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 48ca981633SStefano Stabellini #include <asm/xen/page.h> 491ccbf534SJeremy Fitzhardinge #include <xen/xen.h> 500d160211SJeremy Fitzhardinge #include <xen/xenbus.h> 510d160211SJeremy Fitzhardinge #include <xen/events.h> 520d160211SJeremy Fitzhardinge #include <xen/page.h> 53b9136d20SIgor Mammedov #include <xen/platform_pci.h> 540d160211SJeremy Fitzhardinge #include <xen/grant_table.h> 550d160211SJeremy Fitzhardinge 560d160211SJeremy Fitzhardinge #include <xen/interface/io/netif.h> 570d160211SJeremy Fitzhardinge #include <xen/interface/memory.h> 580d160211SJeremy Fitzhardinge #include <xen/interface/grant_table.h> 590d160211SJeremy Fitzhardinge 6050ee6061SAndrew J. Bennieston /* Module parameters */ 6150ee6061SAndrew J. Bennieston static unsigned int xennet_max_queues; 6250ee6061SAndrew J. Bennieston module_param_named(max_queues, xennet_max_queues, uint, 0644); 6350ee6061SAndrew J. Bennieston MODULE_PARM_DESC(max_queues, 6450ee6061SAndrew J. Bennieston "Maximum number of queues per virtual interface"); 6550ee6061SAndrew J. Bennieston 660fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 670d160211SJeremy Fitzhardinge 680d160211SJeremy Fitzhardinge struct netfront_cb { 693683243bSIan Campbell int pull_to; 700d160211SJeremy Fitzhardinge }; 710d160211SJeremy Fitzhardinge 720d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 730d160211SJeremy Fitzhardinge 740d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 750d160211SJeremy Fitzhardinge 760d160211SJeremy Fitzhardinge #define GRANT_INVALID_REF 0 770d160211SJeremy Fitzhardinge 78667c78afSJeremy Fitzhardinge #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) 79667c78afSJeremy Fitzhardinge #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) 801f3c2ebaSDavid Vrabel 811f3c2ebaSDavid Vrabel /* Minimum number of Rx slots (includes slot for GSO metadata). */ 821f3c2ebaSDavid Vrabel #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) 830d160211SJeremy Fitzhardinge 842688fcb7SAndrew J. Bennieston /* Queue name is interface name with "-qNNN" appended */ 852688fcb7SAndrew J. Bennieston #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) 862688fcb7SAndrew J. Bennieston 872688fcb7SAndrew J. Bennieston /* IRQ name is queue name with "-tx" or "-rx" appended */ 882688fcb7SAndrew J. Bennieston #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) 892688fcb7SAndrew J. Bennieston 90e00f85beSstephen hemminger struct netfront_stats { 91900e1833SDavid Vrabel u64 packets; 92900e1833SDavid Vrabel u64 bytes; 93e00f85beSstephen hemminger struct u64_stats_sync syncp; 94e00f85beSstephen hemminger }; 95e00f85beSstephen hemminger 962688fcb7SAndrew J. Bennieston struct netfront_info; 972688fcb7SAndrew J. Bennieston 982688fcb7SAndrew J. Bennieston struct netfront_queue { 992688fcb7SAndrew J. Bennieston unsigned int id; /* Queue ID, 0-based */ 1002688fcb7SAndrew J. Bennieston char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ 1012688fcb7SAndrew J. Bennieston struct netfront_info *info; 1020d160211SJeremy Fitzhardinge 103bea3348eSStephen Hemminger struct napi_struct napi; 1040d160211SJeremy Fitzhardinge 105d634bf2cSWei Liu /* Split event channels support, tx_* == rx_* when using 106d634bf2cSWei Liu * single event channel. 107d634bf2cSWei Liu */ 108d634bf2cSWei Liu unsigned int tx_evtchn, rx_evtchn; 109d634bf2cSWei Liu unsigned int tx_irq, rx_irq; 110d634bf2cSWei Liu /* Only used when split event channels support is enabled */ 1112688fcb7SAndrew J. Bennieston char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ 1122688fcb7SAndrew J. Bennieston char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ 1130d160211SJeremy Fitzhardinge 1140d160211SJeremy Fitzhardinge spinlock_t tx_lock; 11584284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 11684284d3cSJeremy Fitzhardinge int tx_ring_ref; 1170d160211SJeremy Fitzhardinge 1180d160211SJeremy Fitzhardinge /* 1190d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 1200d160211SJeremy Fitzhardinge * are linked from tx_skb_freelist through skb_entry.link. 1210d160211SJeremy Fitzhardinge * 1220d160211SJeremy Fitzhardinge * NB. Freelist index entries are always going to be less than 1230d160211SJeremy Fitzhardinge * PAGE_OFFSET, whereas pointers to skbs will always be equal or 1240d160211SJeremy Fitzhardinge * greater than PAGE_OFFSET: we use this property to distinguish 1250d160211SJeremy Fitzhardinge * them. 1260d160211SJeremy Fitzhardinge */ 1270d160211SJeremy Fitzhardinge union skb_entry { 1280d160211SJeremy Fitzhardinge struct sk_buff *skb; 1291ffb40b8SIsaku Yamahata unsigned long link; 1300d160211SJeremy Fitzhardinge } tx_skbs[NET_TX_RING_SIZE]; 1310d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1320d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 133cefe0078SAnnie Li struct page *grant_tx_page[NET_TX_RING_SIZE]; 1340d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 1350d160211SJeremy Fitzhardinge 13684284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 13784284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 13884284d3cSJeremy Fitzhardinge int rx_ring_ref; 13984284d3cSJeremy Fitzhardinge 14084284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 14184284d3cSJeremy Fitzhardinge 1420d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1430d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1440d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1452688fcb7SAndrew J. Bennieston }; 1462688fcb7SAndrew J. Bennieston 1472688fcb7SAndrew J. Bennieston struct netfront_info { 1482688fcb7SAndrew J. Bennieston struct list_head list; 1492688fcb7SAndrew J. Bennieston struct net_device *netdev; 1502688fcb7SAndrew J. Bennieston 1512688fcb7SAndrew J. Bennieston struct xenbus_device *xbdev; 1522688fcb7SAndrew J. Bennieston 1532688fcb7SAndrew J. Bennieston /* Multi-queue support */ 1542688fcb7SAndrew J. Bennieston struct netfront_queue *queues; 155e0ce4af9SIan Campbell 156e0ce4af9SIan Campbell /* Statistics */ 157900e1833SDavid Vrabel struct netfront_stats __percpu *rx_stats; 158900e1833SDavid Vrabel struct netfront_stats __percpu *tx_stats; 159e00f85beSstephen hemminger 1602688fcb7SAndrew J. Bennieston atomic_t rx_gso_checksum_fixup; 1610d160211SJeremy Fitzhardinge }; 1620d160211SJeremy Fitzhardinge 1630d160211SJeremy Fitzhardinge struct netfront_rx_info { 1640d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1650d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1660d160211SJeremy Fitzhardinge }; 1670d160211SJeremy Fitzhardinge 1681ffb40b8SIsaku Yamahata static void skb_entry_set_link(union skb_entry *list, unsigned short id) 1691ffb40b8SIsaku Yamahata { 1701ffb40b8SIsaku Yamahata list->link = id; 1711ffb40b8SIsaku Yamahata } 1721ffb40b8SIsaku Yamahata 1731ffb40b8SIsaku Yamahata static int skb_entry_is_link(const union skb_entry *list) 1741ffb40b8SIsaku Yamahata { 1751ffb40b8SIsaku Yamahata BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); 176807540baSEric Dumazet return (unsigned long)list->skb < PAGE_OFFSET; 1771ffb40b8SIsaku Yamahata } 1781ffb40b8SIsaku Yamahata 1790d160211SJeremy Fitzhardinge /* 1800d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1810d160211SJeremy Fitzhardinge */ 1820d160211SJeremy Fitzhardinge 1830d160211SJeremy Fitzhardinge static void add_id_to_freelist(unsigned *head, union skb_entry *list, 1840d160211SJeremy Fitzhardinge unsigned short id) 1850d160211SJeremy Fitzhardinge { 1861ffb40b8SIsaku Yamahata skb_entry_set_link(&list[id], *head); 1870d160211SJeremy Fitzhardinge *head = id; 1880d160211SJeremy Fitzhardinge } 1890d160211SJeremy Fitzhardinge 1900d160211SJeremy Fitzhardinge static unsigned short get_id_from_freelist(unsigned *head, 1910d160211SJeremy Fitzhardinge union skb_entry *list) 1920d160211SJeremy Fitzhardinge { 1930d160211SJeremy Fitzhardinge unsigned int id = *head; 1940d160211SJeremy Fitzhardinge *head = list[id].link; 1950d160211SJeremy Fitzhardinge return id; 1960d160211SJeremy Fitzhardinge } 1970d160211SJeremy Fitzhardinge 1980d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 1990d160211SJeremy Fitzhardinge { 2000d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 2010d160211SJeremy Fitzhardinge } 2020d160211SJeremy Fitzhardinge 2032688fcb7SAndrew J. Bennieston static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, 2040d160211SJeremy Fitzhardinge RING_IDX ri) 2050d160211SJeremy Fitzhardinge { 2060d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2072688fcb7SAndrew J. Bennieston struct sk_buff *skb = queue->rx_skbs[i]; 2082688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 2090d160211SJeremy Fitzhardinge return skb; 2100d160211SJeremy Fitzhardinge } 2110d160211SJeremy Fitzhardinge 2122688fcb7SAndrew J. Bennieston static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, 2130d160211SJeremy Fitzhardinge RING_IDX ri) 2140d160211SJeremy Fitzhardinge { 2150d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2162688fcb7SAndrew J. Bennieston grant_ref_t ref = queue->grant_rx_ref[i]; 2172688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 2180d160211SJeremy Fitzhardinge return ref; 2190d160211SJeremy Fitzhardinge } 2200d160211SJeremy Fitzhardinge 2210d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 22227b917e5STakashi Iwai static const struct attribute_group xennet_dev_group; 2230d160211SJeremy Fitzhardinge #endif 2240d160211SJeremy Fitzhardinge 2253ad9b358SMichał Mirosław static bool xennet_can_sg(struct net_device *dev) 2260d160211SJeremy Fitzhardinge { 2273ad9b358SMichał Mirosław return dev->features & NETIF_F_SG; 2280d160211SJeremy Fitzhardinge } 2290d160211SJeremy Fitzhardinge 2300d160211SJeremy Fitzhardinge 2310d160211SJeremy Fitzhardinge static void rx_refill_timeout(unsigned long data) 2320d160211SJeremy Fitzhardinge { 2332688fcb7SAndrew J. Bennieston struct netfront_queue *queue = (struct netfront_queue *)data; 2342688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 2350d160211SJeremy Fitzhardinge } 2360d160211SJeremy Fitzhardinge 2372688fcb7SAndrew J. Bennieston static int netfront_tx_slot_available(struct netfront_queue *queue) 2380d160211SJeremy Fitzhardinge { 2392688fcb7SAndrew J. Bennieston return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < 2401f3c2ebaSDavid Vrabel (NET_TX_RING_SIZE - MAX_SKB_FRAGS - 2); 2410d160211SJeremy Fitzhardinge } 2420d160211SJeremy Fitzhardinge 2432688fcb7SAndrew J. Bennieston static void xennet_maybe_wake_tx(struct netfront_queue *queue) 2440d160211SJeremy Fitzhardinge { 2452688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 2462688fcb7SAndrew J. Bennieston struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); 2470d160211SJeremy Fitzhardinge 2482688fcb7SAndrew J. Bennieston if (unlikely(netif_tx_queue_stopped(dev_queue)) && 2492688fcb7SAndrew J. Bennieston netfront_tx_slot_available(queue) && 2500d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2512688fcb7SAndrew J. Bennieston netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); 2520d160211SJeremy Fitzhardinge } 2530d160211SJeremy Fitzhardinge 2541f3c2ebaSDavid Vrabel 2551f3c2ebaSDavid Vrabel static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) 2560d160211SJeremy Fitzhardinge { 2570d160211SJeremy Fitzhardinge struct sk_buff *skb; 2580d160211SJeremy Fitzhardinge struct page *page; 2590d160211SJeremy Fitzhardinge 2602688fcb7SAndrew J. Bennieston skb = __netdev_alloc_skb(queue->info->netdev, 2612688fcb7SAndrew J. Bennieston RX_COPY_THRESHOLD + NET_IP_ALIGN, 2620d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2630d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2641f3c2ebaSDavid Vrabel return NULL; 265617a20bbSIsaku Yamahata 2660d160211SJeremy Fitzhardinge page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); 2670d160211SJeremy Fitzhardinge if (!page) { 2680d160211SJeremy Fitzhardinge kfree_skb(skb); 2691f3c2ebaSDavid Vrabel return NULL; 2700d160211SJeremy Fitzhardinge } 271093b9c71SJan Beulich skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); 2720d160211SJeremy Fitzhardinge 2731f3c2ebaSDavid Vrabel /* Align ip header to a 16 bytes boundary */ 2741f3c2ebaSDavid Vrabel skb_reserve(skb, NET_IP_ALIGN); 2752688fcb7SAndrew J. Bennieston skb->dev = queue->info->netdev; 2760d160211SJeremy Fitzhardinge 2771f3c2ebaSDavid Vrabel return skb; 2781f3c2ebaSDavid Vrabel } 2791f3c2ebaSDavid Vrabel 2801f3c2ebaSDavid Vrabel 2811f3c2ebaSDavid Vrabel static void xennet_alloc_rx_buffers(struct netfront_queue *queue) 2821f3c2ebaSDavid Vrabel { 2831f3c2ebaSDavid Vrabel RING_IDX req_prod = queue->rx.req_prod_pvt; 2841f3c2ebaSDavid Vrabel int notify; 2851f3c2ebaSDavid Vrabel 2861f3c2ebaSDavid Vrabel if (unlikely(!netif_carrier_ok(queue->info->netdev))) 2871f3c2ebaSDavid Vrabel return; 2881f3c2ebaSDavid Vrabel 2891f3c2ebaSDavid Vrabel for (req_prod = queue->rx.req_prod_pvt; 2901f3c2ebaSDavid Vrabel req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; 2911f3c2ebaSDavid Vrabel req_prod++) { 2921f3c2ebaSDavid Vrabel struct sk_buff *skb; 2931f3c2ebaSDavid Vrabel unsigned short id; 2941f3c2ebaSDavid Vrabel grant_ref_t ref; 2951f3c2ebaSDavid Vrabel unsigned long pfn; 2961f3c2ebaSDavid Vrabel struct xen_netif_rx_request *req; 2971f3c2ebaSDavid Vrabel 2981f3c2ebaSDavid Vrabel skb = xennet_alloc_one_rx_buffer(queue); 2991f3c2ebaSDavid Vrabel if (!skb) 3001f3c2ebaSDavid Vrabel break; 3011f3c2ebaSDavid Vrabel 3021f3c2ebaSDavid Vrabel id = xennet_rxidx(req_prod); 3030d160211SJeremy Fitzhardinge 3042688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[id]); 3052688fcb7SAndrew J. Bennieston queue->rx_skbs[id] = skb; 3060d160211SJeremy Fitzhardinge 3072688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_rx_head); 3080d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 3092688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = ref; 3100d160211SJeremy Fitzhardinge 31101c68026SIan Campbell pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); 3120d160211SJeremy Fitzhardinge 3131f3c2ebaSDavid Vrabel req = RING_GET_REQUEST(&queue->rx, req_prod); 3140d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref(ref, 3152688fcb7SAndrew J. Bennieston queue->info->xbdev->otherend_id, 3160d160211SJeremy Fitzhardinge pfn_to_mfn(pfn), 3170d160211SJeremy Fitzhardinge 0); 3180d160211SJeremy Fitzhardinge 3190d160211SJeremy Fitzhardinge req->id = id; 3200d160211SJeremy Fitzhardinge req->gref = ref; 3210d160211SJeremy Fitzhardinge } 3220d160211SJeremy Fitzhardinge 3231f3c2ebaSDavid Vrabel queue->rx.req_prod_pvt = req_prod; 3241f3c2ebaSDavid Vrabel 3251f3c2ebaSDavid Vrabel /* Not enough requests? Try again later. */ 3261f3c2ebaSDavid Vrabel if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN) { 3271f3c2ebaSDavid Vrabel mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); 3281f3c2ebaSDavid Vrabel return; 3291f3c2ebaSDavid Vrabel } 3301f3c2ebaSDavid Vrabel 3310d160211SJeremy Fitzhardinge wmb(); /* barrier so backend seens requests */ 3320d160211SJeremy Fitzhardinge 3332688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); 3340d160211SJeremy Fitzhardinge if (notify) 3352688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 3360d160211SJeremy Fitzhardinge } 3370d160211SJeremy Fitzhardinge 3380d160211SJeremy Fitzhardinge static int xennet_open(struct net_device *dev) 3390d160211SJeremy Fitzhardinge { 3400d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3412688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 3422688fcb7SAndrew J. Bennieston unsigned int i = 0; 3432688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 3440d160211SJeremy Fitzhardinge 3452688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 3462688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 3472688fcb7SAndrew J. Bennieston napi_enable(&queue->napi); 348bea3348eSStephen Hemminger 3492688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 3500d160211SJeremy Fitzhardinge if (netif_carrier_ok(dev)) { 3512688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 3522688fcb7SAndrew J. Bennieston queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; 3532688fcb7SAndrew J. Bennieston if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) 3542688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 3550d160211SJeremy Fitzhardinge } 3562688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 3572688fcb7SAndrew J. Bennieston } 3580d160211SJeremy Fitzhardinge 3592688fcb7SAndrew J. Bennieston netif_tx_start_all_queues(dev); 3600d160211SJeremy Fitzhardinge 3610d160211SJeremy Fitzhardinge return 0; 3620d160211SJeremy Fitzhardinge } 3630d160211SJeremy Fitzhardinge 3642688fcb7SAndrew J. Bennieston static void xennet_tx_buf_gc(struct netfront_queue *queue) 3650d160211SJeremy Fitzhardinge { 3660d160211SJeremy Fitzhardinge RING_IDX cons, prod; 3670d160211SJeremy Fitzhardinge unsigned short id; 3680d160211SJeremy Fitzhardinge struct sk_buff *skb; 3690d160211SJeremy Fitzhardinge 3702688fcb7SAndrew J. Bennieston BUG_ON(!netif_carrier_ok(queue->info->netdev)); 3710d160211SJeremy Fitzhardinge 3720d160211SJeremy Fitzhardinge do { 3732688fcb7SAndrew J. Bennieston prod = queue->tx.sring->rsp_prod; 3740d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 3750d160211SJeremy Fitzhardinge 3762688fcb7SAndrew J. Bennieston for (cons = queue->tx.rsp_cons; cons != prod; cons++) { 3770d160211SJeremy Fitzhardinge struct xen_netif_tx_response *txrsp; 3780d160211SJeremy Fitzhardinge 3792688fcb7SAndrew J. Bennieston txrsp = RING_GET_RESPONSE(&queue->tx, cons); 380f942dc25SIan Campbell if (txrsp->status == XEN_NETIF_RSP_NULL) 3810d160211SJeremy Fitzhardinge continue; 3820d160211SJeremy Fitzhardinge 3830d160211SJeremy Fitzhardinge id = txrsp->id; 3842688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[id].skb; 3850d160211SJeremy Fitzhardinge if (unlikely(gnttab_query_foreign_access( 3862688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id]) != 0)) { 387383eda32SJoe Perches pr_alert("%s: warning -- grant still in use by backend domain\n", 388383eda32SJoe Perches __func__); 3890d160211SJeremy Fitzhardinge BUG(); 3900d160211SJeremy Fitzhardinge } 3910d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref( 3922688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id], GNTMAP_readonly); 3930d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 3942688fcb7SAndrew J. Bennieston &queue->gref_tx_head, queue->grant_tx_ref[id]); 3952688fcb7SAndrew J. Bennieston queue->grant_tx_ref[id] = GRANT_INVALID_REF; 3962688fcb7SAndrew J. Bennieston queue->grant_tx_page[id] = NULL; 3972688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id); 3980d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 3990d160211SJeremy Fitzhardinge } 4000d160211SJeremy Fitzhardinge 4012688fcb7SAndrew J. Bennieston queue->tx.rsp_cons = prod; 4020d160211SJeremy Fitzhardinge 4030d160211SJeremy Fitzhardinge /* 4040d160211SJeremy Fitzhardinge * Set a new event, then check for race with update of tx_cons. 4050d160211SJeremy Fitzhardinge * Note that it is essential to schedule a callback, no matter 4060d160211SJeremy Fitzhardinge * how few buffers are pending. Even if there is space in the 4070d160211SJeremy Fitzhardinge * transmit ring, higher layers may be blocked because too much 4080d160211SJeremy Fitzhardinge * data is outstanding: in such cases notification from Xen is 4090d160211SJeremy Fitzhardinge * likely to be the only kick that we'll get. 4100d160211SJeremy Fitzhardinge */ 4112688fcb7SAndrew J. Bennieston queue->tx.sring->rsp_event = 4122688fcb7SAndrew J. Bennieston prod + ((queue->tx.sring->req_prod - prod) >> 1) + 1; 4130d160211SJeremy Fitzhardinge mb(); /* update shared area */ 4142688fcb7SAndrew J. Bennieston } while ((cons == prod) && (prod != queue->tx.sring->rsp_prod)); 4150d160211SJeremy Fitzhardinge 4162688fcb7SAndrew J. Bennieston xennet_maybe_wake_tx(queue); 4170d160211SJeremy Fitzhardinge } 4180d160211SJeremy Fitzhardinge 419a55e8bb8SDavid Vrabel static struct xen_netif_tx_request *xennet_make_one_txreq( 420a55e8bb8SDavid Vrabel struct netfront_queue *queue, struct sk_buff *skb, 421a55e8bb8SDavid Vrabel struct page *page, unsigned int offset, unsigned int len) 4220d160211SJeremy Fitzhardinge { 4230d160211SJeremy Fitzhardinge unsigned int id; 424a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx; 4250d160211SJeremy Fitzhardinge grant_ref_t ref; 4260d160211SJeremy Fitzhardinge 427a55e8bb8SDavid Vrabel len = min_t(unsigned int, PAGE_SIZE - offset, len); 4280d160211SJeremy Fitzhardinge 4292688fcb7SAndrew J. Bennieston id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); 430a55e8bb8SDavid Vrabel tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 4312688fcb7SAndrew J. Bennieston ref = gnttab_claim_grant_reference(&queue->gref_tx_head); 4320d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 4330d160211SJeremy Fitzhardinge 4342688fcb7SAndrew J. Bennieston gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, 435a55e8bb8SDavid Vrabel page_to_mfn(page), GNTMAP_readonly); 4360d160211SJeremy Fitzhardinge 437a55e8bb8SDavid Vrabel queue->tx_skbs[id].skb = skb; 438a55e8bb8SDavid Vrabel queue->grant_tx_page[id] = page; 439a55e8bb8SDavid Vrabel queue->grant_tx_ref[id] = ref; 440a55e8bb8SDavid Vrabel 441a55e8bb8SDavid Vrabel tx->id = id; 442a55e8bb8SDavid Vrabel tx->gref = ref; 4430d160211SJeremy Fitzhardinge tx->offset = offset; 4440d160211SJeremy Fitzhardinge tx->size = len; 4450d160211SJeremy Fitzhardinge tx->flags = 0; 446a55e8bb8SDavid Vrabel 447a55e8bb8SDavid Vrabel return tx; 4480d160211SJeremy Fitzhardinge } 4490d160211SJeremy Fitzhardinge 450a55e8bb8SDavid Vrabel static struct xen_netif_tx_request *xennet_make_txreqs( 451a55e8bb8SDavid Vrabel struct netfront_queue *queue, struct xen_netif_tx_request *tx, 452a55e8bb8SDavid Vrabel struct sk_buff *skb, struct page *page, 453a55e8bb8SDavid Vrabel unsigned int offset, unsigned int len) 454a55e8bb8SDavid Vrabel { 455f36c3747SIan Campbell /* Skip unused frames from start of page */ 456f36c3747SIan Campbell page += offset >> PAGE_SHIFT; 457f36c3747SIan Campbell offset &= ~PAGE_MASK; 458f36c3747SIan Campbell 459a55e8bb8SDavid Vrabel while (len) { 460f942dc25SIan Campbell tx->flags |= XEN_NETTXF_more_data; 461a55e8bb8SDavid Vrabel tx = xennet_make_one_txreq(queue, skb_get(skb), 462a55e8bb8SDavid Vrabel page, offset, len); 463f36c3747SIan Campbell page++; 464f36c3747SIan Campbell offset = 0; 465a55e8bb8SDavid Vrabel len -= tx->size; 4660d160211SJeremy Fitzhardinge } 4670d160211SJeremy Fitzhardinge 468a55e8bb8SDavid Vrabel return tx; 4690d160211SJeremy Fitzhardinge } 4700d160211SJeremy Fitzhardinge 471f36c3747SIan Campbell /* 472e84448d5SDavid Vrabel * Count how many ring slots are required to send this skb. Each frag 473e84448d5SDavid Vrabel * might be a compound page. 474f36c3747SIan Campbell */ 475e84448d5SDavid Vrabel static int xennet_count_skb_slots(struct sk_buff *skb) 476f36c3747SIan Campbell { 477f36c3747SIan Campbell int i, frags = skb_shinfo(skb)->nr_frags; 478e84448d5SDavid Vrabel int pages; 479e84448d5SDavid Vrabel 480e84448d5SDavid Vrabel pages = PFN_UP(offset_in_page(skb->data) + skb_headlen(skb)); 481f36c3747SIan Campbell 482f36c3747SIan Campbell for (i = 0; i < frags; i++) { 483f36c3747SIan Campbell skb_frag_t *frag = skb_shinfo(skb)->frags + i; 484f36c3747SIan Campbell unsigned long size = skb_frag_size(frag); 485f36c3747SIan Campbell unsigned long offset = frag->page_offset; 486f36c3747SIan Campbell 487f36c3747SIan Campbell /* Skip unused frames from start of page */ 488f36c3747SIan Campbell offset &= ~PAGE_MASK; 489f36c3747SIan Campbell 490f36c3747SIan Campbell pages += PFN_UP(offset + size); 491f36c3747SIan Campbell } 492f36c3747SIan Campbell 493f36c3747SIan Campbell return pages; 494f36c3747SIan Campbell } 495f36c3747SIan Campbell 49650ee6061SAndrew J. Bennieston static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, 49750ee6061SAndrew J. Bennieston void *accel_priv, select_queue_fallback_t fallback) 4982688fcb7SAndrew J. Bennieston { 49950ee6061SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 50050ee6061SAndrew J. Bennieston u32 hash; 50150ee6061SAndrew J. Bennieston u16 queue_idx; 50250ee6061SAndrew J. Bennieston 50350ee6061SAndrew J. Bennieston /* First, check if there is only one queue */ 50450ee6061SAndrew J. Bennieston if (num_queues == 1) { 50550ee6061SAndrew J. Bennieston queue_idx = 0; 50650ee6061SAndrew J. Bennieston } else { 50750ee6061SAndrew J. Bennieston hash = skb_get_hash(skb); 50850ee6061SAndrew J. Bennieston queue_idx = hash % num_queues; 50950ee6061SAndrew J. Bennieston } 51050ee6061SAndrew J. Bennieston 51150ee6061SAndrew J. Bennieston return queue_idx; 5122688fcb7SAndrew J. Bennieston } 5132688fcb7SAndrew J. Bennieston 5140d160211SJeremy Fitzhardinge static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 5150d160211SJeremy Fitzhardinge { 5160d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 517900e1833SDavid Vrabel struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); 518a55e8bb8SDavid Vrabel struct xen_netif_tx_request *tx, *first_tx; 519a55e8bb8SDavid Vrabel unsigned int i; 5200d160211SJeremy Fitzhardinge int notify; 521f36c3747SIan Campbell int slots; 522a55e8bb8SDavid Vrabel struct page *page; 523a55e8bb8SDavid Vrabel unsigned int offset; 524a55e8bb8SDavid Vrabel unsigned int len; 525cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 5262688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 5272688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 5282688fcb7SAndrew J. Bennieston u16 queue_index; 5292688fcb7SAndrew J. Bennieston 5302688fcb7SAndrew J. Bennieston /* Drop the packet if no queues are set up */ 5312688fcb7SAndrew J. Bennieston if (num_queues < 1) 5322688fcb7SAndrew J. Bennieston goto drop; 5332688fcb7SAndrew J. Bennieston /* Determine which queue to transmit this SKB on */ 5342688fcb7SAndrew J. Bennieston queue_index = skb_get_queue_mapping(skb); 5352688fcb7SAndrew J. Bennieston queue = &np->queues[queue_index]; 5360d160211SJeremy Fitzhardinge 5379ecd1a75SWei Liu /* If skb->len is too big for wire format, drop skb and alert 5389ecd1a75SWei Liu * user about misconfiguration. 5399ecd1a75SWei Liu */ 5409ecd1a75SWei Liu if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { 5419ecd1a75SWei Liu net_alert_ratelimited( 5429ecd1a75SWei Liu "xennet: skb->len = %u, too big for wire format\n", 5439ecd1a75SWei Liu skb->len); 5449ecd1a75SWei Liu goto drop; 5459ecd1a75SWei Liu } 5469ecd1a75SWei Liu 547e84448d5SDavid Vrabel slots = xennet_count_skb_slots(skb); 548f36c3747SIan Campbell if (unlikely(slots > MAX_SKB_FRAGS + 1)) { 54997a6d1bbSZoltan Kiss net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", 55097a6d1bbSZoltan Kiss slots, skb->len); 55197a6d1bbSZoltan Kiss if (skb_linearize(skb)) 5520d160211SJeremy Fitzhardinge goto drop; 5530d160211SJeremy Fitzhardinge } 5540d160211SJeremy Fitzhardinge 555a55e8bb8SDavid Vrabel page = virt_to_page(skb->data); 556a55e8bb8SDavid Vrabel offset = offset_in_page(skb->data); 557a55e8bb8SDavid Vrabel len = skb_headlen(skb); 558a55e8bb8SDavid Vrabel 5592688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 5600d160211SJeremy Fitzhardinge 5610d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 562f36c3747SIan Campbell (slots > 1 && !xennet_can_sg(dev)) || 5638b86a61dSJohannes Berg netif_needs_gso(skb, netif_skb_features(skb)))) { 5642688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 5650d160211SJeremy Fitzhardinge goto drop; 5660d160211SJeremy Fitzhardinge } 5670d160211SJeremy Fitzhardinge 568a55e8bb8SDavid Vrabel /* First request for the linear area. */ 569a55e8bb8SDavid Vrabel first_tx = tx = xennet_make_one_txreq(queue, skb, 570a55e8bb8SDavid Vrabel page, offset, len); 571a55e8bb8SDavid Vrabel page++; 572a55e8bb8SDavid Vrabel offset = 0; 573a55e8bb8SDavid Vrabel len -= tx->size; 5740d160211SJeremy Fitzhardinge 5750d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 5760d160211SJeremy Fitzhardinge /* local packet? */ 577f942dc25SIan Campbell tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; 5780d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 5790d160211SJeremy Fitzhardinge /* remote but checksummed. */ 580f942dc25SIan Campbell tx->flags |= XEN_NETTXF_data_validated; 5810d160211SJeremy Fitzhardinge 582a55e8bb8SDavid Vrabel /* Optional extra info after the first request. */ 5830d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 5840d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 5850d160211SJeremy Fitzhardinge 5860d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 587a55e8bb8SDavid Vrabel RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); 5880d160211SJeremy Fitzhardinge 589f942dc25SIan Campbell tx->flags |= XEN_NETTXF_extra_info; 5900d160211SJeremy Fitzhardinge 5910d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 5922c0057deSPaul Durrant gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? 5932c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV6 : 5942c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV4; 5950d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 5960d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 5970d160211SJeremy Fitzhardinge 5980d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 5990d160211SJeremy Fitzhardinge gso->flags = 0; 6000d160211SJeremy Fitzhardinge } 6010d160211SJeremy Fitzhardinge 602a55e8bb8SDavid Vrabel /* Requests for the rest of the linear area. */ 603a55e8bb8SDavid Vrabel tx = xennet_make_txreqs(queue, tx, skb, page, offset, len); 6040d160211SJeremy Fitzhardinge 605a55e8bb8SDavid Vrabel /* Requests for all the frags. */ 606a55e8bb8SDavid Vrabel for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 607a55e8bb8SDavid Vrabel skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 608a55e8bb8SDavid Vrabel tx = xennet_make_txreqs(queue, tx, skb, 609a55e8bb8SDavid Vrabel skb_frag_page(frag), frag->page_offset, 610a55e8bb8SDavid Vrabel skb_frag_size(frag)); 611a55e8bb8SDavid Vrabel } 612a55e8bb8SDavid Vrabel 613a55e8bb8SDavid Vrabel /* First request has the packet length. */ 614a55e8bb8SDavid Vrabel first_tx->size = skb->len; 6150d160211SJeremy Fitzhardinge 6162688fcb7SAndrew J. Bennieston RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); 6170d160211SJeremy Fitzhardinge if (notify) 6182688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 6190d160211SJeremy Fitzhardinge 620900e1833SDavid Vrabel u64_stats_update_begin(&tx_stats->syncp); 621900e1833SDavid Vrabel tx_stats->bytes += skb->len; 622900e1833SDavid Vrabel tx_stats->packets++; 623900e1833SDavid Vrabel u64_stats_update_end(&tx_stats->syncp); 62410a273a6SJeremy Fitzhardinge 62510a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 6262688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 6270d160211SJeremy Fitzhardinge 6282688fcb7SAndrew J. Bennieston if (!netfront_tx_slot_available(queue)) 6292688fcb7SAndrew J. Bennieston netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); 6300d160211SJeremy Fitzhardinge 6312688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 6320d160211SJeremy Fitzhardinge 6336ed10654SPatrick McHardy return NETDEV_TX_OK; 6340d160211SJeremy Fitzhardinge 6350d160211SJeremy Fitzhardinge drop: 63609f75cd7SJeff Garzik dev->stats.tx_dropped++; 637979de8a0SEric W. Biederman dev_kfree_skb_any(skb); 6386ed10654SPatrick McHardy return NETDEV_TX_OK; 6390d160211SJeremy Fitzhardinge } 6400d160211SJeremy Fitzhardinge 6410d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 6420d160211SJeremy Fitzhardinge { 6430d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 6442688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 6452688fcb7SAndrew J. Bennieston unsigned int i; 6462688fcb7SAndrew J. Bennieston struct netfront_queue *queue; 6472688fcb7SAndrew J. Bennieston netif_tx_stop_all_queues(np->netdev); 6482688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 6492688fcb7SAndrew J. Bennieston queue = &np->queues[i]; 6502688fcb7SAndrew J. Bennieston napi_disable(&queue->napi); 6512688fcb7SAndrew J. Bennieston } 6520d160211SJeremy Fitzhardinge return 0; 6530d160211SJeremy Fitzhardinge } 6540d160211SJeremy Fitzhardinge 6552688fcb7SAndrew J. Bennieston static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, 6560d160211SJeremy Fitzhardinge grant_ref_t ref) 6570d160211SJeremy Fitzhardinge { 6582688fcb7SAndrew J. Bennieston int new = xennet_rxidx(queue->rx.req_prod_pvt); 6590d160211SJeremy Fitzhardinge 6602688fcb7SAndrew J. Bennieston BUG_ON(queue->rx_skbs[new]); 6612688fcb7SAndrew J. Bennieston queue->rx_skbs[new] = skb; 6622688fcb7SAndrew J. Bennieston queue->grant_rx_ref[new] = ref; 6632688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; 6642688fcb7SAndrew J. Bennieston RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; 6652688fcb7SAndrew J. Bennieston queue->rx.req_prod_pvt++; 6660d160211SJeremy Fitzhardinge } 6670d160211SJeremy Fitzhardinge 6682688fcb7SAndrew J. Bennieston static int xennet_get_extras(struct netfront_queue *queue, 6690d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 6700d160211SJeremy Fitzhardinge RING_IDX rp) 6710d160211SJeremy Fitzhardinge 6720d160211SJeremy Fitzhardinge { 6730d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 6742688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 6752688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 6760d160211SJeremy Fitzhardinge int err = 0; 6770d160211SJeremy Fitzhardinge 6780d160211SJeremy Fitzhardinge do { 6790d160211SJeremy Fitzhardinge struct sk_buff *skb; 6800d160211SJeremy Fitzhardinge grant_ref_t ref; 6810d160211SJeremy Fitzhardinge 6820d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 6830d160211SJeremy Fitzhardinge if (net_ratelimit()) 6840d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 6850d160211SJeremy Fitzhardinge err = -EBADR; 6860d160211SJeremy Fitzhardinge break; 6870d160211SJeremy Fitzhardinge } 6880d160211SJeremy Fitzhardinge 6890d160211SJeremy Fitzhardinge extra = (struct xen_netif_extra_info *) 6902688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 6910d160211SJeremy Fitzhardinge 6920d160211SJeremy Fitzhardinge if (unlikely(!extra->type || 6930d160211SJeremy Fitzhardinge extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 6940d160211SJeremy Fitzhardinge if (net_ratelimit()) 6950d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 6960d160211SJeremy Fitzhardinge extra->type); 6970d160211SJeremy Fitzhardinge err = -EINVAL; 6980d160211SJeremy Fitzhardinge } else { 6990d160211SJeremy Fitzhardinge memcpy(&extras[extra->type - 1], extra, 7000d160211SJeremy Fitzhardinge sizeof(*extra)); 7010d160211SJeremy Fitzhardinge } 7020d160211SJeremy Fitzhardinge 7032688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons); 7042688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons); 7052688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 7060d160211SJeremy Fitzhardinge } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 7070d160211SJeremy Fitzhardinge 7082688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons; 7090d160211SJeremy Fitzhardinge return err; 7100d160211SJeremy Fitzhardinge } 7110d160211SJeremy Fitzhardinge 7122688fcb7SAndrew J. Bennieston static int xennet_get_responses(struct netfront_queue *queue, 7130d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 7140d160211SJeremy Fitzhardinge struct sk_buff_head *list) 7150d160211SJeremy Fitzhardinge { 7160d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo->rx; 7170d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo->extras; 7182688fcb7SAndrew J. Bennieston struct device *dev = &queue->info->netdev->dev; 7192688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 7202688fcb7SAndrew J. Bennieston struct sk_buff *skb = xennet_get_rx_skb(queue, cons); 7212688fcb7SAndrew J. Bennieston grant_ref_t ref = xennet_get_rx_ref(queue, cons); 7220d160211SJeremy Fitzhardinge int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); 7237158ff6dSWei Liu int slots = 1; 7240d160211SJeremy Fitzhardinge int err = 0; 7250d160211SJeremy Fitzhardinge unsigned long ret; 7260d160211SJeremy Fitzhardinge 727f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_extra_info) { 7282688fcb7SAndrew J. Bennieston err = xennet_get_extras(queue, extras, rp); 7292688fcb7SAndrew J. Bennieston cons = queue->rx.rsp_cons; 7300d160211SJeremy Fitzhardinge } 7310d160211SJeremy Fitzhardinge 7320d160211SJeremy Fitzhardinge for (;;) { 7330d160211SJeremy Fitzhardinge if (unlikely(rx->status < 0 || 7340d160211SJeremy Fitzhardinge rx->offset + rx->status > PAGE_SIZE)) { 7350d160211SJeremy Fitzhardinge if (net_ratelimit()) 7360d160211SJeremy Fitzhardinge dev_warn(dev, "rx->offset: %x, size: %u\n", 7370d160211SJeremy Fitzhardinge rx->offset, rx->status); 7382688fcb7SAndrew J. Bennieston xennet_move_rx_slot(queue, skb, ref); 7390d160211SJeremy Fitzhardinge err = -EINVAL; 7400d160211SJeremy Fitzhardinge goto next; 7410d160211SJeremy Fitzhardinge } 7420d160211SJeremy Fitzhardinge 7430d160211SJeremy Fitzhardinge /* 7440d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 7450d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 746697089dcSWei Liu * situation to the system controller to reboot the backend. 7470d160211SJeremy Fitzhardinge */ 7480d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 7490d160211SJeremy Fitzhardinge if (net_ratelimit()) 7500d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 7510d160211SJeremy Fitzhardinge rx->id); 7520d160211SJeremy Fitzhardinge err = -EINVAL; 7530d160211SJeremy Fitzhardinge goto next; 7540d160211SJeremy Fitzhardinge } 7550d160211SJeremy Fitzhardinge 7560d160211SJeremy Fitzhardinge ret = gnttab_end_foreign_access_ref(ref, 0); 7570d160211SJeremy Fitzhardinge BUG_ON(!ret); 7580d160211SJeremy Fitzhardinge 7592688fcb7SAndrew J. Bennieston gnttab_release_grant_reference(&queue->gref_rx_head, ref); 7600d160211SJeremy Fitzhardinge 7610d160211SJeremy Fitzhardinge __skb_queue_tail(list, skb); 7620d160211SJeremy Fitzhardinge 7630d160211SJeremy Fitzhardinge next: 764f942dc25SIan Campbell if (!(rx->flags & XEN_NETRXF_more_data)) 7650d160211SJeremy Fitzhardinge break; 7660d160211SJeremy Fitzhardinge 7677158ff6dSWei Liu if (cons + slots == rp) { 7680d160211SJeremy Fitzhardinge if (net_ratelimit()) 7697158ff6dSWei Liu dev_warn(dev, "Need more slots\n"); 7700d160211SJeremy Fitzhardinge err = -ENOENT; 7710d160211SJeremy Fitzhardinge break; 7720d160211SJeremy Fitzhardinge } 7730d160211SJeremy Fitzhardinge 7742688fcb7SAndrew J. Bennieston rx = RING_GET_RESPONSE(&queue->rx, cons + slots); 7752688fcb7SAndrew J. Bennieston skb = xennet_get_rx_skb(queue, cons + slots); 7762688fcb7SAndrew J. Bennieston ref = xennet_get_rx_ref(queue, cons + slots); 7777158ff6dSWei Liu slots++; 7780d160211SJeremy Fitzhardinge } 7790d160211SJeremy Fitzhardinge 7807158ff6dSWei Liu if (unlikely(slots > max)) { 7810d160211SJeremy Fitzhardinge if (net_ratelimit()) 782697089dcSWei Liu dev_warn(dev, "Too many slots\n"); 7830d160211SJeremy Fitzhardinge err = -E2BIG; 7840d160211SJeremy Fitzhardinge } 7850d160211SJeremy Fitzhardinge 7860d160211SJeremy Fitzhardinge if (unlikely(err)) 7872688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = cons + slots; 7880d160211SJeremy Fitzhardinge 7890d160211SJeremy Fitzhardinge return err; 7900d160211SJeremy Fitzhardinge } 7910d160211SJeremy Fitzhardinge 7920d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 7930d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 7940d160211SJeremy Fitzhardinge { 7950d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 7960d160211SJeremy Fitzhardinge if (net_ratelimit()) 797383eda32SJoe Perches pr_warn("GSO size must not be zero\n"); 7980d160211SJeremy Fitzhardinge return -EINVAL; 7990d160211SJeremy Fitzhardinge } 8000d160211SJeremy Fitzhardinge 8012c0057deSPaul Durrant if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && 8022c0057deSPaul Durrant gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { 8030d160211SJeremy Fitzhardinge if (net_ratelimit()) 804383eda32SJoe Perches pr_warn("Bad GSO type %d\n", gso->u.gso.type); 8050d160211SJeremy Fitzhardinge return -EINVAL; 8060d160211SJeremy Fitzhardinge } 8070d160211SJeremy Fitzhardinge 8080d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 8092c0057deSPaul Durrant skb_shinfo(skb)->gso_type = 8102c0057deSPaul Durrant (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? 8112c0057deSPaul Durrant SKB_GSO_TCPV4 : 8122c0057deSPaul Durrant SKB_GSO_TCPV6; 8130d160211SJeremy Fitzhardinge 8140d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 8150d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 8160d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 8170d160211SJeremy Fitzhardinge 8180d160211SJeremy Fitzhardinge return 0; 8190d160211SJeremy Fitzhardinge } 8200d160211SJeremy Fitzhardinge 8212688fcb7SAndrew J. Bennieston static RING_IDX xennet_fill_frags(struct netfront_queue *queue, 8220d160211SJeremy Fitzhardinge struct sk_buff *skb, 8230d160211SJeremy Fitzhardinge struct sk_buff_head *list) 8240d160211SJeremy Fitzhardinge { 8250d160211SJeremy Fitzhardinge struct skb_shared_info *shinfo = skb_shinfo(skb); 8262688fcb7SAndrew J. Bennieston RING_IDX cons = queue->rx.rsp_cons; 8270d160211SJeremy Fitzhardinge struct sk_buff *nskb; 8280d160211SJeremy Fitzhardinge 8290d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 8300d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = 8312688fcb7SAndrew J. Bennieston RING_GET_RESPONSE(&queue->rx, ++cons); 83201c68026SIan Campbell skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; 8330d160211SJeremy Fitzhardinge 834093b9c71SJan Beulich if (shinfo->nr_frags == MAX_SKB_FRAGS) { 835093b9c71SJan Beulich unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 8360d160211SJeremy Fitzhardinge 837093b9c71SJan Beulich BUG_ON(pull_to <= skb_headlen(skb)); 838093b9c71SJan Beulich __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 839093b9c71SJan Beulich } 840093b9c71SJan Beulich BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); 841093b9c71SJan Beulich 842093b9c71SJan Beulich skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), 843093b9c71SJan Beulich rx->offset, rx->status, PAGE_SIZE); 8440d160211SJeremy Fitzhardinge 8450d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 8460d160211SJeremy Fitzhardinge kfree_skb(nskb); 8470d160211SJeremy Fitzhardinge } 8480d160211SJeremy Fitzhardinge 8490d160211SJeremy Fitzhardinge return cons; 8500d160211SJeremy Fitzhardinge } 8510d160211SJeremy Fitzhardinge 852e0ce4af9SIan Campbell static int checksum_setup(struct net_device *dev, struct sk_buff *skb) 8530d160211SJeremy Fitzhardinge { 854b5cf66cdSPaul Durrant bool recalculate_partial_csum = false; 855e0ce4af9SIan Campbell 856e0ce4af9SIan Campbell /* 857e0ce4af9SIan Campbell * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy 858e0ce4af9SIan Campbell * peers can fail to set NETRXF_csum_blank when sending a GSO 859e0ce4af9SIan Campbell * frame. In this case force the SKB to CHECKSUM_PARTIAL and 860e0ce4af9SIan Campbell * recalculate the partial checksum. 861e0ce4af9SIan Campbell */ 862e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { 863e0ce4af9SIan Campbell struct netfront_info *np = netdev_priv(dev); 8642688fcb7SAndrew J. Bennieston atomic_inc(&np->rx_gso_checksum_fixup); 865e0ce4af9SIan Campbell skb->ip_summed = CHECKSUM_PARTIAL; 866b5cf66cdSPaul Durrant recalculate_partial_csum = true; 867e0ce4af9SIan Campbell } 868e0ce4af9SIan Campbell 869e0ce4af9SIan Campbell /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ 870e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL) 871e0ce4af9SIan Campbell return 0; 8720d160211SJeremy Fitzhardinge 873b5cf66cdSPaul Durrant return skb_checksum_setup(skb, recalculate_partial_csum); 8740d160211SJeremy Fitzhardinge } 8750d160211SJeremy Fitzhardinge 8762688fcb7SAndrew J. Bennieston static int handle_incoming_queue(struct netfront_queue *queue, 8770d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 8780d160211SJeremy Fitzhardinge { 879900e1833SDavid Vrabel struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); 8800d160211SJeremy Fitzhardinge int packets_dropped = 0; 8810d160211SJeremy Fitzhardinge struct sk_buff *skb; 8820d160211SJeremy Fitzhardinge 8830d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 8843683243bSIan Campbell int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 8850d160211SJeremy Fitzhardinge 886093b9c71SJan Beulich if (pull_to > skb_headlen(skb)) 8873683243bSIan Campbell __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 8880d160211SJeremy Fitzhardinge 8890d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 8902688fcb7SAndrew J. Bennieston skb->protocol = eth_type_trans(skb, queue->info->netdev); 891d554f73dSWei Liu skb_reset_network_header(skb); 8920d160211SJeremy Fitzhardinge 8932688fcb7SAndrew J. Bennieston if (checksum_setup(queue->info->netdev, skb)) { 8940d160211SJeremy Fitzhardinge kfree_skb(skb); 8950d160211SJeremy Fitzhardinge packets_dropped++; 8962688fcb7SAndrew J. Bennieston queue->info->netdev->stats.rx_errors++; 8970d160211SJeremy Fitzhardinge continue; 8980d160211SJeremy Fitzhardinge } 8990d160211SJeremy Fitzhardinge 900900e1833SDavid Vrabel u64_stats_update_begin(&rx_stats->syncp); 901900e1833SDavid Vrabel rx_stats->packets++; 902900e1833SDavid Vrabel rx_stats->bytes += skb->len; 903900e1833SDavid Vrabel u64_stats_update_end(&rx_stats->syncp); 9040d160211SJeremy Fitzhardinge 9050d160211SJeremy Fitzhardinge /* Pass it up. */ 9062688fcb7SAndrew J. Bennieston napi_gro_receive(&queue->napi, skb); 9070d160211SJeremy Fitzhardinge } 9080d160211SJeremy Fitzhardinge 9090d160211SJeremy Fitzhardinge return packets_dropped; 9100d160211SJeremy Fitzhardinge } 9110d160211SJeremy Fitzhardinge 912bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 9130d160211SJeremy Fitzhardinge { 9142688fcb7SAndrew J. Bennieston struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); 9152688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 9160d160211SJeremy Fitzhardinge struct sk_buff *skb; 9170d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 9180d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 9190d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 9200d160211SJeremy Fitzhardinge RING_IDX i, rp; 921bea3348eSStephen Hemminger int work_done; 9220d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 9230d160211SJeremy Fitzhardinge struct sk_buff_head errq; 9240d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 9250d160211SJeremy Fitzhardinge int err; 9260d160211SJeremy Fitzhardinge 9272688fcb7SAndrew J. Bennieston spin_lock(&queue->rx_lock); 9280d160211SJeremy Fitzhardinge 9290d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 9300d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 9310d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 9320d160211SJeremy Fitzhardinge 9332688fcb7SAndrew J. Bennieston rp = queue->rx.sring->rsp_prod; 9340d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 9350d160211SJeremy Fitzhardinge 9362688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 9370d160211SJeremy Fitzhardinge work_done = 0; 9380d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 9392688fcb7SAndrew J. Bennieston memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx)); 9400d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 9410d160211SJeremy Fitzhardinge 9422688fcb7SAndrew J. Bennieston err = xennet_get_responses(queue, &rinfo, rp, &tmpq); 9430d160211SJeremy Fitzhardinge 9440d160211SJeremy Fitzhardinge if (unlikely(err)) { 9450d160211SJeremy Fitzhardinge err: 9460d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 9470d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 94809f75cd7SJeff Garzik dev->stats.rx_errors++; 9492688fcb7SAndrew J. Bennieston i = queue->rx.rsp_cons; 9500d160211SJeremy Fitzhardinge continue; 9510d160211SJeremy Fitzhardinge } 9520d160211SJeremy Fitzhardinge 9530d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 9540d160211SJeremy Fitzhardinge 9550d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 9560d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 9570d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 9580d160211SJeremy Fitzhardinge 9590d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 9600d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 9612688fcb7SAndrew J. Bennieston queue->rx.rsp_cons += skb_queue_len(&tmpq); 9620d160211SJeremy Fitzhardinge goto err; 9630d160211SJeremy Fitzhardinge } 9640d160211SJeremy Fitzhardinge } 9650d160211SJeremy Fitzhardinge 9663683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = rx->status; 9673683243bSIan Campbell if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) 9683683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; 9690d160211SJeremy Fitzhardinge 9703683243bSIan Campbell skb_shinfo(skb)->frags[0].page_offset = rx->offset; 9713683243bSIan Campbell skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); 9723683243bSIan Campbell skb->data_len = rx->status; 973093b9c71SJan Beulich skb->len += rx->status; 9740d160211SJeremy Fitzhardinge 9752688fcb7SAndrew J. Bennieston i = xennet_fill_frags(queue, skb, &tmpq); 9760d160211SJeremy Fitzhardinge 977f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_csum_blank) 9780d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 979f942dc25SIan Campbell else if (rx->flags & XEN_NETRXF_data_validated) 9800d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 9810d160211SJeremy Fitzhardinge 9820d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 9830d160211SJeremy Fitzhardinge 9842688fcb7SAndrew J. Bennieston queue->rx.rsp_cons = ++i; 9850d160211SJeremy Fitzhardinge work_done++; 9860d160211SJeremy Fitzhardinge } 9870d160211SJeremy Fitzhardinge 98856cfe5d0SWang Chen __skb_queue_purge(&errq); 9890d160211SJeremy Fitzhardinge 9902688fcb7SAndrew J. Bennieston work_done -= handle_incoming_queue(queue, &rxq); 9910d160211SJeremy Fitzhardinge 9922688fcb7SAndrew J. Bennieston xennet_alloc_rx_buffers(queue); 9930d160211SJeremy Fitzhardinge 9940d160211SJeremy Fitzhardinge if (work_done < budget) { 995bea3348eSStephen Hemminger int more_to_do = 0; 996bea3348eSStephen Hemminger 9976a6dc08fSDavid Vrabel napi_complete(napi); 9980d160211SJeremy Fitzhardinge 9992688fcb7SAndrew J. Bennieston RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); 10006a6dc08fSDavid Vrabel if (more_to_do) 10016a6dc08fSDavid Vrabel napi_schedule(napi); 10020d160211SJeremy Fitzhardinge } 10030d160211SJeremy Fitzhardinge 10042688fcb7SAndrew J. Bennieston spin_unlock(&queue->rx_lock); 10050d160211SJeremy Fitzhardinge 1006bea3348eSStephen Hemminger return work_done; 10070d160211SJeremy Fitzhardinge } 10080d160211SJeremy Fitzhardinge 10090d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 10100d160211SJeremy Fitzhardinge { 10110c36820eSJonathan Davies int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; 10120d160211SJeremy Fitzhardinge 10130d160211SJeremy Fitzhardinge if (mtu > max) 10140d160211SJeremy Fitzhardinge return -EINVAL; 10150d160211SJeremy Fitzhardinge dev->mtu = mtu; 10160d160211SJeremy Fitzhardinge return 0; 10170d160211SJeremy Fitzhardinge } 10180d160211SJeremy Fitzhardinge 1019e00f85beSstephen hemminger static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, 1020e00f85beSstephen hemminger struct rtnl_link_stats64 *tot) 1021e00f85beSstephen hemminger { 1022e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 1023e00f85beSstephen hemminger int cpu; 1024e00f85beSstephen hemminger 1025e00f85beSstephen hemminger for_each_possible_cpu(cpu) { 1026900e1833SDavid Vrabel struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); 1027900e1833SDavid Vrabel struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); 1028e00f85beSstephen hemminger u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1029e00f85beSstephen hemminger unsigned int start; 1030e00f85beSstephen hemminger 1031e00f85beSstephen hemminger do { 1032900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&tx_stats->syncp); 1033900e1833SDavid Vrabel tx_packets = tx_stats->packets; 1034900e1833SDavid Vrabel tx_bytes = tx_stats->bytes; 1035900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); 1036e00f85beSstephen hemminger 1037900e1833SDavid Vrabel do { 1038900e1833SDavid Vrabel start = u64_stats_fetch_begin_irq(&rx_stats->syncp); 1039900e1833SDavid Vrabel rx_packets = rx_stats->packets; 1040900e1833SDavid Vrabel rx_bytes = rx_stats->bytes; 1041900e1833SDavid Vrabel } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); 1042e00f85beSstephen hemminger 1043e00f85beSstephen hemminger tot->rx_packets += rx_packets; 1044e00f85beSstephen hemminger tot->tx_packets += tx_packets; 1045e00f85beSstephen hemminger tot->rx_bytes += rx_bytes; 1046e00f85beSstephen hemminger tot->tx_bytes += tx_bytes; 1047e00f85beSstephen hemminger } 1048e00f85beSstephen hemminger 1049e00f85beSstephen hemminger tot->rx_errors = dev->stats.rx_errors; 1050e00f85beSstephen hemminger tot->tx_dropped = dev->stats.tx_dropped; 1051e00f85beSstephen hemminger 1052e00f85beSstephen hemminger return tot; 1053e00f85beSstephen hemminger } 1054e00f85beSstephen hemminger 10552688fcb7SAndrew J. Bennieston static void xennet_release_tx_bufs(struct netfront_queue *queue) 10560d160211SJeremy Fitzhardinge { 10570d160211SJeremy Fitzhardinge struct sk_buff *skb; 10580d160211SJeremy Fitzhardinge int i; 10590d160211SJeremy Fitzhardinge 10600d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 10610d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 10622688fcb7SAndrew J. Bennieston if (skb_entry_is_link(&queue->tx_skbs[i])) 10630d160211SJeremy Fitzhardinge continue; 10640d160211SJeremy Fitzhardinge 10652688fcb7SAndrew J. Bennieston skb = queue->tx_skbs[i].skb; 10662688fcb7SAndrew J. Bennieston get_page(queue->grant_tx_page[i]); 10672688fcb7SAndrew J. Bennieston gnttab_end_foreign_access(queue->grant_tx_ref[i], 1068cefe0078SAnnie Li GNTMAP_readonly, 10692688fcb7SAndrew J. Bennieston (unsigned long)page_address(queue->grant_tx_page[i])); 10702688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 10712688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 10722688fcb7SAndrew J. Bennieston add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i); 10730d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 10740d160211SJeremy Fitzhardinge } 10750d160211SJeremy Fitzhardinge } 10760d160211SJeremy Fitzhardinge 10772688fcb7SAndrew J. Bennieston static void xennet_release_rx_bufs(struct netfront_queue *queue) 10780d160211SJeremy Fitzhardinge { 10790d160211SJeremy Fitzhardinge int id, ref; 10800d160211SJeremy Fitzhardinge 10812688fcb7SAndrew J. Bennieston spin_lock_bh(&queue->rx_lock); 10820d160211SJeremy Fitzhardinge 10830d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 1084cefe0078SAnnie Li struct sk_buff *skb; 1085cefe0078SAnnie Li struct page *page; 10860d160211SJeremy Fitzhardinge 10872688fcb7SAndrew J. Bennieston skb = queue->rx_skbs[id]; 1088cefe0078SAnnie Li if (!skb) 1089cefe0078SAnnie Li continue; 1090cefe0078SAnnie Li 10912688fcb7SAndrew J. Bennieston ref = queue->grant_rx_ref[id]; 1092cefe0078SAnnie Li if (ref == GRANT_INVALID_REF) 1093cefe0078SAnnie Li continue; 1094cefe0078SAnnie Li 1095cefe0078SAnnie Li page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 1096cefe0078SAnnie Li 1097cefe0078SAnnie Li /* gnttab_end_foreign_access() needs a page ref until 1098cefe0078SAnnie Li * foreign access is ended (which may be deferred). 1099cefe0078SAnnie Li */ 1100cefe0078SAnnie Li get_page(page); 1101cefe0078SAnnie Li gnttab_end_foreign_access(ref, 0, 1102cefe0078SAnnie Li (unsigned long)page_address(page)); 11032688fcb7SAndrew J. Bennieston queue->grant_rx_ref[id] = GRANT_INVALID_REF; 11040d160211SJeremy Fitzhardinge 1105cefe0078SAnnie Li kfree_skb(skb); 11060d160211SJeremy Fitzhardinge } 11070d160211SJeremy Fitzhardinge 11082688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 11090d160211SJeremy Fitzhardinge } 11100d160211SJeremy Fitzhardinge 1111c8f44affSMichał Mirosław static netdev_features_t xennet_fix_features(struct net_device *dev, 1112c8f44affSMichał Mirosław netdev_features_t features) 11138f7b01a1SEric Dumazet { 11148f7b01a1SEric Dumazet struct netfront_info *np = netdev_priv(dev); 11158f7b01a1SEric Dumazet int val; 11168f7b01a1SEric Dumazet 11178f7b01a1SEric Dumazet if (features & NETIF_F_SG) { 11188f7b01a1SEric Dumazet if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", 11198f7b01a1SEric Dumazet "%d", &val) < 0) 11208f7b01a1SEric Dumazet val = 0; 11218f7b01a1SEric Dumazet 11228f7b01a1SEric Dumazet if (!val) 11238f7b01a1SEric Dumazet features &= ~NETIF_F_SG; 11248f7b01a1SEric Dumazet } 11258f7b01a1SEric Dumazet 11262c0057deSPaul Durrant if (features & NETIF_F_IPV6_CSUM) { 11272c0057deSPaul Durrant if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 11282c0057deSPaul Durrant "feature-ipv6-csum-offload", "%d", &val) < 0) 11292c0057deSPaul Durrant val = 0; 11302c0057deSPaul Durrant 11312c0057deSPaul Durrant if (!val) 11322c0057deSPaul Durrant features &= ~NETIF_F_IPV6_CSUM; 11332c0057deSPaul Durrant } 11342c0057deSPaul Durrant 11358f7b01a1SEric Dumazet if (features & NETIF_F_TSO) { 11368f7b01a1SEric Dumazet if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 11378f7b01a1SEric Dumazet "feature-gso-tcpv4", "%d", &val) < 0) 11388f7b01a1SEric Dumazet val = 0; 11398f7b01a1SEric Dumazet 11408f7b01a1SEric Dumazet if (!val) 11418f7b01a1SEric Dumazet features &= ~NETIF_F_TSO; 11428f7b01a1SEric Dumazet } 11438f7b01a1SEric Dumazet 11442c0057deSPaul Durrant if (features & NETIF_F_TSO6) { 11452c0057deSPaul Durrant if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 11462c0057deSPaul Durrant "feature-gso-tcpv6", "%d", &val) < 0) 11472c0057deSPaul Durrant val = 0; 11482c0057deSPaul Durrant 11492c0057deSPaul Durrant if (!val) 11502c0057deSPaul Durrant features &= ~NETIF_F_TSO6; 11512c0057deSPaul Durrant } 11522c0057deSPaul Durrant 11538f7b01a1SEric Dumazet return features; 11548f7b01a1SEric Dumazet } 11558f7b01a1SEric Dumazet 1156c8f44affSMichał Mirosław static int xennet_set_features(struct net_device *dev, 1157c8f44affSMichał Mirosław netdev_features_t features) 11588f7b01a1SEric Dumazet { 11598f7b01a1SEric Dumazet if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { 11608f7b01a1SEric Dumazet netdev_info(dev, "Reducing MTU because no SG offload"); 11618f7b01a1SEric Dumazet dev->mtu = ETH_DATA_LEN; 11628f7b01a1SEric Dumazet } 11638f7b01a1SEric Dumazet 11648f7b01a1SEric Dumazet return 0; 11658f7b01a1SEric Dumazet } 11668f7b01a1SEric Dumazet 1167d634bf2cSWei Liu static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) 1168cf66f9d4SKonrad Rzeszutek Wilk { 11692688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 1170cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 1171cf66f9d4SKonrad Rzeszutek Wilk 11722688fcb7SAndrew J. Bennieston spin_lock_irqsave(&queue->tx_lock, flags); 11732688fcb7SAndrew J. Bennieston xennet_tx_buf_gc(queue); 11742688fcb7SAndrew J. Bennieston spin_unlock_irqrestore(&queue->tx_lock, flags); 1175cf66f9d4SKonrad Rzeszutek Wilk 1176cf66f9d4SKonrad Rzeszutek Wilk return IRQ_HANDLED; 1177cf66f9d4SKonrad Rzeszutek Wilk } 1178cf66f9d4SKonrad Rzeszutek Wilk 1179d634bf2cSWei Liu static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) 1180d634bf2cSWei Liu { 11812688fcb7SAndrew J. Bennieston struct netfront_queue *queue = dev_id; 11822688fcb7SAndrew J. Bennieston struct net_device *dev = queue->info->netdev; 1183d634bf2cSWei Liu 1184d634bf2cSWei Liu if (likely(netif_carrier_ok(dev) && 11852688fcb7SAndrew J. Bennieston RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) 11862688fcb7SAndrew J. Bennieston napi_schedule(&queue->napi); 1187d634bf2cSWei Liu 1188d634bf2cSWei Liu return IRQ_HANDLED; 1189d634bf2cSWei Liu } 1190d634bf2cSWei Liu 1191d634bf2cSWei Liu static irqreturn_t xennet_interrupt(int irq, void *dev_id) 1192d634bf2cSWei Liu { 1193d634bf2cSWei Liu xennet_tx_interrupt(irq, dev_id); 1194d634bf2cSWei Liu xennet_rx_interrupt(irq, dev_id); 1195d634bf2cSWei Liu return IRQ_HANDLED; 1196d634bf2cSWei Liu } 1197d634bf2cSWei Liu 1198cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1199cf66f9d4SKonrad Rzeszutek Wilk static void xennet_poll_controller(struct net_device *dev) 1200cf66f9d4SKonrad Rzeszutek Wilk { 12012688fcb7SAndrew J. Bennieston /* Poll each queue */ 12022688fcb7SAndrew J. Bennieston struct netfront_info *info = netdev_priv(dev); 12032688fcb7SAndrew J. Bennieston unsigned int num_queues = dev->real_num_tx_queues; 12042688fcb7SAndrew J. Bennieston unsigned int i; 12052688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) 12062688fcb7SAndrew J. Bennieston xennet_interrupt(0, &info->queues[i]); 1207cf66f9d4SKonrad Rzeszutek Wilk } 1208cf66f9d4SKonrad Rzeszutek Wilk #endif 1209cf66f9d4SKonrad Rzeszutek Wilk 12100a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 12110a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 12120a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 12130a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 12140a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 1215e00f85beSstephen hemminger .ndo_get_stats64 = xennet_get_stats64, 12160a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 12170a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 1218fb507934SMichał Mirosław .ndo_fix_features = xennet_fix_features, 1219fb507934SMichał Mirosław .ndo_set_features = xennet_set_features, 12202688fcb7SAndrew J. Bennieston .ndo_select_queue = xennet_select_queue, 1221cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1222cf66f9d4SKonrad Rzeszutek Wilk .ndo_poll_controller = xennet_poll_controller, 1223cf66f9d4SKonrad Rzeszutek Wilk #endif 12240a0b9d2eSStephen Hemminger }; 12250a0b9d2eSStephen Hemminger 1226900e1833SDavid Vrabel static void xennet_free_netdev(struct net_device *netdev) 1227900e1833SDavid Vrabel { 1228900e1833SDavid Vrabel struct netfront_info *np = netdev_priv(netdev); 1229900e1833SDavid Vrabel 1230900e1833SDavid Vrabel free_percpu(np->rx_stats); 1231900e1833SDavid Vrabel free_percpu(np->tx_stats); 1232900e1833SDavid Vrabel free_netdev(netdev); 1233900e1833SDavid Vrabel } 1234900e1833SDavid Vrabel 12358e0e46bbSBill Pemberton static struct net_device *xennet_create_dev(struct xenbus_device *dev) 12360d160211SJeremy Fitzhardinge { 12372688fcb7SAndrew J. Bennieston int err; 12380d160211SJeremy Fitzhardinge struct net_device *netdev; 12390d160211SJeremy Fitzhardinge struct netfront_info *np; 12400d160211SJeremy Fitzhardinge 124150ee6061SAndrew J. Bennieston netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); 124241de8d4cSJoe Perches if (!netdev) 12430d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 12440d160211SJeremy Fitzhardinge 12450d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 12460d160211SJeremy Fitzhardinge np->xbdev = dev; 12470d160211SJeremy Fitzhardinge 12482688fcb7SAndrew J. Bennieston /* No need to use rtnl_lock() before the call below as it 12492688fcb7SAndrew J. Bennieston * happens before register_netdev(). 12502688fcb7SAndrew J. Bennieston */ 12512688fcb7SAndrew J. Bennieston netif_set_real_num_tx_queues(netdev, 0); 12522688fcb7SAndrew J. Bennieston np->queues = NULL; 12530d160211SJeremy Fitzhardinge 1254e00f85beSstephen hemminger err = -ENOMEM; 1255900e1833SDavid Vrabel np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1256900e1833SDavid Vrabel if (np->rx_stats == NULL) 1257900e1833SDavid Vrabel goto exit; 1258900e1833SDavid Vrabel np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1259900e1833SDavid Vrabel if (np->tx_stats == NULL) 1260e00f85beSstephen hemminger goto exit; 1261e00f85beSstephen hemminger 12620a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 12630a0b9d2eSStephen Hemminger 1264fb507934SMichał Mirosław netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | 1265fb507934SMichał Mirosław NETIF_F_GSO_ROBUST; 12662c0057deSPaul Durrant netdev->hw_features = NETIF_F_SG | 12672c0057deSPaul Durrant NETIF_F_IPV6_CSUM | 12682c0057deSPaul Durrant NETIF_F_TSO | NETIF_F_TSO6; 12690d160211SJeremy Fitzhardinge 1270fc3e5941SIan Campbell /* 1271fc3e5941SIan Campbell * Assume that all hw features are available for now. This set 1272fc3e5941SIan Campbell * will be adjusted by the call to netdev_update_features() in 1273fc3e5941SIan Campbell * xennet_connect() which is the earliest point where we can 1274fc3e5941SIan Campbell * negotiate with the backend regarding supported features. 1275fc3e5941SIan Campbell */ 1276fc3e5941SIan Campbell netdev->features |= netdev->hw_features; 1277fc3e5941SIan Campbell 12787ad24ea4SWilfried Klaebe netdev->ethtool_ops = &xennet_ethtool_ops; 12790d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 12800d160211SJeremy Fitzhardinge 12810d160211SJeremy Fitzhardinge np->netdev = netdev; 12820d160211SJeremy Fitzhardinge 12830d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 12840d160211SJeremy Fitzhardinge 12850d160211SJeremy Fitzhardinge return netdev; 12860d160211SJeremy Fitzhardinge 12870d160211SJeremy Fitzhardinge exit: 1288900e1833SDavid Vrabel xennet_free_netdev(netdev); 12890d160211SJeremy Fitzhardinge return ERR_PTR(err); 12900d160211SJeremy Fitzhardinge } 12910d160211SJeremy Fitzhardinge 12920d160211SJeremy Fitzhardinge /** 12930d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 12940d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 12950d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 12960d160211SJeremy Fitzhardinge */ 12978e0e46bbSBill Pemberton static int netfront_probe(struct xenbus_device *dev, 12980d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 12990d160211SJeremy Fitzhardinge { 13000d160211SJeremy Fitzhardinge int err; 13010d160211SJeremy Fitzhardinge struct net_device *netdev; 13020d160211SJeremy Fitzhardinge struct netfront_info *info; 13030d160211SJeremy Fitzhardinge 13040d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 13050d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 13060d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 13070d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 13080d160211SJeremy Fitzhardinge return err; 13090d160211SJeremy Fitzhardinge } 13100d160211SJeremy Fitzhardinge 13110d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 13121b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 131327b917e5STakashi Iwai #ifdef CONFIG_SYSFS 131427b917e5STakashi Iwai info->netdev->sysfs_groups[0] = &xennet_dev_group; 131527b917e5STakashi Iwai #endif 13160d160211SJeremy Fitzhardinge err = register_netdev(info->netdev); 13170d160211SJeremy Fitzhardinge if (err) { 1318383eda32SJoe Perches pr_warn("%s: register_netdev err=%d\n", __func__, err); 13190d160211SJeremy Fitzhardinge goto fail; 13200d160211SJeremy Fitzhardinge } 13210d160211SJeremy Fitzhardinge 13220d160211SJeremy Fitzhardinge return 0; 13230d160211SJeremy Fitzhardinge 13240d160211SJeremy Fitzhardinge fail: 1325900e1833SDavid Vrabel xennet_free_netdev(netdev); 13261b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, NULL); 13270d160211SJeremy Fitzhardinge return err; 13280d160211SJeremy Fitzhardinge } 13290d160211SJeremy Fitzhardinge 13300d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 13310d160211SJeremy Fitzhardinge { 13320d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 13330d160211SJeremy Fitzhardinge if (ref != GRANT_INVALID_REF) 13340d160211SJeremy Fitzhardinge gnttab_end_foreign_access(ref, 0, (unsigned long)page); 13350d160211SJeremy Fitzhardinge } 13360d160211SJeremy Fitzhardinge 13370d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 13380d160211SJeremy Fitzhardinge { 13392688fcb7SAndrew J. Bennieston unsigned int i = 0; 13402688fcb7SAndrew J. Bennieston unsigned int num_queues = info->netdev->real_num_tx_queues; 13410d160211SJeremy Fitzhardinge 1342f9feb1e6SDavid Vrabel netif_carrier_off(info->netdev); 1343f9feb1e6SDavid Vrabel 13442688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 134576541869SDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 134676541869SDavid Vrabel 13472688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) 13482688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 13492688fcb7SAndrew J. Bennieston if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { 13502688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 13512688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->rx_irq, queue); 1352d634bf2cSWei Liu } 13532688fcb7SAndrew J. Bennieston queue->tx_evtchn = queue->rx_evtchn = 0; 13542688fcb7SAndrew J. Bennieston queue->tx_irq = queue->rx_irq = 0; 13550d160211SJeremy Fitzhardinge 1356f9feb1e6SDavid Vrabel napi_synchronize(&queue->napi); 1357f9feb1e6SDavid Vrabel 1358a5b5dc3cSDavid Vrabel xennet_release_tx_bufs(queue); 1359a5b5dc3cSDavid Vrabel xennet_release_rx_bufs(queue); 1360a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_tx_head); 1361a5b5dc3cSDavid Vrabel gnttab_free_grant_references(queue->gref_rx_head); 1362a5b5dc3cSDavid Vrabel 13630d160211SJeremy Fitzhardinge /* End access and free the pages */ 13642688fcb7SAndrew J. Bennieston xennet_end_access(queue->tx_ring_ref, queue->tx.sring); 13652688fcb7SAndrew J. Bennieston xennet_end_access(queue->rx_ring_ref, queue->rx.sring); 13660d160211SJeremy Fitzhardinge 13672688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 13682688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 13692688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 13702688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 13712688fcb7SAndrew J. Bennieston } 13720d160211SJeremy Fitzhardinge } 13730d160211SJeremy Fitzhardinge 13740d160211SJeremy Fitzhardinge /** 13750d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 13760d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 13770d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 13780d160211SJeremy Fitzhardinge * rest of the kernel. 13790d160211SJeremy Fitzhardinge */ 13800d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 13810d160211SJeremy Fitzhardinge { 13821b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 13830d160211SJeremy Fitzhardinge 13840d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 13850d160211SJeremy Fitzhardinge 13860d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 13870d160211SJeremy Fitzhardinge return 0; 13880d160211SJeremy Fitzhardinge } 13890d160211SJeremy Fitzhardinge 13900d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 13910d160211SJeremy Fitzhardinge { 13920d160211SJeremy Fitzhardinge char *s, *e, *macstr; 13930d160211SJeremy Fitzhardinge int i; 13940d160211SJeremy Fitzhardinge 13950d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 13960d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 13970d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 13980d160211SJeremy Fitzhardinge 13990d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 14000d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 14010d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 14020d160211SJeremy Fitzhardinge kfree(macstr); 14030d160211SJeremy Fitzhardinge return -ENOENT; 14040d160211SJeremy Fitzhardinge } 14050d160211SJeremy Fitzhardinge s = e+1; 14060d160211SJeremy Fitzhardinge } 14070d160211SJeremy Fitzhardinge 14080d160211SJeremy Fitzhardinge kfree(macstr); 14090d160211SJeremy Fitzhardinge return 0; 14100d160211SJeremy Fitzhardinge } 14110d160211SJeremy Fitzhardinge 14122688fcb7SAndrew J. Bennieston static int setup_netfront_single(struct netfront_queue *queue) 1413d634bf2cSWei Liu { 1414d634bf2cSWei Liu int err; 1415d634bf2cSWei Liu 14162688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1417d634bf2cSWei Liu if (err < 0) 1418d634bf2cSWei Liu goto fail; 1419d634bf2cSWei Liu 14202688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1421d634bf2cSWei Liu xennet_interrupt, 14222688fcb7SAndrew J. Bennieston 0, queue->info->netdev->name, queue); 1423d634bf2cSWei Liu if (err < 0) 1424d634bf2cSWei Liu goto bind_fail; 14252688fcb7SAndrew J. Bennieston queue->rx_evtchn = queue->tx_evtchn; 14262688fcb7SAndrew J. Bennieston queue->rx_irq = queue->tx_irq = err; 1427d634bf2cSWei Liu 1428d634bf2cSWei Liu return 0; 1429d634bf2cSWei Liu 1430d634bf2cSWei Liu bind_fail: 14312688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 14322688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1433d634bf2cSWei Liu fail: 1434d634bf2cSWei Liu return err; 1435d634bf2cSWei Liu } 1436d634bf2cSWei Liu 14372688fcb7SAndrew J. Bennieston static int setup_netfront_split(struct netfront_queue *queue) 1438d634bf2cSWei Liu { 1439d634bf2cSWei Liu int err; 1440d634bf2cSWei Liu 14412688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); 1442d634bf2cSWei Liu if (err < 0) 1443d634bf2cSWei Liu goto fail; 14442688fcb7SAndrew J. Bennieston err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); 1445d634bf2cSWei Liu if (err < 0) 1446d634bf2cSWei Liu goto alloc_rx_evtchn_fail; 1447d634bf2cSWei Liu 14482688fcb7SAndrew J. Bennieston snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 14492688fcb7SAndrew J. Bennieston "%s-tx", queue->name); 14502688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->tx_evtchn, 1451d634bf2cSWei Liu xennet_tx_interrupt, 14522688fcb7SAndrew J. Bennieston 0, queue->tx_irq_name, queue); 1453d634bf2cSWei Liu if (err < 0) 1454d634bf2cSWei Liu goto bind_tx_fail; 14552688fcb7SAndrew J. Bennieston queue->tx_irq = err; 1456d634bf2cSWei Liu 14572688fcb7SAndrew J. Bennieston snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 14582688fcb7SAndrew J. Bennieston "%s-rx", queue->name); 14592688fcb7SAndrew J. Bennieston err = bind_evtchn_to_irqhandler(queue->rx_evtchn, 1460d634bf2cSWei Liu xennet_rx_interrupt, 14612688fcb7SAndrew J. Bennieston 0, queue->rx_irq_name, queue); 1462d634bf2cSWei Liu if (err < 0) 1463d634bf2cSWei Liu goto bind_rx_fail; 14642688fcb7SAndrew J. Bennieston queue->rx_irq = err; 1465d634bf2cSWei Liu 1466d634bf2cSWei Liu return 0; 1467d634bf2cSWei Liu 1468d634bf2cSWei Liu bind_rx_fail: 14692688fcb7SAndrew J. Bennieston unbind_from_irqhandler(queue->tx_irq, queue); 14702688fcb7SAndrew J. Bennieston queue->tx_irq = 0; 1471d634bf2cSWei Liu bind_tx_fail: 14722688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); 14732688fcb7SAndrew J. Bennieston queue->rx_evtchn = 0; 1474d634bf2cSWei Liu alloc_rx_evtchn_fail: 14752688fcb7SAndrew J. Bennieston xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); 14762688fcb7SAndrew J. Bennieston queue->tx_evtchn = 0; 1477d634bf2cSWei Liu fail: 1478d634bf2cSWei Liu return err; 1479d634bf2cSWei Liu } 1480d634bf2cSWei Liu 14812688fcb7SAndrew J. Bennieston static int setup_netfront(struct xenbus_device *dev, 14822688fcb7SAndrew J. Bennieston struct netfront_queue *queue, unsigned int feature_split_evtchn) 14830d160211SJeremy Fitzhardinge { 14840d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 14850d160211SJeremy Fitzhardinge struct xen_netif_rx_sring *rxs; 14860d160211SJeremy Fitzhardinge int err; 14870d160211SJeremy Fitzhardinge 14882688fcb7SAndrew J. Bennieston queue->tx_ring_ref = GRANT_INVALID_REF; 14892688fcb7SAndrew J. Bennieston queue->rx_ring_ref = GRANT_INVALID_REF; 14902688fcb7SAndrew J. Bennieston queue->rx.sring = NULL; 14912688fcb7SAndrew J. Bennieston queue->tx.sring = NULL; 14920d160211SJeremy Fitzhardinge 1493a144ff09SIan Campbell txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 14940d160211SJeremy Fitzhardinge if (!txs) { 14950d160211SJeremy Fitzhardinge err = -ENOMEM; 14960d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating tx ring page"); 14970d160211SJeremy Fitzhardinge goto fail; 14980d160211SJeremy Fitzhardinge } 14990d160211SJeremy Fitzhardinge SHARED_RING_INIT(txs); 15002688fcb7SAndrew J. Bennieston FRONT_RING_INIT(&queue->tx, txs, PAGE_SIZE); 15010d160211SJeremy Fitzhardinge 15020d160211SJeremy Fitzhardinge err = xenbus_grant_ring(dev, virt_to_mfn(txs)); 15031ca2983aSWei Liu if (err < 0) 15041ca2983aSWei Liu goto grant_tx_ring_fail; 15052688fcb7SAndrew J. Bennieston queue->tx_ring_ref = err; 15060d160211SJeremy Fitzhardinge 1507a144ff09SIan Campbell rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 15080d160211SJeremy Fitzhardinge if (!rxs) { 15090d160211SJeremy Fitzhardinge err = -ENOMEM; 15100d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating rx ring page"); 15111ca2983aSWei Liu goto alloc_rx_ring_fail; 15120d160211SJeremy Fitzhardinge } 15130d160211SJeremy Fitzhardinge SHARED_RING_INIT(rxs); 15142688fcb7SAndrew J. Bennieston FRONT_RING_INIT(&queue->rx, rxs, PAGE_SIZE); 15150d160211SJeremy Fitzhardinge 15160d160211SJeremy Fitzhardinge err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); 15171ca2983aSWei Liu if (err < 0) 15181ca2983aSWei Liu goto grant_rx_ring_fail; 15192688fcb7SAndrew J. Bennieston queue->rx_ring_ref = err; 15200d160211SJeremy Fitzhardinge 1521d634bf2cSWei Liu if (feature_split_evtchn) 15222688fcb7SAndrew J. Bennieston err = setup_netfront_split(queue); 1523d634bf2cSWei Liu /* setup single event channel if 1524d634bf2cSWei Liu * a) feature-split-event-channels == 0 1525d634bf2cSWei Liu * b) feature-split-event-channels == 1 but failed to setup 1526d634bf2cSWei Liu */ 1527d634bf2cSWei Liu if (!feature_split_evtchn || (feature_split_evtchn && err)) 15282688fcb7SAndrew J. Bennieston err = setup_netfront_single(queue); 1529d634bf2cSWei Liu 15300d160211SJeremy Fitzhardinge if (err) 15311ca2983aSWei Liu goto alloc_evtchn_fail; 15320d160211SJeremy Fitzhardinge 15330d160211SJeremy Fitzhardinge return 0; 15340d160211SJeremy Fitzhardinge 15351ca2983aSWei Liu /* If we fail to setup netfront, it is safe to just revoke access to 15361ca2983aSWei Liu * granted pages because backend is not accessing it at this point. 15371ca2983aSWei Liu */ 15381ca2983aSWei Liu alloc_evtchn_fail: 15392688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); 15401ca2983aSWei Liu grant_rx_ring_fail: 15411ca2983aSWei Liu free_page((unsigned long)rxs); 15421ca2983aSWei Liu alloc_rx_ring_fail: 15432688fcb7SAndrew J. Bennieston gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); 15441ca2983aSWei Liu grant_tx_ring_fail: 15451ca2983aSWei Liu free_page((unsigned long)txs); 15460d160211SJeremy Fitzhardinge fail: 15470d160211SJeremy Fitzhardinge return err; 15480d160211SJeremy Fitzhardinge } 15490d160211SJeremy Fitzhardinge 15502688fcb7SAndrew J. Bennieston /* Queue-specific initialisation 15512688fcb7SAndrew J. Bennieston * This used to be done in xennet_create_dev() but must now 15522688fcb7SAndrew J. Bennieston * be run per-queue. 15532688fcb7SAndrew J. Bennieston */ 15542688fcb7SAndrew J. Bennieston static int xennet_init_queue(struct netfront_queue *queue) 15552688fcb7SAndrew J. Bennieston { 15562688fcb7SAndrew J. Bennieston unsigned short i; 15572688fcb7SAndrew J. Bennieston int err = 0; 15582688fcb7SAndrew J. Bennieston 15592688fcb7SAndrew J. Bennieston spin_lock_init(&queue->tx_lock); 15602688fcb7SAndrew J. Bennieston spin_lock_init(&queue->rx_lock); 15612688fcb7SAndrew J. Bennieston 15622688fcb7SAndrew J. Bennieston init_timer(&queue->rx_refill_timer); 15632688fcb7SAndrew J. Bennieston queue->rx_refill_timer.data = (unsigned long)queue; 15642688fcb7SAndrew J. Bennieston queue->rx_refill_timer.function = rx_refill_timeout; 15652688fcb7SAndrew J. Bennieston 15668b715010SWei Liu snprintf(queue->name, sizeof(queue->name), "%s-q%u", 15678b715010SWei Liu queue->info->netdev->name, queue->id); 15688b715010SWei Liu 15692688fcb7SAndrew J. Bennieston /* Initialise tx_skbs as a free chain containing every entry. */ 15702688fcb7SAndrew J. Bennieston queue->tx_skb_freelist = 0; 15712688fcb7SAndrew J. Bennieston for (i = 0; i < NET_TX_RING_SIZE; i++) { 15722688fcb7SAndrew J. Bennieston skb_entry_set_link(&queue->tx_skbs[i], i+1); 15732688fcb7SAndrew J. Bennieston queue->grant_tx_ref[i] = GRANT_INVALID_REF; 15742688fcb7SAndrew J. Bennieston queue->grant_tx_page[i] = NULL; 15752688fcb7SAndrew J. Bennieston } 15762688fcb7SAndrew J. Bennieston 15772688fcb7SAndrew J. Bennieston /* Clear out rx_skbs */ 15782688fcb7SAndrew J. Bennieston for (i = 0; i < NET_RX_RING_SIZE; i++) { 15792688fcb7SAndrew J. Bennieston queue->rx_skbs[i] = NULL; 15802688fcb7SAndrew J. Bennieston queue->grant_rx_ref[i] = GRANT_INVALID_REF; 15812688fcb7SAndrew J. Bennieston } 15822688fcb7SAndrew J. Bennieston 15832688fcb7SAndrew J. Bennieston /* A grant for every tx ring slot */ 15841f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, 15852688fcb7SAndrew J. Bennieston &queue->gref_tx_head) < 0) { 15862688fcb7SAndrew J. Bennieston pr_alert("can't alloc tx grant refs\n"); 15872688fcb7SAndrew J. Bennieston err = -ENOMEM; 15882688fcb7SAndrew J. Bennieston goto exit; 15892688fcb7SAndrew J. Bennieston } 15902688fcb7SAndrew J. Bennieston 15912688fcb7SAndrew J. Bennieston /* A grant for every rx ring slot */ 15921f3c2ebaSDavid Vrabel if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, 15932688fcb7SAndrew J. Bennieston &queue->gref_rx_head) < 0) { 15942688fcb7SAndrew J. Bennieston pr_alert("can't alloc rx grant refs\n"); 15952688fcb7SAndrew J. Bennieston err = -ENOMEM; 15962688fcb7SAndrew J. Bennieston goto exit_free_tx; 15972688fcb7SAndrew J. Bennieston } 15982688fcb7SAndrew J. Bennieston 15992688fcb7SAndrew J. Bennieston return 0; 16002688fcb7SAndrew J. Bennieston 16012688fcb7SAndrew J. Bennieston exit_free_tx: 16022688fcb7SAndrew J. Bennieston gnttab_free_grant_references(queue->gref_tx_head); 16032688fcb7SAndrew J. Bennieston exit: 16042688fcb7SAndrew J. Bennieston return err; 16052688fcb7SAndrew J. Bennieston } 16062688fcb7SAndrew J. Bennieston 160750ee6061SAndrew J. Bennieston static int write_queue_xenstore_keys(struct netfront_queue *queue, 160850ee6061SAndrew J. Bennieston struct xenbus_transaction *xbt, int write_hierarchical) 160950ee6061SAndrew J. Bennieston { 161050ee6061SAndrew J. Bennieston /* Write the queue-specific keys into XenStore in the traditional 161150ee6061SAndrew J. Bennieston * way for a single queue, or in a queue subkeys for multiple 161250ee6061SAndrew J. Bennieston * queues. 161350ee6061SAndrew J. Bennieston */ 161450ee6061SAndrew J. Bennieston struct xenbus_device *dev = queue->info->xbdev; 161550ee6061SAndrew J. Bennieston int err; 161650ee6061SAndrew J. Bennieston const char *message; 161750ee6061SAndrew J. Bennieston char *path; 161850ee6061SAndrew J. Bennieston size_t pathsize; 161950ee6061SAndrew J. Bennieston 162050ee6061SAndrew J. Bennieston /* Choose the correct place to write the keys */ 162150ee6061SAndrew J. Bennieston if (write_hierarchical) { 162250ee6061SAndrew J. Bennieston pathsize = strlen(dev->nodename) + 10; 162350ee6061SAndrew J. Bennieston path = kzalloc(pathsize, GFP_KERNEL); 162450ee6061SAndrew J. Bennieston if (!path) { 162550ee6061SAndrew J. Bennieston err = -ENOMEM; 162650ee6061SAndrew J. Bennieston message = "out of memory while writing ring references"; 162750ee6061SAndrew J. Bennieston goto error; 162850ee6061SAndrew J. Bennieston } 162950ee6061SAndrew J. Bennieston snprintf(path, pathsize, "%s/queue-%u", 163050ee6061SAndrew J. Bennieston dev->nodename, queue->id); 163150ee6061SAndrew J. Bennieston } else { 163250ee6061SAndrew J. Bennieston path = (char *)dev->nodename; 163350ee6061SAndrew J. Bennieston } 163450ee6061SAndrew J. Bennieston 163550ee6061SAndrew J. Bennieston /* Write ring references */ 163650ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", 163750ee6061SAndrew J. Bennieston queue->tx_ring_ref); 163850ee6061SAndrew J. Bennieston if (err) { 163950ee6061SAndrew J. Bennieston message = "writing tx-ring-ref"; 164050ee6061SAndrew J. Bennieston goto error; 164150ee6061SAndrew J. Bennieston } 164250ee6061SAndrew J. Bennieston 164350ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", 164450ee6061SAndrew J. Bennieston queue->rx_ring_ref); 164550ee6061SAndrew J. Bennieston if (err) { 164650ee6061SAndrew J. Bennieston message = "writing rx-ring-ref"; 164750ee6061SAndrew J. Bennieston goto error; 164850ee6061SAndrew J. Bennieston } 164950ee6061SAndrew J. Bennieston 165050ee6061SAndrew J. Bennieston /* Write event channels; taking into account both shared 165150ee6061SAndrew J. Bennieston * and split event channel scenarios. 165250ee6061SAndrew J. Bennieston */ 165350ee6061SAndrew J. Bennieston if (queue->tx_evtchn == queue->rx_evtchn) { 165450ee6061SAndrew J. Bennieston /* Shared event channel */ 165550ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 165650ee6061SAndrew J. Bennieston "event-channel", "%u", queue->tx_evtchn); 165750ee6061SAndrew J. Bennieston if (err) { 165850ee6061SAndrew J. Bennieston message = "writing event-channel"; 165950ee6061SAndrew J. Bennieston goto error; 166050ee6061SAndrew J. Bennieston } 166150ee6061SAndrew J. Bennieston } else { 166250ee6061SAndrew J. Bennieston /* Split event channels */ 166350ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 166450ee6061SAndrew J. Bennieston "event-channel-tx", "%u", queue->tx_evtchn); 166550ee6061SAndrew J. Bennieston if (err) { 166650ee6061SAndrew J. Bennieston message = "writing event-channel-tx"; 166750ee6061SAndrew J. Bennieston goto error; 166850ee6061SAndrew J. Bennieston } 166950ee6061SAndrew J. Bennieston 167050ee6061SAndrew J. Bennieston err = xenbus_printf(*xbt, path, 167150ee6061SAndrew J. Bennieston "event-channel-rx", "%u", queue->rx_evtchn); 167250ee6061SAndrew J. Bennieston if (err) { 167350ee6061SAndrew J. Bennieston message = "writing event-channel-rx"; 167450ee6061SAndrew J. Bennieston goto error; 167550ee6061SAndrew J. Bennieston } 167650ee6061SAndrew J. Bennieston } 167750ee6061SAndrew J. Bennieston 167850ee6061SAndrew J. Bennieston if (write_hierarchical) 167950ee6061SAndrew J. Bennieston kfree(path); 168050ee6061SAndrew J. Bennieston return 0; 168150ee6061SAndrew J. Bennieston 168250ee6061SAndrew J. Bennieston error: 168350ee6061SAndrew J. Bennieston if (write_hierarchical) 168450ee6061SAndrew J. Bennieston kfree(path); 168550ee6061SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "%s", message); 168650ee6061SAndrew J. Bennieston return err; 168750ee6061SAndrew J. Bennieston } 168850ee6061SAndrew J. Bennieston 1689ce58725fSDavid Vrabel static void xennet_destroy_queues(struct netfront_info *info) 1690ce58725fSDavid Vrabel { 1691ce58725fSDavid Vrabel unsigned int i; 1692ce58725fSDavid Vrabel 1693ce58725fSDavid Vrabel rtnl_lock(); 1694ce58725fSDavid Vrabel 1695ce58725fSDavid Vrabel for (i = 0; i < info->netdev->real_num_tx_queues; i++) { 1696ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 1697ce58725fSDavid Vrabel 1698ce58725fSDavid Vrabel if (netif_running(info->netdev)) 1699ce58725fSDavid Vrabel napi_disable(&queue->napi); 1700ce58725fSDavid Vrabel netif_napi_del(&queue->napi); 1701ce58725fSDavid Vrabel } 1702ce58725fSDavid Vrabel 1703ce58725fSDavid Vrabel rtnl_unlock(); 1704ce58725fSDavid Vrabel 1705ce58725fSDavid Vrabel kfree(info->queues); 1706ce58725fSDavid Vrabel info->queues = NULL; 1707ce58725fSDavid Vrabel } 1708ce58725fSDavid Vrabel 1709ce58725fSDavid Vrabel static int xennet_create_queues(struct netfront_info *info, 1710ce58725fSDavid Vrabel unsigned int num_queues) 1711ce58725fSDavid Vrabel { 1712ce58725fSDavid Vrabel unsigned int i; 1713ce58725fSDavid Vrabel int ret; 1714ce58725fSDavid Vrabel 1715ce58725fSDavid Vrabel info->queues = kcalloc(num_queues, sizeof(struct netfront_queue), 1716ce58725fSDavid Vrabel GFP_KERNEL); 1717ce58725fSDavid Vrabel if (!info->queues) 1718ce58725fSDavid Vrabel return -ENOMEM; 1719ce58725fSDavid Vrabel 1720ce58725fSDavid Vrabel rtnl_lock(); 1721ce58725fSDavid Vrabel 1722ce58725fSDavid Vrabel for (i = 0; i < num_queues; i++) { 1723ce58725fSDavid Vrabel struct netfront_queue *queue = &info->queues[i]; 1724ce58725fSDavid Vrabel 1725ce58725fSDavid Vrabel queue->id = i; 1726ce58725fSDavid Vrabel queue->info = info; 1727ce58725fSDavid Vrabel 1728ce58725fSDavid Vrabel ret = xennet_init_queue(queue); 1729ce58725fSDavid Vrabel if (ret < 0) { 173069cb8524SDavid Vrabel dev_warn(&info->netdev->dev, 173169cb8524SDavid Vrabel "only created %d queues\n", i); 1732ce58725fSDavid Vrabel num_queues = i; 1733ce58725fSDavid Vrabel break; 1734ce58725fSDavid Vrabel } 1735ce58725fSDavid Vrabel 1736ce58725fSDavid Vrabel netif_napi_add(queue->info->netdev, &queue->napi, 1737ce58725fSDavid Vrabel xennet_poll, 64); 1738ce58725fSDavid Vrabel if (netif_running(info->netdev)) 1739ce58725fSDavid Vrabel napi_enable(&queue->napi); 1740ce58725fSDavid Vrabel } 1741ce58725fSDavid Vrabel 1742ce58725fSDavid Vrabel netif_set_real_num_tx_queues(info->netdev, num_queues); 1743ce58725fSDavid Vrabel 1744ce58725fSDavid Vrabel rtnl_unlock(); 1745ce58725fSDavid Vrabel 1746ce58725fSDavid Vrabel if (num_queues == 0) { 1747ce58725fSDavid Vrabel dev_err(&info->netdev->dev, "no queues\n"); 1748ce58725fSDavid Vrabel return -EINVAL; 1749ce58725fSDavid Vrabel } 1750ce58725fSDavid Vrabel return 0; 1751ce58725fSDavid Vrabel } 1752ce58725fSDavid Vrabel 17530d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 1754f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 17550d160211SJeremy Fitzhardinge struct netfront_info *info) 17560d160211SJeremy Fitzhardinge { 17570d160211SJeremy Fitzhardinge const char *message; 17580d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 17590d160211SJeremy Fitzhardinge int err; 17602688fcb7SAndrew J. Bennieston unsigned int feature_split_evtchn; 17612688fcb7SAndrew J. Bennieston unsigned int i = 0; 176250ee6061SAndrew J. Bennieston unsigned int max_queues = 0; 17632688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 17642688fcb7SAndrew J. Bennieston unsigned int num_queues = 1; 17650d160211SJeremy Fitzhardinge 17662688fcb7SAndrew J. Bennieston info->netdev->irq = 0; 17672688fcb7SAndrew J. Bennieston 176850ee6061SAndrew J. Bennieston /* Check if backend supports multiple queues */ 176950ee6061SAndrew J. Bennieston err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, 177050ee6061SAndrew J. Bennieston "multi-queue-max-queues", "%u", &max_queues); 177150ee6061SAndrew J. Bennieston if (err < 0) 177250ee6061SAndrew J. Bennieston max_queues = 1; 177350ee6061SAndrew J. Bennieston num_queues = min(max_queues, xennet_max_queues); 177450ee6061SAndrew J. Bennieston 17752688fcb7SAndrew J. Bennieston /* Check feature-split-event-channels */ 17762688fcb7SAndrew J. Bennieston err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, 17772688fcb7SAndrew J. Bennieston "feature-split-event-channels", "%u", 17782688fcb7SAndrew J. Bennieston &feature_split_evtchn); 17792688fcb7SAndrew J. Bennieston if (err < 0) 17802688fcb7SAndrew J. Bennieston feature_split_evtchn = 0; 17812688fcb7SAndrew J. Bennieston 17822688fcb7SAndrew J. Bennieston /* Read mac addr. */ 17832688fcb7SAndrew J. Bennieston err = xen_net_read_mac(dev, info->netdev->dev_addr); 17842688fcb7SAndrew J. Bennieston if (err) { 17852688fcb7SAndrew J. Bennieston xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 17860d160211SJeremy Fitzhardinge goto out; 17872688fcb7SAndrew J. Bennieston } 17882688fcb7SAndrew J. Bennieston 1789ce58725fSDavid Vrabel if (info->queues) 1790ce58725fSDavid Vrabel xennet_destroy_queues(info); 1791ce58725fSDavid Vrabel 1792ce58725fSDavid Vrabel err = xennet_create_queues(info, num_queues); 1793ce58725fSDavid Vrabel if (err < 0) 1794ce58725fSDavid Vrabel goto destroy_ring; 17952688fcb7SAndrew J. Bennieston 17962688fcb7SAndrew J. Bennieston /* Create shared ring, alloc event channel -- for each queue */ 17972688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 17982688fcb7SAndrew J. Bennieston queue = &info->queues[i]; 17992688fcb7SAndrew J. Bennieston err = setup_netfront(dev, queue, feature_split_evtchn); 18002688fcb7SAndrew J. Bennieston if (err) { 1801ce58725fSDavid Vrabel /* setup_netfront() will tidy up the current 1802ce58725fSDavid Vrabel * queue on error, but we need to clean up 18032688fcb7SAndrew J. Bennieston * those already allocated. 18042688fcb7SAndrew J. Bennieston */ 18052688fcb7SAndrew J. Bennieston if (i > 0) { 18062688fcb7SAndrew J. Bennieston rtnl_lock(); 18072688fcb7SAndrew J. Bennieston netif_set_real_num_tx_queues(info->netdev, i); 18082688fcb7SAndrew J. Bennieston rtnl_unlock(); 18092688fcb7SAndrew J. Bennieston goto destroy_ring; 18102688fcb7SAndrew J. Bennieston } else { 18112688fcb7SAndrew J. Bennieston goto out; 18122688fcb7SAndrew J. Bennieston } 18132688fcb7SAndrew J. Bennieston } 18142688fcb7SAndrew J. Bennieston } 18150d160211SJeremy Fitzhardinge 18160d160211SJeremy Fitzhardinge again: 18170d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 18180d160211SJeremy Fitzhardinge if (err) { 18190d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 18200d160211SJeremy Fitzhardinge goto destroy_ring; 18210d160211SJeremy Fitzhardinge } 18220d160211SJeremy Fitzhardinge 182350ee6061SAndrew J. Bennieston if (num_queues == 1) { 182450ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ 182550ee6061SAndrew J. Bennieston if (err) 182650ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 1827d634bf2cSWei Liu } else { 182850ee6061SAndrew J. Bennieston /* Write the number of queues */ 182950ee6061SAndrew J. Bennieston err = xenbus_printf(xbt, dev->nodename, "multi-queue-num-queues", 183050ee6061SAndrew J. Bennieston "%u", num_queues); 1831d634bf2cSWei Liu if (err) { 183250ee6061SAndrew J. Bennieston message = "writing multi-queue-num-queues"; 183350ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 1834d634bf2cSWei Liu } 183550ee6061SAndrew J. Bennieston 183650ee6061SAndrew J. Bennieston /* Write the keys for each queue */ 183750ee6061SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 183850ee6061SAndrew J. Bennieston queue = &info->queues[i]; 183950ee6061SAndrew J. Bennieston err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ 184050ee6061SAndrew J. Bennieston if (err) 184150ee6061SAndrew J. Bennieston goto abort_transaction_no_dev_fatal; 1842d634bf2cSWei Liu } 1843d634bf2cSWei Liu } 18440d160211SJeremy Fitzhardinge 184550ee6061SAndrew J. Bennieston /* The remaining keys are not queue-specific */ 18460d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 18470d160211SJeremy Fitzhardinge 1); 18480d160211SJeremy Fitzhardinge if (err) { 18490d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 18500d160211SJeremy Fitzhardinge goto abort_transaction; 18510d160211SJeremy Fitzhardinge } 18520d160211SJeremy Fitzhardinge 18530d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 18540d160211SJeremy Fitzhardinge if (err) { 18550d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 18560d160211SJeremy Fitzhardinge goto abort_transaction; 18570d160211SJeremy Fitzhardinge } 18580d160211SJeremy Fitzhardinge 18590d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 18600d160211SJeremy Fitzhardinge if (err) { 18610d160211SJeremy Fitzhardinge message = "writing feature-sg"; 18620d160211SJeremy Fitzhardinge goto abort_transaction; 18630d160211SJeremy Fitzhardinge } 18640d160211SJeremy Fitzhardinge 18650d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 18660d160211SJeremy Fitzhardinge if (err) { 18670d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 18680d160211SJeremy Fitzhardinge goto abort_transaction; 18690d160211SJeremy Fitzhardinge } 18700d160211SJeremy Fitzhardinge 18712c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); 18722c0057deSPaul Durrant if (err) { 18732c0057deSPaul Durrant message = "writing feature-gso-tcpv6"; 18742c0057deSPaul Durrant goto abort_transaction; 18752c0057deSPaul Durrant } 18762c0057deSPaul Durrant 18772c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", 18782c0057deSPaul Durrant "1"); 18792c0057deSPaul Durrant if (err) { 18802c0057deSPaul Durrant message = "writing feature-ipv6-csum-offload"; 18812c0057deSPaul Durrant goto abort_transaction; 18822c0057deSPaul Durrant } 18832c0057deSPaul Durrant 18840d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 18850d160211SJeremy Fitzhardinge if (err) { 18860d160211SJeremy Fitzhardinge if (err == -EAGAIN) 18870d160211SJeremy Fitzhardinge goto again; 18880d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 18890d160211SJeremy Fitzhardinge goto destroy_ring; 18900d160211SJeremy Fitzhardinge } 18910d160211SJeremy Fitzhardinge 18920d160211SJeremy Fitzhardinge return 0; 18930d160211SJeremy Fitzhardinge 18940d160211SJeremy Fitzhardinge abort_transaction: 18950d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 189650ee6061SAndrew J. Bennieston abort_transaction_no_dev_fatal: 189750ee6061SAndrew J. Bennieston xenbus_transaction_end(xbt, 1); 18980d160211SJeremy Fitzhardinge destroy_ring: 18990d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 19002688fcb7SAndrew J. Bennieston kfree(info->queues); 19012688fcb7SAndrew J. Bennieston info->queues = NULL; 19022688fcb7SAndrew J. Bennieston rtnl_lock(); 19032688fcb7SAndrew J. Bennieston netif_set_real_num_tx_queues(info->netdev, 0); 1904db8c8ab6SDavid Vrabel rtnl_unlock(); 19050d160211SJeremy Fitzhardinge out: 19060d160211SJeremy Fitzhardinge return err; 19070d160211SJeremy Fitzhardinge } 19080d160211SJeremy Fitzhardinge 19090d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 19100d160211SJeremy Fitzhardinge { 19110d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 19122688fcb7SAndrew J. Bennieston unsigned int num_queues = 0; 1913a5b5dc3cSDavid Vrabel int err; 19140d160211SJeremy Fitzhardinge unsigned int feature_rx_copy; 19152688fcb7SAndrew J. Bennieston unsigned int j = 0; 19162688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 19170d160211SJeremy Fitzhardinge 19180d160211SJeremy Fitzhardinge err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, 19190d160211SJeremy Fitzhardinge "feature-rx-copy", "%u", &feature_rx_copy); 19200d160211SJeremy Fitzhardinge if (err != 1) 19210d160211SJeremy Fitzhardinge feature_rx_copy = 0; 19220d160211SJeremy Fitzhardinge 19230d160211SJeremy Fitzhardinge if (!feature_rx_copy) { 19240d160211SJeremy Fitzhardinge dev_info(&dev->dev, 1925898eb71cSJoe Perches "backend does not support copying receive path\n"); 19260d160211SJeremy Fitzhardinge return -ENODEV; 19270d160211SJeremy Fitzhardinge } 19280d160211SJeremy Fitzhardinge 1929f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 19300d160211SJeremy Fitzhardinge if (err) 19310d160211SJeremy Fitzhardinge return err; 19320d160211SJeremy Fitzhardinge 19332688fcb7SAndrew J. Bennieston /* talk_to_netback() sets the correct number of queues */ 19342688fcb7SAndrew J. Bennieston num_queues = dev->real_num_tx_queues; 19352688fcb7SAndrew J. Bennieston 19361ba37c51SIan Campbell rtnl_lock(); 1937fb507934SMichał Mirosław netdev_update_features(dev); 19381ba37c51SIan Campbell rtnl_unlock(); 19390d160211SJeremy Fitzhardinge 19400d160211SJeremy Fitzhardinge /* 1941a5b5dc3cSDavid Vrabel * All public and private state should now be sane. Get 19420d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 19430d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 19440d160211SJeremy Fitzhardinge * packets. 19450d160211SJeremy Fitzhardinge */ 19460d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 19472688fcb7SAndrew J. Bennieston for (j = 0; j < num_queues; ++j) { 19482688fcb7SAndrew J. Bennieston queue = &np->queues[j]; 1949f50b4076SDavid Vrabel 19502688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->tx_irq); 19512688fcb7SAndrew J. Bennieston if (queue->tx_irq != queue->rx_irq) 19522688fcb7SAndrew J. Bennieston notify_remote_via_irq(queue->rx_irq); 19530d160211SJeremy Fitzhardinge 1954f50b4076SDavid Vrabel spin_lock_irq(&queue->tx_lock); 1955f50b4076SDavid Vrabel xennet_tx_buf_gc(queue); 19562688fcb7SAndrew J. Bennieston spin_unlock_irq(&queue->tx_lock); 1957f50b4076SDavid Vrabel 1958f50b4076SDavid Vrabel spin_lock_bh(&queue->rx_lock); 1959f50b4076SDavid Vrabel xennet_alloc_rx_buffers(queue); 19602688fcb7SAndrew J. Bennieston spin_unlock_bh(&queue->rx_lock); 19612688fcb7SAndrew J. Bennieston } 19620d160211SJeremy Fitzhardinge 19630d160211SJeremy Fitzhardinge return 0; 19640d160211SJeremy Fitzhardinge } 19650d160211SJeremy Fitzhardinge 19660d160211SJeremy Fitzhardinge /** 19670d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 19680d160211SJeremy Fitzhardinge */ 1969f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 19700d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 19710d160211SJeremy Fitzhardinge { 19721b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 19730d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 19740d160211SJeremy Fitzhardinge 19750d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 19760d160211SJeremy Fitzhardinge 19770d160211SJeremy Fitzhardinge switch (backend_state) { 19780d160211SJeremy Fitzhardinge case XenbusStateInitialising: 19790d160211SJeremy Fitzhardinge case XenbusStateInitialised: 1980b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 1981b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 19820d160211SJeremy Fitzhardinge case XenbusStateUnknown: 19830d160211SJeremy Fitzhardinge break; 19840d160211SJeremy Fitzhardinge 19850d160211SJeremy Fitzhardinge case XenbusStateInitWait: 19860d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 19870d160211SJeremy Fitzhardinge break; 19880d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 19890d160211SJeremy Fitzhardinge break; 19900d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 199108e34eb1SLaszlo Ersek break; 199208e34eb1SLaszlo Ersek 199308e34eb1SLaszlo Ersek case XenbusStateConnected: 1994ee89bab1SAmerigo Wang netdev_notify_peers(netdev); 19950d160211SJeremy Fitzhardinge break; 19960d160211SJeremy Fitzhardinge 1997bce3ea81SDavid Vrabel case XenbusStateClosed: 1998bce3ea81SDavid Vrabel if (dev->state == XenbusStateClosed) 1999bce3ea81SDavid Vrabel break; 2000bce3ea81SDavid Vrabel /* Missed the backend's CLOSING state -- fallthrough */ 20010d160211SJeremy Fitzhardinge case XenbusStateClosing: 20020d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 20030d160211SJeremy Fitzhardinge break; 20040d160211SJeremy Fitzhardinge } 20050d160211SJeremy Fitzhardinge } 20060d160211SJeremy Fitzhardinge 2007e0ce4af9SIan Campbell static const struct xennet_stat { 2008e0ce4af9SIan Campbell char name[ETH_GSTRING_LEN]; 2009e0ce4af9SIan Campbell u16 offset; 2010e0ce4af9SIan Campbell } xennet_stats[] = { 2011e0ce4af9SIan Campbell { 2012e0ce4af9SIan Campbell "rx_gso_checksum_fixup", 2013e0ce4af9SIan Campbell offsetof(struct netfront_info, rx_gso_checksum_fixup) 2014e0ce4af9SIan Campbell }, 2015e0ce4af9SIan Campbell }; 2016e0ce4af9SIan Campbell 2017e0ce4af9SIan Campbell static int xennet_get_sset_count(struct net_device *dev, int string_set) 2018e0ce4af9SIan Campbell { 2019e0ce4af9SIan Campbell switch (string_set) { 2020e0ce4af9SIan Campbell case ETH_SS_STATS: 2021e0ce4af9SIan Campbell return ARRAY_SIZE(xennet_stats); 2022e0ce4af9SIan Campbell default: 2023e0ce4af9SIan Campbell return -EINVAL; 2024e0ce4af9SIan Campbell } 2025e0ce4af9SIan Campbell } 2026e0ce4af9SIan Campbell 2027e0ce4af9SIan Campbell static void xennet_get_ethtool_stats(struct net_device *dev, 2028e0ce4af9SIan Campbell struct ethtool_stats *stats, u64 * data) 2029e0ce4af9SIan Campbell { 2030e0ce4af9SIan Campbell void *np = netdev_priv(dev); 2031e0ce4af9SIan Campbell int i; 2032e0ce4af9SIan Campbell 2033e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 20342688fcb7SAndrew J. Bennieston data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); 2035e0ce4af9SIan Campbell } 2036e0ce4af9SIan Campbell 2037e0ce4af9SIan Campbell static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) 2038e0ce4af9SIan Campbell { 2039e0ce4af9SIan Campbell int i; 2040e0ce4af9SIan Campbell 2041e0ce4af9SIan Campbell switch (stringset) { 2042e0ce4af9SIan Campbell case ETH_SS_STATS: 2043e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 2044e0ce4af9SIan Campbell memcpy(data + i * ETH_GSTRING_LEN, 2045e0ce4af9SIan Campbell xennet_stats[i].name, ETH_GSTRING_LEN); 2046e0ce4af9SIan Campbell break; 2047e0ce4af9SIan Campbell } 2048e0ce4af9SIan Campbell } 2049e0ce4af9SIan Campbell 20500fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 20510d160211SJeremy Fitzhardinge { 20520d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 2053e0ce4af9SIan Campbell 2054e0ce4af9SIan Campbell .get_sset_count = xennet_get_sset_count, 2055e0ce4af9SIan Campbell .get_ethtool_stats = xennet_get_ethtool_stats, 2056e0ce4af9SIan Campbell .get_strings = xennet_get_strings, 20570d160211SJeremy Fitzhardinge }; 20580d160211SJeremy Fitzhardinge 20590d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 20601f3c2ebaSDavid Vrabel static ssize_t show_rxbuf(struct device *dev, 20610d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 20620d160211SJeremy Fitzhardinge { 20631f3c2ebaSDavid Vrabel return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); 20640d160211SJeremy Fitzhardinge } 20650d160211SJeremy Fitzhardinge 20661f3c2ebaSDavid Vrabel static ssize_t store_rxbuf(struct device *dev, 20670d160211SJeremy Fitzhardinge struct device_attribute *attr, 20680d160211SJeremy Fitzhardinge const char *buf, size_t len) 20690d160211SJeremy Fitzhardinge { 20700d160211SJeremy Fitzhardinge char *endp; 20710d160211SJeremy Fitzhardinge unsigned long target; 20720d160211SJeremy Fitzhardinge 20730d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 20740d160211SJeremy Fitzhardinge return -EPERM; 20750d160211SJeremy Fitzhardinge 20760d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 20770d160211SJeremy Fitzhardinge if (endp == buf) 20780d160211SJeremy Fitzhardinge return -EBADMSG; 20790d160211SJeremy Fitzhardinge 20801f3c2ebaSDavid Vrabel /* rxbuf_min and rxbuf_max are no longer configurable. */ 20810d160211SJeremy Fitzhardinge 20820d160211SJeremy Fitzhardinge return len; 20830d160211SJeremy Fitzhardinge } 20840d160211SJeremy Fitzhardinge 208527b917e5STakashi Iwai static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); 208627b917e5STakashi Iwai static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); 208727b917e5STakashi Iwai static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL); 208827b917e5STakashi Iwai 208927b917e5STakashi Iwai static struct attribute *xennet_dev_attrs[] = { 209027b917e5STakashi Iwai &dev_attr_rxbuf_min.attr, 209127b917e5STakashi Iwai &dev_attr_rxbuf_max.attr, 209227b917e5STakashi Iwai &dev_attr_rxbuf_cur.attr, 209327b917e5STakashi Iwai NULL 20940d160211SJeremy Fitzhardinge }; 20950d160211SJeremy Fitzhardinge 209627b917e5STakashi Iwai static const struct attribute_group xennet_dev_group = { 209727b917e5STakashi Iwai .attrs = xennet_dev_attrs 209827b917e5STakashi Iwai }; 20990d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 21000d160211SJeremy Fitzhardinge 21018e0e46bbSBill Pemberton static int xennet_remove(struct xenbus_device *dev) 21020d160211SJeremy Fitzhardinge { 21031b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 21042688fcb7SAndrew J. Bennieston unsigned int num_queues = info->netdev->real_num_tx_queues; 21052688fcb7SAndrew J. Bennieston struct netfront_queue *queue = NULL; 21062688fcb7SAndrew J. Bennieston unsigned int i = 0; 21070d160211SJeremy Fitzhardinge 21080d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 21090d160211SJeremy Fitzhardinge 21100d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 21110d160211SJeremy Fitzhardinge 21126bc96d04SIan Campbell unregister_netdev(info->netdev); 21136bc96d04SIan Campbell 21142688fcb7SAndrew J. Bennieston for (i = 0; i < num_queues; ++i) { 21152688fcb7SAndrew J. Bennieston queue = &info->queues[i]; 21162688fcb7SAndrew J. Bennieston del_timer_sync(&queue->rx_refill_timer); 21172688fcb7SAndrew J. Bennieston } 21182688fcb7SAndrew J. Bennieston 21192688fcb7SAndrew J. Bennieston if (num_queues) { 21202688fcb7SAndrew J. Bennieston kfree(info->queues); 21212688fcb7SAndrew J. Bennieston info->queues = NULL; 21222688fcb7SAndrew J. Bennieston } 21236bc96d04SIan Campbell 2124900e1833SDavid Vrabel xennet_free_netdev(info->netdev); 21250d160211SJeremy Fitzhardinge 21260d160211SJeremy Fitzhardinge return 0; 21270d160211SJeremy Fitzhardinge } 21280d160211SJeremy Fitzhardinge 212995afae48SDavid Vrabel static const struct xenbus_device_id netfront_ids[] = { 213095afae48SDavid Vrabel { "vif" }, 213195afae48SDavid Vrabel { "" } 213295afae48SDavid Vrabel }; 213395afae48SDavid Vrabel 213495afae48SDavid Vrabel static struct xenbus_driver netfront_driver = { 213595afae48SDavid Vrabel .ids = netfront_ids, 21360d160211SJeremy Fitzhardinge .probe = netfront_probe, 21378e0e46bbSBill Pemberton .remove = xennet_remove, 21380d160211SJeremy Fitzhardinge .resume = netfront_resume, 2139f502bf2bSIan Campbell .otherend_changed = netback_changed, 214095afae48SDavid Vrabel }; 21410d160211SJeremy Fitzhardinge 21420d160211SJeremy Fitzhardinge static int __init netif_init(void) 21430d160211SJeremy Fitzhardinge { 21446e833587SJeremy Fitzhardinge if (!xen_domain()) 21450d160211SJeremy Fitzhardinge return -ENODEV; 21460d160211SJeremy Fitzhardinge 214751c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_nic_devices()) 2148b9136d20SIgor Mammedov return -ENODEV; 2149b9136d20SIgor Mammedov 2150383eda32SJoe Perches pr_info("Initialising Xen virtual ethernet driver\n"); 21510d160211SJeremy Fitzhardinge 215250ee6061SAndrew J. Bennieston /* Allow as many queues as there are CPUs, by default */ 215350ee6061SAndrew J. Bennieston xennet_max_queues = num_online_cpus(); 215450ee6061SAndrew J. Bennieston 2155ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 21560d160211SJeremy Fitzhardinge } 21570d160211SJeremy Fitzhardinge module_init(netif_init); 21580d160211SJeremy Fitzhardinge 21590d160211SJeremy Fitzhardinge 21600d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 21610d160211SJeremy Fitzhardinge { 2162ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 21630d160211SJeremy Fitzhardinge } 21640d160211SJeremy Fitzhardinge module_exit(netif_exit); 21650d160211SJeremy Fitzhardinge 21660d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 21670d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 2168d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 21694f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 2170