Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Virtual network driver for conversing with remote driver backends. |
| 3 | * |
| 4 | * Copyright (c) 2002-2005, K A Fraser |
| 5 | * Copyright (c) 2005, XenSource Ltd |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version 2 |
| 9 | * as published by the Free Software Foundation; or, when distributed |
| 10 | * separately from the Linux kernel or incorporated into other |
| 11 | * software packages, subject to the following license: |
| 12 | * |
| 13 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 14 | * of this source file (the "Software"), to deal in the Software without |
| 15 | * restriction, including without limitation the rights to use, copy, modify, |
| 16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 17 | * and to permit persons to whom the Software is furnished to do so, subject to |
| 18 | * the following conditions: |
| 19 | * |
| 20 | * The above copyright notice and this permission notice shall be included in |
| 21 | * all copies or substantial portions of the Software. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 29 | * IN THE SOFTWARE. |
| 30 | */ |
| 31 | |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/netdevice.h> |
| 35 | #include <linux/etherdevice.h> |
| 36 | #include <linux/skbuff.h> |
| 37 | #include <linux/ethtool.h> |
| 38 | #include <linux/if_ether.h> |
| 39 | #include <linux/tcp.h> |
| 40 | #include <linux/udp.h> |
| 41 | #include <linux/moduleparam.h> |
| 42 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 43 | #include <linux/slab.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 44 | #include <net/ip.h> |
| 45 | |
Jeremy Fitzhardinge | 1ccbf53 | 2009-10-06 15:11:14 -0700 | [diff] [blame] | 46 | #include <xen/xen.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 47 | #include <xen/xenbus.h> |
| 48 | #include <xen/events.h> |
| 49 | #include <xen/page.h> |
Igor Mammedov | b9136d2 | 2012-03-21 15:08:38 +0100 | [diff] [blame] | 50 | #include <xen/platform_pci.h> |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 51 | #include <xen/grant_table.h> |
| 52 | |
| 53 | #include <xen/interface/io/netif.h> |
| 54 | #include <xen/interface/memory.h> |
| 55 | #include <xen/interface/grant_table.h> |
| 56 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 57 | static const struct ethtool_ops xennet_ethtool_ops; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 58 | |
| 59 | struct netfront_cb { |
| 60 | struct page *page; |
| 61 | unsigned offset; |
| 62 | }; |
| 63 | |
| 64 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) |
| 65 | |
| 66 | #define RX_COPY_THRESHOLD 256 |
| 67 | |
| 68 | #define GRANT_INVALID_REF 0 |
| 69 | |
Jeremy Fitzhardinge | 667c78af | 2010-12-08 12:39:12 -0800 | [diff] [blame] | 70 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) |
| 71 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) |
Wei Liu | 40206dd | 2012-01-26 07:23:23 +0000 | [diff] [blame] | 72 | #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 73 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 74 | struct netfront_stats { |
| 75 | u64 rx_packets; |
| 76 | u64 tx_packets; |
| 77 | u64 rx_bytes; |
| 78 | u64 tx_bytes; |
| 79 | struct u64_stats_sync syncp; |
| 80 | }; |
| 81 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 82 | struct netfront_info { |
| 83 | struct list_head list; |
| 84 | struct net_device *netdev; |
| 85 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 86 | struct napi_struct napi; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 87 | |
Jeremy Fitzhardinge | 84284d3 | 2007-10-15 12:59:53 -0700 | [diff] [blame] | 88 | unsigned int evtchn; |
| 89 | struct xenbus_device *xbdev; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 90 | |
| 91 | spinlock_t tx_lock; |
Jeremy Fitzhardinge | 84284d3 | 2007-10-15 12:59:53 -0700 | [diff] [blame] | 92 | struct xen_netif_tx_front_ring tx; |
| 93 | int tx_ring_ref; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 94 | |
| 95 | /* |
| 96 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries |
| 97 | * are linked from tx_skb_freelist through skb_entry.link. |
| 98 | * |
| 99 | * NB. Freelist index entries are always going to be less than |
| 100 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or |
| 101 | * greater than PAGE_OFFSET: we use this property to distinguish |
| 102 | * them. |
| 103 | */ |
| 104 | union skb_entry { |
| 105 | struct sk_buff *skb; |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 106 | unsigned long link; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 107 | } tx_skbs[NET_TX_RING_SIZE]; |
| 108 | grant_ref_t gref_tx_head; |
| 109 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; |
| 110 | unsigned tx_skb_freelist; |
| 111 | |
Jeremy Fitzhardinge | 84284d3 | 2007-10-15 12:59:53 -0700 | [diff] [blame] | 112 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
| 113 | struct xen_netif_rx_front_ring rx; |
| 114 | int rx_ring_ref; |
| 115 | |
| 116 | /* Receive-ring batched refills. */ |
| 117 | #define RX_MIN_TARGET 8 |
| 118 | #define RX_DFL_MIN_TARGET 64 |
| 119 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) |
| 120 | unsigned rx_min_target, rx_max_target, rx_target; |
| 121 | struct sk_buff_head rx_batch; |
| 122 | |
| 123 | struct timer_list rx_refill_timer; |
| 124 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 125 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
| 126 | grant_ref_t gref_rx_head; |
| 127 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; |
| 128 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 129 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
| 130 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; |
| 131 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 132 | |
| 133 | /* Statistics */ |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 134 | struct netfront_stats __percpu *stats; |
| 135 | |
Ian Campbell | e9a799e | 2011-03-10 07:04:18 +0000 | [diff] [blame] | 136 | unsigned long rx_gso_checksum_fixup; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | struct netfront_rx_info { |
| 140 | struct xen_netif_rx_response rx; |
| 141 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; |
| 142 | }; |
| 143 | |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 144 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
| 145 | { |
| 146 | list->link = id; |
| 147 | } |
| 148 | |
| 149 | static int skb_entry_is_link(const union skb_entry *list) |
| 150 | { |
| 151 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); |
Eric Dumazet | 807540b | 2010-09-23 05:40:09 +0000 | [diff] [blame] | 152 | return (unsigned long)list->skb < PAGE_OFFSET; |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 153 | } |
| 154 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 155 | /* |
| 156 | * Access macros for acquiring freeing slots in tx_skbs[]. |
| 157 | */ |
| 158 | |
| 159 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, |
| 160 | unsigned short id) |
| 161 | { |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 162 | skb_entry_set_link(&list[id], *head); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 163 | *head = id; |
| 164 | } |
| 165 | |
| 166 | static unsigned short get_id_from_freelist(unsigned *head, |
| 167 | union skb_entry *list) |
| 168 | { |
| 169 | unsigned int id = *head; |
| 170 | *head = list[id].link; |
| 171 | return id; |
| 172 | } |
| 173 | |
| 174 | static int xennet_rxidx(RING_IDX idx) |
| 175 | { |
| 176 | return idx & (NET_RX_RING_SIZE - 1); |
| 177 | } |
| 178 | |
| 179 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, |
| 180 | RING_IDX ri) |
| 181 | { |
| 182 | int i = xennet_rxidx(ri); |
| 183 | struct sk_buff *skb = np->rx_skbs[i]; |
| 184 | np->rx_skbs[i] = NULL; |
| 185 | return skb; |
| 186 | } |
| 187 | |
| 188 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, |
| 189 | RING_IDX ri) |
| 190 | { |
| 191 | int i = xennet_rxidx(ri); |
| 192 | grant_ref_t ref = np->grant_rx_ref[i]; |
| 193 | np->grant_rx_ref[i] = GRANT_INVALID_REF; |
| 194 | return ref; |
| 195 | } |
| 196 | |
| 197 | #ifdef CONFIG_SYSFS |
| 198 | static int xennet_sysfs_addif(struct net_device *netdev); |
| 199 | static void xennet_sysfs_delif(struct net_device *netdev); |
| 200 | #else /* !CONFIG_SYSFS */ |
| 201 | #define xennet_sysfs_addif(dev) (0) |
| 202 | #define xennet_sysfs_delif(dev) do { } while (0) |
| 203 | #endif |
| 204 | |
Michał Mirosław | 3ad9b35 | 2011-11-16 14:05:33 +0000 | [diff] [blame] | 205 | static bool xennet_can_sg(struct net_device *dev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 206 | { |
Michał Mirosław | 3ad9b35 | 2011-11-16 14:05:33 +0000 | [diff] [blame] | 207 | return dev->features & NETIF_F_SG; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | |
| 211 | static void rx_refill_timeout(unsigned long data) |
| 212 | { |
| 213 | struct net_device *dev = (struct net_device *)data; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 214 | struct netfront_info *np = netdev_priv(dev); |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 215 | napi_schedule(&np->napi); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | static int netfront_tx_slot_available(struct netfront_info *np) |
| 219 | { |
Eric Dumazet | 807540b | 2010-09-23 05:40:09 +0000 | [diff] [blame] | 220 | return (np->tx.req_prod_pvt - np->tx.rsp_cons) < |
| 221 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | static void xennet_maybe_wake_tx(struct net_device *dev) |
| 225 | { |
| 226 | struct netfront_info *np = netdev_priv(dev); |
| 227 | |
| 228 | if (unlikely(netif_queue_stopped(dev)) && |
| 229 | netfront_tx_slot_available(np) && |
| 230 | likely(netif_running(dev))) |
| 231 | netif_wake_queue(dev); |
| 232 | } |
| 233 | |
| 234 | static void xennet_alloc_rx_buffers(struct net_device *dev) |
| 235 | { |
| 236 | unsigned short id; |
| 237 | struct netfront_info *np = netdev_priv(dev); |
| 238 | struct sk_buff *skb; |
| 239 | struct page *page; |
| 240 | int i, batch_target, notify; |
| 241 | RING_IDX req_prod = np->rx.req_prod_pvt; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 242 | grant_ref_t ref; |
| 243 | unsigned long pfn; |
| 244 | void *vaddr; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 245 | struct xen_netif_rx_request *req; |
| 246 | |
| 247 | if (unlikely(!netif_carrier_ok(dev))) |
| 248 | return; |
| 249 | |
| 250 | /* |
| 251 | * Allocate skbuffs greedily, even though we batch updates to the |
| 252 | * receive ring. This creates a less bursty demand on the memory |
| 253 | * allocator, so should reduce the chance of failed allocation requests |
| 254 | * both for ourself and for other kernel subsystems. |
| 255 | */ |
| 256 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); |
| 257 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { |
Isaku Yamahata | 617a20b | 2008-10-14 17:50:42 -0700 | [diff] [blame] | 258 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 259 | GFP_ATOMIC | __GFP_NOWARN); |
| 260 | if (unlikely(!skb)) |
| 261 | goto no_skb; |
| 262 | |
Isaku Yamahata | 617a20b | 2008-10-14 17:50:42 -0700 | [diff] [blame] | 263 | /* Align ip header to a 16 bytes boundary */ |
| 264 | skb_reserve(skb, NET_IP_ALIGN); |
| 265 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 266 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
| 267 | if (!page) { |
| 268 | kfree_skb(skb); |
| 269 | no_skb: |
| 270 | /* Any skbuffs queued for refill? Force them out. */ |
| 271 | if (i != 0) |
| 272 | goto refill; |
| 273 | /* Could not allocate any skbuffs. Try again later. */ |
| 274 | mod_timer(&np->rx_refill_timer, |
| 275 | jiffies + (HZ/10)); |
| 276 | break; |
| 277 | } |
| 278 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 279 | __skb_fill_page_desc(skb, 0, page, 0, 0); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 280 | skb_shinfo(skb)->nr_frags = 1; |
| 281 | __skb_queue_tail(&np->rx_batch, skb); |
| 282 | } |
| 283 | |
| 284 | /* Is the batch large enough to be worthwhile? */ |
| 285 | if (i < (np->rx_target/2)) { |
| 286 | if (req_prod > np->rx.sring->req_prod) |
| 287 | goto push; |
| 288 | return; |
| 289 | } |
| 290 | |
| 291 | /* Adjust our fill target if we risked running out of buffers. */ |
| 292 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && |
| 293 | ((np->rx_target *= 2) > np->rx_max_target)) |
| 294 | np->rx_target = np->rx_max_target; |
| 295 | |
| 296 | refill: |
Jeremy Fitzhardinge | 5dcddfa | 2007-08-07 14:56:42 -0700 | [diff] [blame] | 297 | for (i = 0; ; i++) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 298 | skb = __skb_dequeue(&np->rx_batch); |
| 299 | if (skb == NULL) |
| 300 | break; |
| 301 | |
| 302 | skb->dev = dev; |
| 303 | |
| 304 | id = xennet_rxidx(req_prod + i); |
| 305 | |
| 306 | BUG_ON(np->rx_skbs[id]); |
| 307 | np->rx_skbs[id] = skb; |
| 308 | |
| 309 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); |
| 310 | BUG_ON((signed short)ref < 0); |
| 311 | np->grant_rx_ref[id] = ref; |
| 312 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 313 | pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
| 314 | vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 315 | |
| 316 | req = RING_GET_REQUEST(&np->rx, req_prod + i); |
| 317 | gnttab_grant_foreign_access_ref(ref, |
| 318 | np->xbdev->otherend_id, |
| 319 | pfn_to_mfn(pfn), |
| 320 | 0); |
| 321 | |
| 322 | req->id = id; |
| 323 | req->gref = ref; |
| 324 | } |
| 325 | |
Jeremy Fitzhardinge | 5dcddfa | 2007-08-07 14:56:42 -0700 | [diff] [blame] | 326 | wmb(); /* barrier so backend seens requests */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 327 | |
| 328 | /* Above is a suitable barrier to ensure backend will see requests. */ |
| 329 | np->rx.req_prod_pvt = req_prod + i; |
| 330 | push: |
| 331 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); |
| 332 | if (notify) |
| 333 | notify_remote_via_irq(np->netdev->irq); |
| 334 | } |
| 335 | |
| 336 | static int xennet_open(struct net_device *dev) |
| 337 | { |
| 338 | struct netfront_info *np = netdev_priv(dev); |
| 339 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 340 | napi_enable(&np->napi); |
| 341 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 342 | spin_lock_bh(&np->rx_lock); |
| 343 | if (netif_carrier_ok(dev)) { |
| 344 | xennet_alloc_rx_buffers(dev); |
| 345 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; |
| 346 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 347 | napi_schedule(&np->napi); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 348 | } |
| 349 | spin_unlock_bh(&np->rx_lock); |
| 350 | |
Eduardo Habkost | 0b1ab1b | 2008-07-31 17:36:55 -0300 | [diff] [blame] | 351 | netif_start_queue(dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 352 | |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | static void xennet_tx_buf_gc(struct net_device *dev) |
| 357 | { |
| 358 | RING_IDX cons, prod; |
| 359 | unsigned short id; |
| 360 | struct netfront_info *np = netdev_priv(dev); |
| 361 | struct sk_buff *skb; |
| 362 | |
| 363 | BUG_ON(!netif_carrier_ok(dev)); |
| 364 | |
| 365 | do { |
| 366 | prod = np->tx.sring->rsp_prod; |
| 367 | rmb(); /* Ensure we see responses up to 'rp'. */ |
| 368 | |
| 369 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { |
| 370 | struct xen_netif_tx_response *txrsp; |
| 371 | |
| 372 | txrsp = RING_GET_RESPONSE(&np->tx, cons); |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 373 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 374 | continue; |
| 375 | |
| 376 | id = txrsp->id; |
| 377 | skb = np->tx_skbs[id].skb; |
| 378 | if (unlikely(gnttab_query_foreign_access( |
| 379 | np->grant_tx_ref[id]) != 0)) { |
| 380 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " |
| 381 | "-- grant still in use by backend " |
| 382 | "domain.\n"); |
| 383 | BUG(); |
| 384 | } |
| 385 | gnttab_end_foreign_access_ref( |
| 386 | np->grant_tx_ref[id], GNTMAP_readonly); |
| 387 | gnttab_release_grant_reference( |
| 388 | &np->gref_tx_head, np->grant_tx_ref[id]); |
| 389 | np->grant_tx_ref[id] = GRANT_INVALID_REF; |
| 390 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); |
| 391 | dev_kfree_skb_irq(skb); |
| 392 | } |
| 393 | |
| 394 | np->tx.rsp_cons = prod; |
| 395 | |
| 396 | /* |
| 397 | * Set a new event, then check for race with update of tx_cons. |
| 398 | * Note that it is essential to schedule a callback, no matter |
| 399 | * how few buffers are pending. Even if there is space in the |
| 400 | * transmit ring, higher layers may be blocked because too much |
| 401 | * data is outstanding: in such cases notification from Xen is |
| 402 | * likely to be the only kick that we'll get. |
| 403 | */ |
| 404 | np->tx.sring->rsp_event = |
| 405 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; |
| 406 | mb(); /* update shared area */ |
| 407 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); |
| 408 | |
| 409 | xennet_maybe_wake_tx(dev); |
| 410 | } |
| 411 | |
| 412 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, |
| 413 | struct xen_netif_tx_request *tx) |
| 414 | { |
| 415 | struct netfront_info *np = netdev_priv(dev); |
| 416 | char *data = skb->data; |
| 417 | unsigned long mfn; |
| 418 | RING_IDX prod = np->tx.req_prod_pvt; |
| 419 | int frags = skb_shinfo(skb)->nr_frags; |
| 420 | unsigned int offset = offset_in_page(data); |
| 421 | unsigned int len = skb_headlen(skb); |
| 422 | unsigned int id; |
| 423 | grant_ref_t ref; |
| 424 | int i; |
| 425 | |
| 426 | /* While the header overlaps a page boundary (including being |
| 427 | larger than a page), split it it into page-sized chunks. */ |
| 428 | while (len > PAGE_SIZE - offset) { |
| 429 | tx->size = PAGE_SIZE - offset; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 430 | tx->flags |= XEN_NETTXF_more_data; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 431 | len -= tx->size; |
| 432 | data += tx->size; |
| 433 | offset = 0; |
| 434 | |
| 435 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); |
| 436 | np->tx_skbs[id].skb = skb_get(skb); |
| 437 | tx = RING_GET_REQUEST(&np->tx, prod++); |
| 438 | tx->id = id; |
| 439 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); |
| 440 | BUG_ON((signed short)ref < 0); |
| 441 | |
| 442 | mfn = virt_to_mfn(data); |
| 443 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, |
| 444 | mfn, GNTMAP_readonly); |
| 445 | |
| 446 | tx->gref = np->grant_tx_ref[id] = ref; |
| 447 | tx->offset = offset; |
| 448 | tx->size = len; |
| 449 | tx->flags = 0; |
| 450 | } |
| 451 | |
| 452 | /* Grant backend access to each skb fragment page. */ |
| 453 | for (i = 0; i < frags; i++) { |
| 454 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; |
| 455 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 456 | tx->flags |= XEN_NETTXF_more_data; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 457 | |
| 458 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); |
| 459 | np->tx_skbs[id].skb = skb_get(skb); |
| 460 | tx = RING_GET_REQUEST(&np->tx, prod++); |
| 461 | tx->id = id; |
| 462 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); |
| 463 | BUG_ON((signed short)ref < 0); |
| 464 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 465 | mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag))); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 466 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, |
| 467 | mfn, GNTMAP_readonly); |
| 468 | |
| 469 | tx->gref = np->grant_tx_ref[id] = ref; |
| 470 | tx->offset = frag->page_offset; |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 471 | tx->size = skb_frag_size(frag); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 472 | tx->flags = 0; |
| 473 | } |
| 474 | |
| 475 | np->tx.req_prod_pvt = prod; |
| 476 | } |
| 477 | |
| 478 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 479 | { |
| 480 | unsigned short id; |
| 481 | struct netfront_info *np = netdev_priv(dev); |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 482 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 483 | struct xen_netif_tx_request *tx; |
| 484 | struct xen_netif_extra_info *extra; |
| 485 | char *data = skb->data; |
| 486 | RING_IDX i; |
| 487 | grant_ref_t ref; |
| 488 | unsigned long mfn; |
| 489 | int notify; |
| 490 | int frags = skb_shinfo(skb)->nr_frags; |
| 491 | unsigned int offset = offset_in_page(data); |
| 492 | unsigned int len = skb_headlen(skb); |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 493 | unsigned long flags; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 494 | |
Julia Lawall | 4352637 | 2008-10-15 22:05:23 -0700 | [diff] [blame] | 495 | frags += DIV_ROUND_UP(offset + len, PAGE_SIZE); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 496 | if (unlikely(frags > MAX_SKB_FRAGS + 1)) { |
| 497 | printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", |
| 498 | frags); |
| 499 | dump_stack(); |
| 500 | goto drop; |
| 501 | } |
| 502 | |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 503 | spin_lock_irqsave(&np->tx_lock, flags); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 504 | |
| 505 | if (unlikely(!netif_carrier_ok(dev) || |
| 506 | (frags > 1 && !xennet_can_sg(dev)) || |
Jesse Gross | fc74121 | 2011-01-09 06:23:32 +0000 | [diff] [blame] | 507 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 508 | spin_unlock_irqrestore(&np->tx_lock, flags); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 509 | goto drop; |
| 510 | } |
| 511 | |
| 512 | i = np->tx.req_prod_pvt; |
| 513 | |
| 514 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); |
| 515 | np->tx_skbs[id].skb = skb; |
| 516 | |
| 517 | tx = RING_GET_REQUEST(&np->tx, i); |
| 518 | |
| 519 | tx->id = id; |
| 520 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); |
| 521 | BUG_ON((signed short)ref < 0); |
| 522 | mfn = virt_to_mfn(data); |
| 523 | gnttab_grant_foreign_access_ref( |
| 524 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); |
| 525 | tx->gref = np->grant_tx_ref[id] = ref; |
| 526 | tx->offset = offset; |
| 527 | tx->size = len; |
| 528 | extra = NULL; |
| 529 | |
| 530 | tx->flags = 0; |
| 531 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 532 | /* local packet? */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 533 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 534 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
| 535 | /* remote but checksummed. */ |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 536 | tx->flags |= XEN_NETTXF_data_validated; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 537 | |
| 538 | if (skb_shinfo(skb)->gso_size) { |
| 539 | struct xen_netif_extra_info *gso; |
| 540 | |
| 541 | gso = (struct xen_netif_extra_info *) |
| 542 | RING_GET_REQUEST(&np->tx, ++i); |
| 543 | |
| 544 | if (extra) |
| 545 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; |
| 546 | else |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 547 | tx->flags |= XEN_NETTXF_extra_info; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 548 | |
| 549 | gso->u.gso.size = skb_shinfo(skb)->gso_size; |
| 550 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; |
| 551 | gso->u.gso.pad = 0; |
| 552 | gso->u.gso.features = 0; |
| 553 | |
| 554 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; |
| 555 | gso->flags = 0; |
| 556 | extra = gso; |
| 557 | } |
| 558 | |
| 559 | np->tx.req_prod_pvt = i + 1; |
| 560 | |
| 561 | xennet_make_frags(skb, dev, tx); |
| 562 | tx->size = skb->len; |
| 563 | |
| 564 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); |
| 565 | if (notify) |
| 566 | notify_remote_via_irq(np->netdev->irq); |
| 567 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 568 | u64_stats_update_begin(&stats->syncp); |
| 569 | stats->tx_bytes += skb->len; |
| 570 | stats->tx_packets++; |
| 571 | u64_stats_update_end(&stats->syncp); |
Jeremy Fitzhardinge | 10a273a | 2007-08-13 12:54:37 -0700 | [diff] [blame] | 572 | |
| 573 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 574 | xennet_tx_buf_gc(dev); |
| 575 | |
| 576 | if (!netfront_tx_slot_available(np)) |
| 577 | netif_stop_queue(dev); |
| 578 | |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 579 | spin_unlock_irqrestore(&np->tx_lock, flags); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 580 | |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 581 | return NETDEV_TX_OK; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 582 | |
| 583 | drop: |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 584 | dev->stats.tx_dropped++; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 585 | dev_kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 586 | return NETDEV_TX_OK; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | static int xennet_close(struct net_device *dev) |
| 590 | { |
| 591 | struct netfront_info *np = netdev_priv(dev); |
| 592 | netif_stop_queue(np->netdev); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 593 | napi_disable(&np->napi); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 594 | return 0; |
| 595 | } |
| 596 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 597 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
| 598 | grant_ref_t ref) |
| 599 | { |
| 600 | int new = xennet_rxidx(np->rx.req_prod_pvt); |
| 601 | |
| 602 | BUG_ON(np->rx_skbs[new]); |
| 603 | np->rx_skbs[new] = skb; |
| 604 | np->grant_rx_ref[new] = ref; |
| 605 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; |
| 606 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; |
| 607 | np->rx.req_prod_pvt++; |
| 608 | } |
| 609 | |
| 610 | static int xennet_get_extras(struct netfront_info *np, |
| 611 | struct xen_netif_extra_info *extras, |
| 612 | RING_IDX rp) |
| 613 | |
| 614 | { |
| 615 | struct xen_netif_extra_info *extra; |
| 616 | struct device *dev = &np->netdev->dev; |
| 617 | RING_IDX cons = np->rx.rsp_cons; |
| 618 | int err = 0; |
| 619 | |
| 620 | do { |
| 621 | struct sk_buff *skb; |
| 622 | grant_ref_t ref; |
| 623 | |
| 624 | if (unlikely(cons + 1 == rp)) { |
| 625 | if (net_ratelimit()) |
| 626 | dev_warn(dev, "Missing extra info\n"); |
| 627 | err = -EBADR; |
| 628 | break; |
| 629 | } |
| 630 | |
| 631 | extra = (struct xen_netif_extra_info *) |
| 632 | RING_GET_RESPONSE(&np->rx, ++cons); |
| 633 | |
| 634 | if (unlikely(!extra->type || |
| 635 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { |
| 636 | if (net_ratelimit()) |
| 637 | dev_warn(dev, "Invalid extra type: %d\n", |
| 638 | extra->type); |
| 639 | err = -EINVAL; |
| 640 | } else { |
| 641 | memcpy(&extras[extra->type - 1], extra, |
| 642 | sizeof(*extra)); |
| 643 | } |
| 644 | |
| 645 | skb = xennet_get_rx_skb(np, cons); |
| 646 | ref = xennet_get_rx_ref(np, cons); |
| 647 | xennet_move_rx_slot(np, skb, ref); |
| 648 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); |
| 649 | |
| 650 | np->rx.rsp_cons = cons; |
| 651 | return err; |
| 652 | } |
| 653 | |
| 654 | static int xennet_get_responses(struct netfront_info *np, |
| 655 | struct netfront_rx_info *rinfo, RING_IDX rp, |
| 656 | struct sk_buff_head *list) |
| 657 | { |
| 658 | struct xen_netif_rx_response *rx = &rinfo->rx; |
| 659 | struct xen_netif_extra_info *extras = rinfo->extras; |
| 660 | struct device *dev = &np->netdev->dev; |
| 661 | RING_IDX cons = np->rx.rsp_cons; |
| 662 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); |
| 663 | grant_ref_t ref = xennet_get_rx_ref(np, cons); |
| 664 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); |
| 665 | int frags = 1; |
| 666 | int err = 0; |
| 667 | unsigned long ret; |
| 668 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 669 | if (rx->flags & XEN_NETRXF_extra_info) { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 670 | err = xennet_get_extras(np, extras, rp); |
| 671 | cons = np->rx.rsp_cons; |
| 672 | } |
| 673 | |
| 674 | for (;;) { |
| 675 | if (unlikely(rx->status < 0 || |
| 676 | rx->offset + rx->status > PAGE_SIZE)) { |
| 677 | if (net_ratelimit()) |
| 678 | dev_warn(dev, "rx->offset: %x, size: %u\n", |
| 679 | rx->offset, rx->status); |
| 680 | xennet_move_rx_slot(np, skb, ref); |
| 681 | err = -EINVAL; |
| 682 | goto next; |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * This definitely indicates a bug, either in this driver or in |
| 687 | * the backend driver. In future this should flag the bad |
| 688 | * situation to the system controller to reboot the backed. |
| 689 | */ |
| 690 | if (ref == GRANT_INVALID_REF) { |
| 691 | if (net_ratelimit()) |
| 692 | dev_warn(dev, "Bad rx response id %d.\n", |
| 693 | rx->id); |
| 694 | err = -EINVAL; |
| 695 | goto next; |
| 696 | } |
| 697 | |
| 698 | ret = gnttab_end_foreign_access_ref(ref, 0); |
| 699 | BUG_ON(!ret); |
| 700 | |
| 701 | gnttab_release_grant_reference(&np->gref_rx_head, ref); |
| 702 | |
| 703 | __skb_queue_tail(list, skb); |
| 704 | |
| 705 | next: |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 706 | if (!(rx->flags & XEN_NETRXF_more_data)) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 707 | break; |
| 708 | |
| 709 | if (cons + frags == rp) { |
| 710 | if (net_ratelimit()) |
| 711 | dev_warn(dev, "Need more frags\n"); |
| 712 | err = -ENOENT; |
| 713 | break; |
| 714 | } |
| 715 | |
| 716 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); |
| 717 | skb = xennet_get_rx_skb(np, cons + frags); |
| 718 | ref = xennet_get_rx_ref(np, cons + frags); |
| 719 | frags++; |
| 720 | } |
| 721 | |
| 722 | if (unlikely(frags > max)) { |
| 723 | if (net_ratelimit()) |
| 724 | dev_warn(dev, "Too many frags\n"); |
| 725 | err = -E2BIG; |
| 726 | } |
| 727 | |
| 728 | if (unlikely(err)) |
| 729 | np->rx.rsp_cons = cons + frags; |
| 730 | |
| 731 | return err; |
| 732 | } |
| 733 | |
| 734 | static int xennet_set_skb_gso(struct sk_buff *skb, |
| 735 | struct xen_netif_extra_info *gso) |
| 736 | { |
| 737 | if (!gso->u.gso.size) { |
| 738 | if (net_ratelimit()) |
| 739 | printk(KERN_WARNING "GSO size must not be zero.\n"); |
| 740 | return -EINVAL; |
| 741 | } |
| 742 | |
| 743 | /* Currently only TCPv4 S.O. is supported. */ |
| 744 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { |
| 745 | if (net_ratelimit()) |
| 746 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); |
| 747 | return -EINVAL; |
| 748 | } |
| 749 | |
| 750 | skb_shinfo(skb)->gso_size = gso->u.gso.size; |
| 751 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 752 | |
| 753 | /* Header must be checked, and gso_segs computed. */ |
| 754 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 755 | skb_shinfo(skb)->gso_segs = 0; |
| 756 | |
| 757 | return 0; |
| 758 | } |
| 759 | |
| 760 | static RING_IDX xennet_fill_frags(struct netfront_info *np, |
| 761 | struct sk_buff *skb, |
| 762 | struct sk_buff_head *list) |
| 763 | { |
| 764 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
| 765 | int nr_frags = shinfo->nr_frags; |
| 766 | RING_IDX cons = np->rx.rsp_cons; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 767 | struct sk_buff *nskb; |
| 768 | |
| 769 | while ((nskb = __skb_dequeue(list))) { |
| 770 | struct xen_netif_rx_response *rx = |
| 771 | RING_GET_RESPONSE(&np->rx, ++cons); |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 772 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 773 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 774 | __skb_fill_page_desc(skb, nr_frags, |
| 775 | skb_frag_page(nfrag), |
| 776 | rx->offset, rx->status); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 777 | |
| 778 | skb->data_len += rx->status; |
| 779 | |
| 780 | skb_shinfo(nskb)->nr_frags = 0; |
| 781 | kfree_skb(nskb); |
| 782 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 783 | nr_frags++; |
| 784 | } |
| 785 | |
| 786 | shinfo->nr_frags = nr_frags; |
| 787 | return cons; |
| 788 | } |
| 789 | |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 790 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 791 | { |
| 792 | struct iphdr *iph; |
| 793 | unsigned char *th; |
| 794 | int err = -EPROTO; |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 795 | int recalculate_partial_csum = 0; |
| 796 | |
| 797 | /* |
| 798 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy |
| 799 | * peers can fail to set NETRXF_csum_blank when sending a GSO |
| 800 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and |
| 801 | * recalculate the partial checksum. |
| 802 | */ |
| 803 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { |
| 804 | struct netfront_info *np = netdev_priv(dev); |
| 805 | np->rx_gso_checksum_fixup++; |
| 806 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 807 | recalculate_partial_csum = 1; |
| 808 | } |
| 809 | |
| 810 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ |
| 811 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
| 812 | return 0; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 813 | |
| 814 | if (skb->protocol != htons(ETH_P_IP)) |
| 815 | goto out; |
| 816 | |
| 817 | iph = (void *)skb->data; |
| 818 | th = skb->data + 4 * iph->ihl; |
| 819 | if (th >= skb_tail_pointer(skb)) |
| 820 | goto out; |
| 821 | |
| 822 | skb->csum_start = th - skb->head; |
| 823 | switch (iph->protocol) { |
| 824 | case IPPROTO_TCP: |
| 825 | skb->csum_offset = offsetof(struct tcphdr, check); |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 826 | |
| 827 | if (recalculate_partial_csum) { |
| 828 | struct tcphdr *tcph = (struct tcphdr *)th; |
| 829 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
| 830 | skb->len - iph->ihl*4, |
| 831 | IPPROTO_TCP, 0); |
| 832 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 833 | break; |
| 834 | case IPPROTO_UDP: |
| 835 | skb->csum_offset = offsetof(struct udphdr, check); |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 836 | |
| 837 | if (recalculate_partial_csum) { |
| 838 | struct udphdr *udph = (struct udphdr *)th; |
| 839 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
| 840 | skb->len - iph->ihl*4, |
| 841 | IPPROTO_UDP, 0); |
| 842 | } |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 843 | break; |
| 844 | default: |
| 845 | if (net_ratelimit()) |
| 846 | printk(KERN_ERR "Attempting to checksum a non-" |
| 847 | "TCP/UDP packet, dropping a protocol" |
| 848 | " %d packet", iph->protocol); |
| 849 | goto out; |
| 850 | } |
| 851 | |
| 852 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) |
| 853 | goto out; |
| 854 | |
| 855 | err = 0; |
| 856 | |
| 857 | out: |
| 858 | return err; |
| 859 | } |
| 860 | |
| 861 | static int handle_incoming_queue(struct net_device *dev, |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 862 | struct sk_buff_head *rxq) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 863 | { |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 864 | struct netfront_info *np = netdev_priv(dev); |
| 865 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 866 | int packets_dropped = 0; |
| 867 | struct sk_buff *skb; |
| 868 | |
| 869 | while ((skb = __skb_dequeue(rxq)) != NULL) { |
| 870 | struct page *page = NETFRONT_SKB_CB(skb)->page; |
| 871 | void *vaddr = page_address(page); |
| 872 | unsigned offset = NETFRONT_SKB_CB(skb)->offset; |
| 873 | |
| 874 | memcpy(skb->data, vaddr + offset, |
| 875 | skb_headlen(skb)); |
| 876 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 877 | if (page != skb_frag_page(&skb_shinfo(skb)->frags[0])) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 878 | __free_page(page); |
| 879 | |
| 880 | /* Ethernet work: Delayed to here as it peeks the header. */ |
| 881 | skb->protocol = eth_type_trans(skb, dev); |
| 882 | |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 883 | if (checksum_setup(dev, skb)) { |
| 884 | kfree_skb(skb); |
| 885 | packets_dropped++; |
| 886 | dev->stats.rx_errors++; |
| 887 | continue; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 888 | } |
| 889 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 890 | u64_stats_update_begin(&stats->syncp); |
| 891 | stats->rx_packets++; |
| 892 | stats->rx_bytes += skb->len; |
| 893 | u64_stats_update_end(&stats->syncp); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 894 | |
| 895 | /* Pass it up. */ |
| 896 | netif_receive_skb(skb); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | return packets_dropped; |
| 900 | } |
| 901 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 902 | static int xennet_poll(struct napi_struct *napi, int budget) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 903 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 904 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
| 905 | struct net_device *dev = np->netdev; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 906 | struct sk_buff *skb; |
| 907 | struct netfront_rx_info rinfo; |
| 908 | struct xen_netif_rx_response *rx = &rinfo.rx; |
| 909 | struct xen_netif_extra_info *extras = rinfo.extras; |
| 910 | RING_IDX i, rp; |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 911 | int work_done; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 912 | struct sk_buff_head rxq; |
| 913 | struct sk_buff_head errq; |
| 914 | struct sk_buff_head tmpq; |
| 915 | unsigned long flags; |
| 916 | unsigned int len; |
| 917 | int err; |
| 918 | |
| 919 | spin_lock(&np->rx_lock); |
| 920 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 921 | skb_queue_head_init(&rxq); |
| 922 | skb_queue_head_init(&errq); |
| 923 | skb_queue_head_init(&tmpq); |
| 924 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 925 | rp = np->rx.sring->rsp_prod; |
| 926 | rmb(); /* Ensure we see queued responses up to 'rp'. */ |
| 927 | |
| 928 | i = np->rx.rsp_cons; |
| 929 | work_done = 0; |
| 930 | while ((i != rp) && (work_done < budget)) { |
| 931 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); |
| 932 | memset(extras, 0, sizeof(rinfo.extras)); |
| 933 | |
| 934 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); |
| 935 | |
| 936 | if (unlikely(err)) { |
| 937 | err: |
| 938 | while ((skb = __skb_dequeue(&tmpq))) |
| 939 | __skb_queue_tail(&errq, skb); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 940 | dev->stats.rx_errors++; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 941 | i = np->rx.rsp_cons; |
| 942 | continue; |
| 943 | } |
| 944 | |
| 945 | skb = __skb_dequeue(&tmpq); |
| 946 | |
| 947 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
| 948 | struct xen_netif_extra_info *gso; |
| 949 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; |
| 950 | |
| 951 | if (unlikely(xennet_set_skb_gso(skb, gso))) { |
| 952 | __skb_queue_head(&tmpq, skb); |
| 953 | np->rx.rsp_cons += skb_queue_len(&tmpq); |
| 954 | goto err; |
| 955 | } |
| 956 | } |
| 957 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 958 | NETFRONT_SKB_CB(skb)->page = |
| 959 | skb_frag_page(&skb_shinfo(skb)->frags[0]); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 960 | NETFRONT_SKB_CB(skb)->offset = rx->offset; |
| 961 | |
| 962 | len = rx->status; |
| 963 | if (len > RX_COPY_THRESHOLD) |
| 964 | len = RX_COPY_THRESHOLD; |
| 965 | skb_put(skb, len); |
| 966 | |
| 967 | if (rx->status > len) { |
| 968 | skb_shinfo(skb)->frags[0].page_offset = |
| 969 | rx->offset + len; |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 970 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status - len); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 971 | skb->data_len = rx->status - len; |
| 972 | } else { |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 973 | __skb_fill_page_desc(skb, 0, NULL, 0, 0); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 974 | skb_shinfo(skb)->nr_frags = 0; |
| 975 | } |
| 976 | |
| 977 | i = xennet_fill_frags(np, skb, &tmpq); |
| 978 | |
| 979 | /* |
| 980 | * Truesize approximates the size of true data plus |
| 981 | * any supervisor overheads. Adding hypervisor |
| 982 | * overheads has been shown to significantly reduce |
| 983 | * achievable bandwidth with the default receive |
| 984 | * buffer size. It is therefore not wise to account |
| 985 | * for it here. |
| 986 | * |
| 987 | * After alloc_skb(RX_COPY_THRESHOLD), truesize is set |
| 988 | * to RX_COPY_THRESHOLD + the supervisor |
| 989 | * overheads. Here, we add the size of the data pulled |
| 990 | * in xennet_fill_frags(). |
| 991 | * |
| 992 | * We also adjust for any unused space in the main |
| 993 | * data area by subtracting (RX_COPY_THRESHOLD - |
| 994 | * len). This is especially important with drivers |
| 995 | * which split incoming packets into header and data, |
| 996 | * using only 66 bytes of the main data area (see the |
| 997 | * e1000 driver for example.) On such systems, |
| 998 | * without this last adjustement, our achievable |
| 999 | * receive throughout using the standard receive |
| 1000 | * buffer size was cut by 25%(!!!). |
| 1001 | */ |
| 1002 | skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len); |
| 1003 | skb->len += skb->data_len; |
| 1004 | |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1005 | if (rx->flags & XEN_NETRXF_csum_blank) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1006 | skb->ip_summed = CHECKSUM_PARTIAL; |
Ian Campbell | f942dc2 | 2011-03-15 00:06:18 +0000 | [diff] [blame] | 1007 | else if (rx->flags & XEN_NETRXF_data_validated) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1008 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1009 | |
| 1010 | __skb_queue_tail(&rxq, skb); |
| 1011 | |
| 1012 | np->rx.rsp_cons = ++i; |
| 1013 | work_done++; |
| 1014 | } |
| 1015 | |
Wang Chen | 56cfe5d | 2008-05-22 18:09:06 +0800 | [diff] [blame] | 1016 | __skb_queue_purge(&errq); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1017 | |
| 1018 | work_done -= handle_incoming_queue(dev, &rxq); |
| 1019 | |
| 1020 | /* If we get a callback with very few responses, reduce fill target. */ |
| 1021 | /* NB. Note exponential increase, linear decrease. */ |
| 1022 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > |
| 1023 | ((3*np->rx_target) / 4)) && |
| 1024 | (--np->rx_target < np->rx_min_target)) |
| 1025 | np->rx_target = np->rx_min_target; |
| 1026 | |
| 1027 | xennet_alloc_rx_buffers(dev); |
| 1028 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1029 | if (work_done < budget) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1030 | int more_to_do = 0; |
| 1031 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1032 | local_irq_save(flags); |
| 1033 | |
| 1034 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); |
| 1035 | if (!more_to_do) |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 1036 | __napi_complete(napi); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1037 | |
| 1038 | local_irq_restore(flags); |
| 1039 | } |
| 1040 | |
| 1041 | spin_unlock(&np->rx_lock); |
| 1042 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1043 | return work_done; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1044 | } |
| 1045 | |
| 1046 | static int xennet_change_mtu(struct net_device *dev, int mtu) |
| 1047 | { |
| 1048 | int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; |
| 1049 | |
| 1050 | if (mtu > max) |
| 1051 | return -EINVAL; |
| 1052 | dev->mtu = mtu; |
| 1053 | return 0; |
| 1054 | } |
| 1055 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1056 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
| 1057 | struct rtnl_link_stats64 *tot) |
| 1058 | { |
| 1059 | struct netfront_info *np = netdev_priv(dev); |
| 1060 | int cpu; |
| 1061 | |
| 1062 | for_each_possible_cpu(cpu) { |
| 1063 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); |
| 1064 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| 1065 | unsigned int start; |
| 1066 | |
| 1067 | do { |
| 1068 | start = u64_stats_fetch_begin_bh(&stats->syncp); |
| 1069 | |
| 1070 | rx_packets = stats->rx_packets; |
| 1071 | tx_packets = stats->tx_packets; |
| 1072 | rx_bytes = stats->rx_bytes; |
| 1073 | tx_bytes = stats->tx_bytes; |
| 1074 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); |
| 1075 | |
| 1076 | tot->rx_packets += rx_packets; |
| 1077 | tot->tx_packets += tx_packets; |
| 1078 | tot->rx_bytes += rx_bytes; |
| 1079 | tot->tx_bytes += tx_bytes; |
| 1080 | } |
| 1081 | |
| 1082 | tot->rx_errors = dev->stats.rx_errors; |
| 1083 | tot->tx_dropped = dev->stats.tx_dropped; |
| 1084 | |
| 1085 | return tot; |
| 1086 | } |
| 1087 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1088 | static void xennet_release_tx_bufs(struct netfront_info *np) |
| 1089 | { |
| 1090 | struct sk_buff *skb; |
| 1091 | int i; |
| 1092 | |
| 1093 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
| 1094 | /* Skip over entries which are actually freelist references */ |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 1095 | if (skb_entry_is_link(&np->tx_skbs[i])) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1096 | continue; |
| 1097 | |
| 1098 | skb = np->tx_skbs[i].skb; |
| 1099 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], |
| 1100 | GNTMAP_readonly); |
| 1101 | gnttab_release_grant_reference(&np->gref_tx_head, |
| 1102 | np->grant_tx_ref[i]); |
| 1103 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
| 1104 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); |
| 1105 | dev_kfree_skb_irq(skb); |
| 1106 | } |
| 1107 | } |
| 1108 | |
| 1109 | static void xennet_release_rx_bufs(struct netfront_info *np) |
| 1110 | { |
| 1111 | struct mmu_update *mmu = np->rx_mmu; |
| 1112 | struct multicall_entry *mcl = np->rx_mcl; |
| 1113 | struct sk_buff_head free_list; |
| 1114 | struct sk_buff *skb; |
| 1115 | unsigned long mfn; |
| 1116 | int xfer = 0, noxfer = 0, unused = 0; |
| 1117 | int id, ref; |
| 1118 | |
| 1119 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", |
| 1120 | __func__); |
| 1121 | return; |
| 1122 | |
| 1123 | skb_queue_head_init(&free_list); |
| 1124 | |
| 1125 | spin_lock_bh(&np->rx_lock); |
| 1126 | |
| 1127 | for (id = 0; id < NET_RX_RING_SIZE; id++) { |
| 1128 | ref = np->grant_rx_ref[id]; |
| 1129 | if (ref == GRANT_INVALID_REF) { |
| 1130 | unused++; |
| 1131 | continue; |
| 1132 | } |
| 1133 | |
| 1134 | skb = np->rx_skbs[id]; |
| 1135 | mfn = gnttab_end_foreign_transfer_ref(ref); |
| 1136 | gnttab_release_grant_reference(&np->gref_rx_head, ref); |
| 1137 | np->grant_rx_ref[id] = GRANT_INVALID_REF; |
| 1138 | |
| 1139 | if (0 == mfn) { |
| 1140 | skb_shinfo(skb)->nr_frags = 0; |
| 1141 | dev_kfree_skb(skb); |
| 1142 | noxfer++; |
| 1143 | continue; |
| 1144 | } |
| 1145 | |
| 1146 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
| 1147 | /* Remap the page. */ |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 1148 | const struct page *page = |
| 1149 | skb_frag_page(&skb_shinfo(skb)->frags[0]); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1150 | unsigned long pfn = page_to_pfn(page); |
| 1151 | void *vaddr = page_address(page); |
| 1152 | |
| 1153 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, |
| 1154 | mfn_pte(mfn, PAGE_KERNEL), |
| 1155 | 0); |
| 1156 | mcl++; |
| 1157 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) |
| 1158 | | MMU_MACHPHYS_UPDATE; |
| 1159 | mmu->val = pfn; |
| 1160 | mmu++; |
| 1161 | |
| 1162 | set_phys_to_machine(pfn, mfn); |
| 1163 | } |
| 1164 | __skb_queue_tail(&free_list, skb); |
| 1165 | xfer++; |
| 1166 | } |
| 1167 | |
| 1168 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", |
| 1169 | __func__, xfer, noxfer, unused); |
| 1170 | |
| 1171 | if (xfer) { |
| 1172 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
| 1173 | /* Do all the remapping work and M2P updates. */ |
| 1174 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, |
Al Viro | 79ea13c | 2008-01-24 02:06:46 -0800 | [diff] [blame] | 1175 | NULL, DOMID_SELF); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1176 | mcl++; |
| 1177 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); |
| 1178 | } |
| 1179 | } |
| 1180 | |
Wang Chen | 56cfe5d | 2008-05-22 18:09:06 +0800 | [diff] [blame] | 1181 | __skb_queue_purge(&free_list); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1182 | |
| 1183 | spin_unlock_bh(&np->rx_lock); |
| 1184 | } |
| 1185 | |
| 1186 | static void xennet_uninit(struct net_device *dev) |
| 1187 | { |
| 1188 | struct netfront_info *np = netdev_priv(dev); |
| 1189 | xennet_release_tx_bufs(np); |
| 1190 | xennet_release_rx_bufs(np); |
| 1191 | gnttab_free_grant_references(np->gref_tx_head); |
| 1192 | gnttab_free_grant_references(np->gref_rx_head); |
| 1193 | } |
| 1194 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1195 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
| 1196 | netdev_features_t features) |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1197 | { |
| 1198 | struct netfront_info *np = netdev_priv(dev); |
| 1199 | int val; |
| 1200 | |
| 1201 | if (features & NETIF_F_SG) { |
| 1202 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", |
| 1203 | "%d", &val) < 0) |
| 1204 | val = 0; |
| 1205 | |
| 1206 | if (!val) |
| 1207 | features &= ~NETIF_F_SG; |
| 1208 | } |
| 1209 | |
| 1210 | if (features & NETIF_F_TSO) { |
| 1211 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, |
| 1212 | "feature-gso-tcpv4", "%d", &val) < 0) |
| 1213 | val = 0; |
| 1214 | |
| 1215 | if (!val) |
| 1216 | features &= ~NETIF_F_TSO; |
| 1217 | } |
| 1218 | |
| 1219 | return features; |
| 1220 | } |
| 1221 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1222 | static int xennet_set_features(struct net_device *dev, |
| 1223 | netdev_features_t features) |
Eric Dumazet | 8f7b01a | 2011-04-03 17:21:00 -0700 | [diff] [blame] | 1224 | { |
| 1225 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { |
| 1226 | netdev_info(dev, "Reducing MTU because no SG offload"); |
| 1227 | dev->mtu = ETH_DATA_LEN; |
| 1228 | } |
| 1229 | |
| 1230 | return 0; |
| 1231 | } |
| 1232 | |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1233 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
| 1234 | { |
| 1235 | struct net_device *dev = dev_id; |
| 1236 | struct netfront_info *np = netdev_priv(dev); |
| 1237 | unsigned long flags; |
| 1238 | |
| 1239 | spin_lock_irqsave(&np->tx_lock, flags); |
| 1240 | |
| 1241 | if (likely(netif_carrier_ok(dev))) { |
| 1242 | xennet_tx_buf_gc(dev); |
| 1243 | /* Under tx_lock: protects access to rx shared-ring indexes. */ |
| 1244 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) |
| 1245 | napi_schedule(&np->napi); |
| 1246 | } |
| 1247 | |
| 1248 | spin_unlock_irqrestore(&np->tx_lock, flags); |
| 1249 | |
| 1250 | return IRQ_HANDLED; |
| 1251 | } |
| 1252 | |
| 1253 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1254 | static void xennet_poll_controller(struct net_device *dev) |
| 1255 | { |
| 1256 | xennet_interrupt(0, dev); |
| 1257 | } |
| 1258 | #endif |
| 1259 | |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1260 | static const struct net_device_ops xennet_netdev_ops = { |
| 1261 | .ndo_open = xennet_open, |
| 1262 | .ndo_uninit = xennet_uninit, |
| 1263 | .ndo_stop = xennet_close, |
| 1264 | .ndo_start_xmit = xennet_start_xmit, |
| 1265 | .ndo_change_mtu = xennet_change_mtu, |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1266 | .ndo_get_stats64 = xennet_get_stats64, |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1267 | .ndo_set_mac_address = eth_mac_addr, |
| 1268 | .ndo_validate_addr = eth_validate_addr, |
Michał Mirosław | fb50793 | 2011-03-31 01:01:35 +0000 | [diff] [blame] | 1269 | .ndo_fix_features = xennet_fix_features, |
| 1270 | .ndo_set_features = xennet_set_features, |
Konrad Rzeszutek Wilk | cf66f9d | 2012-01-23 08:24:43 +0000 | [diff] [blame] | 1271 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1272 | .ndo_poll_controller = xennet_poll_controller, |
| 1273 | #endif |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1274 | }; |
| 1275 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1276 | static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) |
| 1277 | { |
| 1278 | int i, err; |
| 1279 | struct net_device *netdev; |
| 1280 | struct netfront_info *np; |
| 1281 | |
| 1282 | netdev = alloc_etherdev(sizeof(struct netfront_info)); |
Joe Perches | 41de8d4 | 2012-01-29 13:47:52 +0000 | [diff] [blame] | 1283 | if (!netdev) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1284 | return ERR_PTR(-ENOMEM); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1285 | |
| 1286 | np = netdev_priv(netdev); |
| 1287 | np->xbdev = dev; |
| 1288 | |
| 1289 | spin_lock_init(&np->tx_lock); |
| 1290 | spin_lock_init(&np->rx_lock); |
| 1291 | |
| 1292 | skb_queue_head_init(&np->rx_batch); |
| 1293 | np->rx_target = RX_DFL_MIN_TARGET; |
| 1294 | np->rx_min_target = RX_DFL_MIN_TARGET; |
| 1295 | np->rx_max_target = RX_MAX_TARGET; |
| 1296 | |
| 1297 | init_timer(&np->rx_refill_timer); |
| 1298 | np->rx_refill_timer.data = (unsigned long)netdev; |
| 1299 | np->rx_refill_timer.function = rx_refill_timeout; |
| 1300 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1301 | err = -ENOMEM; |
| 1302 | np->stats = alloc_percpu(struct netfront_stats); |
| 1303 | if (np->stats == NULL) |
| 1304 | goto exit; |
| 1305 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1306 | /* Initialise tx_skbs as a free chain containing every entry. */ |
| 1307 | np->tx_skb_freelist = 0; |
| 1308 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
Isaku Yamahata | 1ffb40b | 2008-07-08 15:06:31 -0700 | [diff] [blame] | 1309 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1310 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
| 1311 | } |
| 1312 | |
| 1313 | /* Clear out rx_skbs */ |
| 1314 | for (i = 0; i < NET_RX_RING_SIZE; i++) { |
| 1315 | np->rx_skbs[i] = NULL; |
| 1316 | np->grant_rx_ref[i] = GRANT_INVALID_REF; |
| 1317 | } |
| 1318 | |
| 1319 | /* A grant for every tx ring slot */ |
| 1320 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, |
| 1321 | &np->gref_tx_head) < 0) { |
| 1322 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); |
| 1323 | err = -ENOMEM; |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1324 | goto exit_free_stats; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1325 | } |
| 1326 | /* A grant for every rx ring slot */ |
| 1327 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, |
| 1328 | &np->gref_rx_head) < 0) { |
| 1329 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); |
| 1330 | err = -ENOMEM; |
| 1331 | goto exit_free_tx; |
| 1332 | } |
| 1333 | |
Stephen Hemminger | 0a0b9d2 | 2009-01-06 10:44:55 -0800 | [diff] [blame] | 1334 | netdev->netdev_ops = &xennet_netdev_ops; |
| 1335 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1336 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
Michał Mirosław | fb50793 | 2011-03-31 01:01:35 +0000 | [diff] [blame] | 1337 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
| 1338 | NETIF_F_GSO_ROBUST; |
| 1339 | netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1340 | |
Ian Campbell | fc3e594 | 2011-04-04 11:07:57 -0700 | [diff] [blame] | 1341 | /* |
| 1342 | * Assume that all hw features are available for now. This set |
| 1343 | * will be adjusted by the call to netdev_update_features() in |
| 1344 | * xennet_connect() which is the earliest point where we can |
| 1345 | * negotiate with the backend regarding supported features. |
| 1346 | */ |
| 1347 | netdev->features |= netdev->hw_features; |
| 1348 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1349 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1350 | SET_NETDEV_DEV(netdev, &dev->dev); |
| 1351 | |
| 1352 | np->netdev = netdev; |
| 1353 | |
| 1354 | netif_carrier_off(netdev); |
| 1355 | |
| 1356 | return netdev; |
| 1357 | |
| 1358 | exit_free_tx: |
| 1359 | gnttab_free_grant_references(np->gref_tx_head); |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1360 | exit_free_stats: |
| 1361 | free_percpu(np->stats); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1362 | exit: |
| 1363 | free_netdev(netdev); |
| 1364 | return ERR_PTR(err); |
| 1365 | } |
| 1366 | |
| 1367 | /** |
| 1368 | * Entry point to this code when a new device is created. Allocate the basic |
| 1369 | * structures and the ring buffers for communication with the backend, and |
| 1370 | * inform the backend of the appropriate details for those. |
| 1371 | */ |
| 1372 | static int __devinit netfront_probe(struct xenbus_device *dev, |
| 1373 | const struct xenbus_device_id *id) |
| 1374 | { |
| 1375 | int err; |
| 1376 | struct net_device *netdev; |
| 1377 | struct netfront_info *info; |
| 1378 | |
| 1379 | netdev = xennet_create_dev(dev); |
| 1380 | if (IS_ERR(netdev)) { |
| 1381 | err = PTR_ERR(netdev); |
| 1382 | xenbus_dev_fatal(dev, err, "creating netdev"); |
| 1383 | return err; |
| 1384 | } |
| 1385 | |
| 1386 | info = netdev_priv(netdev); |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1387 | dev_set_drvdata(&dev->dev, info); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1388 | |
| 1389 | err = register_netdev(info->netdev); |
| 1390 | if (err) { |
| 1391 | printk(KERN_WARNING "%s: register_netdev err=%d\n", |
| 1392 | __func__, err); |
| 1393 | goto fail; |
| 1394 | } |
| 1395 | |
| 1396 | err = xennet_sysfs_addif(info->netdev); |
| 1397 | if (err) { |
| 1398 | unregister_netdev(info->netdev); |
| 1399 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", |
| 1400 | __func__, err); |
| 1401 | goto fail; |
| 1402 | } |
| 1403 | |
| 1404 | return 0; |
| 1405 | |
| 1406 | fail: |
| 1407 | free_netdev(netdev); |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1408 | dev_set_drvdata(&dev->dev, NULL); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1409 | return err; |
| 1410 | } |
| 1411 | |
| 1412 | static void xennet_end_access(int ref, void *page) |
| 1413 | { |
| 1414 | /* This frees the page as a side-effect */ |
| 1415 | if (ref != GRANT_INVALID_REF) |
| 1416 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); |
| 1417 | } |
| 1418 | |
| 1419 | static void xennet_disconnect_backend(struct netfront_info *info) |
| 1420 | { |
| 1421 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ |
| 1422 | spin_lock_bh(&info->rx_lock); |
| 1423 | spin_lock_irq(&info->tx_lock); |
| 1424 | netif_carrier_off(info->netdev); |
| 1425 | spin_unlock_irq(&info->tx_lock); |
| 1426 | spin_unlock_bh(&info->rx_lock); |
| 1427 | |
| 1428 | if (info->netdev->irq) |
| 1429 | unbind_from_irqhandler(info->netdev->irq, info->netdev); |
| 1430 | info->evtchn = info->netdev->irq = 0; |
| 1431 | |
| 1432 | /* End access and free the pages */ |
| 1433 | xennet_end_access(info->tx_ring_ref, info->tx.sring); |
| 1434 | xennet_end_access(info->rx_ring_ref, info->rx.sring); |
| 1435 | |
| 1436 | info->tx_ring_ref = GRANT_INVALID_REF; |
| 1437 | info->rx_ring_ref = GRANT_INVALID_REF; |
| 1438 | info->tx.sring = NULL; |
| 1439 | info->rx.sring = NULL; |
| 1440 | } |
| 1441 | |
| 1442 | /** |
| 1443 | * We are reconnecting to the backend, due to a suspend/resume, or a backend |
| 1444 | * driver restart. We tear down our netif structure and recreate it, but |
| 1445 | * leave the device-layer structures intact so that this is transparent to the |
| 1446 | * rest of the kernel. |
| 1447 | */ |
| 1448 | static int netfront_resume(struct xenbus_device *dev) |
| 1449 | { |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1450 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1451 | |
| 1452 | dev_dbg(&dev->dev, "%s\n", dev->nodename); |
| 1453 | |
| 1454 | xennet_disconnect_backend(info); |
| 1455 | return 0; |
| 1456 | } |
| 1457 | |
| 1458 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) |
| 1459 | { |
| 1460 | char *s, *e, *macstr; |
| 1461 | int i; |
| 1462 | |
| 1463 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); |
| 1464 | if (IS_ERR(macstr)) |
| 1465 | return PTR_ERR(macstr); |
| 1466 | |
| 1467 | for (i = 0; i < ETH_ALEN; i++) { |
| 1468 | mac[i] = simple_strtoul(s, &e, 16); |
| 1469 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { |
| 1470 | kfree(macstr); |
| 1471 | return -ENOENT; |
| 1472 | } |
| 1473 | s = e+1; |
| 1474 | } |
| 1475 | |
| 1476 | kfree(macstr); |
| 1477 | return 0; |
| 1478 | } |
| 1479 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1480 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
| 1481 | { |
| 1482 | struct xen_netif_tx_sring *txs; |
| 1483 | struct xen_netif_rx_sring *rxs; |
| 1484 | int err; |
| 1485 | struct net_device *netdev = info->netdev; |
| 1486 | |
| 1487 | info->tx_ring_ref = GRANT_INVALID_REF; |
| 1488 | info->rx_ring_ref = GRANT_INVALID_REF; |
| 1489 | info->rx.sring = NULL; |
| 1490 | info->tx.sring = NULL; |
| 1491 | netdev->irq = 0; |
| 1492 | |
| 1493 | err = xen_net_read_mac(dev, netdev->dev_addr); |
| 1494 | if (err) { |
| 1495 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
| 1496 | goto fail; |
| 1497 | } |
| 1498 | |
Ian Campbell | a144ff0 | 2008-06-17 10:47:08 +0200 | [diff] [blame] | 1499 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1500 | if (!txs) { |
| 1501 | err = -ENOMEM; |
| 1502 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); |
| 1503 | goto fail; |
| 1504 | } |
| 1505 | SHARED_RING_INIT(txs); |
| 1506 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); |
| 1507 | |
| 1508 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); |
| 1509 | if (err < 0) { |
| 1510 | free_page((unsigned long)txs); |
| 1511 | goto fail; |
| 1512 | } |
| 1513 | |
| 1514 | info->tx_ring_ref = err; |
Ian Campbell | a144ff0 | 2008-06-17 10:47:08 +0200 | [diff] [blame] | 1515 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1516 | if (!rxs) { |
| 1517 | err = -ENOMEM; |
| 1518 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); |
| 1519 | goto fail; |
| 1520 | } |
| 1521 | SHARED_RING_INIT(rxs); |
| 1522 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); |
| 1523 | |
| 1524 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); |
| 1525 | if (err < 0) { |
| 1526 | free_page((unsigned long)rxs); |
| 1527 | goto fail; |
| 1528 | } |
| 1529 | info->rx_ring_ref = err; |
| 1530 | |
| 1531 | err = xenbus_alloc_evtchn(dev, &info->evtchn); |
| 1532 | if (err) |
| 1533 | goto fail; |
| 1534 | |
| 1535 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, |
Javier Martinez Canillas | ab392d2 | 2011-03-28 16:27:31 +0000 | [diff] [blame] | 1536 | 0, netdev->name, netdev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1537 | if (err < 0) |
| 1538 | goto fail; |
| 1539 | netdev->irq = err; |
| 1540 | return 0; |
| 1541 | |
| 1542 | fail: |
| 1543 | return err; |
| 1544 | } |
| 1545 | |
| 1546 | /* Common code used when first setting up, and when resuming. */ |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 1547 | static int talk_to_netback(struct xenbus_device *dev, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1548 | struct netfront_info *info) |
| 1549 | { |
| 1550 | const char *message; |
| 1551 | struct xenbus_transaction xbt; |
| 1552 | int err; |
| 1553 | |
| 1554 | /* Create shared ring, alloc event channel. */ |
| 1555 | err = setup_netfront(dev, info); |
| 1556 | if (err) |
| 1557 | goto out; |
| 1558 | |
| 1559 | again: |
| 1560 | err = xenbus_transaction_start(&xbt); |
| 1561 | if (err) { |
| 1562 | xenbus_dev_fatal(dev, err, "starting transaction"); |
| 1563 | goto destroy_ring; |
| 1564 | } |
| 1565 | |
| 1566 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", |
| 1567 | info->tx_ring_ref); |
| 1568 | if (err) { |
| 1569 | message = "writing tx ring-ref"; |
| 1570 | goto abort_transaction; |
| 1571 | } |
| 1572 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", |
| 1573 | info->rx_ring_ref); |
| 1574 | if (err) { |
| 1575 | message = "writing rx ring-ref"; |
| 1576 | goto abort_transaction; |
| 1577 | } |
| 1578 | err = xenbus_printf(xbt, dev->nodename, |
| 1579 | "event-channel", "%u", info->evtchn); |
| 1580 | if (err) { |
| 1581 | message = "writing event-channel"; |
| 1582 | goto abort_transaction; |
| 1583 | } |
| 1584 | |
| 1585 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
| 1586 | 1); |
| 1587 | if (err) { |
| 1588 | message = "writing request-rx-copy"; |
| 1589 | goto abort_transaction; |
| 1590 | } |
| 1591 | |
| 1592 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); |
| 1593 | if (err) { |
| 1594 | message = "writing feature-rx-notify"; |
| 1595 | goto abort_transaction; |
| 1596 | } |
| 1597 | |
| 1598 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); |
| 1599 | if (err) { |
| 1600 | message = "writing feature-sg"; |
| 1601 | goto abort_transaction; |
| 1602 | } |
| 1603 | |
| 1604 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); |
| 1605 | if (err) { |
| 1606 | message = "writing feature-gso-tcpv4"; |
| 1607 | goto abort_transaction; |
| 1608 | } |
| 1609 | |
| 1610 | err = xenbus_transaction_end(xbt, 0); |
| 1611 | if (err) { |
| 1612 | if (err == -EAGAIN) |
| 1613 | goto again; |
| 1614 | xenbus_dev_fatal(dev, err, "completing transaction"); |
| 1615 | goto destroy_ring; |
| 1616 | } |
| 1617 | |
| 1618 | return 0; |
| 1619 | |
| 1620 | abort_transaction: |
| 1621 | xenbus_transaction_end(xbt, 1); |
| 1622 | xenbus_dev_fatal(dev, err, "%s", message); |
| 1623 | destroy_ring: |
| 1624 | xennet_disconnect_backend(info); |
| 1625 | out: |
| 1626 | return err; |
| 1627 | } |
| 1628 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1629 | static int xennet_connect(struct net_device *dev) |
| 1630 | { |
| 1631 | struct netfront_info *np = netdev_priv(dev); |
| 1632 | int i, requeue_idx, err; |
| 1633 | struct sk_buff *skb; |
| 1634 | grant_ref_t ref; |
| 1635 | struct xen_netif_rx_request *req; |
| 1636 | unsigned int feature_rx_copy; |
| 1637 | |
| 1638 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, |
| 1639 | "feature-rx-copy", "%u", &feature_rx_copy); |
| 1640 | if (err != 1) |
| 1641 | feature_rx_copy = 0; |
| 1642 | |
| 1643 | if (!feature_rx_copy) { |
| 1644 | dev_info(&dev->dev, |
Joe Perches | 898eb71 | 2007-10-18 03:06:30 -0700 | [diff] [blame] | 1645 | "backend does not support copying receive path\n"); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1646 | return -ENODEV; |
| 1647 | } |
| 1648 | |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 1649 | err = talk_to_netback(np->xbdev, np); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1650 | if (err) |
| 1651 | return err; |
| 1652 | |
Ian Campbell | 1ba37c5 | 2011-05-24 21:56:02 +0000 | [diff] [blame] | 1653 | rtnl_lock(); |
Michał Mirosław | fb50793 | 2011-03-31 01:01:35 +0000 | [diff] [blame] | 1654 | netdev_update_features(dev); |
Ian Campbell | 1ba37c5 | 2011-05-24 21:56:02 +0000 | [diff] [blame] | 1655 | rtnl_unlock(); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1656 | |
| 1657 | spin_lock_bh(&np->rx_lock); |
| 1658 | spin_lock_irq(&np->tx_lock); |
| 1659 | |
| 1660 | /* Step 1: Discard all pending TX packet fragments. */ |
| 1661 | xennet_release_tx_bufs(np); |
| 1662 | |
| 1663 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ |
| 1664 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 1665 | skb_frag_t *frag; |
| 1666 | const struct page *page; |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1667 | if (!np->rx_skbs[i]) |
| 1668 | continue; |
| 1669 | |
| 1670 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); |
| 1671 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); |
| 1672 | req = RING_GET_REQUEST(&np->rx, requeue_idx); |
| 1673 | |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 1674 | frag = &skb_shinfo(skb)->frags[0]; |
| 1675 | page = skb_frag_page(frag); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1676 | gnttab_grant_foreign_access_ref( |
| 1677 | ref, np->xbdev->otherend_id, |
Ian Campbell | 01c6802 | 2011-10-05 00:28:47 +0000 | [diff] [blame] | 1678 | pfn_to_mfn(page_to_pfn(page)), |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1679 | 0); |
| 1680 | req->gref = ref; |
| 1681 | req->id = requeue_idx; |
| 1682 | |
| 1683 | requeue_idx++; |
| 1684 | } |
| 1685 | |
| 1686 | np->rx.req_prod_pvt = requeue_idx; |
| 1687 | |
| 1688 | /* |
| 1689 | * Step 3: All public and private state should now be sane. Get |
| 1690 | * ready to start sending and receiving packets and give the driver |
| 1691 | * domain a kick because we've probably just requeued some |
| 1692 | * packets. |
| 1693 | */ |
| 1694 | netif_carrier_on(np->netdev); |
| 1695 | notify_remote_via_irq(np->netdev->irq); |
| 1696 | xennet_tx_buf_gc(dev); |
| 1697 | xennet_alloc_rx_buffers(dev); |
| 1698 | |
| 1699 | spin_unlock_irq(&np->tx_lock); |
| 1700 | spin_unlock_bh(&np->rx_lock); |
| 1701 | |
| 1702 | return 0; |
| 1703 | } |
| 1704 | |
| 1705 | /** |
| 1706 | * Callback received when the backend's state changes. |
| 1707 | */ |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 1708 | static void netback_changed(struct xenbus_device *dev, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1709 | enum xenbus_state backend_state) |
| 1710 | { |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1711 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1712 | struct net_device *netdev = np->netdev; |
| 1713 | |
| 1714 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); |
| 1715 | |
| 1716 | switch (backend_state) { |
| 1717 | case XenbusStateInitialising: |
| 1718 | case XenbusStateInitialised: |
Noboru Iwamatsu | b78c951 | 2009-10-13 17:22:29 -0400 | [diff] [blame] | 1719 | case XenbusStateReconfiguring: |
| 1720 | case XenbusStateReconfigured: |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1721 | case XenbusStateUnknown: |
| 1722 | case XenbusStateClosed: |
| 1723 | break; |
| 1724 | |
| 1725 | case XenbusStateInitWait: |
| 1726 | if (dev->state != XenbusStateInitialising) |
| 1727 | break; |
| 1728 | if (xennet_connect(netdev) != 0) |
| 1729 | break; |
| 1730 | xenbus_switch_state(dev, XenbusStateConnected); |
Laszlo Ersek | 08e34eb | 2011-12-11 01:48:59 +0000 | [diff] [blame] | 1731 | break; |
| 1732 | |
| 1733 | case XenbusStateConnected: |
Ian Campbell | 5929706 | 2010-05-26 00:09:43 +0000 | [diff] [blame] | 1734 | netif_notify_peers(netdev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1735 | break; |
| 1736 | |
| 1737 | case XenbusStateClosing: |
| 1738 | xenbus_frontend_closed(dev); |
| 1739 | break; |
| 1740 | } |
| 1741 | } |
| 1742 | |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 1743 | static const struct xennet_stat { |
| 1744 | char name[ETH_GSTRING_LEN]; |
| 1745 | u16 offset; |
| 1746 | } xennet_stats[] = { |
| 1747 | { |
| 1748 | "rx_gso_checksum_fixup", |
| 1749 | offsetof(struct netfront_info, rx_gso_checksum_fixup) |
| 1750 | }, |
| 1751 | }; |
| 1752 | |
| 1753 | static int xennet_get_sset_count(struct net_device *dev, int string_set) |
| 1754 | { |
| 1755 | switch (string_set) { |
| 1756 | case ETH_SS_STATS: |
| 1757 | return ARRAY_SIZE(xennet_stats); |
| 1758 | default: |
| 1759 | return -EINVAL; |
| 1760 | } |
| 1761 | } |
| 1762 | |
| 1763 | static void xennet_get_ethtool_stats(struct net_device *dev, |
| 1764 | struct ethtool_stats *stats, u64 * data) |
| 1765 | { |
| 1766 | void *np = netdev_priv(dev); |
| 1767 | int i; |
| 1768 | |
| 1769 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
Eric Dumazet | 48f26d5 | 2011-03-14 21:05:40 -0700 | [diff] [blame] | 1770 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 1771 | } |
| 1772 | |
| 1773 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) |
| 1774 | { |
| 1775 | int i; |
| 1776 | |
| 1777 | switch (stringset) { |
| 1778 | case ETH_SS_STATS: |
| 1779 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
| 1780 | memcpy(data + i * ETH_GSTRING_LEN, |
| 1781 | xennet_stats[i].name, ETH_GSTRING_LEN); |
| 1782 | break; |
| 1783 | } |
| 1784 | } |
| 1785 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 1786 | static const struct ethtool_ops xennet_ethtool_ops = |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1787 | { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1788 | .get_link = ethtool_op_get_link, |
Ian Campbell | e0ce4af | 2011-01-27 04:14:03 +0000 | [diff] [blame] | 1789 | |
| 1790 | .get_sset_count = xennet_get_sset_count, |
| 1791 | .get_ethtool_stats = xennet_get_ethtool_stats, |
| 1792 | .get_strings = xennet_get_strings, |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1793 | }; |
| 1794 | |
| 1795 | #ifdef CONFIG_SYSFS |
| 1796 | static ssize_t show_rxbuf_min(struct device *dev, |
| 1797 | struct device_attribute *attr, char *buf) |
| 1798 | { |
| 1799 | struct net_device *netdev = to_net_dev(dev); |
| 1800 | struct netfront_info *info = netdev_priv(netdev); |
| 1801 | |
| 1802 | return sprintf(buf, "%u\n", info->rx_min_target); |
| 1803 | } |
| 1804 | |
| 1805 | static ssize_t store_rxbuf_min(struct device *dev, |
| 1806 | struct device_attribute *attr, |
| 1807 | const char *buf, size_t len) |
| 1808 | { |
| 1809 | struct net_device *netdev = to_net_dev(dev); |
| 1810 | struct netfront_info *np = netdev_priv(netdev); |
| 1811 | char *endp; |
| 1812 | unsigned long target; |
| 1813 | |
| 1814 | if (!capable(CAP_NET_ADMIN)) |
| 1815 | return -EPERM; |
| 1816 | |
| 1817 | target = simple_strtoul(buf, &endp, 0); |
| 1818 | if (endp == buf) |
| 1819 | return -EBADMSG; |
| 1820 | |
| 1821 | if (target < RX_MIN_TARGET) |
| 1822 | target = RX_MIN_TARGET; |
| 1823 | if (target > RX_MAX_TARGET) |
| 1824 | target = RX_MAX_TARGET; |
| 1825 | |
| 1826 | spin_lock_bh(&np->rx_lock); |
| 1827 | if (target > np->rx_max_target) |
| 1828 | np->rx_max_target = target; |
| 1829 | np->rx_min_target = target; |
| 1830 | if (target > np->rx_target) |
| 1831 | np->rx_target = target; |
| 1832 | |
| 1833 | xennet_alloc_rx_buffers(netdev); |
| 1834 | |
| 1835 | spin_unlock_bh(&np->rx_lock); |
| 1836 | return len; |
| 1837 | } |
| 1838 | |
| 1839 | static ssize_t show_rxbuf_max(struct device *dev, |
| 1840 | struct device_attribute *attr, char *buf) |
| 1841 | { |
| 1842 | struct net_device *netdev = to_net_dev(dev); |
| 1843 | struct netfront_info *info = netdev_priv(netdev); |
| 1844 | |
| 1845 | return sprintf(buf, "%u\n", info->rx_max_target); |
| 1846 | } |
| 1847 | |
| 1848 | static ssize_t store_rxbuf_max(struct device *dev, |
| 1849 | struct device_attribute *attr, |
| 1850 | const char *buf, size_t len) |
| 1851 | { |
| 1852 | struct net_device *netdev = to_net_dev(dev); |
| 1853 | struct netfront_info *np = netdev_priv(netdev); |
| 1854 | char *endp; |
| 1855 | unsigned long target; |
| 1856 | |
| 1857 | if (!capable(CAP_NET_ADMIN)) |
| 1858 | return -EPERM; |
| 1859 | |
| 1860 | target = simple_strtoul(buf, &endp, 0); |
| 1861 | if (endp == buf) |
| 1862 | return -EBADMSG; |
| 1863 | |
| 1864 | if (target < RX_MIN_TARGET) |
| 1865 | target = RX_MIN_TARGET; |
| 1866 | if (target > RX_MAX_TARGET) |
| 1867 | target = RX_MAX_TARGET; |
| 1868 | |
| 1869 | spin_lock_bh(&np->rx_lock); |
| 1870 | if (target < np->rx_min_target) |
| 1871 | np->rx_min_target = target; |
| 1872 | np->rx_max_target = target; |
| 1873 | if (target < np->rx_target) |
| 1874 | np->rx_target = target; |
| 1875 | |
| 1876 | xennet_alloc_rx_buffers(netdev); |
| 1877 | |
| 1878 | spin_unlock_bh(&np->rx_lock); |
| 1879 | return len; |
| 1880 | } |
| 1881 | |
| 1882 | static ssize_t show_rxbuf_cur(struct device *dev, |
| 1883 | struct device_attribute *attr, char *buf) |
| 1884 | { |
| 1885 | struct net_device *netdev = to_net_dev(dev); |
| 1886 | struct netfront_info *info = netdev_priv(netdev); |
| 1887 | |
| 1888 | return sprintf(buf, "%u\n", info->rx_target); |
| 1889 | } |
| 1890 | |
| 1891 | static struct device_attribute xennet_attrs[] = { |
| 1892 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), |
| 1893 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), |
| 1894 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), |
| 1895 | }; |
| 1896 | |
| 1897 | static int xennet_sysfs_addif(struct net_device *netdev) |
| 1898 | { |
| 1899 | int i; |
| 1900 | int err; |
| 1901 | |
| 1902 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { |
| 1903 | err = device_create_file(&netdev->dev, |
| 1904 | &xennet_attrs[i]); |
| 1905 | if (err) |
| 1906 | goto fail; |
| 1907 | } |
| 1908 | return 0; |
| 1909 | |
| 1910 | fail: |
| 1911 | while (--i >= 0) |
| 1912 | device_remove_file(&netdev->dev, &xennet_attrs[i]); |
| 1913 | return err; |
| 1914 | } |
| 1915 | |
| 1916 | static void xennet_sysfs_delif(struct net_device *netdev) |
| 1917 | { |
| 1918 | int i; |
| 1919 | |
| 1920 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) |
| 1921 | device_remove_file(&netdev->dev, &xennet_attrs[i]); |
| 1922 | } |
| 1923 | |
| 1924 | #endif /* CONFIG_SYSFS */ |
| 1925 | |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1926 | static const struct xenbus_device_id netfront_ids[] = { |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1927 | { "vif" }, |
| 1928 | { "" } |
| 1929 | }; |
| 1930 | |
| 1931 | |
| 1932 | static int __devexit xennet_remove(struct xenbus_device *dev) |
| 1933 | { |
Greg Kroah-Hartman | 1b713e0 | 2009-05-04 12:40:54 -0700 | [diff] [blame] | 1934 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1935 | |
| 1936 | dev_dbg(&dev->dev, "%s\n", dev->nodename); |
| 1937 | |
| 1938 | unregister_netdev(info->netdev); |
| 1939 | |
| 1940 | xennet_disconnect_backend(info); |
| 1941 | |
| 1942 | del_timer_sync(&info->rx_refill_timer); |
| 1943 | |
| 1944 | xennet_sysfs_delif(info->netdev); |
| 1945 | |
stephen hemminger | e00f85b | 2011-06-21 05:35:31 +0000 | [diff] [blame] | 1946 | free_percpu(info->stats); |
| 1947 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1948 | free_netdev(info->netdev); |
| 1949 | |
| 1950 | return 0; |
| 1951 | } |
| 1952 | |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1953 | static DEFINE_XENBUS_DRIVER(netfront, , |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1954 | .probe = netfront_probe, |
| 1955 | .remove = __devexit_p(xennet_remove), |
| 1956 | .resume = netfront_resume, |
Ian Campbell | f502bf2 | 2010-08-18 23:27:49 +0000 | [diff] [blame] | 1957 | .otherend_changed = netback_changed, |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 1958 | ); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1959 | |
| 1960 | static int __init netif_init(void) |
| 1961 | { |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1962 | if (!xen_domain()) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1963 | return -ENODEV; |
| 1964 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1965 | if (xen_initial_domain()) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1966 | return 0; |
| 1967 | |
Igor Mammedov | b9136d2 | 2012-03-21 15:08:38 +0100 | [diff] [blame] | 1968 | if (!xen_platform_pci_unplug) |
| 1969 | return -ENODEV; |
| 1970 | |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1971 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); |
| 1972 | |
Al Viro | ffb78a2 | 2008-11-22 17:38:14 +0000 | [diff] [blame] | 1973 | return xenbus_register_frontend(&netfront_driver); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1974 | } |
| 1975 | module_init(netif_init); |
| 1976 | |
| 1977 | |
| 1978 | static void __exit netif_exit(void) |
| 1979 | { |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 1980 | if (xen_initial_domain()) |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1981 | return; |
| 1982 | |
Al Viro | ffb78a2 | 2008-11-22 17:38:14 +0000 | [diff] [blame] | 1983 | xenbus_unregister_driver(&netfront_driver); |
Jeremy Fitzhardinge | 0d16021 | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1984 | } |
| 1985 | module_exit(netif_exit); |
| 1986 | |
| 1987 | MODULE_DESCRIPTION("Xen virtual network device frontend"); |
| 1988 | MODULE_LICENSE("GPL"); |
Mark McLoughlin | d2f0c52 | 2008-04-02 10:54:05 -0700 | [diff] [blame] | 1989 | MODULE_ALIAS("xen:vif"); |
Mark McLoughlin | 4f93f09b | 2008-04-02 10:54:06 -0700 | [diff] [blame] | 1990 | MODULE_ALIAS("xennet"); |