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 600fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 610d160211SJeremy Fitzhardinge 620d160211SJeremy Fitzhardinge struct netfront_cb { 633683243bSIan Campbell int pull_to; 640d160211SJeremy Fitzhardinge }; 650d160211SJeremy Fitzhardinge 660d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 670d160211SJeremy Fitzhardinge 680d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 690d160211SJeremy Fitzhardinge 700d160211SJeremy Fitzhardinge #define GRANT_INVALID_REF 0 710d160211SJeremy Fitzhardinge 72667c78afSJeremy Fitzhardinge #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) 73667c78afSJeremy Fitzhardinge #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) 7440206dd9SWei Liu #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256) 750d160211SJeremy Fitzhardinge 76e00f85beSstephen hemminger struct netfront_stats { 77e00f85beSstephen hemminger u64 rx_packets; 78e00f85beSstephen hemminger u64 tx_packets; 79e00f85beSstephen hemminger u64 rx_bytes; 80e00f85beSstephen hemminger u64 tx_bytes; 81e00f85beSstephen hemminger struct u64_stats_sync syncp; 82e00f85beSstephen hemminger }; 83e00f85beSstephen hemminger 840d160211SJeremy Fitzhardinge struct netfront_info { 850d160211SJeremy Fitzhardinge struct list_head list; 860d160211SJeremy Fitzhardinge struct net_device *netdev; 870d160211SJeremy Fitzhardinge 88bea3348eSStephen Hemminger struct napi_struct napi; 890d160211SJeremy Fitzhardinge 90d634bf2cSWei Liu /* Split event channels support, tx_* == rx_* when using 91d634bf2cSWei Liu * single event channel. 92d634bf2cSWei Liu */ 93d634bf2cSWei Liu unsigned int tx_evtchn, rx_evtchn; 94d634bf2cSWei Liu unsigned int tx_irq, rx_irq; 95d634bf2cSWei Liu /* Only used when split event channels support is enabled */ 96d634bf2cSWei Liu char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */ 97d634bf2cSWei Liu char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */ 98d634bf2cSWei Liu 9984284d3cSJeremy Fitzhardinge struct xenbus_device *xbdev; 1000d160211SJeremy Fitzhardinge 1010d160211SJeremy Fitzhardinge spinlock_t tx_lock; 10284284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 10384284d3cSJeremy Fitzhardinge int tx_ring_ref; 1040d160211SJeremy Fitzhardinge 1050d160211SJeremy Fitzhardinge /* 1060d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 1070d160211SJeremy Fitzhardinge * are linked from tx_skb_freelist through skb_entry.link. 1080d160211SJeremy Fitzhardinge * 1090d160211SJeremy Fitzhardinge * NB. Freelist index entries are always going to be less than 1100d160211SJeremy Fitzhardinge * PAGE_OFFSET, whereas pointers to skbs will always be equal or 1110d160211SJeremy Fitzhardinge * greater than PAGE_OFFSET: we use this property to distinguish 1120d160211SJeremy Fitzhardinge * them. 1130d160211SJeremy Fitzhardinge */ 1140d160211SJeremy Fitzhardinge union skb_entry { 1150d160211SJeremy Fitzhardinge struct sk_buff *skb; 1161ffb40b8SIsaku Yamahata unsigned long link; 1170d160211SJeremy Fitzhardinge } tx_skbs[NET_TX_RING_SIZE]; 1180d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1190d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 120cefe0078SAnnie Li struct page *grant_tx_page[NET_TX_RING_SIZE]; 1210d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 1220d160211SJeremy Fitzhardinge 12384284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 12484284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 12584284d3cSJeremy Fitzhardinge int rx_ring_ref; 12684284d3cSJeremy Fitzhardinge 12784284d3cSJeremy Fitzhardinge /* Receive-ring batched refills. */ 12884284d3cSJeremy Fitzhardinge #define RX_MIN_TARGET 8 12984284d3cSJeremy Fitzhardinge #define RX_DFL_MIN_TARGET 64 13084284d3cSJeremy Fitzhardinge #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) 13184284d3cSJeremy Fitzhardinge unsigned rx_min_target, rx_max_target, rx_target; 13284284d3cSJeremy Fitzhardinge struct sk_buff_head rx_batch; 13384284d3cSJeremy Fitzhardinge 13484284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 13584284d3cSJeremy Fitzhardinge 1360d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1370d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1380d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1390d160211SJeremy Fitzhardinge 1400d160211SJeremy Fitzhardinge unsigned long rx_pfn_array[NET_RX_RING_SIZE]; 1410d160211SJeremy Fitzhardinge struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; 1420d160211SJeremy Fitzhardinge struct mmu_update rx_mmu[NET_RX_RING_SIZE]; 143e0ce4af9SIan Campbell 144e0ce4af9SIan Campbell /* Statistics */ 145e00f85beSstephen hemminger struct netfront_stats __percpu *stats; 146e00f85beSstephen hemminger 147e9a799eaSIan Campbell unsigned long rx_gso_checksum_fixup; 1480d160211SJeremy Fitzhardinge }; 1490d160211SJeremy Fitzhardinge 1500d160211SJeremy Fitzhardinge struct netfront_rx_info { 1510d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1520d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1530d160211SJeremy Fitzhardinge }; 1540d160211SJeremy Fitzhardinge 1551ffb40b8SIsaku Yamahata static void skb_entry_set_link(union skb_entry *list, unsigned short id) 1561ffb40b8SIsaku Yamahata { 1571ffb40b8SIsaku Yamahata list->link = id; 1581ffb40b8SIsaku Yamahata } 1591ffb40b8SIsaku Yamahata 1601ffb40b8SIsaku Yamahata static int skb_entry_is_link(const union skb_entry *list) 1611ffb40b8SIsaku Yamahata { 1621ffb40b8SIsaku Yamahata BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); 163807540baSEric Dumazet return (unsigned long)list->skb < PAGE_OFFSET; 1641ffb40b8SIsaku Yamahata } 1651ffb40b8SIsaku Yamahata 1660d160211SJeremy Fitzhardinge /* 1670d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1680d160211SJeremy Fitzhardinge */ 1690d160211SJeremy Fitzhardinge 1700d160211SJeremy Fitzhardinge static void add_id_to_freelist(unsigned *head, union skb_entry *list, 1710d160211SJeremy Fitzhardinge unsigned short id) 1720d160211SJeremy Fitzhardinge { 1731ffb40b8SIsaku Yamahata skb_entry_set_link(&list[id], *head); 1740d160211SJeremy Fitzhardinge *head = id; 1750d160211SJeremy Fitzhardinge } 1760d160211SJeremy Fitzhardinge 1770d160211SJeremy Fitzhardinge static unsigned short get_id_from_freelist(unsigned *head, 1780d160211SJeremy Fitzhardinge union skb_entry *list) 1790d160211SJeremy Fitzhardinge { 1800d160211SJeremy Fitzhardinge unsigned int id = *head; 1810d160211SJeremy Fitzhardinge *head = list[id].link; 1820d160211SJeremy Fitzhardinge return id; 1830d160211SJeremy Fitzhardinge } 1840d160211SJeremy Fitzhardinge 1850d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 1860d160211SJeremy Fitzhardinge { 1870d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 1880d160211SJeremy Fitzhardinge } 1890d160211SJeremy Fitzhardinge 1900d160211SJeremy Fitzhardinge static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, 1910d160211SJeremy Fitzhardinge RING_IDX ri) 1920d160211SJeremy Fitzhardinge { 1930d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 1940d160211SJeremy Fitzhardinge struct sk_buff *skb = np->rx_skbs[i]; 1950d160211SJeremy Fitzhardinge np->rx_skbs[i] = NULL; 1960d160211SJeremy Fitzhardinge return skb; 1970d160211SJeremy Fitzhardinge } 1980d160211SJeremy Fitzhardinge 1990d160211SJeremy Fitzhardinge static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, 2000d160211SJeremy Fitzhardinge RING_IDX ri) 2010d160211SJeremy Fitzhardinge { 2020d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 2030d160211SJeremy Fitzhardinge grant_ref_t ref = np->grant_rx_ref[i]; 2040d160211SJeremy Fitzhardinge np->grant_rx_ref[i] = GRANT_INVALID_REF; 2050d160211SJeremy Fitzhardinge return ref; 2060d160211SJeremy Fitzhardinge } 2070d160211SJeremy Fitzhardinge 2080d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 2090d160211SJeremy Fitzhardinge static int xennet_sysfs_addif(struct net_device *netdev); 2100d160211SJeremy Fitzhardinge static void xennet_sysfs_delif(struct net_device *netdev); 2110d160211SJeremy Fitzhardinge #else /* !CONFIG_SYSFS */ 2120d160211SJeremy Fitzhardinge #define xennet_sysfs_addif(dev) (0) 2130d160211SJeremy Fitzhardinge #define xennet_sysfs_delif(dev) do { } while (0) 2140d160211SJeremy Fitzhardinge #endif 2150d160211SJeremy Fitzhardinge 2163ad9b358SMichał Mirosław static bool xennet_can_sg(struct net_device *dev) 2170d160211SJeremy Fitzhardinge { 2183ad9b358SMichał Mirosław return dev->features & NETIF_F_SG; 2190d160211SJeremy Fitzhardinge } 2200d160211SJeremy Fitzhardinge 2210d160211SJeremy Fitzhardinge 2220d160211SJeremy Fitzhardinge static void rx_refill_timeout(unsigned long data) 2230d160211SJeremy Fitzhardinge { 2240d160211SJeremy Fitzhardinge struct net_device *dev = (struct net_device *)data; 225bea3348eSStephen Hemminger struct netfront_info *np = netdev_priv(dev); 226288379f0SBen Hutchings napi_schedule(&np->napi); 2270d160211SJeremy Fitzhardinge } 2280d160211SJeremy Fitzhardinge 2290d160211SJeremy Fitzhardinge static int netfront_tx_slot_available(struct netfront_info *np) 2300d160211SJeremy Fitzhardinge { 231807540baSEric Dumazet return (np->tx.req_prod_pvt - np->tx.rsp_cons) < 232807540baSEric Dumazet (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); 2330d160211SJeremy Fitzhardinge } 2340d160211SJeremy Fitzhardinge 2350d160211SJeremy Fitzhardinge static void xennet_maybe_wake_tx(struct net_device *dev) 2360d160211SJeremy Fitzhardinge { 2370d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 2380d160211SJeremy Fitzhardinge 2390d160211SJeremy Fitzhardinge if (unlikely(netif_queue_stopped(dev)) && 2400d160211SJeremy Fitzhardinge netfront_tx_slot_available(np) && 2410d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2420d160211SJeremy Fitzhardinge netif_wake_queue(dev); 2430d160211SJeremy Fitzhardinge } 2440d160211SJeremy Fitzhardinge 2450d160211SJeremy Fitzhardinge static void xennet_alloc_rx_buffers(struct net_device *dev) 2460d160211SJeremy Fitzhardinge { 2470d160211SJeremy Fitzhardinge unsigned short id; 2480d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 2490d160211SJeremy Fitzhardinge struct sk_buff *skb; 2500d160211SJeremy Fitzhardinge struct page *page; 2510d160211SJeremy Fitzhardinge int i, batch_target, notify; 2520d160211SJeremy Fitzhardinge RING_IDX req_prod = np->rx.req_prod_pvt; 2530d160211SJeremy Fitzhardinge grant_ref_t ref; 2540d160211SJeremy Fitzhardinge unsigned long pfn; 2550d160211SJeremy Fitzhardinge void *vaddr; 2560d160211SJeremy Fitzhardinge struct xen_netif_rx_request *req; 2570d160211SJeremy Fitzhardinge 2580d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev))) 2590d160211SJeremy Fitzhardinge return; 2600d160211SJeremy Fitzhardinge 2610d160211SJeremy Fitzhardinge /* 2620d160211SJeremy Fitzhardinge * Allocate skbuffs greedily, even though we batch updates to the 2630d160211SJeremy Fitzhardinge * receive ring. This creates a less bursty demand on the memory 2640d160211SJeremy Fitzhardinge * allocator, so should reduce the chance of failed allocation requests 2650d160211SJeremy Fitzhardinge * both for ourself and for other kernel subsystems. 2660d160211SJeremy Fitzhardinge */ 2670d160211SJeremy Fitzhardinge batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); 2680d160211SJeremy Fitzhardinge for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { 269617a20bbSIsaku Yamahata skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, 2700d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2710d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2720d160211SJeremy Fitzhardinge goto no_skb; 2730d160211SJeremy Fitzhardinge 274617a20bbSIsaku Yamahata /* Align ip header to a 16 bytes boundary */ 275617a20bbSIsaku Yamahata skb_reserve(skb, NET_IP_ALIGN); 276617a20bbSIsaku Yamahata 2770d160211SJeremy Fitzhardinge page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); 2780d160211SJeremy Fitzhardinge if (!page) { 2790d160211SJeremy Fitzhardinge kfree_skb(skb); 2800d160211SJeremy Fitzhardinge no_skb: 2810d160211SJeremy Fitzhardinge /* Could not allocate any skbuffs. Try again later. */ 2820d160211SJeremy Fitzhardinge mod_timer(&np->rx_refill_timer, 2830d160211SJeremy Fitzhardinge jiffies + (HZ/10)); 284fdcf7765SMa JieYue 285fdcf7765SMa JieYue /* Any skbuffs queued for refill? Force them out. */ 286fdcf7765SMa JieYue if (i != 0) 287fdcf7765SMa JieYue goto refill; 2880d160211SJeremy Fitzhardinge break; 2890d160211SJeremy Fitzhardinge } 2900d160211SJeremy Fitzhardinge 291093b9c71SJan Beulich skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); 2920d160211SJeremy Fitzhardinge __skb_queue_tail(&np->rx_batch, skb); 2930d160211SJeremy Fitzhardinge } 2940d160211SJeremy Fitzhardinge 2950d160211SJeremy Fitzhardinge /* Is the batch large enough to be worthwhile? */ 2960d160211SJeremy Fitzhardinge if (i < (np->rx_target/2)) { 2970d160211SJeremy Fitzhardinge if (req_prod > np->rx.sring->req_prod) 2980d160211SJeremy Fitzhardinge goto push; 2990d160211SJeremy Fitzhardinge return; 3000d160211SJeremy Fitzhardinge } 3010d160211SJeremy Fitzhardinge 3020d160211SJeremy Fitzhardinge /* Adjust our fill target if we risked running out of buffers. */ 3030d160211SJeremy Fitzhardinge if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && 3040d160211SJeremy Fitzhardinge ((np->rx_target *= 2) > np->rx_max_target)) 3050d160211SJeremy Fitzhardinge np->rx_target = np->rx_max_target; 3060d160211SJeremy Fitzhardinge 3070d160211SJeremy Fitzhardinge refill: 3085dcddfaeSJeremy Fitzhardinge for (i = 0; ; i++) { 3090d160211SJeremy Fitzhardinge skb = __skb_dequeue(&np->rx_batch); 3100d160211SJeremy Fitzhardinge if (skb == NULL) 3110d160211SJeremy Fitzhardinge break; 3120d160211SJeremy Fitzhardinge 3130d160211SJeremy Fitzhardinge skb->dev = dev; 3140d160211SJeremy Fitzhardinge 3150d160211SJeremy Fitzhardinge id = xennet_rxidx(req_prod + i); 3160d160211SJeremy Fitzhardinge 3170d160211SJeremy Fitzhardinge BUG_ON(np->rx_skbs[id]); 3180d160211SJeremy Fitzhardinge np->rx_skbs[id] = skb; 3190d160211SJeremy Fitzhardinge 3200d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_rx_head); 3210d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 3220d160211SJeremy Fitzhardinge np->grant_rx_ref[id] = ref; 3230d160211SJeremy Fitzhardinge 32401c68026SIan Campbell pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); 32501c68026SIan Campbell vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); 3260d160211SJeremy Fitzhardinge 3270d160211SJeremy Fitzhardinge req = RING_GET_REQUEST(&np->rx, req_prod + i); 3280d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref(ref, 3290d160211SJeremy Fitzhardinge np->xbdev->otherend_id, 3300d160211SJeremy Fitzhardinge pfn_to_mfn(pfn), 3310d160211SJeremy Fitzhardinge 0); 3320d160211SJeremy Fitzhardinge 3330d160211SJeremy Fitzhardinge req->id = id; 3340d160211SJeremy Fitzhardinge req->gref = ref; 3350d160211SJeremy Fitzhardinge } 3360d160211SJeremy Fitzhardinge 3370d160211SJeremy Fitzhardinge wmb(); /* barrier so backend seens requests */ 3380d160211SJeremy Fitzhardinge 3390d160211SJeremy Fitzhardinge /* Above is a suitable barrier to ensure backend will see requests. */ 3400d160211SJeremy Fitzhardinge np->rx.req_prod_pvt = req_prod + i; 3410d160211SJeremy Fitzhardinge push: 3420d160211SJeremy Fitzhardinge RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); 3430d160211SJeremy Fitzhardinge if (notify) 344d634bf2cSWei Liu notify_remote_via_irq(np->rx_irq); 3450d160211SJeremy Fitzhardinge } 3460d160211SJeremy Fitzhardinge 3470d160211SJeremy Fitzhardinge static int xennet_open(struct net_device *dev) 3480d160211SJeremy Fitzhardinge { 3490d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3500d160211SJeremy Fitzhardinge 351bea3348eSStephen Hemminger napi_enable(&np->napi); 352bea3348eSStephen Hemminger 3530d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 3540d160211SJeremy Fitzhardinge if (netif_carrier_ok(dev)) { 3550d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(dev); 3560d160211SJeremy Fitzhardinge np->rx.sring->rsp_event = np->rx.rsp_cons + 1; 3570d160211SJeremy Fitzhardinge if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) 358288379f0SBen Hutchings napi_schedule(&np->napi); 3590d160211SJeremy Fitzhardinge } 3600d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 3610d160211SJeremy Fitzhardinge 3620b1ab1b8SEduardo Habkost netif_start_queue(dev); 3630d160211SJeremy Fitzhardinge 3640d160211SJeremy Fitzhardinge return 0; 3650d160211SJeremy Fitzhardinge } 3660d160211SJeremy Fitzhardinge 3670d160211SJeremy Fitzhardinge static void xennet_tx_buf_gc(struct net_device *dev) 3680d160211SJeremy Fitzhardinge { 3690d160211SJeremy Fitzhardinge RING_IDX cons, prod; 3700d160211SJeremy Fitzhardinge unsigned short id; 3710d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3720d160211SJeremy Fitzhardinge struct sk_buff *skb; 3730d160211SJeremy Fitzhardinge 3740d160211SJeremy Fitzhardinge BUG_ON(!netif_carrier_ok(dev)); 3750d160211SJeremy Fitzhardinge 3760d160211SJeremy Fitzhardinge do { 3770d160211SJeremy Fitzhardinge prod = np->tx.sring->rsp_prod; 3780d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 3790d160211SJeremy Fitzhardinge 3800d160211SJeremy Fitzhardinge for (cons = np->tx.rsp_cons; cons != prod; cons++) { 3810d160211SJeremy Fitzhardinge struct xen_netif_tx_response *txrsp; 3820d160211SJeremy Fitzhardinge 3830d160211SJeremy Fitzhardinge txrsp = RING_GET_RESPONSE(&np->tx, cons); 384f942dc25SIan Campbell if (txrsp->status == XEN_NETIF_RSP_NULL) 3850d160211SJeremy Fitzhardinge continue; 3860d160211SJeremy Fitzhardinge 3870d160211SJeremy Fitzhardinge id = txrsp->id; 3880d160211SJeremy Fitzhardinge skb = np->tx_skbs[id].skb; 3890d160211SJeremy Fitzhardinge if (unlikely(gnttab_query_foreign_access( 3900d160211SJeremy Fitzhardinge np->grant_tx_ref[id]) != 0)) { 391383eda32SJoe Perches pr_alert("%s: warning -- grant still in use by backend domain\n", 392383eda32SJoe Perches __func__); 3930d160211SJeremy Fitzhardinge BUG(); 3940d160211SJeremy Fitzhardinge } 3950d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref( 3960d160211SJeremy Fitzhardinge np->grant_tx_ref[id], GNTMAP_readonly); 3970d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 3980d160211SJeremy Fitzhardinge &np->gref_tx_head, np->grant_tx_ref[id]); 3990d160211SJeremy Fitzhardinge np->grant_tx_ref[id] = GRANT_INVALID_REF; 400cefe0078SAnnie Li np->grant_tx_page[id] = NULL; 4010d160211SJeremy Fitzhardinge add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); 4020d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 4030d160211SJeremy Fitzhardinge } 4040d160211SJeremy Fitzhardinge 4050d160211SJeremy Fitzhardinge np->tx.rsp_cons = prod; 4060d160211SJeremy Fitzhardinge 4070d160211SJeremy Fitzhardinge /* 4080d160211SJeremy Fitzhardinge * Set a new event, then check for race with update of tx_cons. 4090d160211SJeremy Fitzhardinge * Note that it is essential to schedule a callback, no matter 4100d160211SJeremy Fitzhardinge * how few buffers are pending. Even if there is space in the 4110d160211SJeremy Fitzhardinge * transmit ring, higher layers may be blocked because too much 4120d160211SJeremy Fitzhardinge * data is outstanding: in such cases notification from Xen is 4130d160211SJeremy Fitzhardinge * likely to be the only kick that we'll get. 4140d160211SJeremy Fitzhardinge */ 4150d160211SJeremy Fitzhardinge np->tx.sring->rsp_event = 4160d160211SJeremy Fitzhardinge prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; 4170d160211SJeremy Fitzhardinge mb(); /* update shared area */ 4180d160211SJeremy Fitzhardinge } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); 4190d160211SJeremy Fitzhardinge 4200d160211SJeremy Fitzhardinge xennet_maybe_wake_tx(dev); 4210d160211SJeremy Fitzhardinge } 4220d160211SJeremy Fitzhardinge 4230d160211SJeremy Fitzhardinge static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, 4240d160211SJeremy Fitzhardinge struct xen_netif_tx_request *tx) 4250d160211SJeremy Fitzhardinge { 4260d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 4270d160211SJeremy Fitzhardinge char *data = skb->data; 4280d160211SJeremy Fitzhardinge unsigned long mfn; 4290d160211SJeremy Fitzhardinge RING_IDX prod = np->tx.req_prod_pvt; 4300d160211SJeremy Fitzhardinge int frags = skb_shinfo(skb)->nr_frags; 4310d160211SJeremy Fitzhardinge unsigned int offset = offset_in_page(data); 4320d160211SJeremy Fitzhardinge unsigned int len = skb_headlen(skb); 4330d160211SJeremy Fitzhardinge unsigned int id; 4340d160211SJeremy Fitzhardinge grant_ref_t ref; 4350d160211SJeremy Fitzhardinge int i; 4360d160211SJeremy Fitzhardinge 4370d160211SJeremy Fitzhardinge /* While the header overlaps a page boundary (including being 4380d160211SJeremy Fitzhardinge larger than a page), split it it into page-sized chunks. */ 4390d160211SJeremy Fitzhardinge while (len > PAGE_SIZE - offset) { 4400d160211SJeremy Fitzhardinge tx->size = PAGE_SIZE - offset; 441f942dc25SIan Campbell tx->flags |= XEN_NETTXF_more_data; 4420d160211SJeremy Fitzhardinge len -= tx->size; 4430d160211SJeremy Fitzhardinge data += tx->size; 4440d160211SJeremy Fitzhardinge offset = 0; 4450d160211SJeremy Fitzhardinge 4460d160211SJeremy Fitzhardinge id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); 4470d160211SJeremy Fitzhardinge np->tx_skbs[id].skb = skb_get(skb); 4480d160211SJeremy Fitzhardinge tx = RING_GET_REQUEST(&np->tx, prod++); 4490d160211SJeremy Fitzhardinge tx->id = id; 4500d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_tx_head); 4510d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 4520d160211SJeremy Fitzhardinge 4530d160211SJeremy Fitzhardinge mfn = virt_to_mfn(data); 4540d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, 4550d160211SJeremy Fitzhardinge mfn, GNTMAP_readonly); 4560d160211SJeremy Fitzhardinge 457cefe0078SAnnie Li np->grant_tx_page[id] = virt_to_page(data); 4580d160211SJeremy Fitzhardinge tx->gref = np->grant_tx_ref[id] = ref; 4590d160211SJeremy Fitzhardinge tx->offset = offset; 4600d160211SJeremy Fitzhardinge tx->size = len; 4610d160211SJeremy Fitzhardinge tx->flags = 0; 4620d160211SJeremy Fitzhardinge } 4630d160211SJeremy Fitzhardinge 4640d160211SJeremy Fitzhardinge /* Grant backend access to each skb fragment page. */ 4650d160211SJeremy Fitzhardinge for (i = 0; i < frags; i++) { 4660d160211SJeremy Fitzhardinge skb_frag_t *frag = skb_shinfo(skb)->frags + i; 467f36c3747SIan Campbell struct page *page = skb_frag_page(frag); 468f36c3747SIan Campbell 469f36c3747SIan Campbell len = skb_frag_size(frag); 470f36c3747SIan Campbell offset = frag->page_offset; 471f36c3747SIan Campbell 472f36c3747SIan Campbell /* Data must not cross a page boundary. */ 473f36c3747SIan Campbell BUG_ON(len + offset > PAGE_SIZE<<compound_order(page)); 474f36c3747SIan Campbell 475f36c3747SIan Campbell /* Skip unused frames from start of page */ 476f36c3747SIan Campbell page += offset >> PAGE_SHIFT; 477f36c3747SIan Campbell offset &= ~PAGE_MASK; 478f36c3747SIan Campbell 479f36c3747SIan Campbell while (len > 0) { 480f36c3747SIan Campbell unsigned long bytes; 481f36c3747SIan Campbell 482f36c3747SIan Campbell BUG_ON(offset >= PAGE_SIZE); 483f36c3747SIan Campbell 484f36c3747SIan Campbell bytes = PAGE_SIZE - offset; 485f36c3747SIan Campbell if (bytes > len) 486f36c3747SIan Campbell bytes = len; 4870d160211SJeremy Fitzhardinge 488f942dc25SIan Campbell tx->flags |= XEN_NETTXF_more_data; 4890d160211SJeremy Fitzhardinge 490f36c3747SIan Campbell id = get_id_from_freelist(&np->tx_skb_freelist, 491f36c3747SIan Campbell np->tx_skbs); 4920d160211SJeremy Fitzhardinge np->tx_skbs[id].skb = skb_get(skb); 4930d160211SJeremy Fitzhardinge tx = RING_GET_REQUEST(&np->tx, prod++); 4940d160211SJeremy Fitzhardinge tx->id = id; 4950d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_tx_head); 4960d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 4970d160211SJeremy Fitzhardinge 498f36c3747SIan Campbell mfn = pfn_to_mfn(page_to_pfn(page)); 499f36c3747SIan Campbell gnttab_grant_foreign_access_ref(ref, 500f36c3747SIan Campbell np->xbdev->otherend_id, 5010d160211SJeremy Fitzhardinge mfn, GNTMAP_readonly); 5020d160211SJeremy Fitzhardinge 503cefe0078SAnnie Li np->grant_tx_page[id] = page; 5040d160211SJeremy Fitzhardinge tx->gref = np->grant_tx_ref[id] = ref; 505f36c3747SIan Campbell tx->offset = offset; 506f36c3747SIan Campbell tx->size = bytes; 5070d160211SJeremy Fitzhardinge tx->flags = 0; 508f36c3747SIan Campbell 509f36c3747SIan Campbell offset += bytes; 510f36c3747SIan Campbell len -= bytes; 511f36c3747SIan Campbell 512f36c3747SIan Campbell /* Next frame */ 513f36c3747SIan Campbell if (offset == PAGE_SIZE && len) { 514f36c3747SIan Campbell BUG_ON(!PageCompound(page)); 515f36c3747SIan Campbell page++; 516f36c3747SIan Campbell offset = 0; 517f36c3747SIan Campbell } 518f36c3747SIan Campbell } 5190d160211SJeremy Fitzhardinge } 5200d160211SJeremy Fitzhardinge 5210d160211SJeremy Fitzhardinge np->tx.req_prod_pvt = prod; 5220d160211SJeremy Fitzhardinge } 5230d160211SJeremy Fitzhardinge 524f36c3747SIan Campbell /* 525f36c3747SIan Campbell * Count how many ring slots are required to send the frags of this 526f36c3747SIan Campbell * skb. Each frag might be a compound page. 527f36c3747SIan Campbell */ 528f36c3747SIan Campbell static int xennet_count_skb_frag_slots(struct sk_buff *skb) 529f36c3747SIan Campbell { 530f36c3747SIan Campbell int i, frags = skb_shinfo(skb)->nr_frags; 531f36c3747SIan Campbell int pages = 0; 532f36c3747SIan Campbell 533f36c3747SIan Campbell for (i = 0; i < frags; i++) { 534f36c3747SIan Campbell skb_frag_t *frag = skb_shinfo(skb)->frags + i; 535f36c3747SIan Campbell unsigned long size = skb_frag_size(frag); 536f36c3747SIan Campbell unsigned long offset = frag->page_offset; 537f36c3747SIan Campbell 538f36c3747SIan Campbell /* Skip unused frames from start of page */ 539f36c3747SIan Campbell offset &= ~PAGE_MASK; 540f36c3747SIan Campbell 541f36c3747SIan Campbell pages += PFN_UP(offset + size); 542f36c3747SIan Campbell } 543f36c3747SIan Campbell 544f36c3747SIan Campbell return pages; 545f36c3747SIan Campbell } 546f36c3747SIan Campbell 5470d160211SJeremy Fitzhardinge static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 5480d160211SJeremy Fitzhardinge { 5490d160211SJeremy Fitzhardinge unsigned short id; 5500d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 551e00f85beSstephen hemminger struct netfront_stats *stats = this_cpu_ptr(np->stats); 5520d160211SJeremy Fitzhardinge struct xen_netif_tx_request *tx; 5530d160211SJeremy Fitzhardinge char *data = skb->data; 5540d160211SJeremy Fitzhardinge RING_IDX i; 5550d160211SJeremy Fitzhardinge grant_ref_t ref; 5560d160211SJeremy Fitzhardinge unsigned long mfn; 5570d160211SJeremy Fitzhardinge int notify; 558f36c3747SIan Campbell int slots; 5590d160211SJeremy Fitzhardinge unsigned int offset = offset_in_page(data); 5600d160211SJeremy Fitzhardinge unsigned int len = skb_headlen(skb); 561cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 5620d160211SJeremy Fitzhardinge 5639ecd1a75SWei Liu /* If skb->len is too big for wire format, drop skb and alert 5649ecd1a75SWei Liu * user about misconfiguration. 5659ecd1a75SWei Liu */ 5669ecd1a75SWei Liu if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { 5679ecd1a75SWei Liu net_alert_ratelimited( 5689ecd1a75SWei Liu "xennet: skb->len = %u, too big for wire format\n", 5699ecd1a75SWei Liu skb->len); 5709ecd1a75SWei Liu goto drop; 5719ecd1a75SWei Liu } 5729ecd1a75SWei Liu 573f36c3747SIan Campbell slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) + 574f36c3747SIan Campbell xennet_count_skb_frag_slots(skb); 575f36c3747SIan Campbell if (unlikely(slots > MAX_SKB_FRAGS + 1)) { 576f36c3747SIan Campbell net_alert_ratelimited( 577f36c3747SIan Campbell "xennet: skb rides the rocket: %d slots\n", slots); 5780d160211SJeremy Fitzhardinge goto drop; 5790d160211SJeremy Fitzhardinge } 5800d160211SJeremy Fitzhardinge 581cf66f9d4SKonrad Rzeszutek Wilk spin_lock_irqsave(&np->tx_lock, flags); 5820d160211SJeremy Fitzhardinge 5830d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 584f36c3747SIan Campbell (slots > 1 && !xennet_can_sg(dev)) || 585fc741216SJesse Gross netif_needs_gso(skb, netif_skb_features(skb)))) { 586cf66f9d4SKonrad Rzeszutek Wilk spin_unlock_irqrestore(&np->tx_lock, flags); 5870d160211SJeremy Fitzhardinge goto drop; 5880d160211SJeremy Fitzhardinge } 5890d160211SJeremy Fitzhardinge 5900d160211SJeremy Fitzhardinge i = np->tx.req_prod_pvt; 5910d160211SJeremy Fitzhardinge 5920d160211SJeremy Fitzhardinge id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); 5930d160211SJeremy Fitzhardinge np->tx_skbs[id].skb = skb; 5940d160211SJeremy Fitzhardinge 5950d160211SJeremy Fitzhardinge tx = RING_GET_REQUEST(&np->tx, i); 5960d160211SJeremy Fitzhardinge 5970d160211SJeremy Fitzhardinge tx->id = id; 5980d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_tx_head); 5990d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 6000d160211SJeremy Fitzhardinge mfn = virt_to_mfn(data); 6010d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref( 6020d160211SJeremy Fitzhardinge ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); 603cefe0078SAnnie Li np->grant_tx_page[id] = virt_to_page(data); 6040d160211SJeremy Fitzhardinge tx->gref = np->grant_tx_ref[id] = ref; 6050d160211SJeremy Fitzhardinge tx->offset = offset; 6060d160211SJeremy Fitzhardinge tx->size = len; 6070d160211SJeremy Fitzhardinge 6080d160211SJeremy Fitzhardinge tx->flags = 0; 6090d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 6100d160211SJeremy Fitzhardinge /* local packet? */ 611f942dc25SIan Campbell tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; 6120d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 6130d160211SJeremy Fitzhardinge /* remote but checksummed. */ 614f942dc25SIan Campbell tx->flags |= XEN_NETTXF_data_validated; 6150d160211SJeremy Fitzhardinge 6160d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 6170d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 6180d160211SJeremy Fitzhardinge 6190d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 6200d160211SJeremy Fitzhardinge RING_GET_REQUEST(&np->tx, ++i); 6210d160211SJeremy Fitzhardinge 622f942dc25SIan Campbell tx->flags |= XEN_NETTXF_extra_info; 6230d160211SJeremy Fitzhardinge 6240d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 6252c0057deSPaul Durrant gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? 6262c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV6 : 6272c0057deSPaul Durrant XEN_NETIF_GSO_TYPE_TCPV4; 6280d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 6290d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 6300d160211SJeremy Fitzhardinge 6310d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 6320d160211SJeremy Fitzhardinge gso->flags = 0; 6330d160211SJeremy Fitzhardinge } 6340d160211SJeremy Fitzhardinge 6350d160211SJeremy Fitzhardinge np->tx.req_prod_pvt = i + 1; 6360d160211SJeremy Fitzhardinge 6370d160211SJeremy Fitzhardinge xennet_make_frags(skb, dev, tx); 6380d160211SJeremy Fitzhardinge tx->size = skb->len; 6390d160211SJeremy Fitzhardinge 6400d160211SJeremy Fitzhardinge RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); 6410d160211SJeremy Fitzhardinge if (notify) 642d634bf2cSWei Liu notify_remote_via_irq(np->tx_irq); 6430d160211SJeremy Fitzhardinge 644e00f85beSstephen hemminger u64_stats_update_begin(&stats->syncp); 645e00f85beSstephen hemminger stats->tx_bytes += skb->len; 646e00f85beSstephen hemminger stats->tx_packets++; 647e00f85beSstephen hemminger u64_stats_update_end(&stats->syncp); 64810a273a6SJeremy Fitzhardinge 64910a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 6500d160211SJeremy Fitzhardinge xennet_tx_buf_gc(dev); 6510d160211SJeremy Fitzhardinge 6520d160211SJeremy Fitzhardinge if (!netfront_tx_slot_available(np)) 6530d160211SJeremy Fitzhardinge netif_stop_queue(dev); 6540d160211SJeremy Fitzhardinge 655cf66f9d4SKonrad Rzeszutek Wilk spin_unlock_irqrestore(&np->tx_lock, flags); 6560d160211SJeremy Fitzhardinge 6576ed10654SPatrick McHardy return NETDEV_TX_OK; 6580d160211SJeremy Fitzhardinge 6590d160211SJeremy Fitzhardinge drop: 66009f75cd7SJeff Garzik dev->stats.tx_dropped++; 6610d160211SJeremy Fitzhardinge dev_kfree_skb(skb); 6626ed10654SPatrick McHardy return NETDEV_TX_OK; 6630d160211SJeremy Fitzhardinge } 6640d160211SJeremy Fitzhardinge 6650d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 6660d160211SJeremy Fitzhardinge { 6670d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 6680d160211SJeremy Fitzhardinge netif_stop_queue(np->netdev); 669bea3348eSStephen Hemminger napi_disable(&np->napi); 6700d160211SJeremy Fitzhardinge return 0; 6710d160211SJeremy Fitzhardinge } 6720d160211SJeremy Fitzhardinge 6730d160211SJeremy Fitzhardinge static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, 6740d160211SJeremy Fitzhardinge grant_ref_t ref) 6750d160211SJeremy Fitzhardinge { 6760d160211SJeremy Fitzhardinge int new = xennet_rxidx(np->rx.req_prod_pvt); 6770d160211SJeremy Fitzhardinge 6780d160211SJeremy Fitzhardinge BUG_ON(np->rx_skbs[new]); 6790d160211SJeremy Fitzhardinge np->rx_skbs[new] = skb; 6800d160211SJeremy Fitzhardinge np->grant_rx_ref[new] = ref; 6810d160211SJeremy Fitzhardinge RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; 6820d160211SJeremy Fitzhardinge RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; 6830d160211SJeremy Fitzhardinge np->rx.req_prod_pvt++; 6840d160211SJeremy Fitzhardinge } 6850d160211SJeremy Fitzhardinge 6860d160211SJeremy Fitzhardinge static int xennet_get_extras(struct netfront_info *np, 6870d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 6880d160211SJeremy Fitzhardinge RING_IDX rp) 6890d160211SJeremy Fitzhardinge 6900d160211SJeremy Fitzhardinge { 6910d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 6920d160211SJeremy Fitzhardinge struct device *dev = &np->netdev->dev; 6930d160211SJeremy Fitzhardinge RING_IDX cons = np->rx.rsp_cons; 6940d160211SJeremy Fitzhardinge int err = 0; 6950d160211SJeremy Fitzhardinge 6960d160211SJeremy Fitzhardinge do { 6970d160211SJeremy Fitzhardinge struct sk_buff *skb; 6980d160211SJeremy Fitzhardinge grant_ref_t ref; 6990d160211SJeremy Fitzhardinge 7000d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 7010d160211SJeremy Fitzhardinge if (net_ratelimit()) 7020d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 7030d160211SJeremy Fitzhardinge err = -EBADR; 7040d160211SJeremy Fitzhardinge break; 7050d160211SJeremy Fitzhardinge } 7060d160211SJeremy Fitzhardinge 7070d160211SJeremy Fitzhardinge extra = (struct xen_netif_extra_info *) 7080d160211SJeremy Fitzhardinge RING_GET_RESPONSE(&np->rx, ++cons); 7090d160211SJeremy Fitzhardinge 7100d160211SJeremy Fitzhardinge if (unlikely(!extra->type || 7110d160211SJeremy Fitzhardinge extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 7120d160211SJeremy Fitzhardinge if (net_ratelimit()) 7130d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 7140d160211SJeremy Fitzhardinge extra->type); 7150d160211SJeremy Fitzhardinge err = -EINVAL; 7160d160211SJeremy Fitzhardinge } else { 7170d160211SJeremy Fitzhardinge memcpy(&extras[extra->type - 1], extra, 7180d160211SJeremy Fitzhardinge sizeof(*extra)); 7190d160211SJeremy Fitzhardinge } 7200d160211SJeremy Fitzhardinge 7210d160211SJeremy Fitzhardinge skb = xennet_get_rx_skb(np, cons); 7220d160211SJeremy Fitzhardinge ref = xennet_get_rx_ref(np, cons); 7230d160211SJeremy Fitzhardinge xennet_move_rx_slot(np, skb, ref); 7240d160211SJeremy Fitzhardinge } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 7250d160211SJeremy Fitzhardinge 7260d160211SJeremy Fitzhardinge np->rx.rsp_cons = cons; 7270d160211SJeremy Fitzhardinge return err; 7280d160211SJeremy Fitzhardinge } 7290d160211SJeremy Fitzhardinge 7300d160211SJeremy Fitzhardinge static int xennet_get_responses(struct netfront_info *np, 7310d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 7320d160211SJeremy Fitzhardinge struct sk_buff_head *list) 7330d160211SJeremy Fitzhardinge { 7340d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo->rx; 7350d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo->extras; 7360d160211SJeremy Fitzhardinge struct device *dev = &np->netdev->dev; 7370d160211SJeremy Fitzhardinge RING_IDX cons = np->rx.rsp_cons; 7380d160211SJeremy Fitzhardinge struct sk_buff *skb = xennet_get_rx_skb(np, cons); 7390d160211SJeremy Fitzhardinge grant_ref_t ref = xennet_get_rx_ref(np, cons); 7400d160211SJeremy Fitzhardinge int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); 7417158ff6dSWei Liu int slots = 1; 7420d160211SJeremy Fitzhardinge int err = 0; 7430d160211SJeremy Fitzhardinge unsigned long ret; 7440d160211SJeremy Fitzhardinge 745f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_extra_info) { 7460d160211SJeremy Fitzhardinge err = xennet_get_extras(np, extras, rp); 7470d160211SJeremy Fitzhardinge cons = np->rx.rsp_cons; 7480d160211SJeremy Fitzhardinge } 7490d160211SJeremy Fitzhardinge 7500d160211SJeremy Fitzhardinge for (;;) { 7510d160211SJeremy Fitzhardinge if (unlikely(rx->status < 0 || 7520d160211SJeremy Fitzhardinge rx->offset + rx->status > PAGE_SIZE)) { 7530d160211SJeremy Fitzhardinge if (net_ratelimit()) 7540d160211SJeremy Fitzhardinge dev_warn(dev, "rx->offset: %x, size: %u\n", 7550d160211SJeremy Fitzhardinge rx->offset, rx->status); 7560d160211SJeremy Fitzhardinge xennet_move_rx_slot(np, skb, ref); 7570d160211SJeremy Fitzhardinge err = -EINVAL; 7580d160211SJeremy Fitzhardinge goto next; 7590d160211SJeremy Fitzhardinge } 7600d160211SJeremy Fitzhardinge 7610d160211SJeremy Fitzhardinge /* 7620d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 7630d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 764697089dcSWei Liu * situation to the system controller to reboot the backend. 7650d160211SJeremy Fitzhardinge */ 7660d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 7670d160211SJeremy Fitzhardinge if (net_ratelimit()) 7680d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 7690d160211SJeremy Fitzhardinge rx->id); 7700d160211SJeremy Fitzhardinge err = -EINVAL; 7710d160211SJeremy Fitzhardinge goto next; 7720d160211SJeremy Fitzhardinge } 7730d160211SJeremy Fitzhardinge 7740d160211SJeremy Fitzhardinge ret = gnttab_end_foreign_access_ref(ref, 0); 7750d160211SJeremy Fitzhardinge BUG_ON(!ret); 7760d160211SJeremy Fitzhardinge 7770d160211SJeremy Fitzhardinge gnttab_release_grant_reference(&np->gref_rx_head, ref); 7780d160211SJeremy Fitzhardinge 7790d160211SJeremy Fitzhardinge __skb_queue_tail(list, skb); 7800d160211SJeremy Fitzhardinge 7810d160211SJeremy Fitzhardinge next: 782f942dc25SIan Campbell if (!(rx->flags & XEN_NETRXF_more_data)) 7830d160211SJeremy Fitzhardinge break; 7840d160211SJeremy Fitzhardinge 7857158ff6dSWei Liu if (cons + slots == rp) { 7860d160211SJeremy Fitzhardinge if (net_ratelimit()) 7877158ff6dSWei Liu dev_warn(dev, "Need more slots\n"); 7880d160211SJeremy Fitzhardinge err = -ENOENT; 7890d160211SJeremy Fitzhardinge break; 7900d160211SJeremy Fitzhardinge } 7910d160211SJeremy Fitzhardinge 7927158ff6dSWei Liu rx = RING_GET_RESPONSE(&np->rx, cons + slots); 7937158ff6dSWei Liu skb = xennet_get_rx_skb(np, cons + slots); 7947158ff6dSWei Liu ref = xennet_get_rx_ref(np, cons + slots); 7957158ff6dSWei Liu slots++; 7960d160211SJeremy Fitzhardinge } 7970d160211SJeremy Fitzhardinge 7987158ff6dSWei Liu if (unlikely(slots > max)) { 7990d160211SJeremy Fitzhardinge if (net_ratelimit()) 800697089dcSWei Liu dev_warn(dev, "Too many slots\n"); 8010d160211SJeremy Fitzhardinge err = -E2BIG; 8020d160211SJeremy Fitzhardinge } 8030d160211SJeremy Fitzhardinge 8040d160211SJeremy Fitzhardinge if (unlikely(err)) 8057158ff6dSWei Liu np->rx.rsp_cons = cons + slots; 8060d160211SJeremy Fitzhardinge 8070d160211SJeremy Fitzhardinge return err; 8080d160211SJeremy Fitzhardinge } 8090d160211SJeremy Fitzhardinge 8100d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 8110d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 8120d160211SJeremy Fitzhardinge { 8130d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 8140d160211SJeremy Fitzhardinge if (net_ratelimit()) 815383eda32SJoe Perches pr_warn("GSO size must not be zero\n"); 8160d160211SJeremy Fitzhardinge return -EINVAL; 8170d160211SJeremy Fitzhardinge } 8180d160211SJeremy Fitzhardinge 8192c0057deSPaul Durrant if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && 8202c0057deSPaul Durrant gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { 8210d160211SJeremy Fitzhardinge if (net_ratelimit()) 822383eda32SJoe Perches pr_warn("Bad GSO type %d\n", gso->u.gso.type); 8230d160211SJeremy Fitzhardinge return -EINVAL; 8240d160211SJeremy Fitzhardinge } 8250d160211SJeremy Fitzhardinge 8260d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 8272c0057deSPaul Durrant skb_shinfo(skb)->gso_type = 8282c0057deSPaul Durrant (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? 8292c0057deSPaul Durrant SKB_GSO_TCPV4 : 8302c0057deSPaul Durrant SKB_GSO_TCPV6; 8310d160211SJeremy Fitzhardinge 8320d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 8330d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 8340d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 8350d160211SJeremy Fitzhardinge 8360d160211SJeremy Fitzhardinge return 0; 8370d160211SJeremy Fitzhardinge } 8380d160211SJeremy Fitzhardinge 8390d160211SJeremy Fitzhardinge static RING_IDX xennet_fill_frags(struct netfront_info *np, 8400d160211SJeremy Fitzhardinge struct sk_buff *skb, 8410d160211SJeremy Fitzhardinge struct sk_buff_head *list) 8420d160211SJeremy Fitzhardinge { 8430d160211SJeremy Fitzhardinge struct skb_shared_info *shinfo = skb_shinfo(skb); 8440d160211SJeremy Fitzhardinge RING_IDX cons = np->rx.rsp_cons; 8450d160211SJeremy Fitzhardinge struct sk_buff *nskb; 8460d160211SJeremy Fitzhardinge 8470d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 8480d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = 8490d160211SJeremy Fitzhardinge RING_GET_RESPONSE(&np->rx, ++cons); 85001c68026SIan Campbell skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; 8510d160211SJeremy Fitzhardinge 852093b9c71SJan Beulich if (shinfo->nr_frags == MAX_SKB_FRAGS) { 853093b9c71SJan Beulich unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 8540d160211SJeremy Fitzhardinge 855093b9c71SJan Beulich BUG_ON(pull_to <= skb_headlen(skb)); 856093b9c71SJan Beulich __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 857093b9c71SJan Beulich } 858093b9c71SJan Beulich BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); 859093b9c71SJan Beulich 860093b9c71SJan Beulich skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), 861093b9c71SJan Beulich rx->offset, rx->status, PAGE_SIZE); 8620d160211SJeremy Fitzhardinge 8630d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 8640d160211SJeremy Fitzhardinge kfree_skb(nskb); 8650d160211SJeremy Fitzhardinge } 8660d160211SJeremy Fitzhardinge 8670d160211SJeremy Fitzhardinge return cons; 8680d160211SJeremy Fitzhardinge } 8690d160211SJeremy Fitzhardinge 870e0ce4af9SIan Campbell static int checksum_setup(struct net_device *dev, struct sk_buff *skb) 8710d160211SJeremy Fitzhardinge { 872b5cf66cdSPaul Durrant bool recalculate_partial_csum = false; 873e0ce4af9SIan Campbell 874e0ce4af9SIan Campbell /* 875e0ce4af9SIan Campbell * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy 876e0ce4af9SIan Campbell * peers can fail to set NETRXF_csum_blank when sending a GSO 877e0ce4af9SIan Campbell * frame. In this case force the SKB to CHECKSUM_PARTIAL and 878e0ce4af9SIan Campbell * recalculate the partial checksum. 879e0ce4af9SIan Campbell */ 880e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { 881e0ce4af9SIan Campbell struct netfront_info *np = netdev_priv(dev); 882e0ce4af9SIan Campbell np->rx_gso_checksum_fixup++; 883e0ce4af9SIan Campbell skb->ip_summed = CHECKSUM_PARTIAL; 884b5cf66cdSPaul Durrant recalculate_partial_csum = true; 885e0ce4af9SIan Campbell } 886e0ce4af9SIan Campbell 887e0ce4af9SIan Campbell /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ 888e0ce4af9SIan Campbell if (skb->ip_summed != CHECKSUM_PARTIAL) 889e0ce4af9SIan Campbell return 0; 8900d160211SJeremy Fitzhardinge 891b5cf66cdSPaul Durrant return skb_checksum_setup(skb, recalculate_partial_csum); 8920d160211SJeremy Fitzhardinge } 8930d160211SJeremy Fitzhardinge 8940d160211SJeremy Fitzhardinge static int handle_incoming_queue(struct net_device *dev, 8950d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 8960d160211SJeremy Fitzhardinge { 897e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 898e00f85beSstephen hemminger struct netfront_stats *stats = this_cpu_ptr(np->stats); 8990d160211SJeremy Fitzhardinge int packets_dropped = 0; 9000d160211SJeremy Fitzhardinge struct sk_buff *skb; 9010d160211SJeremy Fitzhardinge 9020d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 9033683243bSIan Campbell int pull_to = NETFRONT_SKB_CB(skb)->pull_to; 9040d160211SJeremy Fitzhardinge 905093b9c71SJan Beulich if (pull_to > skb_headlen(skb)) 9063683243bSIan Campbell __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); 9070d160211SJeremy Fitzhardinge 9080d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 9090d160211SJeremy Fitzhardinge skb->protocol = eth_type_trans(skb, dev); 9100d160211SJeremy Fitzhardinge 911e0ce4af9SIan Campbell if (checksum_setup(dev, skb)) { 9120d160211SJeremy Fitzhardinge kfree_skb(skb); 9130d160211SJeremy Fitzhardinge packets_dropped++; 91409f75cd7SJeff Garzik dev->stats.rx_errors++; 9150d160211SJeremy Fitzhardinge continue; 9160d160211SJeremy Fitzhardinge } 9170d160211SJeremy Fitzhardinge 918e00f85beSstephen hemminger u64_stats_update_begin(&stats->syncp); 919e00f85beSstephen hemminger stats->rx_packets++; 920e00f85beSstephen hemminger stats->rx_bytes += skb->len; 921e00f85beSstephen hemminger u64_stats_update_end(&stats->syncp); 9220d160211SJeremy Fitzhardinge 9230d160211SJeremy Fitzhardinge /* Pass it up. */ 92499d3d587SWei Liu napi_gro_receive(&np->napi, skb); 9250d160211SJeremy Fitzhardinge } 9260d160211SJeremy Fitzhardinge 9270d160211SJeremy Fitzhardinge return packets_dropped; 9280d160211SJeremy Fitzhardinge } 9290d160211SJeremy Fitzhardinge 930bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 9310d160211SJeremy Fitzhardinge { 932bea3348eSStephen Hemminger struct netfront_info *np = container_of(napi, struct netfront_info, napi); 933bea3348eSStephen Hemminger struct net_device *dev = np->netdev; 9340d160211SJeremy Fitzhardinge struct sk_buff *skb; 9350d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 9360d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 9370d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 9380d160211SJeremy Fitzhardinge RING_IDX i, rp; 939bea3348eSStephen Hemminger int work_done; 9400d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 9410d160211SJeremy Fitzhardinge struct sk_buff_head errq; 9420d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 9430d160211SJeremy Fitzhardinge unsigned long flags; 9440d160211SJeremy Fitzhardinge int err; 9450d160211SJeremy Fitzhardinge 9460d160211SJeremy Fitzhardinge spin_lock(&np->rx_lock); 9470d160211SJeremy Fitzhardinge 9480d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 9490d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 9500d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 9510d160211SJeremy Fitzhardinge 9520d160211SJeremy Fitzhardinge rp = np->rx.sring->rsp_prod; 9530d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 9540d160211SJeremy Fitzhardinge 9550d160211SJeremy Fitzhardinge i = np->rx.rsp_cons; 9560d160211SJeremy Fitzhardinge work_done = 0; 9570d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 9580d160211SJeremy Fitzhardinge memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); 9590d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 9600d160211SJeremy Fitzhardinge 9610d160211SJeremy Fitzhardinge err = xennet_get_responses(np, &rinfo, rp, &tmpq); 9620d160211SJeremy Fitzhardinge 9630d160211SJeremy Fitzhardinge if (unlikely(err)) { 9640d160211SJeremy Fitzhardinge err: 9650d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 9660d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 96709f75cd7SJeff Garzik dev->stats.rx_errors++; 9680d160211SJeremy Fitzhardinge i = np->rx.rsp_cons; 9690d160211SJeremy Fitzhardinge continue; 9700d160211SJeremy Fitzhardinge } 9710d160211SJeremy Fitzhardinge 9720d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 9730d160211SJeremy Fitzhardinge 9740d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 9750d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 9760d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 9770d160211SJeremy Fitzhardinge 9780d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 9790d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 9800d160211SJeremy Fitzhardinge np->rx.rsp_cons += skb_queue_len(&tmpq); 9810d160211SJeremy Fitzhardinge goto err; 9820d160211SJeremy Fitzhardinge } 9830d160211SJeremy Fitzhardinge } 9840d160211SJeremy Fitzhardinge 9853683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = rx->status; 9863683243bSIan Campbell if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) 9873683243bSIan Campbell NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; 9880d160211SJeremy Fitzhardinge 9893683243bSIan Campbell skb_shinfo(skb)->frags[0].page_offset = rx->offset; 9903683243bSIan Campbell skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); 9913683243bSIan Campbell skb->data_len = rx->status; 992093b9c71SJan Beulich skb->len += rx->status; 9930d160211SJeremy Fitzhardinge 9940d160211SJeremy Fitzhardinge i = xennet_fill_frags(np, skb, &tmpq); 9950d160211SJeremy Fitzhardinge 996f942dc25SIan Campbell if (rx->flags & XEN_NETRXF_csum_blank) 9970d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 998f942dc25SIan Campbell else if (rx->flags & XEN_NETRXF_data_validated) 9990d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 10000d160211SJeremy Fitzhardinge 10010d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 10020d160211SJeremy Fitzhardinge 10030d160211SJeremy Fitzhardinge np->rx.rsp_cons = ++i; 10040d160211SJeremy Fitzhardinge work_done++; 10050d160211SJeremy Fitzhardinge } 10060d160211SJeremy Fitzhardinge 100756cfe5d0SWang Chen __skb_queue_purge(&errq); 10080d160211SJeremy Fitzhardinge 10090d160211SJeremy Fitzhardinge work_done -= handle_incoming_queue(dev, &rxq); 10100d160211SJeremy Fitzhardinge 10110d160211SJeremy Fitzhardinge /* If we get a callback with very few responses, reduce fill target. */ 10120d160211SJeremy Fitzhardinge /* NB. Note exponential increase, linear decrease. */ 10130d160211SJeremy Fitzhardinge if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > 10140d160211SJeremy Fitzhardinge ((3*np->rx_target) / 4)) && 10150d160211SJeremy Fitzhardinge (--np->rx_target < np->rx_min_target)) 10160d160211SJeremy Fitzhardinge np->rx_target = np->rx_min_target; 10170d160211SJeremy Fitzhardinge 10180d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(dev); 10190d160211SJeremy Fitzhardinge 10200d160211SJeremy Fitzhardinge if (work_done < budget) { 1021bea3348eSStephen Hemminger int more_to_do = 0; 1022bea3348eSStephen Hemminger 102399d3d587SWei Liu napi_gro_flush(napi, false); 102499d3d587SWei Liu 10250d160211SJeremy Fitzhardinge local_irq_save(flags); 10260d160211SJeremy Fitzhardinge 10270d160211SJeremy Fitzhardinge RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); 10280d160211SJeremy Fitzhardinge if (!more_to_do) 1029288379f0SBen Hutchings __napi_complete(napi); 10300d160211SJeremy Fitzhardinge 10310d160211SJeremy Fitzhardinge local_irq_restore(flags); 10320d160211SJeremy Fitzhardinge } 10330d160211SJeremy Fitzhardinge 10340d160211SJeremy Fitzhardinge spin_unlock(&np->rx_lock); 10350d160211SJeremy Fitzhardinge 1036bea3348eSStephen Hemminger return work_done; 10370d160211SJeremy Fitzhardinge } 10380d160211SJeremy Fitzhardinge 10390d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 10400d160211SJeremy Fitzhardinge { 10419ecd1a75SWei Liu int max = xennet_can_sg(dev) ? 10429ecd1a75SWei Liu XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN; 10430d160211SJeremy Fitzhardinge 10440d160211SJeremy Fitzhardinge if (mtu > max) 10450d160211SJeremy Fitzhardinge return -EINVAL; 10460d160211SJeremy Fitzhardinge dev->mtu = mtu; 10470d160211SJeremy Fitzhardinge return 0; 10480d160211SJeremy Fitzhardinge } 10490d160211SJeremy Fitzhardinge 1050e00f85beSstephen hemminger static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, 1051e00f85beSstephen hemminger struct rtnl_link_stats64 *tot) 1052e00f85beSstephen hemminger { 1053e00f85beSstephen hemminger struct netfront_info *np = netdev_priv(dev); 1054e00f85beSstephen hemminger int cpu; 1055e00f85beSstephen hemminger 1056e00f85beSstephen hemminger for_each_possible_cpu(cpu) { 1057e00f85beSstephen hemminger struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); 1058e00f85beSstephen hemminger u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 1059e00f85beSstephen hemminger unsigned int start; 1060e00f85beSstephen hemminger 1061e00f85beSstephen hemminger do { 1062e00f85beSstephen hemminger start = u64_stats_fetch_begin_bh(&stats->syncp); 1063e00f85beSstephen hemminger 1064e00f85beSstephen hemminger rx_packets = stats->rx_packets; 1065e00f85beSstephen hemminger tx_packets = stats->tx_packets; 1066e00f85beSstephen hemminger rx_bytes = stats->rx_bytes; 1067e00f85beSstephen hemminger tx_bytes = stats->tx_bytes; 1068e00f85beSstephen hemminger } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); 1069e00f85beSstephen hemminger 1070e00f85beSstephen hemminger tot->rx_packets += rx_packets; 1071e00f85beSstephen hemminger tot->tx_packets += tx_packets; 1072e00f85beSstephen hemminger tot->rx_bytes += rx_bytes; 1073e00f85beSstephen hemminger tot->tx_bytes += tx_bytes; 1074e00f85beSstephen hemminger } 1075e00f85beSstephen hemminger 1076e00f85beSstephen hemminger tot->rx_errors = dev->stats.rx_errors; 1077e00f85beSstephen hemminger tot->tx_dropped = dev->stats.tx_dropped; 1078e00f85beSstephen hemminger 1079e00f85beSstephen hemminger return tot; 1080e00f85beSstephen hemminger } 1081e00f85beSstephen hemminger 10820d160211SJeremy Fitzhardinge static void xennet_release_tx_bufs(struct netfront_info *np) 10830d160211SJeremy Fitzhardinge { 10840d160211SJeremy Fitzhardinge struct sk_buff *skb; 10850d160211SJeremy Fitzhardinge int i; 10860d160211SJeremy Fitzhardinge 10870d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 10880d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 10891ffb40b8SIsaku Yamahata if (skb_entry_is_link(&np->tx_skbs[i])) 10900d160211SJeremy Fitzhardinge continue; 10910d160211SJeremy Fitzhardinge 10920d160211SJeremy Fitzhardinge skb = np->tx_skbs[i].skb; 1093cefe0078SAnnie Li get_page(np->grant_tx_page[i]); 1094cefe0078SAnnie Li gnttab_end_foreign_access(np->grant_tx_ref[i], 1095cefe0078SAnnie Li GNTMAP_readonly, 1096cefe0078SAnnie Li (unsigned long)page_address(np->grant_tx_page[i])); 1097cefe0078SAnnie Li np->grant_tx_page[i] = NULL; 10980d160211SJeremy Fitzhardinge np->grant_tx_ref[i] = GRANT_INVALID_REF; 10990d160211SJeremy Fitzhardinge add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); 11000d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 11010d160211SJeremy Fitzhardinge } 11020d160211SJeremy Fitzhardinge } 11030d160211SJeremy Fitzhardinge 11040d160211SJeremy Fitzhardinge static void xennet_release_rx_bufs(struct netfront_info *np) 11050d160211SJeremy Fitzhardinge { 11060d160211SJeremy Fitzhardinge int id, ref; 11070d160211SJeremy Fitzhardinge 11080d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 11090d160211SJeremy Fitzhardinge 11100d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 1111cefe0078SAnnie Li struct sk_buff *skb; 1112cefe0078SAnnie Li struct page *page; 11130d160211SJeremy Fitzhardinge 11140d160211SJeremy Fitzhardinge skb = np->rx_skbs[id]; 1115cefe0078SAnnie Li if (!skb) 1116cefe0078SAnnie Li continue; 1117cefe0078SAnnie Li 1118cefe0078SAnnie Li ref = np->grant_rx_ref[id]; 1119cefe0078SAnnie Li if (ref == GRANT_INVALID_REF) 1120cefe0078SAnnie Li continue; 1121cefe0078SAnnie Li 1122cefe0078SAnnie Li page = skb_frag_page(&skb_shinfo(skb)->frags[0]); 1123cefe0078SAnnie Li 1124cefe0078SAnnie Li /* gnttab_end_foreign_access() needs a page ref until 1125cefe0078SAnnie Li * foreign access is ended (which may be deferred). 1126cefe0078SAnnie Li */ 1127cefe0078SAnnie Li get_page(page); 1128cefe0078SAnnie Li gnttab_end_foreign_access(ref, 0, 1129cefe0078SAnnie Li (unsigned long)page_address(page)); 11300d160211SJeremy Fitzhardinge np->grant_rx_ref[id] = GRANT_INVALID_REF; 11310d160211SJeremy Fitzhardinge 1132cefe0078SAnnie Li kfree_skb(skb); 11330d160211SJeremy Fitzhardinge } 11340d160211SJeremy Fitzhardinge 11350d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 11360d160211SJeremy Fitzhardinge } 11370d160211SJeremy Fitzhardinge 11380d160211SJeremy Fitzhardinge static void xennet_uninit(struct net_device *dev) 11390d160211SJeremy Fitzhardinge { 11400d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 11410d160211SJeremy Fitzhardinge xennet_release_tx_bufs(np); 11420d160211SJeremy Fitzhardinge xennet_release_rx_bufs(np); 11430d160211SJeremy Fitzhardinge gnttab_free_grant_references(np->gref_tx_head); 11440d160211SJeremy Fitzhardinge gnttab_free_grant_references(np->gref_rx_head); 11450d160211SJeremy Fitzhardinge } 11460d160211SJeremy Fitzhardinge 1147c8f44affSMichał Mirosław static netdev_features_t xennet_fix_features(struct net_device *dev, 1148c8f44affSMichał Mirosław netdev_features_t features) 11498f7b01a1SEric Dumazet { 11508f7b01a1SEric Dumazet struct netfront_info *np = netdev_priv(dev); 11518f7b01a1SEric Dumazet int val; 11528f7b01a1SEric Dumazet 11538f7b01a1SEric Dumazet if (features & NETIF_F_SG) { 11548f7b01a1SEric Dumazet if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", 11558f7b01a1SEric Dumazet "%d", &val) < 0) 11568f7b01a1SEric Dumazet val = 0; 11578f7b01a1SEric Dumazet 11588f7b01a1SEric Dumazet if (!val) 11598f7b01a1SEric Dumazet features &= ~NETIF_F_SG; 11608f7b01a1SEric Dumazet } 11618f7b01a1SEric Dumazet 11622c0057deSPaul Durrant if (features & NETIF_F_IPV6_CSUM) { 11632c0057deSPaul Durrant if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 11642c0057deSPaul Durrant "feature-ipv6-csum-offload", "%d", &val) < 0) 11652c0057deSPaul Durrant val = 0; 11662c0057deSPaul Durrant 11672c0057deSPaul Durrant if (!val) 11682c0057deSPaul Durrant features &= ~NETIF_F_IPV6_CSUM; 11692c0057deSPaul Durrant } 11702c0057deSPaul Durrant 11718f7b01a1SEric Dumazet if (features & NETIF_F_TSO) { 11728f7b01a1SEric Dumazet if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 11738f7b01a1SEric Dumazet "feature-gso-tcpv4", "%d", &val) < 0) 11748f7b01a1SEric Dumazet val = 0; 11758f7b01a1SEric Dumazet 11768f7b01a1SEric Dumazet if (!val) 11778f7b01a1SEric Dumazet features &= ~NETIF_F_TSO; 11788f7b01a1SEric Dumazet } 11798f7b01a1SEric Dumazet 11802c0057deSPaul Durrant if (features & NETIF_F_TSO6) { 11812c0057deSPaul Durrant if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 11822c0057deSPaul Durrant "feature-gso-tcpv6", "%d", &val) < 0) 11832c0057deSPaul Durrant val = 0; 11842c0057deSPaul Durrant 11852c0057deSPaul Durrant if (!val) 11862c0057deSPaul Durrant features &= ~NETIF_F_TSO6; 11872c0057deSPaul Durrant } 11882c0057deSPaul Durrant 11898f7b01a1SEric Dumazet return features; 11908f7b01a1SEric Dumazet } 11918f7b01a1SEric Dumazet 1192c8f44affSMichał Mirosław static int xennet_set_features(struct net_device *dev, 1193c8f44affSMichał Mirosław netdev_features_t features) 11948f7b01a1SEric Dumazet { 11958f7b01a1SEric Dumazet if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { 11968f7b01a1SEric Dumazet netdev_info(dev, "Reducing MTU because no SG offload"); 11978f7b01a1SEric Dumazet dev->mtu = ETH_DATA_LEN; 11988f7b01a1SEric Dumazet } 11998f7b01a1SEric Dumazet 12008f7b01a1SEric Dumazet return 0; 12018f7b01a1SEric Dumazet } 12028f7b01a1SEric Dumazet 1203d634bf2cSWei Liu static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) 1204cf66f9d4SKonrad Rzeszutek Wilk { 1205d634bf2cSWei Liu struct netfront_info *np = dev_id; 1206d634bf2cSWei Liu struct net_device *dev = np->netdev; 1207cf66f9d4SKonrad Rzeszutek Wilk unsigned long flags; 1208cf66f9d4SKonrad Rzeszutek Wilk 1209cf66f9d4SKonrad Rzeszutek Wilk spin_lock_irqsave(&np->tx_lock, flags); 1210cf66f9d4SKonrad Rzeszutek Wilk xennet_tx_buf_gc(dev); 1211cf66f9d4SKonrad Rzeszutek Wilk spin_unlock_irqrestore(&np->tx_lock, flags); 1212cf66f9d4SKonrad Rzeszutek Wilk 1213cf66f9d4SKonrad Rzeszutek Wilk return IRQ_HANDLED; 1214cf66f9d4SKonrad Rzeszutek Wilk } 1215cf66f9d4SKonrad Rzeszutek Wilk 1216d634bf2cSWei Liu static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) 1217d634bf2cSWei Liu { 1218d634bf2cSWei Liu struct netfront_info *np = dev_id; 1219d634bf2cSWei Liu struct net_device *dev = np->netdev; 1220d634bf2cSWei Liu 1221d634bf2cSWei Liu if (likely(netif_carrier_ok(dev) && 1222d634bf2cSWei Liu RING_HAS_UNCONSUMED_RESPONSES(&np->rx))) 1223d634bf2cSWei Liu napi_schedule(&np->napi); 1224d634bf2cSWei Liu 1225d634bf2cSWei Liu return IRQ_HANDLED; 1226d634bf2cSWei Liu } 1227d634bf2cSWei Liu 1228d634bf2cSWei Liu static irqreturn_t xennet_interrupt(int irq, void *dev_id) 1229d634bf2cSWei Liu { 1230d634bf2cSWei Liu xennet_tx_interrupt(irq, dev_id); 1231d634bf2cSWei Liu xennet_rx_interrupt(irq, dev_id); 1232d634bf2cSWei Liu return IRQ_HANDLED; 1233d634bf2cSWei Liu } 1234d634bf2cSWei Liu 1235cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1236cf66f9d4SKonrad Rzeszutek Wilk static void xennet_poll_controller(struct net_device *dev) 1237cf66f9d4SKonrad Rzeszutek Wilk { 1238cf66f9d4SKonrad Rzeszutek Wilk xennet_interrupt(0, dev); 1239cf66f9d4SKonrad Rzeszutek Wilk } 1240cf66f9d4SKonrad Rzeszutek Wilk #endif 1241cf66f9d4SKonrad Rzeszutek Wilk 12420a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 12430a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 12440a0b9d2eSStephen Hemminger .ndo_uninit = xennet_uninit, 12450a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 12460a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 12470a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 1248e00f85beSstephen hemminger .ndo_get_stats64 = xennet_get_stats64, 12490a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 12500a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 1251fb507934SMichał Mirosław .ndo_fix_features = xennet_fix_features, 1252fb507934SMichał Mirosław .ndo_set_features = xennet_set_features, 1253cf66f9d4SKonrad Rzeszutek Wilk #ifdef CONFIG_NET_POLL_CONTROLLER 1254cf66f9d4SKonrad Rzeszutek Wilk .ndo_poll_controller = xennet_poll_controller, 1255cf66f9d4SKonrad Rzeszutek Wilk #endif 12560a0b9d2eSStephen Hemminger }; 12570a0b9d2eSStephen Hemminger 12588e0e46bbSBill Pemberton static struct net_device *xennet_create_dev(struct xenbus_device *dev) 12590d160211SJeremy Fitzhardinge { 12600d160211SJeremy Fitzhardinge int i, err; 12610d160211SJeremy Fitzhardinge struct net_device *netdev; 12620d160211SJeremy Fitzhardinge struct netfront_info *np; 12630d160211SJeremy Fitzhardinge 12640d160211SJeremy Fitzhardinge netdev = alloc_etherdev(sizeof(struct netfront_info)); 126541de8d4cSJoe Perches if (!netdev) 12660d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 12670d160211SJeremy Fitzhardinge 12680d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 12690d160211SJeremy Fitzhardinge np->xbdev = dev; 12700d160211SJeremy Fitzhardinge 12710d160211SJeremy Fitzhardinge spin_lock_init(&np->tx_lock); 12720d160211SJeremy Fitzhardinge spin_lock_init(&np->rx_lock); 12730d160211SJeremy Fitzhardinge 12740d160211SJeremy Fitzhardinge skb_queue_head_init(&np->rx_batch); 12750d160211SJeremy Fitzhardinge np->rx_target = RX_DFL_MIN_TARGET; 12760d160211SJeremy Fitzhardinge np->rx_min_target = RX_DFL_MIN_TARGET; 12770d160211SJeremy Fitzhardinge np->rx_max_target = RX_MAX_TARGET; 12780d160211SJeremy Fitzhardinge 12790d160211SJeremy Fitzhardinge init_timer(&np->rx_refill_timer); 12800d160211SJeremy Fitzhardinge np->rx_refill_timer.data = (unsigned long)netdev; 12810d160211SJeremy Fitzhardinge np->rx_refill_timer.function = rx_refill_timeout; 12820d160211SJeremy Fitzhardinge 1283e00f85beSstephen hemminger err = -ENOMEM; 12841c213bd2SWANG Cong np->stats = netdev_alloc_pcpu_stats(struct netfront_stats); 1285e00f85beSstephen hemminger if (np->stats == NULL) 1286e00f85beSstephen hemminger goto exit; 1287e00f85beSstephen hemminger 12880d160211SJeremy Fitzhardinge /* Initialise tx_skbs as a free chain containing every entry. */ 12890d160211SJeremy Fitzhardinge np->tx_skb_freelist = 0; 12900d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 12911ffb40b8SIsaku Yamahata skb_entry_set_link(&np->tx_skbs[i], i+1); 12920d160211SJeremy Fitzhardinge np->grant_tx_ref[i] = GRANT_INVALID_REF; 12930d160211SJeremy Fitzhardinge } 12940d160211SJeremy Fitzhardinge 12950d160211SJeremy Fitzhardinge /* Clear out rx_skbs */ 12960d160211SJeremy Fitzhardinge for (i = 0; i < NET_RX_RING_SIZE; i++) { 12970d160211SJeremy Fitzhardinge np->rx_skbs[i] = NULL; 12980d160211SJeremy Fitzhardinge np->grant_rx_ref[i] = GRANT_INVALID_REF; 1299cefe0078SAnnie Li np->grant_tx_page[i] = NULL; 13000d160211SJeremy Fitzhardinge } 13010d160211SJeremy Fitzhardinge 13020d160211SJeremy Fitzhardinge /* A grant for every tx ring slot */ 13030d160211SJeremy Fitzhardinge if (gnttab_alloc_grant_references(TX_MAX_TARGET, 13040d160211SJeremy Fitzhardinge &np->gref_tx_head) < 0) { 1305383eda32SJoe Perches pr_alert("can't alloc tx grant refs\n"); 13060d160211SJeremy Fitzhardinge err = -ENOMEM; 1307e00f85beSstephen hemminger goto exit_free_stats; 13080d160211SJeremy Fitzhardinge } 13090d160211SJeremy Fitzhardinge /* A grant for every rx ring slot */ 13100d160211SJeremy Fitzhardinge if (gnttab_alloc_grant_references(RX_MAX_TARGET, 13110d160211SJeremy Fitzhardinge &np->gref_rx_head) < 0) { 1312383eda32SJoe Perches pr_alert("can't alloc rx grant refs\n"); 13130d160211SJeremy Fitzhardinge err = -ENOMEM; 13140d160211SJeremy Fitzhardinge goto exit_free_tx; 13150d160211SJeremy Fitzhardinge } 13160d160211SJeremy Fitzhardinge 13170a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 13180a0b9d2eSStephen Hemminger 1319bea3348eSStephen Hemminger netif_napi_add(netdev, &np->napi, xennet_poll, 64); 1320fb507934SMichał Mirosław netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | 1321fb507934SMichał Mirosław NETIF_F_GSO_ROBUST; 13222c0057deSPaul Durrant netdev->hw_features = NETIF_F_SG | 13232c0057deSPaul Durrant NETIF_F_IPV6_CSUM | 13242c0057deSPaul Durrant NETIF_F_TSO | NETIF_F_TSO6; 13250d160211SJeremy Fitzhardinge 1326fc3e5941SIan Campbell /* 1327fc3e5941SIan Campbell * Assume that all hw features are available for now. This set 1328fc3e5941SIan Campbell * will be adjusted by the call to netdev_update_features() in 1329fc3e5941SIan Campbell * xennet_connect() which is the earliest point where we can 1330fc3e5941SIan Campbell * negotiate with the backend regarding supported features. 1331fc3e5941SIan Campbell */ 1332fc3e5941SIan Campbell netdev->features |= netdev->hw_features; 1333fc3e5941SIan Campbell 13340d160211SJeremy Fitzhardinge SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); 13350d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 13360d160211SJeremy Fitzhardinge 13379ecd1a75SWei Liu netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER); 13389ecd1a75SWei Liu 13390d160211SJeremy Fitzhardinge np->netdev = netdev; 13400d160211SJeremy Fitzhardinge 13410d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 13420d160211SJeremy Fitzhardinge 13430d160211SJeremy Fitzhardinge return netdev; 13440d160211SJeremy Fitzhardinge 13450d160211SJeremy Fitzhardinge exit_free_tx: 13460d160211SJeremy Fitzhardinge gnttab_free_grant_references(np->gref_tx_head); 1347e00f85beSstephen hemminger exit_free_stats: 1348e00f85beSstephen hemminger free_percpu(np->stats); 13490d160211SJeremy Fitzhardinge exit: 13500d160211SJeremy Fitzhardinge free_netdev(netdev); 13510d160211SJeremy Fitzhardinge return ERR_PTR(err); 13520d160211SJeremy Fitzhardinge } 13530d160211SJeremy Fitzhardinge 13540d160211SJeremy Fitzhardinge /** 13550d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 13560d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 13570d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 13580d160211SJeremy Fitzhardinge */ 13598e0e46bbSBill Pemberton static int netfront_probe(struct xenbus_device *dev, 13600d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 13610d160211SJeremy Fitzhardinge { 13620d160211SJeremy Fitzhardinge int err; 13630d160211SJeremy Fitzhardinge struct net_device *netdev; 13640d160211SJeremy Fitzhardinge struct netfront_info *info; 13650d160211SJeremy Fitzhardinge 13660d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 13670d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 13680d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 13690d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 13700d160211SJeremy Fitzhardinge return err; 13710d160211SJeremy Fitzhardinge } 13720d160211SJeremy Fitzhardinge 13730d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 13741b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 13750d160211SJeremy Fitzhardinge 13760d160211SJeremy Fitzhardinge err = register_netdev(info->netdev); 13770d160211SJeremy Fitzhardinge if (err) { 1378383eda32SJoe Perches pr_warn("%s: register_netdev err=%d\n", __func__, err); 13790d160211SJeremy Fitzhardinge goto fail; 13800d160211SJeremy Fitzhardinge } 13810d160211SJeremy Fitzhardinge 13820d160211SJeremy Fitzhardinge err = xennet_sysfs_addif(info->netdev); 13830d160211SJeremy Fitzhardinge if (err) { 13840d160211SJeremy Fitzhardinge unregister_netdev(info->netdev); 1385383eda32SJoe Perches pr_warn("%s: add sysfs failed err=%d\n", __func__, err); 13860d160211SJeremy Fitzhardinge goto fail; 13870d160211SJeremy Fitzhardinge } 13880d160211SJeremy Fitzhardinge 13890d160211SJeremy Fitzhardinge return 0; 13900d160211SJeremy Fitzhardinge 13910d160211SJeremy Fitzhardinge fail: 13920d160211SJeremy Fitzhardinge free_netdev(netdev); 13931b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, NULL); 13940d160211SJeremy Fitzhardinge return err; 13950d160211SJeremy Fitzhardinge } 13960d160211SJeremy Fitzhardinge 13970d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 13980d160211SJeremy Fitzhardinge { 13990d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 14000d160211SJeremy Fitzhardinge if (ref != GRANT_INVALID_REF) 14010d160211SJeremy Fitzhardinge gnttab_end_foreign_access(ref, 0, (unsigned long)page); 14020d160211SJeremy Fitzhardinge } 14030d160211SJeremy Fitzhardinge 14040d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 14050d160211SJeremy Fitzhardinge { 14060d160211SJeremy Fitzhardinge /* Stop old i/f to prevent errors whilst we rebuild the state. */ 14070d160211SJeremy Fitzhardinge spin_lock_bh(&info->rx_lock); 14080d160211SJeremy Fitzhardinge spin_lock_irq(&info->tx_lock); 14090d160211SJeremy Fitzhardinge netif_carrier_off(info->netdev); 14100d160211SJeremy Fitzhardinge spin_unlock_irq(&info->tx_lock); 14110d160211SJeremy Fitzhardinge spin_unlock_bh(&info->rx_lock); 14120d160211SJeremy Fitzhardinge 1413d634bf2cSWei Liu if (info->tx_irq && (info->tx_irq == info->rx_irq)) 1414d634bf2cSWei Liu unbind_from_irqhandler(info->tx_irq, info); 1415d634bf2cSWei Liu if (info->tx_irq && (info->tx_irq != info->rx_irq)) { 1416d634bf2cSWei Liu unbind_from_irqhandler(info->tx_irq, info); 1417d634bf2cSWei Liu unbind_from_irqhandler(info->rx_irq, info); 1418d634bf2cSWei Liu } 1419d634bf2cSWei Liu info->tx_evtchn = info->rx_evtchn = 0; 1420d634bf2cSWei Liu info->tx_irq = info->rx_irq = 0; 14210d160211SJeremy Fitzhardinge 14220d160211SJeremy Fitzhardinge /* End access and free the pages */ 14230d160211SJeremy Fitzhardinge xennet_end_access(info->tx_ring_ref, info->tx.sring); 14240d160211SJeremy Fitzhardinge xennet_end_access(info->rx_ring_ref, info->rx.sring); 14250d160211SJeremy Fitzhardinge 14260d160211SJeremy Fitzhardinge info->tx_ring_ref = GRANT_INVALID_REF; 14270d160211SJeremy Fitzhardinge info->rx_ring_ref = GRANT_INVALID_REF; 14280d160211SJeremy Fitzhardinge info->tx.sring = NULL; 14290d160211SJeremy Fitzhardinge info->rx.sring = NULL; 14300d160211SJeremy Fitzhardinge } 14310d160211SJeremy Fitzhardinge 14320d160211SJeremy Fitzhardinge /** 14330d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 14340d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 14350d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 14360d160211SJeremy Fitzhardinge * rest of the kernel. 14370d160211SJeremy Fitzhardinge */ 14380d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 14390d160211SJeremy Fitzhardinge { 14401b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 14410d160211SJeremy Fitzhardinge 14420d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 14430d160211SJeremy Fitzhardinge 14440d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 14450d160211SJeremy Fitzhardinge return 0; 14460d160211SJeremy Fitzhardinge } 14470d160211SJeremy Fitzhardinge 14480d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 14490d160211SJeremy Fitzhardinge { 14500d160211SJeremy Fitzhardinge char *s, *e, *macstr; 14510d160211SJeremy Fitzhardinge int i; 14520d160211SJeremy Fitzhardinge 14530d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 14540d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 14550d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 14560d160211SJeremy Fitzhardinge 14570d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 14580d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 14590d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 14600d160211SJeremy Fitzhardinge kfree(macstr); 14610d160211SJeremy Fitzhardinge return -ENOENT; 14620d160211SJeremy Fitzhardinge } 14630d160211SJeremy Fitzhardinge s = e+1; 14640d160211SJeremy Fitzhardinge } 14650d160211SJeremy Fitzhardinge 14660d160211SJeremy Fitzhardinge kfree(macstr); 14670d160211SJeremy Fitzhardinge return 0; 14680d160211SJeremy Fitzhardinge } 14690d160211SJeremy Fitzhardinge 1470d634bf2cSWei Liu static int setup_netfront_single(struct netfront_info *info) 1471d634bf2cSWei Liu { 1472d634bf2cSWei Liu int err; 1473d634bf2cSWei Liu 1474d634bf2cSWei Liu err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); 1475d634bf2cSWei Liu if (err < 0) 1476d634bf2cSWei Liu goto fail; 1477d634bf2cSWei Liu 1478d634bf2cSWei Liu err = bind_evtchn_to_irqhandler(info->tx_evtchn, 1479d634bf2cSWei Liu xennet_interrupt, 1480d634bf2cSWei Liu 0, info->netdev->name, info); 1481d634bf2cSWei Liu if (err < 0) 1482d634bf2cSWei Liu goto bind_fail; 1483d634bf2cSWei Liu info->rx_evtchn = info->tx_evtchn; 1484d634bf2cSWei Liu info->rx_irq = info->tx_irq = err; 1485d634bf2cSWei Liu 1486d634bf2cSWei Liu return 0; 1487d634bf2cSWei Liu 1488d634bf2cSWei Liu bind_fail: 1489d634bf2cSWei Liu xenbus_free_evtchn(info->xbdev, info->tx_evtchn); 1490d634bf2cSWei Liu info->tx_evtchn = 0; 1491d634bf2cSWei Liu fail: 1492d634bf2cSWei Liu return err; 1493d634bf2cSWei Liu } 1494d634bf2cSWei Liu 1495d634bf2cSWei Liu static int setup_netfront_split(struct netfront_info *info) 1496d634bf2cSWei Liu { 1497d634bf2cSWei Liu int err; 1498d634bf2cSWei Liu 1499d634bf2cSWei Liu err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); 1500d634bf2cSWei Liu if (err < 0) 1501d634bf2cSWei Liu goto fail; 1502d634bf2cSWei Liu err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn); 1503d634bf2cSWei Liu if (err < 0) 1504d634bf2cSWei Liu goto alloc_rx_evtchn_fail; 1505d634bf2cSWei Liu 1506d634bf2cSWei Liu snprintf(info->tx_irq_name, sizeof(info->tx_irq_name), 1507d634bf2cSWei Liu "%s-tx", info->netdev->name); 1508d634bf2cSWei Liu err = bind_evtchn_to_irqhandler(info->tx_evtchn, 1509d634bf2cSWei Liu xennet_tx_interrupt, 1510d634bf2cSWei Liu 0, info->tx_irq_name, info); 1511d634bf2cSWei Liu if (err < 0) 1512d634bf2cSWei Liu goto bind_tx_fail; 1513d634bf2cSWei Liu info->tx_irq = err; 1514d634bf2cSWei Liu 1515d634bf2cSWei Liu snprintf(info->rx_irq_name, sizeof(info->rx_irq_name), 1516d634bf2cSWei Liu "%s-rx", info->netdev->name); 1517d634bf2cSWei Liu err = bind_evtchn_to_irqhandler(info->rx_evtchn, 1518d634bf2cSWei Liu xennet_rx_interrupt, 1519d634bf2cSWei Liu 0, info->rx_irq_name, info); 1520d634bf2cSWei Liu if (err < 0) 1521d634bf2cSWei Liu goto bind_rx_fail; 1522d634bf2cSWei Liu info->rx_irq = err; 1523d634bf2cSWei Liu 1524d634bf2cSWei Liu return 0; 1525d634bf2cSWei Liu 1526d634bf2cSWei Liu bind_rx_fail: 1527d634bf2cSWei Liu unbind_from_irqhandler(info->tx_irq, info); 1528d634bf2cSWei Liu info->tx_irq = 0; 1529d634bf2cSWei Liu bind_tx_fail: 1530d634bf2cSWei Liu xenbus_free_evtchn(info->xbdev, info->rx_evtchn); 1531d634bf2cSWei Liu info->rx_evtchn = 0; 1532d634bf2cSWei Liu alloc_rx_evtchn_fail: 1533d634bf2cSWei Liu xenbus_free_evtchn(info->xbdev, info->tx_evtchn); 1534d634bf2cSWei Liu info->tx_evtchn = 0; 1535d634bf2cSWei Liu fail: 1536d634bf2cSWei Liu return err; 1537d634bf2cSWei Liu } 1538d634bf2cSWei Liu 15390d160211SJeremy Fitzhardinge static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) 15400d160211SJeremy Fitzhardinge { 15410d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 15420d160211SJeremy Fitzhardinge struct xen_netif_rx_sring *rxs; 15430d160211SJeremy Fitzhardinge int err; 15440d160211SJeremy Fitzhardinge struct net_device *netdev = info->netdev; 1545d634bf2cSWei Liu unsigned int feature_split_evtchn; 15460d160211SJeremy Fitzhardinge 15470d160211SJeremy Fitzhardinge info->tx_ring_ref = GRANT_INVALID_REF; 15480d160211SJeremy Fitzhardinge info->rx_ring_ref = GRANT_INVALID_REF; 15490d160211SJeremy Fitzhardinge info->rx.sring = NULL; 15500d160211SJeremy Fitzhardinge info->tx.sring = NULL; 15510d160211SJeremy Fitzhardinge netdev->irq = 0; 15520d160211SJeremy Fitzhardinge 1553d634bf2cSWei Liu err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, 1554d634bf2cSWei Liu "feature-split-event-channels", "%u", 1555d634bf2cSWei Liu &feature_split_evtchn); 1556d634bf2cSWei Liu if (err < 0) 1557d634bf2cSWei Liu feature_split_evtchn = 0; 1558d634bf2cSWei Liu 15590d160211SJeremy Fitzhardinge err = xen_net_read_mac(dev, netdev->dev_addr); 15600d160211SJeremy Fitzhardinge if (err) { 15610d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 15620d160211SJeremy Fitzhardinge goto fail; 15630d160211SJeremy Fitzhardinge } 15640d160211SJeremy Fitzhardinge 1565a144ff09SIan Campbell txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 15660d160211SJeremy Fitzhardinge if (!txs) { 15670d160211SJeremy Fitzhardinge err = -ENOMEM; 15680d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating tx ring page"); 15690d160211SJeremy Fitzhardinge goto fail; 15700d160211SJeremy Fitzhardinge } 15710d160211SJeremy Fitzhardinge SHARED_RING_INIT(txs); 15720d160211SJeremy Fitzhardinge FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); 15730d160211SJeremy Fitzhardinge 15740d160211SJeremy Fitzhardinge err = xenbus_grant_ring(dev, virt_to_mfn(txs)); 15751ca2983aSWei Liu if (err < 0) 15761ca2983aSWei Liu goto grant_tx_ring_fail; 15770d160211SJeremy Fitzhardinge 15780d160211SJeremy Fitzhardinge info->tx_ring_ref = err; 1579a144ff09SIan Campbell rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 15800d160211SJeremy Fitzhardinge if (!rxs) { 15810d160211SJeremy Fitzhardinge err = -ENOMEM; 15820d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating rx ring page"); 15831ca2983aSWei Liu goto alloc_rx_ring_fail; 15840d160211SJeremy Fitzhardinge } 15850d160211SJeremy Fitzhardinge SHARED_RING_INIT(rxs); 15860d160211SJeremy Fitzhardinge FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); 15870d160211SJeremy Fitzhardinge 15880d160211SJeremy Fitzhardinge err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); 15891ca2983aSWei Liu if (err < 0) 15901ca2983aSWei Liu goto grant_rx_ring_fail; 15910d160211SJeremy Fitzhardinge info->rx_ring_ref = err; 15920d160211SJeremy Fitzhardinge 1593d634bf2cSWei Liu if (feature_split_evtchn) 1594d634bf2cSWei Liu err = setup_netfront_split(info); 1595d634bf2cSWei Liu /* setup single event channel if 1596d634bf2cSWei Liu * a) feature-split-event-channels == 0 1597d634bf2cSWei Liu * b) feature-split-event-channels == 1 but failed to setup 1598d634bf2cSWei Liu */ 1599d634bf2cSWei Liu if (!feature_split_evtchn || (feature_split_evtchn && err)) 1600d634bf2cSWei Liu err = setup_netfront_single(info); 1601d634bf2cSWei Liu 16020d160211SJeremy Fitzhardinge if (err) 16031ca2983aSWei Liu goto alloc_evtchn_fail; 16040d160211SJeremy Fitzhardinge 16050d160211SJeremy Fitzhardinge return 0; 16060d160211SJeremy Fitzhardinge 16071ca2983aSWei Liu /* If we fail to setup netfront, it is safe to just revoke access to 16081ca2983aSWei Liu * granted pages because backend is not accessing it at this point. 16091ca2983aSWei Liu */ 16101ca2983aSWei Liu alloc_evtchn_fail: 16111ca2983aSWei Liu gnttab_end_foreign_access_ref(info->rx_ring_ref, 0); 16121ca2983aSWei Liu grant_rx_ring_fail: 16131ca2983aSWei Liu free_page((unsigned long)rxs); 16141ca2983aSWei Liu alloc_rx_ring_fail: 16151ca2983aSWei Liu gnttab_end_foreign_access_ref(info->tx_ring_ref, 0); 16161ca2983aSWei Liu grant_tx_ring_fail: 16171ca2983aSWei Liu free_page((unsigned long)txs); 16180d160211SJeremy Fitzhardinge fail: 16190d160211SJeremy Fitzhardinge return err; 16200d160211SJeremy Fitzhardinge } 16210d160211SJeremy Fitzhardinge 16220d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 1623f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 16240d160211SJeremy Fitzhardinge struct netfront_info *info) 16250d160211SJeremy Fitzhardinge { 16260d160211SJeremy Fitzhardinge const char *message; 16270d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 16280d160211SJeremy Fitzhardinge int err; 16290d160211SJeremy Fitzhardinge 16300d160211SJeremy Fitzhardinge /* Create shared ring, alloc event channel. */ 16310d160211SJeremy Fitzhardinge err = setup_netfront(dev, info); 16320d160211SJeremy Fitzhardinge if (err) 16330d160211SJeremy Fitzhardinge goto out; 16340d160211SJeremy Fitzhardinge 16350d160211SJeremy Fitzhardinge again: 16360d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 16370d160211SJeremy Fitzhardinge if (err) { 16380d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 16390d160211SJeremy Fitzhardinge goto destroy_ring; 16400d160211SJeremy Fitzhardinge } 16410d160211SJeremy Fitzhardinge 16420d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", 16430d160211SJeremy Fitzhardinge info->tx_ring_ref); 16440d160211SJeremy Fitzhardinge if (err) { 16450d160211SJeremy Fitzhardinge message = "writing tx ring-ref"; 16460d160211SJeremy Fitzhardinge goto abort_transaction; 16470d160211SJeremy Fitzhardinge } 16480d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", 16490d160211SJeremy Fitzhardinge info->rx_ring_ref); 16500d160211SJeremy Fitzhardinge if (err) { 16510d160211SJeremy Fitzhardinge message = "writing rx ring-ref"; 16520d160211SJeremy Fitzhardinge goto abort_transaction; 16530d160211SJeremy Fitzhardinge } 1654d634bf2cSWei Liu 1655d634bf2cSWei Liu if (info->tx_evtchn == info->rx_evtchn) { 16560d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, 1657d634bf2cSWei Liu "event-channel", "%u", info->tx_evtchn); 16580d160211SJeremy Fitzhardinge if (err) { 16590d160211SJeremy Fitzhardinge message = "writing event-channel"; 16600d160211SJeremy Fitzhardinge goto abort_transaction; 16610d160211SJeremy Fitzhardinge } 1662d634bf2cSWei Liu } else { 1663d634bf2cSWei Liu err = xenbus_printf(xbt, dev->nodename, 1664d634bf2cSWei Liu "event-channel-tx", "%u", info->tx_evtchn); 1665d634bf2cSWei Liu if (err) { 1666d634bf2cSWei Liu message = "writing event-channel-tx"; 1667d634bf2cSWei Liu goto abort_transaction; 1668d634bf2cSWei Liu } 1669d634bf2cSWei Liu err = xenbus_printf(xbt, dev->nodename, 1670d634bf2cSWei Liu "event-channel-rx", "%u", info->rx_evtchn); 1671d634bf2cSWei Liu if (err) { 1672d634bf2cSWei Liu message = "writing event-channel-rx"; 1673d634bf2cSWei Liu goto abort_transaction; 1674d634bf2cSWei Liu } 1675d634bf2cSWei Liu } 16760d160211SJeremy Fitzhardinge 16770d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 16780d160211SJeremy Fitzhardinge 1); 16790d160211SJeremy Fitzhardinge if (err) { 16800d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 16810d160211SJeremy Fitzhardinge goto abort_transaction; 16820d160211SJeremy Fitzhardinge } 16830d160211SJeremy Fitzhardinge 16840d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 16850d160211SJeremy Fitzhardinge if (err) { 16860d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 16870d160211SJeremy Fitzhardinge goto abort_transaction; 16880d160211SJeremy Fitzhardinge } 16890d160211SJeremy Fitzhardinge 16900d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 16910d160211SJeremy Fitzhardinge if (err) { 16920d160211SJeremy Fitzhardinge message = "writing feature-sg"; 16930d160211SJeremy Fitzhardinge goto abort_transaction; 16940d160211SJeremy Fitzhardinge } 16950d160211SJeremy Fitzhardinge 16960d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 16970d160211SJeremy Fitzhardinge if (err) { 16980d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 16990d160211SJeremy Fitzhardinge goto abort_transaction; 17000d160211SJeremy Fitzhardinge } 17010d160211SJeremy Fitzhardinge 17022c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); 17032c0057deSPaul Durrant if (err) { 17042c0057deSPaul Durrant message = "writing feature-gso-tcpv6"; 17052c0057deSPaul Durrant goto abort_transaction; 17062c0057deSPaul Durrant } 17072c0057deSPaul Durrant 17082c0057deSPaul Durrant err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", 17092c0057deSPaul Durrant "1"); 17102c0057deSPaul Durrant if (err) { 17112c0057deSPaul Durrant message = "writing feature-ipv6-csum-offload"; 17122c0057deSPaul Durrant goto abort_transaction; 17132c0057deSPaul Durrant } 17142c0057deSPaul Durrant 17150d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 17160d160211SJeremy Fitzhardinge if (err) { 17170d160211SJeremy Fitzhardinge if (err == -EAGAIN) 17180d160211SJeremy Fitzhardinge goto again; 17190d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 17200d160211SJeremy Fitzhardinge goto destroy_ring; 17210d160211SJeremy Fitzhardinge } 17220d160211SJeremy Fitzhardinge 17230d160211SJeremy Fitzhardinge return 0; 17240d160211SJeremy Fitzhardinge 17250d160211SJeremy Fitzhardinge abort_transaction: 17260d160211SJeremy Fitzhardinge xenbus_transaction_end(xbt, 1); 17270d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 17280d160211SJeremy Fitzhardinge destroy_ring: 17290d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 17300d160211SJeremy Fitzhardinge out: 17310d160211SJeremy Fitzhardinge return err; 17320d160211SJeremy Fitzhardinge } 17330d160211SJeremy Fitzhardinge 17340d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 17350d160211SJeremy Fitzhardinge { 17360d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 17370d160211SJeremy Fitzhardinge int i, requeue_idx, err; 17380d160211SJeremy Fitzhardinge struct sk_buff *skb; 17390d160211SJeremy Fitzhardinge grant_ref_t ref; 17400d160211SJeremy Fitzhardinge struct xen_netif_rx_request *req; 17410d160211SJeremy Fitzhardinge unsigned int feature_rx_copy; 17420d160211SJeremy Fitzhardinge 17430d160211SJeremy Fitzhardinge err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, 17440d160211SJeremy Fitzhardinge "feature-rx-copy", "%u", &feature_rx_copy); 17450d160211SJeremy Fitzhardinge if (err != 1) 17460d160211SJeremy Fitzhardinge feature_rx_copy = 0; 17470d160211SJeremy Fitzhardinge 17480d160211SJeremy Fitzhardinge if (!feature_rx_copy) { 17490d160211SJeremy Fitzhardinge dev_info(&dev->dev, 1750898eb71cSJoe Perches "backend does not support copying receive path\n"); 17510d160211SJeremy Fitzhardinge return -ENODEV; 17520d160211SJeremy Fitzhardinge } 17530d160211SJeremy Fitzhardinge 1754f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 17550d160211SJeremy Fitzhardinge if (err) 17560d160211SJeremy Fitzhardinge return err; 17570d160211SJeremy Fitzhardinge 17581ba37c51SIan Campbell rtnl_lock(); 1759fb507934SMichał Mirosław netdev_update_features(dev); 17601ba37c51SIan Campbell rtnl_unlock(); 17610d160211SJeremy Fitzhardinge 17620d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 17630d160211SJeremy Fitzhardinge spin_lock_irq(&np->tx_lock); 17640d160211SJeremy Fitzhardinge 17650d160211SJeremy Fitzhardinge /* Step 1: Discard all pending TX packet fragments. */ 17660d160211SJeremy Fitzhardinge xennet_release_tx_bufs(np); 17670d160211SJeremy Fitzhardinge 17680d160211SJeremy Fitzhardinge /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ 17690d160211SJeremy Fitzhardinge for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { 177001c68026SIan Campbell skb_frag_t *frag; 177101c68026SIan Campbell const struct page *page; 17720d160211SJeremy Fitzhardinge if (!np->rx_skbs[i]) 17730d160211SJeremy Fitzhardinge continue; 17740d160211SJeremy Fitzhardinge 17750d160211SJeremy Fitzhardinge skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); 17760d160211SJeremy Fitzhardinge ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); 17770d160211SJeremy Fitzhardinge req = RING_GET_REQUEST(&np->rx, requeue_idx); 17780d160211SJeremy Fitzhardinge 177901c68026SIan Campbell frag = &skb_shinfo(skb)->frags[0]; 178001c68026SIan Campbell page = skb_frag_page(frag); 17810d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref( 17820d160211SJeremy Fitzhardinge ref, np->xbdev->otherend_id, 178301c68026SIan Campbell pfn_to_mfn(page_to_pfn(page)), 17840d160211SJeremy Fitzhardinge 0); 17850d160211SJeremy Fitzhardinge req->gref = ref; 17860d160211SJeremy Fitzhardinge req->id = requeue_idx; 17870d160211SJeremy Fitzhardinge 17880d160211SJeremy Fitzhardinge requeue_idx++; 17890d160211SJeremy Fitzhardinge } 17900d160211SJeremy Fitzhardinge 17910d160211SJeremy Fitzhardinge np->rx.req_prod_pvt = requeue_idx; 17920d160211SJeremy Fitzhardinge 17930d160211SJeremy Fitzhardinge /* 17940d160211SJeremy Fitzhardinge * Step 3: All public and private state should now be sane. Get 17950d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 17960d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 17970d160211SJeremy Fitzhardinge * packets. 17980d160211SJeremy Fitzhardinge */ 17990d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 1800d634bf2cSWei Liu notify_remote_via_irq(np->tx_irq); 1801d634bf2cSWei Liu if (np->tx_irq != np->rx_irq) 1802d634bf2cSWei Liu notify_remote_via_irq(np->rx_irq); 18030d160211SJeremy Fitzhardinge xennet_tx_buf_gc(dev); 18040d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(dev); 18050d160211SJeremy Fitzhardinge 18060d160211SJeremy Fitzhardinge spin_unlock_irq(&np->tx_lock); 18070d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 18080d160211SJeremy Fitzhardinge 18090d160211SJeremy Fitzhardinge return 0; 18100d160211SJeremy Fitzhardinge } 18110d160211SJeremy Fitzhardinge 18120d160211SJeremy Fitzhardinge /** 18130d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 18140d160211SJeremy Fitzhardinge */ 1815f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 18160d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 18170d160211SJeremy Fitzhardinge { 18181b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 18190d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 18200d160211SJeremy Fitzhardinge 18210d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 18220d160211SJeremy Fitzhardinge 18230d160211SJeremy Fitzhardinge switch (backend_state) { 18240d160211SJeremy Fitzhardinge case XenbusStateInitialising: 18250d160211SJeremy Fitzhardinge case XenbusStateInitialised: 1826b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 1827b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 18280d160211SJeremy Fitzhardinge case XenbusStateUnknown: 18290d160211SJeremy Fitzhardinge break; 18300d160211SJeremy Fitzhardinge 18310d160211SJeremy Fitzhardinge case XenbusStateInitWait: 18320d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 18330d160211SJeremy Fitzhardinge break; 18340d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 18350d160211SJeremy Fitzhardinge break; 18360d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 183708e34eb1SLaszlo Ersek break; 183808e34eb1SLaszlo Ersek 183908e34eb1SLaszlo Ersek case XenbusStateConnected: 1840ee89bab1SAmerigo Wang netdev_notify_peers(netdev); 18410d160211SJeremy Fitzhardinge break; 18420d160211SJeremy Fitzhardinge 1843bce3ea81SDavid Vrabel case XenbusStateClosed: 1844bce3ea81SDavid Vrabel if (dev->state == XenbusStateClosed) 1845bce3ea81SDavid Vrabel break; 1846bce3ea81SDavid Vrabel /* Missed the backend's CLOSING state -- fallthrough */ 18470d160211SJeremy Fitzhardinge case XenbusStateClosing: 18480d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 18490d160211SJeremy Fitzhardinge break; 18500d160211SJeremy Fitzhardinge } 18510d160211SJeremy Fitzhardinge } 18520d160211SJeremy Fitzhardinge 1853e0ce4af9SIan Campbell static const struct xennet_stat { 1854e0ce4af9SIan Campbell char name[ETH_GSTRING_LEN]; 1855e0ce4af9SIan Campbell u16 offset; 1856e0ce4af9SIan Campbell } xennet_stats[] = { 1857e0ce4af9SIan Campbell { 1858e0ce4af9SIan Campbell "rx_gso_checksum_fixup", 1859e0ce4af9SIan Campbell offsetof(struct netfront_info, rx_gso_checksum_fixup) 1860e0ce4af9SIan Campbell }, 1861e0ce4af9SIan Campbell }; 1862e0ce4af9SIan Campbell 1863e0ce4af9SIan Campbell static int xennet_get_sset_count(struct net_device *dev, int string_set) 1864e0ce4af9SIan Campbell { 1865e0ce4af9SIan Campbell switch (string_set) { 1866e0ce4af9SIan Campbell case ETH_SS_STATS: 1867e0ce4af9SIan Campbell return ARRAY_SIZE(xennet_stats); 1868e0ce4af9SIan Campbell default: 1869e0ce4af9SIan Campbell return -EINVAL; 1870e0ce4af9SIan Campbell } 1871e0ce4af9SIan Campbell } 1872e0ce4af9SIan Campbell 1873e0ce4af9SIan Campbell static void xennet_get_ethtool_stats(struct net_device *dev, 1874e0ce4af9SIan Campbell struct ethtool_stats *stats, u64 * data) 1875e0ce4af9SIan Campbell { 1876e0ce4af9SIan Campbell void *np = netdev_priv(dev); 1877e0ce4af9SIan Campbell int i; 1878e0ce4af9SIan Campbell 1879e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 188048f26d51SEric Dumazet data[i] = *(unsigned long *)(np + xennet_stats[i].offset); 1881e0ce4af9SIan Campbell } 1882e0ce4af9SIan Campbell 1883e0ce4af9SIan Campbell static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) 1884e0ce4af9SIan Campbell { 1885e0ce4af9SIan Campbell int i; 1886e0ce4af9SIan Campbell 1887e0ce4af9SIan Campbell switch (stringset) { 1888e0ce4af9SIan Campbell case ETH_SS_STATS: 1889e0ce4af9SIan Campbell for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) 1890e0ce4af9SIan Campbell memcpy(data + i * ETH_GSTRING_LEN, 1891e0ce4af9SIan Campbell xennet_stats[i].name, ETH_GSTRING_LEN); 1892e0ce4af9SIan Campbell break; 1893e0ce4af9SIan Campbell } 1894e0ce4af9SIan Campbell } 1895e0ce4af9SIan Campbell 18960fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 18970d160211SJeremy Fitzhardinge { 18980d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 1899e0ce4af9SIan Campbell 1900e0ce4af9SIan Campbell .get_sset_count = xennet_get_sset_count, 1901e0ce4af9SIan Campbell .get_ethtool_stats = xennet_get_ethtool_stats, 1902e0ce4af9SIan Campbell .get_strings = xennet_get_strings, 19030d160211SJeremy Fitzhardinge }; 19040d160211SJeremy Fitzhardinge 19050d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 19060d160211SJeremy Fitzhardinge static ssize_t show_rxbuf_min(struct device *dev, 19070d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 19080d160211SJeremy Fitzhardinge { 19090d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 19100d160211SJeremy Fitzhardinge struct netfront_info *info = netdev_priv(netdev); 19110d160211SJeremy Fitzhardinge 19120d160211SJeremy Fitzhardinge return sprintf(buf, "%u\n", info->rx_min_target); 19130d160211SJeremy Fitzhardinge } 19140d160211SJeremy Fitzhardinge 19150d160211SJeremy Fitzhardinge static ssize_t store_rxbuf_min(struct device *dev, 19160d160211SJeremy Fitzhardinge struct device_attribute *attr, 19170d160211SJeremy Fitzhardinge const char *buf, size_t len) 19180d160211SJeremy Fitzhardinge { 19190d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 19200d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(netdev); 19210d160211SJeremy Fitzhardinge char *endp; 19220d160211SJeremy Fitzhardinge unsigned long target; 19230d160211SJeremy Fitzhardinge 19240d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 19250d160211SJeremy Fitzhardinge return -EPERM; 19260d160211SJeremy Fitzhardinge 19270d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 19280d160211SJeremy Fitzhardinge if (endp == buf) 19290d160211SJeremy Fitzhardinge return -EBADMSG; 19300d160211SJeremy Fitzhardinge 19310d160211SJeremy Fitzhardinge if (target < RX_MIN_TARGET) 19320d160211SJeremy Fitzhardinge target = RX_MIN_TARGET; 19330d160211SJeremy Fitzhardinge if (target > RX_MAX_TARGET) 19340d160211SJeremy Fitzhardinge target = RX_MAX_TARGET; 19350d160211SJeremy Fitzhardinge 19360d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 19370d160211SJeremy Fitzhardinge if (target > np->rx_max_target) 19380d160211SJeremy Fitzhardinge np->rx_max_target = target; 19390d160211SJeremy Fitzhardinge np->rx_min_target = target; 19400d160211SJeremy Fitzhardinge if (target > np->rx_target) 19410d160211SJeremy Fitzhardinge np->rx_target = target; 19420d160211SJeremy Fitzhardinge 19430d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(netdev); 19440d160211SJeremy Fitzhardinge 19450d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 19460d160211SJeremy Fitzhardinge return len; 19470d160211SJeremy Fitzhardinge } 19480d160211SJeremy Fitzhardinge 19490d160211SJeremy Fitzhardinge static ssize_t show_rxbuf_max(struct device *dev, 19500d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 19510d160211SJeremy Fitzhardinge { 19520d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 19530d160211SJeremy Fitzhardinge struct netfront_info *info = netdev_priv(netdev); 19540d160211SJeremy Fitzhardinge 19550d160211SJeremy Fitzhardinge return sprintf(buf, "%u\n", info->rx_max_target); 19560d160211SJeremy Fitzhardinge } 19570d160211SJeremy Fitzhardinge 19580d160211SJeremy Fitzhardinge static ssize_t store_rxbuf_max(struct device *dev, 19590d160211SJeremy Fitzhardinge struct device_attribute *attr, 19600d160211SJeremy Fitzhardinge const char *buf, size_t len) 19610d160211SJeremy Fitzhardinge { 19620d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 19630d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(netdev); 19640d160211SJeremy Fitzhardinge char *endp; 19650d160211SJeremy Fitzhardinge unsigned long target; 19660d160211SJeremy Fitzhardinge 19670d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 19680d160211SJeremy Fitzhardinge return -EPERM; 19690d160211SJeremy Fitzhardinge 19700d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 19710d160211SJeremy Fitzhardinge if (endp == buf) 19720d160211SJeremy Fitzhardinge return -EBADMSG; 19730d160211SJeremy Fitzhardinge 19740d160211SJeremy Fitzhardinge if (target < RX_MIN_TARGET) 19750d160211SJeremy Fitzhardinge target = RX_MIN_TARGET; 19760d160211SJeremy Fitzhardinge if (target > RX_MAX_TARGET) 19770d160211SJeremy Fitzhardinge target = RX_MAX_TARGET; 19780d160211SJeremy Fitzhardinge 19790d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 19800d160211SJeremy Fitzhardinge if (target < np->rx_min_target) 19810d160211SJeremy Fitzhardinge np->rx_min_target = target; 19820d160211SJeremy Fitzhardinge np->rx_max_target = target; 19830d160211SJeremy Fitzhardinge if (target < np->rx_target) 19840d160211SJeremy Fitzhardinge np->rx_target = target; 19850d160211SJeremy Fitzhardinge 19860d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(netdev); 19870d160211SJeremy Fitzhardinge 19880d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 19890d160211SJeremy Fitzhardinge return len; 19900d160211SJeremy Fitzhardinge } 19910d160211SJeremy Fitzhardinge 19920d160211SJeremy Fitzhardinge static ssize_t show_rxbuf_cur(struct device *dev, 19930d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 19940d160211SJeremy Fitzhardinge { 19950d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 19960d160211SJeremy Fitzhardinge struct netfront_info *info = netdev_priv(netdev); 19970d160211SJeremy Fitzhardinge 19980d160211SJeremy Fitzhardinge return sprintf(buf, "%u\n", info->rx_target); 19990d160211SJeremy Fitzhardinge } 20000d160211SJeremy Fitzhardinge 20010d160211SJeremy Fitzhardinge static struct device_attribute xennet_attrs[] = { 20020d160211SJeremy Fitzhardinge __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), 20030d160211SJeremy Fitzhardinge __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), 20040d160211SJeremy Fitzhardinge __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), 20050d160211SJeremy Fitzhardinge }; 20060d160211SJeremy Fitzhardinge 20070d160211SJeremy Fitzhardinge static int xennet_sysfs_addif(struct net_device *netdev) 20080d160211SJeremy Fitzhardinge { 20090d160211SJeremy Fitzhardinge int i; 20100d160211SJeremy Fitzhardinge int err; 20110d160211SJeremy Fitzhardinge 20120d160211SJeremy Fitzhardinge for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { 20130d160211SJeremy Fitzhardinge err = device_create_file(&netdev->dev, 20140d160211SJeremy Fitzhardinge &xennet_attrs[i]); 20150d160211SJeremy Fitzhardinge if (err) 20160d160211SJeremy Fitzhardinge goto fail; 20170d160211SJeremy Fitzhardinge } 20180d160211SJeremy Fitzhardinge return 0; 20190d160211SJeremy Fitzhardinge 20200d160211SJeremy Fitzhardinge fail: 20210d160211SJeremy Fitzhardinge while (--i >= 0) 20220d160211SJeremy Fitzhardinge device_remove_file(&netdev->dev, &xennet_attrs[i]); 20230d160211SJeremy Fitzhardinge return err; 20240d160211SJeremy Fitzhardinge } 20250d160211SJeremy Fitzhardinge 20260d160211SJeremy Fitzhardinge static void xennet_sysfs_delif(struct net_device *netdev) 20270d160211SJeremy Fitzhardinge { 20280d160211SJeremy Fitzhardinge int i; 20290d160211SJeremy Fitzhardinge 20300d160211SJeremy Fitzhardinge for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) 20310d160211SJeremy Fitzhardinge device_remove_file(&netdev->dev, &xennet_attrs[i]); 20320d160211SJeremy Fitzhardinge } 20330d160211SJeremy Fitzhardinge 20340d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 20350d160211SJeremy Fitzhardinge 203673db144bSJan Beulich static const struct xenbus_device_id netfront_ids[] = { 20370d160211SJeremy Fitzhardinge { "vif" }, 20380d160211SJeremy Fitzhardinge { "" } 20390d160211SJeremy Fitzhardinge }; 20400d160211SJeremy Fitzhardinge 20410d160211SJeremy Fitzhardinge 20428e0e46bbSBill Pemberton static int xennet_remove(struct xenbus_device *dev) 20430d160211SJeremy Fitzhardinge { 20441b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 20450d160211SJeremy Fitzhardinge 20460d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 20470d160211SJeremy Fitzhardinge 20480d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 20490d160211SJeremy Fitzhardinge 20500d160211SJeremy Fitzhardinge xennet_sysfs_delif(info->netdev); 20510d160211SJeremy Fitzhardinge 20526bc96d04SIan Campbell unregister_netdev(info->netdev); 20536bc96d04SIan Campbell 20546bc96d04SIan Campbell del_timer_sync(&info->rx_refill_timer); 20556bc96d04SIan Campbell 2056e00f85beSstephen hemminger free_percpu(info->stats); 2057e00f85beSstephen hemminger 20580d160211SJeremy Fitzhardinge free_netdev(info->netdev); 20590d160211SJeremy Fitzhardinge 20600d160211SJeremy Fitzhardinge return 0; 20610d160211SJeremy Fitzhardinge } 20620d160211SJeremy Fitzhardinge 206373db144bSJan Beulich static DEFINE_XENBUS_DRIVER(netfront, , 20640d160211SJeremy Fitzhardinge .probe = netfront_probe, 20658e0e46bbSBill Pemberton .remove = xennet_remove, 20660d160211SJeremy Fitzhardinge .resume = netfront_resume, 2067f502bf2bSIan Campbell .otherend_changed = netback_changed, 206873db144bSJan Beulich ); 20690d160211SJeremy Fitzhardinge 20700d160211SJeremy Fitzhardinge static int __init netif_init(void) 20710d160211SJeremy Fitzhardinge { 20726e833587SJeremy Fitzhardinge if (!xen_domain()) 20730d160211SJeremy Fitzhardinge return -ENODEV; 20740d160211SJeremy Fitzhardinge 207551c71a3bSKonrad Rzeszutek Wilk if (!xen_has_pv_nic_devices()) 2076b9136d20SIgor Mammedov return -ENODEV; 2077b9136d20SIgor Mammedov 2078383eda32SJoe Perches pr_info("Initialising Xen virtual ethernet driver\n"); 20790d160211SJeremy Fitzhardinge 2080ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 20810d160211SJeremy Fitzhardinge } 20820d160211SJeremy Fitzhardinge module_init(netif_init); 20830d160211SJeremy Fitzhardinge 20840d160211SJeremy Fitzhardinge 20850d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 20860d160211SJeremy Fitzhardinge { 2087ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 20880d160211SJeremy Fitzhardinge } 20890d160211SJeremy Fitzhardinge module_exit(netif_exit); 20900d160211SJeremy Fitzhardinge 20910d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 20920d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 2093d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 20944f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 2095