Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 1 | /* Copyright (C) 2009 Red Hat, Inc. |
| 2 | * Author: Michael S. Tsirkin <mst@redhat.com> |
| 3 | * |
| 4 | * This work is licensed under the terms of the GNU GPL, version 2. |
| 5 | * |
| 6 | * virtio-net server in host kernel. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/compat.h> |
| 10 | #include <linux/eventfd.h> |
| 11 | #include <linux/vhost.h> |
| 12 | #include <linux/virtio_net.h> |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 13 | #include <linux/miscdevice.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/mutex.h> |
| 16 | #include <linux/workqueue.h> |
| 17 | #include <linux/rcupdate.h> |
| 18 | #include <linux/file.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 20 | |
| 21 | #include <linux/net.h> |
| 22 | #include <linux/if_packet.h> |
| 23 | #include <linux/if_arp.h> |
| 24 | #include <linux/if_tun.h> |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 25 | #include <linux/if_macvlan.h> |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 26 | |
| 27 | #include <net/sock.h> |
| 28 | |
| 29 | #include "vhost.h" |
| 30 | |
| 31 | /* Max number of bytes transferred before requeueing the job. |
| 32 | * Using this limit prevents one virtqueue from starving others. */ |
| 33 | #define VHOST_NET_WEIGHT 0x80000 |
| 34 | |
| 35 | enum { |
| 36 | VHOST_NET_VQ_RX = 0, |
| 37 | VHOST_NET_VQ_TX = 1, |
| 38 | VHOST_NET_VQ_MAX = 2, |
| 39 | }; |
| 40 | |
| 41 | enum vhost_net_poll_state { |
| 42 | VHOST_NET_POLL_DISABLED = 0, |
| 43 | VHOST_NET_POLL_STARTED = 1, |
| 44 | VHOST_NET_POLL_STOPPED = 2, |
| 45 | }; |
| 46 | |
| 47 | struct vhost_net { |
| 48 | struct vhost_dev dev; |
| 49 | struct vhost_virtqueue vqs[VHOST_NET_VQ_MAX]; |
| 50 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
| 51 | /* Tells us whether we are polling a socket for TX. |
| 52 | * We only do this when socket buffer fills up. |
| 53 | * Protected by tx vq lock. */ |
| 54 | enum vhost_net_poll_state tx_poll_state; |
| 55 | }; |
| 56 | |
| 57 | /* Pop first len bytes from iovec. Return number of segments used. */ |
| 58 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, |
| 59 | size_t len, int iov_count) |
| 60 | { |
| 61 | int seg = 0; |
| 62 | size_t size; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 63 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 64 | while (len && seg < iov_count) { |
| 65 | size = min(from->iov_len, len); |
| 66 | to->iov_base = from->iov_base; |
| 67 | to->iov_len = size; |
| 68 | from->iov_len -= size; |
| 69 | from->iov_base += size; |
| 70 | len -= size; |
| 71 | ++from; |
| 72 | ++to; |
| 73 | ++seg; |
| 74 | } |
| 75 | return seg; |
| 76 | } |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 77 | /* Copy iovec entries for len bytes from iovec. */ |
| 78 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, |
| 79 | size_t len, int iovcount) |
| 80 | { |
| 81 | int seg = 0; |
| 82 | size_t size; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 83 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 84 | while (len && seg < iovcount) { |
| 85 | size = min(from->iov_len, len); |
| 86 | to->iov_base = from->iov_base; |
| 87 | to->iov_len = size; |
| 88 | len -= size; |
| 89 | ++from; |
| 90 | ++to; |
| 91 | ++seg; |
| 92 | } |
| 93 | } |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 94 | |
| 95 | /* Caller must have TX VQ lock */ |
| 96 | static void tx_poll_stop(struct vhost_net *net) |
| 97 | { |
| 98 | if (likely(net->tx_poll_state != VHOST_NET_POLL_STARTED)) |
| 99 | return; |
| 100 | vhost_poll_stop(net->poll + VHOST_NET_VQ_TX); |
| 101 | net->tx_poll_state = VHOST_NET_POLL_STOPPED; |
| 102 | } |
| 103 | |
| 104 | /* Caller must have TX VQ lock */ |
| 105 | static void tx_poll_start(struct vhost_net *net, struct socket *sock) |
| 106 | { |
| 107 | if (unlikely(net->tx_poll_state != VHOST_NET_POLL_STOPPED)) |
| 108 | return; |
| 109 | vhost_poll_start(net->poll + VHOST_NET_VQ_TX, sock->file); |
| 110 | net->tx_poll_state = VHOST_NET_POLL_STARTED; |
| 111 | } |
| 112 | |
| 113 | /* Expects to be always run from workqueue - which acts as |
| 114 | * read-size critical section for our kind of RCU. */ |
| 115 | static void handle_tx(struct vhost_net *net) |
| 116 | { |
| 117 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX]; |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 118 | unsigned out, in, s; |
| 119 | int head; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 120 | struct msghdr msg = { |
| 121 | .msg_name = NULL, |
| 122 | .msg_namelen = 0, |
| 123 | .msg_control = NULL, |
| 124 | .msg_controllen = 0, |
| 125 | .msg_iov = vq->iov, |
| 126 | .msg_flags = MSG_DONTWAIT, |
| 127 | }; |
| 128 | size_t len, total_len = 0; |
| 129 | int err, wmem; |
| 130 | size_t hdr_size; |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 131 | struct socket *sock; |
| 132 | |
Michael S. Tsirkin | 5e18247 | 2011-01-18 13:04:43 +0200 | [diff] [blame] | 133 | /* TODO: check that we are running from vhost_worker? */ |
Michael S. Tsirkin | 11cd1a8 | 2010-11-14 17:31:52 +0200 | [diff] [blame] | 134 | sock = rcu_dereference_check(vq->private_data, 1); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 135 | if (!sock) |
| 136 | return; |
| 137 | |
| 138 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); |
Sridhar Samudrala | 39286fa | 2010-02-28 19:39:16 +0200 | [diff] [blame] | 139 | if (wmem >= sock->sk->sk_sndbuf) { |
| 140 | mutex_lock(&vq->mutex); |
| 141 | tx_poll_start(net, sock); |
| 142 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 143 | return; |
Sridhar Samudrala | 39286fa | 2010-02-28 19:39:16 +0200 | [diff] [blame] | 144 | } |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 145 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 146 | mutex_lock(&vq->mutex); |
| 147 | vhost_disable_notify(vq); |
| 148 | |
Michael S. Tsirkin | 0e25557 | 2010-03-08 23:24:22 +0200 | [diff] [blame] | 149 | if (wmem < sock->sk->sk_sndbuf / 2) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 150 | tx_poll_stop(net); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 151 | hdr_size = vq->vhost_hlen; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 152 | |
| 153 | for (;;) { |
| 154 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
| 155 | ARRAY_SIZE(vq->iov), |
| 156 | &out, &in, |
| 157 | NULL, NULL); |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 158 | /* On error, stop handling until the next kick. */ |
Michael S. Tsirkin | 7b3384f | 2010-07-01 18:40:12 +0300 | [diff] [blame] | 159 | if (unlikely(head < 0)) |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 160 | break; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 161 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
| 162 | if (head == vq->num) { |
| 163 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); |
| 164 | if (wmem >= sock->sk->sk_sndbuf * 3 / 4) { |
| 165 | tx_poll_start(net, sock); |
| 166 | set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
| 167 | break; |
| 168 | } |
| 169 | if (unlikely(vhost_enable_notify(vq))) { |
| 170 | vhost_disable_notify(vq); |
| 171 | continue; |
| 172 | } |
| 173 | break; |
| 174 | } |
| 175 | if (in) { |
| 176 | vq_err(vq, "Unexpected descriptor format for TX: " |
| 177 | "out %d, int %d\n", out, in); |
| 178 | break; |
| 179 | } |
| 180 | /* Skip header. TODO: support TSO. */ |
| 181 | s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out); |
| 182 | msg.msg_iovlen = out; |
| 183 | len = iov_length(vq->iov, out); |
| 184 | /* Sanity check */ |
| 185 | if (!len) { |
| 186 | vq_err(vq, "Unexpected header len for TX: " |
| 187 | "%zd expected %zd\n", |
| 188 | iov_length(vq->hdr, s), hdr_size); |
| 189 | break; |
| 190 | } |
| 191 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
| 192 | err = sock->ops->sendmsg(NULL, sock, &msg, len); |
| 193 | if (unlikely(err < 0)) { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 194 | vhost_discard_vq_desc(vq, 1); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 195 | tx_poll_start(net, sock); |
| 196 | break; |
| 197 | } |
| 198 | if (err != len) |
Michael S. Tsirkin | 95c0ec6 | 2010-06-24 17:10:25 +0300 | [diff] [blame] | 199 | pr_debug("Truncated TX packet: " |
| 200 | " len %d != %zd\n", err, len); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 201 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
| 202 | total_len += len; |
| 203 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
| 204 | vhost_poll_queue(&vq->poll); |
| 205 | break; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 210 | } |
| 211 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 212 | static int peek_head_len(struct sock *sk) |
| 213 | { |
| 214 | struct sk_buff *head; |
| 215 | int len = 0; |
| 216 | |
| 217 | lock_sock(sk); |
| 218 | head = skb_peek(&sk->sk_receive_queue); |
| 219 | if (head) |
| 220 | len = head->len; |
| 221 | release_sock(sk); |
| 222 | return len; |
| 223 | } |
| 224 | |
| 225 | /* This is a multi-buffer version of vhost_get_desc, that works if |
| 226 | * vq has read descriptors only. |
| 227 | * @vq - the relevant virtqueue |
| 228 | * @datalen - data length we'll be reading |
| 229 | * @iovcount - returned count of io vectors we fill |
| 230 | * @log - vhost log |
| 231 | * @log_num - log offset |
| 232 | * returns number of buffer heads allocated, negative on error |
| 233 | */ |
| 234 | static int get_rx_bufs(struct vhost_virtqueue *vq, |
| 235 | struct vring_used_elem *heads, |
| 236 | int datalen, |
| 237 | unsigned *iovcount, |
| 238 | struct vhost_log *log, |
| 239 | unsigned *log_num) |
| 240 | { |
| 241 | unsigned int out, in; |
| 242 | int seg = 0; |
| 243 | int headcount = 0; |
| 244 | unsigned d; |
| 245 | int r, nlogs = 0; |
| 246 | |
| 247 | while (datalen > 0) { |
Jason Wang | e0e9b40 | 2010-09-14 23:53:05 +0800 | [diff] [blame] | 248 | if (unlikely(seg >= UIO_MAXIOV)) { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 249 | r = -ENOBUFS; |
| 250 | goto err; |
| 251 | } |
| 252 | d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg, |
| 253 | ARRAY_SIZE(vq->iov) - seg, &out, |
| 254 | &in, log, log_num); |
| 255 | if (d == vq->num) { |
| 256 | r = 0; |
| 257 | goto err; |
| 258 | } |
| 259 | if (unlikely(out || in <= 0)) { |
| 260 | vq_err(vq, "unexpected descriptor format for RX: " |
| 261 | "out %d, in %d\n", out, in); |
| 262 | r = -EINVAL; |
| 263 | goto err; |
| 264 | } |
| 265 | if (unlikely(log)) { |
| 266 | nlogs += *log_num; |
| 267 | log += *log_num; |
| 268 | } |
| 269 | heads[headcount].id = d; |
| 270 | heads[headcount].len = iov_length(vq->iov + seg, in); |
| 271 | datalen -= heads[headcount].len; |
| 272 | ++headcount; |
| 273 | seg += in; |
| 274 | } |
| 275 | heads[headcount - 1].len += datalen; |
| 276 | *iovcount = seg; |
| 277 | if (unlikely(log)) |
| 278 | *log_num = nlogs; |
| 279 | return headcount; |
| 280 | err: |
| 281 | vhost_discard_vq_desc(vq, headcount); |
| 282 | return r; |
| 283 | } |
| 284 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 285 | /* Expects to be always run from workqueue - which acts as |
| 286 | * read-size critical section for our kind of RCU. */ |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 287 | static void handle_rx_big(struct vhost_net *net) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 288 | { |
| 289 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX]; |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 290 | unsigned out, in, log, s; |
| 291 | int head; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 292 | struct vhost_log *vq_log; |
| 293 | struct msghdr msg = { |
| 294 | .msg_name = NULL, |
| 295 | .msg_namelen = 0, |
| 296 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ |
| 297 | .msg_controllen = 0, |
| 298 | .msg_iov = vq->iov, |
| 299 | .msg_flags = MSG_DONTWAIT, |
| 300 | }; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 301 | struct virtio_net_hdr hdr = { |
| 302 | .flags = 0, |
| 303 | .gso_type = VIRTIO_NET_HDR_GSO_NONE |
| 304 | }; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 305 | size_t len, total_len = 0; |
| 306 | int err; |
| 307 | size_t hdr_size; |
Michael S. Tsirkin | 5e18247 | 2011-01-18 13:04:43 +0200 | [diff] [blame] | 308 | /* TODO: check that we are running from vhost_worker? */ |
| 309 | struct socket *sock = rcu_dereference_check(vq->private_data, 1); |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 310 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 311 | if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue)) |
| 312 | return; |
| 313 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 314 | mutex_lock(&vq->mutex); |
| 315 | vhost_disable_notify(vq); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 316 | hdr_size = vq->vhost_hlen; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 317 | |
| 318 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? |
| 319 | vq->log : NULL; |
| 320 | |
| 321 | for (;;) { |
| 322 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
| 323 | ARRAY_SIZE(vq->iov), |
| 324 | &out, &in, |
| 325 | vq_log, &log); |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 326 | /* On error, stop handling until the next kick. */ |
Michael S. Tsirkin | 7b3384f | 2010-07-01 18:40:12 +0300 | [diff] [blame] | 327 | if (unlikely(head < 0)) |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 328 | break; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 329 | /* OK, now we need to know about added descriptors. */ |
| 330 | if (head == vq->num) { |
| 331 | if (unlikely(vhost_enable_notify(vq))) { |
| 332 | /* They have slipped one in as we were |
| 333 | * doing that: check again. */ |
| 334 | vhost_disable_notify(vq); |
| 335 | continue; |
| 336 | } |
| 337 | /* Nothing new? Wait for eventfd to tell us |
| 338 | * they refilled. */ |
| 339 | break; |
| 340 | } |
| 341 | /* We don't need to be notified again. */ |
| 342 | if (out) { |
| 343 | vq_err(vq, "Unexpected descriptor format for RX: " |
| 344 | "out %d, int %d\n", |
| 345 | out, in); |
| 346 | break; |
| 347 | } |
| 348 | /* Skip header. TODO: support TSO/mergeable rx buffers. */ |
| 349 | s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, in); |
| 350 | msg.msg_iovlen = in; |
| 351 | len = iov_length(vq->iov, in); |
| 352 | /* Sanity check */ |
| 353 | if (!len) { |
| 354 | vq_err(vq, "Unexpected header len for RX: " |
| 355 | "%zd expected %zd\n", |
| 356 | iov_length(vq->hdr, s), hdr_size); |
| 357 | break; |
| 358 | } |
| 359 | err = sock->ops->recvmsg(NULL, sock, &msg, |
| 360 | len, MSG_DONTWAIT | MSG_TRUNC); |
| 361 | /* TODO: Check specific error and bomb out unless EAGAIN? */ |
| 362 | if (err < 0) { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 363 | vhost_discard_vq_desc(vq, 1); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 364 | break; |
| 365 | } |
| 366 | /* TODO: Should check and handle checksum. */ |
| 367 | if (err > len) { |
Michael S. Tsirkin | 95c0ec6 | 2010-06-24 17:10:25 +0300 | [diff] [blame] | 368 | pr_debug("Discarded truncated rx packet: " |
| 369 | " len %d > %zd\n", err, len); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 370 | vhost_discard_vq_desc(vq, 1); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 371 | continue; |
| 372 | } |
| 373 | len = err; |
| 374 | err = memcpy_toiovec(vq->hdr, (unsigned char *)&hdr, hdr_size); |
| 375 | if (err) { |
| 376 | vq_err(vq, "Unable to write vnet_hdr at addr %p: %d\n", |
| 377 | vq->iov->iov_base, err); |
| 378 | break; |
| 379 | } |
| 380 | len += hdr_size; |
| 381 | vhost_add_used_and_signal(&net->dev, vq, head, len); |
| 382 | if (unlikely(vq_log)) |
| 383 | vhost_log_write(vq, vq_log, log, len); |
| 384 | total_len += len; |
| 385 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
| 386 | vhost_poll_queue(&vq->poll); |
| 387 | break; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 392 | } |
| 393 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 394 | /* Expects to be always run from workqueue - which acts as |
| 395 | * read-size critical section for our kind of RCU. */ |
| 396 | static void handle_rx_mergeable(struct vhost_net *net) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 397 | { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 398 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX]; |
| 399 | unsigned uninitialized_var(in), log; |
| 400 | struct vhost_log *vq_log; |
| 401 | struct msghdr msg = { |
| 402 | .msg_name = NULL, |
| 403 | .msg_namelen = 0, |
| 404 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ |
| 405 | .msg_controllen = 0, |
| 406 | .msg_iov = vq->iov, |
| 407 | .msg_flags = MSG_DONTWAIT, |
| 408 | }; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 409 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
| 410 | .hdr.flags = 0, |
| 411 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE |
| 412 | }; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 413 | size_t total_len = 0; |
| 414 | int err, headcount; |
| 415 | size_t vhost_hlen, sock_hlen; |
| 416 | size_t vhost_len, sock_len; |
Michael S. Tsirkin | 5e18247 | 2011-01-18 13:04:43 +0200 | [diff] [blame] | 417 | /* TODO: check that we are running from vhost_worker? */ |
| 418 | struct socket *sock = rcu_dereference_check(vq->private_data, 1); |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 419 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 420 | if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue)) |
| 421 | return; |
| 422 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 423 | mutex_lock(&vq->mutex); |
| 424 | vhost_disable_notify(vq); |
| 425 | vhost_hlen = vq->vhost_hlen; |
| 426 | sock_hlen = vq->sock_hlen; |
| 427 | |
| 428 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? |
| 429 | vq->log : NULL; |
| 430 | |
| 431 | while ((sock_len = peek_head_len(sock->sk))) { |
| 432 | sock_len += sock_hlen; |
| 433 | vhost_len = sock_len + vhost_hlen; |
| 434 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, |
| 435 | &in, vq_log, &log); |
| 436 | /* On error, stop handling until the next kick. */ |
| 437 | if (unlikely(headcount < 0)) |
| 438 | break; |
| 439 | /* OK, now we need to know about added descriptors. */ |
| 440 | if (!headcount) { |
| 441 | if (unlikely(vhost_enable_notify(vq))) { |
| 442 | /* They have slipped one in as we were |
| 443 | * doing that: check again. */ |
| 444 | vhost_disable_notify(vq); |
| 445 | continue; |
| 446 | } |
| 447 | /* Nothing new? Wait for eventfd to tell us |
| 448 | * they refilled. */ |
| 449 | break; |
| 450 | } |
| 451 | /* We don't need to be notified again. */ |
| 452 | if (unlikely((vhost_hlen))) |
| 453 | /* Skip header. TODO: support TSO. */ |
| 454 | move_iovec_hdr(vq->iov, vq->hdr, vhost_hlen, in); |
| 455 | else |
| 456 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: |
Jason Wang | a290aec | 2010-11-29 13:48:40 +0800 | [diff] [blame] | 457 | * needed because recvmsg can modify msg_iov. */ |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 458 | copy_iovec_hdr(vq->iov, vq->hdr, sock_hlen, in); |
| 459 | msg.msg_iovlen = in; |
| 460 | err = sock->ops->recvmsg(NULL, sock, &msg, |
| 461 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
| 462 | /* Userspace might have consumed the packet meanwhile: |
| 463 | * it's not supposed to do this usually, but might be hard |
| 464 | * to prevent. Discard data we got (if any) and keep going. */ |
| 465 | if (unlikely(err != sock_len)) { |
| 466 | pr_debug("Discarded rx packet: " |
| 467 | " len %d, expected %zd\n", err, sock_len); |
| 468 | vhost_discard_vq_desc(vq, headcount); |
| 469 | continue; |
| 470 | } |
| 471 | if (unlikely(vhost_hlen) && |
| 472 | memcpy_toiovecend(vq->hdr, (unsigned char *)&hdr, 0, |
| 473 | vhost_hlen)) { |
| 474 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", |
| 475 | vq->iov->iov_base); |
| 476 | break; |
| 477 | } |
| 478 | /* TODO: Should check and handle checksum. */ |
| 479 | if (vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF) && |
| 480 | memcpy_toiovecend(vq->hdr, (unsigned char *)&headcount, |
| 481 | offsetof(typeof(hdr), num_buffers), |
| 482 | sizeof hdr.num_buffers)) { |
| 483 | vq_err(vq, "Failed num_buffers write"); |
| 484 | vhost_discard_vq_desc(vq, headcount); |
| 485 | break; |
| 486 | } |
| 487 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, |
| 488 | headcount); |
| 489 | if (unlikely(vq_log)) |
| 490 | vhost_log_write(vq, vq_log, log, vhost_len); |
| 491 | total_len += vhost_len; |
| 492 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
| 493 | vhost_poll_queue(&vq->poll); |
| 494 | break; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | mutex_unlock(&vq->mutex); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | static void handle_rx(struct vhost_net *net) |
| 502 | { |
| 503 | if (vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF)) |
| 504 | handle_rx_mergeable(net); |
| 505 | else |
| 506 | handle_rx_big(net); |
| 507 | } |
| 508 | |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 509 | static void handle_tx_kick(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 510 | { |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 511 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 512 | poll.work); |
| 513 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); |
| 514 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 515 | handle_tx(net); |
| 516 | } |
| 517 | |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 518 | static void handle_rx_kick(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 519 | { |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 520 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 521 | poll.work); |
| 522 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); |
| 523 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 524 | handle_rx(net); |
| 525 | } |
| 526 | |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 527 | static void handle_tx_net(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 528 | { |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 529 | struct vhost_net *net = container_of(work, struct vhost_net, |
| 530 | poll[VHOST_NET_VQ_TX].work); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 531 | handle_tx(net); |
| 532 | } |
| 533 | |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 534 | static void handle_rx_net(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 535 | { |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 536 | struct vhost_net *net = container_of(work, struct vhost_net, |
| 537 | poll[VHOST_NET_VQ_RX].work); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 538 | handle_rx(net); |
| 539 | } |
| 540 | |
| 541 | static int vhost_net_open(struct inode *inode, struct file *f) |
| 542 | { |
| 543 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 544 | struct vhost_dev *dev; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 545 | int r; |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 546 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 547 | if (!n) |
| 548 | return -ENOMEM; |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 549 | |
| 550 | dev = &n->dev; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 551 | n->vqs[VHOST_NET_VQ_TX].handle_kick = handle_tx_kick; |
| 552 | n->vqs[VHOST_NET_VQ_RX].handle_kick = handle_rx_kick; |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 553 | r = vhost_dev_init(dev, n->vqs, VHOST_NET_VQ_MAX); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 554 | if (r < 0) { |
| 555 | kfree(n); |
| 556 | return r; |
| 557 | } |
| 558 | |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 559 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
| 560 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 561 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; |
| 562 | |
| 563 | f->private_data = n; |
| 564 | |
| 565 | return 0; |
| 566 | } |
| 567 | |
| 568 | static void vhost_net_disable_vq(struct vhost_net *n, |
| 569 | struct vhost_virtqueue *vq) |
| 570 | { |
| 571 | if (!vq->private_data) |
| 572 | return; |
| 573 | if (vq == n->vqs + VHOST_NET_VQ_TX) { |
| 574 | tx_poll_stop(n); |
| 575 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; |
| 576 | } else |
| 577 | vhost_poll_stop(n->poll + VHOST_NET_VQ_RX); |
| 578 | } |
| 579 | |
| 580 | static void vhost_net_enable_vq(struct vhost_net *n, |
| 581 | struct vhost_virtqueue *vq) |
| 582 | { |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 583 | struct socket *sock; |
| 584 | |
| 585 | sock = rcu_dereference_protected(vq->private_data, |
| 586 | lockdep_is_held(&vq->mutex)); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 587 | if (!sock) |
| 588 | return; |
| 589 | if (vq == n->vqs + VHOST_NET_VQ_TX) { |
| 590 | n->tx_poll_state = VHOST_NET_POLL_STOPPED; |
| 591 | tx_poll_start(n, sock); |
| 592 | } else |
| 593 | vhost_poll_start(n->poll + VHOST_NET_VQ_RX, sock->file); |
| 594 | } |
| 595 | |
| 596 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
| 597 | struct vhost_virtqueue *vq) |
| 598 | { |
| 599 | struct socket *sock; |
| 600 | |
| 601 | mutex_lock(&vq->mutex); |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 602 | sock = rcu_dereference_protected(vq->private_data, |
| 603 | lockdep_is_held(&vq->mutex)); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 604 | vhost_net_disable_vq(n, vq); |
| 605 | rcu_assign_pointer(vq->private_data, NULL); |
| 606 | mutex_unlock(&vq->mutex); |
| 607 | return sock; |
| 608 | } |
| 609 | |
| 610 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, |
| 611 | struct socket **rx_sock) |
| 612 | { |
| 613 | *tx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_TX); |
| 614 | *rx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_RX); |
| 615 | } |
| 616 | |
| 617 | static void vhost_net_flush_vq(struct vhost_net *n, int index) |
| 618 | { |
| 619 | vhost_poll_flush(n->poll + index); |
| 620 | vhost_poll_flush(&n->dev.vqs[index].poll); |
| 621 | } |
| 622 | |
| 623 | static void vhost_net_flush(struct vhost_net *n) |
| 624 | { |
| 625 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); |
| 626 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); |
| 627 | } |
| 628 | |
| 629 | static int vhost_net_release(struct inode *inode, struct file *f) |
| 630 | { |
| 631 | struct vhost_net *n = f->private_data; |
| 632 | struct socket *tx_sock; |
| 633 | struct socket *rx_sock; |
| 634 | |
| 635 | vhost_net_stop(n, &tx_sock, &rx_sock); |
| 636 | vhost_net_flush(n); |
| 637 | vhost_dev_cleanup(&n->dev); |
| 638 | if (tx_sock) |
| 639 | fput(tx_sock->file); |
| 640 | if (rx_sock) |
| 641 | fput(rx_sock->file); |
| 642 | /* We do an extra flush before freeing memory, |
| 643 | * since jobs can re-queue themselves. */ |
| 644 | vhost_net_flush(n); |
| 645 | kfree(n); |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static struct socket *get_raw_socket(int fd) |
| 650 | { |
| 651 | struct { |
| 652 | struct sockaddr_ll sa; |
| 653 | char buf[MAX_ADDR_LEN]; |
| 654 | } uaddr; |
| 655 | int uaddr_len = sizeof uaddr, r; |
| 656 | struct socket *sock = sockfd_lookup(fd, &r); |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 657 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 658 | if (!sock) |
| 659 | return ERR_PTR(-ENOTSOCK); |
| 660 | |
| 661 | /* Parameter checking */ |
| 662 | if (sock->sk->sk_type != SOCK_RAW) { |
| 663 | r = -ESOCKTNOSUPPORT; |
| 664 | goto err; |
| 665 | } |
| 666 | |
| 667 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, |
| 668 | &uaddr_len, 0); |
| 669 | if (r) |
| 670 | goto err; |
| 671 | |
| 672 | if (uaddr.sa.sll_family != AF_PACKET) { |
| 673 | r = -EPFNOSUPPORT; |
| 674 | goto err; |
| 675 | } |
| 676 | return sock; |
| 677 | err: |
| 678 | fput(sock->file); |
| 679 | return ERR_PTR(r); |
| 680 | } |
| 681 | |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 682 | static struct socket *get_tap_socket(int fd) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 683 | { |
| 684 | struct file *file = fget(fd); |
| 685 | struct socket *sock; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 686 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 687 | if (!file) |
| 688 | return ERR_PTR(-EBADF); |
| 689 | sock = tun_get_socket(file); |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 690 | if (!IS_ERR(sock)) |
| 691 | return sock; |
| 692 | sock = macvtap_get_socket(file); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 693 | if (IS_ERR(sock)) |
| 694 | fput(file); |
| 695 | return sock; |
| 696 | } |
| 697 | |
| 698 | static struct socket *get_socket(int fd) |
| 699 | { |
| 700 | struct socket *sock; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 701 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 702 | /* special case to disable backend */ |
| 703 | if (fd == -1) |
| 704 | return NULL; |
| 705 | sock = get_raw_socket(fd); |
| 706 | if (!IS_ERR(sock)) |
| 707 | return sock; |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 708 | sock = get_tap_socket(fd); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 709 | if (!IS_ERR(sock)) |
| 710 | return sock; |
| 711 | return ERR_PTR(-ENOTSOCK); |
| 712 | } |
| 713 | |
| 714 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) |
| 715 | { |
| 716 | struct socket *sock, *oldsock; |
| 717 | struct vhost_virtqueue *vq; |
| 718 | int r; |
| 719 | |
| 720 | mutex_lock(&n->dev.mutex); |
| 721 | r = vhost_dev_check_owner(&n->dev); |
| 722 | if (r) |
| 723 | goto err; |
| 724 | |
| 725 | if (index >= VHOST_NET_VQ_MAX) { |
| 726 | r = -ENOBUFS; |
| 727 | goto err; |
| 728 | } |
| 729 | vq = n->vqs + index; |
| 730 | mutex_lock(&vq->mutex); |
| 731 | |
| 732 | /* Verify that ring has been setup correctly. */ |
| 733 | if (!vhost_vq_access_ok(vq)) { |
| 734 | r = -EFAULT; |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 735 | goto err_vq; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 736 | } |
| 737 | sock = get_socket(fd); |
| 738 | if (IS_ERR(sock)) { |
| 739 | r = PTR_ERR(sock); |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 740 | goto err_vq; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | /* start polling new socket */ |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 744 | oldsock = rcu_dereference_protected(vq->private_data, |
| 745 | lockdep_is_held(&vq->mutex)); |
David S. Miller | 11fe883 | 2010-07-20 18:25:24 -0700 | [diff] [blame] | 746 | if (sock != oldsock) { |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 747 | vhost_net_disable_vq(n, vq); |
| 748 | rcu_assign_pointer(vq->private_data, sock); |
| 749 | vhost_net_enable_vq(n, vq); |
Jeff Dike | dd1f407 | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 750 | } |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 751 | |
Michael S. Tsirkin | 1680e90 | 2010-07-15 15:19:12 +0300 | [diff] [blame] | 752 | mutex_unlock(&vq->mutex); |
| 753 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 754 | if (oldsock) { |
| 755 | vhost_net_flush_vq(n, index); |
| 756 | fput(oldsock->file); |
| 757 | } |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 758 | |
Michael S. Tsirkin | 1680e90 | 2010-07-15 15:19:12 +0300 | [diff] [blame] | 759 | mutex_unlock(&n->dev.mutex); |
| 760 | return 0; |
| 761 | |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 762 | err_vq: |
| 763 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 764 | err: |
| 765 | mutex_unlock(&n->dev.mutex); |
| 766 | return r; |
| 767 | } |
| 768 | |
| 769 | static long vhost_net_reset_owner(struct vhost_net *n) |
| 770 | { |
| 771 | struct socket *tx_sock = NULL; |
| 772 | struct socket *rx_sock = NULL; |
| 773 | long err; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 774 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 775 | mutex_lock(&n->dev.mutex); |
| 776 | err = vhost_dev_check_owner(&n->dev); |
| 777 | if (err) |
| 778 | goto done; |
| 779 | vhost_net_stop(n, &tx_sock, &rx_sock); |
| 780 | vhost_net_flush(n); |
| 781 | err = vhost_dev_reset_owner(&n->dev); |
| 782 | done: |
| 783 | mutex_unlock(&n->dev.mutex); |
| 784 | if (tx_sock) |
| 785 | fput(tx_sock->file); |
| 786 | if (rx_sock) |
| 787 | fput(rx_sock->file); |
| 788 | return err; |
| 789 | } |
| 790 | |
| 791 | static int vhost_net_set_features(struct vhost_net *n, u64 features) |
| 792 | { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 793 | size_t vhost_hlen, sock_hlen, hdr_len; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 794 | int i; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 795 | |
| 796 | hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? |
| 797 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
| 798 | sizeof(struct virtio_net_hdr); |
| 799 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { |
| 800 | /* vhost provides vnet_hdr */ |
| 801 | vhost_hlen = hdr_len; |
| 802 | sock_hlen = 0; |
| 803 | } else { |
| 804 | /* socket provides vnet_hdr */ |
| 805 | vhost_hlen = 0; |
| 806 | sock_hlen = hdr_len; |
| 807 | } |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 808 | mutex_lock(&n->dev.mutex); |
| 809 | if ((features & (1 << VHOST_F_LOG_ALL)) && |
| 810 | !vhost_log_access_ok(&n->dev)) { |
| 811 | mutex_unlock(&n->dev.mutex); |
| 812 | return -EFAULT; |
| 813 | } |
| 814 | n->dev.acked_features = features; |
| 815 | smp_wmb(); |
| 816 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
| 817 | mutex_lock(&n->vqs[i].mutex); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 818 | n->vqs[i].vhost_hlen = vhost_hlen; |
| 819 | n->vqs[i].sock_hlen = sock_hlen; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 820 | mutex_unlock(&n->vqs[i].mutex); |
| 821 | } |
| 822 | vhost_net_flush(n); |
| 823 | mutex_unlock(&n->dev.mutex); |
| 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
| 828 | unsigned long arg) |
| 829 | { |
| 830 | struct vhost_net *n = f->private_data; |
| 831 | void __user *argp = (void __user *)arg; |
| 832 | u64 __user *featurep = argp; |
| 833 | struct vhost_vring_file backend; |
| 834 | u64 features; |
| 835 | int r; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame^] | 836 | |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 837 | switch (ioctl) { |
| 838 | case VHOST_NET_SET_BACKEND: |
Takuya Yoshikawa | d3553a5 | 2010-05-27 19:01:58 +0900 | [diff] [blame] | 839 | if (copy_from_user(&backend, argp, sizeof backend)) |
| 840 | return -EFAULT; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 841 | return vhost_net_set_backend(n, backend.index, backend.fd); |
| 842 | case VHOST_GET_FEATURES: |
| 843 | features = VHOST_FEATURES; |
Takuya Yoshikawa | d3553a5 | 2010-05-27 19:01:58 +0900 | [diff] [blame] | 844 | if (copy_to_user(featurep, &features, sizeof features)) |
| 845 | return -EFAULT; |
| 846 | return 0; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 847 | case VHOST_SET_FEATURES: |
Takuya Yoshikawa | d3553a5 | 2010-05-27 19:01:58 +0900 | [diff] [blame] | 848 | if (copy_from_user(&features, featurep, sizeof features)) |
| 849 | return -EFAULT; |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 850 | if (features & ~VHOST_FEATURES) |
| 851 | return -EOPNOTSUPP; |
| 852 | return vhost_net_set_features(n, features); |
| 853 | case VHOST_RESET_OWNER: |
| 854 | return vhost_net_reset_owner(n); |
| 855 | default: |
| 856 | mutex_lock(&n->dev.mutex); |
| 857 | r = vhost_dev_ioctl(&n->dev, ioctl, arg); |
| 858 | vhost_net_flush(n); |
| 859 | mutex_unlock(&n->dev.mutex); |
| 860 | return r; |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | #ifdef CONFIG_COMPAT |
| 865 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, |
| 866 | unsigned long arg) |
| 867 | { |
| 868 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); |
| 869 | } |
| 870 | #endif |
| 871 | |
Tobias Klauser | 373a83a | 2010-05-17 15:12:49 +0200 | [diff] [blame] | 872 | static const struct file_operations vhost_net_fops = { |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 873 | .owner = THIS_MODULE, |
| 874 | .release = vhost_net_release, |
| 875 | .unlocked_ioctl = vhost_net_ioctl, |
| 876 | #ifdef CONFIG_COMPAT |
| 877 | .compat_ioctl = vhost_net_compat_ioctl, |
| 878 | #endif |
| 879 | .open = vhost_net_open, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 880 | .llseek = noop_llseek, |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 881 | }; |
| 882 | |
| 883 | static struct miscdevice vhost_net_misc = { |
Alan Cox | 79907d8 | 2010-06-09 09:39:49 +0100 | [diff] [blame] | 884 | MISC_DYNAMIC_MINOR, |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 885 | "vhost-net", |
| 886 | &vhost_net_fops, |
| 887 | }; |
| 888 | |
Christoph Hellwig | a8d3782 | 2010-04-13 14:11:25 -0400 | [diff] [blame] | 889 | static int vhost_net_init(void) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 890 | { |
Tejun Heo | c23f3445 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 891 | return misc_register(&vhost_net_misc); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 892 | } |
| 893 | module_init(vhost_net_init); |
| 894 | |
Christoph Hellwig | a8d3782 | 2010-04-13 14:11:25 -0400 | [diff] [blame] | 895 | static void vhost_net_exit(void) |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 896 | { |
| 897 | misc_deregister(&vhost_net_misc); |
Michael S. Tsirkin | 3a4d5c94e | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 898 | } |
| 899 | module_exit(vhost_net_exit); |
| 900 | |
| 901 | MODULE_VERSION("0.0.1"); |
| 902 | MODULE_LICENSE("GPL v2"); |
| 903 | MODULE_AUTHOR("Michael S. Tsirkin"); |
| 904 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); |