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