Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 1 | /* A network driver using virtio. |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 2 | * |
| 3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | //#define DEBUG |
| 20 | #include <linux/netdevice.h> |
| 21 | #include <linux/etherdevice.h> |
Herbert Xu | a9ea3fc | 2008-04-18 11:21:42 +0800 | [diff] [blame] | 22 | #include <linux/ethtool.h> |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 23 | #include <linux/module.h> |
| 24 | #include <linux/virtio.h> |
| 25 | #include <linux/virtio_net.h> |
| 26 | #include <linux/scatterlist.h> |
Alex Williamson | e918085a | 2009-01-25 18:06:26 -0800 | [diff] [blame] | 27 | #include <linux/if_vlan.h> |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 28 | |
Dor Laor | 6c0cd7c | 2007-12-16 15:19:43 +0200 | [diff] [blame] | 29 | static int napi_weight = 128; |
| 30 | module_param(napi_weight, int, 0444); |
| 31 | |
Rusty Russell | 34a4857 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 32 | static int csum = 1, gso = 1; |
| 33 | module_param(csum, bool, 0444); |
| 34 | module_param(gso, bool, 0444); |
| 35 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 36 | /* FIXME: MTU in config. */ |
Alex Williamson | e918085a | 2009-01-25 18:06:26 -0800 | [diff] [blame] | 37 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 38 | #define GOOD_COPY_LEN 128 |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 39 | |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 40 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 41 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 42 | struct virtnet_info |
| 43 | { |
| 44 | struct virtio_device *vdev; |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 45 | struct virtqueue *rvq, *svq, *cvq; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 46 | struct net_device *dev; |
| 47 | struct napi_struct napi; |
Mark McLoughlin | 9f4d26d | 2009-01-19 17:09:49 -0800 | [diff] [blame] | 48 | unsigned int status; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 49 | |
| 50 | /* Number of input buffers, and max we've ever had. */ |
| 51 | unsigned int num, max; |
| 52 | |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 53 | /* I like... big packets and I cannot lie! */ |
| 54 | bool big_packets; |
| 55 | |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 56 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
| 57 | bool mergeable_rx_bufs; |
| 58 | |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 59 | /* Work struct for refilling if we run low on memory. */ |
| 60 | struct delayed_work refill; |
| 61 | |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 62 | /* Chain pages by the private ptr. */ |
| 63 | struct page *pages; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 64 | }; |
| 65 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 66 | struct skb_vnet_hdr { |
| 67 | union { |
| 68 | struct virtio_net_hdr hdr; |
| 69 | struct virtio_net_hdr_mrg_rxbuf mhdr; |
| 70 | }; |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 71 | unsigned int num_sg; |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 72 | }; |
| 73 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 74 | struct padded_vnet_hdr { |
| 75 | struct virtio_net_hdr hdr; |
| 76 | /* |
| 77 | * virtio_net_hdr should be in a separated sg buffer because of a |
| 78 | * QEMU bug, and data sg buffer shares same page with this header sg. |
| 79 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. |
| 80 | */ |
| 81 | char padding[6]; |
| 82 | }; |
| 83 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 84 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 85 | { |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 86 | return (struct skb_vnet_hdr *)skb->cb; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 87 | } |
| 88 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 89 | /* |
| 90 | * private is used to chain pages for big packets, put the whole |
| 91 | * most recent used list in the beginning for reuse |
| 92 | */ |
| 93 | static void give_pages(struct virtnet_info *vi, struct page *page) |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 94 | { |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 95 | struct page *end; |
| 96 | |
| 97 | /* Find end of list, sew whole thing into vi->pages. */ |
| 98 | for (end = page; end->private; end = (struct page *)end->private); |
| 99 | end->private = (unsigned long)vi->pages; |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 100 | vi->pages = page; |
| 101 | } |
| 102 | |
| 103 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
| 104 | { |
| 105 | struct page *p = vi->pages; |
| 106 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 107 | if (p) { |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 108 | vi->pages = (struct page *)p->private; |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 109 | /* clear private here, it is used to chain pages */ |
| 110 | p->private = 0; |
| 111 | } else |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 112 | p = alloc_page(gfp_mask); |
| 113 | return p; |
| 114 | } |
| 115 | |
Rusty Russell | 2cb9c6b | 2008-02-04 23:50:07 -0500 | [diff] [blame] | 116 | static void skb_xmit_done(struct virtqueue *svq) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 117 | { |
Rusty Russell | 2cb9c6b | 2008-02-04 23:50:07 -0500 | [diff] [blame] | 118 | struct virtnet_info *vi = svq->vdev->priv; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 119 | |
Rusty Russell | 2cb9c6b | 2008-02-04 23:50:07 -0500 | [diff] [blame] | 120 | /* Suppress further interrupts. */ |
| 121 | svq->vq_ops->disable_cb(svq); |
Rusty Russell | 11a3a15 | 2008-05-26 17:48:13 +1000 | [diff] [blame] | 122 | |
Rusty Russell | 363f151 | 2008-06-08 20:51:55 +1000 | [diff] [blame] | 123 | /* We were probably waiting for more output buffers. */ |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 124 | netif_wake_queue(vi->dev); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 125 | } |
| 126 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 127 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
| 128 | unsigned int offset, unsigned int *len) |
| 129 | { |
| 130 | int i = skb_shinfo(skb)->nr_frags; |
| 131 | skb_frag_t *f; |
| 132 | |
| 133 | f = &skb_shinfo(skb)->frags[i]; |
| 134 | f->size = min((unsigned)PAGE_SIZE - offset, *len); |
| 135 | f->page_offset = offset; |
| 136 | f->page = page; |
| 137 | |
| 138 | skb->data_len += f->size; |
| 139 | skb->len += f->size; |
| 140 | skb_shinfo(skb)->nr_frags++; |
| 141 | *len -= f->size; |
| 142 | } |
| 143 | |
| 144 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
| 145 | struct page *page, unsigned int len) |
| 146 | { |
| 147 | struct sk_buff *skb; |
| 148 | struct skb_vnet_hdr *hdr; |
| 149 | unsigned int copy, hdr_len, offset; |
| 150 | char *p; |
| 151 | |
| 152 | p = page_address(page); |
| 153 | |
| 154 | /* copy small packet so we can reuse these pages for small data */ |
| 155 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); |
| 156 | if (unlikely(!skb)) |
| 157 | return NULL; |
| 158 | |
| 159 | hdr = skb_vnet_hdr(skb); |
| 160 | |
| 161 | if (vi->mergeable_rx_bufs) { |
| 162 | hdr_len = sizeof hdr->mhdr; |
| 163 | offset = hdr_len; |
| 164 | } else { |
| 165 | hdr_len = sizeof hdr->hdr; |
| 166 | offset = sizeof(struct padded_vnet_hdr); |
| 167 | } |
| 168 | |
| 169 | memcpy(hdr, p, hdr_len); |
| 170 | |
| 171 | len -= hdr_len; |
| 172 | p += offset; |
| 173 | |
| 174 | copy = len; |
| 175 | if (copy > skb_tailroom(skb)) |
| 176 | copy = skb_tailroom(skb); |
| 177 | memcpy(skb_put(skb, copy), p, copy); |
| 178 | |
| 179 | len -= copy; |
| 180 | offset += copy; |
| 181 | |
| 182 | while (len) { |
| 183 | set_skb_frag(skb, page, offset, &len); |
| 184 | page = (struct page *)page->private; |
| 185 | offset = 0; |
| 186 | } |
| 187 | |
| 188 | if (page) |
| 189 | give_pages(vi, page); |
| 190 | |
| 191 | return skb; |
| 192 | } |
| 193 | |
| 194 | static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) |
| 195 | { |
| 196 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
| 197 | struct page *page; |
| 198 | int num_buf, i, len; |
| 199 | |
| 200 | num_buf = hdr->mhdr.num_buffers; |
| 201 | while (--num_buf) { |
| 202 | i = skb_shinfo(skb)->nr_frags; |
| 203 | if (i >= MAX_SKB_FRAGS) { |
| 204 | pr_debug("%s: packet too long\n", skb->dev->name); |
| 205 | skb->dev->stats.rx_length_errors++; |
| 206 | return -EINVAL; |
| 207 | } |
| 208 | |
| 209 | page = vi->rvq->vq_ops->get_buf(vi->rvq, &len); |
| 210 | if (!page) { |
| 211 | pr_debug("%s: rx error: %d buffers missing\n", |
| 212 | skb->dev->name, hdr->mhdr.num_buffers); |
| 213 | skb->dev->stats.rx_length_errors++; |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | if (len > PAGE_SIZE) |
| 217 | len = PAGE_SIZE; |
| 218 | |
| 219 | set_skb_frag(skb, page, 0, &len); |
| 220 | |
| 221 | --vi->num; |
| 222 | } |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static void receive_buf(struct net_device *dev, void *buf, unsigned int len) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 227 | { |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 228 | struct virtnet_info *vi = netdev_priv(dev); |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 229 | struct sk_buff *skb; |
| 230 | struct page *page; |
| 231 | struct skb_vnet_hdr *hdr; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 232 | |
| 233 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
| 234 | pr_debug("%s: short packet %i\n", dev->name, len); |
| 235 | dev->stats.rx_length_errors++; |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 236 | if (vi->mergeable_rx_bufs || vi->big_packets) |
| 237 | give_pages(vi, buf); |
| 238 | else |
| 239 | dev_kfree_skb(buf); |
| 240 | return; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 241 | } |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 242 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 243 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
| 244 | skb = buf; |
| 245 | len -= sizeof(struct virtio_net_hdr); |
| 246 | skb_trim(skb, len); |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 247 | } else { |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 248 | page = buf; |
| 249 | skb = page_to_skb(vi, page, len); |
| 250 | if (unlikely(!skb)) { |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 251 | dev->stats.rx_dropped++; |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 252 | give_pages(vi, page); |
| 253 | return; |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 254 | } |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 255 | if (vi->mergeable_rx_bufs) |
| 256 | if (receive_mergeable(vi, skb)) { |
| 257 | dev_kfree_skb(skb); |
| 258 | return; |
| 259 | } |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 260 | } |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 261 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 262 | hdr = skb_vnet_hdr(skb); |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 263 | skb->truesize += skb->data_len; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 264 | dev->stats.rx_bytes += skb->len; |
| 265 | dev->stats.rx_packets++; |
| 266 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 267 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 268 | pr_debug("Needs csum!\n"); |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 269 | if (!skb_partial_csum_set(skb, |
| 270 | hdr->hdr.csum_start, |
| 271 | hdr->hdr.csum_offset)) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 272 | goto frame_err; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 273 | } |
| 274 | |
Mark McLoughlin | 23cde76 | 2008-06-08 20:49:00 +1000 | [diff] [blame] | 275 | skb->protocol = eth_type_trans(skb, dev); |
| 276 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", |
| 277 | ntohs(skb->protocol), skb->len, skb->pkt_type); |
| 278 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 279 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 280 | pr_debug("GSO!\n"); |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 281 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 282 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 283 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
| 284 | break; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 285 | case VIRTIO_NET_HDR_GSO_UDP: |
| 286 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
| 287 | break; |
| 288 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 289 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 290 | break; |
| 291 | default: |
| 292 | if (net_ratelimit()) |
| 293 | printk(KERN_WARNING "%s: bad gso type %u.\n", |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 294 | dev->name, hdr->hdr.gso_type); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 295 | goto frame_err; |
| 296 | } |
| 297 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 298 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
Rusty Russell | 34a4857 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 299 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 300 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 301 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 302 | if (skb_shinfo(skb)->gso_size == 0) { |
| 303 | if (net_ratelimit()) |
| 304 | printk(KERN_WARNING "%s: zero gso size.\n", |
| 305 | dev->name); |
| 306 | goto frame_err; |
| 307 | } |
| 308 | |
| 309 | /* Header must be checked, and gso_segs computed. */ |
| 310 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 311 | skb_shinfo(skb)->gso_segs = 0; |
| 312 | } |
| 313 | |
| 314 | netif_receive_skb(skb); |
| 315 | return; |
| 316 | |
| 317 | frame_err: |
| 318 | dev->stats.rx_frame_errors++; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 319 | dev_kfree_skb(skb); |
| 320 | } |
| 321 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 322 | static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 323 | { |
| 324 | struct sk_buff *skb; |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 325 | struct skb_vnet_hdr *hdr; |
| 326 | struct scatterlist sg[2]; |
| 327 | int err; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 328 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 329 | skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN); |
| 330 | if (unlikely(!skb)) |
| 331 | return -ENOMEM; |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 332 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 333 | skb_put(skb, MAX_PACKET_LEN); |
| 334 | |
| 335 | hdr = skb_vnet_hdr(skb); |
| 336 | sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr); |
| 337 | |
| 338 | skb_to_sgvec(skb, sg + 1, 0, skb->len); |
| 339 | |
| 340 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb); |
| 341 | if (err < 0) |
| 342 | dev_kfree_skb(skb); |
| 343 | |
| 344 | return err; |
| 345 | } |
| 346 | |
| 347 | static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) |
| 348 | { |
| 349 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; |
| 350 | struct page *first, *list = NULL; |
| 351 | char *p; |
| 352 | int i, err, offset; |
| 353 | |
| 354 | /* page in sg[MAX_SKB_FRAGS + 1] is list tail */ |
| 355 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
| 356 | first = get_a_page(vi, gfp); |
| 357 | if (!first) { |
| 358 | if (list) |
| 359 | give_pages(vi, list); |
| 360 | return -ENOMEM; |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 361 | } |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 362 | sg_set_buf(&sg[i], page_address(first), PAGE_SIZE); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 363 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 364 | /* chain new page in list head to match sg */ |
| 365 | first->private = (unsigned long)list; |
| 366 | list = first; |
| 367 | } |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 368 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 369 | first = get_a_page(vi, gfp); |
| 370 | if (!first) { |
| 371 | give_pages(vi, list); |
| 372 | return -ENOMEM; |
| 373 | } |
| 374 | p = page_address(first); |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 375 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 376 | /* sg[0], sg[1] share the same page */ |
| 377 | /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/ |
| 378 | sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr)); |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 379 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 380 | /* sg[1] for data packet, from offset */ |
| 381 | offset = sizeof(struct padded_vnet_hdr); |
| 382 | sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset); |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 383 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 384 | /* chain first in list head */ |
| 385 | first->private = (unsigned long)list; |
| 386 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2, |
| 387 | first); |
| 388 | if (err < 0) |
| 389 | give_pages(vi, first); |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 390 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 391 | return err; |
| 392 | } |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 393 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 394 | static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) |
| 395 | { |
| 396 | struct page *page; |
| 397 | struct scatterlist sg; |
| 398 | int err; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 399 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 400 | page = get_a_page(vi, gfp); |
| 401 | if (!page) |
| 402 | return -ENOMEM; |
| 403 | |
| 404 | sg_init_one(&sg, page_address(page), PAGE_SIZE); |
| 405 | |
| 406 | err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page); |
| 407 | if (err < 0) |
| 408 | give_pages(vi, page); |
| 409 | |
| 410 | return err; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 411 | } |
| 412 | |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 413 | /* Returns false if we couldn't fill entirely (OOM). */ |
| 414 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 415 | { |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 416 | int err; |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 417 | bool oom = false; |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 418 | |
Amit Shah | 0aea51c | 2009-08-26 14:58:28 +0530 | [diff] [blame] | 419 | do { |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 420 | if (vi->mergeable_rx_bufs) |
| 421 | err = add_recvbuf_mergeable(vi, gfp); |
| 422 | else if (vi->big_packets) |
| 423 | err = add_recvbuf_big(vi, gfp); |
| 424 | else |
| 425 | err = add_recvbuf_small(vi, gfp); |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 426 | |
Rusty Russell | 3c1b27d | 2009-09-23 22:26:31 -0600 | [diff] [blame] | 427 | if (err < 0) { |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 428 | oom = true; |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 429 | break; |
| 430 | } |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 431 | ++vi->num; |
Amit Shah | 0aea51c | 2009-08-26 14:58:28 +0530 | [diff] [blame] | 432 | } while (err > 0); |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 433 | if (unlikely(vi->num > vi->max)) |
| 434 | vi->max = vi->num; |
| 435 | vi->rvq->vq_ops->kick(vi->rvq); |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 436 | return !oom; |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 437 | } |
| 438 | |
Rusty Russell | 18445c4 | 2008-02-04 23:49:57 -0500 | [diff] [blame] | 439 | static void skb_recv_done(struct virtqueue *rvq) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 440 | { |
| 441 | struct virtnet_info *vi = rvq->vdev->priv; |
Rusty Russell | 18445c4 | 2008-02-04 23:49:57 -0500 | [diff] [blame] | 442 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 443 | if (napi_schedule_prep(&vi->napi)) { |
Rusty Russell | 18445c4 | 2008-02-04 23:49:57 -0500 | [diff] [blame] | 444 | rvq->vq_ops->disable_cb(rvq); |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 445 | __napi_schedule(&vi->napi); |
Rusty Russell | 18445c4 | 2008-02-04 23:49:57 -0500 | [diff] [blame] | 446 | } |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 447 | } |
| 448 | |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 449 | static void refill_work(struct work_struct *work) |
| 450 | { |
| 451 | struct virtnet_info *vi; |
| 452 | bool still_empty; |
| 453 | |
| 454 | vi = container_of(work, struct virtnet_info, refill.work); |
| 455 | napi_disable(&vi->napi); |
Herbert Xu | 39d3215 | 2010-01-25 15:51:01 -0800 | [diff] [blame] | 456 | still_empty = !try_fill_recv(vi, GFP_KERNEL); |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 457 | napi_enable(&vi->napi); |
| 458 | |
| 459 | /* In theory, this can happen: if we don't get any buffers in |
| 460 | * we will *never* try to fill again. */ |
| 461 | if (still_empty) |
| 462 | schedule_delayed_work(&vi->refill, HZ/2); |
| 463 | } |
| 464 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 465 | static int virtnet_poll(struct napi_struct *napi, int budget) |
| 466 | { |
| 467 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 468 | void *buf; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 469 | unsigned int len, received = 0; |
| 470 | |
| 471 | again: |
| 472 | while (received < budget && |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 473 | (buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { |
| 474 | receive_buf(vi->dev, buf, len); |
| 475 | --vi->num; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 476 | received++; |
| 477 | } |
| 478 | |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 479 | if (vi->num < vi->max / 2) { |
| 480 | if (!try_fill_recv(vi, GFP_ATOMIC)) |
| 481 | schedule_delayed_work(&vi->refill, 0); |
| 482 | } |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 483 | |
Rusty Russell | 8329d98 | 2007-11-19 11:20:43 -0500 | [diff] [blame] | 484 | /* Out of packets? */ |
| 485 | if (received < budget) { |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 486 | napi_complete(napi); |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 487 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) && |
| 488 | napi_schedule_prep(napi)) { |
Christian Borntraeger | 4265f16 | 2008-03-14 14:17:05 +0100 | [diff] [blame] | 489 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 490 | __napi_schedule(napi); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 491 | goto again; |
Christian Borntraeger | 4265f16 | 2008-03-14 14:17:05 +0100 | [diff] [blame] | 492 | } |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | return received; |
| 496 | } |
| 497 | |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 498 | static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 499 | { |
| 500 | struct sk_buff *skb; |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 501 | unsigned int len, tot_sgs = 0; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 502 | |
| 503 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { |
| 504 | pr_debug("Sent skb %p\n", skb); |
Rusty Russell | 655aa31 | 2008-05-02 21:50:43 -0500 | [diff] [blame] | 505 | vi->dev->stats.tx_bytes += skb->len; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 506 | vi->dev->stats.tx_packets++; |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 507 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
Eric Dumazet | ed79bab | 2009-10-14 14:36:43 +0000 | [diff] [blame] | 508 | dev_kfree_skb_any(skb); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 509 | } |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 510 | return tot_sgs; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 511 | } |
| 512 | |
Rusty Russell | 99ffc69 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 513 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 514 | { |
Rusty Russell | 0527168 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 515 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 516 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 517 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 518 | |
Rusty Russell | 0527168 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 519 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
Rusty Russell | 4d125de | 2007-11-07 16:34:49 +1100 | [diff] [blame] | 520 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 521 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 522 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 523 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 524 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 525 | hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb); |
| 526 | hdr->hdr.csum_offset = skb->csum_offset; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 527 | } else { |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 528 | hdr->hdr.flags = 0; |
| 529 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | if (skb_is_gso(skb)) { |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 533 | hdr->hdr.hdr_len = skb_headlen(skb); |
| 534 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; |
Rusty Russell | 34a4857 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 535 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 536 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 537 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 538 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 539 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 540 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 541 | else |
| 542 | BUG(); |
Rusty Russell | 34a4857 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 543 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 544 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 545 | } else { |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 546 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 547 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 548 | } |
| 549 | |
Rusty Russell | b3f2469 | 2009-09-24 09:59:19 -0600 | [diff] [blame] | 550 | hdr->mhdr.num_buffers = 0; |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 551 | |
| 552 | /* Encode metadata header at front. */ |
| 553 | if (vi->mergeable_rx_bufs) |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 554 | sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr); |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 555 | else |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 556 | sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr); |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 557 | |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 558 | hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
| 559 | return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb); |
Rusty Russell | 11a3a15 | 2008-05-26 17:48:13 +1000 | [diff] [blame] | 560 | } |
| 561 | |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 562 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
Rusty Russell | 99ffc69 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 563 | { |
| 564 | struct virtnet_info *vi = netdev_priv(dev); |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 565 | int capacity; |
Rusty Russell | 2cb9c6b | 2008-02-04 23:50:07 -0500 | [diff] [blame] | 566 | |
| 567 | again: |
| 568 | /* Free up any pending old buffers before queueing new ones. */ |
| 569 | free_old_xmit_skbs(vi); |
Rusty Russell | 2cb9c6b | 2008-02-04 23:50:07 -0500 | [diff] [blame] | 570 | |
Michael S. Tsirkin | 03f191b | 2009-10-28 04:03:38 -0700 | [diff] [blame] | 571 | /* Try to transmit */ |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 572 | capacity = xmit_skb(vi, skb); |
| 573 | |
| 574 | /* This can happen with OOM and indirect buffers. */ |
| 575 | if (unlikely(capacity < 0)) { |
| 576 | netif_stop_queue(dev); |
| 577 | dev_warn(&dev->dev, "Unexpected full queue\n"); |
| 578 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { |
| 579 | vi->svq->vq_ops->disable_cb(vi->svq); |
| 580 | netif_start_queue(dev); |
| 581 | goto again; |
| 582 | } |
| 583 | return NETDEV_TX_BUSY; |
Rusty Russell | 99ffc69 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 584 | } |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 585 | vi->svq->vq_ops->kick(vi->svq); |
Michael S. Tsirkin | 03f191b | 2009-10-28 04:03:38 -0700 | [diff] [blame] | 586 | |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 587 | /* Don't wait up for transmitted skbs to be freed. */ |
| 588 | skb_orphan(skb); |
| 589 | nf_reset(skb); |
Rusty Russell | 99ffc69 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 590 | |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 591 | /* Apparently nice girls don't return TX_BUSY; stop the queue |
| 592 | * before it gets out of hand. Naturally, this wastes entries. */ |
| 593 | if (capacity < 2+MAX_SKB_FRAGS) { |
| 594 | netif_stop_queue(dev); |
| 595 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { |
| 596 | /* More just got used, free them then recheck. */ |
| 597 | capacity += free_old_xmit_skbs(vi); |
| 598 | if (capacity >= 2+MAX_SKB_FRAGS) { |
| 599 | netif_start_queue(dev); |
| 600 | vi->svq->vq_ops->disable_cb(vi->svq); |
| 601 | } |
| 602 | } |
Rusty Russell | 99ffc69 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 603 | } |
Rusty Russell | 48925e3 | 2009-09-24 09:59:20 -0600 | [diff] [blame] | 604 | |
| 605 | return NETDEV_TX_OK; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 606 | } |
| 607 | |
Alex Williamson | 9c46f6d | 2009-02-04 16:36:34 -0800 | [diff] [blame] | 608 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
| 609 | { |
| 610 | struct virtnet_info *vi = netdev_priv(dev); |
| 611 | struct virtio_device *vdev = vi->vdev; |
| 612 | int ret; |
| 613 | |
| 614 | ret = eth_mac_addr(dev, p); |
| 615 | if (ret) |
| 616 | return ret; |
| 617 | |
Alex Williamson | 62994b2 | 2009-04-04 16:40:19 -0700 | [diff] [blame] | 618 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
| 619 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), |
| 620 | dev->dev_addr, dev->addr_len); |
Alex Williamson | 9c46f6d | 2009-02-04 16:36:34 -0800 | [diff] [blame] | 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
Amit Shah | da74e89 | 2008-02-29 16:24:50 +0530 | [diff] [blame] | 625 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 626 | static void virtnet_netpoll(struct net_device *dev) |
| 627 | { |
| 628 | struct virtnet_info *vi = netdev_priv(dev); |
| 629 | |
| 630 | napi_schedule(&vi->napi); |
| 631 | } |
| 632 | #endif |
| 633 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 634 | static int virtnet_open(struct net_device *dev) |
| 635 | { |
| 636 | struct virtnet_info *vi = netdev_priv(dev); |
| 637 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 638 | napi_enable(&vi->napi); |
Rusty Russell | a48bd8f | 2008-02-04 23:50:07 -0500 | [diff] [blame] | 639 | |
| 640 | /* If all buffers were filled by other side before we napi_enabled, we |
| 641 | * won't get another interrupt, so process any outstanding packets |
Christian Borntraeger | 370076d | 2008-02-06 08:50:11 +0100 | [diff] [blame] | 642 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
| 643 | * We synchronize against interrupts via NAPI_STATE_SCHED */ |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 644 | if (napi_schedule_prep(&vi->napi)) { |
Christian Borntraeger | 370076d | 2008-02-06 08:50:11 +0100 | [diff] [blame] | 645 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
Ben Hutchings | 288379f | 2009-01-19 16:43:59 -0800 | [diff] [blame] | 646 | __napi_schedule(&vi->napi); |
Christian Borntraeger | 370076d | 2008-02-06 08:50:11 +0100 | [diff] [blame] | 647 | } |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 648 | return 0; |
| 649 | } |
| 650 | |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 651 | /* |
| 652 | * Send command via the control virtqueue and check status. Commands |
| 653 | * supported by the hypervisor, as indicated by feature bits, should |
| 654 | * never fail unless improperly formated. |
| 655 | */ |
| 656 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, |
| 657 | struct scatterlist *data, int out, int in) |
| 658 | { |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 659 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 660 | struct virtio_net_ctrl_hdr ctrl; |
| 661 | virtio_net_ctrl_ack status = ~0; |
| 662 | unsigned int tmp; |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 663 | int i; |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 664 | |
Alexander Beregalov | 0ee904c | 2009-04-11 14:50:23 +0000 | [diff] [blame] | 665 | /* Caller should know better */ |
| 666 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || |
| 667 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 668 | |
| 669 | out++; /* Add header */ |
| 670 | in++; /* Add return status */ |
| 671 | |
| 672 | ctrl.class = class; |
| 673 | ctrl.cmd = cmd; |
| 674 | |
| 675 | sg_init_table(sg, out + in); |
| 676 | |
| 677 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 678 | for_each_sg(data, s, out + in - 2, i) |
| 679 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 680 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
| 681 | |
Rusty Russell | 3c1b27d | 2009-09-23 22:26:31 -0600 | [diff] [blame] | 682 | BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0); |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 683 | |
| 684 | vi->cvq->vq_ops->kick(vi->cvq); |
| 685 | |
| 686 | /* |
| 687 | * Spin for a response, the kick causes an ioport write, trapping |
| 688 | * into the hypervisor, so the request should be handled immediately. |
| 689 | */ |
| 690 | while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) |
| 691 | cpu_relax(); |
| 692 | |
| 693 | return status == VIRTIO_NET_OK; |
| 694 | } |
| 695 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 696 | static int virtnet_close(struct net_device *dev) |
| 697 | { |
| 698 | struct virtnet_info *vi = netdev_priv(dev); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 699 | |
| 700 | napi_disable(&vi->napi); |
| 701 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 702 | return 0; |
| 703 | } |
| 704 | |
Herbert Xu | a9ea3fc | 2008-04-18 11:21:42 +0800 | [diff] [blame] | 705 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
| 706 | { |
| 707 | struct virtnet_info *vi = netdev_priv(dev); |
| 708 | struct virtio_device *vdev = vi->vdev; |
| 709 | |
| 710 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) |
| 711 | return -ENOSYS; |
| 712 | |
| 713 | return ethtool_op_set_tx_hw_csum(dev, data); |
| 714 | } |
| 715 | |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 716 | static void virtnet_set_rx_mode(struct net_device *dev) |
| 717 | { |
| 718 | struct virtnet_info *vi = netdev_priv(dev); |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 719 | struct scatterlist sg[2]; |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 720 | u8 promisc, allmulti; |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 721 | struct virtio_net_ctrl_mac *mac_data; |
| 722 | struct dev_addr_list *addr; |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 723 | struct netdev_hw_addr *ha; |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 724 | int uc_count; |
Jiri Pirko | 4cd24ea | 2010-02-08 04:30:35 +0000 | [diff] [blame] | 725 | int mc_count; |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 726 | void *buf; |
| 727 | int i; |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 728 | |
| 729 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ |
| 730 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
| 731 | return; |
| 732 | |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 733 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
| 734 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 735 | |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 736 | sg_init_one(sg, &promisc, sizeof(promisc)); |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 737 | |
| 738 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, |
| 739 | VIRTIO_NET_CTRL_RX_PROMISC, |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 740 | sg, 1, 0)) |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 741 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
| 742 | promisc ? "en" : "dis"); |
| 743 | |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 744 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 745 | |
| 746 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, |
| 747 | VIRTIO_NET_CTRL_RX_ALLMULTI, |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 748 | sg, 1, 0)) |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 749 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
| 750 | allmulti ? "en" : "dis"); |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 751 | |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 752 | uc_count = netdev_uc_count(dev); |
Jiri Pirko | 4cd24ea | 2010-02-08 04:30:35 +0000 | [diff] [blame] | 753 | mc_count = netdev_mc_count(dev); |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 754 | /* MAC filter - use one buffer for both lists */ |
Jiri Pirko | 4cd24ea | 2010-02-08 04:30:35 +0000 | [diff] [blame] | 755 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
| 756 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); |
| 757 | mac_data = buf; |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 758 | if (!buf) { |
| 759 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); |
| 760 | return; |
| 761 | } |
| 762 | |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 763 | sg_init_table(sg, 2); |
| 764 | |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 765 | /* Store the unicast list and count in the front of the buffer */ |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 766 | mac_data->entries = uc_count; |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 767 | i = 0; |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 768 | netdev_for_each_uc_addr(ha, dev) |
Jiri Pirko | ccffad25 | 2009-05-22 23:22:17 +0000 | [diff] [blame] | 769 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 770 | |
| 771 | sg_set_buf(&sg[0], mac_data, |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 772 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 773 | |
| 774 | /* multicast list and count fill the end */ |
Jiri Pirko | 32e7bfc | 2010-01-25 13:36:10 -0800 | [diff] [blame] | 775 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 776 | |
Jiri Pirko | 4cd24ea | 2010-02-08 04:30:35 +0000 | [diff] [blame] | 777 | mac_data->entries = mc_count; |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 778 | addr = dev->mc_list; |
Jiri Pirko | 4cd24ea | 2010-02-08 04:30:35 +0000 | [diff] [blame] | 779 | for (i = 0; i < mc_count; i++, addr = addr->next) |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 780 | memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); |
| 781 | |
| 782 | sg_set_buf(&sg[1], mac_data, |
Jiri Pirko | 4cd24ea | 2010-02-08 04:30:35 +0000 | [diff] [blame] | 783 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
Alex Williamson | f565a7c | 2009-02-04 09:02:45 +0000 | [diff] [blame] | 784 | |
| 785 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, |
| 786 | VIRTIO_NET_CTRL_MAC_TABLE_SET, |
| 787 | sg, 2, 0)) |
| 788 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); |
| 789 | |
| 790 | kfree(buf); |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 791 | } |
| 792 | |
Alex Williamson | 1824a98 | 2009-05-01 17:31:10 +0000 | [diff] [blame] | 793 | static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
Alex Williamson | 0bde9569 | 2009-02-04 09:02:50 +0000 | [diff] [blame] | 794 | { |
| 795 | struct virtnet_info *vi = netdev_priv(dev); |
| 796 | struct scatterlist sg; |
| 797 | |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 798 | sg_init_one(&sg, &vid, sizeof(vid)); |
Alex Williamson | 0bde9569 | 2009-02-04 09:02:50 +0000 | [diff] [blame] | 799 | |
| 800 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, |
| 801 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) |
| 802 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
| 803 | } |
| 804 | |
Alex Williamson | 1824a98 | 2009-05-01 17:31:10 +0000 | [diff] [blame] | 805 | static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
Alex Williamson | 0bde9569 | 2009-02-04 09:02:50 +0000 | [diff] [blame] | 806 | { |
| 807 | struct virtnet_info *vi = netdev_priv(dev); |
| 808 | struct scatterlist sg; |
| 809 | |
Alex Williamson | 23e258e | 2009-05-01 17:27:56 +0000 | [diff] [blame] | 810 | sg_init_one(&sg, &vid, sizeof(vid)); |
Alex Williamson | 0bde9569 | 2009-02-04 09:02:50 +0000 | [diff] [blame] | 811 | |
| 812 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, |
| 813 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) |
| 814 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
| 815 | } |
| 816 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 817 | static const struct ethtool_ops virtnet_ethtool_ops = { |
Herbert Xu | a9ea3fc | 2008-04-18 11:21:42 +0800 | [diff] [blame] | 818 | .set_tx_csum = virtnet_set_tx_csum, |
| 819 | .set_sg = ethtool_op_set_sg, |
Mark McLoughlin | 0276b49 | 2008-11-16 22:40:36 -0800 | [diff] [blame] | 820 | .set_tso = ethtool_op_set_tso, |
Sridhar Samudrala | 5c51675 | 2009-07-14 14:21:02 +0000 | [diff] [blame] | 821 | .set_ufo = ethtool_op_set_ufo, |
Mark McLoughlin | 9f4d26d | 2009-01-19 17:09:49 -0800 | [diff] [blame] | 822 | .get_link = ethtool_op_get_link, |
Herbert Xu | a9ea3fc | 2008-04-18 11:21:42 +0800 | [diff] [blame] | 823 | }; |
| 824 | |
Mark McLoughlin | 39da581 | 2008-11-26 13:58:11 +0000 | [diff] [blame] | 825 | #define MIN_MTU 68 |
| 826 | #define MAX_MTU 65535 |
| 827 | |
| 828 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) |
| 829 | { |
| 830 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) |
| 831 | return -EINVAL; |
| 832 | dev->mtu = new_mtu; |
| 833 | return 0; |
| 834 | } |
| 835 | |
Stephen Hemminger | 76288b4 | 2009-01-06 10:44:22 -0800 | [diff] [blame] | 836 | static const struct net_device_ops virtnet_netdev = { |
| 837 | .ndo_open = virtnet_open, |
| 838 | .ndo_stop = virtnet_close, |
| 839 | .ndo_start_xmit = start_xmit, |
| 840 | .ndo_validate_addr = eth_validate_addr, |
Alex Williamson | 9c46f6d | 2009-02-04 16:36:34 -0800 | [diff] [blame] | 841 | .ndo_set_mac_address = virtnet_set_mac_address, |
Alex Williamson | 2af7698 | 2009-02-04 09:02:40 +0000 | [diff] [blame] | 842 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
Stephen Hemminger | 76288b4 | 2009-01-06 10:44:22 -0800 | [diff] [blame] | 843 | .ndo_change_mtu = virtnet_change_mtu, |
Alex Williamson | 1824a98 | 2009-05-01 17:31:10 +0000 | [diff] [blame] | 844 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
| 845 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, |
Stephen Hemminger | 76288b4 | 2009-01-06 10:44:22 -0800 | [diff] [blame] | 846 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 847 | .ndo_poll_controller = virtnet_netpoll, |
| 848 | #endif |
| 849 | }; |
| 850 | |
Mark McLoughlin | 9f4d26d | 2009-01-19 17:09:49 -0800 | [diff] [blame] | 851 | static void virtnet_update_status(struct virtnet_info *vi) |
| 852 | { |
| 853 | u16 v; |
| 854 | |
| 855 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) |
| 856 | return; |
| 857 | |
| 858 | vi->vdev->config->get(vi->vdev, |
| 859 | offsetof(struct virtio_net_config, status), |
| 860 | &v, sizeof(v)); |
| 861 | |
| 862 | /* Ignore unknown (future) status bits */ |
| 863 | v &= VIRTIO_NET_S_LINK_UP; |
| 864 | |
| 865 | if (vi->status == v) |
| 866 | return; |
| 867 | |
| 868 | vi->status = v; |
| 869 | |
| 870 | if (vi->status & VIRTIO_NET_S_LINK_UP) { |
| 871 | netif_carrier_on(vi->dev); |
| 872 | netif_wake_queue(vi->dev); |
| 873 | } else { |
| 874 | netif_carrier_off(vi->dev); |
| 875 | netif_stop_queue(vi->dev); |
| 876 | } |
| 877 | } |
| 878 | |
| 879 | static void virtnet_config_changed(struct virtio_device *vdev) |
| 880 | { |
| 881 | struct virtnet_info *vi = vdev->priv; |
| 882 | |
| 883 | virtnet_update_status(vi); |
| 884 | } |
| 885 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 886 | static int virtnet_probe(struct virtio_device *vdev) |
| 887 | { |
| 888 | int err; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 889 | struct net_device *dev; |
| 890 | struct virtnet_info *vi; |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 891 | struct virtqueue *vqs[3]; |
| 892 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; |
| 893 | const char *names[] = { "input", "output", "control" }; |
| 894 | int nvqs; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 895 | |
| 896 | /* Allocate ourselves a network device with room for our info */ |
| 897 | dev = alloc_etherdev(sizeof(struct virtnet_info)); |
| 898 | if (!dev) |
| 899 | return -ENOMEM; |
| 900 | |
| 901 | /* Set up network device as normal. */ |
Stephen Hemminger | 76288b4 | 2009-01-06 10:44:22 -0800 | [diff] [blame] | 902 | dev->netdev_ops = &virtnet_netdev; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 903 | dev->features = NETIF_F_HIGHDMA; |
Herbert Xu | a9ea3fc | 2008-04-18 11:21:42 +0800 | [diff] [blame] | 904 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 905 | SET_NETDEV_DEV(dev, &vdev->dev); |
| 906 | |
| 907 | /* Do we support "hardware" checksums? */ |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 908 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 909 | /* This opens up the world of extra features. */ |
| 910 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 911 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
Rusty Russell | 34a4857 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 912 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
| 913 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
| 914 | } |
Rusty Russell | 5539ae9 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 915 | /* Individual feature bits: what can host handle? */ |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 916 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
Rusty Russell | 5539ae9 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 917 | dev->features |= NETIF_F_TSO; |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 918 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
Rusty Russell | 5539ae9 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 919 | dev->features |= NETIF_F_TSO6; |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 920 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
Rusty Russell | 5539ae9 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 921 | dev->features |= NETIF_F_TSO_ECN; |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 922 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
Rusty Russell | 5539ae9 | 2008-05-02 21:50:46 -0500 | [diff] [blame] | 923 | dev->features |= NETIF_F_UFO; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 924 | } |
| 925 | |
| 926 | /* Configuration may specify what MAC to use. Otherwise random. */ |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 927 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 928 | vdev->config->get(vdev, |
| 929 | offsetof(struct virtio_net_config, mac), |
| 930 | dev->dev_addr, dev->addr_len); |
Alex Williamson | 62994b2 | 2009-04-04 16:40:19 -0700 | [diff] [blame] | 931 | } else |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 932 | random_ether_addr(dev->dev_addr); |
| 933 | |
| 934 | /* Set up our device-specific information */ |
| 935 | vi = netdev_priv(dev); |
Dor Laor | 6c0cd7c | 2007-12-16 15:19:43 +0200 | [diff] [blame] | 936 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 937 | vi->dev = dev; |
| 938 | vi->vdev = vdev; |
Christian Borntraeger | d9d5dcc | 2008-02-18 10:02:51 +0100 | [diff] [blame] | 939 | vdev->priv = vi; |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 940 | vi->pages = NULL; |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 941 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 942 | |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 943 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 944 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
| 945 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || |
| 946 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 947 | vi->big_packets = true; |
| 948 | |
Mark McLoughlin | 3f2c31d | 2008-11-16 22:41:34 -0800 | [diff] [blame] | 949 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
| 950 | vi->mergeable_rx_bufs = true; |
| 951 | |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 952 | /* We expect two virtqueues, receive then send, |
| 953 | * and optionally control. */ |
| 954 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 955 | |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 956 | err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names); |
| 957 | if (err) |
| 958 | goto free; |
| 959 | |
| 960 | vi->rvq = vqs[0]; |
| 961 | vi->svq = vqs[1]; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 962 | |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 963 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 964 | vi->cvq = vqs[2]; |
Alex Williamson | 0bde9569 | 2009-02-04 09:02:50 +0000 | [diff] [blame] | 965 | |
| 966 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
| 967 | dev->features |= NETIF_F_HW_VLAN_FILTER; |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 968 | } |
| 969 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 970 | err = register_netdev(dev); |
| 971 | if (err) { |
| 972 | pr_debug("virtio_net: registering device failed\n"); |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 973 | goto free_vqs; |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 974 | } |
Rusty Russell | b3369c1 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 975 | |
| 976 | /* Last of all, set up some receive buffers. */ |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 977 | try_fill_recv(vi, GFP_KERNEL); |
Rusty Russell | b3369c1 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 978 | |
| 979 | /* If we didn't even get one input buffer, we're useless. */ |
| 980 | if (vi->num == 0) { |
| 981 | err = -ENOMEM; |
| 982 | goto unregister; |
| 983 | } |
| 984 | |
Mark McLoughlin | 9f4d26d | 2009-01-19 17:09:49 -0800 | [diff] [blame] | 985 | vi->status = VIRTIO_NET_S_LINK_UP; |
| 986 | virtnet_update_status(vi); |
Pantelis Koukousoulas | 4783256 | 2009-03-18 18:40:02 -0700 | [diff] [blame] | 987 | netif_carrier_on(dev); |
Mark McLoughlin | 9f4d26d | 2009-01-19 17:09:49 -0800 | [diff] [blame] | 988 | |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 989 | pr_debug("virtnet: registered device %s\n", dev->name); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 990 | return 0; |
| 991 | |
Rusty Russell | b3369c1 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 992 | unregister: |
| 993 | unregister_netdev(dev); |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 994 | cancel_delayed_work_sync(&vi->refill); |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 995 | free_vqs: |
| 996 | vdev->config->del_vqs(vdev); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 997 | free: |
| 998 | free_netdev(dev); |
| 999 | return err; |
| 1000 | } |
| 1001 | |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 1002 | static void free_unused_bufs(struct virtnet_info *vi) |
| 1003 | { |
| 1004 | void *buf; |
| 1005 | while (1) { |
Shirley Ma | 830a8a9 | 2010-02-08 14:14:42 +0000 | [diff] [blame] | 1006 | buf = vi->svq->vq_ops->detach_unused_buf(vi->svq); |
| 1007 | if (!buf) |
| 1008 | break; |
| 1009 | dev_kfree_skb(buf); |
| 1010 | } |
| 1011 | while (1) { |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 1012 | buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq); |
| 1013 | if (!buf) |
| 1014 | break; |
| 1015 | if (vi->mergeable_rx_bufs || vi->big_packets) |
| 1016 | give_pages(vi, buf); |
| 1017 | else |
| 1018 | dev_kfree_skb(buf); |
| 1019 | --vi->num; |
| 1020 | } |
| 1021 | BUG_ON(vi->num != 0); |
| 1022 | } |
| 1023 | |
Uwe Kleine-König | 3d1285b | 2009-09-30 22:28:34 +0000 | [diff] [blame] | 1024 | static void __devexit virtnet_remove(struct virtio_device *vdev) |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 1025 | { |
Rusty Russell | 74b2553 | 2007-11-19 11:20:42 -0500 | [diff] [blame] | 1026 | struct virtnet_info *vi = vdev->priv; |
Rusty Russell | b3369c1 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 1027 | |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 1028 | /* Stop all the virtqueues. */ |
| 1029 | vdev->config->reset(vdev); |
| 1030 | |
Rusty Russell | b3369c1 | 2008-02-04 23:50:02 -0500 | [diff] [blame] | 1031 | |
Rusty Russell | 74b2553 | 2007-11-19 11:20:42 -0500 | [diff] [blame] | 1032 | unregister_netdev(vi->dev); |
Rusty Russell | 3161e45 | 2009-08-26 12:22:32 -0700 | [diff] [blame] | 1033 | cancel_delayed_work_sync(&vi->refill); |
Shirley Ma | 830a8a9 | 2010-02-08 14:14:42 +0000 | [diff] [blame] | 1034 | |
| 1035 | /* Free unused buffers in both send and recv, if any. */ |
Shirley Ma | 9ab86bb | 2010-01-29 03:20:04 +0000 | [diff] [blame] | 1036 | free_unused_bufs(vi); |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 1037 | |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 1038 | vdev->config->del_vqs(vi->vdev); |
| 1039 | |
Rusty Russell | fb6813f | 2008-07-25 12:06:01 -0500 | [diff] [blame] | 1040 | while (vi->pages) |
| 1041 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); |
| 1042 | |
Rusty Russell | 74b2553 | 2007-11-19 11:20:42 -0500 | [diff] [blame] | 1043 | free_netdev(vi->dev); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 1044 | } |
| 1045 | |
| 1046 | static struct virtio_device_id id_table[] = { |
| 1047 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, |
| 1048 | { 0 }, |
| 1049 | }; |
| 1050 | |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 1051 | static unsigned int features[] = { |
Mark McLoughlin | 5e4fe5c | 2008-07-08 17:10:42 +1000 | [diff] [blame] | 1052 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
| 1053 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 1054 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
Herbert Xu | 97402b9 | 2008-04-18 11:24:27 +0800 | [diff] [blame] | 1055 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
Sridhar Samudrala | 5c51675 | 2009-07-14 14:21:02 +0000 | [diff] [blame] | 1056 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
Alex Williamson | 2a41f71 | 2009-02-04 09:02:34 +0000 | [diff] [blame] | 1057 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
Alex Williamson | 0bde9569 | 2009-02-04 09:02:50 +0000 | [diff] [blame] | 1058 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 1059 | }; |
| 1060 | |
Uwe Kleine-König | 2240252 | 2009-11-05 01:32:44 -0800 | [diff] [blame] | 1061 | static struct virtio_driver virtio_net_driver = { |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 1062 | .feature_table = features, |
| 1063 | .feature_table_size = ARRAY_SIZE(features), |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 1064 | .driver.name = KBUILD_MODNAME, |
| 1065 | .driver.owner = THIS_MODULE, |
| 1066 | .id_table = id_table, |
| 1067 | .probe = virtnet_probe, |
| 1068 | .remove = __devexit_p(virtnet_remove), |
Mark McLoughlin | 9f4d26d | 2009-01-19 17:09:49 -0800 | [diff] [blame] | 1069 | .config_changed = virtnet_config_changed, |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 1070 | }; |
| 1071 | |
| 1072 | static int __init init(void) |
| 1073 | { |
Uwe Kleine-König | 2240252 | 2009-11-05 01:32:44 -0800 | [diff] [blame] | 1074 | return register_virtio_driver(&virtio_net_driver); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 1075 | } |
| 1076 | |
| 1077 | static void __exit fini(void) |
| 1078 | { |
Uwe Kleine-König | 2240252 | 2009-11-05 01:32:44 -0800 | [diff] [blame] | 1079 | unregister_virtio_driver(&virtio_net_driver); |
Rusty Russell | 296f96f | 2007-10-22 11:03:37 +1000 | [diff] [blame] | 1080 | } |
| 1081 | module_init(init); |
| 1082 | module_exit(fini); |
| 1083 | |
| 1084 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 1085 | MODULE_DESCRIPTION("Virtio network driver"); |
| 1086 | MODULE_LICENSE("GPL"); |