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> 470d160211SJeremy Fitzhardinge 481ccbf534SJeremy Fitzhardinge #include <xen/xen.h> 490d160211SJeremy Fitzhardinge #include <xen/xenbus.h> 500d160211SJeremy Fitzhardinge #include <xen/events.h> 510d160211SJeremy Fitzhardinge #include <xen/page.h> 52b9136d20SIgor Mammedov #include <xen/platform_pci.h> 530d160211SJeremy Fitzhardinge #include <xen/grant_table.h> 540d160211SJeremy Fitzhardinge 550d160211SJeremy Fitzhardinge #include <xen/interface/io/netif.h> 560d160211SJeremy Fitzhardinge #include <xen/interface/memory.h> 570d160211SJeremy Fitzhardinge #include <xen/interface/grant_table.h> 580d160211SJeremy Fitzhardinge 5950ee6061SAndrew J. Bennieston /* Module parameters */ 6050ee6061SAndrew J. Bennieston static unsigned int xennet_max_queues; 6150ee6061SAndrew J. Bennieston module_param_named(max_queues, xennet_max_queues, uint, 0644); 6250ee6061SAndrew J. Bennieston MODULE_PARM_DESC(max_queues, 6350ee6061SAndrew J. Bennieston "Maximum number of queues per virtual interface"); 6450ee6061SAndrew J. Bennieston 650fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 660d160211SJeremy Fitzhardinge 670d160211SJeremy Fitzhardinge struct netfront_cb { 683683243bSIan Campbell int pull_to; 690d160211SJeremy Fitzhardinge }; 700d160211SJeremy Fitzhardinge 710d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 720d160211SJeremy Fitzhardinge 730d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 740d160211SJeremy Fitzhardinge 750d160211SJeremy Fitzhardinge #define GRANT_INVALID_REF 0 760d160211SJeremy Fitzhardinge 7730c5d7f0SJulien Grall #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) 7830c5d7f0SJulien Grall #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) 791f3c2ebaSDavid Vrabel 801f3c2ebaSDavid Vrabel /* Minimum number of Rx slots (includes slot for GSO metadata). */ 811f3c2ebaSDavid Vrabel #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) 820d160211SJeremy Fitzhardinge 832688fcb7SAndrew J. Bennieston /* Queue name is interface name with "-qNNN" appended */ 842688fcb7SAndrew J. Bennieston #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) 852688fcb7SAndrew J. Bennieston 862688fcb7SAndrew J. Bennieston /* IRQ name is queue name with "-tx" or "-rx" appended */ 872688fcb7SAndrew J. Bennieston #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) 882688fcb7SAndrew J. Bennieston 89e00f85beSstephen hemminger struct netfront_stats { 90900e1833SDavid Vrabel u64 packets; 91900e1833SDavid Vrabel u64 bytes; 92e00f85beSstephen hemminger struct u64_stats_sync syncp; 93e00f85beSstephen hemminger }; 94e00f85beSstephen hemminger 952688fcb7SAndrew J. Bennieston struct netfront_info; 962688fcb7SAndrew J. Bennieston 972688fcb7SAndrew J. Bennieston struct netfront_queue { 982688fcb7SAndrew J. Bennieston unsigned int id; /* Queue ID, 0-based */ 992688fcb7SAndrew J. Bennieston char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ 1002688fcb7SAndrew J. Bennieston struct netfront_info *info; 1010d160211SJeremy Fitzhardinge 102bea3348eSStephen Hemminger struct napi_struct napi; 1030d160211SJeremy Fitzhardinge 104d634bf2cSWei Liu /* Split event channels support, tx_* == rx_* when using 105d634bf2cSWei Liu * single event channel. 106d634bf2cSWei Liu */ 107d634bf2cSWei Liu unsigned int tx_evtchn, rx_evtchn; 108d634bf2cSWei Liu unsigned int tx_irq, rx_irq; 109d634bf2cSWei Liu /* Only used when split event channels support is enabled */ 1102688fcb7SAndrew J. Bennieston char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ 1112688fcb7SAndrew J. Bennieston char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ 1120d160211SJeremy Fitzhardinge 1130d160211SJeremy Fitzhardinge spinlock_t tx_lock; 11484284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 11584284d3cSJeremy Fitzhardinge int tx_ring_ref; 1160d160211SJeremy Fitzhardinge 1170d160211SJeremy Fitzhardinge /* 1180d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 1190d160211SJeremy Fitzhardinge * are linked from tx_skb_freelist through skb_entry.link. 1200d160211SJeremy Fitzhardinge * 1210d160211SJeremy Fitzhardinge * NB. Freelist index entries are always going to be less than 1220d160211SJeremy Fitzhardinge * PAGE_OFFSET, whereas pointers to skbs will always be equal or 1230d160211SJeremy Fitzhardinge * greater than PAGE_OFFSET: we use this property to distinguish 1240d160211SJeremy Fitzhardinge * them. 1250d160211SJeremy Fitzhardinge */ 1260d160211SJeremy Fitzhardinge union skb_entry { 1270d160211SJeremy Fitzhardinge struct sk_buff *skb; 1281ffb40b8SIsaku Yamahata unsigned long link; 1290d160211SJeremy Fitzhardinge } tx_skbs[NET_TX_RING_SIZE]; 1300d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1310d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 132cefe0078SAnnie Li struct page *grant_tx_page[NET_TX_RING_SIZE]; 1330d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 1340d160211SJeremy Fitzhardinge 13584284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 13684284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 13784284d3cSJeremy Fitzhardinge int rx_ring_ref; 13884284d3cSJeremy Fitzhardinge 13984284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 14084284d3cSJeremy Fitzhardinge 1410d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1420d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1430d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1442688fcb7SAndrew J. Bennieston }; 1452688fcb7SAndrew J. Bennieston 1462688fcb7SAndrew J. Bennieston struct netfront_info { 1472688fcb7SAndrew J. Bennieston struct list_head list; 1482688fcb7SAndrew J. Bennieston struct net_device *netdev; 1492688fcb7SAndrew J. Bennieston 1502688fcb7SAndrew J. Bennieston struct xenbus_device *xbdev; 1512688fcb7SAndrew J. Bennieston 1522688fcb7SAndrew J. Bennieston /* Multi-queue support */ 1532688fcb7SAndrew J. Bennieston struct netfront_queue *queues; 154e0ce4af9SIan Campbell 155e0ce4af9SIan Campbell /* Statistics */ 156900e1833SDavid Vrabel struct netfront_stats __percpu *rx_stats; 157900e1833SDavid Vrabel struct netfront_stats __percpu *tx_stats; 158e00f85beSstephen hemminger 1592688fcb7SAndrew J. Bennieston atomic_t rx_gso_checksum_fixup; 1600d160211SJeremy Fitzhardinge }; 1610d160211SJeremy Fitzhardinge 1620d160211SJeremy Fitzhardinge struct netfront_rx_info { 1630d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1640d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1650d160211SJeremy Fitzhardinge }; 1660d160211SJeremy Fitzhardinge 1671ffb40b8SIsaku Yamahata static void skb_entry_set_link(union skb_entry *list, unsigned short id) 1681ffb40b8SIsaku Yamahata { 1691ffb40b8SIsaku Yamahata list->link = id; 1701ffb40b8SIsaku Yamahata } 1711ffb40b8SIsaku Yamahata 1721ffb40b8SIsaku Yamahata static int skb_entry_is_link(const union skb_entry *list) 1731ffb40b8SIsaku Yamahata { 1741ffb40b8SIsaku Yamahata BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); 175807540baSEric Dumazet return (unsigned long)list->skb < PAGE_OFFSET; 1761ffb40b8SIsaku Yamahata } 1771ffb40b8SIsaku Yamahata 1780d160211SJeremy Fitzhardinge /* 1790d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1800d160211SJeremy Fitzhardinge */ 1810d160211SJeremy Fitzhardinge 1820d160211SJeremy Fitzhardinge static void add_id_to_freelist(unsigned *head, union skb_entry *list, 1830d160211SJeremy Fitzhardinge unsigned short id) 1840d160211SJeremy Fitzhardinge { 1851ffb40b8SIsaku Yamahata skb_entry_set_link(&list[id], *head); 1860d160211SJeremy Fitzhardinge *head = id; 1870d160211SJeremy Fitzhardinge } 1880d160211SJeremy Fitzhardinge 1890d160211SJeremy Fitzhardinge static unsigned short get_id_from_freelist(unsigned *head, 1900d160211SJeremy Fitzhardinge union skb_entry *list) 1910d160211SJeremy Fitzhardinge { 1920d160211SJeremy Fitzhardinge unsigned int id = *head; 1930d160211SJeremy Fitzhardinge *head = list[id].link; 1940d160211SJeremy Fitzhardinge return id; 1950d160211SJeremy Fitzhardinge } 1960d160211SJeremy Fitzhardinge 1970d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 1980d160211SJeremy Fitzhardinge { 1990d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 2000d160211SJeremy Fitzhardinge } 2010d160211SJeremy Fitzhardinge 2022688fcb7SAndrew J. Bennieston static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, 2030d160211SJeremy Fitzhardinge RING_IDX ri) 2040d160211SJeremy Fitzhardinge { 2050d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2062688fcb7SAndrew J. Bennieston struct sk_buff *skb = queue->rx_skbs[i]; 2072688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 2080d160211SJeremy Fitzhardinge return skb; 2090d160211SJeremy Fitzhardinge } 2100d160211SJeremy Fitzhardinge 2112688fcb7SAndrew J. Bennieston static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, 2120d160211SJeremy Fitzhardinge RING_IDX ri) 2130d160211SJeremy Fitzhardinge { 2140d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2152688fcb7SAndrew J. Bennieston grant_ref_t ref = queue->grant_rx_ref[i]; 2162688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 2170d160211SJeremy Fitzhardinge return ref; 2180d160211SJeremy Fitzhardinge } 2190d160211SJeremy Fitzhardinge 2200d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 22127b917e5STakashi Iwai static const struct attribute_group xennet_dev_group; 2220d160211SJeremy Fitzhardinge #endif 2230d160211SJeremy Fitzhardinge 2243ad9b358SMichał Mirosław static bool xennet_can_sg(struct net_device *dev) 2250d160211SJeremy Fitzhardinge { 2263ad9b358SMichał Mirosław return dev->features & NETIF_F_SG; 2270d160211SJeremy Fitzhardinge } 2280d160211SJeremy Fitzhardinge 2290d160211SJeremy Fitzhardinge 2300d160211SJeremy Fitzhardinge static void rx_refill_timeout(unsigned long data) 2310d160211SJeremy Fitzhardinge { 2322688fcb7SAndrew J. Bennieston struct netfront_queue *queue = (struct netfront_queue *)data; 2332688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 2340d160211SJeremy Fitzhardinge } 2350d160211SJeremy Fitzhardinge 2362688fcb7SAndrew J. Bennieston static int netfront_tx_slot_available(struct netfront_queue *queue) 2370d160211SJeremy Fitzhardinge { 2382688fcb7SAndrew J. Bennieston return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < 2391f3c2ebaSDavid Vrabel (NET_TX_RING_SIZE - MAX_SKB_FRAGS - 2); 2400d160211SJeremy Fitzhardinge } 2410d160211SJeremy Fitzhardinge 2422688fcb7SAndrew J. Bennieston static void xennet_maybe_wake_tx(struct netfront_queue *queue) 2430d160211SJeremy Fitzhardinge { 2442688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 2452688fcb7SAndrew J. Bennieston struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); 2460d160211SJeremy Fitzhardinge 2472688fcb7SAndrew J. Bennieston if (unlikely(netif_tx_queue_stopped(dev_queue)) && 2482688fcb7SAndrew J. Bennieston netfront_tx_slot_available(queue) && 2490d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2502688fcb7SAndrew J. Bennieston netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); 2510d160211SJeremy Fitzhardinge } 2520d160211SJeremy Fitzhardinge 2531f3c2ebaSDavid Vrabel 2541f3c2ebaSDavid Vrabel static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) 2550d160211SJeremy Fitzhardinge { 2560d160211SJeremy Fitzhardinge struct sk_buff *skb; 2570d160211SJeremy Fitzhardinge struct page *page; 2580d160211SJeremy Fitzhardinge 2592688fcb7SAndrew J. Bennieston skb = __netdev_alloc_skb(queue->info->netdev, 2602688fcb7SAndrew J. Bennieston RX_COPY_THRESHOLD + NET_IP_ALIGN, 2610d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2620d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2631f3c2ebaSDavid Vrabel return NULL; 264617a20bbSIsaku Yamahata 2650d160211SJeremy Fitzhardinge page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); 2660d160211SJeremy Fitzhardinge if (!page) { 2670d160211SJeremy Fitzhardinge kfree_skb(skb); 2681f3c2ebaSDavid Vrabel return NULL; 2690d160211SJeremy Fitzhardinge } 270093b9c71SJan Beulich skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); 2710d160211SJeremy Fitzhardinge 2721f3c2ebaSDavid Vrabel /* Align ip header to a 16 bytes boundary */ 2731f3c2ebaSDavid Vrabel skb_reserve(skb, NET_IP_ALIGN); 2742688fcb7SAndrew J. Bennieston skb->dev = queue->info->netdev; 2750d160211SJeremy Fitzhardinge 2761f3c2ebaSDavid Vrabel return skb; 2771f3c2ebaSDavid Vrabel } 2781f3c2ebaSDavid Vrabel 2791f3c2ebaSDavid Vrabel 2801f3c2ebaSDavid Vrabel static void xennet_alloc_rx_buffers(struct netfront_queue *queue) 2811f3c2ebaSDavid Vrabel { 2821f3c2ebaSDavid Vrabel RING_IDX req_prod = queue->rx.req_prod_pvt; 2831f3c2ebaSDavid Vrabel int notify; 2841f3c2ebaSDavid Vrabel 2851f3c2ebaSDavid Vrabel if (unlikely(!netif_carrier_ok(queue->info->netdev))) 2861f3c2ebaSDavid Vrabel return; 2871f3c2ebaSDavid Vrabel 2881f3c2ebaSDavid Vrabel for (req_prod = queue->rx.req_prod_pvt; 2891f3c2ebaSDavid Vrabel req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; 2901f3c2ebaSDavid Vrabel req_prod++) { 2911f3c2ebaSDavid Vrabel struct sk_buff *skb; 2921f3c2ebaSDavid Vrabel unsigned short id; 2931f3c2ebaSDavid Vrabel grant_ref_t ref; 29430c5d7f0SJulien Grall struct page *page; 2951f3c2ebaSDavid Vrabel struct xen_netif_rx_request *req; 2961f3c2ebaSDavid Vrabel 2971f3c2ebaSDavid Vrabel skb = xennet_alloc_one_rx_buffer(queue); 2981f3c2ebaSDavid Vrabel if (!skb) 2991f3c2ebaSDavid Vrabel break; 3001f3c2ebaSDavid Vrabel 3011f3c2ebaSDavid Vrabel id = xennet_rxidx(req_prod); 3020d160211SJeremy Fitzhardinge 3032688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[id]); 3042688fcb7SAndrew J. Bennieston queue->rx_skbs[id] = skb; 3050d160211SJeremy Fitzhardinge 3062688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_rx_head); 307269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 3082688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = ref; 3090d160211SJeremy Fitzhardinge 31030c5d7f0SJulien Grall page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 3110d160211SJeremy Fitzhardinge 3121f3c2ebaSDavid Vrabel req = RING_GET_REQUEST(&queue->rx, req_prod); 31330c5d7f0SJulien Grall gnttab_page_grant_foreign_access_ref_one(ref, 3142688fcb7SAndrew J. Bennieston queue->info->xbdev->otherend_id, 31530c5d7f0SJulien Grall page, 3160d160211SJeremy Fitzhardinge 0); 3170d160211SJeremy Fitzhardinge req->id = id; 3180d160211SJeremy Fitzhardinge req->gref = ref; 3190d160211SJeremy Fitzhardinge } 3200d160211SJeremy Fitzhardinge 3211f3c2ebaSDavid Vrabel queue->rx.req_prod_pvt = req_prod; 3221f3c2ebaSDavid Vrabel 3231f3c2ebaSDavid Vrabel /* Not enough requests? Try again later. */ 32490c311b0SVineeth Remanan Pillai if (req_prod - queue->rx.sring->req_prod < NET_RX_SLOTS_MIN) { 3251f3c2ebaSDavid Vrabel mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); 3261f3c2ebaSDavid Vrabel return; 3271f3c2ebaSDavid Vrabel } 3281f3c2ebaSDavid Vrabel 3290d160211SJeremy Fitzhardinge wmb(); /* barrier so backend seens requests */ 3300d160211SJeremy Fitzhardinge 3312688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); 3320d160211SJeremy Fitzhardinge if (notify) 3332688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 3340d160211SJeremy Fitzhardinge } 3350d160211SJeremy Fitzhardinge 3360d160211SJeremy Fitzhardinge static int xennet_open(struct net_device *dev) 3370d160211SJeremy Fitzhardinge { 3380d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3392688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 3402688fcb7SAndrew J. Bennieston unsigned int i = 0; 3412688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 3420d160211SJeremy Fitzhardinge 3432688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 3442688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 3452688fcb7SAndrew J. Bennieston napi_enable(&queue->napi); 346bea3348eSStephen Hemminger 3472688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 3480d160211SJeremy Fitzhardinge if (netif_carrier_ok(dev)) { 3492688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 3502688fcb7SAndrew J. Bennieston queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; 3512688fcb7SAndrew J. Bennieston if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) 3522688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 3530d160211SJeremy Fitzhardinge } 3542688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 3552688fcb7SAndrew J. Bennieston } 3560d160211SJeremy Fitzhardinge 3572688fcb7SAndrew J. Bennieston netif_tx_start_all_queues(dev); 3580d160211SJeremy Fitzhardinge 3590d160211SJeremy Fitzhardinge return 0; 3600d160211SJeremy Fitzhardinge } 3610d160211SJeremy Fitzhardinge 3622688fcb7SAndrew J. Bennieston static void xennet_tx_buf_gc(struct netfront_queue *queue) 3630d160211SJeremy Fitzhardinge { 3640d160211SJeremy Fitzhardinge RING_IDX cons, prod; 3650d160211SJeremy Fitzhardinge unsigned short id; 3660d160211SJeremy Fitzhardinge struct sk_buff *skb; 3677d0105b5SMalcolm Crossley bool more_to_do; 3680d160211SJeremy Fitzhardinge 3692688fcb7SAndrew J. Bennieston BUG_ON(!netif_carrier_ok(queue->info->netdev)); 3700d160211SJeremy Fitzhardinge 3710d160211SJeremy Fitzhardinge do { 3722688fcb7SAndrew J. Bennieston prod = queue->tx.sring->rsp_prod; 3730d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 3740d160211SJeremy Fitzhardinge 3752688fcb7SAndrew J. Bennieston for (cons = queue->tx.rsp_cons; cons != prod; cons++) { 3760d160211SJeremy Fitzhardinge struct xen_netif_tx_response *txrsp; 3770d160211SJeremy Fitzhardinge 3782688fcb7SAndrew J. Bennieston txrsp = RING_GET_RESPONSE(&queue->tx, cons); 379f942dc25SIan Campbell if (txrsp->status == XEN_NETIF_RSP_NULL) 3800d160211SJeremy Fitzhardinge continue; 3810d160211SJeremy Fitzhardinge 3820d160211SJeremy Fitzhardinge id = txrsp->id; 3832688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[id].skb; 3840d160211SJeremy Fitzhardinge if (unlikely(gnttab_query_foreign_access( 3852688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id]) != 0)) { 386383eda32SJoe Perches pr_alert("%s: warning -- grant still in use by backend domain\n", 387383eda32SJoe Perches __func__); 3880d160211SJeremy Fitzhardinge BUG(); 3890d160211SJeremy Fitzhardinge } 3900d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref( 3912688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id], GNTMAP_readonly); 3920d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 3932688fcb7SAndrew J. Bennieston &queue->gref_tx_head, queue->grant_tx_ref[id]); 3942688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id] = GRANT_INVALID_REF; 3952688fcb7SAndrew J. Bennieston queue->grant_tx_page[id] = NULL; 3962688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id); 3970d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 3980d160211SJeremy Fitzhardinge } 3990d160211SJeremy Fitzhardinge 4002688fcb7SAndrew J. Bennieston queue->tx.rsp_cons = prod; 4010d160211SJeremy Fitzhardinge 4027d0105b5SMalcolm Crossley RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); 4037d0105b5SMalcolm Crossley } while (more_to_do); 4040d160211SJeremy Fitzhardinge 4052688fcb7SAndrew J. Bennieston xennet_maybe_wake_tx(queue); 4060d160211SJeremy Fitzhardinge } 4070d160211SJeremy Fitzhardinge 40830c5d7f0SJulien Grall struct xennet_gnttab_make_txreq { 40930c5d7f0SJulien Grall struct netfront_queue *queue; 41030c5d7f0SJulien Grall struct sk_buff *skb; 41130c5d7f0SJulien Grall struct page *page; 41230c5d7f0SJulien Grall struct xen_netif_tx_request *tx; /* Last request */ 41330c5d7f0SJulien Grall unsigned int size; 41430c5d7f0SJulien Grall }; 41530c5d7f0SJulien Grall 41630c5d7f0SJulien Grall static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, 41730c5d7f0SJulien Grall unsigned int len, void *data) 4180d160211SJeremy Fitzhardinge { 41930c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 4200d160211SJeremy Fitzhardinge unsigned int id; 421a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx; 4220d160211SJeremy Fitzhardinge grant_ref_t ref; 42330c5d7f0SJulien Grall /* convenient aliases */ 42430c5d7f0SJulien Grall struct page *page = info->page; 42530c5d7f0SJulien Grall struct netfront_queue *queue = info->queue; 42630c5d7f0SJulien Grall struct sk_buff *skb = info->skb; 4270d160211SJeremy Fitzhardinge 4282688fcb7SAndrew J. Bennieston id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); 429a55e8bb8SDavid Vrabel tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 4302688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_tx_head); 431269ebce4SDongli Zhang WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); 4320d160211SJeremy Fitzhardinge 43330c5d7f0SJulien Grall gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, 43430c5d7f0SJulien Grall gfn, GNTMAP_readonly); 4350d160211SJeremy Fitzhardinge 436a55e8bb8SDavid Vrabel queue->tx_skbs[id].skb = skb; 437a55e8bb8SDavid Vrabel queue->grant_tx_page[id] = page; 438a55e8bb8SDavid Vrabel queue->grant_tx_ref[id] = ref; 439a55e8bb8SDavid Vrabel 440a55e8bb8SDavid Vrabel tx->id = id; 441a55e8bb8SDavid Vrabel tx->gref = ref; 4420d160211SJeremy Fitzhardinge tx->offset = offset; 4430d160211SJeremy Fitzhardinge tx->size = len; 4440d160211SJeremy Fitzhardinge tx->flags = 0; 445a55e8bb8SDavid Vrabel 44630c5d7f0SJulien Grall info->tx = tx; 44730c5d7f0SJulien Grall info->size += tx->size; 44830c5d7f0SJulien Grall } 44930c5d7f0SJulien Grall 45030c5d7f0SJulien Grall static struct xen_netif_tx_request *xennet_make_first_txreq( 45130c5d7f0SJulien Grall struct netfront_queue *queue, struct sk_buff *skb, 45230c5d7f0SJulien Grall struct page *page, unsigned int offset, unsigned int len) 45330c5d7f0SJulien Grall { 45430c5d7f0SJulien Grall struct xennet_gnttab_make_txreq info = { 45530c5d7f0SJulien Grall .queue = queue, 45630c5d7f0SJulien Grall .skb = skb, 45730c5d7f0SJulien Grall .page = page, 45830c5d7f0SJulien Grall .size = 0, 45930c5d7f0SJulien Grall }; 46030c5d7f0SJulien Grall 46130c5d7f0SJulien Grall gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info); 46230c5d7f0SJulien Grall 46330c5d7f0SJulien Grall return info.tx; 46430c5d7f0SJulien Grall } 46530c5d7f0SJulien Grall 46630c5d7f0SJulien Grall static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, 46730c5d7f0SJulien Grall unsigned int len, void *data) 46830c5d7f0SJulien Grall { 46930c5d7f0SJulien Grall struct xennet_gnttab_make_txreq *info = data; 47030c5d7f0SJulien Grall 47130c5d7f0SJulien Grall info->tx->flags |= XEN_NETTXF_more_data; 47230c5d7f0SJulien Grall skb_get(info->skb); 47330c5d7f0SJulien Grall xennet_tx_setup_grant(gfn, offset, len, data); 4740d160211SJeremy Fitzhardinge } 4750d160211SJeremy Fitzhardinge 476a55e8bb8SDavid Vrabel static struct xen_netif_tx_request *xennet_make_txreqs( 477a55e8bb8SDavid Vrabel struct netfront_queue *queue, struct xen_netif_tx_request *tx, 478a55e8bb8SDavid Vrabel struct sk_buff *skb, struct page *page, 479a55e8bb8SDavid Vrabel unsigned int offset, unsigned int len) 480a55e8bb8SDavid Vrabel { 48130c5d7f0SJulien Grall struct xennet_gnttab_make_txreq info = { 48230c5d7f0SJulien Grall .queue = queue, 48330c5d7f0SJulien Grall .skb = skb, 48430c5d7f0SJulien Grall .tx = tx, 48530c5d7f0SJulien Grall }; 48630c5d7f0SJulien Grall 487f36c3747SIan Campbell /* Skip unused frames from start of page */ 488f36c3747SIan Campbell page += offset >> PAGE_SHIFT; 489f36c3747SIan Campbell offset &= ~PAGE_MASK; 490f36c3747SIan Campbell 491a55e8bb8SDavid Vrabel while (len) { 49230c5d7f0SJulien Grall info.page = page; 49330c5d7f0SJulien Grall info.size = 0; 49430c5d7f0SJulien Grall 49530c5d7f0SJulien Grall gnttab_foreach_grant_in_range(page, offset, len, 49630c5d7f0SJulien Grall xennet_make_one_txreq, 49730c5d7f0SJulien Grall &info); 49830c5d7f0SJulien Grall 499f36c3747SIan Campbell page++; 500f36c3747SIan Campbell offset = 0; 50130c5d7f0SJulien Grall len -= info.size; 5020d160211SJeremy Fitzhardinge } 5030d160211SJeremy Fitzhardinge 50430c5d7f0SJulien Grall return info.tx; 5050d160211SJeremy Fitzhardinge } 5060d160211SJeremy Fitzhardinge 507f36c3747SIan Campbell /* 508e84448d5SDavid Vrabel * Count how many ring slots are required to send this skb. Each frag 509e84448d5SDavid Vrabel * might be a compound page. 510f36c3747SIan Campbell */ 511e84448d5SDavid Vrabel static int xennet_count_skb_slots(struct sk_buff *skb) 512f36c3747SIan Campbell { 513f36c3747SIan Campbell int i, frags = skb_shinfo(skb)->nr_frags; 51430c5d7f0SJulien Grall int slots; 515e84448d5SDavid Vrabel 51630c5d7f0SJulien Grall slots = gnttab_count_grant(offset_in_page(skb->data), 51730c5d7f0SJulien Grall skb_headlen(skb)); 518f36c3747SIan Campbell 519f36c3747SIan Campbell for (i = 0; i < frags; i++) { 520f36c3747SIan Campbell skb_frag_t *frag = skb_shinfo(skb)->frags + i; 521f36c3747SIan Campbell unsigned long size = skb_frag_size(frag); 522f36c3747SIan Campbell unsigned long offset = frag->page_offset; 523f36c3747SIan Campbell 524f36c3747SIan Campbell /* Skip unused frames from start of page */ 525f36c3747SIan Campbell offset &= ~PAGE_MASK; 526f36c3747SIan Campbell 52730c5d7f0SJulien Grall slots += gnttab_count_grant(offset, size); 528f36c3747SIan Campbell } 529f36c3747SIan Campbell 53030c5d7f0SJulien Grall return slots; 531f36c3747SIan Campbell } 532f36c3747SIan Campbell 53350ee6061SAndrew J. Bennieston static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, 53450ee6061SAndrew J. Bennieston void *accel_priv, select_queue_fallback_t fallback) 5352688fcb7SAndrew J. Bennieston { 53650ee6061SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 53750ee6061SAndrew J. Bennieston u32 hash; 53850ee6061SAndrew J. Bennieston u16 queue_idx; 53950ee6061SAndrew J. Bennieston 54050ee6061SAndrew J. Bennieston /* First, check if there is only one queue */ 54150ee6061SAndrew J. Bennieston if (num_queues == 1) { 54250ee6061SAndrew J. Bennieston queue_idx = 0; 54350ee6061SAndrew J. Bennieston } else { 54450ee6061SAndrew J. Bennieston hash = skb_get_hash(skb); 54550ee6061SAndrew J. Bennieston queue_idx = hash % num_queues; 54650ee6061SAndrew J. Bennieston } 54750ee6061SAndrew J. Bennieston 54850ee6061SAndrew J. Bennieston return queue_idx; 5492688fcb7SAndrew J. Bennieston } 5502688fcb7SAndrew J. Bennieston 55130c5d7f0SJulien Grall #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) 55230c5d7f0SJulien Grall 5530d160211SJeremy Fitzhardinge static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 5540d160211SJeremy Fitzhardinge { 5550d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 556900e1833SDavid Vrabel struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 557a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx, *first_tx; 558a55e8bb8SDavid Vrabel unsigned int i; 5590d160211SJeremy Fitzhardinge int notify; 560f36c3747SIan Campbell int slots; 561a55e8bb8SDavid Vrabel struct page *page; 562a55e8bb8SDavid Vrabel unsigned int offset; 563a55e8bb8SDavid Vrabel unsigned int len; 564cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 5652688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 5662688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 5672688fcb7SAndrew J. Bennieston u16 queue_index; 568fd07160bSVitaly Kuznetsov struct sk_buff *nskb; 5692688fcb7SAndrew J. Bennieston 5702688fcb7SAndrew J. Bennieston /* Drop the packet if no queues are set up */ 5712688fcb7SAndrew J. Bennieston if (num_queues < 1) 5722688fcb7SAndrew J. Bennieston goto drop; 5732688fcb7SAndrew J. Bennieston /* Determine which queue to transmit this SKB on */ 5742688fcb7SAndrew J. Bennieston queue_index = skb_get_queue_mapping(skb); 5752688fcb7SAndrew J. Bennieston queue = &np->queues[queue_index]; 5760d160211SJeremy Fitzhardinge 5779ecd1a75SWei Liu /* If skb->len is too big for wire format, drop skb and alert 5789ecd1a75SWei Liu * user about misconfiguration. 5799ecd1a75SWei Liu */ 5809ecd1a75SWei Liu if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { 5819ecd1a75SWei Liu net_alert_ratelimited( 5829ecd1a75SWei Liu "xennet: skb->len = %u, too big for wire format\n", 5839ecd1a75SWei Liu skb->len); 5849ecd1a75SWei Liu goto drop; 5859ecd1a75SWei Liu } 5869ecd1a75SWei Liu 587e84448d5SDavid Vrabel slots = xennet_count_skb_slots(skb); 58830c5d7f0SJulien Grall if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { 58997a6d1bbSZoltan Kiss net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", 59097a6d1bbSZoltan Kiss slots, skb->len); 59197a6d1bbSZoltan Kiss if (skb_linearize(skb)) 5920d160211SJeremy Fitzhardinge goto drop; 5930d160211SJeremy Fitzhardinge } 5940d160211SJeremy Fitzhardinge 595a55e8bb8SDavid Vrabel page = virt_to_page(skb->data); 596a55e8bb8SDavid Vrabel offset = offset_in_page(skb->data); 597fd07160bSVitaly Kuznetsov 598fd07160bSVitaly Kuznetsov /* The first req should be at least ETH_HLEN size or the packet will be 599fd07160bSVitaly Kuznetsov * dropped by netback. 600fd07160bSVitaly Kuznetsov */ 601fd07160bSVitaly Kuznetsov if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { 602fd07160bSVitaly Kuznetsov nskb = skb_copy(skb, GFP_ATOMIC); 603fd07160bSVitaly Kuznetsov if (!nskb) 604fd07160bSVitaly Kuznetsov goto drop; 605fd07160bSVitaly Kuznetsov dev_kfree_skb_any(skb); 606fd07160bSVitaly Kuznetsov skb = nskb; 607fd07160bSVitaly Kuznetsov page = virt_to_page(skb->data); 608fd07160bSVitaly Kuznetsov offset = offset_in_page(skb->data); 609fd07160bSVitaly Kuznetsov } 610fd07160bSVitaly Kuznetsov 611a55e8bb8SDavid Vrabel len = skb_headlen(skb); 612a55e8bb8SDavid Vrabel 6132688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 6140d160211SJeremy Fitzhardinge 6150d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 616f36c3747SIan Campbell (slots > 1 && !xennet_can_sg(dev)) || 6178b86a61dSJohannes Berg netif_needs_gso(skb, netif_skb_features(skb)))) { 6182688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 6190d160211SJeremy Fitzhardinge goto drop; 6200d160211SJeremy Fitzhardinge } 6210d160211SJeremy Fitzhardinge 622a55e8bb8SDavid Vrabel /* First request for the linear area. */ 62330c5d7f0SJulien Grall first_tx = tx = xennet_make_first_txreq(queue, skb, 624a55e8bb8SDavid Vrabel page, offset, len); 62530c5d7f0SJulien Grall offset += tx->size; 62630c5d7f0SJulien Grall if (offset == PAGE_SIZE) { 627a55e8bb8SDavid Vrabel page++; 628a55e8bb8SDavid Vrabel offset = 0; 62930c5d7f0SJulien Grall } 630a55e8bb8SDavid Vrabel len -= tx->size; 6310d160211SJeremy Fitzhardinge 6320d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 6330d160211SJeremy Fitzhardinge /* local packet? */ 634f942dc25SIan Campbell tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; 6350d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 6360d160211SJeremy Fitzhardinge /* remote but checksummed. */ 637f942dc25SIan Campbell tx->flags |= XEN_NETTXF_data_validated; 6380d160211SJeremy Fitzhardinge 639a55e8bb8SDavid Vrabel /* Optional extra info after the first request. */ 6400d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 6410d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 6420d160211SJeremy Fitzhardinge 6430d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 644a55e8bb8SDavid Vrabel RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 6450d160211SJeremy Fitzhardinge 646f942dc25SIan Campbell tx->flags |= XEN_NETTXF_extra_info; 6470d160211SJeremy Fitzhardinge 6480d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 6492c0057deSPaul Durrant gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? 6502c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV6 : 6512c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV4; 6520d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 6530d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 6540d160211SJeremy Fitzhardinge 6550d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 6560d160211SJeremy Fitzhardinge gso->flags = 0; 6570d160211SJeremy Fitzhardinge } 6580d160211SJeremy Fitzhardinge 659a55e8bb8SDavid Vrabel /* Requests for the rest of the linear area. */ 660a55e8bb8SDavid Vrabel tx = xennet_make_txreqs(queue, tx, skb, page, offset, len); 6610d160211SJeremy Fitzhardinge 662a55e8bb8SDavid Vrabel /* Requests for all the frags. */ 663a55e8bb8SDavid Vrabel for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 664a55e8bb8SDavid Vrabel skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 665a55e8bb8SDavid Vrabel tx = xennet_make_txreqs(queue, tx, skb, 666a55e8bb8SDavid Vrabel skb_frag_page(frag), frag->page_offset, 667a55e8bb8SDavid Vrabel skb_frag_size(frag)); 668a55e8bb8SDavid Vrabel } 669a55e8bb8SDavid Vrabel 670a55e8bb8SDavid Vrabel /* First request has the packet length. */ 671a55e8bb8SDavid Vrabel first_tx->size = skb->len; 6720d160211SJeremy Fitzhardinge 6732688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 6740d160211SJeremy Fitzhardinge if (notify) 6752688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 6760d160211SJeremy Fitzhardinge 677900e1833SDavid Vrabel u64_stats_update_begin(&tx_stats->syncp); 678900e1833SDavid Vrabel tx_stats->bytes += skb->len; 679900e1833SDavid Vrabel tx_stats->packets++; 680900e1833SDavid Vrabel u64_stats_update_end(&tx_stats->syncp); 68110a273a6SJeremy Fitzhardinge 68210a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 6832688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 6840d160211SJeremy Fitzhardinge 6852688fcb7SAndrew J. Bennieston if (!netfront_tx_slot_available(queue)) 6862688fcb7SAndrew J. Bennieston netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); 6870d160211SJeremy Fitzhardinge 6882688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 6890d160211SJeremy Fitzhardinge 6906ed10654SPatrick McHardy return NETDEV_TX_OK; 6910d160211SJeremy Fitzhardinge 6920d160211SJeremy Fitzhardinge drop: 69309f75cd7SJeff Garzik dev->stats.tx_dropped++; 694979de8a0SEric W. Biederman dev_kfree_skb_any(skb); 6956ed10654SPatrick McHardy return NETDEV_TX_OK; 6960d160211SJeremy Fitzhardinge } 6970d160211SJeremy Fitzhardinge 6980d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 6990d160211SJeremy Fitzhardinge { 7000d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 7012688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 7022688fcb7SAndrew J. Bennieston unsigned int i; 7032688fcb7SAndrew J. Bennieston struct netfront_queue *queue; 7042688fcb7SAndrew J. Bennieston netif_tx_stop_all_queues(np->netdev); 7052688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 7062688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 7072688fcb7SAndrew J. Bennieston napi_disable(&queue->napi); 7082688fcb7SAndrew J. Bennieston } 7090d160211SJeremy Fitzhardinge return 0; 7100d160211SJeremy Fitzhardinge } 7110d160211SJeremy Fitzhardinge 7122688fcb7SAndrew J. Bennieston static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, 7130d160211SJeremy Fitzhardinge grant_ref_t ref) 7140d160211SJeremy Fitzhardinge { 7152688fcb7SAndrew J. Bennieston int new = xennet_rxidx(queue->rx.req_prod_pvt); 7160d160211SJeremy Fitzhardinge 7172688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[new]); 7182688fcb7SAndrew J. Bennieston queue->rx_skbs[new] = skb; 7192688fcb7SAndrew J. Bennieston queue->grant_rx_ref[new] = ref; 7202688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; 7212688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; 7222688fcb7SAndrew J. Bennieston queue->rx.req_prod_pvt++; 7230d160211SJeremy Fitzhardinge } 7240d160211SJeremy Fitzhardinge 7252688fcb7SAndrew J. Bennieston static int xennet_get_extras(struct netfront_queue *queue, 7260d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 7270d160211SJeremy Fitzhardinge RING_IDX rp) 7280d160211SJeremy Fitzhardinge 7290d160211SJeremy Fitzhardinge { 7300d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 7312688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 7322688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 7330d160211SJeremy Fitzhardinge int err = 0; 7340d160211SJeremy Fitzhardinge 7350d160211SJeremy Fitzhardinge do { 7360d160211SJeremy Fitzhardinge struct sk_buff *skb; 7370d160211SJeremy Fitzhardinge grant_ref_t ref; 7380d160211SJeremy Fitzhardinge 7390d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 7400d160211SJeremy Fitzhardinge if (net_ratelimit()) 7410d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 7420d160211SJeremy Fitzhardinge err = -EBADR; 7430d160211SJeremy Fitzhardinge break; 7440d160211SJeremy Fitzhardinge } 7450d160211SJeremy Fitzhardinge 7460d160211SJeremy Fitzhardinge extra = (struct xen_netif_extra_info *) 7472688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 7480d160211SJeremy Fitzhardinge 7490d160211SJeremy Fitzhardinge if (unlikely(!extra->type || 7500d160211SJeremy Fitzhardinge extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 7510d160211SJeremy Fitzhardinge if (net_ratelimit()) 7520d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 7530d160211SJeremy Fitzhardinge extra->type); 7540d160211SJeremy Fitzhardinge err = -EINVAL; 7550d160211SJeremy Fitzhardinge } else { 7560d160211SJeremy Fitzhardinge memcpy(&extras[extra->type - 1], extra, 7570d160211SJeremy Fitzhardinge sizeof(*extra)); 7580d160211SJeremy Fitzhardinge } 7590d160211SJeremy Fitzhardinge 7602688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons); 7612688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons); 7622688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 7630d160211SJeremy Fitzhardinge } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 7640d160211SJeremy Fitzhardinge 7652688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons; 7660d160211SJeremy Fitzhardinge return err; 7670d160211SJeremy Fitzhardinge } 7680d160211SJeremy Fitzhardinge 7692688fcb7SAndrew J. Bennieston static int xennet_get_responses(struct netfront_queue *queue, 7700d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 7710d160211SJeremy Fitzhardinge struct sk_buff_head *list) 7720d160211SJeremy Fitzhardinge { 7730d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo->rx; 7740d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo->extras; 7752688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 7762688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 7772688fcb7SAndrew J. Bennieston struct sk_buff *skb = xennet_get_rx_skb(queue, cons); 7782688fcb7SAndrew J. Bennieston grant_ref_t ref = xennet_get_rx_ref(queue, cons); 7790d160211SJeremy Fitzhardinge int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); 7807158ff6dSWei Liu int slots = 1; 7810d160211SJeremy Fitzhardinge int err = 0; 7820d160211SJeremy Fitzhardinge unsigned long ret; 7830d160211SJeremy Fitzhardinge 784f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_extra_info) { 7852688fcb7SAndrew J. Bennieston err = xennet_get_extras(queue, extras, rp); 7862688fcb7SAndrew J. Bennieston cons = queue->rx.rsp_cons; 7870d160211SJeremy Fitzhardinge } 7880d160211SJeremy Fitzhardinge 7890d160211SJeremy Fitzhardinge for (;;) { 7900d160211SJeremy Fitzhardinge if (unlikely(rx->status < 0 || 79130c5d7f0SJulien Grall rx->offset + rx->status > XEN_PAGE_SIZE)) { 7920d160211SJeremy Fitzhardinge if (net_ratelimit()) 7936c10127dSJulien Grall dev_warn(dev, "rx->offset: %u, size: %d\n", 7940d160211SJeremy Fitzhardinge rx->offset, rx->status); 7952688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 7960d160211SJeremy Fitzhardinge err = -EINVAL; 7970d160211SJeremy Fitzhardinge goto next; 7980d160211SJeremy Fitzhardinge } 7990d160211SJeremy Fitzhardinge 8000d160211SJeremy Fitzhardinge /* 8010d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 8020d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 803697089dcSWei Liu * situation to the system controller to reboot the backend. 8040d160211SJeremy Fitzhardinge */ 8050d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 8060d160211SJeremy Fitzhardinge if (net_ratelimit()) 8070d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 8080d160211SJeremy Fitzhardinge rx->id); 8090d160211SJeremy Fitzhardinge err = -EINVAL; 8100d160211SJeremy Fitzhardinge goto next; 8110d160211SJeremy Fitzhardinge } 8120d160211SJeremy Fitzhardinge 8130d160211SJeremy Fitzhardinge ret = gnttab_end_foreign_access_ref(ref, 0); 8140d160211SJeremy Fitzhardinge BUG_ON(!ret); 8150d160211SJeremy Fitzhardinge 8162688fcb7SAndrew J. Bennieston gnttab_release_grant_reference(&queue->gref_rx_head, ref); 8170d160211SJeremy Fitzhardinge 8180d160211SJeremy Fitzhardinge __skb_queue_tail(list, skb); 8190d160211SJeremy Fitzhardinge 8200d160211SJeremy Fitzhardinge next: 821f942dc25SIan Campbell if (!(rx->flags & XEN_NETRXF_more_data)) 8220d160211SJeremy Fitzhardinge break; 8230d160211SJeremy Fitzhardinge 8247158ff6dSWei Liu if (cons + slots == rp) { 8250d160211SJeremy Fitzhardinge if (net_ratelimit()) 8267158ff6dSWei Liu dev_warn(dev, "Need more slots\n"); 8270d160211SJeremy Fitzhardinge err = -ENOENT; 8280d160211SJeremy Fitzhardinge break; 8290d160211SJeremy Fitzhardinge } 8300d160211SJeremy Fitzhardinge 8312688fcb7SAndrew J. Bennieston rx = RING_GET_RESPONSE(&queue->rx, cons + slots); 8322688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons + slots); 8332688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons + slots); 8347158ff6dSWei Liu slots++; 8350d160211SJeremy Fitzhardinge } 8360d160211SJeremy Fitzhardinge 8377158ff6dSWei Liu if (unlikely(slots > max)) { 8380d160211SJeremy Fitzhardinge if (net_ratelimit()) 839697089dcSWei Liu dev_warn(dev, "Too many slots\n"); 8400d160211SJeremy Fitzhardinge err = -E2BIG; 8410d160211SJeremy Fitzhardinge } 8420d160211SJeremy Fitzhardinge 8430d160211SJeremy Fitzhardinge if (unlikely(err)) 8442688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons + slots; 8450d160211SJeremy Fitzhardinge 8460d160211SJeremy Fitzhardinge return err; 8470d160211SJeremy Fitzhardinge } 8480d160211SJeremy Fitzhardinge 8490d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 8500d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 8510d160211SJeremy Fitzhardinge { 8520d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 8530d160211SJeremy Fitzhardinge if (net_ratelimit()) 854383eda32SJoe Perches pr_warn("GSO size must not be zero\n"); 8550d160211SJeremy Fitzhardinge return -EINVAL; 8560d160211SJeremy Fitzhardinge } 8570d160211SJeremy Fitzhardinge 8582c0057deSPaul Durrant if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && 8592c0057deSPaul Durrant gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { 8600d160211SJeremy Fitzhardinge if (net_ratelimit()) 861383eda32SJoe Perches pr_warn("Bad GSO type %d\n", gso->u.gso.type); 8620d160211SJeremy Fitzhardinge return -EINVAL; 8630d160211SJeremy Fitzhardinge } 8640d160211SJeremy Fitzhardinge 8650d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 8662c0057deSPaul Durrant skb_shinfo(skb)->gso_type = 8672c0057deSPaul Durrant (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? 8682c0057deSPaul Durrant SKB_GSO_TCPV4 : 8692c0057deSPaul Durrant SKB_GSO_TCPV6; 8700d160211SJeremy Fitzhardinge 8710d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 8720d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 8730d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 8740d160211SJeremy Fitzhardinge 8750d160211SJeremy Fitzhardinge return 0; 8760d160211SJeremy Fitzhardinge } 8770d160211SJeremy Fitzhardinge 8782688fcb7SAndrew J. Bennieston static RING_IDX xennet_fill_frags(struct netfront_queue *queue, 8790d160211SJeremy Fitzhardinge struct sk_buff *skb, 8800d160211SJeremy Fitzhardinge struct sk_buff_head *list) 8810d160211SJeremy Fitzhardinge { 8820d160211SJeremy Fitzhardinge struct skb_shared_info *shinfo = skb_shinfo(skb); 8832688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 8840d160211SJeremy Fitzhardinge struct sk_buff *nskb; 8850d160211SJeremy Fitzhardinge 8860d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 8870d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = 8882688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 88901c68026SIan Campbell skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; 8900d160211SJeremy Fitzhardinge 891093b9c71SJan Beulich if (shinfo->nr_frags == MAX_SKB_FRAGS) { 892093b9c71SJan Beulich unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 8930d160211SJeremy Fitzhardinge 894093b9c71SJan Beulich BUG_ON(pull_to <= skb_headlen(skb)); 895093b9c71SJan Beulich __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 896093b9c71SJan Beulich } 897093b9c71SJan Beulich BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); 898093b9c71SJan Beulich 899093b9c71SJan Beulich skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), 900093b9c71SJan Beulich rx->offset, rx->status, PAGE_SIZE); 9010d160211SJeremy Fitzhardinge 9020d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 9030d160211SJeremy Fitzhardinge kfree_skb(nskb); 9040d160211SJeremy Fitzhardinge } 9050d160211SJeremy Fitzhardinge 9060d160211SJeremy Fitzhardinge return cons; 9070d160211SJeremy Fitzhardinge } 9080d160211SJeremy Fitzhardinge 909e0ce4af9SIan Campbell static int checksum_setup(struct net_device *dev, struct sk_buff *skb) 9100d160211SJeremy Fitzhardinge { 911b5cf66cdSPaul Durrant bool recalculate_partial_csum = false; 912e0ce4af9SIan Campbell 913e0ce4af9SIan Campbell /* 914e0ce4af9SIan Campbell * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy 915e0ce4af9SIan Campbell * peers can fail to set NETRXF_csum_blank when sending a GSO 916e0ce4af9SIan Campbell * frame. In this case force the SKB to CHECKSUM_PARTIAL and 917e0ce4af9SIan Campbell * recalculate the partial checksum. 918e0ce4af9SIan Campbell */ 919e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { 920e0ce4af9SIan Campbell struct netfront_info *np = netdev_priv(dev); 9212688fcb7SAndrew J. Bennieston atomic_inc(&np->rx_gso_checksum_fixup); 922e0ce4af9SIan Campbell skb->ip_summed = CHECKSUM_PARTIAL; 923b5cf66cdSPaul Durrant recalculate_partial_csum = true; 924e0ce4af9SIan Campbell } 925e0ce4af9SIan Campbell 926e0ce4af9SIan Campbell /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ 927e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL) 928e0ce4af9SIan Campbell return 0; 9290d160211SJeremy Fitzhardinge 930b5cf66cdSPaul Durrant return skb_checksum_setup(skb, recalculate_partial_csum); 9310d160211SJeremy Fitzhardinge } 9320d160211SJeremy Fitzhardinge 9332688fcb7SAndrew J. Bennieston static int handle_incoming_queue(struct netfront_queue *queue, 9340d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 9350d160211SJeremy Fitzhardinge { 936900e1833SDavid Vrabel struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); 9370d160211SJeremy Fitzhardinge int packets_dropped = 0; 9380d160211SJeremy Fitzhardinge struct sk_buff *skb; 9390d160211SJeremy Fitzhardinge 9400d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 9413683243bSIan Campbell int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 9420d160211SJeremy Fitzhardinge 943093b9c71SJan Beulich if (pull_to > skb_headlen(skb)) 9443683243bSIan Campbell __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 9450d160211SJeremy Fitzhardinge 9460d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 9472688fcb7SAndrew J. Bennieston skb->protocol = eth_type_trans(skb, queue->info->netdev); 948d554f73dSWei Liu skb_reset_network_header(skb); 9490d160211SJeremy Fitzhardinge 9502688fcb7SAndrew J. Bennieston if (checksum_setup(queue->info->netdev, skb)) { 9510d160211SJeremy Fitzhardinge kfree_skb(skb); 9520d160211SJeremy Fitzhardinge packets_dropped++; 9532688fcb7SAndrew J. Bennieston queue->info->netdev->stats.rx_errors++; 9540d160211SJeremy Fitzhardinge continue; 9550d160211SJeremy Fitzhardinge } 9560d160211SJeremy Fitzhardinge 957900e1833SDavid Vrabel u64_stats_update_begin(&rx_stats->syncp); 958900e1833SDavid Vrabel rx_stats->packets++; 959900e1833SDavid Vrabel rx_stats->bytes += skb->len; 960900e1833SDavid Vrabel u64_stats_update_end(&rx_stats->syncp); 9610d160211SJeremy Fitzhardinge 9620d160211SJeremy Fitzhardinge /* Pass it up. */ 9632688fcb7SAndrew J. Bennieston napi_gro_receive(&queue->napi, skb); 9640d160211SJeremy Fitzhardinge } 9650d160211SJeremy Fitzhardinge 9660d160211SJeremy Fitzhardinge return packets_dropped; 9670d160211SJeremy Fitzhardinge } 9680d160211SJeremy Fitzhardinge 969bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 9700d160211SJeremy Fitzhardinge { 9712688fcb7SAndrew J. Bennieston struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); 9722688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 9730d160211SJeremy Fitzhardinge struct sk_buff *skb; 9740d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 9750d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 9760d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 9770d160211SJeremy Fitzhardinge RING_IDX i, rp; 978bea3348eSStephen Hemminger int work_done; 9790d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 9800d160211SJeremy Fitzhardinge struct sk_buff_head errq; 9810d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 9820d160211SJeremy Fitzhardinge int err; 9830d160211SJeremy Fitzhardinge 9842688fcb7SAndrew J. Bennieston spin_lock(&queue->rx_lock); 9850d160211SJeremy Fitzhardinge 9860d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 9870d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 9880d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 9890d160211SJeremy Fitzhardinge 9902688fcb7SAndrew J. Bennieston rp = queue->rx.sring->rsp_prod; 9910d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 9920d160211SJeremy Fitzhardinge 9932688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 9940d160211SJeremy Fitzhardinge work_done = 0; 9950d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 9962688fcb7SAndrew J. Bennieston memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx)); 9970d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 9980d160211SJeremy Fitzhardinge 9992688fcb7SAndrew J. Bennieston err = xennet_get_responses(queue, &rinfo, rp, &tmpq); 10000d160211SJeremy Fitzhardinge 10010d160211SJeremy Fitzhardinge if (unlikely(err)) { 10020d160211SJeremy Fitzhardinge err: 10030d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 10040d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 100509f75cd7SJeff Garzik dev->stats.rx_errors++; 10062688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 10070d160211SJeremy Fitzhardinge continue; 10080d160211SJeremy Fitzhardinge } 10090d160211SJeremy Fitzhardinge 10100d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 10110d160211SJeremy Fitzhardinge 10120d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 10130d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 10140d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 10150d160211SJeremy Fitzhardinge 10160d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 10170d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 10182688fcb7SAndrew J. Bennieston queue->rx.rsp_cons += skb_queue_len(&tmpq); 10190d160211SJeremy Fitzhardinge goto err; 10200d160211SJeremy Fitzhardinge } 10210d160211SJeremy Fitzhardinge } 10220d160211SJeremy Fitzhardinge 10233683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = rx->status; 10243683243bSIan Campbell if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) 10253683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; 10260d160211SJeremy Fitzhardinge 10273683243bSIan Campbell skb_shinfo(skb)->frags[0].page_offset = rx->offset; 10283683243bSIan Campbell skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); 10293683243bSIan Campbell skb->data_len = rx->status; 1030093b9c71SJan Beulich skb->len += rx->status; 10310d160211SJeremy Fitzhardinge 10322688fcb7SAndrew J. Bennieston i = xennet_fill_frags(queue, skb, &tmpq); 10330d160211SJeremy Fitzhardinge 1034f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_csum_blank) 10350d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 1036f942dc25SIan Campbell else if (rx->flags & XEN_NETRXF_data_validated) 10370d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 10380d160211SJeremy Fitzhardinge 10390d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 10400d160211SJeremy Fitzhardinge 10412688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = ++i; 10420d160211SJeremy Fitzhardinge work_done++; 10430d160211SJeremy Fitzhardinge } 10440d160211SJeremy Fitzhardinge 104556cfe5d0SWang Chen __skb_queue_purge(&errq); 10460d160211SJeremy Fitzhardinge 10472688fcb7SAndrew J. Bennieston work_done -= handle_incoming_queue(queue, &rxq); 10480d160211SJeremy Fitzhardinge 10492688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 10500d160211SJeremy Fitzhardinge 10510d160211SJeremy Fitzhardinge if (work_done < budget) { 1052bea3348eSStephen Hemminger int more_to_do = 0; 1053bea3348eSStephen Hemminger 10546a6dc08fSDavid Vrabel napi_complete(napi); 10550d160211SJeremy Fitzhardinge 10562688fcb7SAndrew J. Bennieston RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); 10576a6dc08fSDavid Vrabel if (more_to_do) 10586a6dc08fSDavid Vrabel napi_schedule(napi); 10590d160211SJeremy Fitzhardinge } 10600d160211SJeremy Fitzhardinge 10612688fcb7SAndrew J. Bennieston spin_unlock(&queue->rx_lock); 10620d160211SJeremy Fitzhardinge 1063bea3348eSStephen Hemminger return work_done; 10640d160211SJeremy Fitzhardinge } 10650d160211SJeremy Fitzhardinge 10660d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 10670d160211SJeremy Fitzhardinge { 10680c36820eSJonathan Davies int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; 10690d160211SJeremy Fitzhardinge 10700d160211SJeremy Fitzhardinge if (mtu > max) 10710d160211SJeremy Fitzhardinge return -EINVAL; 10720d160211SJeremy Fitzhardinge dev->mtu = mtu; 10730d160211SJeremy Fitzhardinge return 0; 10740d160211SJeremy Fitzhardinge } 10750d160211SJeremy Fitzhardinge 1076e00f85beSstephen hemminger static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, 1077e00f85beSstephen hemminger struct rtnl_link_stats64 *tot) 1078e00f85beSstephen hemminger { 1079e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 1080e00f85beSstephen hemminger int cpu; 1081e00f85beSstephen hemminger 1082e00f85beSstephen hemminger for_each_possible_cpu(cpu) { 1083900e1833SDavid Vrabel struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); 1084900e1833SDavid Vrabel struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); 1085e00f85beSstephen hemminger u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1086e00f85beSstephen hemminger unsigned int start; 1087e00f85beSstephen hemminger 1088e00f85beSstephen hemminger do { 1089900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&tx_stats->syncp); 1090900e1833SDavid Vrabel tx_packets = tx_stats->packets; 1091900e1833SDavid Vrabel tx_bytes = tx_stats->bytes; 1092900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); 1093e00f85beSstephen hemminger 1094900e1833SDavid Vrabel do { 1095900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&rx_stats->syncp); 1096900e1833SDavid Vrabel rx_packets = rx_stats->packets; 1097900e1833SDavid Vrabel rx_bytes = rx_stats->bytes; 1098900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); 1099e00f85beSstephen hemminger 1100e00f85beSstephen hemminger tot->rx_packets += rx_packets; 1101e00f85beSstephen hemminger tot->tx_packets += tx_packets; 1102e00f85beSstephen hemminger tot->rx_bytes += rx_bytes; 1103e00f85beSstephen hemminger tot->tx_bytes += tx_bytes; 1104e00f85beSstephen hemminger } 1105e00f85beSstephen hemminger 1106e00f85beSstephen hemminger tot->rx_errors = dev->stats.rx_errors; 1107e00f85beSstephen hemminger tot->tx_dropped = dev->stats.tx_dropped; 1108e00f85beSstephen hemminger 1109e00f85beSstephen hemminger return tot; 1110e00f85beSstephen hemminger } 1111e00f85beSstephen hemminger 11122688fcb7SAndrew J. Bennieston static void xennet_release_tx_bufs(struct netfront_queue *queue) 11130d160211SJeremy Fitzhardinge { 11140d160211SJeremy Fitzhardinge struct sk_buff *skb; 11150d160211SJeremy Fitzhardinge int i; 11160d160211SJeremy Fitzhardinge 11170d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 11180d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 11192688fcb7SAndrew J. Bennieston if (skb_entry_is_link(&queue->tx_skbs[i])) 11200d160211SJeremy Fitzhardinge continue; 11210d160211SJeremy Fitzhardinge 11222688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[i].skb; 11232688fcb7SAndrew J. Bennieston get_page(queue->grant_tx_page[i]); 11242688fcb7SAndrew J. Bennieston gnttab_end_foreign_access(queue->grant_tx_ref[i], 1125cefe0078SAnnie Li GNTMAP_readonly, 11262688fcb7SAndrew J. Bennieston (unsigned long)page_address(queue->grant_tx_page[i])); 11272688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 11282688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 11292688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i); 11300d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 11310d160211SJeremy Fitzhardinge } 11320d160211SJeremy Fitzhardinge } 11330d160211SJeremy Fitzhardinge 11342688fcb7SAndrew J. Bennieston static void xennet_release_rx_bufs(struct netfront_queue *queue) 11350d160211SJeremy Fitzhardinge { 11360d160211SJeremy Fitzhardinge int id, ref; 11370d160211SJeremy Fitzhardinge 11382688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 11390d160211SJeremy Fitzhardinge 11400d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 1141cefe0078SAnnie Li struct sk_buff *skb; 1142cefe0078SAnnie Li struct page *page; 11430d160211SJeremy Fitzhardinge 11442688fcb7SAndrew J. Bennieston skb = queue->rx_skbs[id]; 1145cefe0078SAnnie Li if (!skb) 1146cefe0078SAnnie Li continue; 1147cefe0078SAnnie Li 11482688fcb7SAndrew J. Bennieston ref = queue->grant_rx_ref[id]; 1149cefe0078SAnnie Li if (ref == GRANT_INVALID_REF) 1150cefe0078SAnnie Li continue; 1151cefe0078SAnnie Li 1152cefe0078SAnnie Li page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 1153cefe0078SAnnie Li 1154cefe0078SAnnie Li /* gnttab_end_foreign_access() needs a page ref until 1155cefe0078SAnnie Li * foreign access is ended (which may be deferred). 1156cefe0078SAnnie Li */ 1157cefe0078SAnnie Li get_page(page); 1158cefe0078SAnnie Li gnttab_end_foreign_access(ref, 0, 1159cefe0078SAnnie Li (unsigned long)page_address(page)); 11602688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = GRANT_INVALID_REF; 11610d160211SJeremy Fitzhardinge 1162cefe0078SAnnie Li kfree_skb(skb); 11630d160211SJeremy Fitzhardinge } 11640d160211SJeremy Fitzhardinge 11652688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 11660d160211SJeremy Fitzhardinge } 11670d160211SJeremy Fitzhardinge 1168c8f44affSMichał Mirosław static netdev_features_t xennet_fix_features(struct net_device *dev, 1169c8f44affSMichał Mirosław netdev_features_t features) 11708f7b01a1SEric Dumazet { 11718f7b01a1SEric Dumazet struct netfront_info *np = netdev_priv(dev); 11728f7b01a1SEric Dumazet 11732890ea5cSJuergen Gross if (features & NETIF_F_SG && 11742890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) 11758f7b01a1SEric Dumazet features &= ~NETIF_F_SG; 11768f7b01a1SEric Dumazet 11772890ea5cSJuergen Gross if (features & NETIF_F_IPV6_CSUM && 11782890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, 11792890ea5cSJuergen Gross "feature-ipv6-csum-offload", 0)) 11802c0057deSPaul Durrant features &= ~NETIF_F_IPV6_CSUM; 11812c0057deSPaul Durrant 11822890ea5cSJuergen Gross if (features & NETIF_F_TSO && 11832890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) 11848f7b01a1SEric Dumazet features &= ~NETIF_F_TSO; 11858f7b01a1SEric Dumazet 11862890ea5cSJuergen Gross if (features & NETIF_F_TSO6 && 11872890ea5cSJuergen Gross !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) 11882c0057deSPaul Durrant features &= ~NETIF_F_TSO6; 11892c0057deSPaul Durrant 11908f7b01a1SEric Dumazet return features; 11918f7b01a1SEric Dumazet } 11928f7b01a1SEric Dumazet 1193c8f44affSMichał Mirosław static int xennet_set_features(struct net_device *dev, 1194c8f44affSMichał Mirosław netdev_features_t features) 11958f7b01a1SEric Dumazet { 11968f7b01a1SEric Dumazet if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { 11978f7b01a1SEric Dumazet netdev_info(dev, "Reducing MTU because no SG offload"); 11988f7b01a1SEric Dumazet dev->mtu = ETH_DATA_LEN; 11998f7b01a1SEric Dumazet } 12008f7b01a1SEric Dumazet 12018f7b01a1SEric Dumazet return 0; 12028f7b01a1SEric Dumazet } 12038f7b01a1SEric Dumazet 1204d634bf2cSWei Liu static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) 1205cf66f9d4SKonrad Rzeszutek Wilk { 12062688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 1207cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 1208cf66f9d4SKonrad Rzeszutek Wilk 12092688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 12102688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 12112688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 1212cf66f9d4SKonrad Rzeszutek Wilk 1213cf66f9d4SKonrad Rzeszutek Wilk return IRQ_HANDLED; 1214cf66f9d4SKonrad Rzeszutek Wilk } 1215cf66f9d4SKonrad Rzeszutek Wilk 1216d634bf2cSWei Liu static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) 1217d634bf2cSWei Liu { 12182688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 12192688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 1220d634bf2cSWei Liu 1221d634bf2cSWei Liu if (likely(netif_carrier_ok(dev) && 12222688fcb7SAndrew J. Bennieston RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) 12232688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 1224d634bf2cSWei Liu 1225d634bf2cSWei Liu return IRQ_HANDLED; 1226d634bf2cSWei Liu } 1227d634bf2cSWei Liu 1228d634bf2cSWei Liu static irqreturn_t xennet_interrupt(int irq, void *dev_id) 1229d634bf2cSWei Liu { 1230d634bf2cSWei Liu xennet_tx_interrupt(irq, dev_id); 1231d634bf2cSWei Liu xennet_rx_interrupt(irq, dev_id); 1232d634bf2cSWei Liu return IRQ_HANDLED; 1233d634bf2cSWei Liu } 1234d634bf2cSWei Liu 1235cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1236cf66f9d4SKonrad Rzeszutek Wilk static void xennet_poll_controller(struct net_device *dev) 1237cf66f9d4SKonrad Rzeszutek Wilk { 12382688fcb7SAndrew J. Bennieston /* Poll each queue */ 12392688fcb7SAndrew J. Bennieston struct netfront_info *info = netdev_priv(dev); 12402688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 12412688fcb7SAndrew J. Bennieston unsigned int i; 12422688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) 12432688fcb7SAndrew J. Bennieston xennet_interrupt(0, &info->queues[i]); 1244cf66f9d4SKonrad Rzeszutek Wilk } 1245cf66f9d4SKonrad Rzeszutek Wilk #endif 1246cf66f9d4SKonrad Rzeszutek Wilk 12470a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 12480a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 12490a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 12500a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 12510a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 1252e00f85beSstephen hemminger .ndo_get_stats64 = xennet_get_stats64, 12530a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 12540a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 1255fb507934SMichał Mirosław .ndo_fix_features = xennet_fix_features, 1256fb507934SMichał Mirosław .ndo_set_features = xennet_set_features, 12572688fcb7SAndrew J. Bennieston .ndo_select_queue = xennet_select_queue, 1258cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1259cf66f9d4SKonrad Rzeszutek Wilk .ndo_poll_controller = xennet_poll_controller, 1260cf66f9d4SKonrad Rzeszutek Wilk #endif 12610a0b9d2eSStephen Hemminger }; 12620a0b9d2eSStephen Hemminger 1263900e1833SDavid Vrabel static void xennet_free_netdev(struct net_device *netdev) 1264900e1833SDavid Vrabel { 1265900e1833SDavid Vrabel struct netfront_info *np = netdev_priv(netdev); 1266900e1833SDavid Vrabel 1267900e1833SDavid Vrabel free_percpu(np->rx_stats); 1268900e1833SDavid Vrabel free_percpu(np->tx_stats); 1269900e1833SDavid Vrabel free_netdev(netdev); 1270900e1833SDavid Vrabel } 1271900e1833SDavid Vrabel 12728e0e46bbSBill Pemberton static struct net_device *xennet_create_dev(struct xenbus_device *dev) 12730d160211SJeremy Fitzhardinge { 12742688fcb7SAndrew J. Bennieston int err; 12750d160211SJeremy Fitzhardinge struct net_device *netdev; 12760d160211SJeremy Fitzhardinge struct netfront_info *np; 12770d160211SJeremy Fitzhardinge 127850ee6061SAndrew J. Bennieston netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); 127941de8d4cSJoe Perches if (!netdev) 12800d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 12810d160211SJeremy Fitzhardinge 12820d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 12830d160211SJeremy Fitzhardinge np->xbdev = dev; 12840d160211SJeremy Fitzhardinge 12852688fcb7SAndrew J. Bennieston np->queues = NULL; 12860d160211SJeremy Fitzhardinge 1287e00f85beSstephen hemminger err = -ENOMEM; 1288900e1833SDavid Vrabel np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1289900e1833SDavid Vrabel if (np->rx_stats == NULL) 1290900e1833SDavid Vrabel goto exit; 1291900e1833SDavid Vrabel np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1292900e1833SDavid Vrabel if (np->tx_stats == NULL) 1293e00f85beSstephen hemminger goto exit; 1294e00f85beSstephen hemminger 12950a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 12960a0b9d2eSStephen Hemminger 1297fb507934SMichał Mirosław netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | 1298fb507934SMichał Mirosław NETIF_F_GSO_ROBUST; 12992c0057deSPaul Durrant netdev->hw_features = NETIF_F_SG | 13002c0057deSPaul Durrant NETIF_F_IPV6_CSUM | 13012c0057deSPaul Durrant NETIF_F_TSO | NETIF_F_TSO6; 13020d160211SJeremy Fitzhardinge 1303fc3e5941SIan Campbell /* 1304fc3e5941SIan Campbell * Assume that all hw features are available for now. This set 1305fc3e5941SIan Campbell * will be adjusted by the call to netdev_update_features() in 1306fc3e5941SIan Campbell * xennet_connect() which is the earliest point where we can 1307fc3e5941SIan Campbell * negotiate with the backend regarding supported features. 1308fc3e5941SIan Campbell */ 1309fc3e5941SIan Campbell netdev->features |= netdev->hw_features; 1310fc3e5941SIan Campbell 13117ad24ea4SWilfried Klaebe netdev->ethtool_ops = &xennet_ethtool_ops; 1312d0c2c997SJarod Wilson netdev->min_mtu = 0; 1313d0c2c997SJarod Wilson netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; 13140d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 13150d160211SJeremy Fitzhardinge 13160d160211SJeremy Fitzhardinge np->netdev = netdev; 13170d160211SJeremy Fitzhardinge 13180d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 13190d160211SJeremy Fitzhardinge 13200d160211SJeremy Fitzhardinge return netdev; 13210d160211SJeremy Fitzhardinge 13220d160211SJeremy Fitzhardinge exit: 1323900e1833SDavid Vrabel xennet_free_netdev(netdev); 13240d160211SJeremy Fitzhardinge return ERR_PTR(err); 13250d160211SJeremy Fitzhardinge } 13260d160211SJeremy Fitzhardinge 13270d160211SJeremy Fitzhardinge /** 13280d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 13290d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 13300d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 13310d160211SJeremy Fitzhardinge */ 13328e0e46bbSBill Pemberton static int netfront_probe(struct xenbus_device *dev, 13330d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 13340d160211SJeremy Fitzhardinge { 13350d160211SJeremy Fitzhardinge int err; 13360d160211SJeremy Fitzhardinge struct net_device *netdev; 13370d160211SJeremy Fitzhardinge struct netfront_info *info; 13380d160211SJeremy Fitzhardinge 13390d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 13400d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 13410d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 13420d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 13430d160211SJeremy Fitzhardinge return err; 13440d160211SJeremy Fitzhardinge } 13450d160211SJeremy Fitzhardinge 13460d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 13471b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 134827b917e5STakashi Iwai #ifdef CONFIG_SYSFS 134927b917e5STakashi Iwai info->netdev->sysfs_groups[0] = &xennet_dev_group; 135027b917e5STakashi Iwai #endif 13510d160211SJeremy Fitzhardinge err = register_netdev(info->netdev); 13520d160211SJeremy Fitzhardinge if (err) { 1353383eda32SJoe Perches pr_warn("%s: register_netdev err=%d\n", __func__, err); 13540d160211SJeremy Fitzhardinge goto fail; 13550d160211SJeremy Fitzhardinge } 13560d160211SJeremy Fitzhardinge 13570d160211SJeremy Fitzhardinge return 0; 13580d160211SJeremy Fitzhardinge 13590d160211SJeremy Fitzhardinge fail: 1360900e1833SDavid Vrabel xennet_free_netdev(netdev); 13611b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, NULL); 13620d160211SJeremy Fitzhardinge return err; 13630d160211SJeremy Fitzhardinge } 13640d160211SJeremy Fitzhardinge 13650d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 13660d160211SJeremy Fitzhardinge { 13670d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 13680d160211SJeremy Fitzhardinge if (ref != GRANT_INVALID_REF) 13690d160211SJeremy Fitzhardinge gnttab_end_foreign_access(ref, 0, (unsigned long)page); 13700d160211SJeremy Fitzhardinge } 13710d160211SJeremy Fitzhardinge 13720d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 13730d160211SJeremy Fitzhardinge { 13742688fcb7SAndrew J. Bennieston unsigned int i = 0; 13752688fcb7SAndrew J. Bennieston unsigned int num_queues = info->netdev->real_num_tx_queues; 13760d160211SJeremy Fitzhardinge 1377f9feb1e6SDavid Vrabel netif_carrier_off(info->netdev); 1378f9feb1e6SDavid Vrabel 13799a873c71SChas Williams for (i = 0; i < num_queues && info->queues; ++i) { 138076541869SDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 138176541869SDavid Vrabel 13822688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) 13832688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 13842688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { 13852688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 13862688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->rx_irq, queue); 1387d634bf2cSWei Liu } 13882688fcb7SAndrew J. Bennieston queue->tx_evtchn = queue->rx_evtchn = 0; 13892688fcb7SAndrew J. Bennieston queue->tx_irq = queue->rx_irq = 0; 13900d160211SJeremy Fitzhardinge 1391274b0455SChas Williams if (netif_running(info->netdev)) 1392f9feb1e6SDavid Vrabel napi_synchronize(&queue->napi); 1393f9feb1e6SDavid Vrabel 1394a5b5dc3cSDavid Vrabel xennet_release_tx_bufs(queue); 1395a5b5dc3cSDavid Vrabel xennet_release_rx_bufs(queue); 1396a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_tx_head); 1397a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_rx_head); 1398a5b5dc3cSDavid Vrabel 13990d160211SJeremy Fitzhardinge /* End access and free the pages */ 14002688fcb7SAndrew J. Bennieston xennet_end_access(queue->tx_ring_ref, queue->tx.sring); 14012688fcb7SAndrew J. Bennieston xennet_end_access(queue->rx_ring_ref, queue->rx.sring); 14020d160211SJeremy Fitzhardinge 14032688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 14042688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 14052688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 14062688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 14072688fcb7SAndrew J. Bennieston } 14080d160211SJeremy Fitzhardinge } 14090d160211SJeremy Fitzhardinge 14100d160211SJeremy Fitzhardinge /** 14110d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 14120d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 14130d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 14140d160211SJeremy Fitzhardinge * rest of the kernel. 14150d160211SJeremy Fitzhardinge */ 14160d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 14170d160211SJeremy Fitzhardinge { 14181b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 14190d160211SJeremy Fitzhardinge 14200d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 14210d160211SJeremy Fitzhardinge 14220d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 14230d160211SJeremy Fitzhardinge return 0; 14240d160211SJeremy Fitzhardinge } 14250d160211SJeremy Fitzhardinge 14260d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 14270d160211SJeremy Fitzhardinge { 14280d160211SJeremy Fitzhardinge char *s, *e, *macstr; 14290d160211SJeremy Fitzhardinge int i; 14300d160211SJeremy Fitzhardinge 14310d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 14320d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 14330d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 14340d160211SJeremy Fitzhardinge 14350d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 14360d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 14370d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 14380d160211SJeremy Fitzhardinge kfree(macstr); 14390d160211SJeremy Fitzhardinge return -ENOENT; 14400d160211SJeremy Fitzhardinge } 14410d160211SJeremy Fitzhardinge s = e+1; 14420d160211SJeremy Fitzhardinge } 14430d160211SJeremy Fitzhardinge 14440d160211SJeremy Fitzhardinge kfree(macstr); 14450d160211SJeremy Fitzhardinge return 0; 14460d160211SJeremy Fitzhardinge } 14470d160211SJeremy Fitzhardinge 14482688fcb7SAndrew J. Bennieston static int setup_netfront_single(struct netfront_queue *queue) 1449d634bf2cSWei Liu { 1450d634bf2cSWei Liu int err; 1451d634bf2cSWei Liu 14522688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1453d634bf2cSWei Liu if (err < 0) 1454d634bf2cSWei Liu goto fail; 1455d634bf2cSWei Liu 14562688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1457d634bf2cSWei Liu xennet_interrupt, 14582688fcb7SAndrew J. Bennieston 0, queue->info->netdev->name, queue); 1459d634bf2cSWei Liu if (err < 0) 1460d634bf2cSWei Liu goto bind_fail; 14612688fcb7SAndrew J. Bennieston queue->rx_evtchn = queue->tx_evtchn; 14622688fcb7SAndrew J. Bennieston queue->rx_irq = queue->tx_irq = err; 1463d634bf2cSWei Liu 1464d634bf2cSWei Liu return 0; 1465d634bf2cSWei Liu 1466d634bf2cSWei Liu bind_fail: 14672688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 14682688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1469d634bf2cSWei Liu fail: 1470d634bf2cSWei Liu return err; 1471d634bf2cSWei Liu } 1472d634bf2cSWei Liu 14732688fcb7SAndrew J. Bennieston static int setup_netfront_split(struct netfront_queue *queue) 1474d634bf2cSWei Liu { 1475d634bf2cSWei Liu int err; 1476d634bf2cSWei Liu 14772688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1478d634bf2cSWei Liu if (err < 0) 1479d634bf2cSWei Liu goto fail; 14802688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); 1481d634bf2cSWei Liu if (err < 0) 1482d634bf2cSWei Liu goto alloc_rx_evtchn_fail; 1483d634bf2cSWei Liu 14842688fcb7SAndrew J. Bennieston snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 14852688fcb7SAndrew J. Bennieston "%s-tx", queue->name); 14862688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1487d634bf2cSWei Liu xennet_tx_interrupt, 14882688fcb7SAndrew J. Bennieston 0, queue->tx_irq_name, queue); 1489d634bf2cSWei Liu if (err < 0) 1490d634bf2cSWei Liu goto bind_tx_fail; 14912688fcb7SAndrew J. Bennieston queue->tx_irq = err; 1492d634bf2cSWei Liu 14932688fcb7SAndrew J. Bennieston snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 14942688fcb7SAndrew J. Bennieston "%s-rx", queue->name); 14952688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->rx_evtchn, 1496d634bf2cSWei Liu xennet_rx_interrupt, 14972688fcb7SAndrew J. Bennieston 0, queue->rx_irq_name, queue); 1498d634bf2cSWei Liu if (err < 0) 1499d634bf2cSWei Liu goto bind_rx_fail; 15002688fcb7SAndrew J. Bennieston queue->rx_irq = err; 1501d634bf2cSWei Liu 1502d634bf2cSWei Liu return 0; 1503d634bf2cSWei Liu 1504d634bf2cSWei Liu bind_rx_fail: 15052688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 15062688fcb7SAndrew J. Bennieston queue->tx_irq = 0; 1507d634bf2cSWei Liu bind_tx_fail: 15082688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); 15092688fcb7SAndrew J. Bennieston queue->rx_evtchn = 0; 1510d634bf2cSWei Liu alloc_rx_evtchn_fail: 15112688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 15122688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1513d634bf2cSWei Liu fail: 1514d634bf2cSWei Liu return err; 1515d634bf2cSWei Liu } 1516d634bf2cSWei Liu 15172688fcb7SAndrew J. Bennieston static int setup_netfront(struct xenbus_device *dev, 15182688fcb7SAndrew J. Bennieston struct netfront_queue *queue, unsigned int feature_split_evtchn) 15190d160211SJeremy Fitzhardinge { 15200d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 15210d160211SJeremy Fitzhardinge struct xen_netif_rx_sring *rxs; 1522ccc9d90aSWei Liu grant_ref_t gref; 15230d160211SJeremy Fitzhardinge int err; 15240d160211SJeremy Fitzhardinge 15252688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 15262688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 15272688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 15282688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 15290d160211SJeremy Fitzhardinge 1530a144ff09SIan Campbell txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 15310d160211SJeremy Fitzhardinge if (!txs) { 15320d160211SJeremy Fitzhardinge err = -ENOMEM; 15330d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating tx ring page"); 15340d160211SJeremy Fitzhardinge goto fail; 15350d160211SJeremy Fitzhardinge } 15360d160211SJeremy Fitzhardinge SHARED_RING_INIT(txs); 153730c5d7f0SJulien Grall FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); 15380d160211SJeremy Fitzhardinge 1539ccc9d90aSWei Liu err = xenbus_grant_ring(dev, txs, 1, &gref); 15401ca2983aSWei Liu if (err < 0) 15411ca2983aSWei Liu goto grant_tx_ring_fail; 1542ccc9d90aSWei Liu queue->tx_ring_ref = gref; 15430d160211SJeremy Fitzhardinge 1544a144ff09SIan Campbell rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 15450d160211SJeremy Fitzhardinge if (!rxs) { 15460d160211SJeremy Fitzhardinge err = -ENOMEM; 15470d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating rx ring page"); 15481ca2983aSWei Liu goto alloc_rx_ring_fail; 15490d160211SJeremy Fitzhardinge } 15500d160211SJeremy Fitzhardinge SHARED_RING_INIT(rxs); 155130c5d7f0SJulien Grall FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); 15520d160211SJeremy Fitzhardinge 1553ccc9d90aSWei Liu err = xenbus_grant_ring(dev, rxs, 1, &gref); 15541ca2983aSWei Liu if (err < 0) 15551ca2983aSWei Liu goto grant_rx_ring_fail; 1556ccc9d90aSWei Liu queue->rx_ring_ref = gref; 15570d160211SJeremy Fitzhardinge 1558d634bf2cSWei Liu if (feature_split_evtchn) 15592688fcb7SAndrew J. Bennieston err = setup_netfront_split(queue); 1560d634bf2cSWei Liu /* setup single event channel if 1561d634bf2cSWei Liu * a) feature-split-event-channels == 0 1562d634bf2cSWei Liu * b) feature-split-event-channels == 1 but failed to setup 1563d634bf2cSWei Liu */ 1564d634bf2cSWei Liu if (!feature_split_evtchn || (feature_split_evtchn && err)) 15652688fcb7SAndrew J. Bennieston err = setup_netfront_single(queue); 1566d634bf2cSWei Liu 15670d160211SJeremy Fitzhardinge if (err) 15681ca2983aSWei Liu goto alloc_evtchn_fail; 15690d160211SJeremy Fitzhardinge 15700d160211SJeremy Fitzhardinge return 0; 15710d160211SJeremy Fitzhardinge 15721ca2983aSWei Liu /* If we fail to setup netfront, it is safe to just revoke access to 15731ca2983aSWei Liu * granted pages because backend is not accessing it at this point. 15741ca2983aSWei Liu */ 15751ca2983aSWei Liu alloc_evtchn_fail: 15762688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); 15771ca2983aSWei Liu grant_rx_ring_fail: 15781ca2983aSWei Liu free_page((unsigned long)rxs); 15791ca2983aSWei Liu alloc_rx_ring_fail: 15802688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); 15811ca2983aSWei Liu grant_tx_ring_fail: 15821ca2983aSWei Liu free_page((unsigned long)txs); 15830d160211SJeremy Fitzhardinge fail: 15840d160211SJeremy Fitzhardinge return err; 15850d160211SJeremy Fitzhardinge } 15860d160211SJeremy Fitzhardinge 15872688fcb7SAndrew J. Bennieston /* Queue-specific initialisation 15882688fcb7SAndrew J. Bennieston * This used to be done in xennet_create_dev() but must now 15892688fcb7SAndrew J. Bennieston * be run per-queue. 15902688fcb7SAndrew J. Bennieston */ 15912688fcb7SAndrew J. Bennieston static int xennet_init_queue(struct netfront_queue *queue) 15922688fcb7SAndrew J. Bennieston { 15932688fcb7SAndrew J. Bennieston unsigned short i; 15942688fcb7SAndrew J. Bennieston int err = 0; 15952688fcb7SAndrew J. Bennieston 15962688fcb7SAndrew J. Bennieston spin_lock_init(&queue->tx_lock); 15972688fcb7SAndrew J. Bennieston spin_lock_init(&queue->rx_lock); 15982688fcb7SAndrew J. Bennieston 1599493be55aSVaishali Thakkar setup_timer(&queue->rx_refill_timer, rx_refill_timeout, 1600493be55aSVaishali Thakkar (unsigned long)queue); 16012688fcb7SAndrew J. Bennieston 16028b715010SWei Liu snprintf(queue->name, sizeof(queue->name), "%s-q%u", 16038b715010SWei Liu queue->info->netdev->name, queue->id); 16048b715010SWei Liu 16052688fcb7SAndrew J. Bennieston /* Initialise tx_skbs as a free chain containing every entry. */ 16062688fcb7SAndrew J. Bennieston queue->tx_skb_freelist = 0; 16072688fcb7SAndrew J. Bennieston for (i = 0; i < NET_TX_RING_SIZE; i++) { 16082688fcb7SAndrew J. Bennieston skb_entry_set_link(&queue->tx_skbs[i], i+1); 16092688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 16102688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 16112688fcb7SAndrew J. Bennieston } 16122688fcb7SAndrew J. Bennieston 16132688fcb7SAndrew J. Bennieston /* Clear out rx_skbs */ 16142688fcb7SAndrew J. Bennieston for (i = 0; i < NET_RX_RING_SIZE; i++) { 16152688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 16162688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 16172688fcb7SAndrew J. Bennieston } 16182688fcb7SAndrew J. Bennieston 16192688fcb7SAndrew J. Bennieston /* A grant for every tx ring slot */ 16201f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, 16212688fcb7SAndrew J. Bennieston &queue->gref_tx_head) < 0) { 16222688fcb7SAndrew J. Bennieston pr_alert("can't alloc tx grant refs\n"); 16232688fcb7SAndrew J. Bennieston err = -ENOMEM; 16242688fcb7SAndrew J. Bennieston goto exit; 16252688fcb7SAndrew J. Bennieston } 16262688fcb7SAndrew J. Bennieston 16272688fcb7SAndrew J. Bennieston /* A grant for every rx ring slot */ 16281f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, 16292688fcb7SAndrew J. Bennieston &queue->gref_rx_head) < 0) { 16302688fcb7SAndrew J. Bennieston pr_alert("can't alloc rx grant refs\n"); 16312688fcb7SAndrew J. Bennieston err = -ENOMEM; 16322688fcb7SAndrew J. Bennieston goto exit_free_tx; 16332688fcb7SAndrew J. Bennieston } 16342688fcb7SAndrew J. Bennieston 16352688fcb7SAndrew J. Bennieston return 0; 16362688fcb7SAndrew J. Bennieston 16372688fcb7SAndrew J. Bennieston exit_free_tx: 16382688fcb7SAndrew J. Bennieston gnttab_free_grant_references(queue->gref_tx_head); 16392688fcb7SAndrew J. Bennieston exit: 16402688fcb7SAndrew J. Bennieston return err; 16412688fcb7SAndrew J. Bennieston } 16422688fcb7SAndrew J. Bennieston 164350ee6061SAndrew J. Bennieston static int write_queue_xenstore_keys(struct netfront_queue *queue, 164450ee6061SAndrew J. Bennieston struct xenbus_transaction *xbt, int write_hierarchical) 164550ee6061SAndrew J. Bennieston { 164650ee6061SAndrew J. Bennieston /* Write the queue-specific keys into XenStore in the traditional 164750ee6061SAndrew J. Bennieston * way for a single queue, or in a queue subkeys for multiple 164850ee6061SAndrew J. Bennieston * queues. 164950ee6061SAndrew J. Bennieston */ 165050ee6061SAndrew J. Bennieston struct xenbus_device *dev = queue->info->xbdev; 165150ee6061SAndrew J. Bennieston int err; 165250ee6061SAndrew J. Bennieston const char *message; 165350ee6061SAndrew J. Bennieston char *path; 165450ee6061SAndrew J. Bennieston size_t pathsize; 165550ee6061SAndrew J. Bennieston 165650ee6061SAndrew J. Bennieston /* Choose the correct place to write the keys */ 165750ee6061SAndrew J. Bennieston if (write_hierarchical) { 165850ee6061SAndrew J. Bennieston pathsize = strlen(dev->nodename) + 10; 165950ee6061SAndrew J. Bennieston path = kzalloc(pathsize, GFP_KERNEL); 166050ee6061SAndrew J. Bennieston if (!path) { 166150ee6061SAndrew J. Bennieston err = -ENOMEM; 166250ee6061SAndrew J. Bennieston message = "out of memory while writing ring references"; 166350ee6061SAndrew J. Bennieston goto error; 166450ee6061SAndrew J. Bennieston } 166550ee6061SAndrew J. Bennieston snprintf(path, pathsize, "%s/queue-%u", 166650ee6061SAndrew J. Bennieston dev->nodename, queue->id); 166750ee6061SAndrew J. Bennieston } else { 166850ee6061SAndrew J. Bennieston path = (char *)dev->nodename; 166950ee6061SAndrew J. Bennieston } 167050ee6061SAndrew J. Bennieston 167150ee6061SAndrew J. Bennieston /* Write ring references */ 167250ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", 167350ee6061SAndrew J. Bennieston queue->tx_ring_ref); 167450ee6061SAndrew J. Bennieston if (err) { 167550ee6061SAndrew J. Bennieston message = "writing tx-ring-ref"; 167650ee6061SAndrew J. Bennieston goto error; 167750ee6061SAndrew J. Bennieston } 167850ee6061SAndrew J. Bennieston 167950ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", 168050ee6061SAndrew J. Bennieston queue->rx_ring_ref); 168150ee6061SAndrew J. Bennieston if (err) { 168250ee6061SAndrew J. Bennieston message = "writing rx-ring-ref"; 168350ee6061SAndrew J. Bennieston goto error; 168450ee6061SAndrew J. Bennieston } 168550ee6061SAndrew J. Bennieston 168650ee6061SAndrew J. Bennieston /* Write event channels; taking into account both shared 168750ee6061SAndrew J. Bennieston * and split event channel scenarios. 168850ee6061SAndrew J. Bennieston */ 168950ee6061SAndrew J. Bennieston if (queue->tx_evtchn == queue->rx_evtchn) { 169050ee6061SAndrew J. Bennieston /* Shared event channel */ 169150ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 169250ee6061SAndrew J. Bennieston "event-channel", "%u", queue->tx_evtchn); 169350ee6061SAndrew J. Bennieston if (err) { 169450ee6061SAndrew J. Bennieston message = "writing event-channel"; 169550ee6061SAndrew J. Bennieston goto error; 169650ee6061SAndrew J. Bennieston } 169750ee6061SAndrew J. Bennieston } else { 169850ee6061SAndrew J. Bennieston /* Split event channels */ 169950ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 170050ee6061SAndrew J. Bennieston "event-channel-tx", "%u", queue->tx_evtchn); 170150ee6061SAndrew J. Bennieston if (err) { 170250ee6061SAndrew J. Bennieston message = "writing event-channel-tx"; 170350ee6061SAndrew J. Bennieston goto error; 170450ee6061SAndrew J. Bennieston } 170550ee6061SAndrew J. Bennieston 170650ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 170750ee6061SAndrew J. Bennieston "event-channel-rx", "%u", queue->rx_evtchn); 170850ee6061SAndrew J. Bennieston if (err) { 170950ee6061SAndrew J. Bennieston message = "writing event-channel-rx"; 171050ee6061SAndrew J. Bennieston goto error; 171150ee6061SAndrew J. Bennieston } 171250ee6061SAndrew J. Bennieston } 171350ee6061SAndrew J. Bennieston 171450ee6061SAndrew J. Bennieston if (write_hierarchical) 171550ee6061SAndrew J. Bennieston kfree(path); 171650ee6061SAndrew J. Bennieston return 0; 171750ee6061SAndrew J. Bennieston 171850ee6061SAndrew J. Bennieston error: 171950ee6061SAndrew J. Bennieston if (write_hierarchical) 172050ee6061SAndrew J. Bennieston kfree(path); 172150ee6061SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "%s", message); 172250ee6061SAndrew J. Bennieston return err; 172350ee6061SAndrew J. Bennieston } 172450ee6061SAndrew J. Bennieston 1725ce58725fSDavid Vrabel static void xennet_destroy_queues(struct netfront_info *info) 1726ce58725fSDavid Vrabel { 1727ce58725fSDavid Vrabel unsigned int i; 1728ce58725fSDavid Vrabel 1729ce58725fSDavid Vrabel rtnl_lock(); 1730ce58725fSDavid Vrabel 1731ce58725fSDavid Vrabel for (i = 0; i < info->netdev->real_num_tx_queues; i++) { 1732ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 1733ce58725fSDavid Vrabel 1734ce58725fSDavid Vrabel if (netif_running(info->netdev)) 1735ce58725fSDavid Vrabel napi_disable(&queue->napi); 1736ad068118SDavid Vrabel del_timer_sync(&queue->rx_refill_timer); 1737ce58725fSDavid Vrabel netif_napi_del(&queue->napi); 1738ce58725fSDavid Vrabel } 1739ce58725fSDavid Vrabel 1740ce58725fSDavid Vrabel rtnl_unlock(); 1741ce58725fSDavid Vrabel 1742ce58725fSDavid Vrabel kfree(info->queues); 1743ce58725fSDavid Vrabel info->queues = NULL; 1744ce58725fSDavid Vrabel } 1745ce58725fSDavid Vrabel 1746ce58725fSDavid Vrabel static int xennet_create_queues(struct netfront_info *info, 1747ca88ea12SJoe Jin unsigned int *num_queues) 1748ce58725fSDavid Vrabel { 1749ce58725fSDavid Vrabel unsigned int i; 1750ce58725fSDavid Vrabel int ret; 1751ce58725fSDavid Vrabel 1752ca88ea12SJoe Jin info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), 1753ce58725fSDavid Vrabel GFP_KERNEL); 1754ce58725fSDavid Vrabel if (!info->queues) 1755ce58725fSDavid Vrabel return -ENOMEM; 1756ce58725fSDavid Vrabel 1757ce58725fSDavid Vrabel rtnl_lock(); 1758ce58725fSDavid Vrabel 1759ca88ea12SJoe Jin for (i = 0; i < *num_queues; i++) { 1760ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 1761ce58725fSDavid Vrabel 1762ce58725fSDavid Vrabel queue->id = i; 1763ce58725fSDavid Vrabel queue->info = info; 1764ce58725fSDavid Vrabel 1765ce58725fSDavid Vrabel ret = xennet_init_queue(queue); 1766ce58725fSDavid Vrabel if (ret < 0) { 176769cb8524SDavid Vrabel dev_warn(&info->netdev->dev, 176869cb8524SDavid Vrabel "only created %d queues\n", i); 1769ca88ea12SJoe Jin *num_queues = i; 1770ce58725fSDavid Vrabel break; 1771ce58725fSDavid Vrabel } 1772ce58725fSDavid Vrabel 1773ce58725fSDavid Vrabel netif_napi_add(queue->info->netdev, &queue->napi, 1774ce58725fSDavid Vrabel xennet_poll, 64); 1775ce58725fSDavid Vrabel if (netif_running(info->netdev)) 1776ce58725fSDavid Vrabel napi_enable(&queue->napi); 1777ce58725fSDavid Vrabel } 1778ce58725fSDavid Vrabel 1779ca88ea12SJoe Jin netif_set_real_num_tx_queues(info->netdev, *num_queues); 1780ce58725fSDavid Vrabel 1781ce58725fSDavid Vrabel rtnl_unlock(); 1782ce58725fSDavid Vrabel 1783ca88ea12SJoe Jin if (*num_queues == 0) { 1784ce58725fSDavid Vrabel dev_err(&info->netdev->dev, "no queues\n"); 1785ce58725fSDavid Vrabel return -EINVAL; 1786ce58725fSDavid Vrabel } 1787ce58725fSDavid Vrabel return 0; 1788ce58725fSDavid Vrabel } 1789ce58725fSDavid Vrabel 17900d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 1791f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 17920d160211SJeremy Fitzhardinge struct netfront_info *info) 17930d160211SJeremy Fitzhardinge { 17940d160211SJeremy Fitzhardinge const char *message; 17950d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 17960d160211SJeremy Fitzhardinge int err; 17972688fcb7SAndrew J. Bennieston unsigned int feature_split_evtchn; 17982688fcb7SAndrew J. Bennieston unsigned int i = 0; 179950ee6061SAndrew J. Bennieston unsigned int max_queues = 0; 18002688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 18012688fcb7SAndrew J. Bennieston unsigned int num_queues = 1; 18020d160211SJeremy Fitzhardinge 18032688fcb7SAndrew J. Bennieston info->netdev->irq = 0; 18042688fcb7SAndrew J. Bennieston 180550ee6061SAndrew J. Bennieston /* Check if backend supports multiple queues */ 18062890ea5cSJuergen Gross max_queues = xenbus_read_unsigned(info->xbdev->otherend, 18072890ea5cSJuergen Gross "multi-queue-max-queues", 1); 180850ee6061SAndrew J. Bennieston num_queues = min(max_queues, xennet_max_queues); 180950ee6061SAndrew J. Bennieston 18102688fcb7SAndrew J. Bennieston /* Check feature-split-event-channels */ 18112890ea5cSJuergen Gross feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, 18122890ea5cSJuergen Gross "feature-split-event-channels", 0); 18132688fcb7SAndrew J. Bennieston 18142688fcb7SAndrew J. Bennieston /* Read mac addr. */ 18152688fcb7SAndrew J. Bennieston err = xen_net_read_mac(dev, info->netdev->dev_addr); 18162688fcb7SAndrew J. Bennieston if (err) { 18172688fcb7SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 18180d160211SJeremy Fitzhardinge goto out; 18192688fcb7SAndrew J. Bennieston } 18202688fcb7SAndrew J. Bennieston 1821ce58725fSDavid Vrabel if (info->queues) 1822ce58725fSDavid Vrabel xennet_destroy_queues(info); 1823ce58725fSDavid Vrabel 1824ca88ea12SJoe Jin err = xennet_create_queues(info, &num_queues); 1825ce58725fSDavid Vrabel if (err < 0) 1826ce58725fSDavid Vrabel goto destroy_ring; 18272688fcb7SAndrew J. Bennieston 18282688fcb7SAndrew J. Bennieston /* Create shared ring, alloc event channel -- for each queue */ 18292688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 18302688fcb7SAndrew J. Bennieston queue = &info->queues[i]; 18312688fcb7SAndrew J. Bennieston err = setup_netfront(dev, queue, feature_split_evtchn); 18322688fcb7SAndrew J. Bennieston if (err) { 1833ce58725fSDavid Vrabel /* setup_netfront() will tidy up the current 1834ce58725fSDavid Vrabel * queue on error, but we need to clean up 18352688fcb7SAndrew J. Bennieston * those already allocated. 18362688fcb7SAndrew J. Bennieston */ 18372688fcb7SAndrew J. Bennieston if (i > 0) { 18382688fcb7SAndrew J. Bennieston rtnl_lock(); 18392688fcb7SAndrew J. Bennieston netif_set_real_num_tx_queues(info->netdev, i); 18402688fcb7SAndrew J. Bennieston rtnl_unlock(); 18412688fcb7SAndrew J. Bennieston goto destroy_ring; 18422688fcb7SAndrew J. Bennieston } else { 18432688fcb7SAndrew J. Bennieston goto out; 18442688fcb7SAndrew J. Bennieston } 18452688fcb7SAndrew J. Bennieston } 18462688fcb7SAndrew J. Bennieston } 18470d160211SJeremy Fitzhardinge 18480d160211SJeremy Fitzhardinge again: 18490d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 18500d160211SJeremy Fitzhardinge if (err) { 18510d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 18520d160211SJeremy Fitzhardinge goto destroy_ring; 18530d160211SJeremy Fitzhardinge } 18540d160211SJeremy Fitzhardinge 1855812494d9Schas williams if (xenbus_exists(XBT_NIL, 1856812494d9Schas williams info->xbdev->otherend, "multi-queue-max-queues")) { 1857812494d9Schas williams /* Write the number of queues */ 1858812494d9Schas williams err = xenbus_printf(xbt, dev->nodename, 1859812494d9Schas williams "multi-queue-num-queues", "%u", num_queues); 1860812494d9Schas williams if (err) { 1861812494d9Schas williams message = "writing multi-queue-num-queues"; 1862812494d9Schas williams goto abort_transaction_no_dev_fatal; 1863812494d9Schas williams } 1864812494d9Schas williams } 1865812494d9Schas williams 186650ee6061SAndrew J. Bennieston if (num_queues == 1) { 186750ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ 186850ee6061SAndrew J. Bennieston if (err) 186950ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 1870d634bf2cSWei Liu } else { 187150ee6061SAndrew J. Bennieston /* Write the keys for each queue */ 187250ee6061SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 187350ee6061SAndrew J. Bennieston queue = &info->queues[i]; 187450ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ 187550ee6061SAndrew J. Bennieston if (err) 187650ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 1877d634bf2cSWei Liu } 1878d634bf2cSWei Liu } 18790d160211SJeremy Fitzhardinge 188050ee6061SAndrew J. Bennieston /* The remaining keys are not queue-specific */ 18810d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 18820d160211SJeremy Fitzhardinge 1); 18830d160211SJeremy Fitzhardinge if (err) { 18840d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 18850d160211SJeremy Fitzhardinge goto abort_transaction; 18860d160211SJeremy Fitzhardinge } 18870d160211SJeremy Fitzhardinge 18880d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 18890d160211SJeremy Fitzhardinge if (err) { 18900d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 18910d160211SJeremy Fitzhardinge goto abort_transaction; 18920d160211SJeremy Fitzhardinge } 18930d160211SJeremy Fitzhardinge 18940d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 18950d160211SJeremy Fitzhardinge if (err) { 18960d160211SJeremy Fitzhardinge message = "writing feature-sg"; 18970d160211SJeremy Fitzhardinge goto abort_transaction; 18980d160211SJeremy Fitzhardinge } 18990d160211SJeremy Fitzhardinge 19000d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 19010d160211SJeremy Fitzhardinge if (err) { 19020d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 19030d160211SJeremy Fitzhardinge goto abort_transaction; 19040d160211SJeremy Fitzhardinge } 19050d160211SJeremy Fitzhardinge 19062c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); 19072c0057deSPaul Durrant if (err) { 19082c0057deSPaul Durrant message = "writing feature-gso-tcpv6"; 19092c0057deSPaul Durrant goto abort_transaction; 19102c0057deSPaul Durrant } 19112c0057deSPaul Durrant 19122c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", 19132c0057deSPaul Durrant "1"); 19142c0057deSPaul Durrant if (err) { 19152c0057deSPaul Durrant message = "writing feature-ipv6-csum-offload"; 19162c0057deSPaul Durrant goto abort_transaction; 19172c0057deSPaul Durrant } 19182c0057deSPaul Durrant 19190d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 19200d160211SJeremy Fitzhardinge if (err) { 19210d160211SJeremy Fitzhardinge if (err == -EAGAIN) 19220d160211SJeremy Fitzhardinge goto again; 19230d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 19240d160211SJeremy Fitzhardinge goto destroy_ring; 19250d160211SJeremy Fitzhardinge } 19260d160211SJeremy Fitzhardinge 19270d160211SJeremy Fitzhardinge return 0; 19280d160211SJeremy Fitzhardinge 19290d160211SJeremy Fitzhardinge abort_transaction: 19300d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 193150ee6061SAndrew J. Bennieston abort_transaction_no_dev_fatal: 193250ee6061SAndrew J. Bennieston xenbus_transaction_end(xbt, 1); 19330d160211SJeremy Fitzhardinge destroy_ring: 19340d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 19352688fcb7SAndrew J. Bennieston kfree(info->queues); 19362688fcb7SAndrew J. Bennieston info->queues = NULL; 19370d160211SJeremy Fitzhardinge out: 19380d160211SJeremy Fitzhardinge return err; 19390d160211SJeremy Fitzhardinge } 19400d160211SJeremy Fitzhardinge 19410d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 19420d160211SJeremy Fitzhardinge { 19430d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 19442688fcb7SAndrew J. Bennieston unsigned int num_queues = 0; 1945a5b5dc3cSDavid Vrabel int err; 19462688fcb7SAndrew J. Bennieston unsigned int j = 0; 19472688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 19480d160211SJeremy Fitzhardinge 19492890ea5cSJuergen Gross if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { 19500d160211SJeremy Fitzhardinge dev_info(&dev->dev, 1951898eb71cSJoe Perches "backend does not support copying receive path\n"); 19520d160211SJeremy Fitzhardinge return -ENODEV; 19530d160211SJeremy Fitzhardinge } 19540d160211SJeremy Fitzhardinge 1955f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 19560d160211SJeremy Fitzhardinge if (err) 19570d160211SJeremy Fitzhardinge return err; 19580d160211SJeremy Fitzhardinge 19592688fcb7SAndrew J. Bennieston /* talk_to_netback() sets the correct number of queues */ 19602688fcb7SAndrew J. Bennieston num_queues = dev->real_num_tx_queues; 19612688fcb7SAndrew J. Bennieston 19621ba37c51SIan Campbell rtnl_lock(); 1963fb507934SMichał Mirosław netdev_update_features(dev); 19641ba37c51SIan Campbell rtnl_unlock(); 19650d160211SJeremy Fitzhardinge 19660d160211SJeremy Fitzhardinge /* 1967a5b5dc3cSDavid Vrabel * All public and private state should now be sane. Get 19680d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 19690d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 19700d160211SJeremy Fitzhardinge * packets. 19710d160211SJeremy Fitzhardinge */ 19720d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 19732688fcb7SAndrew J. Bennieston for (j = 0; j < num_queues; ++j) { 19742688fcb7SAndrew J. Bennieston queue = &np->queues[j]; 1975f50b4076SDavid Vrabel 19762688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 19772688fcb7SAndrew J. Bennieston if (queue->tx_irq != queue->rx_irq) 19782688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 19790d160211SJeremy Fitzhardinge 1980f50b4076SDavid Vrabel spin_lock_irq(&queue->tx_lock); 1981f50b4076SDavid Vrabel xennet_tx_buf_gc(queue); 19822688fcb7SAndrew J. Bennieston spin_unlock_irq(&queue->tx_lock); 1983f50b4076SDavid Vrabel 1984f50b4076SDavid Vrabel spin_lock_bh(&queue->rx_lock); 1985f50b4076SDavid Vrabel xennet_alloc_rx_buffers(queue); 19862688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 19872688fcb7SAndrew J. Bennieston } 19880d160211SJeremy Fitzhardinge 19890d160211SJeremy Fitzhardinge return 0; 19900d160211SJeremy Fitzhardinge } 19910d160211SJeremy Fitzhardinge 19920d160211SJeremy Fitzhardinge /** 19930d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 19940d160211SJeremy Fitzhardinge */ 1995f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 19960d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 19970d160211SJeremy Fitzhardinge { 19981b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 19990d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 20000d160211SJeremy Fitzhardinge 20010d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 20020d160211SJeremy Fitzhardinge 20030d160211SJeremy Fitzhardinge switch (backend_state) { 20040d160211SJeremy Fitzhardinge case XenbusStateInitialising: 20050d160211SJeremy Fitzhardinge case XenbusStateInitialised: 2006b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 2007b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 20080d160211SJeremy Fitzhardinge case XenbusStateUnknown: 20090d160211SJeremy Fitzhardinge break; 20100d160211SJeremy Fitzhardinge 20110d160211SJeremy Fitzhardinge case XenbusStateInitWait: 20120d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 20130d160211SJeremy Fitzhardinge break; 20140d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 20150d160211SJeremy Fitzhardinge break; 20160d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 201708e34eb1SLaszlo Ersek break; 201808e34eb1SLaszlo Ersek 201908e34eb1SLaszlo Ersek case XenbusStateConnected: 2020ee89bab1SAmerigo Wang netdev_notify_peers(netdev); 20210d160211SJeremy Fitzhardinge break; 20220d160211SJeremy Fitzhardinge 2023bce3ea81SDavid Vrabel case XenbusStateClosed: 2024bce3ea81SDavid Vrabel if (dev->state == XenbusStateClosed) 2025bce3ea81SDavid Vrabel break; 2026bce3ea81SDavid Vrabel /* Missed the backend's CLOSING state -- fallthrough */ 20270d160211SJeremy Fitzhardinge case XenbusStateClosing: 20280d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 20290d160211SJeremy Fitzhardinge break; 20300d160211SJeremy Fitzhardinge } 20310d160211SJeremy Fitzhardinge } 20320d160211SJeremy Fitzhardinge 2033e0ce4af9SIan Campbell static const struct xennet_stat { 2034e0ce4af9SIan Campbell char name[ETH_GSTRING_LEN]; 2035e0ce4af9SIan Campbell u16 offset; 2036e0ce4af9SIan Campbell } xennet_stats[] = { 2037e0ce4af9SIan Campbell { 2038e0ce4af9SIan Campbell "rx_gso_checksum_fixup", 2039e0ce4af9SIan Campbell offsetof(struct netfront_info, rx_gso_checksum_fixup) 2040e0ce4af9SIan Campbell }, 2041e0ce4af9SIan Campbell }; 2042e0ce4af9SIan Campbell 2043e0ce4af9SIan Campbell static int xennet_get_sset_count(struct net_device *dev, int string_set) 2044e0ce4af9SIan Campbell { 2045e0ce4af9SIan Campbell switch (string_set) { 2046e0ce4af9SIan Campbell case ETH_SS_STATS: 2047e0ce4af9SIan Campbell return ARRAY_SIZE(xennet_stats); 2048e0ce4af9SIan Campbell default: 2049e0ce4af9SIan Campbell return -EINVAL; 2050e0ce4af9SIan Campbell } 2051e0ce4af9SIan Campbell } 2052e0ce4af9SIan Campbell 2053e0ce4af9SIan Campbell static void xennet_get_ethtool_stats(struct net_device *dev, 2054e0ce4af9SIan Campbell struct ethtool_stats *stats, u64 * data) 2055e0ce4af9SIan Campbell { 2056e0ce4af9SIan Campbell void *np = netdev_priv(dev); 2057e0ce4af9SIan Campbell int i; 2058e0ce4af9SIan Campbell 2059e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 20602688fcb7SAndrew J. Bennieston data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); 2061e0ce4af9SIan Campbell } 2062e0ce4af9SIan Campbell 2063e0ce4af9SIan Campbell static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) 2064e0ce4af9SIan Campbell { 2065e0ce4af9SIan Campbell int i; 2066e0ce4af9SIan Campbell 2067e0ce4af9SIan Campbell switch (stringset) { 2068e0ce4af9SIan Campbell case ETH_SS_STATS: 2069e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 2070e0ce4af9SIan Campbell memcpy(data + i * ETH_GSTRING_LEN, 2071e0ce4af9SIan Campbell xennet_stats[i].name, ETH_GSTRING_LEN); 2072e0ce4af9SIan Campbell break; 2073e0ce4af9SIan Campbell } 2074e0ce4af9SIan Campbell } 2075e0ce4af9SIan Campbell 20760fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 20770d160211SJeremy Fitzhardinge { 20780d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 2079e0ce4af9SIan Campbell 2080e0ce4af9SIan Campbell .get_sset_count = xennet_get_sset_count, 2081e0ce4af9SIan Campbell .get_ethtool_stats = xennet_get_ethtool_stats, 2082e0ce4af9SIan Campbell .get_strings = xennet_get_strings, 20830d160211SJeremy Fitzhardinge }; 20840d160211SJeremy Fitzhardinge 20850d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 20861f3c2ebaSDavid Vrabel static ssize_t show_rxbuf(struct device *dev, 20870d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 20880d160211SJeremy Fitzhardinge { 20891f3c2ebaSDavid Vrabel return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); 20900d160211SJeremy Fitzhardinge } 20910d160211SJeremy Fitzhardinge 20921f3c2ebaSDavid Vrabel static ssize_t store_rxbuf(struct device *dev, 20930d160211SJeremy Fitzhardinge struct device_attribute *attr, 20940d160211SJeremy Fitzhardinge const char *buf, size_t len) 20950d160211SJeremy Fitzhardinge { 20960d160211SJeremy Fitzhardinge char *endp; 20970d160211SJeremy Fitzhardinge unsigned long target; 20980d160211SJeremy Fitzhardinge 20990d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 21000d160211SJeremy Fitzhardinge return -EPERM; 21010d160211SJeremy Fitzhardinge 21020d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 21030d160211SJeremy Fitzhardinge if (endp == buf) 21040d160211SJeremy Fitzhardinge return -EBADMSG; 21050d160211SJeremy Fitzhardinge 21061f3c2ebaSDavid Vrabel /* rxbuf_min and rxbuf_max are no longer configurable. */ 21070d160211SJeremy Fitzhardinge 21080d160211SJeremy Fitzhardinge return len; 21090d160211SJeremy Fitzhardinge } 21100d160211SJeremy Fitzhardinge 211127b917e5STakashi Iwai static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); 211227b917e5STakashi Iwai static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); 211327b917e5STakashi Iwai static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL); 211427b917e5STakashi Iwai 211527b917e5STakashi Iwai static struct attribute *xennet_dev_attrs[] = { 211627b917e5STakashi Iwai &dev_attr_rxbuf_min.attr, 211727b917e5STakashi Iwai &dev_attr_rxbuf_max.attr, 211827b917e5STakashi Iwai &dev_attr_rxbuf_cur.attr, 211927b917e5STakashi Iwai NULL 21200d160211SJeremy Fitzhardinge }; 21210d160211SJeremy Fitzhardinge 212227b917e5STakashi Iwai static const struct attribute_group xennet_dev_group = { 212327b917e5STakashi Iwai .attrs = xennet_dev_attrs 212427b917e5STakashi Iwai }; 21250d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 21260d160211SJeremy Fitzhardinge 21278e0e46bbSBill Pemberton static int xennet_remove(struct xenbus_device *dev) 21280d160211SJeremy Fitzhardinge { 21291b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 21300d160211SJeremy Fitzhardinge 21310d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 21320d160211SJeremy Fitzhardinge 21330d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 21340d160211SJeremy Fitzhardinge 21356bc96d04SIan Campbell unregister_netdev(info->netdev); 21366bc96d04SIan Campbell 21379a873c71SChas Williams if (info->queues) 2138ad068118SDavid Vrabel xennet_destroy_queues(info); 2139900e1833SDavid Vrabel xennet_free_netdev(info->netdev); 21400d160211SJeremy Fitzhardinge 21410d160211SJeremy Fitzhardinge return 0; 21420d160211SJeremy Fitzhardinge } 21430d160211SJeremy Fitzhardinge 214495afae48SDavid Vrabel static const struct xenbus_device_id netfront_ids[] = { 214595afae48SDavid Vrabel { "vif" }, 214695afae48SDavid Vrabel { "" } 214795afae48SDavid Vrabel }; 214895afae48SDavid Vrabel 214995afae48SDavid Vrabel static struct xenbus_driver netfront_driver = { 215095afae48SDavid Vrabel .ids = netfront_ids, 21510d160211SJeremy Fitzhardinge .probe = netfront_probe, 21528e0e46bbSBill Pemberton .remove = xennet_remove, 21530d160211SJeremy Fitzhardinge .resume = netfront_resume, 2154f502bf2bSIan Campbell .otherend_changed = netback_changed, 215595afae48SDavid Vrabel }; 21560d160211SJeremy Fitzhardinge 21570d160211SJeremy Fitzhardinge static int __init netif_init(void) 21580d160211SJeremy Fitzhardinge { 21596e833587SJeremy Fitzhardinge if (!xen_domain()) 21600d160211SJeremy Fitzhardinge return -ENODEV; 21610d160211SJeremy Fitzhardinge 216251c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_nic_devices()) 2163b9136d20SIgor Mammedov return -ENODEV; 2164b9136d20SIgor Mammedov 2165383eda32SJoe Perches pr_info("Initialising Xen virtual ethernet driver\n"); 21660d160211SJeremy Fitzhardinge 216732a84405SWei Liu /* Allow as many queues as there are CPUs if user has not 216832a84405SWei Liu * specified a value. 216932a84405SWei Liu */ 217032a84405SWei Liu if (xennet_max_queues == 0) 217150ee6061SAndrew J. Bennieston xennet_max_queues = num_online_cpus(); 217250ee6061SAndrew J. Bennieston 2173ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 21740d160211SJeremy Fitzhardinge } 21750d160211SJeremy Fitzhardinge module_init(netif_init); 21760d160211SJeremy Fitzhardinge 21770d160211SJeremy Fitzhardinge 21780d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 21790d160211SJeremy Fitzhardinge { 2180ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 21810d160211SJeremy Fitzhardinge } 21820d160211SJeremy Fitzhardinge module_exit(netif_exit); 21830d160211SJeremy Fitzhardinge 21840d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 21850d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 2186d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 21874f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 2188