211SJeremy Fitzhardinge * them. 1330d160211SJeremy Fitzhardinge */ 1340d160211SJeremy Fitzhardinge union skb_entry { 1350d160211SJeremy Fitzhardinge struct sk_buff *skb; 1361ffb40b8SIsaku Yamahata unsigned long link; 1370d160211SJeremy Fitzhardinge } tx_skbs[NET_TX_RING_SIZE]; 1380d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1390d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 140cefe0078SAnnie Li struct page *grant_tx_page[NET_TX_RING_SIZE]; 1410d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 1420d160211SJeremy Fitzhardinge 14384284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 14484284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 14584284d3cSJeremy Fitzhardinge int rx_ring_ref; 14684284d3cSJeremy Fitzhardinge 14784284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 14884284d3cSJeremy Fitzhardinge 1490d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1500d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1510d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1526c5aa6fcSDenis Kirjanov 1536c5aa6fcSDenis Kirjanov struct page_pool *page_pool; 1546c5aa6fcSDenis Kirjanov struct xdp_rxq_info xdp_rxq; 1552688fcb7SAndrew J. Bennieston }; 1562688fcb7SAndrew J. Bennieston 1572688fcb7SAndrew J. Bennieston struct netfront_info { 1582688fcb7SAndrew J. Bennieston struct list_head list; 1592688fcb7SAndrew J. Bennieston struct net_device *netdev; 1602688fcb7SAndrew J. Bennieston 1612688fcb7SAndrew J. Bennieston struct xenbus_device *xbdev; 1622688fcb7SAndrew J. Bennieston 1632688fcb7SAndrew J. Bennieston /* Multi-queue support */ 1642688fcb7SAndrew J. Bennieston struct netfront_queue *queues; 165e0ce4af9SIan Campbell 166e0ce4af9SIan Campbell /* Statistics */ 167900e1833SDavid Vrabel struct netfront_stats __percpu *rx_stats; 168900e1833SDavid Vrabel struct netfront_stats __percpu *tx_stats; 169e00f85beSstephen hemminger 1706c5aa6fcSDenis Kirjanov /* XDP state */ 1716c5aa6fcSDenis Kirjanov bool netback_has_xdp_headroom; 1726c5aa6fcSDenis Kirjanov bool netfront_xdp_enabled; 1736c5aa6fcSDenis Kirjanov 1742688fcb7SAndrew J. Bennieston atomic_t rx_gso_checksum_fixup; 1750d160211SJeremy Fitzhardinge }; 1760d160211SJeremy Fitzhardinge 1770d160211SJeremy Fitzhardinge struct netfront_rx_info { 1780d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1790d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1800d160211SJeremy Fitzhardinge }; 1810d160211SJeremy Fitzhardinge 1821ffb40b8SIsaku Yamahata static void skb_entry_set_link(union skb_entry *list, unsigned short id) 1831ffb40b8SIsaku Yamahata { 1841ffb40b8SIsaku Yamahata list->link = id; 1851ffb40b8SIsaku Yamahata } 1861ffb40b8SIsaku Yamahata 1871ffb40b8SIsaku Yamahata static int skb_entry_is_link(const union skb_entry *list) 1881ffb40b8SIsaku Yamahata { 1891ffb40b8SIsaku Yamahata BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); 190807540baSEric Dumazet return (unsigned long)list->skb < PAGE_OFFSET; 1911ffb40b8SIsaku Yamahata } 1921ffb40b8SIsaku Yamahata 1930d160211SJeremy Fitzhardinge /* 1940d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1950d160211SJeremy Fitzhardinge */ 1960d160211SJeremy Fitzhardinge 1970d160211SJeremy Fitzhardinge static void add_id_to_freelist(unsigned *head, union skb_entry *list, 1980d160211SJeremy Fitzhardinge unsigned short id) 1990d160211SJeremy Fitzhardinge { 2001ffb40b8SIsaku Yamahata skb_entry_set_link(&list[id], *head); 2010d160211SJeremy Fitzhardinge *head = id; 2020d160211SJeremy Fitzhardinge } 2030d160211SJeremy Fitzhardinge 2040d160211SJeremy Fitzhardinge static unsigned short get_id_from_freelist(unsigned *head, 2050d160211SJeremy Fitzhardinge union skb_entry *list) 2060d160211SJeremy Fitzhardinge { 2070d160211SJeremy Fitzhardinge unsigned int id = *head; 2080d160211SJeremy Fitzhardinge *head = list[id].link; 2090d160211SJeremy Fitzhardinge return id; 2100d160211SJeremy Fitzhardinge } 2110d160211SJeremy Fitzhardinge 2120d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 2130d160211SJeremy Fitzhardinge { 2140d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 2150d160211SJeremy Fitzhardinge } 2160d160211SJeremy Fitzhardinge 2172688fcb7SAndrew J. Bennieston static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, 2180d160211SJeremy Fitzhardinge RING_IDX ri) 2190d160211SJeremy Fitzhardinge { 2200d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2212688fcb7SAndrew J. Bennieston struct sk_buff *skb = queue->rx_skbs[i]; 2222688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 2230d160211SJeremy Fitzhardinge return skb; 2240d160211SJeremy Fitzhardinge } 2250d160211SJeremy Fitzhardinge 2262688fcb7SAndrew J. Bennieston static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, 2270d160211SJeremy Fitzhardinge RING_IDX ri) 2280d160211SJeremy Fitzhardinge { 2290d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2302688fcb7SAndrew J. Bennieston grant_ref_t ref = queue->grant_rx_ref[i]; 2312688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 2320d160211SJeremy Fitzhardinge return ref; 2330d160211SJeremy Fitzhardinge } 2340d160211SJeremy Fitzhardinge 2350d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 23627b917e5STakashi Iwai static const struct attribute_group xennet_dev_group; 2370d160211SJeremy Fitzhardinge #endif 2380d160211SJeremy Fitzhardinge 2393ad9b358SMichał Mirosław static bool xennet_can_sg(struct net_device *dev) 2400d160211SJeremy Fitzhardinge { 2413ad9b358SMichał Mirosław return dev->features & NETIF_F_SG; 2420d160211SJeremy Fitzhardinge } 2430d160211SJeremy Fitzhardinge 2440d160211SJeremy Fitzhardinge 245e99e88a9SKees Cook static void rx_refill_timeout(struct timer_list *t) 2460d160211SJeremy Fitzhardinge { 247e99e88a9SKees Cook struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer); 2482688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 2490d160211SJeremy Fitzhardinge } 2500d160211SJeremy Fitzhardinge 2512688fcb7SAndrew J. Bennieston static int netfront_tx_slot_available(struct netfront_queue *queue) 2520d160211SJeremy Fitzhardinge { 2532688fcb7SAndrew J. Bennieston return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < 25457f230abSJuergen Gross (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); 2550d160211SJeremy Fitzhardinge } 2560d160211SJeremy Fitzhardinge 2572688fcb7SAndrew J. Bennieston static void xennet_maybe_wake_tx(struct netfront_queue *queue) 2580d160211SJeremy Fitzhardinge { 2592688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 2602688fcb7SAndrew J. Bennieston struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); 2610d160211SJeremy Fitzhardinge 2622688fcb7SAndrew J. Bennieston if (unlikely(netif_tx_queue_stopped(dev_queue)) && 2632688fcb7SAndrew J. Bennieston netfront_tx_slot_available(queue) && 2640d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2652688fcb7SAndrew J. Bennieston netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); 2660d160211SJeremy Fitzhardinge } 2670d160211SJeremy Fitzhardinge 2681f3c2ebaSDavid Vrabel 2691f3c2ebaSDavid Vrabel static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) 2700d160211SJeremy Fitzhardinge { 2710d160211SJeremy Fitzhardinge struct sk_buff *skb; 2720d160211SJeremy Fitzhardinge struct page *page; 2730d160211SJeremy Fitzhardinge 2742688fcb7SAndrew J. Bennieston skb = __netdev_alloc_skb(queue->info->netdev, 2752688fcb7SAndrew J. Bennieston RX_COPY_THRESHOLD + NET_IP_ALIGN, 2760d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2770d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2781f3c2ebaSDavid Vrabel return NULL; 279617a20bbSIsaku Yamahata 2806c5aa6fcSDenis Kirjanov page = page_pool_dev_alloc_pages(queue->page_pool); 2816c5aa6fcSDenis Kirjanov if (unlikely(!page)) { 2820d160211SJeremy Fitzhardinge kfree_skb(skb); 2831f3c2ebaSDavid Vrabel return NULL; 2840d160211SJeremy Fitzhardinge } 285093b9c71SJan Beulich skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); 2860d160211SJeremy Fitzhardinge 2871f3c2ebaSDavid Vrabel /* Align ip header to a 16 bytes boundary */ 2881f3c2ebaSDavid Vrabel skb_reserve(skb, NET_IP_ALIGN); 2892688fcb7SAndrew J. Bennieston skb->dev = queue->info->netdev; 2900d160211SJeremy Fitzhardinge 2911f3c2ebaSDavid Vrabel return skb; 2921f3c2ebaSDavid Vrabel } 2931f3c2ebaSDavid Vrabel 2941f3c2ebaSDavid Vrabel 2951f3c2ebaSDavid Vrabel static void xennet_alloc_rx_buffers(struct netfront_queue *queue) 2961f3c2ebaSDavid Vrabel { 2971f3c2ebaSDavid Vrabel RING_IDX req_prod = queue->rx.req_prod_pvt; 2981f3c2ebaSDavid Vrabel int notify; 299538d9291SVineeth Remanan Pillai int err = 0; 3001f3c2ebaSDavid Vrabel 3011f3c2ebaSDavid Vrabel if (unlikely(!netif_carrier_ok(queue->info->netdev))) 3021f3c2ebaSDavid Vrabel return; 3031f3c2ebaSDavid Vrabel 3041f3c2ebaSDavid Vrabel for (req_prod = queue->rx.req_prod_pvt; 3051f3c2ebaSDavid Vrabel req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; 3061f3c2ebaSDavid Vrabel req_prod++) { 3071f3c2ebaSDavid Vrabel struct sk_buff *skb; 3081f3c2ebaSDavid Vrabel unsigned short id; 3091f3c2ebaSDavid Vrabel grant_ref_t ref; 31030c5d7f0SJulien Grall struct page *page; 3111f3c2ebaSDavid Vrabel struct xen_netif_rx_request *req; 3121f3c2ebaSDavid Vrabel 3131f3c2ebaSDavid Vrabel skb = xennet_alloc_one_rx_buffer(queue); 314538d9291SVineeth Remanan Pillai if (!skb) { 315538d9291SVineeth Remanan Pillai err = -ENOMEM; 3161f3c2ebaSDavid Vrabel break; 317538d9291SVineeth Remanan Pillai } 3181f3c2ebaSDavid Vrabel 3191f3c2ebaSDavid Vrabel id = xennet_rxidx(req_prod); 3200d160211SJeremy Fitzhardinge 3212688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[id]); 3222688fcb7SAndrew J. Bennieston queue->rx_skbs[id] = skb; 3230d160211SJeremy Fitzhardinge 3242688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_rx_head); 325269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 3262688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = ref; 3270d160211SJeremy Fitzhardinge 32830c5d7f0SJulien Grall page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 3290d160211SJeremy Fitzhardinge 3301f3c2ebaSDavid Vrabel req = RING_GET_REQUEST(&queue->rx, req_prod); 33130c5d7f0SJulien Grall gnttab_page_grant_foreign_access_ref_one(ref, 3322688fcb7SAndrew J. Bennieston queue->info->xbdev->otherend_id, 33330c5d7f0SJulien Grall page, 3340d160211SJeremy Fitzhardinge 0); 3350d160211SJeremy Fitzhardinge req->id = id; 3360d160211SJeremy Fitzhardinge req->gref = ref; 3370d160211SJeremy Fitzhardinge } 3380d160211SJeremy Fitzhardinge 3391f3c2ebaSDavid Vrabel queue->rx.req_prod_pvt = req_prod; 3401f3c2ebaSDavid Vrabel 341538d9291SVineeth Remanan Pillai /* Try again later if there are not enough requests or skb allocation 342538d9291SVineeth Remanan Pillai * failed. 343538d9291SVineeth Remanan Pillai * Enough requests is quantified as the sum of newly created slots and 344538d9291SVineeth Remanan Pillai * the unconsumed slots at the backend. 345538d9291SVineeth Remanan Pillai */ 346538d9291SVineeth Remanan Pillai if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || 347538d9291SVineeth Remanan Pillai unlikely(err)) { 3481f3c2ebaSDavid Vrabel mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); 3491f3c2ebaSDavid Vrabel return; 3501f3c2ebaSDavid Vrabel } 3511f3c2ebaSDavid Vrabel 3522688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); 3530d160211SJeremy Fitzhardinge if (notify) 3542688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 3550d160211SJeremy Fitzhardinge } 3560d160211SJeremy Fitzhardinge 3570d160211SJeremy Fitzhardinge static int xennet_open(struct net_device *dev) 3580d160211SJeremy Fitzhardinge { 3590d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3602688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 3612688fcb7SAndrew J. Bennieston unsigned int i = 0; 3622688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 3630d160211SJeremy Fitzhardinge 364f599c64fSRoss Lagerwall if (!np->queues) 365f599c64fSRoss Lagerwall return -ENODEV; 366f599c64fSRoss Lagerwall 3672688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 3682688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 3692688fcb7SAndrew J. Bennieston napi_enable(&queue->napi); 370bea3348eSStephen Hemminger 3712688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 3720d160211SJeremy Fitzhardinge if (netif_carrier_ok(dev)) { 3732688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 3742688fcb7SAndrew J. Bennieston queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; 3752688fcb7SAndrew J. Bennieston if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) 3762688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 3770d160211SJeremy Fitzhardinge } 3782688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 3792688fcb7SAndrew J. Bennieston } 3800d160211SJeremy Fitzhardinge 3812688fcb7SAndrew J. Bennieston netif_tx_start_all_queues(dev); 3820d160211SJeremy Fitzhardinge 3830d160211SJeremy Fitzhardinge return 0; 3840d160211SJeremy Fitzhardinge } 3850d160211SJeremy Fitzhardinge 3862688fcb7SAndrew J. Bennieston static void xennet_tx_buf_gc(struct netfront_queue *queue) 3870d160211SJeremy Fitzhardinge { 3880d160211SJeremy Fitzhardinge RING_IDX cons, prod; 3890d160211SJeremy Fitzhardinge unsigned short id; 3900d160211SJeremy Fitzhardinge struct sk_buff *skb; 3917d0105b5SMalcolm Crossley bool more_to_do; 3920d160211SJeremy Fitzhardinge 3932688fcb7SAndrew J. Bennieston BUG_ON(!netif_carrier_ok(queue->info->netdev)); 3940d160211SJeremy Fitzhardinge 3950d160211SJeremy Fitzhardinge do { 3962688fcb7SAndrew J. Bennieston prod = queue->tx.sring->rsp_prod; 3970d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 3980d160211SJeremy Fitzhardinge 3992688fcb7SAndrew J. Bennieston for (cons = queue->tx.rsp_cons; cons != prod; cons++) { 4000d160211SJeremy Fitzhardinge struct xen_netif_tx_response *txrsp; 4010d160211SJeremy Fitzhardinge 4022688fcb7SAndrew J. Bennieston txrsp = RING_GET_RESPONSE(&queue->tx, cons); 403f942dc25SIan Campbell if (txrsp->status == XEN_NETIF_RSP_NULL) 4040d160211SJeremy Fitzhardinge continue; 4050d160211SJeremy Fitzhardinge 4060d160211SJeremy Fitzhardinge id = txrsp->id; 4072688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[id].skb; 4080d160211SJeremy Fitzhardinge if (unlikely(gnttab_query_foreign_access( 4092688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id]) != 0)) { 410383eda32SJoe Perches pr_alert("%s: warning -- grant still in use by backend domain\n", 411383eda32SJoe Perches __func__); 4120d160211SJeremy Fitzhardinge BUG(); 4130d160211SJeremy Fitzhardinge } 4140d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref( 4152688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id], GNTMAP_readonly); 4160d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 4172688fcb7SAndrew J. Bennieston &queue->gref_tx_head, queue->grant_tx_ref[id]); 4182688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id] = GRANT_INVALID_REF; 4192688fcb7SAndrew J. Bennieston queue->grant_tx_page[id] = NULL; 4202688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id); 4210d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 4220d160211SJeremy Fitzhardinge } 4230d160211SJeremy Fitzhardinge 4242688fcb7SAndrew J. Bennieston queue->tx.rsp_cons = prod; 4250d160211SJeremy Fitzhardinge 4267d0105b5SMalcolm Crossley RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); 4277d0105b5SMalcolm Crossley } while (more_to_do); 4280d160211SJeremy Fitzhardinge 4292688fcb7SAndrew J. Bennieston xennet_maybe_wake_tx(queue); 4300d160211SJeremy Fitzhardinge } 4310d160211SJeremy Fitzhardinge 43230c5d7f0SJulien Grall struct xennet_gnttab_make_txreq { 43330c5d7f0SJulien Grall struct netfront_queue *queue; 43430c5d7f0SJulien Grall struct sk_buff *skb; 43530c5d7f0SJulien Grall struct page *page; 43630c5d7f0SJulien Grall struct xen_netif_tx_request *tx; /* Last request */ 43730c5d7f0SJulien Grall unsigned int size; 43830c5d7f0SJulien Grall }; 43930c5d7f0SJulien Grall 44030c5d7f0SJulien Grall static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, 44130c5d7f0SJulien Grall unsigned int len, void *data) 4420d160211SJeremy Fitzhardinge { 44330c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 4440d160211SJeremy Fitzhardinge unsigned int id; 445a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx; 4460d160211SJeremy Fitzhardinge grant_ref_t ref; 44730c5d7f0SJulien Grall /* convenient aliases */ 44830c5d7f0SJulien Grall struct page *page = info->page; 44930c5d7f0SJulien Grall struct netfront_queue *queue = info->queue; 45030c5d7f0SJulien Grall struct sk_buff *skb = info->skb; 4510d160211SJeremy Fitzhardinge 4522688fcb7SAndrew J. Bennieston id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); 453a55e8bb8SDavid Vrabel tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 4542688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_tx_head); 455269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 4560d160211SJeremy Fitzhardinge 45730c5d7f0SJulien Grall gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, 45830c5d7f0SJulien Grall gfn, GNTMAP_readonly); 4590d160211SJeremy Fitzhardinge 460a55e8bb8SDavid Vrabel queue->tx_skbs[id].skb = skb; 461a55e8bb8SDavid Vrabel queue->grant_tx_page[id] = page; 462a55e8bb8SDavid Vrabel queue->grant_tx_ref[id] = ref; 463a55e8bb8SDavid Vrabel 464a55e8bb8SDavid Vrabel tx->id = id; 465a55e8bb8SDavid Vrabel tx->gref = ref; 4660d160211SJeremy Fitzhardinge tx->offset = offset; 4670d160211SJeremy Fitzhardinge tx->size = len; 4680d160211SJeremy Fitzhardinge tx->flags = 0; 469a55e8bb8SDavid Vrabel 47030c5d7f0SJulien Grall info->tx = tx; 47130c5d7f0SJulien Grall info->size += tx->size; 47230c5d7f0SJulien Grall } 47330c5d7f0SJulien Grall 47430c5d7f0SJulien Grall static struct xen_netif_tx_request *xennet_make_first_txreq( 47530c5d7f0SJulien Grall struct netfront_queue *queue, struct sk_buff *skb, 47630c5d7f0SJulien Grall struct page *page, unsigned int offset, unsigned int len) 47730c5d7f0SJulien Grall { 47830c5d7f0SJulien Grall struct xennet_gnttab_make_txreq info = { 47930c5d7f0SJulien Grall .queue = queue, 48030c5d7f0SJulien Grall .skb = skb, 48130c5d7f0SJulien Grall .page = page, 48230c5d7f0SJulien Grall .size = 0, 48330c5d7f0SJulien Grall }; 48430c5d7f0SJulien Grall 48530c5d7f0SJulien Grall gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info); 48630c5d7f0SJulien Grall 48730c5d7f0SJulien Grall return info.tx; 48830c5d7f0SJulien Grall } 48930c5d7f0SJulien Grall 49030c5d7f0SJulien Grall static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, 49130c5d7f0SJulien Grall unsigned int len, void *data) 49230c5d7f0SJulien Grall { 49330c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 49430c5d7f0SJulien Grall 49530c5d7f0SJulien Grall info->tx->flags |= XEN_NETTXF_more_data; 49630c5d7f0SJulien Grall skb_get(info->skb); 49730c5d7f0SJulien Grall xennet_tx_setup_grant(gfn, offset, len, data); 4980d160211SJeremy Fitzhardinge } 4990d160211SJeremy Fitzhardinge 500a55e8bb8SDavid Vrabel static struct xen_netif_tx_request *xennet_make_txreqs( 501a55e8bb8SDavid Vrabel struct netfront_queue *queue, struct xen_netif_tx_request *tx, 502a55e8bb8SDavid Vrabel struct sk_buff *skb, struct page *page, 503a55e8bb8SDavid Vrabel unsigned int offset, unsigned int len) 504a55e8bb8SDavid Vrabel { 50530c5d7f0SJulien Grall struct xennet_gnttab_make_txreq info = { 50630c5d7f0SJulien Grall .queue = queue, 50730c5d7f0SJulien Grall .skb = skb, 50830c5d7f0SJulien Grall .tx = tx, 50930c5d7f0SJulien Grall }; 51030c5d7f0SJulien Grall 511f36c3747SIan Campbell /* Skip unused frames from start of page */ 512f36c3747SIan Campbell page += offset >> PAGE_SHIFT; 513f36c3747SIan Campbell offset &= ~PAGE_MASK; 514f36c3747SIan Campbell 515a55e8bb8SDavid Vrabel while (len) { 51630c5d7f0SJulien Grall info.page = page; 51730c5d7f0SJulien Grall info.size = 0; 51830c5d7f0SJulien Grall 51930c5d7f0SJulien Grall gnttab_foreach_grant_in_range(page, offset, len, 52030c5d7f0SJulien Grall xennet_make_one_txreq, 52130c5d7f0SJulien Grall &info); 52230c5d7f0SJulien Grall 523f36c3747SIan Campbell page++; 524f36c3747SIan Campbell offset = 0; 52530c5d7f0SJulien Grall len -= info.size; 5260d160211SJeremy Fitzhardinge } 5270d160211SJeremy Fitzhardinge 52830c5d7f0SJulien Grall return info.tx; 5290d160211SJeremy Fitzhardinge } 5300d160211SJeremy Fitzhardinge 531f36c3747SIan Campbell /* 532e84448d5SDavid Vrabel * Count how many ring slots are required to send this skb. Each frag 533e84448d5SDavid Vrabel * might be a compound page. 534f36c3747SIan Campbell */ 535e84448d5SDavid Vrabel static int xennet_count_skb_slots(struct sk_buff *skb) 536f36c3747SIan Campbell { 537f36c3747SIan Campbell int i, frags = skb_shinfo(skb)->nr_frags; 53830c5d7f0SJulien Grall int slots; 539e84448d5SDavid Vrabel 54030c5d7f0SJulien Grall slots = gnttab_count_grant(offset_in_page(skb->data), 54130c5d7f0SJulien Grall skb_headlen(skb)); 542f36c3747SIan Campbell 543f36c3747SIan Campbell for (i = 0; i < frags; i++) { 544f36c3747SIan Campbell skb_frag_t *frag = skb_shinfo(skb)->frags + i; 545f36c3747SIan Campbell unsigned long size = skb_frag_size(frag); 546b54c9d5bSJonathan Lemon unsigned long offset = skb_frag_off(frag); 547f36c3747SIan Campbell 548f36c3747SIan Campbell /* Skip unused frames from start of page */ 549f36c3747SIan Campbell offset &= ~PAGE_MASK; 550f36c3747SIan Campbell 55130c5d7f0SJulien Grall slots += gnttab_count_grant(offset, size); 552f36c3747SIan Campbell } 553f36c3747SIan Campbell 55430c5d7f0SJulien Grall return slots; 555f36c3747SIan Campbell } 556f36c3747SIan Campbell 55750ee6061SAndrew J. Bennieston static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, 558a350ecceSPaolo Abeni struct net_device *sb_dev) 5592688fcb7SAndrew J. Bennieston { 56050ee6061SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 56150ee6061SAndrew J. Bennieston u32 hash; 56250ee6061SAndrew J. Bennieston u16 queue_idx; 56350ee6061SAndrew J. Bennieston 56450ee6061SAndrew J. Bennieston /* First, check if there is only one queue */ 56550ee6061SAndrew J. Bennieston if (num_queues == 1) { 56650ee6061SAndrew J. Bennieston queue_idx = 0; 56750ee6061SAndrew J. Bennieston } else { 56850ee6061SAndrew J. Bennieston hash = skb_get_hash(skb); 56950ee6061SAndrew J. Bennieston queue_idx = hash % num_queues; 57050ee6061SAndrew J. Bennieston } 57150ee6061SAndrew J. Bennieston 57250ee6061SAndrew J. Bennieston return queue_idx; 5732688fcb7SAndrew J. Bennieston } 5742688fcb7SAndrew J. Bennieston 5756c5aa6fcSDenis Kirjanov static int xennet_xdp_xmit_one(struct net_device *dev, 5766c5aa6fcSDenis Kirjanov struct netfront_queue *queue, 5776c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf) 5786c5aa6fcSDenis Kirjanov { 5796c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 5806c5aa6fcSDenis Kirjanov struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 5816c5aa6fcSDenis Kirjanov int notify; 5826c5aa6fcSDenis Kirjanov 5836c5aa6fcSDenis Kirjanov xennet_make_first_txreq(queue, NULL, 5846c5aa6fcSDenis Kirjanov virt_to_page(xdpf->data), 5856c5aa6fcSDenis Kirjanov offset_in_page(xdpf->data), 5866c5aa6fcSDenis Kirjanov xdpf->len); 5876c5aa6fcSDenis Kirjanov 5886c5aa6fcSDenis Kirjanov RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 5896c5aa6fcSDenis Kirjanov if (notify) 5906c5aa6fcSDenis Kirjanov notify_remote_via_irq(queue->tx_irq); 5916c5aa6fcSDenis Kirjanov 5926c5aa6fcSDenis Kirjanov u64_stats_update_begin(&tx_stats->syncp); 5936c5aa6fcSDenis Kirjanov tx_stats->bytes += xdpf->len; 5946c5aa6fcSDenis Kirjanov tx_stats->packets++; 5956c5aa6fcSDenis Kirjanov u64_stats_update_end(&tx_stats->syncp); 5966c5aa6fcSDenis Kirjanov 5976c5aa6fcSDenis Kirjanov xennet_tx_buf_gc(queue); 5986c5aa6fcSDenis Kirjanov 5996c5aa6fcSDenis Kirjanov return 0; 6006c5aa6fcSDenis Kirjanov } 6016c5aa6fcSDenis Kirjanov 6026c5aa6fcSDenis Kirjanov static int xennet_xdp_xmit(struct net_device *dev, int n, 6036c5aa6fcSDenis Kirjanov struct xdp_frame **frames, u32 flags) 6046c5aa6fcSDenis Kirjanov { 6056c5aa6fcSDenis Kirjanov unsigned int num_queues = dev->real_num_tx_queues; 6066c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 6076c5aa6fcSDenis Kirjanov struct netfront_queue *queue = NULL; 6086c5aa6fcSDenis Kirjanov unsigned long irq_flags; 6096c5aa6fcSDenis Kirjanov int drops = 0; 6106c5aa6fcSDenis Kirjanov int i, err; 6116c5aa6fcSDenis Kirjanov 6126c5aa6fcSDenis Kirjanov if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 6136c5aa6fcSDenis Kirjanov return -EINVAL; 6146c5aa6fcSDenis Kirjanov 6156c5aa6fcSDenis Kirjanov queue = &np->queues[smp_processor_id() % num_queues]; 6166c5aa6fcSDenis Kirjanov 6176c5aa6fcSDenis Kirjanov spin_lock_irqsave(&queue->tx_lock, irq_flags); 6186c5aa6fcSDenis Kirjanov for (i = 0; i < n; i++) { 6196c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf = frames[i]; 6206c5aa6fcSDenis Kirjanov 6216c5aa6fcSDenis Kirjanov if (!xdpf) 6226c5aa6fcSDenis Kirjanov continue; 6236c5aa6fcSDenis Kirjanov err = xennet_xdp_xmit_one(dev, queue, xdpf); 6246c5aa6fcSDenis Kirjanov if (err) { 6256c5aa6fcSDenis Kirjanov xdp_return_frame_rx_napi(xdpf); 6266c5aa6fcSDenis Kirjanov drops++; 6276c5aa6fcSDenis Kirjanov } 6286c5aa6fcSDenis Kirjanov } 6296c5aa6fcSDenis Kirjanov spin_unlock_irqrestore(&queue->tx_lock, irq_flags); 6306c5aa6fcSDenis Kirjanov 6316c5aa6fcSDenis Kirjanov return n - drops; 6326c5aa6fcSDenis Kirjanov } 6336c5aa6fcSDenis Kirjanov 6346c5aa6fcSDenis Kirjanov 63530c5d7f0SJulien Grall #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) 63630c5d7f0SJulien Grall 63724a94b3cSLuc Van Oostenryck static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 6380d160211SJeremy Fitzhardinge { 6390d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 640900e1833SDavid Vrabel struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 641a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx, *first_tx; 642a55e8bb8SDavid Vrabel unsigned int i; 6430d160211SJeremy Fitzhardinge int notify; 644f36c3747SIan Campbell int slots; 645a55e8bb8SDavid Vrabel struct page *page; 646a55e8bb8SDavid Vrabel unsigned int offset; 647a55e8bb8SDavid Vrabel unsigned int len; 648cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 6492688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 6502688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 6512688fcb7SAndrew J. Bennieston u16 queue_index; 652fd07160bSVitaly Kuznetsov struct sk_buff *nskb; 6532688fcb7SAndrew J. Bennieston 6542688fcb7SAndrew J. Bennieston /* Drop the packet if no queues are set up */ 6552688fcb7SAndrew J. Bennieston if (num_queues < 1) 6562688fcb7SAndrew J. Bennieston goto drop; 6572688fcb7SAndrew J. Bennieston /* Determine which queue to transmit this SKB on */ 6582688fcb7SAndrew J. Bennieston queue_index = skb_get_queue_mapping(skb); 6592688fcb7SAndrew J. Bennieston queue = &np->queues[queue_index]; 6600d160211SJeremy Fitzhardinge 6619ecd1a75SWei Liu /* If skb->len is too big for wire format, drop skb and alert 6629ecd1a75SWei Liu * user about misconfiguration. 6639ecd1a75SWei Liu */ 6649ecd1a75SWei Liu if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { 6659ecd1a75SWei Liu net_alert_ratelimited( 6669ecd1a75SWei Liu "xennet: skb->len = %u, too big for wire format\n", 6679ecd1a75SWei Liu skb->len); 6689ecd1a75SWei Liu goto drop; 6699ecd1a75SWei Liu } 6709ecd1a75SWei Liu 671e84448d5SDavid Vrabel slots = xennet_count_skb_slots(skb); 67230c5d7f0SJulien Grall if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { 67397a6d1bbSZoltan Kiss net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", 67497a6d1bbSZoltan Kiss slots, skb->len); 67597a6d1bbSZoltan Kiss if (skb_linearize(skb)) 6760d160211SJeremy Fitzhardinge goto drop; 6770d160211SJeremy Fitzhardinge } 6780d160211SJeremy Fitzhardinge 679a55e8bb8SDavid Vrabel page = virt_to_page(skb->data); 680a55e8bb8SDavid Vrabel offset = offset_in_page(skb->data); 681fd07160bSVitaly Kuznetsov 682fd07160bSVitaly Kuznetsov /* The first req should be at least ETH_HLEN size or the packet will be 683fd07160bSVitaly Kuznetsov * dropped by netback. 684fd07160bSVitaly Kuznetsov */ 685fd07160bSVitaly Kuznetsov if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { 686fd07160bSVitaly Kuznetsov nskb = skb_copy(skb, GFP_ATOMIC); 687fd07160bSVitaly Kuznetsov if (!nskb) 688fd07160bSVitaly Kuznetsov goto drop; 68962f3250fSEric Dumazet dev_consume_skb_any(skb); 690fd07160bSVitaly Kuznetsov skb = nskb; 691fd07160bSVitaly Kuznetsov page = virt_to_page(skb->data); 692fd07160bSVitaly Kuznetsov offset = offset_in_page(skb->data); 693fd07160bSVitaly Kuznetsov } 694fd07160bSVitaly Kuznetsov 695a55e8bb8SDavid Vrabel len = skb_headlen(skb); 696a55e8bb8SDavid Vrabel 6972688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 6980d160211SJeremy Fitzhardinge 6990d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 700f36c3747SIan Campbell (slots > 1 && !xennet_can_sg(dev)) || 7018b86a61dSJohannes Berg netif_needs_gso(skb, netif_skb_features(skb)))) { 7022688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 7030d160211SJeremy Fitzhardinge goto drop; 7040d160211SJeremy Fitzhardinge } 7050d160211SJeremy Fitzhardinge 706a55e8bb8SDavid Vrabel /* First request for the linear area. */ 70730c5d7f0SJulien Grall first_tx = tx = xennet_make_first_txreq(queue, skb, 708a55e8bb8SDavid Vrabel page, offset, len); 70930c5d7f0SJulien Grall offset += tx->size; 71030c5d7f0SJulien Grall if (offset == PAGE_SIZE) { 711a55e8bb8SDavid Vrabel page++; 712a55e8bb8SDavid Vrabel offset = 0; 71330c5d7f0SJulien Grall } 714a55e8bb8SDavid Vrabel len -= tx->size; 7150d160211SJeremy Fitzhardinge 7160d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 7170d160211SJeremy Fitzhardinge /* local packet? */ 718f942dc25SIan Campbell tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; 7190d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 7200d160211SJeremy Fitzhardinge /* remote but checksummed. */ 721f942dc25SIan Campbell tx->flags |= XEN_NETTXF_data_validated; 7220d160211SJeremy Fitzhardinge 723a55e8bb8SDavid Vrabel /* Optional extra info after the first request. */ 7240d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 7250d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 7260d160211SJeremy Fitzhardinge 7270d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 728a55e8bb8SDavid Vrabel RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 7290d160211SJeremy Fitzhardinge 730f942dc25SIan Campbell tx->flags |= XEN_NETTXF_extra_info; 7310d160211SJeremy Fitzhardinge 7320d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 7332c0057deSPaul Durrant gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? 7342c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV6 : 7352c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV4; 7360d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 7370d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 7380d160211SJeremy Fitzhardinge 7390d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 7400d160211SJeremy Fitzhardinge gso->flags = 0; 7410d160211SJeremy Fitzhardinge } 7420d160211SJeremy Fitzhardinge 743a55e8bb8SDavid Vrabel /* Requests for the rest of the linear area. */ 744a55e8bb8SDavid Vrabel tx = xennet_make_txreqs(queue, tx, skb, page, offset, len); 7450d160211SJeremy Fitzhardinge 746a55e8bb8SDavid Vrabel /* Requests for all the frags. */ 747a55e8bb8SDavid Vrabel for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 748a55e8bb8SDavid Vrabel skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 749b54c9d5bSJonathan Lemon tx = xennet_make_txreqs(queue, tx, skb, skb_frag_page(frag), 750b54c9d5bSJonathan Lemon skb_frag_off(frag), 751a55e8bb8SDavid Vrabel skb_frag_size(frag)); 752a55e8bb8SDavid Vrabel } 753a55e8bb8SDavid Vrabel 754a55e8bb8SDavid Vrabel /* First request has the packet length. */ 755a55e8bb8SDavid Vrabel first_tx->size = skb->len; 7560d160211SJeremy Fitzhardinge 7572688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 7580d160211SJeremy Fitzhardinge if (notify) 7592688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 7600d160211SJeremy Fitzhardinge 761900e1833SDavid Vrabel u64_stats_update_begin(&tx_stats->syncp); 762900e1833SDavid Vrabel tx_stats->bytes += skb->len; 763900e1833SDavid Vrabel tx_stats->packets++; 764900e1833SDavid Vrabel u64_stats_update_end(&tx_stats->syncp); 76510a273a6SJeremy Fitzhardinge 76610a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 7672688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 7680d160211SJeremy Fitzhardinge 7692688fcb7SAndrew J. Bennieston if (!netfront_tx_slot_available(queue)) 7702688fcb7SAndrew J. Bennieston netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); 7710d160211SJeremy Fitzhardinge 7722688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 7730d160211SJeremy Fitzhardinge 7746ed10654SPatrick McHardy return NETDEV_TX_OK; 7750d160211SJeremy Fitzhardinge 7760d160211SJeremy Fitzhardinge drop: 77709f75cd7SJeff Garzik dev->stats.tx_dropped++; 778979de8a0SEric W. Biederman dev_kfree_skb_any(skb); 7796ed10654SPatrick McHardy return NETDEV_TX_OK; 7800d160211SJeremy Fitzhardinge } 7810d160211SJeremy Fitzhardinge 7820d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 7830d160211SJeremy Fitzhardinge { 7840d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 7852688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 7862688fcb7SAndrew J. Bennieston unsigned int i; 7872688fcb7SAndrew J. Bennieston struct netfront_queue *queue; 7882688fcb7SAndrew J. Bennieston netif_tx_stop_all_queues(np->netdev); 7892688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 7902688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 7912688fcb7SAndrew J. Bennieston napi_disable(&queue->napi); 7922688fcb7SAndrew J. Bennieston } 7930d160211SJeremy Fitzhardinge return 0; 7940d160211SJeremy Fitzhardinge } 7950d160211SJeremy Fitzhardinge 7962688fcb7SAndrew J. Bennieston static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, 7970d160211SJeremy Fitzhardinge grant_ref_t ref) 7980d160211SJeremy Fitzhardinge { 7992688fcb7SAndrew J. Bennieston int new = xennet_rxidx(queue->rx.req_prod_pvt); 8000d160211SJeremy Fitzhardinge 8012688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[new]); 8022688fcb7SAndrew J. Bennieston queue->rx_skbs[new] = skb; 8032688fcb7SAndrew J. Bennieston queue->grant_rx_ref[new] = ref; 8042688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; 8052688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; 8062688fcb7SAndrew J. Bennieston queue->rx.req_prod_pvt++; 8070d160211SJeremy Fitzhardinge } 8080d160211SJeremy Fitzhardinge 8092688fcb7SAndrew J. Bennieston static int xennet_get_extras(struct netfront_queue *queue, 8100d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 8110d160211SJeremy Fitzhardinge RING_IDX rp) 8120d160211SJeremy Fitzhardinge 8130d160211SJeremy Fitzhardinge { 8140d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 8152688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 8162688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 8170d160211SJeremy Fitzhardinge int err = 0; 8180d160211SJeremy Fitzhardinge 8190d160211SJeremy Fitzhardinge do { 8200d160211SJeremy Fitzhardinge struct sk_buff *skb; 8210d160211SJeremy Fitzhardinge grant_ref_t ref; 8220d160211SJeremy Fitzhardinge 8230d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 8240d160211SJeremy Fitzhardinge if (net_ratelimit()) 8250d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 8260d160211SJeremy Fitzhardinge err = -EBADR; 8270d160211SJeremy Fitzhardinge break; 8280d160211SJeremy Fitzhardinge } 8290d160211SJeremy Fitzhardinge 8300d160211SJeremy Fitzhardinge extra = (struct xen_netif_extra_info *) 8312688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 8320d160211SJeremy Fitzhardinge 8330d160211SJeremy Fitzhardinge if (unlikely(!extra->type || 8340d160211SJeremy Fitzhardinge extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 8350d160211SJeremy Fitzhardinge if (net_ratelimit()) 8360d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 8370d160211SJeremy Fitzhardinge extra->type); 8380d160211SJeremy Fitzhardinge err = -EINVAL; 8390d160211SJeremy Fitzhardinge } else { 8400d160211SJeremy Fitzhardinge memcpy(&extras[extra->type - 1], extra, 8410d160211SJeremy Fitzhardinge sizeof(*extra)); 8420d160211SJeremy Fitzhardinge } 8430d160211SJeremy Fitzhardinge 8442688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons); 8452688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons); 8462688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 8470d160211SJeremy Fitzhardinge } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 8480d160211SJeremy Fitzhardinge 8492688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons; 8500d160211SJeremy Fitzhardinge return err; 8510d160211SJeremy Fitzhardinge } 8520d160211SJeremy Fitzhardinge 8536c5aa6fcSDenis Kirjanov static u32 xennet_run_xdp(struct netfront_queue *queue, struct page *pdata, 8546c5aa6fcSDenis Kirjanov struct xen_netif_rx_response *rx, struct bpf_prog *prog, 8556c5aa6fcSDenis Kirjanov struct xdp_buff *xdp, bool *need_xdp_flush) 8566c5aa6fcSDenis Kirjanov { 8576c5aa6fcSDenis Kirjanov struct xdp_frame *xdpf; 8586c5aa6fcSDenis Kirjanov u32 len = rx->status; 8596c5aa6fcSDenis Kirjanov u32 act = XDP_PASS; 8606c5aa6fcSDenis Kirjanov int err; 8616c5aa6fcSDenis Kirjanov 8626c5aa6fcSDenis Kirjanov xdp->data_hard_start = page_address(pdata); 8636c5aa6fcSDenis Kirjanov xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM; 8646c5aa6fcSDenis Kirjanov xdp_set_data_meta_invalid(xdp); 8656c5aa6fcSDenis Kirjanov xdp->data_end = xdp->data + len; 8666c5aa6fcSDenis Kirjanov xdp->rxq = &queue->xdp_rxq; 8676c5aa6fcSDenis Kirjanov xdp->frame_sz = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM; 8686c5aa6fcSDenis Kirjanov 8696c5aa6fcSDenis Kirjanov act = bpf_prog_run_xdp(prog, xdp); 8706c5aa6fcSDenis Kirjanov switch (act) { 8716c5aa6fcSDenis Kirjanov case XDP_TX: 8726c5aa6fcSDenis Kirjanov get_page(pdata); 8736c5aa6fcSDenis Kirjanov xdpf = xdp_convert_buff_to_frame(xdp); 8746c5aa6fcSDenis Kirjanov err = xennet_xdp_xmit(queue->info->netdev, 1, &xdpf, 0); 8756c5aa6fcSDenis Kirjanov if (unlikely(err < 0)) 8766c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 8776c5aa6fcSDenis Kirjanov break; 8786c5aa6fcSDenis Kirjanov case XDP_REDIRECT: 8796c5aa6fcSDenis Kirjanov get_page(pdata); 8806c5aa6fcSDenis Kirjanov err = xdp_do_redirect(queue->info->netdev, xdp, prog); 8816c5aa6fcSDenis Kirjanov *need_xdp_flush = true; 8826c5aa6fcSDenis Kirjanov if (unlikely(err)) 8836c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 8846c5aa6fcSDenis Kirjanov break; 8856c5aa6fcSDenis Kirjanov case XDP_PASS: 8866c5aa6fcSDenis Kirjanov case XDP_DROP: 8876c5aa6fcSDenis Kirjanov break; 8886c5aa6fcSDenis Kirjanov 8896c5aa6fcSDenis Kirjanov case XDP_ABORTED: 8906c5aa6fcSDenis Kirjanov trace_xdp_exception(queue->info->netdev, prog, act); 8916c5aa6fcSDenis Kirjanov break; 8926c5aa6fcSDenis Kirjanov 8936c5aa6fcSDenis Kirjanov default: 8946c5aa6fcSDenis Kirjanov bpf_warn_invalid_xdp_action(act); 8956c5aa6fcSDenis Kirjanov } 8966c5aa6fcSDenis Kirjanov 8976c5aa6fcSDenis Kirjanov return act; 8986c5aa6fcSDenis Kirjanov } 8996c5aa6fcSDenis Kirjanov 9002688fcb7SAndrew J. Bennieston static int xennet_get_responses(struct netfront_queue *queue, 9010d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 9026c5aa6fcSDenis Kirjanov struct sk_buff_head *list, 9036c5aa6fcSDenis Kirjanov bool *need_xdp_flush) 9040d160211SJeremy Fitzhardinge { 9050d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo->rx; 9066c5aa6fcSDenis Kirjanov int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); 9072688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 9082688fcb7SAndrew J. Bennieston struct sk_buff *skb = xennet_get_rx_skb(queue, cons); 9096c5aa6fcSDenis Kirjanov struct xen_netif_extra_info *extras = rinfo->extras; 9102688fcb7SAndrew J. Bennieston grant_ref_t ref = xennet_get_rx_ref(queue, cons); 9116c5aa6fcSDenis Kirjanov struct device *dev = &queue->info->netdev->dev; 9126c5aa6fcSDenis Kirjanov struct bpf_prog *xdp_prog; 9136c5aa6fcSDenis Kirjanov struct xdp_buff xdp; 9146c5aa6fcSDenis Kirjanov unsigned long ret; 9157158ff6dSWei Liu int slots = 1; 9160d160211SJeremy Fitzhardinge int err = 0; 9176c5aa6fcSDenis Kirjanov u32 verdict; 9180d160211SJeremy Fitzhardinge 919f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_extra_info) { 9202688fcb7SAndrew J. Bennieston err = xennet_get_extras(queue, extras, rp); 9216c5aa6fcSDenis Kirjanov if (!err) { 9226c5aa6fcSDenis Kirjanov if (extras[XEN_NETIF_EXTRA_TYPE_XDP - 1].type) { 9236c5aa6fcSDenis Kirjanov struct xen_netif_extra_info *xdp; 9246c5aa6fcSDenis Kirjanov 9256c5aa6fcSDenis Kirjanov xdp = &extras[XEN_NETIF_EXTRA_TYPE_XDP - 1]; 9266c5aa6fcSDenis Kirjanov rx->offset = xdp->u.xdp.headroom; 9276c5aa6fcSDenis Kirjanov } 9286c5aa6fcSDenis Kirjanov } 9292688fcb7SAndrew J. Bennieston cons = queue->rx.rsp_cons; 9300d160211SJeremy Fitzhardinge } 9310d160211SJeremy Fitzhardinge 9320d160211SJeremy Fitzhardinge for (;;) { 9330d160211SJeremy Fitzhardinge if (unlikely(rx->status < 0 || 93430c5d7f0SJulien Grall rx->offset + rx->status > XEN_PAGE_SIZE)) { 9350d160211SJeremy Fitzhardinge if (net_ratelimit()) 9366c10127dSJulien Grall dev_warn(dev, "rx->offset: %u, size: %d\n", 9370d160211SJeremy Fitzhardinge rx->offset, rx->status); 9382688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 9390d160211SJeremy Fitzhardinge err = -EINVAL; 9400d160211SJeremy Fitzhardinge goto next; 9410d160211SJeremy Fitzhardinge } 9420d160211SJeremy Fitzhardinge 9430d160211SJeremy Fitzhardinge /* 9440d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 9450d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 946697089dcSWei Liu * situation to the system controller to reboot the backend. 9470d160211SJeremy Fitzhardinge */ 9480d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 9490d160211SJeremy Fitzhardinge if (net_ratelimit()) 9500d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 9510d160211SJeremy Fitzhardinge rx->id); 9520d160211SJeremy Fitzhardinge err = -EINVAL; 9530d160211SJeremy Fitzhardinge goto next; 9540d160211SJeremy Fitzhardinge } 9550d160211SJeremy Fitzhardinge 9560d160211SJeremy Fitzhardinge ret = gnttab_end_foreign_access_ref(ref, 0); 9570d160211SJeremy Fitzhardinge BUG_ON(!ret); 9580d160211SJeremy Fitzhardinge 9592688fcb7SAndrew J. Bennieston gnttab_release_grant_reference(&queue->gref_rx_head, ref); 9600d160211SJeremy Fitzhardinge 9616c5aa6fcSDenis Kirjanov rcu_read_lock(); 9626c5aa6fcSDenis Kirjanov xdp_prog = rcu_dereference(queue->xdp_prog); 9636c5aa6fcSDenis Kirjanov if (xdp_prog) { 9646c5aa6fcSDenis Kirjanov if (!(rx->flags & XEN_NETRXF_more_data)) { 9656c5aa6fcSDenis Kirjanov /* currently only a single page contains data */ 9666c5aa6fcSDenis Kirjanov verdict = xennet_run_xdp(queue, 9676c5aa6fcSDenis Kirjanov skb_frag_page(&skb_shinfo(skb)->frags[0]), 9686c5aa6fcSDenis Kirjanov rx, xdp_prog, &xdp, need_xdp_flush); 9696c5aa6fcSDenis Kirjanov if (verdict != XDP_PASS) 9706c5aa6fcSDenis Kirjanov err = -EINVAL; 9716c5aa6fcSDenis Kirjanov } else { 9726c5aa6fcSDenis Kirjanov /* drop the frame */ 9736c5aa6fcSDenis Kirjanov err = -EINVAL; 9746c5aa6fcSDenis Kirjanov } 9756c5aa6fcSDenis Kirjanov } 9766c5aa6fcSDenis Kirjanov rcu_read_unlock(); 9770d160211SJeremy Fitzhardinge next: 9786c5aa6fcSDenis Kirjanov __skb_queue_tail(list, skb); 979f942dc25SIan Campbell if (!(rx->flags & XEN_NETRXF_more_data)) 9800d160211SJeremy Fitzhardinge break; 9810d160211SJeremy Fitzhardinge 9827158ff6dSWei Liu if (cons + slots == rp) { 9830d160211SJeremy Fitzhardinge if (net_ratelimit()) 9847158ff6dSWei Liu dev_warn(dev, "Need more slots\n"); 9850d160211SJeremy Fitzhardinge err = -ENOENT; 9860d160211SJeremy Fitzhardinge break; 9870d160211SJeremy Fitzhardinge } 9880d160211SJeremy Fitzhardinge 9892688fcb7SAndrew J. Bennieston rx = RING_GET_RESPONSE(&queue->rx, cons + slots); 9902688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons + slots); 9912688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons + slots); 9927158ff6dSWei Liu slots++; 9930d160211SJeremy Fitzhardinge } 9940d160211SJeremy Fitzhardinge 9957158ff6dSWei Liu if (unlikely(slots > max)) { 9960d160211SJeremy Fitzhardinge if (net_ratelimit()) 997697089dcSWei Liu dev_warn(dev, "Too many slots\n"); 9980d160211SJeremy Fitzhardinge err = -E2BIG; 9990d160211SJeremy Fitzhardinge } 10000d160211SJeremy Fitzhardinge 10010d160211SJeremy Fitzhardinge if (unlikely(err)) 10022688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons + slots; 10030d160211SJeremy Fitzhardinge 10040d160211SJeremy Fitzhardinge return err; 10050d160211SJeremy Fitzhardinge } 10060d160211SJeremy Fitzhardinge 10070d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 10080d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 10090d160211SJeremy Fitzhardinge { 10100d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 10110d160211SJeremy Fitzhardinge if (net_ratelimit()) 1012383eda32SJoe Perches pr_warn("GSO size must not be zero\n"); 10130d160211SJeremy Fitzhardinge return -EINVAL; 10140d160211SJeremy Fitzhardinge } 10150d160211SJeremy Fitzhardinge 10162c0057deSPaul Durrant if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && 10172c0057deSPaul Durrant gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { 10180d160211SJeremy Fitzhardinge if (net_ratelimit()) 1019383eda32SJoe Perches pr_warn("Bad GSO type %d\n", gso->u.gso.type); 10200d160211SJeremy Fitzhardinge return -EINVAL; 10210d160211SJeremy Fitzhardinge } 10220d160211SJeremy Fitzhardinge 10230d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 10242c0057deSPaul Durrant skb_shinfo(skb)->gso_type = 10252c0057deSPaul Durrant (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? 10262c0057deSPaul Durrant SKB_GSO_TCPV4 : 10272c0057deSPaul Durrant SKB_GSO_TCPV6; 10280d160211SJeremy Fitzhardinge 10290d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 10300d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 10310d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 10320d160211SJeremy Fitzhardinge 10330d160211SJeremy Fitzhardinge return 0; 10340d160211SJeremy Fitzhardinge } 10350d160211SJeremy Fitzhardinge 1036a761129eSDongli Zhang static int xennet_fill_frags(struct netfront_queue *queue, 10370d160211SJeremy Fitzhardinge struct sk_buff *skb, 10380d160211SJeremy Fitzhardinge struct sk_buff_head *list) 10390d160211SJeremy Fitzhardinge { 10402688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 10410d160211SJeremy Fitzhardinge struct sk_buff *nskb; 10420d160211SJeremy Fitzhardinge 10430d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 10440d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = 10452688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 104601c68026SIan Campbell skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; 10470d160211SJeremy Fitzhardinge 1048d472b3a6SJuergen Gross if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { 1049093b9c71SJan Beulich unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 10500d160211SJeremy Fitzhardinge 1051d81c5054SJuergen Gross BUG_ON(pull_to < skb_headlen(skb)); 1052093b9c71SJan Beulich __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 1053093b9c71SJan Beulich } 1054ad4f15dcSJuergen Gross if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { 105500b36850SDongli Zhang queue->rx.rsp_cons = ++cons + skb_queue_len(list); 1056ad4f15dcSJuergen Gross kfree_skb(nskb); 1057a761129eSDongli Zhang return -ENOENT; 1058ad4f15dcSJuergen Gross } 1059093b9c71SJan Beulich 1060d472b3a6SJuergen Gross skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 1061d472b3a6SJuergen Gross skb_frag_page(nfrag), 1062093b9c71SJan Beulich rx->offset, rx->status, PAGE_SIZE); 10630d160211SJeremy Fitzhardinge 10640d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 10650d160211SJeremy Fitzhardinge kfree_skb(nskb); 10660d160211SJeremy Fitzhardinge } 10670d160211SJeremy Fitzhardinge 1068a761129eSDongli Zhang queue->rx.rsp_cons = cons; 1069a761129eSDongli Zhang 1070a761129eSDongli Zhang return 0; 10710d160211SJeremy Fitzhardinge } 10720d160211SJeremy Fitzhardinge 1073e0ce4af9SIan Campbell static int checksum_setup(struct net_device *dev, struct sk_buff *skb) 10740d160211SJeremy Fitzhardinge { 1075b5cf66cdSPaul Durrant bool recalculate_partial_csum = false; 1076e0ce4af9SIan Campbell 1077e0ce4af9SIan Campbell /* 1078e0ce4af9SIan Campbell * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy 1079e0ce4af9SIan Campbell * peers can fail to set NETRXF_csum_blank when sending a GSO 1080e0ce4af9SIan Campbell * frame. In this case force the SKB to CHECKSUM_PARTIAL and 1081e0ce4af9SIan Campbell * recalculate the partial checksum. 1082e0ce4af9SIan Campbell */ 1083e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { 1084e0ce4af9SIan Campbell struct netfront_info *np = netdev_priv(dev); 10852688fcb7SAndrew J. Bennieston atomic_inc(&np->rx_gso_checksum_fixup); 1086e0ce4af9SIan Campbell skb->ip_summed = CHECKSUM_PARTIAL; 1087b5cf66cdSPaul Durrant recalculate_partial_csum = true; 1088e0ce4af9SIan Campbell } 1089e0ce4af9SIan Campbell 1090e0ce4af9SIan Campbell /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ 1091e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL) 1092e0ce4af9SIan Campbell return 0; 10930d160211SJeremy Fitzhardinge 1094b5cf66cdSPaul Durrant return skb_checksum_setup(skb, recalculate_partial_csum); 10950d160211SJeremy Fitzhardinge } 10960d160211SJeremy Fitzhardinge 10972688fcb7SAndrew J. Bennieston static int handle_incoming_queue(struct netfront_queue *queue, 10980d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 10990d160211SJeremy Fitzhardinge { 1100900e1833SDavid Vrabel struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); 11010d160211SJeremy Fitzhardinge int packets_dropped = 0; 11020d160211SJeremy Fitzhardinge struct sk_buff *skb; 11030d160211SJeremy Fitzhardinge 11040d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 11053683243bSIan Campbell int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 11060d160211SJeremy Fitzhardinge 1107093b9c71SJan Beulich if (pull_to > skb_headlen(skb)) 11083683243bSIan Campbell __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 11090d160211SJeremy Fitzhardinge 11100d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 11112688fcb7SAndrew J. Bennieston skb->protocol = eth_type_trans(skb, queue->info->netdev); 1112d554f73dSWei Liu skb_reset_network_header(skb); 11130d160211SJeremy Fitzhardinge 11142688fcb7SAndrew J. Bennieston if (checksum_setup(queue->info->netdev, skb)) { 11150d160211SJeremy Fitzhardinge kfree_skb(skb); 11160d160211SJeremy Fitzhardinge packets_dropped++; 11172688fcb7SAndrew J. Bennieston queue->info->netdev->stats.rx_errors++; 11180d160211SJeremy Fitzhardinge continue; 11190d160211SJeremy Fitzhardinge } 11200d160211SJeremy Fitzhardinge 1121900e1833SDavid Vrabel u64_stats_update_begin(&rx_stats->syncp); 1122900e1833SDavid Vrabel rx_stats->packets++; 1123900e1833SDavid Vrabel rx_stats->bytes += skb->len; 1124900e1833SDavid Vrabel u64_stats_update_end(&rx_stats->syncp); 11250d160211SJeremy Fitzhardinge 11260d160211SJeremy Fitzhardinge /* Pass it up. */ 11272688fcb7SAndrew J. Bennieston napi_gro_receive(&queue->napi, skb); 11280d160211SJeremy Fitzhardinge } 11290d160211SJeremy Fitzhardinge 11300d160211SJeremy Fitzhardinge return packets_dropped; 11310d160211SJeremy Fitzhardinge } 11320d160211SJeremy Fitzhardinge 1133bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 11340d160211SJeremy Fitzhardinge { 11352688fcb7SAndrew J. Bennieston struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); 11362688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 11370d160211SJeremy Fitzhardinge struct sk_buff *skb; 11380d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 11390d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 11400d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 11410d160211SJeremy Fitzhardinge RING_IDX i, rp; 1142bea3348eSStephen Hemminger int work_done; 11430d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 11440d160211SJeremy Fitzhardinge struct sk_buff_head errq; 11450d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 11460d160211SJeremy Fitzhardinge int err; 11476c5aa6fcSDenis Kirjanov bool need_xdp_flush = false; 11480d160211SJeremy Fitzhardinge 11492688fcb7SAndrew J. Bennieston spin_lock(&queue->rx_lock); 11500d160211SJeremy Fitzhardinge 11510d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 11520d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 11530d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 11540d160211SJeremy Fitzhardinge 11552688fcb7SAndrew J. Bennieston rp = queue->rx.sring->rsp_prod; 11560d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 11570d160211SJeremy Fitzhardinge 11582688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 11590d160211SJeremy Fitzhardinge work_done = 0; 11600d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 11612688fcb7SAndrew J. Bennieston memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx)); 11620d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 11630d160211SJeremy Fitzhardinge 11646c5aa6fcSDenis Kirjanov err = xennet_get_responses(queue, &rinfo, rp, &tmpq, 11656c5aa6fcSDenis Kirjanov &need_xdp_flush); 11660d160211SJeremy Fitzhardinge 11670d160211SJeremy Fitzhardinge if (unlikely(err)) { 11680d160211SJeremy Fitzhardinge err: 11690d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 11700d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 117109f75cd7SJeff Garzik dev->stats.rx_errors++; 11722688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 11730d160211SJeremy Fitzhardinge continue; 11740d160211SJeremy Fitzhardinge } 11750d160211SJeremy Fitzhardinge 11760d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 11770d160211SJeremy Fitzhardinge 11780d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 11790d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 11800d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 11810d160211SJeremy Fitzhardinge 11820d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 11830d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 11842688fcb7SAndrew J. Bennieston queue->rx.rsp_cons += skb_queue_len(&tmpq); 11850d160211SJeremy Fitzhardinge goto err; 11860d160211SJeremy Fitzhardinge } 11870d160211SJeremy Fitzhardinge } 11880d160211SJeremy Fitzhardinge 11893683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = rx->status; 11903683243bSIan Campbell if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) 11913683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; 11920d160211SJeremy Fitzhardinge 1193b54c9d5bSJonathan Lemon skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset); 11943683243bSIan Campbell skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); 11953683243bSIan Campbell skb->data_len = rx->status; 1196093b9c71SJan Beulich skb->len += rx->status; 11970d160211SJeremy Fitzhardinge 1198a761129eSDongli Zhang if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) 1199ad4f15dcSJuergen Gross goto err; 12000d160211SJeremy Fitzhardinge 1201f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_csum_blank) 12020d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 1203f942dc25SIan Campbell else if (rx->flags & XEN_NETRXF_data_validated) 12040d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 12050d160211SJeremy Fitzhardinge 12060d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 12070d160211SJeremy Fitzhardinge 1208a761129eSDongli Zhang i = ++queue->rx.rsp_cons; 12090d160211SJeremy Fitzhardinge work_done++; 12100d160211SJeremy Fitzhardinge } 12116c5aa6fcSDenis Kirjanov if (need_xdp_flush) 12126c5aa6fcSDenis Kirjanov xdp_do_flush(); 12130d160211SJeremy Fitzhardinge 121456cfe5d0SWang Chen __skb_queue_purge(&errq); 12150d160211SJeremy Fitzhardinge 12162688fcb7SAndrew J. Bennieston work_done -= handle_incoming_queue(queue, &rxq); 12170d160211SJeremy Fitzhardinge 12182688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 12190d160211SJeremy Fitzhardinge 12200d160211SJeremy Fitzhardinge if (work_done < budget) { 1221bea3348eSStephen Hemminger int more_to_do = 0; 1222bea3348eSStephen Hemminger 12236ad20165SEric Dumazet napi_complete_done(napi, work_done); 12240d160211SJeremy Fitzhardinge 12252688fcb7SAndrew J. Bennieston RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); 12266a6dc08fSDavid Vrabel if (more_to_do) 12276a6dc08fSDavid Vrabel napi_schedule(napi); 12280d160211SJeremy Fitzhardinge } 12290d160211SJeremy Fitzhardinge 12302688fcb7SAndrew J. Bennieston spin_unlock(&queue->rx_lock); 12310d160211SJeremy Fitzhardinge 1232bea3348eSStephen Hemminger return work_done; 12330d160211SJeremy Fitzhardinge } 12340d160211SJeremy Fitzhardinge 12350d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 12360d160211SJeremy Fitzhardinge { 12370c36820eSJonathan Davies int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; 12380d160211SJeremy Fitzhardinge 12390d160211SJeremy Fitzhardinge if (mtu > max) 12400d160211SJeremy Fitzhardinge return -EINVAL; 12410d160211SJeremy Fitzhardinge dev->mtu = mtu; 12420d160211SJeremy Fitzhardinge return 0; 12430d160211SJeremy Fitzhardinge } 12440d160211SJeremy Fitzhardinge 1245bc1f4470Sstephen hemminger static void xennet_get_stats64(struct net_device *dev, 1246e00f85beSstephen hemminger struct rtnl_link_stats64 *tot) 1247e00f85beSstephen hemminger { 1248e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 1249e00f85beSstephen hemminger int cpu; 1250e00f85beSstephen hemminger 1251e00f85beSstephen hemminger for_each_possible_cpu(cpu) { 1252900e1833SDavid Vrabel struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); 1253900e1833SDavid Vrabel struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); 1254e00f85beSstephen hemminger u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1255e00f85beSstephen hemminger unsigned int start; 1256e00f85beSstephen hemminger 1257e00f85beSstephen hemminger do { 1258900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&tx_stats->syncp); 1259900e1833SDavid Vrabel tx_packets = tx_stats->packets; 1260900e1833SDavid Vrabel tx_bytes = tx_stats->bytes; 1261900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); 1262e00f85beSstephen hemminger 1263900e1833SDavid Vrabel do { 1264900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&rx_stats->syncp); 1265900e1833SDavid Vrabel rx_packets = rx_stats->packets; 1266900e1833SDavid Vrabel rx_bytes = rx_stats->bytes; 1267900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); 1268e00f85beSstephen hemminger 1269e00f85beSstephen hemminger tot->rx_packets += rx_packets; 1270e00f85beSstephen hemminger tot->tx_packets += tx_packets; 1271e00f85beSstephen hemminger tot->rx_bytes += rx_bytes; 1272e00f85beSstephen hemminger tot->tx_bytes += tx_bytes; 1273e00f85beSstephen hemminger } 1274e00f85beSstephen hemminger 1275e00f85beSstephen hemminger tot->rx_errors = dev->stats.rx_errors; 1276e00f85beSstephen hemminger tot->tx_dropped = dev->stats.tx_dropped; 1277e00f85beSstephen hemminger } 1278e00f85beSstephen hemminger 12792688fcb7SAndrew J. Bennieston static void xennet_release_tx_bufs(struct netfront_queue *queue) 12800d160211SJeremy Fitzhardinge { 12810d160211SJeremy Fitzhardinge struct sk_buff *skb; 12820d160211SJeremy Fitzhardinge int i; 12830d160211SJeremy Fitzhardinge 12840d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 12850d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 12862688fcb7SAndrew J. Bennieston if (skb_entry_is_link(&queue->tx_skbs[i])) 12870d160211SJeremy Fitzhardinge continue; 12880d160211SJeremy Fitzhardinge 12892688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[i].skb; 12902688fcb7SAndrew J. Bennieston get_page(queue->grant_tx_page[i]); 12912688fcb7SAndrew J. Bennieston gnttab_end_foreign_access(queue->grant_tx_ref[i], 1292cefe0078SAnnie Li GNTMAP_readonly, 12932688fcb7SAndrew J. Bennieston (unsigned long)page_address(queue->grant_tx_page[i])); 12942688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 12952688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 12962688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i); 12970d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 12980d160211SJeremy Fitzhardinge } 12990d160211SJeremy Fitzhardinge } 13000d160211SJeremy Fitzhardinge 13012688fcb7SAndrew J. Bennieston static void xennet_release_rx_bufs(struct netfront_queue *queue) 13020d160211SJeremy Fitzhardinge { 13030d160211SJeremy Fitzhardinge int id, ref; 13040d160211SJeremy Fitzhardinge 13052688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 13060d160211SJeremy Fitzhardinge 13070d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 1308cefe0078SAnnie Li struct sk_buff *skb; 1309cefe0078SAnnie Li struct page *page; 13100d160211SJeremy Fitzhardinge 13112688fcb7SAndrew J. Bennieston skb = queue->rx_skbs[id]; 1312cefe0078SAnnie Li if (!skb) 1313cefe0078SAnnie Li continue; 1314cefe0078SAnnie Li 13152688fcb7SAndrew J. Bennieston ref = queue->grant_rx_ref[id]; 1316cefe0078SAnnie Li if (ref == GRANT_INVALID_REF) 1317cefe0078SAnnie Li continue; 1318cefe0078SAnnie Li 1319cefe0078SAnnie Li page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 1320cefe0078SAnnie Li 1321cefe0078SAnnie Li /* gnttab_end_foreign_access() needs a page ref until 1322cefe0078SAnnie Li * foreign access is ended (which may be deferred). 1323cefe0078SAnnie Li */ 1324cefe0078SAnnie Li get_page(page); 1325cefe0078SAnnie Li gnttab_end_foreign_access(ref, 0, 1326cefe0078SAnnie Li (unsigned long)page_address(page)); 13272688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = GRANT_INVALID_REF; 13280d160211SJeremy Fitzhardinge 1329cefe0078SAnnie Li kfree_skb(skb); 13300d160211SJeremy Fitzhardinge } 13310d160211SJeremy Fitzhardinge 13322688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 13330d160211SJeremy Fitzhardinge } 13340d160211SJeremy Fitzhardinge 1335c8f44affSMichał Mirosław static netdev_features_t xennet_fix_features(struct net_device *dev, 1336c8f44affSMichał Mirosław netdev_features_t features) 13378f7b01a1SEric Dumazet { 13388f7b01a1SEric Dumazet struct netfront_info *np = netdev_priv(dev); 13398f7b01a1SEric Dumazet 13402890ea5cSJuergen Gross if (features & NETIF_F_SG && 13412890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) 13428f7b01a1SEric Dumazet features &= ~NETIF_F_SG; 13438f7b01a1SEric Dumazet 13442890ea5cSJuergen Gross if (features & NETIF_F_IPV6_CSUM && 13452890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, 13462890ea5cSJuergen Gross "feature-ipv6-csum-offload", 0)) 13472c0057deSPaul Durrant features &= ~NETIF_F_IPV6_CSUM; 13482c0057deSPaul Durrant 13492890ea5cSJuergen Gross if (features & NETIF_F_TSO && 13502890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) 13518f7b01a1SEric Dumazet features &= ~NETIF_F_TSO; 13528f7b01a1SEric Dumazet 13532890ea5cSJuergen Gross if (features & NETIF_F_TSO6 && 13542890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) 13552c0057deSPaul Durrant features &= ~NETIF_F_TSO6; 13562c0057deSPaul Durrant 13578f7b01a1SEric Dumazet return features; 13588f7b01a1SEric Dumazet } 13598f7b01a1SEric Dumazet 1360c8f44affSMichał Mirosław static int xennet_set_features(struct net_device *dev, 1361c8f44affSMichał Mirosław netdev_features_t features) 13628f7b01a1SEric Dumazet { 13638f7b01a1SEric Dumazet if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { 13648f7b01a1SEric Dumazet netdev_info(dev, "Reducing MTU because no SG offload"); 13658f7b01a1SEric Dumazet dev->mtu = ETH_DATA_LEN; 13668f7b01a1SEric Dumazet } 13678f7b01a1SEric Dumazet 13688f7b01a1SEric Dumazet return 0; 13698f7b01a1SEric Dumazet } 13708f7b01a1SEric Dumazet 1371d634bf2cSWei Liu static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) 1372cf66f9d4SKonrad Rzeszutek Wilk { 13732688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 1374cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 1375cf66f9d4SKonrad Rzeszutek Wilk 13762688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 13772688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 13782688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 1379cf66f9d4SKonrad Rzeszutek Wilk 1380cf66f9d4SKonrad Rzeszutek Wilk return IRQ_HANDLED; 1381cf66f9d4SKonrad Rzeszutek Wilk } 1382cf66f9d4SKonrad Rzeszutek Wilk 1383d634bf2cSWei Liu static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) 1384d634bf2cSWei Liu { 13852688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 13862688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 1387d634bf2cSWei Liu 1388d634bf2cSWei Liu if (likely(netif_carrier_ok(dev) && 13892688fcb7SAndrew J. Bennieston RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) 13902688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 1391d634bf2cSWei Liu 1392d634bf2cSWei Liu return IRQ_HANDLED; 1393d634bf2cSWei Liu } 1394d634bf2cSWei Liu 1395d634bf2cSWei Liu static irqreturn_t xennet_interrupt(int irq, void *dev_id) 1396d634bf2cSWei Liu { 1397d634bf2cSWei Liu xennet_tx_interrupt(irq, dev_id); 1398d634bf2cSWei Liu xennet_rx_interrupt(irq, dev_id); 1399d634bf2cSWei Liu return IRQ_HANDLED; 1400d634bf2cSWei Liu } 1401d634bf2cSWei Liu 1402cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1403cf66f9d4SKonrad Rzeszutek Wilk static void xennet_poll_controller(struct net_device *dev) 1404cf66f9d4SKonrad Rzeszutek Wilk { 14052688fcb7SAndrew J. Bennieston /* Poll each queue */ 14062688fcb7SAndrew J. Bennieston struct netfront_info *info = netdev_priv(dev); 14072688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 14082688fcb7SAndrew J. Bennieston unsigned int i; 14092688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) 14102688fcb7SAndrew J. Bennieston xennet_interrupt(0, &info->queues[i]); 1411cf66f9d4SKonrad Rzeszutek Wilk } 1412cf66f9d4SKonrad Rzeszutek Wilk #endif 1413cf66f9d4SKonrad Rzeszutek Wilk 14146c5aa6fcSDenis Kirjanov #define NETBACK_XDP_HEADROOM_DISABLE 0 14156c5aa6fcSDenis Kirjanov #define NETBACK_XDP_HEADROOM_ENABLE 1 14166c5aa6fcSDenis Kirjanov 14176c5aa6fcSDenis Kirjanov static int talk_to_netback_xdp(struct netfront_info *np, int xdp) 14186c5aa6fcSDenis Kirjanov { 14196c5aa6fcSDenis Kirjanov int err; 14206c5aa6fcSDenis Kirjanov unsigned short headroom; 14216c5aa6fcSDenis Kirjanov 14226c5aa6fcSDenis Kirjanov headroom = xdp ? XDP_PACKET_HEADROOM : 0; 14236c5aa6fcSDenis Kirjanov err = xenbus_printf(XBT_NIL, np->xbdev->nodename, 14246c5aa6fcSDenis Kirjanov "xdp-headroom", "%hu", 14256c5aa6fcSDenis Kirjanov headroom); 14266c5aa6fcSDenis Kirjanov if (err) 14276c5aa6fcSDenis Kirjanov pr_warn("Error writing xdp-headroom\n"); 14286c5aa6fcSDenis Kirjanov 14296c5aa6fcSDenis Kirjanov return err; 14306c5aa6fcSDenis Kirjanov } 14316c5aa6fcSDenis Kirjanov 14326c5aa6fcSDenis Kirjanov static int xennet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 14336c5aa6fcSDenis Kirjanov struct netlink_ext_ack *extack) 14346c5aa6fcSDenis Kirjanov { 14356c5aa6fcSDenis Kirjanov unsigned long max_mtu = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM; 14366c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 14376c5aa6fcSDenis Kirjanov struct bpf_prog *old_prog; 14386c5aa6fcSDenis Kirjanov unsigned int i, err; 14396c5aa6fcSDenis Kirjanov 14406c5aa6fcSDenis Kirjanov if (dev->mtu > max_mtu) { 14416c5aa6fcSDenis Kirjanov netdev_warn(dev, "XDP requires MTU less than %lu\n", max_mtu); 14426c5aa6fcSDenis Kirjanov return -EINVAL; 14436c5aa6fcSDenis Kirjanov } 14446c5aa6fcSDenis Kirjanov 14456c5aa6fcSDenis Kirjanov if (!np->netback_has_xdp_headroom) 14466c5aa6fcSDenis Kirjanov return 0; 14476c5aa6fcSDenis Kirjanov 14486c5aa6fcSDenis Kirjanov xenbus_switch_state(np->xbdev, XenbusStateReconfiguring); 14496c5aa6fcSDenis Kirjanov 14506c5aa6fcSDenis Kirjanov err = talk_to_netback_xdp(np, prog ? NETBACK_XDP_HEADROOM_ENABLE : 14516c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_DISABLE); 14526c5aa6fcSDenis Kirjanov if (err) 14536c5aa6fcSDenis Kirjanov return err; 14546c5aa6fcSDenis Kirjanov 14556c5aa6fcSDenis Kirjanov /* avoid the race with XDP headroom adjustment */ 14566c5aa6fcSDenis Kirjanov wait_event(module_wq, 14576c5aa6fcSDenis Kirjanov xenbus_read_driver_state(np->xbdev->otherend) == 14586c5aa6fcSDenis Kirjanov XenbusStateReconfigured); 14596c5aa6fcSDenis Kirjanov np->netfront_xdp_enabled = true; 14606c5aa6fcSDenis Kirjanov 14616c5aa6fcSDenis Kirjanov old_prog = rtnl_dereference(np->queues[0].xdp_prog); 14626c5aa6fcSDenis Kirjanov 14636c5aa6fcSDenis Kirjanov if (prog) 14646c5aa6fcSDenis Kirjanov bpf_prog_add(prog, dev->real_num_tx_queues); 14656c5aa6fcSDenis Kirjanov 14666c5aa6fcSDenis Kirjanov for (i = 0; i < dev->real_num_tx_queues; ++i) 14676c5aa6fcSDenis Kirjanov rcu_assign_pointer(np->queues[i].xdp_prog, prog); 14686c5aa6fcSDenis Kirjanov 14696c5aa6fcSDenis Kirjanov if (old_prog) 14706c5aa6fcSDenis Kirjanov for (i = 0; i < dev->real_num_tx_queues; ++i) 14716c5aa6fcSDenis Kirjanov bpf_prog_put(old_prog); 14726c5aa6fcSDenis Kirjanov 14736c5aa6fcSDenis Kirjanov xenbus_switch_state(np->xbdev, XenbusStateConnected); 14746c5aa6fcSDenis Kirjanov 14756c5aa6fcSDenis Kirjanov return 0; 14766c5aa6fcSDenis Kirjanov } 14776c5aa6fcSDenis Kirjanov 14786c5aa6fcSDenis Kirjanov static u32 xennet_xdp_query(struct net_device *dev) 14796c5aa6fcSDenis Kirjanov { 14806c5aa6fcSDenis Kirjanov unsigned int num_queues = dev->real_num_tx_queues; 14816c5aa6fcSDenis Kirjanov struct netfront_info *np = netdev_priv(dev); 14826c5aa6fcSDenis Kirjanov const struct bpf_prog *xdp_prog; 14836c5aa6fcSDenis Kirjanov struct netfront_queue *queue; 14846c5aa6fcSDenis Kirjanov unsigned int i; 14856c5aa6fcSDenis Kirjanov 14866c5aa6fcSDenis Kirjanov for (i = 0; i < num_queues; ++i) { 14876c5aa6fcSDenis Kirjanov queue = &np->queues[i]; 14886c5aa6fcSDenis Kirjanov xdp_prog = rtnl_dereference(queue->xdp_prog); 14896c5aa6fcSDenis Kirjanov if (xdp_prog) 14906c5aa6fcSDenis Kirjanov return xdp_prog->aux->id; 14916c5aa6fcSDenis Kirjanov } 14926c5aa6fcSDenis Kirjanov 14936c5aa6fcSDenis Kirjanov return 0; 14946c5aa6fcSDenis Kirjanov } 14956c5aa6fcSDenis Kirjanov 14966c5aa6fcSDenis Kirjanov static int xennet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 14976c5aa6fcSDenis Kirjanov { 14986c5aa6fcSDenis Kirjanov switch (xdp->command) { 14996c5aa6fcSDenis Kirjanov case XDP_SETUP_PROG: 15006c5aa6fcSDenis Kirjanov return xennet_xdp_set(dev, xdp->prog, xdp->extack); 15016c5aa6fcSDenis Kirjanov case XDP_QUERY_PROG: 15026c5aa6fcSDenis Kirjanov xdp->prog_id = xennet_xdp_query(dev); 15036c5aa6fcSDenis Kirjanov return 0; 15046c5aa6fcSDenis Kirjanov default: 15056c5aa6fcSDenis Kirjanov return -EINVAL; 15066c5aa6fcSDenis Kirjanov } 15076c5aa6fcSDenis Kirjanov } 15086c5aa6fcSDenis Kirjanov 15090a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 15100a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 15110a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 15120a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 15130a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 1514e00f85beSstephen hemminger .ndo_get_stats64 = xennet_get_stats64, 15150a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 15160a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 1517fb507934SMichał Mirosław .ndo_fix_features = xennet_fix_features, 1518fb507934SMichał Mirosław .ndo_set_features = xennet_set_features, 15192688fcb7SAndrew J. Bennieston .ndo_select_queue = xennet_select_queue, 15206c5aa6fcSDenis Kirjanov .ndo_bpf = xennet_xdp, 15216c5aa6fcSDenis Kirjanov .ndo_xdp_xmit = xennet_xdp_xmit, 1522cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1523cf66f9d4SKonrad Rzeszutek Wilk .ndo_poll_controller = xennet_poll_controller, 1524cf66f9d4SKonrad Rzeszutek Wilk #endif 15250a0b9d2eSStephen Hemminger }; 15260a0b9d2eSStephen Hemminger 1527900e1833SDavid Vrabel static void xennet_free_netdev(struct net_device *netdev) 1528900e1833SDavid Vrabel { 1529900e1833SDavid Vrabel struct netfront_info *np = netdev_priv(netdev); 1530900e1833SDavid Vrabel 1531900e1833SDavid Vrabel free_percpu(np->rx_stats); 1532900e1833SDavid Vrabel free_percpu(np->tx_stats); 1533900e1833SDavid Vrabel free_netdev(netdev); 1534900e1833SDavid Vrabel } 1535900e1833SDavid Vrabel 15368e0e46bbSBill Pemberton static struct net_device *xennet_create_dev(struct xenbus_device *dev) 15370d160211SJeremy Fitzhardinge { 15382688fcb7SAndrew J. Bennieston int err; 15390d160211SJeremy Fitzhardinge struct net_device *netdev; 15400d160211SJeremy Fitzhardinge struct netfront_info *np; 15410d160211SJeremy Fitzhardinge 154250ee6061SAndrew J. Bennieston netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); 154341de8d4cSJoe Perches if (!netdev) 15440d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 15450d160211SJeremy Fitzhardinge 15460d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 15470d160211SJeremy Fitzhardinge np->xbdev = dev; 15480d160211SJeremy Fitzhardinge 15492688fcb7SAndrew J. Bennieston np->queues = NULL; 15500d160211SJeremy Fitzhardinge 1551e00f85beSstephen hemminger err = -ENOMEM; 1552900e1833SDavid Vrabel np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1553900e1833SDavid Vrabel if (np->rx_stats == NULL) 1554900e1833SDavid Vrabel goto exit; 1555900e1833SDavid Vrabel np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1556900e1833SDavid Vrabel if (np->tx_stats == NULL) 1557e00f85beSstephen hemminger goto exit; 1558e00f85beSstephen hemminger 15590a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 15600a0b9d2eSStephen Hemminger 1561fb507934SMichał Mirosław netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | 1562fb507934SMichał Mirosław NETIF_F_GSO_ROBUST; 15632c0057deSPaul Durrant netdev->hw_features = NETIF_F_SG | 15642c0057deSPaul Durrant NETIF_F_IPV6_CSUM | 15652c0057deSPaul Durrant NETIF_F_TSO | NETIF_F_TSO6; 15660d160211SJeremy Fitzhardinge 1567fc3e5941SIan Campbell /* 1568fc3e5941SIan Campbell * Assume that all hw features are available for now. This set 1569fc3e5941SIan Campbell * will be adjusted by the call to netdev_update_features() in 1570fc3e5941SIan Campbell * xennet_connect() which is the earliest point where we can 1571fc3e5941SIan Campbell * negotiate with the backend regarding supported features. 1572fc3e5941SIan Campbell */ 1573fc3e5941SIan Campbell netdev->features |= netdev->hw_features; 1574fc3e5941SIan Campbell 15757ad24ea4SWilfried Klaebe netdev->ethtool_ops = &xennet_ethtool_ops; 1576e1043a4bSMohammed Gamal netdev->min_mtu = ETH_MIN_MTU; 1577d0c2c997SJarod Wilson netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; 15780d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 15790d160211SJeremy Fitzhardinge 15800d160211SJeremy Fitzhardinge np->netdev = netdev; 15816c5aa6fcSDenis Kirjanov np->netfront_xdp_enabled = false; 15820d160211SJeremy Fitzhardinge 15830d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 15840d160211SJeremy Fitzhardinge 1585b707fda2SEduardo Otubo xenbus_switch_state(dev, XenbusStateInitialising); 15868edfe2e9SJuergen Gross wait_event(module_wq, 1587822fb18aSXiao Liang xenbus_read_driver_state(dev->otherend) != 1588822fb18aSXiao Liang XenbusStateClosed && 1589822fb18aSXiao Liang xenbus_read_driver_state(dev->otherend) != 1590822fb18aSXiao Liang XenbusStateUnknown); 15910d160211SJeremy Fitzhardinge return netdev; 15920d160211SJeremy Fitzhardinge 15930d160211SJeremy Fitzhardinge exit: 1594900e1833SDavid Vrabel xennet_free_netdev(netdev); 15950d160211SJeremy Fitzhardinge return ERR_PTR(err); 15960d160211SJeremy Fitzhardinge } 15970d160211SJeremy Fitzhardinge 15980d160211SJeremy Fitzhardinge /** 15990d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 16000d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 16010d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 16020d160211SJeremy Fitzhardinge */ 16038e0e46bbSBill Pemberton static int netfront_probe(struct xenbus_device *dev, 16040d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 16050d160211SJeremy Fitzhardinge { 16060d160211SJeremy Fitzhardinge int err; 16070d160211SJeremy Fitzhardinge struct net_device *netdev; 16080d160211SJeremy Fitzhardinge struct netfront_info *info; 16090d160211SJeremy Fitzhardinge 16100d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 16110d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 16120d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 16130d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 16140d160211SJeremy Fitzhardinge return err; 16150d160211SJeremy Fitzhardinge } 16160d160211SJeremy Fitzhardinge 16170d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 16181b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 161927b917e5STakashi Iwai #ifdef CONFIG_SYSFS 162027b917e5STakashi Iwai info->netdev->sysfs_groups[0] = &xennet_dev_group; 162127b917e5STakashi Iwai #endif 16220d160211SJeremy Fitzhardinge 16230d160211SJeremy Fitzhardinge return 0; 16240d160211SJeremy Fitzhardinge } 16250d160211SJeremy Fitzhardinge 16260d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 16270d160211SJeremy Fitzhardinge { 16280d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 16290d160211SJeremy Fitzhardinge if (ref != GRANT_INVALID_REF) 16300d160211SJeremy Fitzhardinge gnttab_end_foreign_access(ref, 0, (unsigned long)page); 16310d160211SJeremy Fitzhardinge } 16320d160211SJeremy Fitzhardinge 16330d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 16340d160211SJeremy Fitzhardinge { 16352688fcb7SAndrew J. Bennieston unsigned int i = 0; 16362688fcb7SAndrew J. Bennieston unsigned int num_queues = info->netdev->real_num_tx_queues; 16370d160211SJeremy Fitzhardinge 1638f9feb1e6SDavid Vrabel netif_carrier_off(info->netdev); 1639f9feb1e6SDavid Vrabel 16409a873c71SChas Williams for (i = 0; i < num_queues && info->queues; ++i) { 164176541869SDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 164276541869SDavid Vrabel 164374470954SBoris Ostrovsky del_timer_sync(&queue->rx_refill_timer); 164474470954SBoris Ostrovsky 16452688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) 16462688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 16472688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { 16482688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 16492688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->rx_irq, queue); 1650d634bf2cSWei Liu } 16512688fcb7SAndrew J. Bennieston queue->tx_evtchn = queue->rx_evtchn = 0; 16522688fcb7SAndrew J. Bennieston queue->tx_irq = queue->rx_irq = 0; 16530d160211SJeremy Fitzhardinge 1654274b0455SChas Williams if (netif_running(info->netdev)) 1655f9feb1e6SDavid Vrabel napi_synchronize(&queue->napi); 1656f9feb1e6SDavid Vrabel 1657a5b5dc3cSDavid Vrabel xennet_release_tx_bufs(queue); 1658a5b5dc3cSDavid Vrabel xennet_release_rx_bufs(queue); 1659a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_tx_head); 1660a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_rx_head); 1661a5b5dc3cSDavid Vrabel 16620d160211SJeremy Fitzhardinge /* End access and free the pages */ 16632688fcb7SAndrew J. Bennieston xennet_end_access(queue->tx_ring_ref, queue->tx.sring); 16642688fcb7SAndrew J. Bennieston xennet_end_access(queue->rx_ring_ref, queue->rx.sring); 16650d160211SJeremy Fitzhardinge 16662688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 16672688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 16682688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 16692688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 16706c5aa6fcSDenis Kirjanov 16716c5aa6fcSDenis Kirjanov page_pool_destroy(queue->page_pool); 16722688fcb7SAndrew J. Bennieston } 16730d160211SJeremy Fitzhardinge } 16740d160211SJeremy Fitzhardinge 16750d160211SJeremy Fitzhardinge /** 16760d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 16770d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 16780d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 16790d160211SJeremy Fitzhardinge * rest of the kernel. 16800d160211SJeremy Fitzhardinge */ 16810d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 16820d160211SJeremy Fitzhardinge { 16831b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 16840d160211SJeremy Fitzhardinge 16850d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 16860d160211SJeremy Fitzhardinge 16870d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 16880d160211SJeremy Fitzhardinge return 0; 16890d160211SJeremy Fitzhardinge } 16900d160211SJeremy Fitzhardinge 16910d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 16920d160211SJeremy Fitzhardinge { 16930d160211SJeremy Fitzhardinge char *s, *e, *macstr; 16940d160211SJeremy Fitzhardinge int i; 16950d160211SJeremy Fitzhardinge 16960d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 16970d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 16980d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 16990d160211SJeremy Fitzhardinge 17000d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 17010d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 17020d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 17030d160211SJeremy Fitzhardinge kfree(macstr); 17040d160211SJeremy Fitzhardinge return -ENOENT; 17050d160211SJeremy Fitzhardinge } 17060d160211SJeremy Fitzhardinge s = e+1; 17070d160211SJeremy Fitzhardinge } 17080d160211SJeremy Fitzhardinge 17090d160211SJeremy Fitzhardinge kfree(macstr); 17100d160211SJeremy Fitzhardinge return 0; 17110d160211SJeremy Fitzhardinge } 17120d160211SJeremy Fitzhardinge 17132688fcb7SAndrew J. Bennieston static int setup_netfront_single(struct netfront_queue *queue) 1714d634bf2cSWei Liu { 1715d634bf2cSWei Liu int err; 1716d634bf2cSWei Liu 17172688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1718d634bf2cSWei Liu if (err < 0) 1719d634bf2cSWei Liu goto fail; 1720d634bf2cSWei Liu 17212688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1722d634bf2cSWei Liu xennet_interrupt, 17232688fcb7SAndrew J. Bennieston 0, queue->info->netdev->name, queue); 1724d634bf2cSWei Liu if (err < 0) 1725d634bf2cSWei Liu goto bind_fail; 17262688fcb7SAndrew J. Bennieston queue->rx_evtchn = queue->tx_evtchn; 17272688fcb7SAndrew J. Bennieston queue->rx_irq = queue->tx_irq = err; 1728d634bf2cSWei Liu 1729d634bf2cSWei Liu return 0; 1730d634bf2cSWei Liu 1731d634bf2cSWei Liu bind_fail: 17322688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 17332688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1734d634bf2cSWei Liu fail: 1735d634bf2cSWei Liu return err; 1736d634bf2cSWei Liu } 1737d634bf2cSWei Liu 17382688fcb7SAndrew J. Bennieston static int setup_netfront_split(struct netfront_queue *queue) 1739d634bf2cSWei Liu { 1740d634bf2cSWei Liu int err; 1741d634bf2cSWei Liu 17422688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1743d634bf2cSWei Liu if (err < 0) 1744d634bf2cSWei Liu goto fail; 17452688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); 1746d634bf2cSWei Liu if (err < 0) 1747d634bf2cSWei Liu goto alloc_rx_evtchn_fail; 1748d634bf2cSWei Liu 17492688fcb7SAndrew J. Bennieston snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 17502688fcb7SAndrew J. Bennieston "%s-tx", queue->name); 17512688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1752d634bf2cSWei Liu xennet_tx_interrupt, 17532688fcb7SAndrew J. Bennieston 0, queue->tx_irq_name, queue); 1754d634bf2cSWei Liu if (err < 0) 1755d634bf2cSWei Liu goto bind_tx_fail; 17562688fcb7SAndrew J. Bennieston queue->tx_irq = err; 1757d634bf2cSWei Liu 17582688fcb7SAndrew J. Bennieston snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 17592688fcb7SAndrew J. Bennieston "%s-rx", queue->name); 17602688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->rx_evtchn, 1761d634bf2cSWei Liu xennet_rx_interrupt, 17622688fcb7SAndrew J. Bennieston 0, queue->rx_irq_name, queue); 1763d634bf2cSWei Liu if (err < 0) 1764d634bf2cSWei Liu goto bind_rx_fail; 17652688fcb7SAndrew J. Bennieston queue->rx_irq = err; 1766d634bf2cSWei Liu 1767d634bf2cSWei Liu return 0; 1768d634bf2cSWei Liu 1769d634bf2cSWei Liu bind_rx_fail: 17702688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 17712688fcb7SAndrew J. Bennieston queue->tx_irq = 0; 1772d634bf2cSWei Liu bind_tx_fail: 17732688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); 17742688fcb7SAndrew J. Bennieston queue->rx_evtchn = 0; 1775d634bf2cSWei Liu alloc_rx_evtchn_fail: 17762688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 17772688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1778d634bf2cSWei Liu fail: 1779d634bf2cSWei Liu return err; 1780d634bf2cSWei Liu } 1781d634bf2cSWei Liu 17822688fcb7SAndrew J. Bennieston static int setup_netfront(struct xenbus_device *dev, 17832688fcb7SAndrew J. Bennieston struct netfront_queue *queue, unsigned int feature_split_evtchn) 17840d160211SJeremy Fitzhardinge { 17850d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 17860d160211SJeremy Fitzhardinge struct xen_netif_rx_sring *rxs; 1787ccc9d90aSWei Liu grant_ref_t gref; 17880d160211SJeremy Fitzhardinge int err; 17890d160211SJeremy Fitzhardinge 17902688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 17912688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 17922688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 17932688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 17940d160211SJeremy Fitzhardinge 1795a144ff09SIan Campbell txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 17960d160211SJeremy Fitzhardinge if (!txs) { 17970d160211SJeremy Fitzhardinge err = -ENOMEM; 17980d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating tx ring page"); 17990d160211SJeremy Fitzhardinge goto fail; 18000d160211SJeremy Fitzhardinge } 18010d160211SJeremy Fitzhardinge SHARED_RING_INIT(txs); 180230c5d7f0SJulien Grall FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); 18030d160211SJeremy Fitzhardinge 1804ccc9d90aSWei Liu err = xenbus_grant_ring(dev, txs, 1, &gref); 18051ca2983aSWei Liu if (err < 0) 18061ca2983aSWei Liu goto grant_tx_ring_fail; 1807ccc9d90aSWei Liu queue->tx_ring_ref = gref; 18080d160211SJeremy Fitzhardinge 1809a144ff09SIan Campbell rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 18100d160211SJeremy Fitzhardinge if (!rxs) { 18110d160211SJeremy Fitzhardinge err = -ENOMEM; 18120d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating rx ring page"); 18131ca2983aSWei Liu goto alloc_rx_ring_fail; 18140d160211SJeremy Fitzhardinge } 18150d160211SJeremy Fitzhardinge SHARED_RING_INIT(rxs); 181630c5d7f0SJulien Grall FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); 18170d160211SJeremy Fitzhardinge 1818ccc9d90aSWei Liu err = xenbus_grant_ring(dev, rxs, 1, &gref); 18191ca2983aSWei Liu if (err < 0) 18201ca2983aSWei Liu goto grant_rx_ring_fail; 1821ccc9d90aSWei Liu queue->rx_ring_ref = gref; 18220d160211SJeremy Fitzhardinge 1823d634bf2cSWei Liu if (feature_split_evtchn) 18242688fcb7SAndrew J. Bennieston err = setup_netfront_split(queue); 1825d634bf2cSWei Liu /* setup single event channel if 1826d634bf2cSWei Liu * a) feature-split-event-channels == 0 1827d634bf2cSWei Liu * b) feature-split-event-channels == 1 but failed to setup 1828d634bf2cSWei Liu */ 1829d634bf2cSWei Liu if (!feature_split_evtchn || (feature_split_evtchn && err)) 18302688fcb7SAndrew J. Bennieston err = setup_netfront_single(queue); 1831d634bf2cSWei Liu 18320d160211SJeremy Fitzhardinge if (err) 18331ca2983aSWei Liu goto alloc_evtchn_fail; 18340d160211SJeremy Fitzhardinge 18350d160211SJeremy Fitzhardinge return 0; 18360d160211SJeremy Fitzhardinge 18371ca2983aSWei Liu /* If we fail to setup netfront, it is safe to just revoke access to 18381ca2983aSWei Liu * granted pages because backend is not accessing it at this point. 18391ca2983aSWei Liu */ 18401ca2983aSWei Liu alloc_evtchn_fail: 18412688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); 18421ca2983aSWei Liu grant_rx_ring_fail: 18431ca2983aSWei Liu free_page((unsigned long)rxs); 18441ca2983aSWei Liu alloc_rx_ring_fail: 18452688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); 18461ca2983aSWei Liu grant_tx_ring_fail: 18471ca2983aSWei Liu free_page((unsigned long)txs); 18480d160211SJeremy Fitzhardinge fail: 18490d160211SJeremy Fitzhardinge return err; 18500d160211SJeremy Fitzhardinge } 18510d160211SJeremy Fitzhardinge 18522688fcb7SAndrew J. Bennieston /* Queue-specific initialisation 18532688fcb7SAndrew J. Bennieston * This used to be done in xennet_create_dev() but must now 18542688fcb7SAndrew J. Bennieston * be run per-queue. 18552688fcb7SAndrew J. Bennieston */ 18562688fcb7SAndrew J. Bennieston static int xennet_init_queue(struct netfront_queue *queue) 18572688fcb7SAndrew J. Bennieston { 18582688fcb7SAndrew J. Bennieston unsigned short i; 18592688fcb7SAndrew J. Bennieston int err = 0; 186021f2706bSXiao Liang char *devid; 18612688fcb7SAndrew J. Bennieston 18622688fcb7SAndrew J. Bennieston spin_lock_init(&queue->tx_lock); 18632688fcb7SAndrew J. Bennieston spin_lock_init(&queue->rx_lock); 18642688fcb7SAndrew J. Bennieston 1865e99e88a9SKees Cook timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0); 18662688fcb7SAndrew J. Bennieston 186721f2706bSXiao Liang devid = strrchr(queue->info->xbdev->nodename, '/') + 1; 186821f2706bSXiao Liang snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", 186921f2706bSXiao Liang devid, queue->id); 18708b715010SWei Liu 18712688fcb7SAndrew J. Bennieston /* Initialise tx_skbs as a free chain containing every entry. */ 18722688fcb7SAndrew J. Bennieston queue->tx_skb_freelist = 0; 18732688fcb7SAndrew J. Bennieston for (i = 0; i < NET_TX_RING_SIZE; i++) { 18742688fcb7SAndrew J. Bennieston skb_entry_set_link(&queue->tx_skbs[i], i+1); 18752688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 18762688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 18772688fcb7SAndrew J. Bennieston } 18782688fcb7SAndrew J. Bennieston 18792688fcb7SAndrew J. Bennieston /* Clear out rx_skbs */ 18802688fcb7SAndrew J. Bennieston for (i = 0; i < NET_RX_RING_SIZE; i++) { 18812688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 18822688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 18832688fcb7SAndrew J. Bennieston } 18842688fcb7SAndrew J. Bennieston 18852688fcb7SAndrew J. Bennieston /* A grant for every tx ring slot */ 18861f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, 18872688fcb7SAndrew J. Bennieston &queue->gref_tx_head) < 0) { 18882688fcb7SAndrew J. Bennieston pr_alert("can't alloc tx grant refs\n"); 18892688fcb7SAndrew J. Bennieston err = -ENOMEM; 18902688fcb7SAndrew J. Bennieston goto exit; 18912688fcb7SAndrew J. Bennieston } 18922688fcb7SAndrew J. Bennieston 18932688fcb7SAndrew J. Bennieston /* A grant for every rx ring slot */ 18941f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, 18952688fcb7SAndrew J. Bennieston &queue->gref_rx_head) < 0) { 18962688fcb7SAndrew J. Bennieston pr_alert("can't alloc rx grant refs\n"); 18972688fcb7SAndrew J. Bennieston err = -ENOMEM; 18982688fcb7SAndrew J. Bennieston goto exit_free_tx; 18992688fcb7SAndrew J. Bennieston } 19002688fcb7SAndrew J. Bennieston 19012688fcb7SAndrew J. Bennieston return 0; 19022688fcb7SAndrew J. Bennieston 19032688fcb7SAndrew J. Bennieston exit_free_tx: 19042688fcb7SAndrew J. Bennieston gnttab_free_grant_references(queue->gref_tx_head); 19052688fcb7SAndrew J. Bennieston exit: 19062688fcb7SAndrew J. Bennieston return err; 19072688fcb7SAndrew J. Bennieston } 19082688fcb7SAndrew J. Bennieston 190950ee6061SAndrew J. Bennieston static int write_queue_xenstore_keys(struct netfront_queue *queue, 191050ee6061SAndrew J. Bennieston struct xenbus_transaction *xbt, int write_hierarchical) 191150ee6061SAndrew J. Bennieston { 191250ee6061SAndrew J. Bennieston /* Write the queue-specific keys into XenStore in the traditional 191350ee6061SAndrew J. Bennieston * way for a single queue, or in a queue subkeys for multiple 191450ee6061SAndrew J. Bennieston * queues. 191550ee6061SAndrew J. Bennieston */ 191650ee6061SAndrew J. Bennieston struct xenbus_device *dev = queue->info->xbdev; 191750ee6061SAndrew J. Bennieston int err; 191850ee6061SAndrew J. Bennieston const char *message; 191950ee6061SAndrew J. Bennieston char *path; 192050ee6061SAndrew J. Bennieston size_t pathsize; 192150ee6061SAndrew J. Bennieston 192250ee6061SAndrew J. Bennieston /* Choose the correct place to write the keys */ 192350ee6061SAndrew J. Bennieston if (write_hierarchical) { 192450ee6061SAndrew J. Bennieston pathsize = strlen(dev->nodename) + 10; 192550ee6061SAndrew J. Bennieston path = kzalloc(pathsize, GFP_KERNEL); 192650ee6061SAndrew J. Bennieston if (!path) { 192750ee6061SAndrew J. Bennieston err = -ENOMEM; 192850ee6061SAndrew J. Bennieston message = "out of memory while writing ring references"; 192950ee6061SAndrew J. Bennieston goto error; 193050ee6061SAndrew J. Bennieston } 193150ee6061SAndrew J. Bennieston snprintf(path, pathsize, "%s/queue-%u", 193250ee6061SAndrew J. Bennieston dev->nodename, queue->id); 193350ee6061SAndrew J. Bennieston } else { 193450ee6061SAndrew J. Bennieston path = (char *)dev->nodename; 193550ee6061SAndrew J. Bennieston } 193650ee6061SAndrew J. Bennieston 193750ee6061SAndrew J. Bennieston /* Write ring references */ 193850ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", 193950ee6061SAndrew J. Bennieston queue->tx_ring_ref); 194050ee6061SAndrew J. Bennieston if (err) { 194150ee6061SAndrew J. Bennieston message = "writing tx-ring-ref"; 194250ee6061SAndrew J. Bennieston goto error; 194350ee6061SAndrew J. Bennieston } 194450ee6061SAndrew J. Bennieston 194550ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", 194650ee6061SAndrew J. Bennieston queue->rx_ring_ref); 194750ee6061SAndrew J. Bennieston if (err) { 194850ee6061SAndrew J. Bennieston message = "writing rx-ring-ref"; 194950ee6061SAndrew J. Bennieston goto error; 195050ee6061SAndrew J. Bennieston } 195150ee6061SAndrew J. Bennieston 195250ee6061SAndrew J. Bennieston /* Write event channels; taking into account both shared 195350ee6061SAndrew J. Bennieston * and split event channel scenarios. 195450ee6061SAndrew J. Bennieston */ 195550ee6061SAndrew J. Bennieston if (queue->tx_evtchn == queue->rx_evtchn) { 195650ee6061SAndrew J. Bennieston /* Shared event channel */ 195750ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 195850ee6061SAndrew J. Bennieston "event-channel", "%u", queue->tx_evtchn); 195950ee6061SAndrew J. Bennieston if (err) { 196050ee6061SAndrew J. Bennieston message = "writing event-channel"; 196150ee6061SAndrew J. Bennieston goto error; 196250ee6061SAndrew J. Bennieston } 196350ee6061SAndrew J. Bennieston } else { 196450ee6061SAndrew J. Bennieston /* Split event channels */ 196550ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 196650ee6061SAndrew J. Bennieston "event-channel-tx", "%u", queue->tx_evtchn); 196750ee6061SAndrew J. Bennieston if (err) { 196850ee6061SAndrew J. Bennieston message = "writing event-channel-tx"; 196950ee6061SAndrew J. Bennieston goto error; 197050ee6061SAndrew J. Bennieston } 197150ee6061SAndrew J. Bennieston 197250ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 197350ee6061SAndrew J. Bennieston "event-channel-rx", "%u", queue->rx_evtchn); 197450ee6061SAndrew J. Bennieston if (err) { 197550ee6061SAndrew J. Bennieston message = "writing event-channel-rx"; 197650ee6061SAndrew J. Bennieston goto error; 197750ee6061SAndrew J. Bennieston } 197850ee6061SAndrew J. Bennieston } 197950ee6061SAndrew J. Bennieston 198050ee6061SAndrew J. Bennieston if (write_hierarchical) 198150ee6061SAndrew J. Bennieston kfree(path); 198250ee6061SAndrew J. Bennieston return 0; 198350ee6061SAndrew J. Bennieston 198450ee6061SAndrew J. Bennieston error: 198550ee6061SAndrew J. Bennieston if (write_hierarchical) 198650ee6061SAndrew J. Bennieston kfree(path); 198750ee6061SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "%s", message); 198850ee6061SAndrew J. Bennieston return err; 198950ee6061SAndrew J. Bennieston } 199050ee6061SAndrew J. Bennieston 1991ce58725fSDavid Vrabel static void xennet_destroy_queues(struct netfront_info *info) 1992ce58725fSDavid Vrabel { 1993ce58725fSDavid Vrabel unsigned int i; 1994ce58725fSDavid Vrabel 1995ce58725fSDavid Vrabel for (i = 0; i < info->netdev->real_num_tx_queues; i++) { 1996ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 1997ce58725fSDavid Vrabel 1998ce58725fSDavid Vrabel if (netif_running(info->netdev)) 1999ce58725fSDavid Vrabel napi_disable(&queue->napi); 2000ce58725fSDavid Vrabel netif_napi_del(&queue->napi); 2001ce58725fSDavid Vrabel } 2002ce58725fSDavid Vrabel 2003ce58725fSDavid Vrabel kfree(info->queues); 2004ce58725fSDavid Vrabel info->queues = NULL; 2005ce58725fSDavid Vrabel } 2006ce58725fSDavid Vrabel 20076c5aa6fcSDenis Kirjanov 20086c5aa6fcSDenis Kirjanov 20096c5aa6fcSDenis Kirjanov static int xennet_create_page_pool(struct netfront_queue *queue) 20106c5aa6fcSDenis Kirjanov { 20116c5aa6fcSDenis Kirjanov int err; 20126c5aa6fcSDenis Kirjanov struct page_pool_params pp_params = { 20136c5aa6fcSDenis Kirjanov .order = 0, 20146c5aa6fcSDenis Kirjanov .flags = 0, 20156c5aa6fcSDenis Kirjanov .pool_size = NET_RX_RING_SIZE, 20166c5aa6fcSDenis Kirjanov .nid = NUMA_NO_NODE, 20176c5aa6fcSDenis Kirjanov .dev = &queue->info->netdev->dev, 20186c5aa6fcSDenis Kirjanov .offset = XDP_PACKET_HEADROOM, 20196c5aa6fcSDenis Kirjanov .max_len = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, 20206c5aa6fcSDenis Kirjanov }; 20216c5aa6fcSDenis Kirjanov 20226c5aa6fcSDenis Kirjanov queue->page_pool = page_pool_create(&pp_params); 20236c5aa6fcSDenis Kirjanov if (IS_ERR(queue->page_pool)) { 20246c5aa6fcSDenis Kirjanov err = PTR_ERR(queue->page_pool); 20256c5aa6fcSDenis Kirjanov queue->page_pool = NULL; 20266c5aa6fcSDenis Kirjanov return err; 20276c5aa6fcSDenis Kirjanov } 20286c5aa6fcSDenis Kirjanov 20296c5aa6fcSDenis Kirjanov err = xdp_rxq_info_reg(&queue->xdp_rxq, queue->info->netdev, 20306c5aa6fcSDenis Kirjanov queue->id); 20316c5aa6fcSDenis Kirjanov if (err) { 20326c5aa6fcSDenis Kirjanov netdev_err(queue->info->netdev, "xdp_rxq_info_reg failed\n"); 20336c5aa6fcSDenis Kirjanov goto err_free_pp; 20346c5aa6fcSDenis Kirjanov } 20356c5aa6fcSDenis Kirjanov 20366c5aa6fcSDenis Kirjanov err = xdp_rxq_info_reg_mem_model(&queue->xdp_rxq, 20376c5aa6fcSDenis Kirjanov MEM_TYPE_PAGE_POOL, queue->page_pool); 20386c5aa6fcSDenis Kirjanov if (err) { 20396c5aa6fcSDenis Kirjanov netdev_err(queue->info->netdev, "xdp_rxq_info_reg_mem_model failed\n"); 20406c5aa6fcSDenis Kirjanov goto err_unregister_rxq; 20416c5aa6fcSDenis Kirjanov } 20426c5aa6fcSDenis Kirjanov return 0; 20436c5aa6fcSDenis Kirjanov 20446c5aa6fcSDenis Kirjanov err_unregister_rxq: 20456c5aa6fcSDenis Kirjanov xdp_rxq_info_unreg(&queue->xdp_rxq); 20466c5aa6fcSDenis Kirjanov err_free_pp: 20476c5aa6fcSDenis Kirjanov page_pool_destroy(queue->page_pool); 20486c5aa6fcSDenis Kirjanov queue->page_pool = NULL; 20496c5aa6fcSDenis Kirjanov return err; 20506c5aa6fcSDenis Kirjanov } 20516c5aa6fcSDenis Kirjanov 2052ce58725fSDavid Vrabel static int xennet_create_queues(struct netfront_info *info, 2053ca88ea12SJoe Jin unsigned int *num_queues) 2054ce58725fSDavid Vrabel { 2055ce58725fSDavid Vrabel unsigned int i; 2056ce58725fSDavid Vrabel int ret; 2057ce58725fSDavid Vrabel 2058ca88ea12SJoe Jin info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), 2059ce58725fSDavid Vrabel GFP_KERNEL); 2060ce58725fSDavid Vrabel if (!info->queues) 2061ce58725fSDavid Vrabel return -ENOMEM; 2062ce58725fSDavid Vrabel 2063ca88ea12SJoe Jin for (i = 0; i < *num_queues; i++) { 2064ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 2065ce58725fSDavid Vrabel 2066ce58725fSDavid Vrabel queue->id = i; 2067ce58725fSDavid Vrabel queue->info = info; 2068ce58725fSDavid Vrabel 2069ce58725fSDavid Vrabel ret = xennet_init_queue(queue); 2070ce58725fSDavid Vrabel if (ret < 0) { 2071f599c64fSRoss Lagerwall dev_warn(&info->xbdev->dev, 207269cb8524SDavid Vrabel "only created %d queues\n", i); 2073ca88ea12SJoe Jin *num_queues = i; 2074ce58725fSDavid Vrabel break; 2075ce58725fSDavid Vrabel } 2076ce58725fSDavid Vrabel 20776c5aa6fcSDenis Kirjanov /* use page pool recycling instead of buddy allocator */ 20786c5aa6fcSDenis Kirjanov ret = xennet_create_page_pool(queue); 20796c5aa6fcSDenis Kirjanov if (ret < 0) { 20806c5aa6fcSDenis Kirjanov dev_err(&info->xbdev->dev, "can't allocate page pool\n"); 20816c5aa6fcSDenis Kirjanov *num_queues = i; 20826c5aa6fcSDenis Kirjanov return ret; 20836c5aa6fcSDenis Kirjanov } 20846c5aa6fcSDenis Kirjanov 2085ce58725fSDavid Vrabel netif_napi_add(queue->info->netdev, &queue->napi, 2086ce58725fSDavid Vrabel xennet_poll, 64); 2087ce58725fSDavid Vrabel if (netif_running(info->netdev)) 2088ce58725fSDavid Vrabel napi_enable(&queue->napi); 2089ce58725fSDavid Vrabel } 2090ce58725fSDavid Vrabel 2091ca88ea12SJoe Jin netif_set_real_num_tx_queues(info->netdev, *num_queues); 2092ce58725fSDavid Vrabel 2093ca88ea12SJoe Jin if (*num_queues == 0) { 2094f599c64fSRoss Lagerwall dev_err(&info->xbdev->dev, "no queues\n"); 2095ce58725fSDavid Vrabel return -EINVAL; 2096ce58725fSDavid Vrabel } 2097ce58725fSDavid Vrabel return 0; 2098ce58725fSDavid Vrabel } 2099ce58725fSDavid Vrabel 21000d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 2101f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 21020d160211SJeremy Fitzhardinge struct netfront_info *info) 21030d160211SJeremy Fitzhardinge { 21040d160211SJeremy Fitzhardinge const char *message; 21050d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 21060d160211SJeremy Fitzhardinge int err; 21072688fcb7SAndrew J. Bennieston unsigned int feature_split_evtchn; 21082688fcb7SAndrew J. Bennieston unsigned int i = 0; 210950ee6061SAndrew J. Bennieston unsigned int max_queues = 0; 21102688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 21112688fcb7SAndrew J. Bennieston unsigned int num_queues = 1; 21120d160211SJeremy Fitzhardinge 21132688fcb7SAndrew J. Bennieston info->netdev->irq = 0; 21142688fcb7SAndrew J. Bennieston 211550ee6061SAndrew J. Bennieston /* Check if backend supports multiple queues */ 21162890ea5cSJuergen Gross max_queues = xenbus_read_unsigned(info->xbdev->otherend, 21172890ea5cSJuergen Gross "multi-queue-max-queues", 1); 211850ee6061SAndrew J. Bennieston num_queues = min(max_queues, xennet_max_queues); 211950ee6061SAndrew J. Bennieston 21202688fcb7SAndrew J. Bennieston /* Check feature-split-event-channels */ 21212890ea5cSJuergen Gross feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, 21222890ea5cSJuergen Gross "feature-split-event-channels", 0); 21232688fcb7SAndrew J. Bennieston 21242688fcb7SAndrew J. Bennieston /* Read mac addr. */ 21252688fcb7SAndrew J. Bennieston err = xen_net_read_mac(dev, info->netdev->dev_addr); 21262688fcb7SAndrew J. Bennieston if (err) { 21272688fcb7SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 2128cb257783SRoss Lagerwall goto out_unlocked; 21292688fcb7SAndrew J. Bennieston } 21302688fcb7SAndrew J. Bennieston 21316c5aa6fcSDenis Kirjanov info->netback_has_xdp_headroom = xenbus_read_unsigned(info->xbdev->otherend, 21326c5aa6fcSDenis Kirjanov "feature-xdp-headroom", 0); 21336c5aa6fcSDenis Kirjanov if (info->netback_has_xdp_headroom) { 21346c5aa6fcSDenis Kirjanov /* set the current xen-netfront xdp state */ 21356c5aa6fcSDenis Kirjanov err = talk_to_netback_xdp(info, info->netfront_xdp_enabled ? 21366c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_ENABLE : 21376c5aa6fcSDenis Kirjanov NETBACK_XDP_HEADROOM_DISABLE); 21386c5aa6fcSDenis Kirjanov if (err) 21396c5aa6fcSDenis Kirjanov goto out_unlocked; 21406c5aa6fcSDenis Kirjanov } 21416c5aa6fcSDenis Kirjanov 2142f599c64fSRoss Lagerwall rtnl_lock(); 2143ce58725fSDavid Vrabel if (info->queues) 2144ce58725fSDavid Vrabel xennet_destroy_queues(info); 2145ce58725fSDavid Vrabel 2146ca88ea12SJoe Jin err = xennet_create_queues(info, &num_queues); 2147e2e004acSRoss Lagerwall if (err < 0) { 2148e2e004acSRoss Lagerwall xenbus_dev_fatal(dev, err, "creating queues"); 2149e2e004acSRoss Lagerwall kfree(info->queues); 2150e2e004acSRoss Lagerwall info->queues = NULL; 2151e2e004acSRoss Lagerwall goto out; 2152e2e004acSRoss Lagerwall } 2153f599c64fSRoss Lagerwall rtnl_unlock(); 21542688fcb7SAndrew J. Bennieston 21552688fcb7SAndrew J. Bennieston /* Create shared ring, alloc event channel -- for each queue */ 21562688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 21572688fcb7SAndrew J. Bennieston queue = &info->queues[i]; 21582688fcb7SAndrew J. Bennieston err = setup_netfront(dev, queue, feature_split_evtchn); 2159e2e004acSRoss Lagerwall if (err) 21602688fcb7SAndrew J. Bennieston goto destroy_ring; 21612688fcb7SAndrew J. Bennieston } 21620d160211SJeremy Fitzhardinge 21630d160211SJeremy Fitzhardinge again: 21640d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 21650d160211SJeremy Fitzhardinge if (err) { 21660d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 21670d160211SJeremy Fitzhardinge goto destroy_ring; 21680d160211SJeremy Fitzhardinge } 21690d160211SJeremy Fitzhardinge 2170812494d9Schas williams if (xenbus_exists(XBT_NIL, 2171812494d9Schas williams info->xbdev->otherend, "multi-queue-max-queues")) { 2172812494d9Schas williams /* Write the number of queues */ 2173812494d9Schas williams err = xenbus_printf(xbt, dev->nodename, 2174812494d9Schas williams "multi-queue-num-queues", "%u", num_queues); 2175812494d9Schas williams if (err) { 2176812494d9Schas williams message = "writing multi-queue-num-queues"; 2177812494d9Schas williams goto abort_transaction_no_dev_fatal; 2178812494d9Schas williams } 2179812494d9Schas williams } 2180812494d9Schas williams 218150ee6061SAndrew J. Bennieston if (num_queues == 1) { 218250ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ 218350ee6061SAndrew J. Bennieston if (err) 218450ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 2185d634bf2cSWei Liu } else { 218650ee6061SAndrew J. Bennieston /* Write the keys for each queue */ 218750ee6061SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 218850ee6061SAndrew J. Bennieston queue = &info->queues[i]; 218950ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ 219050ee6061SAndrew J. Bennieston if (err) 219150ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 2192d634bf2cSWei Liu } 2193d634bf2cSWei Liu } 21940d160211SJeremy Fitzhardinge 219550ee6061SAndrew J. Bennieston /* The remaining keys are not queue-specific */ 21960d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 21970d160211SJeremy Fitzhardinge 1); 21980d160211SJeremy Fitzhardinge if (err) { 21990d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 22000d160211SJeremy Fitzhardinge goto abort_transaction; 22010d160211SJeremy Fitzhardinge } 22020d160211SJeremy Fitzhardinge 22030d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 22040d160211SJeremy Fitzhardinge if (err) { 22050d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 22060d160211SJeremy Fitzhardinge goto abort_transaction; 22070d160211SJeremy Fitzhardinge } 22080d160211SJeremy Fitzhardinge 22090d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 22100d160211SJeremy Fitzhardinge if (err) { 22110d160211SJeremy Fitzhardinge message = "writing feature-sg"; 22120d160211SJeremy Fitzhardinge goto abort_transaction; 22130d160211SJeremy Fitzhardinge } 22140d160211SJeremy Fitzhardinge 22150d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 22160d160211SJeremy Fitzhardinge if (err) { 22170d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 22180d160211SJeremy Fitzhardinge goto abort_transaction; 22190d160211SJeremy Fitzhardinge } 22200d160211SJeremy Fitzhardinge 22212c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); 22222c0057deSPaul Durrant if (err) { 22232c0057deSPaul Durrant message = "writing feature-gso-tcpv6"; 22242c0057deSPaul Durrant goto abort_transaction; 22252c0057deSPaul Durrant } 22262c0057deSPaul Durrant 22272c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", 22282c0057deSPaul Durrant "1"); 22292c0057deSPaul Durrant if (err) { 22302c0057deSPaul Durrant message = "writing feature-ipv6-csum-offload"; 22312c0057deSPaul Durrant goto abort_transaction; 22322c0057deSPaul Durrant } 22332c0057deSPaul Durrant 22340d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 22350d160211SJeremy Fitzhardinge if (err) { 22360d160211SJeremy Fitzhardinge if (err == -EAGAIN) 22370d160211SJeremy Fitzhardinge goto again; 22380d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 22390d160211SJeremy Fitzhardinge goto destroy_ring; 22400d160211SJeremy Fitzhardinge } 22410d160211SJeremy Fitzhardinge 22420d160211SJeremy Fitzhardinge return 0; 22430d160211SJeremy Fitzhardinge 22440d160211SJeremy Fitzhardinge abort_transaction: 22450d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 224650ee6061SAndrew J. Bennieston abort_transaction_no_dev_fatal: 224750ee6061SAndrew J. Bennieston xenbus_transaction_end(xbt, 1); 22480d160211SJeremy Fitzhardinge destroy_ring: 22490d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 2250f599c64fSRoss Lagerwall rtnl_lock(); 2251e2e004acSRoss Lagerwall xennet_destroy_queues(info); 22520d160211SJeremy Fitzhardinge out: 2253f599c64fSRoss Lagerwall rtnl_unlock(); 2254cb257783SRoss Lagerwall out_unlocked: 2255d86b5672SVitaly Kuznetsov device_unregister(&dev->dev); 22560d160211SJeremy Fitzhardinge return err; 22570d160211SJeremy Fitzhardinge } 22580d160211SJeremy Fitzhardinge 22590d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 22600d160211SJeremy Fitzhardinge { 22610d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 22622688fcb7SAndrew J. Bennieston unsigned int num_queues = 0; 2263a5b5dc3cSDavid Vrabel int err; 22642688fcb7SAndrew J. Bennieston unsigned int j = 0; 22652688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 22660d160211SJeremy Fitzhardinge 22672890ea5cSJuergen Gross if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { 22680d160211SJeremy Fitzhardinge dev_info(&dev->dev, 2269898eb71cSJoe Perches "backend does not support copying receive path\n"); 22700d160211SJeremy Fitzhardinge return -ENODEV; 22710d160211SJeremy Fitzhardinge } 22720d160211SJeremy Fitzhardinge 2273f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 22740d160211SJeremy Fitzhardinge if (err) 22750d160211SJeremy Fitzhardinge return err; 22766c5aa6fcSDenis Kirjanov if (np->netback_has_xdp_headroom) 22776c5aa6fcSDenis Kirjanov pr_info("backend supports XDP headroom\n"); 22780d160211SJeremy Fitzhardinge 22792688fcb7SAndrew J. Bennieston /* talk_to_netback() sets the correct number of queues */ 22802688fcb7SAndrew J. Bennieston num_queues = dev->real_num_tx_queues; 22812688fcb7SAndrew J. Bennieston 2282f599c64fSRoss Lagerwall if (dev->reg_state == NETREG_UNINITIALIZED) { 2283f599c64fSRoss Lagerwall err = register_netdev(dev); 2284f599c64fSRoss Lagerwall if (err) { 2285f599c64fSRoss Lagerwall pr_warn("%s: register_netdev err=%d\n", __func__, err); 2286f599c64fSRoss Lagerwall device_unregister(&np->xbdev->dev); 2287f599c64fSRoss Lagerwall return err; 2288f599c64fSRoss Lagerwall } 2289f599c64fSRoss Lagerwall } 2290f599c64fSRoss Lagerwall 229145c8184cSRoss Lagerwall rtnl_lock(); 229245c8184cSRoss Lagerwall netdev_update_features(dev); 229345c8184cSRoss Lagerwall rtnl_unlock(); 229445c8184cSRoss Lagerwall 22950d160211SJeremy Fitzhardinge /* 2296a5b5dc3cSDavid Vrabel * All public and private state should now be sane. Get 22970d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 22980d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 22990d160211SJeremy Fitzhardinge * packets. 23000d160211SJeremy Fitzhardinge */ 23010d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 23022688fcb7SAndrew J. Bennieston for (j = 0; j < num_queues; ++j) { 23032688fcb7SAndrew J. Bennieston queue = &np->queues[j]; 2304f50b4076SDavid Vrabel 23052688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 23062688fcb7SAndrew J. Bennieston if (queue->tx_irq != queue->rx_irq) 23072688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 23080d160211SJeremy Fitzhardinge 2309f50b4076SDavid Vrabel spin_lock_irq(&queue->tx_lock); 2310f50b4076SDavid Vrabel xennet_tx_buf_gc(queue); 23112688fcb7SAndrew J. Bennieston spin_unlock_irq(&queue->tx_lock); 2312f50b4076SDavid Vrabel 2313f50b4076SDavid Vrabel spin_lock_bh(&queue->rx_lock); 2314f50b4076SDavid Vrabel xennet_alloc_rx_buffers(queue); 23152688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 23162688fcb7SAndrew J. Bennieston } 23170d160211SJeremy Fitzhardinge 23180d160211SJeremy Fitzhardinge return 0; 23190d160211SJeremy Fitzhardinge } 23200d160211SJeremy Fitzhardinge 23210d160211SJeremy Fitzhardinge /** 23220d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 23230d160211SJeremy Fitzhardinge */ 2324f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 23250d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 23260d160211SJeremy Fitzhardinge { 23271b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 23280d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 23290d160211SJeremy Fitzhardinge 23300d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 23310d160211SJeremy Fitzhardinge 23328edfe2e9SJuergen Gross wake_up_all(&module_wq); 23338edfe2e9SJuergen Gross 23340d160211SJeremy Fitzhardinge switch (backend_state) { 23350d160211SJeremy Fitzhardinge case XenbusStateInitialising: 23360d160211SJeremy Fitzhardinge case XenbusStateInitialised: 2337b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 2338b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 23390d160211SJeremy Fitzhardinge case XenbusStateUnknown: 23400d160211SJeremy Fitzhardinge break; 23410d160211SJeremy Fitzhardinge 23420d160211SJeremy Fitzhardinge case XenbusStateInitWait: 23430d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 23440d160211SJeremy Fitzhardinge break; 23450d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 23460d160211SJeremy Fitzhardinge break; 23470d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 234808e34eb1SLaszlo Ersek break; 234908e34eb1SLaszlo Ersek 235008e34eb1SLaszlo Ersek case XenbusStateConnected: 2351ee89bab1SAmerigo Wang netdev_notify_peers(netdev); 23520d160211SJeremy Fitzhardinge break; 23530d160211SJeremy Fitzhardinge 2354bce3ea81SDavid Vrabel case XenbusStateClosed: 2355bce3ea81SDavid Vrabel if (dev->state == XenbusStateClosed) 2356bce3ea81SDavid Vrabel break; 2357a32b9d91SGustavo A. R. Silva /* Fall through - Missed the backend's CLOSING state. */ 23580d160211SJeremy Fitzhardinge case XenbusStateClosing: 23590d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 23600d160211SJeremy Fitzhardinge break; 23610d160211SJeremy Fitzhardinge } 23620d160211SJeremy Fitzhardinge } 23630d160211SJeremy Fitzhardinge 2364e0ce4af9SIan Campbell static const struct xennet_stat { 2365e0ce4af9SIan Campbell char name[ETH_GSTRING_LEN]; 2366e0ce4af9SIan Campbell u16 offset; 2367e0ce4af9SIan Campbell } xennet_stats[] = { 2368e0ce4af9SIan Campbell { 2369e0ce4af9SIan Campbell "rx_gso_checksum_fixup", 2370e0ce4af9SIan Campbell offsetof(struct netfront_info, rx_gso_checksum_fixup) 2371e0ce4af9SIan Campbell }, 2372e0ce4af9SIan Campbell }; 2373e0ce4af9SIan Campbell 2374e0ce4af9SIan Campbell static int xennet_get_sset_count(struct net_device *dev, int string_set) 2375e0ce4af9SIan Campbell { 2376e0ce4af9SIan Campbell switch (string_set) { 2377e0ce4af9SIan Campbell case ETH_SS_STATS: 2378e0ce4af9SIan Campbell return ARRAY_SIZE(xennet_stats); 2379e0ce4af9SIan Campbell default: 2380e0ce4af9SIan Campbell return -EINVAL; 2381e0ce4af9SIan Campbell } 2382e0ce4af9SIan Campbell } 2383e0ce4af9SIan Campbell 2384e0ce4af9SIan Campbell static void xennet_get_ethtool_stats(struct net_device *dev, 2385e0ce4af9SIan Campbell struct ethtool_stats *stats, u64 * data) 2386e0ce4af9SIan Campbell { 2387e0ce4af9SIan Campbell void *np = netdev_priv(dev); 2388e0ce4af9SIan Campbell int i; 2389e0ce4af9SIan Campbell 2390e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 23912688fcb7SAndrew J. Bennieston data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); 2392e0ce4af9SIan Campbell } 2393e0ce4af9SIan Campbell 2394e0ce4af9SIan Campbell static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) 2395e0ce4af9SIan Campbell { 2396e0ce4af9SIan Campbell int i; 2397e0ce4af9SIan Campbell 2398e0ce4af9SIan Campbell switch (stringset) { 2399e0ce4af9SIan Campbell case ETH_SS_STATS: 2400e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 2401e0ce4af9SIan Campbell memcpy(data + i * ETH_GSTRING_LEN, 2402e0ce4af9SIan Campbell xennet_stats[i].name, ETH_GSTRING_LEN); 2403e0ce4af9SIan Campbell break; 2404e0ce4af9SIan Campbell } 2405e0ce4af9SIan Campbell } 2406e0ce4af9SIan Campbell 24070fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 24080d160211SJeremy Fitzhardinge { 24090d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 2410e0ce4af9SIan Campbell 2411e0ce4af9SIan Campbell .get_sset_count = xennet_get_sset_count, 2412e0ce4af9SIan Campbell .get_ethtool_stats = xennet_get_ethtool_stats, 2413e0ce4af9SIan Campbell .get_strings = xennet_get_strings, 24140d160211SJeremy Fitzhardinge }; 24150d160211SJeremy Fitzhardinge 24160d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 24171f3c2ebaSDavid Vrabel static ssize_t show_rxbuf(struct device *dev, 24180d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 24190d160211SJeremy Fitzhardinge { 24201f3c2ebaSDavid Vrabel return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); 24210d160211SJeremy Fitzhardinge } 24220d160211SJeremy Fitzhardinge 24231f3c2ebaSDavid Vrabel static ssize_t store_rxbuf(struct device *dev, 24240d160211SJeremy Fitzhardinge struct device_attribute *attr, 24250d160211SJeremy Fitzhardinge const char *buf, size_t len) 24260d160211SJeremy Fitzhardinge { 24270d160211SJeremy Fitzhardinge char *endp; 24280d160211SJeremy Fitzhardinge unsigned long target; 24290d160211SJeremy Fitzhardinge 24300d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 24310d160211SJeremy Fitzhardinge return -EPERM; 24320d160211SJeremy Fitzhardinge 24330d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 24340d160211SJeremy Fitzhardinge if (endp == buf) 24350d160211SJeremy Fitzhardinge return -EBADMSG; 24360d160211SJeremy Fitzhardinge 24371f3c2ebaSDavid Vrabel /* rxbuf_min and rxbuf_max are no longer configurable. */ 24380d160211SJeremy Fitzhardinge 24390d160211SJeremy Fitzhardinge return len; 24400d160211SJeremy Fitzhardinge } 24410d160211SJeremy Fitzhardinge 2442d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf); 2443d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf); 2444d61e4038SJoe Perches static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL); 244527b917e5STakashi Iwai 244627b917e5STakashi Iwai static struct attribute *xennet_dev_attrs[] = { 244727b917e5STakashi Iwai &dev_attr_rxbuf_min.attr, 244827b917e5STakashi Iwai &dev_attr_rxbuf_max.attr, 244927b917e5STakashi Iwai &dev_attr_rxbuf_cur.attr, 245027b917e5STakashi Iwai NULL 24510d160211SJeremy Fitzhardinge }; 24520d160211SJeremy Fitzhardinge 245327b917e5STakashi Iwai static const struct attribute_group xennet_dev_group = { 245427b917e5STakashi Iwai .attrs = xennet_dev_attrs 245527b917e5STakashi Iwai }; 24560d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 24570d160211SJeremy Fitzhardinge 24588e0e46bbSBill Pemberton static int xennet_remove(struct xenbus_device *dev) 24590d160211SJeremy Fitzhardinge { 24601b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 24610d160211SJeremy Fitzhardinge 24620d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 24630d160211SJeremy Fitzhardinge 24645b5971dfSEduardo Otubo if (xenbus_read_driver_state(dev->otherend) != XenbusStateClosed) { 24655b5971dfSEduardo Otubo xenbus_switch_state(dev, XenbusStateClosing); 24668edfe2e9SJuergen Gross wait_event(module_wq, 24675b5971dfSEduardo Otubo xenbus_read_driver_state(dev->otherend) == 2468c2d2e673SJason Andryuk XenbusStateClosing || 2469c2d2e673SJason Andryuk xenbus_read_driver_state(dev->otherend) == 2470c2d2e673SJason Andryuk XenbusStateUnknown); 24715b5971dfSEduardo Otubo 24725b5971dfSEduardo Otubo xenbus_switch_state(dev, XenbusStateClosed); 24738edfe2e9SJuergen Gross wait_event(module_wq, 24745b5971dfSEduardo Otubo xenbus_read_driver_state(dev->otherend) == 24755b5971dfSEduardo Otubo XenbusStateClosed || 24765b5971dfSEduardo Otubo xenbus_read_driver_state(dev->otherend) == 24775b5971dfSEduardo Otubo XenbusStateUnknown); 24785b5971dfSEduardo Otubo } 24795b5971dfSEduardo Otubo 24800d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 24810d160211SJeremy Fitzhardinge 2482f599c64fSRoss Lagerwall if (info->netdev->reg_state == NETREG_REGISTERED) 24836bc96d04SIan Campbell unregister_netdev(info->netdev); 24846bc96d04SIan Campbell 2485f599c64fSRoss Lagerwall if (info->queues) { 2486f599c64fSRoss Lagerwall rtnl_lock(); 2487ad068118SDavid Vrabel xennet_destroy_queues(info); 2488f599c64fSRoss Lagerwall rtnl_unlock(); 2489f599c64fSRoss Lagerwall } 2490900e1833SDavid Vrabel xennet_free_netdev(info->netdev); 24910d160211SJeremy Fitzhardinge 24920d160211SJeremy Fitzhardinge return 0; 24930d160211SJeremy Fitzhardinge } 24940d160211SJeremy Fitzhardinge 249595afae48SDavid Vrabel static const struct xenbus_device_id netfront_ids[] = { 249695afae48SDavid Vrabel { "vif" }, 249795afae48SDavid Vrabel { "" } 249895afae48SDavid Vrabel }; 249995afae48SDavid Vrabel 250095afae48SDavid Vrabel static struct xenbus_driver netfront_driver = { 250195afae48SDavid Vrabel .ids = netfront_ids, 25020d160211SJeremy Fitzhardinge .probe = netfront_probe, 25038e0e46bbSBill Pemberton .remove = xennet_remove, 25040d160211SJeremy Fitzhardinge .resume = netfront_resume, 2505f502bf2bSIan Campbell .otherend_changed = netback_changed, 250695afae48SDavid Vrabel }; 25070d160211SJeremy Fitzhardinge 25080d160211SJeremy Fitzhardinge static int __init netif_init(void) 25090d160211SJeremy Fitzhardinge { 25106e833587SJeremy Fitzhardinge if (!xen_domain()) 25110d160211SJeremy Fitzhardinge return -ENODEV; 25120d160211SJeremy Fitzhardinge 251351c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_nic_devices()) 2514b9136d20SIgor Mammedov return -ENODEV; 2515b9136d20SIgor Mammedov 2516383eda32SJoe Perches pr_info("Initialising Xen virtual ethernet driver\n"); 25170d160211SJeremy Fitzhardinge 2518034702a6SJuergen Gross /* Allow as many queues as there are CPUs inut max. 8 if user has not 251932a84405SWei Liu * specified a value. 252032a84405SWei Liu */ 252132a84405SWei Liu if (xennet_max_queues == 0) 2522034702a6SJuergen Gross xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, 2523034702a6SJuergen Gross num_online_cpus()); 252450ee6061SAndrew J. Bennieston 2525ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 25260d160211SJeremy Fitzhardinge } 25270d160211SJeremy Fitzhardinge module_init(netif_init); 25280d160211SJeremy Fitzhardinge 25290d160211SJeremy Fitzhardinge 25300d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 25310d160211SJeremy Fitzhardinge { 2532ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 25330d160211SJeremy Fitzhardinge } 25340d160211SJeremy Fitzhardinge module_exit(netif_exit); 25350d160211SJeremy Fitzhardinge 25360d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 25370d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 2538d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 25394f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 2540