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 320d160211SJeremy Fitzhardinge #include <linux/module.h> 330d160211SJeremy Fitzhardinge #include <linux/kernel.h> 340d160211SJeremy Fitzhardinge #include <linux/netdevice.h> 350d160211SJeremy Fitzhardinge #include <linux/etherdevice.h> 360d160211SJeremy Fitzhardinge #include <linux/skbuff.h> 370d160211SJeremy Fitzhardinge #include <linux/ethtool.h> 380d160211SJeremy Fitzhardinge #include <linux/if_ether.h> 390d160211SJeremy Fitzhardinge #include <linux/tcp.h> 400d160211SJeremy Fitzhardinge #include <linux/udp.h> 410d160211SJeremy Fitzhardinge #include <linux/moduleparam.h> 420d160211SJeremy Fitzhardinge #include <linux/mm.h> 435a0e3ad6STejun Heo #include <linux/slab.h> 440d160211SJeremy Fitzhardinge #include <net/ip.h> 450d160211SJeremy Fitzhardinge 461ccbf534SJeremy Fitzhardinge #include <xen/xen.h> 470d160211SJeremy Fitzhardinge #include <xen/xenbus.h> 480d160211SJeremy Fitzhardinge #include <xen/events.h> 490d160211SJeremy Fitzhardinge #include <xen/page.h> 500d160211SJeremy Fitzhardinge #include <xen/grant_table.h> 510d160211SJeremy Fitzhardinge 520d160211SJeremy Fitzhardinge #include <xen/interface/io/netif.h> 530d160211SJeremy Fitzhardinge #include <xen/interface/memory.h> 540d160211SJeremy Fitzhardinge #include <xen/interface/grant_table.h> 550d160211SJeremy Fitzhardinge 560fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops; 570d160211SJeremy Fitzhardinge 580d160211SJeremy Fitzhardinge struct netfront_cb { 590d160211SJeremy Fitzhardinge struct page *page; 600d160211SJeremy Fitzhardinge unsigned offset; 610d160211SJeremy Fitzhardinge }; 620d160211SJeremy Fitzhardinge 630d160211SJeremy Fitzhardinge #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) 640d160211SJeremy Fitzhardinge 650d160211SJeremy Fitzhardinge #define RX_COPY_THRESHOLD 256 660d160211SJeremy Fitzhardinge 670d160211SJeremy Fitzhardinge #define GRANT_INVALID_REF 0 680d160211SJeremy Fitzhardinge 69667c78afSJeremy Fitzhardinge #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) 70667c78afSJeremy Fitzhardinge #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) 710d160211SJeremy Fitzhardinge #define TX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) 720d160211SJeremy Fitzhardinge 730d160211SJeremy Fitzhardinge struct netfront_info { 740d160211SJeremy Fitzhardinge struct list_head list; 750d160211SJeremy Fitzhardinge struct net_device *netdev; 760d160211SJeremy Fitzhardinge 77bea3348eSStephen Hemminger struct napi_struct napi; 780d160211SJeremy Fitzhardinge 7984284d3cSJeremy Fitzhardinge unsigned int evtchn; 8084284d3cSJeremy Fitzhardinge struct xenbus_device *xbdev; 810d160211SJeremy Fitzhardinge 820d160211SJeremy Fitzhardinge spinlock_t tx_lock; 8384284d3cSJeremy Fitzhardinge struct xen_netif_tx_front_ring tx; 8484284d3cSJeremy Fitzhardinge int tx_ring_ref; 850d160211SJeremy Fitzhardinge 860d160211SJeremy Fitzhardinge /* 870d160211SJeremy Fitzhardinge * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries 880d160211SJeremy Fitzhardinge * are linked from tx_skb_freelist through skb_entry.link. 890d160211SJeremy Fitzhardinge * 900d160211SJeremy Fitzhardinge * NB. Freelist index entries are always going to be less than 910d160211SJeremy Fitzhardinge * PAGE_OFFSET, whereas pointers to skbs will always be equal or 920d160211SJeremy Fitzhardinge * greater than PAGE_OFFSET: we use this property to distinguish 930d160211SJeremy Fitzhardinge * them. 940d160211SJeremy Fitzhardinge */ 950d160211SJeremy Fitzhardinge union skb_entry { 960d160211SJeremy Fitzhardinge struct sk_buff *skb; 971ffb40b8SIsaku Yamahata unsigned long link; 980d160211SJeremy Fitzhardinge } tx_skbs[NET_TX_RING_SIZE]; 990d160211SJeremy Fitzhardinge grant_ref_t gref_tx_head; 1000d160211SJeremy Fitzhardinge grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; 1010d160211SJeremy Fitzhardinge unsigned tx_skb_freelist; 1020d160211SJeremy Fitzhardinge 10384284d3cSJeremy Fitzhardinge spinlock_t rx_lock ____cacheline_aligned_in_smp; 10484284d3cSJeremy Fitzhardinge struct xen_netif_rx_front_ring rx; 10584284d3cSJeremy Fitzhardinge int rx_ring_ref; 10684284d3cSJeremy Fitzhardinge 10784284d3cSJeremy Fitzhardinge /* Receive-ring batched refills. */ 10884284d3cSJeremy Fitzhardinge #define RX_MIN_TARGET 8 10984284d3cSJeremy Fitzhardinge #define RX_DFL_MIN_TARGET 64 11084284d3cSJeremy Fitzhardinge #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) 11184284d3cSJeremy Fitzhardinge unsigned rx_min_target, rx_max_target, rx_target; 11284284d3cSJeremy Fitzhardinge struct sk_buff_head rx_batch; 11384284d3cSJeremy Fitzhardinge 11484284d3cSJeremy Fitzhardinge struct timer_list rx_refill_timer; 11584284d3cSJeremy Fitzhardinge 1160d160211SJeremy Fitzhardinge struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; 1170d160211SJeremy Fitzhardinge grant_ref_t gref_rx_head; 1180d160211SJeremy Fitzhardinge grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; 1190d160211SJeremy Fitzhardinge 1200d160211SJeremy Fitzhardinge unsigned long rx_pfn_array[NET_RX_RING_SIZE]; 1210d160211SJeremy Fitzhardinge struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; 1220d160211SJeremy Fitzhardinge struct mmu_update rx_mmu[NET_RX_RING_SIZE]; 1230d160211SJeremy Fitzhardinge }; 1240d160211SJeremy Fitzhardinge 1250d160211SJeremy Fitzhardinge struct netfront_rx_info { 1260d160211SJeremy Fitzhardinge struct xen_netif_rx_response rx; 1270d160211SJeremy Fitzhardinge struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 1280d160211SJeremy Fitzhardinge }; 1290d160211SJeremy Fitzhardinge 1301ffb40b8SIsaku Yamahata static void skb_entry_set_link(union skb_entry *list, unsigned short id) 1311ffb40b8SIsaku Yamahata { 1321ffb40b8SIsaku Yamahata list->link = id; 1331ffb40b8SIsaku Yamahata } 1341ffb40b8SIsaku Yamahata 1351ffb40b8SIsaku Yamahata static int skb_entry_is_link(const union skb_entry *list) 1361ffb40b8SIsaku Yamahata { 1371ffb40b8SIsaku Yamahata BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); 138807540baSEric Dumazet return (unsigned long)list->skb < PAGE_OFFSET; 1391ffb40b8SIsaku Yamahata } 1401ffb40b8SIsaku Yamahata 1410d160211SJeremy Fitzhardinge /* 1420d160211SJeremy Fitzhardinge * Access macros for acquiring freeing slots in tx_skbs[]. 1430d160211SJeremy Fitzhardinge */ 1440d160211SJeremy Fitzhardinge 1450d160211SJeremy Fitzhardinge static void add_id_to_freelist(unsigned *head, union skb_entry *list, 1460d160211SJeremy Fitzhardinge unsigned short id) 1470d160211SJeremy Fitzhardinge { 1481ffb40b8SIsaku Yamahata skb_entry_set_link(&list[id], *head); 1490d160211SJeremy Fitzhardinge *head = id; 1500d160211SJeremy Fitzhardinge } 1510d160211SJeremy Fitzhardinge 1520d160211SJeremy Fitzhardinge static unsigned short get_id_from_freelist(unsigned *head, 1530d160211SJeremy Fitzhardinge union skb_entry *list) 1540d160211SJeremy Fitzhardinge { 1550d160211SJeremy Fitzhardinge unsigned int id = *head; 1560d160211SJeremy Fitzhardinge *head = list[id].link; 1570d160211SJeremy Fitzhardinge return id; 1580d160211SJeremy Fitzhardinge } 1590d160211SJeremy Fitzhardinge 1600d160211SJeremy Fitzhardinge static int xennet_rxidx(RING_IDX idx) 1610d160211SJeremy Fitzhardinge { 1620d160211SJeremy Fitzhardinge return idx & (NET_RX_RING_SIZE - 1); 1630d160211SJeremy Fitzhardinge } 1640d160211SJeremy Fitzhardinge 1650d160211SJeremy Fitzhardinge static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, 1660d160211SJeremy Fitzhardinge RING_IDX ri) 1670d160211SJeremy Fitzhardinge { 1680d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 1690d160211SJeremy Fitzhardinge struct sk_buff *skb = np->rx_skbs[i]; 1700d160211SJeremy Fitzhardinge np->rx_skbs[i] = NULL; 1710d160211SJeremy Fitzhardinge return skb; 1720d160211SJeremy Fitzhardinge } 1730d160211SJeremy Fitzhardinge 1740d160211SJeremy Fitzhardinge static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, 1750d160211SJeremy Fitzhardinge RING_IDX ri) 1760d160211SJeremy Fitzhardinge { 1770d160211SJeremy Fitzhardinge int i = xennet_rxidx(ri); 1780d160211SJeremy Fitzhardinge grant_ref_t ref = np->grant_rx_ref[i]; 1790d160211SJeremy Fitzhardinge np->grant_rx_ref[i] = GRANT_INVALID_REF; 1800d160211SJeremy Fitzhardinge return ref; 1810d160211SJeremy Fitzhardinge } 1820d160211SJeremy Fitzhardinge 1830d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 1840d160211SJeremy Fitzhardinge static int xennet_sysfs_addif(struct net_device *netdev); 1850d160211SJeremy Fitzhardinge static void xennet_sysfs_delif(struct net_device *netdev); 1860d160211SJeremy Fitzhardinge #else /* !CONFIG_SYSFS */ 1870d160211SJeremy Fitzhardinge #define xennet_sysfs_addif(dev) (0) 1880d160211SJeremy Fitzhardinge #define xennet_sysfs_delif(dev) do { } while (0) 1890d160211SJeremy Fitzhardinge #endif 1900d160211SJeremy Fitzhardinge 1910d160211SJeremy Fitzhardinge static int xennet_can_sg(struct net_device *dev) 1920d160211SJeremy Fitzhardinge { 1930d160211SJeremy Fitzhardinge return dev->features & NETIF_F_SG; 1940d160211SJeremy Fitzhardinge } 1950d160211SJeremy Fitzhardinge 1960d160211SJeremy Fitzhardinge 1970d160211SJeremy Fitzhardinge static void rx_refill_timeout(unsigned long data) 1980d160211SJeremy Fitzhardinge { 1990d160211SJeremy Fitzhardinge struct net_device *dev = (struct net_device *)data; 200bea3348eSStephen Hemminger struct netfront_info *np = netdev_priv(dev); 201288379f0SBen Hutchings napi_schedule(&np->napi); 2020d160211SJeremy Fitzhardinge } 2030d160211SJeremy Fitzhardinge 2040d160211SJeremy Fitzhardinge static int netfront_tx_slot_available(struct netfront_info *np) 2050d160211SJeremy Fitzhardinge { 206807540baSEric Dumazet return (np->tx.req_prod_pvt - np->tx.rsp_cons) < 207807540baSEric Dumazet (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); 2080d160211SJeremy Fitzhardinge } 2090d160211SJeremy Fitzhardinge 2100d160211SJeremy Fitzhardinge static void xennet_maybe_wake_tx(struct net_device *dev) 2110d160211SJeremy Fitzhardinge { 2120d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 2130d160211SJeremy Fitzhardinge 2140d160211SJeremy Fitzhardinge if (unlikely(netif_queue_stopped(dev)) && 2150d160211SJeremy Fitzhardinge netfront_tx_slot_available(np) && 2160d160211SJeremy Fitzhardinge likely(netif_running(dev))) 2170d160211SJeremy Fitzhardinge netif_wake_queue(dev); 2180d160211SJeremy Fitzhardinge } 2190d160211SJeremy Fitzhardinge 2200d160211SJeremy Fitzhardinge static void xennet_alloc_rx_buffers(struct net_device *dev) 2210d160211SJeremy Fitzhardinge { 2220d160211SJeremy Fitzhardinge unsigned short id; 2230d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 2240d160211SJeremy Fitzhardinge struct sk_buff *skb; 2250d160211SJeremy Fitzhardinge struct page *page; 2260d160211SJeremy Fitzhardinge int i, batch_target, notify; 2270d160211SJeremy Fitzhardinge RING_IDX req_prod = np->rx.req_prod_pvt; 2280d160211SJeremy Fitzhardinge grant_ref_t ref; 2290d160211SJeremy Fitzhardinge unsigned long pfn; 2300d160211SJeremy Fitzhardinge void *vaddr; 2310d160211SJeremy Fitzhardinge struct xen_netif_rx_request *req; 2320d160211SJeremy Fitzhardinge 2330d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev))) 2340d160211SJeremy Fitzhardinge return; 2350d160211SJeremy Fitzhardinge 2360d160211SJeremy Fitzhardinge /* 2370d160211SJeremy Fitzhardinge * Allocate skbuffs greedily, even though we batch updates to the 2380d160211SJeremy Fitzhardinge * receive ring. This creates a less bursty demand on the memory 2390d160211SJeremy Fitzhardinge * allocator, so should reduce the chance of failed allocation requests 2400d160211SJeremy Fitzhardinge * both for ourself and for other kernel subsystems. 2410d160211SJeremy Fitzhardinge */ 2420d160211SJeremy Fitzhardinge batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); 2430d160211SJeremy Fitzhardinge for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { 244617a20bbSIsaku Yamahata skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, 2450d160211SJeremy Fitzhardinge GFP_ATOMIC | __GFP_NOWARN); 2460d160211SJeremy Fitzhardinge if (unlikely(!skb)) 2470d160211SJeremy Fitzhardinge goto no_skb; 2480d160211SJeremy Fitzhardinge 249617a20bbSIsaku Yamahata /* Align ip header to a 16 bytes boundary */ 250617a20bbSIsaku Yamahata skb_reserve(skb, NET_IP_ALIGN); 251617a20bbSIsaku Yamahata 2520d160211SJeremy Fitzhardinge page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); 2530d160211SJeremy Fitzhardinge if (!page) { 2540d160211SJeremy Fitzhardinge kfree_skb(skb); 2550d160211SJeremy Fitzhardinge no_skb: 2560d160211SJeremy Fitzhardinge /* Any skbuffs queued for refill? Force them out. */ 2570d160211SJeremy Fitzhardinge if (i != 0) 2580d160211SJeremy Fitzhardinge goto refill; 2590d160211SJeremy Fitzhardinge /* Could not allocate any skbuffs. Try again later. */ 2600d160211SJeremy Fitzhardinge mod_timer(&np->rx_refill_timer, 2610d160211SJeremy Fitzhardinge jiffies + (HZ/10)); 2620d160211SJeremy Fitzhardinge break; 2630d160211SJeremy Fitzhardinge } 2640d160211SJeremy Fitzhardinge 2650d160211SJeremy Fitzhardinge skb_shinfo(skb)->frags[0].page = page; 2660d160211SJeremy Fitzhardinge skb_shinfo(skb)->nr_frags = 1; 2670d160211SJeremy Fitzhardinge __skb_queue_tail(&np->rx_batch, skb); 2680d160211SJeremy Fitzhardinge } 2690d160211SJeremy Fitzhardinge 2700d160211SJeremy Fitzhardinge /* Is the batch large enough to be worthwhile? */ 2710d160211SJeremy Fitzhardinge if (i < (np->rx_target/2)) { 2720d160211SJeremy Fitzhardinge if (req_prod > np->rx.sring->req_prod) 2730d160211SJeremy Fitzhardinge goto push; 2740d160211SJeremy Fitzhardinge return; 2750d160211SJeremy Fitzhardinge } 2760d160211SJeremy Fitzhardinge 2770d160211SJeremy Fitzhardinge /* Adjust our fill target if we risked running out of buffers. */ 2780d160211SJeremy Fitzhardinge if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && 2790d160211SJeremy Fitzhardinge ((np->rx_target *= 2) > np->rx_max_target)) 2800d160211SJeremy Fitzhardinge np->rx_target = np->rx_max_target; 2810d160211SJeremy Fitzhardinge 2820d160211SJeremy Fitzhardinge refill: 2835dcddfaeSJeremy Fitzhardinge for (i = 0; ; i++) { 2840d160211SJeremy Fitzhardinge skb = __skb_dequeue(&np->rx_batch); 2850d160211SJeremy Fitzhardinge if (skb == NULL) 2860d160211SJeremy Fitzhardinge break; 2870d160211SJeremy Fitzhardinge 2880d160211SJeremy Fitzhardinge skb->dev = dev; 2890d160211SJeremy Fitzhardinge 2900d160211SJeremy Fitzhardinge id = xennet_rxidx(req_prod + i); 2910d160211SJeremy Fitzhardinge 2920d160211SJeremy Fitzhardinge BUG_ON(np->rx_skbs[id]); 2930d160211SJeremy Fitzhardinge np->rx_skbs[id] = skb; 2940d160211SJeremy Fitzhardinge 2950d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_rx_head); 2960d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 2970d160211SJeremy Fitzhardinge np->grant_rx_ref[id] = ref; 2980d160211SJeremy Fitzhardinge 2990d160211SJeremy Fitzhardinge pfn = page_to_pfn(skb_shinfo(skb)->frags[0].page); 3000d160211SJeremy Fitzhardinge vaddr = page_address(skb_shinfo(skb)->frags[0].page); 3010d160211SJeremy Fitzhardinge 3020d160211SJeremy Fitzhardinge req = RING_GET_REQUEST(&np->rx, req_prod + i); 3030d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref(ref, 3040d160211SJeremy Fitzhardinge np->xbdev->otherend_id, 3050d160211SJeremy Fitzhardinge pfn_to_mfn(pfn), 3060d160211SJeremy Fitzhardinge 0); 3070d160211SJeremy Fitzhardinge 3080d160211SJeremy Fitzhardinge req->id = id; 3090d160211SJeremy Fitzhardinge req->gref = ref; 3100d160211SJeremy Fitzhardinge } 3110d160211SJeremy Fitzhardinge 3120d160211SJeremy Fitzhardinge wmb(); /* barrier so backend seens requests */ 3130d160211SJeremy Fitzhardinge 3140d160211SJeremy Fitzhardinge /* Above is a suitable barrier to ensure backend will see requests. */ 3150d160211SJeremy Fitzhardinge np->rx.req_prod_pvt = req_prod + i; 3160d160211SJeremy Fitzhardinge push: 3170d160211SJeremy Fitzhardinge RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); 3180d160211SJeremy Fitzhardinge if (notify) 3190d160211SJeremy Fitzhardinge notify_remote_via_irq(np->netdev->irq); 3200d160211SJeremy Fitzhardinge } 3210d160211SJeremy Fitzhardinge 3220d160211SJeremy Fitzhardinge static int xennet_open(struct net_device *dev) 3230d160211SJeremy Fitzhardinge { 3240d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3250d160211SJeremy Fitzhardinge 326bea3348eSStephen Hemminger napi_enable(&np->napi); 327bea3348eSStephen Hemminger 3280d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 3290d160211SJeremy Fitzhardinge if (netif_carrier_ok(dev)) { 3300d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(dev); 3310d160211SJeremy Fitzhardinge np->rx.sring->rsp_event = np->rx.rsp_cons + 1; 3320d160211SJeremy Fitzhardinge if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) 333288379f0SBen Hutchings napi_schedule(&np->napi); 3340d160211SJeremy Fitzhardinge } 3350d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 3360d160211SJeremy Fitzhardinge 3370b1ab1b8SEduardo Habkost netif_start_queue(dev); 3380d160211SJeremy Fitzhardinge 3390d160211SJeremy Fitzhardinge return 0; 3400d160211SJeremy Fitzhardinge } 3410d160211SJeremy Fitzhardinge 3420d160211SJeremy Fitzhardinge static void xennet_tx_buf_gc(struct net_device *dev) 3430d160211SJeremy Fitzhardinge { 3440d160211SJeremy Fitzhardinge RING_IDX cons, prod; 3450d160211SJeremy Fitzhardinge unsigned short id; 3460d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 3470d160211SJeremy Fitzhardinge struct sk_buff *skb; 3480d160211SJeremy Fitzhardinge 3490d160211SJeremy Fitzhardinge BUG_ON(!netif_carrier_ok(dev)); 3500d160211SJeremy Fitzhardinge 3510d160211SJeremy Fitzhardinge do { 3520d160211SJeremy Fitzhardinge prod = np->tx.sring->rsp_prod; 3530d160211SJeremy Fitzhardinge rmb(); /* Ensure we see responses up to 'rp'. */ 3540d160211SJeremy Fitzhardinge 3550d160211SJeremy Fitzhardinge for (cons = np->tx.rsp_cons; cons != prod; cons++) { 3560d160211SJeremy Fitzhardinge struct xen_netif_tx_response *txrsp; 3570d160211SJeremy Fitzhardinge 3580d160211SJeremy Fitzhardinge txrsp = RING_GET_RESPONSE(&np->tx, cons); 3590d160211SJeremy Fitzhardinge if (txrsp->status == NETIF_RSP_NULL) 3600d160211SJeremy Fitzhardinge continue; 3610d160211SJeremy Fitzhardinge 3620d160211SJeremy Fitzhardinge id = txrsp->id; 3630d160211SJeremy Fitzhardinge skb = np->tx_skbs[id].skb; 3640d160211SJeremy Fitzhardinge if (unlikely(gnttab_query_foreign_access( 3650d160211SJeremy Fitzhardinge np->grant_tx_ref[id]) != 0)) { 3660d160211SJeremy Fitzhardinge printk(KERN_ALERT "xennet_tx_buf_gc: warning " 3670d160211SJeremy Fitzhardinge "-- grant still in use by backend " 3680d160211SJeremy Fitzhardinge "domain.\n"); 3690d160211SJeremy Fitzhardinge BUG(); 3700d160211SJeremy Fitzhardinge } 3710d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref( 3720d160211SJeremy Fitzhardinge np->grant_tx_ref[id], GNTMAP_readonly); 3730d160211SJeremy Fitzhardinge gnttab_release_grant_reference( 3740d160211SJeremy Fitzhardinge &np->gref_tx_head, np->grant_tx_ref[id]); 3750d160211SJeremy Fitzhardinge np->grant_tx_ref[id] = GRANT_INVALID_REF; 3760d160211SJeremy Fitzhardinge add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); 3770d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 3780d160211SJeremy Fitzhardinge } 3790d160211SJeremy Fitzhardinge 3800d160211SJeremy Fitzhardinge np->tx.rsp_cons = prod; 3810d160211SJeremy Fitzhardinge 3820d160211SJeremy Fitzhardinge /* 3830d160211SJeremy Fitzhardinge * Set a new event, then check for race with update of tx_cons. 3840d160211SJeremy Fitzhardinge * Note that it is essential to schedule a callback, no matter 3850d160211SJeremy Fitzhardinge * how few buffers are pending. Even if there is space in the 3860d160211SJeremy Fitzhardinge * transmit ring, higher layers may be blocked because too much 3870d160211SJeremy Fitzhardinge * data is outstanding: in such cases notification from Xen is 3880d160211SJeremy Fitzhardinge * likely to be the only kick that we'll get. 3890d160211SJeremy Fitzhardinge */ 3900d160211SJeremy Fitzhardinge np->tx.sring->rsp_event = 3910d160211SJeremy Fitzhardinge prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; 3920d160211SJeremy Fitzhardinge mb(); /* update shared area */ 3930d160211SJeremy Fitzhardinge } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); 3940d160211SJeremy Fitzhardinge 3950d160211SJeremy Fitzhardinge xennet_maybe_wake_tx(dev); 3960d160211SJeremy Fitzhardinge } 3970d160211SJeremy Fitzhardinge 3980d160211SJeremy Fitzhardinge static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, 3990d160211SJeremy Fitzhardinge struct xen_netif_tx_request *tx) 4000d160211SJeremy Fitzhardinge { 4010d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 4020d160211SJeremy Fitzhardinge char *data = skb->data; 4030d160211SJeremy Fitzhardinge unsigned long mfn; 4040d160211SJeremy Fitzhardinge RING_IDX prod = np->tx.req_prod_pvt; 4050d160211SJeremy Fitzhardinge int frags = skb_shinfo(skb)->nr_frags; 4060d160211SJeremy Fitzhardinge unsigned int offset = offset_in_page(data); 4070d160211SJeremy Fitzhardinge unsigned int len = skb_headlen(skb); 4080d160211SJeremy Fitzhardinge unsigned int id; 4090d160211SJeremy Fitzhardinge grant_ref_t ref; 4100d160211SJeremy Fitzhardinge int i; 4110d160211SJeremy Fitzhardinge 4120d160211SJeremy Fitzhardinge /* While the header overlaps a page boundary (including being 4130d160211SJeremy Fitzhardinge larger than a page), split it it into page-sized chunks. */ 4140d160211SJeremy Fitzhardinge while (len > PAGE_SIZE - offset) { 4150d160211SJeremy Fitzhardinge tx->size = PAGE_SIZE - offset; 4160d160211SJeremy Fitzhardinge tx->flags |= NETTXF_more_data; 4170d160211SJeremy Fitzhardinge len -= tx->size; 4180d160211SJeremy Fitzhardinge data += tx->size; 4190d160211SJeremy Fitzhardinge offset = 0; 4200d160211SJeremy Fitzhardinge 4210d160211SJeremy Fitzhardinge id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); 4220d160211SJeremy Fitzhardinge np->tx_skbs[id].skb = skb_get(skb); 4230d160211SJeremy Fitzhardinge tx = RING_GET_REQUEST(&np->tx, prod++); 4240d160211SJeremy Fitzhardinge tx->id = id; 4250d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_tx_head); 4260d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 4270d160211SJeremy Fitzhardinge 4280d160211SJeremy Fitzhardinge mfn = virt_to_mfn(data); 4290d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, 4300d160211SJeremy Fitzhardinge mfn, GNTMAP_readonly); 4310d160211SJeremy Fitzhardinge 4320d160211SJeremy Fitzhardinge tx->gref = np->grant_tx_ref[id] = ref; 4330d160211SJeremy Fitzhardinge tx->offset = offset; 4340d160211SJeremy Fitzhardinge tx->size = len; 4350d160211SJeremy Fitzhardinge tx->flags = 0; 4360d160211SJeremy Fitzhardinge } 4370d160211SJeremy Fitzhardinge 4380d160211SJeremy Fitzhardinge /* Grant backend access to each skb fragment page. */ 4390d160211SJeremy Fitzhardinge for (i = 0; i < frags; i++) { 4400d160211SJeremy Fitzhardinge skb_frag_t *frag = skb_shinfo(skb)->frags + i; 4410d160211SJeremy Fitzhardinge 4420d160211SJeremy Fitzhardinge tx->flags |= NETTXF_more_data; 4430d160211SJeremy Fitzhardinge 4440d160211SJeremy Fitzhardinge id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); 4450d160211SJeremy Fitzhardinge np->tx_skbs[id].skb = skb_get(skb); 4460d160211SJeremy Fitzhardinge tx = RING_GET_REQUEST(&np->tx, prod++); 4470d160211SJeremy Fitzhardinge tx->id = id; 4480d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_tx_head); 4490d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 4500d160211SJeremy Fitzhardinge 4510d160211SJeremy Fitzhardinge mfn = pfn_to_mfn(page_to_pfn(frag->page)); 4520d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, 4530d160211SJeremy Fitzhardinge mfn, GNTMAP_readonly); 4540d160211SJeremy Fitzhardinge 4550d160211SJeremy Fitzhardinge tx->gref = np->grant_tx_ref[id] = ref; 4560d160211SJeremy Fitzhardinge tx->offset = frag->page_offset; 4570d160211SJeremy Fitzhardinge tx->size = frag->size; 4580d160211SJeremy Fitzhardinge tx->flags = 0; 4590d160211SJeremy Fitzhardinge } 4600d160211SJeremy Fitzhardinge 4610d160211SJeremy Fitzhardinge np->tx.req_prod_pvt = prod; 4620d160211SJeremy Fitzhardinge } 4630d160211SJeremy Fitzhardinge 4640d160211SJeremy Fitzhardinge static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) 4650d160211SJeremy Fitzhardinge { 4660d160211SJeremy Fitzhardinge unsigned short id; 4670d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 4680d160211SJeremy Fitzhardinge struct xen_netif_tx_request *tx; 4690d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 4700d160211SJeremy Fitzhardinge char *data = skb->data; 4710d160211SJeremy Fitzhardinge RING_IDX i; 4720d160211SJeremy Fitzhardinge grant_ref_t ref; 4730d160211SJeremy Fitzhardinge unsigned long mfn; 4740d160211SJeremy Fitzhardinge int notify; 4750d160211SJeremy Fitzhardinge int frags = skb_shinfo(skb)->nr_frags; 4760d160211SJeremy Fitzhardinge unsigned int offset = offset_in_page(data); 4770d160211SJeremy Fitzhardinge unsigned int len = skb_headlen(skb); 4780d160211SJeremy Fitzhardinge 47943526370SJulia Lawall frags += DIV_ROUND_UP(offset + len, PAGE_SIZE); 4800d160211SJeremy Fitzhardinge if (unlikely(frags > MAX_SKB_FRAGS + 1)) { 4810d160211SJeremy Fitzhardinge printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", 4820d160211SJeremy Fitzhardinge frags); 4830d160211SJeremy Fitzhardinge dump_stack(); 4840d160211SJeremy Fitzhardinge goto drop; 4850d160211SJeremy Fitzhardinge } 4860d160211SJeremy Fitzhardinge 4870d160211SJeremy Fitzhardinge spin_lock_irq(&np->tx_lock); 4880d160211SJeremy Fitzhardinge 4890d160211SJeremy Fitzhardinge if (unlikely(!netif_carrier_ok(dev) || 4900d160211SJeremy Fitzhardinge (frags > 1 && !xennet_can_sg(dev)) || 491fc741216SJesse Gross netif_needs_gso(skb, netif_skb_features(skb)))) { 4920d160211SJeremy Fitzhardinge spin_unlock_irq(&np->tx_lock); 4930d160211SJeremy Fitzhardinge goto drop; 4940d160211SJeremy Fitzhardinge } 4950d160211SJeremy Fitzhardinge 4960d160211SJeremy Fitzhardinge i = np->tx.req_prod_pvt; 4970d160211SJeremy Fitzhardinge 4980d160211SJeremy Fitzhardinge id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); 4990d160211SJeremy Fitzhardinge np->tx_skbs[id].skb = skb; 5000d160211SJeremy Fitzhardinge 5010d160211SJeremy Fitzhardinge tx = RING_GET_REQUEST(&np->tx, i); 5020d160211SJeremy Fitzhardinge 5030d160211SJeremy Fitzhardinge tx->id = id; 5040d160211SJeremy Fitzhardinge ref = gnttab_claim_grant_reference(&np->gref_tx_head); 5050d160211SJeremy Fitzhardinge BUG_ON((signed short)ref < 0); 5060d160211SJeremy Fitzhardinge mfn = virt_to_mfn(data); 5070d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref( 5080d160211SJeremy Fitzhardinge ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); 5090d160211SJeremy Fitzhardinge tx->gref = np->grant_tx_ref[id] = ref; 5100d160211SJeremy Fitzhardinge tx->offset = offset; 5110d160211SJeremy Fitzhardinge tx->size = len; 5120d160211SJeremy Fitzhardinge extra = NULL; 5130d160211SJeremy Fitzhardinge 5140d160211SJeremy Fitzhardinge tx->flags = 0; 5150d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) 5160d160211SJeremy Fitzhardinge /* local packet? */ 5170d160211SJeremy Fitzhardinge tx->flags |= NETTXF_csum_blank | NETTXF_data_validated; 5180d160211SJeremy Fitzhardinge else if (skb->ip_summed == CHECKSUM_UNNECESSARY) 5190d160211SJeremy Fitzhardinge /* remote but checksummed. */ 5200d160211SJeremy Fitzhardinge tx->flags |= NETTXF_data_validated; 5210d160211SJeremy Fitzhardinge 5220d160211SJeremy Fitzhardinge if (skb_shinfo(skb)->gso_size) { 5230d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 5240d160211SJeremy Fitzhardinge 5250d160211SJeremy Fitzhardinge gso = (struct xen_netif_extra_info *) 5260d160211SJeremy Fitzhardinge RING_GET_REQUEST(&np->tx, ++i); 5270d160211SJeremy Fitzhardinge 5280d160211SJeremy Fitzhardinge if (extra) 5290d160211SJeremy Fitzhardinge extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; 5300d160211SJeremy Fitzhardinge else 5310d160211SJeremy Fitzhardinge tx->flags |= NETTXF_extra_info; 5320d160211SJeremy Fitzhardinge 5330d160211SJeremy Fitzhardinge gso->u.gso.size = skb_shinfo(skb)->gso_size; 5340d160211SJeremy Fitzhardinge gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; 5350d160211SJeremy Fitzhardinge gso->u.gso.pad = 0; 5360d160211SJeremy Fitzhardinge gso->u.gso.features = 0; 5370d160211SJeremy Fitzhardinge 5380d160211SJeremy Fitzhardinge gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 5390d160211SJeremy Fitzhardinge gso->flags = 0; 5400d160211SJeremy Fitzhardinge extra = gso; 5410d160211SJeremy Fitzhardinge } 5420d160211SJeremy Fitzhardinge 5430d160211SJeremy Fitzhardinge np->tx.req_prod_pvt = i + 1; 5440d160211SJeremy Fitzhardinge 5450d160211SJeremy Fitzhardinge xennet_make_frags(skb, dev, tx); 5460d160211SJeremy Fitzhardinge tx->size = skb->len; 5470d160211SJeremy Fitzhardinge 5480d160211SJeremy Fitzhardinge RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); 5490d160211SJeremy Fitzhardinge if (notify) 5500d160211SJeremy Fitzhardinge notify_remote_via_irq(np->netdev->irq); 5510d160211SJeremy Fitzhardinge 55209f75cd7SJeff Garzik dev->stats.tx_bytes += skb->len; 55309f75cd7SJeff Garzik dev->stats.tx_packets++; 55410a273a6SJeremy Fitzhardinge 55510a273a6SJeremy Fitzhardinge /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ 5560d160211SJeremy Fitzhardinge xennet_tx_buf_gc(dev); 5570d160211SJeremy Fitzhardinge 5580d160211SJeremy Fitzhardinge if (!netfront_tx_slot_available(np)) 5590d160211SJeremy Fitzhardinge netif_stop_queue(dev); 5600d160211SJeremy Fitzhardinge 5610d160211SJeremy Fitzhardinge spin_unlock_irq(&np->tx_lock); 5620d160211SJeremy Fitzhardinge 5636ed10654SPatrick McHardy return NETDEV_TX_OK; 5640d160211SJeremy Fitzhardinge 5650d160211SJeremy Fitzhardinge drop: 56609f75cd7SJeff Garzik dev->stats.tx_dropped++; 5670d160211SJeremy Fitzhardinge dev_kfree_skb(skb); 5686ed10654SPatrick McHardy return NETDEV_TX_OK; 5690d160211SJeremy Fitzhardinge } 5700d160211SJeremy Fitzhardinge 5710d160211SJeremy Fitzhardinge static int xennet_close(struct net_device *dev) 5720d160211SJeremy Fitzhardinge { 5730d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 5740d160211SJeremy Fitzhardinge netif_stop_queue(np->netdev); 575bea3348eSStephen Hemminger napi_disable(&np->napi); 5760d160211SJeremy Fitzhardinge return 0; 5770d160211SJeremy Fitzhardinge } 5780d160211SJeremy Fitzhardinge 5790d160211SJeremy Fitzhardinge static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, 5800d160211SJeremy Fitzhardinge grant_ref_t ref) 5810d160211SJeremy Fitzhardinge { 5820d160211SJeremy Fitzhardinge int new = xennet_rxidx(np->rx.req_prod_pvt); 5830d160211SJeremy Fitzhardinge 5840d160211SJeremy Fitzhardinge BUG_ON(np->rx_skbs[new]); 5850d160211SJeremy Fitzhardinge np->rx_skbs[new] = skb; 5860d160211SJeremy Fitzhardinge np->grant_rx_ref[new] = ref; 5870d160211SJeremy Fitzhardinge RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; 5880d160211SJeremy Fitzhardinge RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; 5890d160211SJeremy Fitzhardinge np->rx.req_prod_pvt++; 5900d160211SJeremy Fitzhardinge } 5910d160211SJeremy Fitzhardinge 5920d160211SJeremy Fitzhardinge static int xennet_get_extras(struct netfront_info *np, 5930d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras, 5940d160211SJeremy Fitzhardinge RING_IDX rp) 5950d160211SJeremy Fitzhardinge 5960d160211SJeremy Fitzhardinge { 5970d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extra; 5980d160211SJeremy Fitzhardinge struct device *dev = &np->netdev->dev; 5990d160211SJeremy Fitzhardinge RING_IDX cons = np->rx.rsp_cons; 6000d160211SJeremy Fitzhardinge int err = 0; 6010d160211SJeremy Fitzhardinge 6020d160211SJeremy Fitzhardinge do { 6030d160211SJeremy Fitzhardinge struct sk_buff *skb; 6040d160211SJeremy Fitzhardinge grant_ref_t ref; 6050d160211SJeremy Fitzhardinge 6060d160211SJeremy Fitzhardinge if (unlikely(cons + 1 == rp)) { 6070d160211SJeremy Fitzhardinge if (net_ratelimit()) 6080d160211SJeremy Fitzhardinge dev_warn(dev, "Missing extra info\n"); 6090d160211SJeremy Fitzhardinge err = -EBADR; 6100d160211SJeremy Fitzhardinge break; 6110d160211SJeremy Fitzhardinge } 6120d160211SJeremy Fitzhardinge 6130d160211SJeremy Fitzhardinge extra = (struct xen_netif_extra_info *) 6140d160211SJeremy Fitzhardinge RING_GET_RESPONSE(&np->rx, ++cons); 6150d160211SJeremy Fitzhardinge 6160d160211SJeremy Fitzhardinge if (unlikely(!extra->type || 6170d160211SJeremy Fitzhardinge extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 6180d160211SJeremy Fitzhardinge if (net_ratelimit()) 6190d160211SJeremy Fitzhardinge dev_warn(dev, "Invalid extra type: %d\n", 6200d160211SJeremy Fitzhardinge extra->type); 6210d160211SJeremy Fitzhardinge err = -EINVAL; 6220d160211SJeremy Fitzhardinge } else { 6230d160211SJeremy Fitzhardinge memcpy(&extras[extra->type - 1], extra, 6240d160211SJeremy Fitzhardinge sizeof(*extra)); 6250d160211SJeremy Fitzhardinge } 6260d160211SJeremy Fitzhardinge 6270d160211SJeremy Fitzhardinge skb = xennet_get_rx_skb(np, cons); 6280d160211SJeremy Fitzhardinge ref = xennet_get_rx_ref(np, cons); 6290d160211SJeremy Fitzhardinge xennet_move_rx_slot(np, skb, ref); 6300d160211SJeremy Fitzhardinge } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 6310d160211SJeremy Fitzhardinge 6320d160211SJeremy Fitzhardinge np->rx.rsp_cons = cons; 6330d160211SJeremy Fitzhardinge return err; 6340d160211SJeremy Fitzhardinge } 6350d160211SJeremy Fitzhardinge 6360d160211SJeremy Fitzhardinge static int xennet_get_responses(struct netfront_info *np, 6370d160211SJeremy Fitzhardinge struct netfront_rx_info *rinfo, RING_IDX rp, 6380d160211SJeremy Fitzhardinge struct sk_buff_head *list) 6390d160211SJeremy Fitzhardinge { 6400d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo->rx; 6410d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo->extras; 6420d160211SJeremy Fitzhardinge struct device *dev = &np->netdev->dev; 6430d160211SJeremy Fitzhardinge RING_IDX cons = np->rx.rsp_cons; 6440d160211SJeremy Fitzhardinge struct sk_buff *skb = xennet_get_rx_skb(np, cons); 6450d160211SJeremy Fitzhardinge grant_ref_t ref = xennet_get_rx_ref(np, cons); 6460d160211SJeremy Fitzhardinge int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); 6470d160211SJeremy Fitzhardinge int frags = 1; 6480d160211SJeremy Fitzhardinge int err = 0; 6490d160211SJeremy Fitzhardinge unsigned long ret; 6500d160211SJeremy Fitzhardinge 6510d160211SJeremy Fitzhardinge if (rx->flags & NETRXF_extra_info) { 6520d160211SJeremy Fitzhardinge err = xennet_get_extras(np, extras, rp); 6530d160211SJeremy Fitzhardinge cons = np->rx.rsp_cons; 6540d160211SJeremy Fitzhardinge } 6550d160211SJeremy Fitzhardinge 6560d160211SJeremy Fitzhardinge for (;;) { 6570d160211SJeremy Fitzhardinge if (unlikely(rx->status < 0 || 6580d160211SJeremy Fitzhardinge rx->offset + rx->status > PAGE_SIZE)) { 6590d160211SJeremy Fitzhardinge if (net_ratelimit()) 6600d160211SJeremy Fitzhardinge dev_warn(dev, "rx->offset: %x, size: %u\n", 6610d160211SJeremy Fitzhardinge rx->offset, rx->status); 6620d160211SJeremy Fitzhardinge xennet_move_rx_slot(np, skb, ref); 6630d160211SJeremy Fitzhardinge err = -EINVAL; 6640d160211SJeremy Fitzhardinge goto next; 6650d160211SJeremy Fitzhardinge } 6660d160211SJeremy Fitzhardinge 6670d160211SJeremy Fitzhardinge /* 6680d160211SJeremy Fitzhardinge * This definitely indicates a bug, either in this driver or in 6690d160211SJeremy Fitzhardinge * the backend driver. In future this should flag the bad 6700d160211SJeremy Fitzhardinge * situation to the system controller to reboot the backed. 6710d160211SJeremy Fitzhardinge */ 6720d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 6730d160211SJeremy Fitzhardinge if (net_ratelimit()) 6740d160211SJeremy Fitzhardinge dev_warn(dev, "Bad rx response id %d.\n", 6750d160211SJeremy Fitzhardinge rx->id); 6760d160211SJeremy Fitzhardinge err = -EINVAL; 6770d160211SJeremy Fitzhardinge goto next; 6780d160211SJeremy Fitzhardinge } 6790d160211SJeremy Fitzhardinge 6800d160211SJeremy Fitzhardinge ret = gnttab_end_foreign_access_ref(ref, 0); 6810d160211SJeremy Fitzhardinge BUG_ON(!ret); 6820d160211SJeremy Fitzhardinge 6830d160211SJeremy Fitzhardinge gnttab_release_grant_reference(&np->gref_rx_head, ref); 6840d160211SJeremy Fitzhardinge 6850d160211SJeremy Fitzhardinge __skb_queue_tail(list, skb); 6860d160211SJeremy Fitzhardinge 6870d160211SJeremy Fitzhardinge next: 6880d160211SJeremy Fitzhardinge if (!(rx->flags & NETRXF_more_data)) 6890d160211SJeremy Fitzhardinge break; 6900d160211SJeremy Fitzhardinge 6910d160211SJeremy Fitzhardinge if (cons + frags == rp) { 6920d160211SJeremy Fitzhardinge if (net_ratelimit()) 6930d160211SJeremy Fitzhardinge dev_warn(dev, "Need more frags\n"); 6940d160211SJeremy Fitzhardinge err = -ENOENT; 6950d160211SJeremy Fitzhardinge break; 6960d160211SJeremy Fitzhardinge } 6970d160211SJeremy Fitzhardinge 6980d160211SJeremy Fitzhardinge rx = RING_GET_RESPONSE(&np->rx, cons + frags); 6990d160211SJeremy Fitzhardinge skb = xennet_get_rx_skb(np, cons + frags); 7000d160211SJeremy Fitzhardinge ref = xennet_get_rx_ref(np, cons + frags); 7010d160211SJeremy Fitzhardinge frags++; 7020d160211SJeremy Fitzhardinge } 7030d160211SJeremy Fitzhardinge 7040d160211SJeremy Fitzhardinge if (unlikely(frags > max)) { 7050d160211SJeremy Fitzhardinge if (net_ratelimit()) 7060d160211SJeremy Fitzhardinge dev_warn(dev, "Too many frags\n"); 7070d160211SJeremy Fitzhardinge err = -E2BIG; 7080d160211SJeremy Fitzhardinge } 7090d160211SJeremy Fitzhardinge 7100d160211SJeremy Fitzhardinge if (unlikely(err)) 7110d160211SJeremy Fitzhardinge np->rx.rsp_cons = cons + frags; 7120d160211SJeremy Fitzhardinge 7130d160211SJeremy Fitzhardinge return err; 7140d160211SJeremy Fitzhardinge } 7150d160211SJeremy Fitzhardinge 7160d160211SJeremy Fitzhardinge static int xennet_set_skb_gso(struct sk_buff *skb, 7170d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso) 7180d160211SJeremy Fitzhardinge { 7190d160211SJeremy Fitzhardinge if (!gso->u.gso.size) { 7200d160211SJeremy Fitzhardinge if (net_ratelimit()) 7210d160211SJeremy Fitzhardinge printk(KERN_WARNING "GSO size must not be zero.\n"); 7220d160211SJeremy Fitzhardinge return -EINVAL; 7230d160211SJeremy Fitzhardinge } 7240d160211SJeremy Fitzhardinge 7250d160211SJeremy Fitzhardinge /* Currently only TCPv4 S.O. is supported. */ 7260d160211SJeremy Fitzhardinge if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { 7270d160211SJeremy Fitzhardinge if (net_ratelimit()) 7280d160211SJeremy Fitzhardinge printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); 7290d160211SJeremy Fitzhardinge return -EINVAL; 7300d160211SJeremy Fitzhardinge } 7310d160211SJeremy Fitzhardinge 7320d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_size = gso->u.gso.size; 7330d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 7340d160211SJeremy Fitzhardinge 7350d160211SJeremy Fitzhardinge /* Header must be checked, and gso_segs computed. */ 7360d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 7370d160211SJeremy Fitzhardinge skb_shinfo(skb)->gso_segs = 0; 7380d160211SJeremy Fitzhardinge 7390d160211SJeremy Fitzhardinge return 0; 7400d160211SJeremy Fitzhardinge } 7410d160211SJeremy Fitzhardinge 7420d160211SJeremy Fitzhardinge static RING_IDX xennet_fill_frags(struct netfront_info *np, 7430d160211SJeremy Fitzhardinge struct sk_buff *skb, 7440d160211SJeremy Fitzhardinge struct sk_buff_head *list) 7450d160211SJeremy Fitzhardinge { 7460d160211SJeremy Fitzhardinge struct skb_shared_info *shinfo = skb_shinfo(skb); 7470d160211SJeremy Fitzhardinge int nr_frags = shinfo->nr_frags; 7480d160211SJeremy Fitzhardinge RING_IDX cons = np->rx.rsp_cons; 7490d160211SJeremy Fitzhardinge skb_frag_t *frag = shinfo->frags + nr_frags; 7500d160211SJeremy Fitzhardinge struct sk_buff *nskb; 7510d160211SJeremy Fitzhardinge 7520d160211SJeremy Fitzhardinge while ((nskb = __skb_dequeue(list))) { 7530d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = 7540d160211SJeremy Fitzhardinge RING_GET_RESPONSE(&np->rx, ++cons); 7550d160211SJeremy Fitzhardinge 7560d160211SJeremy Fitzhardinge frag->page = skb_shinfo(nskb)->frags[0].page; 7570d160211SJeremy Fitzhardinge frag->page_offset = rx->offset; 7580d160211SJeremy Fitzhardinge frag->size = rx->status; 7590d160211SJeremy Fitzhardinge 7600d160211SJeremy Fitzhardinge skb->data_len += rx->status; 7610d160211SJeremy Fitzhardinge 7620d160211SJeremy Fitzhardinge skb_shinfo(nskb)->nr_frags = 0; 7630d160211SJeremy Fitzhardinge kfree_skb(nskb); 7640d160211SJeremy Fitzhardinge 7650d160211SJeremy Fitzhardinge frag++; 7660d160211SJeremy Fitzhardinge nr_frags++; 7670d160211SJeremy Fitzhardinge } 7680d160211SJeremy Fitzhardinge 7690d160211SJeremy Fitzhardinge shinfo->nr_frags = nr_frags; 7700d160211SJeremy Fitzhardinge return cons; 7710d160211SJeremy Fitzhardinge } 7720d160211SJeremy Fitzhardinge 7730d160211SJeremy Fitzhardinge static int skb_checksum_setup(struct sk_buff *skb) 7740d160211SJeremy Fitzhardinge { 7750d160211SJeremy Fitzhardinge struct iphdr *iph; 7760d160211SJeremy Fitzhardinge unsigned char *th; 7770d160211SJeremy Fitzhardinge int err = -EPROTO; 7780d160211SJeremy Fitzhardinge 7790d160211SJeremy Fitzhardinge if (skb->protocol != htons(ETH_P_IP)) 7800d160211SJeremy Fitzhardinge goto out; 7810d160211SJeremy Fitzhardinge 7820d160211SJeremy Fitzhardinge iph = (void *)skb->data; 7830d160211SJeremy Fitzhardinge th = skb->data + 4 * iph->ihl; 7840d160211SJeremy Fitzhardinge if (th >= skb_tail_pointer(skb)) 7850d160211SJeremy Fitzhardinge goto out; 7860d160211SJeremy Fitzhardinge 7870d160211SJeremy Fitzhardinge skb->csum_start = th - skb->head; 7880d160211SJeremy Fitzhardinge switch (iph->protocol) { 7890d160211SJeremy Fitzhardinge case IPPROTO_TCP: 7900d160211SJeremy Fitzhardinge skb->csum_offset = offsetof(struct tcphdr, check); 7910d160211SJeremy Fitzhardinge break; 7920d160211SJeremy Fitzhardinge case IPPROTO_UDP: 7930d160211SJeremy Fitzhardinge skb->csum_offset = offsetof(struct udphdr, check); 7940d160211SJeremy Fitzhardinge break; 7950d160211SJeremy Fitzhardinge default: 7960d160211SJeremy Fitzhardinge if (net_ratelimit()) 7970d160211SJeremy Fitzhardinge printk(KERN_ERR "Attempting to checksum a non-" 7980d160211SJeremy Fitzhardinge "TCP/UDP packet, dropping a protocol" 7990d160211SJeremy Fitzhardinge " %d packet", iph->protocol); 8000d160211SJeremy Fitzhardinge goto out; 8010d160211SJeremy Fitzhardinge } 8020d160211SJeremy Fitzhardinge 8030d160211SJeremy Fitzhardinge if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) 8040d160211SJeremy Fitzhardinge goto out; 8050d160211SJeremy Fitzhardinge 8060d160211SJeremy Fitzhardinge err = 0; 8070d160211SJeremy Fitzhardinge 8080d160211SJeremy Fitzhardinge out: 8090d160211SJeremy Fitzhardinge return err; 8100d160211SJeremy Fitzhardinge } 8110d160211SJeremy Fitzhardinge 8120d160211SJeremy Fitzhardinge static int handle_incoming_queue(struct net_device *dev, 8130d160211SJeremy Fitzhardinge struct sk_buff_head *rxq) 8140d160211SJeremy Fitzhardinge { 8150d160211SJeremy Fitzhardinge int packets_dropped = 0; 8160d160211SJeremy Fitzhardinge struct sk_buff *skb; 8170d160211SJeremy Fitzhardinge 8180d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(rxq)) != NULL) { 8190d160211SJeremy Fitzhardinge struct page *page = NETFRONT_SKB_CB(skb)->page; 8200d160211SJeremy Fitzhardinge void *vaddr = page_address(page); 8210d160211SJeremy Fitzhardinge unsigned offset = NETFRONT_SKB_CB(skb)->offset; 8220d160211SJeremy Fitzhardinge 8230d160211SJeremy Fitzhardinge memcpy(skb->data, vaddr + offset, 8240d160211SJeremy Fitzhardinge skb_headlen(skb)); 8250d160211SJeremy Fitzhardinge 8260d160211SJeremy Fitzhardinge if (page != skb_shinfo(skb)->frags[0].page) 8270d160211SJeremy Fitzhardinge __free_page(page); 8280d160211SJeremy Fitzhardinge 8290d160211SJeremy Fitzhardinge /* Ethernet work: Delayed to here as it peeks the header. */ 8300d160211SJeremy Fitzhardinge skb->protocol = eth_type_trans(skb, dev); 8310d160211SJeremy Fitzhardinge 8320d160211SJeremy Fitzhardinge if (skb->ip_summed == CHECKSUM_PARTIAL) { 8330d160211SJeremy Fitzhardinge if (skb_checksum_setup(skb)) { 8340d160211SJeremy Fitzhardinge kfree_skb(skb); 8350d160211SJeremy Fitzhardinge packets_dropped++; 83609f75cd7SJeff Garzik dev->stats.rx_errors++; 8370d160211SJeremy Fitzhardinge continue; 8380d160211SJeremy Fitzhardinge } 8390d160211SJeremy Fitzhardinge } 8400d160211SJeremy Fitzhardinge 84109f75cd7SJeff Garzik dev->stats.rx_packets++; 84209f75cd7SJeff Garzik dev->stats.rx_bytes += skb->len; 8430d160211SJeremy Fitzhardinge 8440d160211SJeremy Fitzhardinge /* Pass it up. */ 8450d160211SJeremy Fitzhardinge netif_receive_skb(skb); 8460d160211SJeremy Fitzhardinge } 8470d160211SJeremy Fitzhardinge 8480d160211SJeremy Fitzhardinge return packets_dropped; 8490d160211SJeremy Fitzhardinge } 8500d160211SJeremy Fitzhardinge 851bea3348eSStephen Hemminger static int xennet_poll(struct napi_struct *napi, int budget) 8520d160211SJeremy Fitzhardinge { 853bea3348eSStephen Hemminger struct netfront_info *np = container_of(napi, struct netfront_info, napi); 854bea3348eSStephen Hemminger struct net_device *dev = np->netdev; 8550d160211SJeremy Fitzhardinge struct sk_buff *skb; 8560d160211SJeremy Fitzhardinge struct netfront_rx_info rinfo; 8570d160211SJeremy Fitzhardinge struct xen_netif_rx_response *rx = &rinfo.rx; 8580d160211SJeremy Fitzhardinge struct xen_netif_extra_info *extras = rinfo.extras; 8590d160211SJeremy Fitzhardinge RING_IDX i, rp; 860bea3348eSStephen Hemminger int work_done; 8610d160211SJeremy Fitzhardinge struct sk_buff_head rxq; 8620d160211SJeremy Fitzhardinge struct sk_buff_head errq; 8630d160211SJeremy Fitzhardinge struct sk_buff_head tmpq; 8640d160211SJeremy Fitzhardinge unsigned long flags; 8650d160211SJeremy Fitzhardinge unsigned int len; 8660d160211SJeremy Fitzhardinge int err; 8670d160211SJeremy Fitzhardinge 8680d160211SJeremy Fitzhardinge spin_lock(&np->rx_lock); 8690d160211SJeremy Fitzhardinge 8700d160211SJeremy Fitzhardinge skb_queue_head_init(&rxq); 8710d160211SJeremy Fitzhardinge skb_queue_head_init(&errq); 8720d160211SJeremy Fitzhardinge skb_queue_head_init(&tmpq); 8730d160211SJeremy Fitzhardinge 8740d160211SJeremy Fitzhardinge rp = np->rx.sring->rsp_prod; 8750d160211SJeremy Fitzhardinge rmb(); /* Ensure we see queued responses up to 'rp'. */ 8760d160211SJeremy Fitzhardinge 8770d160211SJeremy Fitzhardinge i = np->rx.rsp_cons; 8780d160211SJeremy Fitzhardinge work_done = 0; 8790d160211SJeremy Fitzhardinge while ((i != rp) && (work_done < budget)) { 8800d160211SJeremy Fitzhardinge memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); 8810d160211SJeremy Fitzhardinge memset(extras, 0, sizeof(rinfo.extras)); 8820d160211SJeremy Fitzhardinge 8830d160211SJeremy Fitzhardinge err = xennet_get_responses(np, &rinfo, rp, &tmpq); 8840d160211SJeremy Fitzhardinge 8850d160211SJeremy Fitzhardinge if (unlikely(err)) { 8860d160211SJeremy Fitzhardinge err: 8870d160211SJeremy Fitzhardinge while ((skb = __skb_dequeue(&tmpq))) 8880d160211SJeremy Fitzhardinge __skb_queue_tail(&errq, skb); 88909f75cd7SJeff Garzik dev->stats.rx_errors++; 8900d160211SJeremy Fitzhardinge i = np->rx.rsp_cons; 8910d160211SJeremy Fitzhardinge continue; 8920d160211SJeremy Fitzhardinge } 8930d160211SJeremy Fitzhardinge 8940d160211SJeremy Fitzhardinge skb = __skb_dequeue(&tmpq); 8950d160211SJeremy Fitzhardinge 8960d160211SJeremy Fitzhardinge if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { 8970d160211SJeremy Fitzhardinge struct xen_netif_extra_info *gso; 8980d160211SJeremy Fitzhardinge gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; 8990d160211SJeremy Fitzhardinge 9000d160211SJeremy Fitzhardinge if (unlikely(xennet_set_skb_gso(skb, gso))) { 9010d160211SJeremy Fitzhardinge __skb_queue_head(&tmpq, skb); 9020d160211SJeremy Fitzhardinge np->rx.rsp_cons += skb_queue_len(&tmpq); 9030d160211SJeremy Fitzhardinge goto err; 9040d160211SJeremy Fitzhardinge } 9050d160211SJeremy Fitzhardinge } 9060d160211SJeremy Fitzhardinge 9070d160211SJeremy Fitzhardinge NETFRONT_SKB_CB(skb)->page = skb_shinfo(skb)->frags[0].page; 9080d160211SJeremy Fitzhardinge NETFRONT_SKB_CB(skb)->offset = rx->offset; 9090d160211SJeremy Fitzhardinge 9100d160211SJeremy Fitzhardinge len = rx->status; 9110d160211SJeremy Fitzhardinge if (len > RX_COPY_THRESHOLD) 9120d160211SJeremy Fitzhardinge len = RX_COPY_THRESHOLD; 9130d160211SJeremy Fitzhardinge skb_put(skb, len); 9140d160211SJeremy Fitzhardinge 9150d160211SJeremy Fitzhardinge if (rx->status > len) { 9160d160211SJeremy Fitzhardinge skb_shinfo(skb)->frags[0].page_offset = 9170d160211SJeremy Fitzhardinge rx->offset + len; 9180d160211SJeremy Fitzhardinge skb_shinfo(skb)->frags[0].size = rx->status - len; 9190d160211SJeremy Fitzhardinge skb->data_len = rx->status - len; 9200d160211SJeremy Fitzhardinge } else { 9210d160211SJeremy Fitzhardinge skb_shinfo(skb)->frags[0].page = NULL; 9220d160211SJeremy Fitzhardinge skb_shinfo(skb)->nr_frags = 0; 9230d160211SJeremy Fitzhardinge } 9240d160211SJeremy Fitzhardinge 9250d160211SJeremy Fitzhardinge i = xennet_fill_frags(np, skb, &tmpq); 9260d160211SJeremy Fitzhardinge 9270d160211SJeremy Fitzhardinge /* 9280d160211SJeremy Fitzhardinge * Truesize approximates the size of true data plus 9290d160211SJeremy Fitzhardinge * any supervisor overheads. Adding hypervisor 9300d160211SJeremy Fitzhardinge * overheads has been shown to significantly reduce 9310d160211SJeremy Fitzhardinge * achievable bandwidth with the default receive 9320d160211SJeremy Fitzhardinge * buffer size. It is therefore not wise to account 9330d160211SJeremy Fitzhardinge * for it here. 9340d160211SJeremy Fitzhardinge * 9350d160211SJeremy Fitzhardinge * After alloc_skb(RX_COPY_THRESHOLD), truesize is set 9360d160211SJeremy Fitzhardinge * to RX_COPY_THRESHOLD + the supervisor 9370d160211SJeremy Fitzhardinge * overheads. Here, we add the size of the data pulled 9380d160211SJeremy Fitzhardinge * in xennet_fill_frags(). 9390d160211SJeremy Fitzhardinge * 9400d160211SJeremy Fitzhardinge * We also adjust for any unused space in the main 9410d160211SJeremy Fitzhardinge * data area by subtracting (RX_COPY_THRESHOLD - 9420d160211SJeremy Fitzhardinge * len). This is especially important with drivers 9430d160211SJeremy Fitzhardinge * which split incoming packets into header and data, 9440d160211SJeremy Fitzhardinge * using only 66 bytes of the main data area (see the 9450d160211SJeremy Fitzhardinge * e1000 driver for example.) On such systems, 9460d160211SJeremy Fitzhardinge * without this last adjustement, our achievable 9470d160211SJeremy Fitzhardinge * receive throughout using the standard receive 9480d160211SJeremy Fitzhardinge * buffer size was cut by 25%(!!!). 9490d160211SJeremy Fitzhardinge */ 9500d160211SJeremy Fitzhardinge skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len); 9510d160211SJeremy Fitzhardinge skb->len += skb->data_len; 9520d160211SJeremy Fitzhardinge 9530d160211SJeremy Fitzhardinge if (rx->flags & NETRXF_csum_blank) 9540d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_PARTIAL; 9550d160211SJeremy Fitzhardinge else if (rx->flags & NETRXF_data_validated) 9560d160211SJeremy Fitzhardinge skb->ip_summed = CHECKSUM_UNNECESSARY; 9570d160211SJeremy Fitzhardinge 9580d160211SJeremy Fitzhardinge __skb_queue_tail(&rxq, skb); 9590d160211SJeremy Fitzhardinge 9600d160211SJeremy Fitzhardinge np->rx.rsp_cons = ++i; 9610d160211SJeremy Fitzhardinge work_done++; 9620d160211SJeremy Fitzhardinge } 9630d160211SJeremy Fitzhardinge 96456cfe5d0SWang Chen __skb_queue_purge(&errq); 9650d160211SJeremy Fitzhardinge 9660d160211SJeremy Fitzhardinge work_done -= handle_incoming_queue(dev, &rxq); 9670d160211SJeremy Fitzhardinge 9680d160211SJeremy Fitzhardinge /* If we get a callback with very few responses, reduce fill target. */ 9690d160211SJeremy Fitzhardinge /* NB. Note exponential increase, linear decrease. */ 9700d160211SJeremy Fitzhardinge if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > 9710d160211SJeremy Fitzhardinge ((3*np->rx_target) / 4)) && 9720d160211SJeremy Fitzhardinge (--np->rx_target < np->rx_min_target)) 9730d160211SJeremy Fitzhardinge np->rx_target = np->rx_min_target; 9740d160211SJeremy Fitzhardinge 9750d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(dev); 9760d160211SJeremy Fitzhardinge 9770d160211SJeremy Fitzhardinge if (work_done < budget) { 978bea3348eSStephen Hemminger int more_to_do = 0; 979bea3348eSStephen Hemminger 9800d160211SJeremy Fitzhardinge local_irq_save(flags); 9810d160211SJeremy Fitzhardinge 9820d160211SJeremy Fitzhardinge RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); 9830d160211SJeremy Fitzhardinge if (!more_to_do) 984288379f0SBen Hutchings __napi_complete(napi); 9850d160211SJeremy Fitzhardinge 9860d160211SJeremy Fitzhardinge local_irq_restore(flags); 9870d160211SJeremy Fitzhardinge } 9880d160211SJeremy Fitzhardinge 9890d160211SJeremy Fitzhardinge spin_unlock(&np->rx_lock); 9900d160211SJeremy Fitzhardinge 991bea3348eSStephen Hemminger return work_done; 9920d160211SJeremy Fitzhardinge } 9930d160211SJeremy Fitzhardinge 9940d160211SJeremy Fitzhardinge static int xennet_change_mtu(struct net_device *dev, int mtu) 9950d160211SJeremy Fitzhardinge { 9960d160211SJeremy Fitzhardinge int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; 9970d160211SJeremy Fitzhardinge 9980d160211SJeremy Fitzhardinge if (mtu > max) 9990d160211SJeremy Fitzhardinge return -EINVAL; 10000d160211SJeremy Fitzhardinge dev->mtu = mtu; 10010d160211SJeremy Fitzhardinge return 0; 10020d160211SJeremy Fitzhardinge } 10030d160211SJeremy Fitzhardinge 10040d160211SJeremy Fitzhardinge static void xennet_release_tx_bufs(struct netfront_info *np) 10050d160211SJeremy Fitzhardinge { 10060d160211SJeremy Fitzhardinge struct sk_buff *skb; 10070d160211SJeremy Fitzhardinge int i; 10080d160211SJeremy Fitzhardinge 10090d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 10100d160211SJeremy Fitzhardinge /* Skip over entries which are actually freelist references */ 10111ffb40b8SIsaku Yamahata if (skb_entry_is_link(&np->tx_skbs[i])) 10120d160211SJeremy Fitzhardinge continue; 10130d160211SJeremy Fitzhardinge 10140d160211SJeremy Fitzhardinge skb = np->tx_skbs[i].skb; 10150d160211SJeremy Fitzhardinge gnttab_end_foreign_access_ref(np->grant_tx_ref[i], 10160d160211SJeremy Fitzhardinge GNTMAP_readonly); 10170d160211SJeremy Fitzhardinge gnttab_release_grant_reference(&np->gref_tx_head, 10180d160211SJeremy Fitzhardinge np->grant_tx_ref[i]); 10190d160211SJeremy Fitzhardinge np->grant_tx_ref[i] = GRANT_INVALID_REF; 10200d160211SJeremy Fitzhardinge add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); 10210d160211SJeremy Fitzhardinge dev_kfree_skb_irq(skb); 10220d160211SJeremy Fitzhardinge } 10230d160211SJeremy Fitzhardinge } 10240d160211SJeremy Fitzhardinge 10250d160211SJeremy Fitzhardinge static void xennet_release_rx_bufs(struct netfront_info *np) 10260d160211SJeremy Fitzhardinge { 10270d160211SJeremy Fitzhardinge struct mmu_update *mmu = np->rx_mmu; 10280d160211SJeremy Fitzhardinge struct multicall_entry *mcl = np->rx_mcl; 10290d160211SJeremy Fitzhardinge struct sk_buff_head free_list; 10300d160211SJeremy Fitzhardinge struct sk_buff *skb; 10310d160211SJeremy Fitzhardinge unsigned long mfn; 10320d160211SJeremy Fitzhardinge int xfer = 0, noxfer = 0, unused = 0; 10330d160211SJeremy Fitzhardinge int id, ref; 10340d160211SJeremy Fitzhardinge 10350d160211SJeremy Fitzhardinge dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", 10360d160211SJeremy Fitzhardinge __func__); 10370d160211SJeremy Fitzhardinge return; 10380d160211SJeremy Fitzhardinge 10390d160211SJeremy Fitzhardinge skb_queue_head_init(&free_list); 10400d160211SJeremy Fitzhardinge 10410d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 10420d160211SJeremy Fitzhardinge 10430d160211SJeremy Fitzhardinge for (id = 0; id < NET_RX_RING_SIZE; id++) { 10440d160211SJeremy Fitzhardinge ref = np->grant_rx_ref[id]; 10450d160211SJeremy Fitzhardinge if (ref == GRANT_INVALID_REF) { 10460d160211SJeremy Fitzhardinge unused++; 10470d160211SJeremy Fitzhardinge continue; 10480d160211SJeremy Fitzhardinge } 10490d160211SJeremy Fitzhardinge 10500d160211SJeremy Fitzhardinge skb = np->rx_skbs[id]; 10510d160211SJeremy Fitzhardinge mfn = gnttab_end_foreign_transfer_ref(ref); 10520d160211SJeremy Fitzhardinge gnttab_release_grant_reference(&np->gref_rx_head, ref); 10530d160211SJeremy Fitzhardinge np->grant_rx_ref[id] = GRANT_INVALID_REF; 10540d160211SJeremy Fitzhardinge 10550d160211SJeremy Fitzhardinge if (0 == mfn) { 10560d160211SJeremy Fitzhardinge skb_shinfo(skb)->nr_frags = 0; 10570d160211SJeremy Fitzhardinge dev_kfree_skb(skb); 10580d160211SJeremy Fitzhardinge noxfer++; 10590d160211SJeremy Fitzhardinge continue; 10600d160211SJeremy Fitzhardinge } 10610d160211SJeremy Fitzhardinge 10620d160211SJeremy Fitzhardinge if (!xen_feature(XENFEAT_auto_translated_physmap)) { 10630d160211SJeremy Fitzhardinge /* Remap the page. */ 10640d160211SJeremy Fitzhardinge struct page *page = skb_shinfo(skb)->frags[0].page; 10650d160211SJeremy Fitzhardinge unsigned long pfn = page_to_pfn(page); 10660d160211SJeremy Fitzhardinge void *vaddr = page_address(page); 10670d160211SJeremy Fitzhardinge 10680d160211SJeremy Fitzhardinge MULTI_update_va_mapping(mcl, (unsigned long)vaddr, 10690d160211SJeremy Fitzhardinge mfn_pte(mfn, PAGE_KERNEL), 10700d160211SJeremy Fitzhardinge 0); 10710d160211SJeremy Fitzhardinge mcl++; 10720d160211SJeremy Fitzhardinge mmu->ptr = ((u64)mfn << PAGE_SHIFT) 10730d160211SJeremy Fitzhardinge | MMU_MACHPHYS_UPDATE; 10740d160211SJeremy Fitzhardinge mmu->val = pfn; 10750d160211SJeremy Fitzhardinge mmu++; 10760d160211SJeremy Fitzhardinge 10770d160211SJeremy Fitzhardinge set_phys_to_machine(pfn, mfn); 10780d160211SJeremy Fitzhardinge } 10790d160211SJeremy Fitzhardinge __skb_queue_tail(&free_list, skb); 10800d160211SJeremy Fitzhardinge xfer++; 10810d160211SJeremy Fitzhardinge } 10820d160211SJeremy Fitzhardinge 10830d160211SJeremy Fitzhardinge dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", 10840d160211SJeremy Fitzhardinge __func__, xfer, noxfer, unused); 10850d160211SJeremy Fitzhardinge 10860d160211SJeremy Fitzhardinge if (xfer) { 10870d160211SJeremy Fitzhardinge if (!xen_feature(XENFEAT_auto_translated_physmap)) { 10880d160211SJeremy Fitzhardinge /* Do all the remapping work and M2P updates. */ 10890d160211SJeremy Fitzhardinge MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, 109079ea13ceSAl Viro NULL, DOMID_SELF); 10910d160211SJeremy Fitzhardinge mcl++; 10920d160211SJeremy Fitzhardinge HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); 10930d160211SJeremy Fitzhardinge } 10940d160211SJeremy Fitzhardinge } 10950d160211SJeremy Fitzhardinge 109656cfe5d0SWang Chen __skb_queue_purge(&free_list); 10970d160211SJeremy Fitzhardinge 10980d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 10990d160211SJeremy Fitzhardinge } 11000d160211SJeremy Fitzhardinge 11010d160211SJeremy Fitzhardinge static void xennet_uninit(struct net_device *dev) 11020d160211SJeremy Fitzhardinge { 11030d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 11040d160211SJeremy Fitzhardinge xennet_release_tx_bufs(np); 11050d160211SJeremy Fitzhardinge xennet_release_rx_bufs(np); 11060d160211SJeremy Fitzhardinge gnttab_free_grant_references(np->gref_tx_head); 11070d160211SJeremy Fitzhardinge gnttab_free_grant_references(np->gref_rx_head); 11080d160211SJeremy Fitzhardinge } 11090d160211SJeremy Fitzhardinge 11100a0b9d2eSStephen Hemminger static const struct net_device_ops xennet_netdev_ops = { 11110a0b9d2eSStephen Hemminger .ndo_open = xennet_open, 11120a0b9d2eSStephen Hemminger .ndo_uninit = xennet_uninit, 11130a0b9d2eSStephen Hemminger .ndo_stop = xennet_close, 11140a0b9d2eSStephen Hemminger .ndo_start_xmit = xennet_start_xmit, 11150a0b9d2eSStephen Hemminger .ndo_change_mtu = xennet_change_mtu, 11160a0b9d2eSStephen Hemminger .ndo_set_mac_address = eth_mac_addr, 11170a0b9d2eSStephen Hemminger .ndo_validate_addr = eth_validate_addr, 11180a0b9d2eSStephen Hemminger }; 11190a0b9d2eSStephen Hemminger 11200d160211SJeremy Fitzhardinge static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) 11210d160211SJeremy Fitzhardinge { 11220d160211SJeremy Fitzhardinge int i, err; 11230d160211SJeremy Fitzhardinge struct net_device *netdev; 11240d160211SJeremy Fitzhardinge struct netfront_info *np; 11250d160211SJeremy Fitzhardinge 11260d160211SJeremy Fitzhardinge netdev = alloc_etherdev(sizeof(struct netfront_info)); 11270d160211SJeremy Fitzhardinge if (!netdev) { 11280d160211SJeremy Fitzhardinge printk(KERN_WARNING "%s> alloc_etherdev failed.\n", 11290d160211SJeremy Fitzhardinge __func__); 11300d160211SJeremy Fitzhardinge return ERR_PTR(-ENOMEM); 11310d160211SJeremy Fitzhardinge } 11320d160211SJeremy Fitzhardinge 11330d160211SJeremy Fitzhardinge np = netdev_priv(netdev); 11340d160211SJeremy Fitzhardinge np->xbdev = dev; 11350d160211SJeremy Fitzhardinge 11360d160211SJeremy Fitzhardinge spin_lock_init(&np->tx_lock); 11370d160211SJeremy Fitzhardinge spin_lock_init(&np->rx_lock); 11380d160211SJeremy Fitzhardinge 11390d160211SJeremy Fitzhardinge skb_queue_head_init(&np->rx_batch); 11400d160211SJeremy Fitzhardinge np->rx_target = RX_DFL_MIN_TARGET; 11410d160211SJeremy Fitzhardinge np->rx_min_target = RX_DFL_MIN_TARGET; 11420d160211SJeremy Fitzhardinge np->rx_max_target = RX_MAX_TARGET; 11430d160211SJeremy Fitzhardinge 11440d160211SJeremy Fitzhardinge init_timer(&np->rx_refill_timer); 11450d160211SJeremy Fitzhardinge np->rx_refill_timer.data = (unsigned long)netdev; 11460d160211SJeremy Fitzhardinge np->rx_refill_timer.function = rx_refill_timeout; 11470d160211SJeremy Fitzhardinge 11480d160211SJeremy Fitzhardinge /* Initialise tx_skbs as a free chain containing every entry. */ 11490d160211SJeremy Fitzhardinge np->tx_skb_freelist = 0; 11500d160211SJeremy Fitzhardinge for (i = 0; i < NET_TX_RING_SIZE; i++) { 11511ffb40b8SIsaku Yamahata skb_entry_set_link(&np->tx_skbs[i], i+1); 11520d160211SJeremy Fitzhardinge np->grant_tx_ref[i] = GRANT_INVALID_REF; 11530d160211SJeremy Fitzhardinge } 11540d160211SJeremy Fitzhardinge 11550d160211SJeremy Fitzhardinge /* Clear out rx_skbs */ 11560d160211SJeremy Fitzhardinge for (i = 0; i < NET_RX_RING_SIZE; i++) { 11570d160211SJeremy Fitzhardinge np->rx_skbs[i] = NULL; 11580d160211SJeremy Fitzhardinge np->grant_rx_ref[i] = GRANT_INVALID_REF; 11590d160211SJeremy Fitzhardinge } 11600d160211SJeremy Fitzhardinge 11610d160211SJeremy Fitzhardinge /* A grant for every tx ring slot */ 11620d160211SJeremy Fitzhardinge if (gnttab_alloc_grant_references(TX_MAX_TARGET, 11630d160211SJeremy Fitzhardinge &np->gref_tx_head) < 0) { 11640d160211SJeremy Fitzhardinge printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); 11650d160211SJeremy Fitzhardinge err = -ENOMEM; 11660d160211SJeremy Fitzhardinge goto exit; 11670d160211SJeremy Fitzhardinge } 11680d160211SJeremy Fitzhardinge /* A grant for every rx ring slot */ 11690d160211SJeremy Fitzhardinge if (gnttab_alloc_grant_references(RX_MAX_TARGET, 11700d160211SJeremy Fitzhardinge &np->gref_rx_head) < 0) { 11710d160211SJeremy Fitzhardinge printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); 11720d160211SJeremy Fitzhardinge err = -ENOMEM; 11730d160211SJeremy Fitzhardinge goto exit_free_tx; 11740d160211SJeremy Fitzhardinge } 11750d160211SJeremy Fitzhardinge 11760a0b9d2eSStephen Hemminger netdev->netdev_ops = &xennet_netdev_ops; 11770a0b9d2eSStephen Hemminger 1178bea3348eSStephen Hemminger netif_napi_add(netdev, &np->napi, xennet_poll, 64); 11790d160211SJeremy Fitzhardinge netdev->features = NETIF_F_IP_CSUM; 11800d160211SJeremy Fitzhardinge 11810d160211SJeremy Fitzhardinge SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); 11820d160211SJeremy Fitzhardinge SET_NETDEV_DEV(netdev, &dev->dev); 11830d160211SJeremy Fitzhardinge 11840d160211SJeremy Fitzhardinge np->netdev = netdev; 11850d160211SJeremy Fitzhardinge 11860d160211SJeremy Fitzhardinge netif_carrier_off(netdev); 11870d160211SJeremy Fitzhardinge 11880d160211SJeremy Fitzhardinge return netdev; 11890d160211SJeremy Fitzhardinge 11900d160211SJeremy Fitzhardinge exit_free_tx: 11910d160211SJeremy Fitzhardinge gnttab_free_grant_references(np->gref_tx_head); 11920d160211SJeremy Fitzhardinge exit: 11930d160211SJeremy Fitzhardinge free_netdev(netdev); 11940d160211SJeremy Fitzhardinge return ERR_PTR(err); 11950d160211SJeremy Fitzhardinge } 11960d160211SJeremy Fitzhardinge 11970d160211SJeremy Fitzhardinge /** 11980d160211SJeremy Fitzhardinge * Entry point to this code when a new device is created. Allocate the basic 11990d160211SJeremy Fitzhardinge * structures and the ring buffers for communication with the backend, and 12000d160211SJeremy Fitzhardinge * inform the backend of the appropriate details for those. 12010d160211SJeremy Fitzhardinge */ 12020d160211SJeremy Fitzhardinge static int __devinit netfront_probe(struct xenbus_device *dev, 12030d160211SJeremy Fitzhardinge const struct xenbus_device_id *id) 12040d160211SJeremy Fitzhardinge { 12050d160211SJeremy Fitzhardinge int err; 12060d160211SJeremy Fitzhardinge struct net_device *netdev; 12070d160211SJeremy Fitzhardinge struct netfront_info *info; 12080d160211SJeremy Fitzhardinge 12090d160211SJeremy Fitzhardinge netdev = xennet_create_dev(dev); 12100d160211SJeremy Fitzhardinge if (IS_ERR(netdev)) { 12110d160211SJeremy Fitzhardinge err = PTR_ERR(netdev); 12120d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "creating netdev"); 12130d160211SJeremy Fitzhardinge return err; 12140d160211SJeremy Fitzhardinge } 12150d160211SJeremy Fitzhardinge 12160d160211SJeremy Fitzhardinge info = netdev_priv(netdev); 12171b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, info); 12180d160211SJeremy Fitzhardinge 12190d160211SJeremy Fitzhardinge err = register_netdev(info->netdev); 12200d160211SJeremy Fitzhardinge if (err) { 12210d160211SJeremy Fitzhardinge printk(KERN_WARNING "%s: register_netdev err=%d\n", 12220d160211SJeremy Fitzhardinge __func__, err); 12230d160211SJeremy Fitzhardinge goto fail; 12240d160211SJeremy Fitzhardinge } 12250d160211SJeremy Fitzhardinge 12260d160211SJeremy Fitzhardinge err = xennet_sysfs_addif(info->netdev); 12270d160211SJeremy Fitzhardinge if (err) { 12280d160211SJeremy Fitzhardinge unregister_netdev(info->netdev); 12290d160211SJeremy Fitzhardinge printk(KERN_WARNING "%s: add sysfs failed err=%d\n", 12300d160211SJeremy Fitzhardinge __func__, err); 12310d160211SJeremy Fitzhardinge goto fail; 12320d160211SJeremy Fitzhardinge } 12330d160211SJeremy Fitzhardinge 12340d160211SJeremy Fitzhardinge return 0; 12350d160211SJeremy Fitzhardinge 12360d160211SJeremy Fitzhardinge fail: 12370d160211SJeremy Fitzhardinge free_netdev(netdev); 12381b713e00SGreg Kroah-Hartman dev_set_drvdata(&dev->dev, NULL); 12390d160211SJeremy Fitzhardinge return err; 12400d160211SJeremy Fitzhardinge } 12410d160211SJeremy Fitzhardinge 12420d160211SJeremy Fitzhardinge static void xennet_end_access(int ref, void *page) 12430d160211SJeremy Fitzhardinge { 12440d160211SJeremy Fitzhardinge /* This frees the page as a side-effect */ 12450d160211SJeremy Fitzhardinge if (ref != GRANT_INVALID_REF) 12460d160211SJeremy Fitzhardinge gnttab_end_foreign_access(ref, 0, (unsigned long)page); 12470d160211SJeremy Fitzhardinge } 12480d160211SJeremy Fitzhardinge 12490d160211SJeremy Fitzhardinge static void xennet_disconnect_backend(struct netfront_info *info) 12500d160211SJeremy Fitzhardinge { 12510d160211SJeremy Fitzhardinge /* Stop old i/f to prevent errors whilst we rebuild the state. */ 12520d160211SJeremy Fitzhardinge spin_lock_bh(&info->rx_lock); 12530d160211SJeremy Fitzhardinge spin_lock_irq(&info->tx_lock); 12540d160211SJeremy Fitzhardinge netif_carrier_off(info->netdev); 12550d160211SJeremy Fitzhardinge spin_unlock_irq(&info->tx_lock); 12560d160211SJeremy Fitzhardinge spin_unlock_bh(&info->rx_lock); 12570d160211SJeremy Fitzhardinge 12580d160211SJeremy Fitzhardinge if (info->netdev->irq) 12590d160211SJeremy Fitzhardinge unbind_from_irqhandler(info->netdev->irq, info->netdev); 12600d160211SJeremy Fitzhardinge info->evtchn = info->netdev->irq = 0; 12610d160211SJeremy Fitzhardinge 12620d160211SJeremy Fitzhardinge /* End access and free the pages */ 12630d160211SJeremy Fitzhardinge xennet_end_access(info->tx_ring_ref, info->tx.sring); 12640d160211SJeremy Fitzhardinge xennet_end_access(info->rx_ring_ref, info->rx.sring); 12650d160211SJeremy Fitzhardinge 12660d160211SJeremy Fitzhardinge info->tx_ring_ref = GRANT_INVALID_REF; 12670d160211SJeremy Fitzhardinge info->rx_ring_ref = GRANT_INVALID_REF; 12680d160211SJeremy Fitzhardinge info->tx.sring = NULL; 12690d160211SJeremy Fitzhardinge info->rx.sring = NULL; 12700d160211SJeremy Fitzhardinge } 12710d160211SJeremy Fitzhardinge 12720d160211SJeremy Fitzhardinge /** 12730d160211SJeremy Fitzhardinge * We are reconnecting to the backend, due to a suspend/resume, or a backend 12740d160211SJeremy Fitzhardinge * driver restart. We tear down our netif structure and recreate it, but 12750d160211SJeremy Fitzhardinge * leave the device-layer structures intact so that this is transparent to the 12760d160211SJeremy Fitzhardinge * rest of the kernel. 12770d160211SJeremy Fitzhardinge */ 12780d160211SJeremy Fitzhardinge static int netfront_resume(struct xenbus_device *dev) 12790d160211SJeremy Fitzhardinge { 12801b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 12810d160211SJeremy Fitzhardinge 12820d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 12830d160211SJeremy Fitzhardinge 12840d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 12850d160211SJeremy Fitzhardinge return 0; 12860d160211SJeremy Fitzhardinge } 12870d160211SJeremy Fitzhardinge 12880d160211SJeremy Fitzhardinge static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) 12890d160211SJeremy Fitzhardinge { 12900d160211SJeremy Fitzhardinge char *s, *e, *macstr; 12910d160211SJeremy Fitzhardinge int i; 12920d160211SJeremy Fitzhardinge 12930d160211SJeremy Fitzhardinge macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); 12940d160211SJeremy Fitzhardinge if (IS_ERR(macstr)) 12950d160211SJeremy Fitzhardinge return PTR_ERR(macstr); 12960d160211SJeremy Fitzhardinge 12970d160211SJeremy Fitzhardinge for (i = 0; i < ETH_ALEN; i++) { 12980d160211SJeremy Fitzhardinge mac[i] = simple_strtoul(s, &e, 16); 12990d160211SJeremy Fitzhardinge if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { 13000d160211SJeremy Fitzhardinge kfree(macstr); 13010d160211SJeremy Fitzhardinge return -ENOENT; 13020d160211SJeremy Fitzhardinge } 13030d160211SJeremy Fitzhardinge s = e+1; 13040d160211SJeremy Fitzhardinge } 13050d160211SJeremy Fitzhardinge 13060d160211SJeremy Fitzhardinge kfree(macstr); 13070d160211SJeremy Fitzhardinge return 0; 13080d160211SJeremy Fitzhardinge } 13090d160211SJeremy Fitzhardinge 13100d160211SJeremy Fitzhardinge static irqreturn_t xennet_interrupt(int irq, void *dev_id) 13110d160211SJeremy Fitzhardinge { 13120d160211SJeremy Fitzhardinge struct net_device *dev = dev_id; 13130d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 13140d160211SJeremy Fitzhardinge unsigned long flags; 13150d160211SJeremy Fitzhardinge 13160d160211SJeremy Fitzhardinge spin_lock_irqsave(&np->tx_lock, flags); 13170d160211SJeremy Fitzhardinge 13180d160211SJeremy Fitzhardinge if (likely(netif_carrier_ok(dev))) { 13190d160211SJeremy Fitzhardinge xennet_tx_buf_gc(dev); 13200d160211SJeremy Fitzhardinge /* Under tx_lock: protects access to rx shared-ring indexes. */ 13210d160211SJeremy Fitzhardinge if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) 1322288379f0SBen Hutchings napi_schedule(&np->napi); 13230d160211SJeremy Fitzhardinge } 13240d160211SJeremy Fitzhardinge 13250d160211SJeremy Fitzhardinge spin_unlock_irqrestore(&np->tx_lock, flags); 13260d160211SJeremy Fitzhardinge 13270d160211SJeremy Fitzhardinge return IRQ_HANDLED; 13280d160211SJeremy Fitzhardinge } 13290d160211SJeremy Fitzhardinge 13300d160211SJeremy Fitzhardinge static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) 13310d160211SJeremy Fitzhardinge { 13320d160211SJeremy Fitzhardinge struct xen_netif_tx_sring *txs; 13330d160211SJeremy Fitzhardinge struct xen_netif_rx_sring *rxs; 13340d160211SJeremy Fitzhardinge int err; 13350d160211SJeremy Fitzhardinge struct net_device *netdev = info->netdev; 13360d160211SJeremy Fitzhardinge 13370d160211SJeremy Fitzhardinge info->tx_ring_ref = GRANT_INVALID_REF; 13380d160211SJeremy Fitzhardinge info->rx_ring_ref = GRANT_INVALID_REF; 13390d160211SJeremy Fitzhardinge info->rx.sring = NULL; 13400d160211SJeremy Fitzhardinge info->tx.sring = NULL; 13410d160211SJeremy Fitzhardinge netdev->irq = 0; 13420d160211SJeremy Fitzhardinge 13430d160211SJeremy Fitzhardinge err = xen_net_read_mac(dev, netdev->dev_addr); 13440d160211SJeremy Fitzhardinge if (err) { 13450d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); 13460d160211SJeremy Fitzhardinge goto fail; 13470d160211SJeremy Fitzhardinge } 13480d160211SJeremy Fitzhardinge 1349a144ff09SIan Campbell txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 13500d160211SJeremy Fitzhardinge if (!txs) { 13510d160211SJeremy Fitzhardinge err = -ENOMEM; 13520d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating tx ring page"); 13530d160211SJeremy Fitzhardinge goto fail; 13540d160211SJeremy Fitzhardinge } 13550d160211SJeremy Fitzhardinge SHARED_RING_INIT(txs); 13560d160211SJeremy Fitzhardinge FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); 13570d160211SJeremy Fitzhardinge 13580d160211SJeremy Fitzhardinge err = xenbus_grant_ring(dev, virt_to_mfn(txs)); 13590d160211SJeremy Fitzhardinge if (err < 0) { 13600d160211SJeremy Fitzhardinge free_page((unsigned long)txs); 13610d160211SJeremy Fitzhardinge goto fail; 13620d160211SJeremy Fitzhardinge } 13630d160211SJeremy Fitzhardinge 13640d160211SJeremy Fitzhardinge info->tx_ring_ref = err; 1365a144ff09SIan Campbell rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); 13660d160211SJeremy Fitzhardinge if (!rxs) { 13670d160211SJeremy Fitzhardinge err = -ENOMEM; 13680d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "allocating rx ring page"); 13690d160211SJeremy Fitzhardinge goto fail; 13700d160211SJeremy Fitzhardinge } 13710d160211SJeremy Fitzhardinge SHARED_RING_INIT(rxs); 13720d160211SJeremy Fitzhardinge FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); 13730d160211SJeremy Fitzhardinge 13740d160211SJeremy Fitzhardinge err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); 13750d160211SJeremy Fitzhardinge if (err < 0) { 13760d160211SJeremy Fitzhardinge free_page((unsigned long)rxs); 13770d160211SJeremy Fitzhardinge goto fail; 13780d160211SJeremy Fitzhardinge } 13790d160211SJeremy Fitzhardinge info->rx_ring_ref = err; 13800d160211SJeremy Fitzhardinge 13810d160211SJeremy Fitzhardinge err = xenbus_alloc_evtchn(dev, &info->evtchn); 13820d160211SJeremy Fitzhardinge if (err) 13830d160211SJeremy Fitzhardinge goto fail; 13840d160211SJeremy Fitzhardinge 13850d160211SJeremy Fitzhardinge err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, 13860d160211SJeremy Fitzhardinge IRQF_SAMPLE_RANDOM, netdev->name, 13870d160211SJeremy Fitzhardinge netdev); 13880d160211SJeremy Fitzhardinge if (err < 0) 13890d160211SJeremy Fitzhardinge goto fail; 13900d160211SJeremy Fitzhardinge netdev->irq = err; 13910d160211SJeremy Fitzhardinge return 0; 13920d160211SJeremy Fitzhardinge 13930d160211SJeremy Fitzhardinge fail: 13940d160211SJeremy Fitzhardinge return err; 13950d160211SJeremy Fitzhardinge } 13960d160211SJeremy Fitzhardinge 13970d160211SJeremy Fitzhardinge /* Common code used when first setting up, and when resuming. */ 1398f502bf2bSIan Campbell static int talk_to_netback(struct xenbus_device *dev, 13990d160211SJeremy Fitzhardinge struct netfront_info *info) 14000d160211SJeremy Fitzhardinge { 14010d160211SJeremy Fitzhardinge const char *message; 14020d160211SJeremy Fitzhardinge struct xenbus_transaction xbt; 14030d160211SJeremy Fitzhardinge int err; 14040d160211SJeremy Fitzhardinge 14050d160211SJeremy Fitzhardinge /* Create shared ring, alloc event channel. */ 14060d160211SJeremy Fitzhardinge err = setup_netfront(dev, info); 14070d160211SJeremy Fitzhardinge if (err) 14080d160211SJeremy Fitzhardinge goto out; 14090d160211SJeremy Fitzhardinge 14100d160211SJeremy Fitzhardinge again: 14110d160211SJeremy Fitzhardinge err = xenbus_transaction_start(&xbt); 14120d160211SJeremy Fitzhardinge if (err) { 14130d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "starting transaction"); 14140d160211SJeremy Fitzhardinge goto destroy_ring; 14150d160211SJeremy Fitzhardinge } 14160d160211SJeremy Fitzhardinge 14170d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", 14180d160211SJeremy Fitzhardinge info->tx_ring_ref); 14190d160211SJeremy Fitzhardinge if (err) { 14200d160211SJeremy Fitzhardinge message = "writing tx ring-ref"; 14210d160211SJeremy Fitzhardinge goto abort_transaction; 14220d160211SJeremy Fitzhardinge } 14230d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", 14240d160211SJeremy Fitzhardinge info->rx_ring_ref); 14250d160211SJeremy Fitzhardinge if (err) { 14260d160211SJeremy Fitzhardinge message = "writing rx ring-ref"; 14270d160211SJeremy Fitzhardinge goto abort_transaction; 14280d160211SJeremy Fitzhardinge } 14290d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, 14300d160211SJeremy Fitzhardinge "event-channel", "%u", info->evtchn); 14310d160211SJeremy Fitzhardinge if (err) { 14320d160211SJeremy Fitzhardinge message = "writing event-channel"; 14330d160211SJeremy Fitzhardinge goto abort_transaction; 14340d160211SJeremy Fitzhardinge } 14350d160211SJeremy Fitzhardinge 14360d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 14370d160211SJeremy Fitzhardinge 1); 14380d160211SJeremy Fitzhardinge if (err) { 14390d160211SJeremy Fitzhardinge message = "writing request-rx-copy"; 14400d160211SJeremy Fitzhardinge goto abort_transaction; 14410d160211SJeremy Fitzhardinge } 14420d160211SJeremy Fitzhardinge 14430d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); 14440d160211SJeremy Fitzhardinge if (err) { 14450d160211SJeremy Fitzhardinge message = "writing feature-rx-notify"; 14460d160211SJeremy Fitzhardinge goto abort_transaction; 14470d160211SJeremy Fitzhardinge } 14480d160211SJeremy Fitzhardinge 14490d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); 14500d160211SJeremy Fitzhardinge if (err) { 14510d160211SJeremy Fitzhardinge message = "writing feature-sg"; 14520d160211SJeremy Fitzhardinge goto abort_transaction; 14530d160211SJeremy Fitzhardinge } 14540d160211SJeremy Fitzhardinge 14550d160211SJeremy Fitzhardinge err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); 14560d160211SJeremy Fitzhardinge if (err) { 14570d160211SJeremy Fitzhardinge message = "writing feature-gso-tcpv4"; 14580d160211SJeremy Fitzhardinge goto abort_transaction; 14590d160211SJeremy Fitzhardinge } 14600d160211SJeremy Fitzhardinge 14610d160211SJeremy Fitzhardinge err = xenbus_transaction_end(xbt, 0); 14620d160211SJeremy Fitzhardinge if (err) { 14630d160211SJeremy Fitzhardinge if (err == -EAGAIN) 14640d160211SJeremy Fitzhardinge goto again; 14650d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "completing transaction"); 14660d160211SJeremy Fitzhardinge goto destroy_ring; 14670d160211SJeremy Fitzhardinge } 14680d160211SJeremy Fitzhardinge 14690d160211SJeremy Fitzhardinge return 0; 14700d160211SJeremy Fitzhardinge 14710d160211SJeremy Fitzhardinge abort_transaction: 14720d160211SJeremy Fitzhardinge xenbus_transaction_end(xbt, 1); 14730d160211SJeremy Fitzhardinge xenbus_dev_fatal(dev, err, "%s", message); 14740d160211SJeremy Fitzhardinge destroy_ring: 14750d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 14760d160211SJeremy Fitzhardinge out: 14770d160211SJeremy Fitzhardinge return err; 14780d160211SJeremy Fitzhardinge } 14790d160211SJeremy Fitzhardinge 14800d160211SJeremy Fitzhardinge static int xennet_set_sg(struct net_device *dev, u32 data) 14810d160211SJeremy Fitzhardinge { 14820d160211SJeremy Fitzhardinge if (data) { 14830d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 14840d160211SJeremy Fitzhardinge int val; 14850d160211SJeremy Fitzhardinge 14860d160211SJeremy Fitzhardinge if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", 14870d160211SJeremy Fitzhardinge "%d", &val) < 0) 14880d160211SJeremy Fitzhardinge val = 0; 14890d160211SJeremy Fitzhardinge if (!val) 14900d160211SJeremy Fitzhardinge return -ENOSYS; 14910d160211SJeremy Fitzhardinge } else if (dev->mtu > ETH_DATA_LEN) 14920d160211SJeremy Fitzhardinge dev->mtu = ETH_DATA_LEN; 14930d160211SJeremy Fitzhardinge 14940d160211SJeremy Fitzhardinge return ethtool_op_set_sg(dev, data); 14950d160211SJeremy Fitzhardinge } 14960d160211SJeremy Fitzhardinge 14970d160211SJeremy Fitzhardinge static int xennet_set_tso(struct net_device *dev, u32 data) 14980d160211SJeremy Fitzhardinge { 14990d160211SJeremy Fitzhardinge if (data) { 15000d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 15010d160211SJeremy Fitzhardinge int val; 15020d160211SJeremy Fitzhardinge 15030d160211SJeremy Fitzhardinge if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, 15040d160211SJeremy Fitzhardinge "feature-gso-tcpv4", "%d", &val) < 0) 15050d160211SJeremy Fitzhardinge val = 0; 15060d160211SJeremy Fitzhardinge if (!val) 15070d160211SJeremy Fitzhardinge return -ENOSYS; 15080d160211SJeremy Fitzhardinge } 15090d160211SJeremy Fitzhardinge 15100d160211SJeremy Fitzhardinge return ethtool_op_set_tso(dev, data); 15110d160211SJeremy Fitzhardinge } 15120d160211SJeremy Fitzhardinge 15130d160211SJeremy Fitzhardinge static void xennet_set_features(struct net_device *dev) 15140d160211SJeremy Fitzhardinge { 15150d160211SJeremy Fitzhardinge /* Turn off all GSO bits except ROBUST. */ 151643eb99c5SChris Leech dev->features &= ~NETIF_F_GSO_MASK; 15170d160211SJeremy Fitzhardinge dev->features |= NETIF_F_GSO_ROBUST; 15180d160211SJeremy Fitzhardinge xennet_set_sg(dev, 0); 15190d160211SJeremy Fitzhardinge 15200d160211SJeremy Fitzhardinge /* We need checksum offload to enable scatter/gather and TSO. */ 15210d160211SJeremy Fitzhardinge if (!(dev->features & NETIF_F_IP_CSUM)) 15220d160211SJeremy Fitzhardinge return; 15230d160211SJeremy Fitzhardinge 15240d160211SJeremy Fitzhardinge if (!xennet_set_sg(dev, 1)) 15250d160211SJeremy Fitzhardinge xennet_set_tso(dev, 1); 15260d160211SJeremy Fitzhardinge } 15270d160211SJeremy Fitzhardinge 15280d160211SJeremy Fitzhardinge static int xennet_connect(struct net_device *dev) 15290d160211SJeremy Fitzhardinge { 15300d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(dev); 15310d160211SJeremy Fitzhardinge int i, requeue_idx, err; 15320d160211SJeremy Fitzhardinge struct sk_buff *skb; 15330d160211SJeremy Fitzhardinge grant_ref_t ref; 15340d160211SJeremy Fitzhardinge struct xen_netif_rx_request *req; 15350d160211SJeremy Fitzhardinge unsigned int feature_rx_copy; 15360d160211SJeremy Fitzhardinge 15370d160211SJeremy Fitzhardinge err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, 15380d160211SJeremy Fitzhardinge "feature-rx-copy", "%u", &feature_rx_copy); 15390d160211SJeremy Fitzhardinge if (err != 1) 15400d160211SJeremy Fitzhardinge feature_rx_copy = 0; 15410d160211SJeremy Fitzhardinge 15420d160211SJeremy Fitzhardinge if (!feature_rx_copy) { 15430d160211SJeremy Fitzhardinge dev_info(&dev->dev, 1544898eb71cSJoe Perches "backend does not support copying receive path\n"); 15450d160211SJeremy Fitzhardinge return -ENODEV; 15460d160211SJeremy Fitzhardinge } 15470d160211SJeremy Fitzhardinge 1548f502bf2bSIan Campbell err = talk_to_netback(np->xbdev, np); 15490d160211SJeremy Fitzhardinge if (err) 15500d160211SJeremy Fitzhardinge return err; 15510d160211SJeremy Fitzhardinge 15520d160211SJeremy Fitzhardinge xennet_set_features(dev); 15530d160211SJeremy Fitzhardinge 15540d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 15550d160211SJeremy Fitzhardinge spin_lock_irq(&np->tx_lock); 15560d160211SJeremy Fitzhardinge 15570d160211SJeremy Fitzhardinge /* Step 1: Discard all pending TX packet fragments. */ 15580d160211SJeremy Fitzhardinge xennet_release_tx_bufs(np); 15590d160211SJeremy Fitzhardinge 15600d160211SJeremy Fitzhardinge /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ 15610d160211SJeremy Fitzhardinge for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { 15620d160211SJeremy Fitzhardinge if (!np->rx_skbs[i]) 15630d160211SJeremy Fitzhardinge continue; 15640d160211SJeremy Fitzhardinge 15650d160211SJeremy Fitzhardinge skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); 15660d160211SJeremy Fitzhardinge ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); 15670d160211SJeremy Fitzhardinge req = RING_GET_REQUEST(&np->rx, requeue_idx); 15680d160211SJeremy Fitzhardinge 15690d160211SJeremy Fitzhardinge gnttab_grant_foreign_access_ref( 15700d160211SJeremy Fitzhardinge ref, np->xbdev->otherend_id, 15710d160211SJeremy Fitzhardinge pfn_to_mfn(page_to_pfn(skb_shinfo(skb)-> 15720d160211SJeremy Fitzhardinge frags->page)), 15730d160211SJeremy Fitzhardinge 0); 15740d160211SJeremy Fitzhardinge req->gref = ref; 15750d160211SJeremy Fitzhardinge req->id = requeue_idx; 15760d160211SJeremy Fitzhardinge 15770d160211SJeremy Fitzhardinge requeue_idx++; 15780d160211SJeremy Fitzhardinge } 15790d160211SJeremy Fitzhardinge 15800d160211SJeremy Fitzhardinge np->rx.req_prod_pvt = requeue_idx; 15810d160211SJeremy Fitzhardinge 15820d160211SJeremy Fitzhardinge /* 15830d160211SJeremy Fitzhardinge * Step 3: All public and private state should now be sane. Get 15840d160211SJeremy Fitzhardinge * ready to start sending and receiving packets and give the driver 15850d160211SJeremy Fitzhardinge * domain a kick because we've probably just requeued some 15860d160211SJeremy Fitzhardinge * packets. 15870d160211SJeremy Fitzhardinge */ 15880d160211SJeremy Fitzhardinge netif_carrier_on(np->netdev); 15890d160211SJeremy Fitzhardinge notify_remote_via_irq(np->netdev->irq); 15900d160211SJeremy Fitzhardinge xennet_tx_buf_gc(dev); 15910d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(dev); 15920d160211SJeremy Fitzhardinge 15930d160211SJeremy Fitzhardinge spin_unlock_irq(&np->tx_lock); 15940d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 15950d160211SJeremy Fitzhardinge 15960d160211SJeremy Fitzhardinge return 0; 15970d160211SJeremy Fitzhardinge } 15980d160211SJeremy Fitzhardinge 15990d160211SJeremy Fitzhardinge /** 16000d160211SJeremy Fitzhardinge * Callback received when the backend's state changes. 16010d160211SJeremy Fitzhardinge */ 1602f502bf2bSIan Campbell static void netback_changed(struct xenbus_device *dev, 16030d160211SJeremy Fitzhardinge enum xenbus_state backend_state) 16040d160211SJeremy Fitzhardinge { 16051b713e00SGreg Kroah-Hartman struct netfront_info *np = dev_get_drvdata(&dev->dev); 16060d160211SJeremy Fitzhardinge struct net_device *netdev = np->netdev; 16070d160211SJeremy Fitzhardinge 16080d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); 16090d160211SJeremy Fitzhardinge 16100d160211SJeremy Fitzhardinge switch (backend_state) { 16110d160211SJeremy Fitzhardinge case XenbusStateInitialising: 16120d160211SJeremy Fitzhardinge case XenbusStateInitialised: 1613b78c9512SNoboru Iwamatsu case XenbusStateReconfiguring: 1614b78c9512SNoboru Iwamatsu case XenbusStateReconfigured: 16150d160211SJeremy Fitzhardinge case XenbusStateConnected: 16160d160211SJeremy Fitzhardinge case XenbusStateUnknown: 16170d160211SJeremy Fitzhardinge case XenbusStateClosed: 16180d160211SJeremy Fitzhardinge break; 16190d160211SJeremy Fitzhardinge 16200d160211SJeremy Fitzhardinge case XenbusStateInitWait: 16210d160211SJeremy Fitzhardinge if (dev->state != XenbusStateInitialising) 16220d160211SJeremy Fitzhardinge break; 16230d160211SJeremy Fitzhardinge if (xennet_connect(netdev) != 0) 16240d160211SJeremy Fitzhardinge break; 16250d160211SJeremy Fitzhardinge xenbus_switch_state(dev, XenbusStateConnected); 162659297067SIan Campbell netif_notify_peers(netdev); 16270d160211SJeremy Fitzhardinge break; 16280d160211SJeremy Fitzhardinge 16290d160211SJeremy Fitzhardinge case XenbusStateClosing: 16300d160211SJeremy Fitzhardinge xenbus_frontend_closed(dev); 16310d160211SJeremy Fitzhardinge break; 16320d160211SJeremy Fitzhardinge } 16330d160211SJeremy Fitzhardinge } 16340d160211SJeremy Fitzhardinge 16350fc0b732SStephen Hemminger static const struct ethtool_ops xennet_ethtool_ops = 16360d160211SJeremy Fitzhardinge { 16370d160211SJeremy Fitzhardinge .set_tx_csum = ethtool_op_set_tx_csum, 16380d160211SJeremy Fitzhardinge .set_sg = xennet_set_sg, 16390d160211SJeremy Fitzhardinge .set_tso = xennet_set_tso, 16400d160211SJeremy Fitzhardinge .get_link = ethtool_op_get_link, 16410d160211SJeremy Fitzhardinge }; 16420d160211SJeremy Fitzhardinge 16430d160211SJeremy Fitzhardinge #ifdef CONFIG_SYSFS 16440d160211SJeremy Fitzhardinge static ssize_t show_rxbuf_min(struct device *dev, 16450d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 16460d160211SJeremy Fitzhardinge { 16470d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 16480d160211SJeremy Fitzhardinge struct netfront_info *info = netdev_priv(netdev); 16490d160211SJeremy Fitzhardinge 16500d160211SJeremy Fitzhardinge return sprintf(buf, "%u\n", info->rx_min_target); 16510d160211SJeremy Fitzhardinge } 16520d160211SJeremy Fitzhardinge 16530d160211SJeremy Fitzhardinge static ssize_t store_rxbuf_min(struct device *dev, 16540d160211SJeremy Fitzhardinge struct device_attribute *attr, 16550d160211SJeremy Fitzhardinge const char *buf, size_t len) 16560d160211SJeremy Fitzhardinge { 16570d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 16580d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(netdev); 16590d160211SJeremy Fitzhardinge char *endp; 16600d160211SJeremy Fitzhardinge unsigned long target; 16610d160211SJeremy Fitzhardinge 16620d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 16630d160211SJeremy Fitzhardinge return -EPERM; 16640d160211SJeremy Fitzhardinge 16650d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 16660d160211SJeremy Fitzhardinge if (endp == buf) 16670d160211SJeremy Fitzhardinge return -EBADMSG; 16680d160211SJeremy Fitzhardinge 16690d160211SJeremy Fitzhardinge if (target < RX_MIN_TARGET) 16700d160211SJeremy Fitzhardinge target = RX_MIN_TARGET; 16710d160211SJeremy Fitzhardinge if (target > RX_MAX_TARGET) 16720d160211SJeremy Fitzhardinge target = RX_MAX_TARGET; 16730d160211SJeremy Fitzhardinge 16740d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 16750d160211SJeremy Fitzhardinge if (target > np->rx_max_target) 16760d160211SJeremy Fitzhardinge np->rx_max_target = target; 16770d160211SJeremy Fitzhardinge np->rx_min_target = target; 16780d160211SJeremy Fitzhardinge if (target > np->rx_target) 16790d160211SJeremy Fitzhardinge np->rx_target = target; 16800d160211SJeremy Fitzhardinge 16810d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(netdev); 16820d160211SJeremy Fitzhardinge 16830d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 16840d160211SJeremy Fitzhardinge return len; 16850d160211SJeremy Fitzhardinge } 16860d160211SJeremy Fitzhardinge 16870d160211SJeremy Fitzhardinge static ssize_t show_rxbuf_max(struct device *dev, 16880d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 16890d160211SJeremy Fitzhardinge { 16900d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 16910d160211SJeremy Fitzhardinge struct netfront_info *info = netdev_priv(netdev); 16920d160211SJeremy Fitzhardinge 16930d160211SJeremy Fitzhardinge return sprintf(buf, "%u\n", info->rx_max_target); 16940d160211SJeremy Fitzhardinge } 16950d160211SJeremy Fitzhardinge 16960d160211SJeremy Fitzhardinge static ssize_t store_rxbuf_max(struct device *dev, 16970d160211SJeremy Fitzhardinge struct device_attribute *attr, 16980d160211SJeremy Fitzhardinge const char *buf, size_t len) 16990d160211SJeremy Fitzhardinge { 17000d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 17010d160211SJeremy Fitzhardinge struct netfront_info *np = netdev_priv(netdev); 17020d160211SJeremy Fitzhardinge char *endp; 17030d160211SJeremy Fitzhardinge unsigned long target; 17040d160211SJeremy Fitzhardinge 17050d160211SJeremy Fitzhardinge if (!capable(CAP_NET_ADMIN)) 17060d160211SJeremy Fitzhardinge return -EPERM; 17070d160211SJeremy Fitzhardinge 17080d160211SJeremy Fitzhardinge target = simple_strtoul(buf, &endp, 0); 17090d160211SJeremy Fitzhardinge if (endp == buf) 17100d160211SJeremy Fitzhardinge return -EBADMSG; 17110d160211SJeremy Fitzhardinge 17120d160211SJeremy Fitzhardinge if (target < RX_MIN_TARGET) 17130d160211SJeremy Fitzhardinge target = RX_MIN_TARGET; 17140d160211SJeremy Fitzhardinge if (target > RX_MAX_TARGET) 17150d160211SJeremy Fitzhardinge target = RX_MAX_TARGET; 17160d160211SJeremy Fitzhardinge 17170d160211SJeremy Fitzhardinge spin_lock_bh(&np->rx_lock); 17180d160211SJeremy Fitzhardinge if (target < np->rx_min_target) 17190d160211SJeremy Fitzhardinge np->rx_min_target = target; 17200d160211SJeremy Fitzhardinge np->rx_max_target = target; 17210d160211SJeremy Fitzhardinge if (target < np->rx_target) 17220d160211SJeremy Fitzhardinge np->rx_target = target; 17230d160211SJeremy Fitzhardinge 17240d160211SJeremy Fitzhardinge xennet_alloc_rx_buffers(netdev); 17250d160211SJeremy Fitzhardinge 17260d160211SJeremy Fitzhardinge spin_unlock_bh(&np->rx_lock); 17270d160211SJeremy Fitzhardinge return len; 17280d160211SJeremy Fitzhardinge } 17290d160211SJeremy Fitzhardinge 17300d160211SJeremy Fitzhardinge static ssize_t show_rxbuf_cur(struct device *dev, 17310d160211SJeremy Fitzhardinge struct device_attribute *attr, char *buf) 17320d160211SJeremy Fitzhardinge { 17330d160211SJeremy Fitzhardinge struct net_device *netdev = to_net_dev(dev); 17340d160211SJeremy Fitzhardinge struct netfront_info *info = netdev_priv(netdev); 17350d160211SJeremy Fitzhardinge 17360d160211SJeremy Fitzhardinge return sprintf(buf, "%u\n", info->rx_target); 17370d160211SJeremy Fitzhardinge } 17380d160211SJeremy Fitzhardinge 17390d160211SJeremy Fitzhardinge static struct device_attribute xennet_attrs[] = { 17400d160211SJeremy Fitzhardinge __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), 17410d160211SJeremy Fitzhardinge __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), 17420d160211SJeremy Fitzhardinge __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), 17430d160211SJeremy Fitzhardinge }; 17440d160211SJeremy Fitzhardinge 17450d160211SJeremy Fitzhardinge static int xennet_sysfs_addif(struct net_device *netdev) 17460d160211SJeremy Fitzhardinge { 17470d160211SJeremy Fitzhardinge int i; 17480d160211SJeremy Fitzhardinge int err; 17490d160211SJeremy Fitzhardinge 17500d160211SJeremy Fitzhardinge for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { 17510d160211SJeremy Fitzhardinge err = device_create_file(&netdev->dev, 17520d160211SJeremy Fitzhardinge &xennet_attrs[i]); 17530d160211SJeremy Fitzhardinge if (err) 17540d160211SJeremy Fitzhardinge goto fail; 17550d160211SJeremy Fitzhardinge } 17560d160211SJeremy Fitzhardinge return 0; 17570d160211SJeremy Fitzhardinge 17580d160211SJeremy Fitzhardinge fail: 17590d160211SJeremy Fitzhardinge while (--i >= 0) 17600d160211SJeremy Fitzhardinge device_remove_file(&netdev->dev, &xennet_attrs[i]); 17610d160211SJeremy Fitzhardinge return err; 17620d160211SJeremy Fitzhardinge } 17630d160211SJeremy Fitzhardinge 17640d160211SJeremy Fitzhardinge static void xennet_sysfs_delif(struct net_device *netdev) 17650d160211SJeremy Fitzhardinge { 17660d160211SJeremy Fitzhardinge int i; 17670d160211SJeremy Fitzhardinge 17680d160211SJeremy Fitzhardinge for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) 17690d160211SJeremy Fitzhardinge device_remove_file(&netdev->dev, &xennet_attrs[i]); 17700d160211SJeremy Fitzhardinge } 17710d160211SJeremy Fitzhardinge 17720d160211SJeremy Fitzhardinge #endif /* CONFIG_SYSFS */ 17730d160211SJeremy Fitzhardinge 17740d160211SJeremy Fitzhardinge static struct xenbus_device_id netfront_ids[] = { 17750d160211SJeremy Fitzhardinge { "vif" }, 17760d160211SJeremy Fitzhardinge { "" } 17770d160211SJeremy Fitzhardinge }; 17780d160211SJeremy Fitzhardinge 17790d160211SJeremy Fitzhardinge 17800d160211SJeremy Fitzhardinge static int __devexit xennet_remove(struct xenbus_device *dev) 17810d160211SJeremy Fitzhardinge { 17821b713e00SGreg Kroah-Hartman struct netfront_info *info = dev_get_drvdata(&dev->dev); 17830d160211SJeremy Fitzhardinge 17840d160211SJeremy Fitzhardinge dev_dbg(&dev->dev, "%s\n", dev->nodename); 17850d160211SJeremy Fitzhardinge 17860d160211SJeremy Fitzhardinge unregister_netdev(info->netdev); 17870d160211SJeremy Fitzhardinge 17880d160211SJeremy Fitzhardinge xennet_disconnect_backend(info); 17890d160211SJeremy Fitzhardinge 17900d160211SJeremy Fitzhardinge del_timer_sync(&info->rx_refill_timer); 17910d160211SJeremy Fitzhardinge 17920d160211SJeremy Fitzhardinge xennet_sysfs_delif(info->netdev); 17930d160211SJeremy Fitzhardinge 17940d160211SJeremy Fitzhardinge free_netdev(info->netdev); 17950d160211SJeremy Fitzhardinge 17960d160211SJeremy Fitzhardinge return 0; 17970d160211SJeremy Fitzhardinge } 17980d160211SJeremy Fitzhardinge 1799ffb78a26SAl Viro static struct xenbus_driver netfront_driver = { 18000d160211SJeremy Fitzhardinge .name = "vif", 18010d160211SJeremy Fitzhardinge .owner = THIS_MODULE, 18020d160211SJeremy Fitzhardinge .ids = netfront_ids, 18030d160211SJeremy Fitzhardinge .probe = netfront_probe, 18040d160211SJeremy Fitzhardinge .remove = __devexit_p(xennet_remove), 18050d160211SJeremy Fitzhardinge .resume = netfront_resume, 1806f502bf2bSIan Campbell .otherend_changed = netback_changed, 18070d160211SJeremy Fitzhardinge }; 18080d160211SJeremy Fitzhardinge 18090d160211SJeremy Fitzhardinge static int __init netif_init(void) 18100d160211SJeremy Fitzhardinge { 18116e833587SJeremy Fitzhardinge if (!xen_domain()) 18120d160211SJeremy Fitzhardinge return -ENODEV; 18130d160211SJeremy Fitzhardinge 18146e833587SJeremy Fitzhardinge if (xen_initial_domain()) 18150d160211SJeremy Fitzhardinge return 0; 18160d160211SJeremy Fitzhardinge 18170d160211SJeremy Fitzhardinge printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); 18180d160211SJeremy Fitzhardinge 1819ffb78a26SAl Viro return xenbus_register_frontend(&netfront_driver); 18200d160211SJeremy Fitzhardinge } 18210d160211SJeremy Fitzhardinge module_init(netif_init); 18220d160211SJeremy Fitzhardinge 18230d160211SJeremy Fitzhardinge 18240d160211SJeremy Fitzhardinge static void __exit netif_exit(void) 18250d160211SJeremy Fitzhardinge { 18266e833587SJeremy Fitzhardinge if (xen_initial_domain()) 18270d160211SJeremy Fitzhardinge return; 18280d160211SJeremy Fitzhardinge 1829ffb78a26SAl Viro xenbus_unregister_driver(&netfront_driver); 18300d160211SJeremy Fitzhardinge } 18310d160211SJeremy Fitzhardinge module_exit(netif_exit); 18320d160211SJeremy Fitzhardinge 18330d160211SJeremy Fitzhardinge MODULE_DESCRIPTION("Xen virtual network device frontend"); 18340d160211SJeremy Fitzhardinge MODULE_LICENSE("GPL"); 1835d2f0c52bSMark McLoughlin MODULE_ALIAS("xen:vif"); 18364f93f09bSMark McLoughlin MODULE_ALIAS("xennet"); 1837