Michael S. Tsirkin | 3a4d5c9 | 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 | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 13 | #include <linux/miscdevice.h> |
| 14 | #include <linux/module.h> |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 15 | #include <linux/moduleparam.h> |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 16 | #include <linux/mutex.h> |
| 17 | #include <linux/workqueue.h> |
| 18 | #include <linux/rcupdate.h> |
| 19 | #include <linux/file.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 21 | |
| 22 | #include <linux/net.h> |
| 23 | #include <linux/if_packet.h> |
| 24 | #include <linux/if_arp.h> |
| 25 | #include <linux/if_tun.h> |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 26 | #include <linux/if_macvlan.h> |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 27 | |
| 28 | #include <net/sock.h> |
| 29 | |
| 30 | #include "vhost.h" |
| 31 | |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 32 | static int experimental_zcopytx; |
| 33 | module_param(experimental_zcopytx, int, 0444); |
| 34 | MODULE_PARM_DESC(experimental_zcopytx, "Enable Experimental Zero Copy TX"); |
| 35 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 36 | /* Max number of bytes transferred before requeueing the job. |
| 37 | * Using this limit prevents one virtqueue from starving others. */ |
| 38 | #define VHOST_NET_WEIGHT 0x80000 |
| 39 | |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 40 | /* MAX number of TX used buffers for outstanding zerocopy */ |
| 41 | #define VHOST_MAX_PEND 128 |
| 42 | #define VHOST_GOODCOPY_LEN 256 |
| 43 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 44 | enum { |
| 45 | VHOST_NET_VQ_RX = 0, |
| 46 | VHOST_NET_VQ_TX = 1, |
| 47 | VHOST_NET_VQ_MAX = 2, |
| 48 | }; |
| 49 | |
| 50 | enum vhost_net_poll_state { |
| 51 | VHOST_NET_POLL_DISABLED = 0, |
| 52 | VHOST_NET_POLL_STARTED = 1, |
| 53 | VHOST_NET_POLL_STOPPED = 2, |
| 54 | }; |
| 55 | |
| 56 | struct vhost_net { |
| 57 | struct vhost_dev dev; |
| 58 | struct vhost_virtqueue vqs[VHOST_NET_VQ_MAX]; |
| 59 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
| 60 | /* Tells us whether we are polling a socket for TX. |
| 61 | * We only do this when socket buffer fills up. |
| 62 | * Protected by tx vq lock. */ |
| 63 | enum vhost_net_poll_state tx_poll_state; |
| 64 | }; |
| 65 | |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 66 | static bool vhost_sock_zcopy(struct socket *sock) |
| 67 | { |
| 68 | return unlikely(experimental_zcopytx) && |
| 69 | sock_flag(sock->sk, SOCK_ZEROCOPY); |
| 70 | } |
| 71 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 72 | /* Pop first len bytes from iovec. Return number of segments used. */ |
| 73 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, |
| 74 | size_t len, int iov_count) |
| 75 | { |
| 76 | int seg = 0; |
| 77 | size_t size; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 78 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 79 | while (len && seg < iov_count) { |
| 80 | size = min(from->iov_len, len); |
| 81 | to->iov_base = from->iov_base; |
| 82 | to->iov_len = size; |
| 83 | from->iov_len -= size; |
| 84 | from->iov_base += size; |
| 85 | len -= size; |
| 86 | ++from; |
| 87 | ++to; |
| 88 | ++seg; |
| 89 | } |
| 90 | return seg; |
| 91 | } |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 92 | /* Copy iovec entries for len bytes from iovec. */ |
| 93 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, |
| 94 | size_t len, int iovcount) |
| 95 | { |
| 96 | int seg = 0; |
| 97 | size_t size; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 98 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 99 | while (len && seg < iovcount) { |
| 100 | size = min(from->iov_len, len); |
| 101 | to->iov_base = from->iov_base; |
| 102 | to->iov_len = size; |
| 103 | len -= size; |
| 104 | ++from; |
| 105 | ++to; |
| 106 | ++seg; |
| 107 | } |
| 108 | } |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 109 | |
| 110 | /* Caller must have TX VQ lock */ |
| 111 | static void tx_poll_stop(struct vhost_net *net) |
| 112 | { |
| 113 | if (likely(net->tx_poll_state != VHOST_NET_POLL_STARTED)) |
| 114 | return; |
| 115 | vhost_poll_stop(net->poll + VHOST_NET_VQ_TX); |
| 116 | net->tx_poll_state = VHOST_NET_POLL_STOPPED; |
| 117 | } |
| 118 | |
| 119 | /* Caller must have TX VQ lock */ |
| 120 | static void tx_poll_start(struct vhost_net *net, struct socket *sock) |
| 121 | { |
| 122 | if (unlikely(net->tx_poll_state != VHOST_NET_POLL_STOPPED)) |
| 123 | return; |
| 124 | vhost_poll_start(net->poll + VHOST_NET_VQ_TX, sock->file); |
| 125 | net->tx_poll_state = VHOST_NET_POLL_STARTED; |
| 126 | } |
| 127 | |
| 128 | /* Expects to be always run from workqueue - which acts as |
| 129 | * read-size critical section for our kind of RCU. */ |
| 130 | static void handle_tx(struct vhost_net *net) |
| 131 | { |
| 132 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX]; |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 133 | unsigned out, in, s; |
| 134 | int head; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 135 | struct msghdr msg = { |
| 136 | .msg_name = NULL, |
| 137 | .msg_namelen = 0, |
| 138 | .msg_control = NULL, |
| 139 | .msg_controllen = 0, |
| 140 | .msg_iov = vq->iov, |
| 141 | .msg_flags = MSG_DONTWAIT, |
| 142 | }; |
| 143 | size_t len, total_len = 0; |
| 144 | int err, wmem; |
| 145 | size_t hdr_size; |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 146 | struct socket *sock; |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 147 | struct vhost_ubuf_ref *uninitialized_var(ubufs); |
| 148 | bool zcopy; |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 149 | |
Michael S. Tsirkin | 5e18247 | 2011-01-18 13:04:43 +0200 | [diff] [blame] | 150 | /* TODO: check that we are running from vhost_worker? */ |
Michael S. Tsirkin | 11cd1a8 | 2010-11-14 17:31:52 +0200 | [diff] [blame] | 151 | sock = rcu_dereference_check(vq->private_data, 1); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 152 | if (!sock) |
| 153 | return; |
| 154 | |
| 155 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); |
Sridhar Samudrala | 39286fa | 2010-02-28 19:39:16 +0200 | [diff] [blame] | 156 | if (wmem >= sock->sk->sk_sndbuf) { |
| 157 | mutex_lock(&vq->mutex); |
| 158 | tx_poll_start(net, sock); |
| 159 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 160 | return; |
Sridhar Samudrala | 39286fa | 2010-02-28 19:39:16 +0200 | [diff] [blame] | 161 | } |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 162 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 163 | mutex_lock(&vq->mutex); |
Michael S. Tsirkin | 8ea8cf8 | 2011-05-20 02:10:54 +0300 | [diff] [blame] | 164 | vhost_disable_notify(&net->dev, vq); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 165 | |
Michael S. Tsirkin | 0e25557 | 2010-03-08 23:24:22 +0200 | [diff] [blame] | 166 | if (wmem < sock->sk->sk_sndbuf / 2) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 167 | tx_poll_stop(net); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 168 | hdr_size = vq->vhost_hlen; |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 169 | zcopy = vhost_sock_zcopy(sock); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 170 | |
| 171 | for (;;) { |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 172 | /* Release DMAs done buffers first */ |
| 173 | if (zcopy) |
| 174 | vhost_zerocopy_signal_used(vq); |
| 175 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 176 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
| 177 | ARRAY_SIZE(vq->iov), |
| 178 | &out, &in, |
| 179 | NULL, NULL); |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 180 | /* On error, stop handling until the next kick. */ |
Michael S. Tsirkin | 7b3384f | 2010-07-01 18:40:12 +0300 | [diff] [blame] | 181 | if (unlikely(head < 0)) |
Michael S. Tsirkin | d5675bd | 2010-06-24 16:59:59 +0300 | [diff] [blame] | 182 | break; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 183 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
| 184 | if (head == vq->num) { |
Shirley Ma | 9e38082 | 2011-07-20 10:23:12 -0700 | [diff] [blame] | 185 | int num_pends; |
| 186 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 187 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); |
| 188 | if (wmem >= sock->sk->sk_sndbuf * 3 / 4) { |
| 189 | tx_poll_start(net, sock); |
| 190 | set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
| 191 | break; |
| 192 | } |
Shirley Ma | 9e38082 | 2011-07-20 10:23:12 -0700 | [diff] [blame] | 193 | /* If more outstanding DMAs, queue the work. |
| 194 | * Handle upend_idx wrap around |
| 195 | */ |
| 196 | num_pends = likely(vq->upend_idx >= vq->done_idx) ? |
| 197 | (vq->upend_idx - vq->done_idx) : |
| 198 | (vq->upend_idx + UIO_MAXIOV - vq->done_idx); |
| 199 | if (unlikely(num_pends > VHOST_MAX_PEND)) { |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 200 | tx_poll_start(net, sock); |
| 201 | set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
| 202 | break; |
| 203 | } |
Michael S. Tsirkin | 8ea8cf8 | 2011-05-20 02:10:54 +0300 | [diff] [blame] | 204 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
| 205 | vhost_disable_notify(&net->dev, vq); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 206 | continue; |
| 207 | } |
| 208 | break; |
| 209 | } |
| 210 | if (in) { |
| 211 | vq_err(vq, "Unexpected descriptor format for TX: " |
| 212 | "out %d, int %d\n", out, in); |
| 213 | break; |
| 214 | } |
| 215 | /* Skip header. TODO: support TSO. */ |
| 216 | s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out); |
| 217 | msg.msg_iovlen = out; |
| 218 | len = iov_length(vq->iov, out); |
| 219 | /* Sanity check */ |
| 220 | if (!len) { |
| 221 | vq_err(vq, "Unexpected header len for TX: " |
| 222 | "%zd expected %zd\n", |
| 223 | iov_length(vq->hdr, s), hdr_size); |
| 224 | break; |
| 225 | } |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 226 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
| 227 | if (zcopy) { |
| 228 | vq->heads[vq->upend_idx].id = head; |
| 229 | if (len < VHOST_GOODCOPY_LEN) { |
| 230 | /* copy don't need to wait for DMA done */ |
| 231 | vq->heads[vq->upend_idx].len = |
| 232 | VHOST_DMA_DONE_LEN; |
| 233 | msg.msg_control = NULL; |
| 234 | msg.msg_controllen = 0; |
| 235 | ubufs = NULL; |
| 236 | } else { |
| 237 | struct ubuf_info *ubuf = &vq->ubuf_info[head]; |
| 238 | |
| 239 | vq->heads[vq->upend_idx].len = len; |
| 240 | ubuf->callback = vhost_zerocopy_callback; |
| 241 | ubuf->arg = vq->ubufs; |
| 242 | ubuf->desc = vq->upend_idx; |
| 243 | msg.msg_control = ubuf; |
| 244 | msg.msg_controllen = sizeof(ubuf); |
| 245 | ubufs = vq->ubufs; |
| 246 | kref_get(&ubufs->kref); |
| 247 | } |
| 248 | vq->upend_idx = (vq->upend_idx + 1) % UIO_MAXIOV; |
| 249 | } |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 250 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
| 251 | err = sock->ops->sendmsg(NULL, sock, &msg, len); |
| 252 | if (unlikely(err < 0)) { |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 253 | if (zcopy) { |
| 254 | if (ubufs) |
| 255 | vhost_ubuf_put(ubufs); |
| 256 | vq->upend_idx = ((unsigned)vq->upend_idx - 1) % |
| 257 | UIO_MAXIOV; |
| 258 | } |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 259 | vhost_discard_vq_desc(vq, 1); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 260 | tx_poll_start(net, sock); |
| 261 | break; |
| 262 | } |
| 263 | if (err != len) |
Michael S. Tsirkin | 95c0ec6 | 2010-06-24 17:10:25 +0300 | [diff] [blame] | 264 | pr_debug("Truncated TX packet: " |
| 265 | " len %d != %zd\n", err, len); |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 266 | if (!zcopy) |
| 267 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 268 | total_len += len; |
| 269 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
| 270 | vhost_poll_queue(&vq->poll); |
| 271 | break; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 276 | } |
| 277 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 278 | static int peek_head_len(struct sock *sk) |
| 279 | { |
| 280 | struct sk_buff *head; |
| 281 | int len = 0; |
Jason Wang | 783e398 | 2011-01-17 16:11:17 +0800 | [diff] [blame] | 282 | unsigned long flags; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 283 | |
Jason Wang | 783e398 | 2011-01-17 16:11:17 +0800 | [diff] [blame] | 284 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 285 | head = skb_peek(&sk->sk_receive_queue); |
Jason Wang | 783e398 | 2011-01-17 16:11:17 +0800 | [diff] [blame] | 286 | if (likely(head)) |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 287 | len = head->len; |
Jason Wang | 783e398 | 2011-01-17 16:11:17 +0800 | [diff] [blame] | 288 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 289 | return len; |
| 290 | } |
| 291 | |
| 292 | /* This is a multi-buffer version of vhost_get_desc, that works if |
| 293 | * vq has read descriptors only. |
| 294 | * @vq - the relevant virtqueue |
| 295 | * @datalen - data length we'll be reading |
| 296 | * @iovcount - returned count of io vectors we fill |
| 297 | * @log - vhost log |
| 298 | * @log_num - log offset |
Jason Wang | 9424936 | 2011-01-17 16:11:08 +0800 | [diff] [blame] | 299 | * @quota - headcount quota, 1 for big buffer |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 300 | * returns number of buffer heads allocated, negative on error |
| 301 | */ |
| 302 | static int get_rx_bufs(struct vhost_virtqueue *vq, |
| 303 | struct vring_used_elem *heads, |
| 304 | int datalen, |
| 305 | unsigned *iovcount, |
| 306 | struct vhost_log *log, |
Jason Wang | 9424936 | 2011-01-17 16:11:08 +0800 | [diff] [blame] | 307 | unsigned *log_num, |
| 308 | unsigned int quota) |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 309 | { |
| 310 | unsigned int out, in; |
| 311 | int seg = 0; |
| 312 | int headcount = 0; |
| 313 | unsigned d; |
| 314 | int r, nlogs = 0; |
| 315 | |
Jason Wang | 9424936 | 2011-01-17 16:11:08 +0800 | [diff] [blame] | 316 | while (datalen > 0 && headcount < quota) { |
Jason Wang | e0e9b40 | 2010-09-14 23:53:05 +0800 | [diff] [blame] | 317 | if (unlikely(seg >= UIO_MAXIOV)) { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 318 | r = -ENOBUFS; |
| 319 | goto err; |
| 320 | } |
| 321 | d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg, |
| 322 | ARRAY_SIZE(vq->iov) - seg, &out, |
| 323 | &in, log, log_num); |
| 324 | if (d == vq->num) { |
| 325 | r = 0; |
| 326 | goto err; |
| 327 | } |
| 328 | if (unlikely(out || in <= 0)) { |
| 329 | vq_err(vq, "unexpected descriptor format for RX: " |
| 330 | "out %d, in %d\n", out, in); |
| 331 | r = -EINVAL; |
| 332 | goto err; |
| 333 | } |
| 334 | if (unlikely(log)) { |
| 335 | nlogs += *log_num; |
| 336 | log += *log_num; |
| 337 | } |
| 338 | heads[headcount].id = d; |
| 339 | heads[headcount].len = iov_length(vq->iov + seg, in); |
| 340 | datalen -= heads[headcount].len; |
| 341 | ++headcount; |
| 342 | seg += in; |
| 343 | } |
| 344 | heads[headcount - 1].len += datalen; |
| 345 | *iovcount = seg; |
| 346 | if (unlikely(log)) |
| 347 | *log_num = nlogs; |
| 348 | return headcount; |
| 349 | err: |
| 350 | vhost_discard_vq_desc(vq, headcount); |
| 351 | return r; |
| 352 | } |
| 353 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 354 | /* Expects to be always run from workqueue - which acts as |
| 355 | * read-size critical section for our kind of RCU. */ |
Jason Wang | 9424936 | 2011-01-17 16:11:08 +0800 | [diff] [blame] | 356 | static void handle_rx(struct vhost_net *net) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 357 | { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 358 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX]; |
| 359 | unsigned uninitialized_var(in), log; |
| 360 | struct vhost_log *vq_log; |
| 361 | struct msghdr msg = { |
| 362 | .msg_name = NULL, |
| 363 | .msg_namelen = 0, |
| 364 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ |
| 365 | .msg_controllen = 0, |
| 366 | .msg_iov = vq->iov, |
| 367 | .msg_flags = MSG_DONTWAIT, |
| 368 | }; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 369 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
| 370 | .hdr.flags = 0, |
| 371 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE |
| 372 | }; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 373 | size_t total_len = 0; |
Jason Wang | cfbdab9 | 2011-01-17 16:10:59 +0800 | [diff] [blame] | 374 | int err, headcount, mergeable; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 375 | size_t vhost_hlen, sock_hlen; |
| 376 | size_t vhost_len, sock_len; |
Michael S. Tsirkin | 5e18247 | 2011-01-18 13:04:43 +0200 | [diff] [blame] | 377 | /* TODO: check that we are running from vhost_worker? */ |
| 378 | struct socket *sock = rcu_dereference_check(vq->private_data, 1); |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 379 | |
Michael S. Tsirkin | de4d768 | 2011-03-13 23:00:52 +0200 | [diff] [blame] | 380 | if (!sock) |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 381 | return; |
| 382 | |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 383 | mutex_lock(&vq->mutex); |
Michael S. Tsirkin | 8ea8cf8 | 2011-05-20 02:10:54 +0300 | [diff] [blame] | 384 | vhost_disable_notify(&net->dev, vq); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 385 | vhost_hlen = vq->vhost_hlen; |
| 386 | sock_hlen = vq->sock_hlen; |
| 387 | |
| 388 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? |
| 389 | vq->log : NULL; |
Jason Wang | cfbdab9 | 2011-01-17 16:10:59 +0800 | [diff] [blame] | 390 | mergeable = vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 391 | |
| 392 | while ((sock_len = peek_head_len(sock->sk))) { |
| 393 | sock_len += sock_hlen; |
| 394 | vhost_len = sock_len + vhost_hlen; |
| 395 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, |
Jason Wang | 9424936 | 2011-01-17 16:11:08 +0800 | [diff] [blame] | 396 | &in, vq_log, &log, |
| 397 | likely(mergeable) ? UIO_MAXIOV : 1); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 398 | /* On error, stop handling until the next kick. */ |
| 399 | if (unlikely(headcount < 0)) |
| 400 | break; |
| 401 | /* OK, now we need to know about added descriptors. */ |
| 402 | if (!headcount) { |
Michael S. Tsirkin | 8ea8cf8 | 2011-05-20 02:10:54 +0300 | [diff] [blame] | 403 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 404 | /* They have slipped one in as we were |
| 405 | * doing that: check again. */ |
Michael S. Tsirkin | 8ea8cf8 | 2011-05-20 02:10:54 +0300 | [diff] [blame] | 406 | vhost_disable_notify(&net->dev, vq); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 407 | continue; |
| 408 | } |
| 409 | /* Nothing new? Wait for eventfd to tell us |
| 410 | * they refilled. */ |
| 411 | break; |
| 412 | } |
| 413 | /* We don't need to be notified again. */ |
| 414 | if (unlikely((vhost_hlen))) |
| 415 | /* Skip header. TODO: support TSO. */ |
| 416 | move_iovec_hdr(vq->iov, vq->hdr, vhost_hlen, in); |
| 417 | else |
| 418 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: |
Jason Wang | a290aec | 2010-11-29 13:48:40 +0800 | [diff] [blame] | 419 | * needed because recvmsg can modify msg_iov. */ |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 420 | copy_iovec_hdr(vq->iov, vq->hdr, sock_hlen, in); |
| 421 | msg.msg_iovlen = in; |
| 422 | err = sock->ops->recvmsg(NULL, sock, &msg, |
| 423 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
| 424 | /* Userspace might have consumed the packet meanwhile: |
| 425 | * it's not supposed to do this usually, but might be hard |
| 426 | * to prevent. Discard data we got (if any) and keep going. */ |
| 427 | if (unlikely(err != sock_len)) { |
| 428 | pr_debug("Discarded rx packet: " |
| 429 | " len %d, expected %zd\n", err, sock_len); |
| 430 | vhost_discard_vq_desc(vq, headcount); |
| 431 | continue; |
| 432 | } |
| 433 | if (unlikely(vhost_hlen) && |
| 434 | memcpy_toiovecend(vq->hdr, (unsigned char *)&hdr, 0, |
| 435 | vhost_hlen)) { |
| 436 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", |
| 437 | vq->iov->iov_base); |
| 438 | break; |
| 439 | } |
| 440 | /* TODO: Should check and handle checksum. */ |
Jason Wang | cfbdab9 | 2011-01-17 16:10:59 +0800 | [diff] [blame] | 441 | if (likely(mergeable) && |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 442 | memcpy_toiovecend(vq->hdr, (unsigned char *)&headcount, |
| 443 | offsetof(typeof(hdr), num_buffers), |
| 444 | sizeof hdr.num_buffers)) { |
| 445 | vq_err(vq, "Failed num_buffers write"); |
| 446 | vhost_discard_vq_desc(vq, headcount); |
| 447 | break; |
| 448 | } |
| 449 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, |
| 450 | headcount); |
| 451 | if (unlikely(vq_log)) |
| 452 | vhost_log_write(vq, vq_log, log, vhost_len); |
| 453 | total_len += vhost_len; |
| 454 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
| 455 | vhost_poll_queue(&vq->poll); |
| 456 | break; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | mutex_unlock(&vq->mutex); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 461 | } |
| 462 | |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 463 | static void handle_tx_kick(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 464 | { |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 465 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 466 | poll.work); |
| 467 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); |
| 468 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 469 | handle_tx(net); |
| 470 | } |
| 471 | |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 472 | static void handle_rx_kick(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 473 | { |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 474 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 475 | poll.work); |
| 476 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); |
| 477 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 478 | handle_rx(net); |
| 479 | } |
| 480 | |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 481 | static void handle_tx_net(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 482 | { |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 483 | struct vhost_net *net = container_of(work, struct vhost_net, |
| 484 | poll[VHOST_NET_VQ_TX].work); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 485 | handle_tx(net); |
| 486 | } |
| 487 | |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 488 | static void handle_rx_net(struct vhost_work *work) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 489 | { |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 490 | struct vhost_net *net = container_of(work, struct vhost_net, |
| 491 | poll[VHOST_NET_VQ_RX].work); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 492 | handle_rx(net); |
| 493 | } |
| 494 | |
| 495 | static int vhost_net_open(struct inode *inode, struct file *f) |
| 496 | { |
| 497 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 498 | struct vhost_dev *dev; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 499 | int r; |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 500 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 501 | if (!n) |
| 502 | return -ENOMEM; |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 503 | |
| 504 | dev = &n->dev; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 505 | n->vqs[VHOST_NET_VQ_TX].handle_kick = handle_tx_kick; |
| 506 | n->vqs[VHOST_NET_VQ_RX].handle_kick = handle_rx_kick; |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 507 | r = vhost_dev_init(dev, n->vqs, VHOST_NET_VQ_MAX); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 508 | if (r < 0) { |
| 509 | kfree(n); |
| 510 | return r; |
| 511 | } |
| 512 | |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 513 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
| 514 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 515 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; |
| 516 | |
| 517 | f->private_data = n; |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static void vhost_net_disable_vq(struct vhost_net *n, |
| 523 | struct vhost_virtqueue *vq) |
| 524 | { |
| 525 | if (!vq->private_data) |
| 526 | return; |
| 527 | if (vq == n->vqs + VHOST_NET_VQ_TX) { |
| 528 | tx_poll_stop(n); |
| 529 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; |
| 530 | } else |
| 531 | vhost_poll_stop(n->poll + VHOST_NET_VQ_RX); |
| 532 | } |
| 533 | |
| 534 | static void vhost_net_enable_vq(struct vhost_net *n, |
| 535 | struct vhost_virtqueue *vq) |
| 536 | { |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 537 | struct socket *sock; |
| 538 | |
| 539 | sock = rcu_dereference_protected(vq->private_data, |
| 540 | lockdep_is_held(&vq->mutex)); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 541 | if (!sock) |
| 542 | return; |
| 543 | if (vq == n->vqs + VHOST_NET_VQ_TX) { |
| 544 | n->tx_poll_state = VHOST_NET_POLL_STOPPED; |
| 545 | tx_poll_start(n, sock); |
| 546 | } else |
| 547 | vhost_poll_start(n->poll + VHOST_NET_VQ_RX, sock->file); |
| 548 | } |
| 549 | |
| 550 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
| 551 | struct vhost_virtqueue *vq) |
| 552 | { |
| 553 | struct socket *sock; |
| 554 | |
| 555 | mutex_lock(&vq->mutex); |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 556 | sock = rcu_dereference_protected(vq->private_data, |
| 557 | lockdep_is_held(&vq->mutex)); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 558 | vhost_net_disable_vq(n, vq); |
| 559 | rcu_assign_pointer(vq->private_data, NULL); |
| 560 | mutex_unlock(&vq->mutex); |
| 561 | return sock; |
| 562 | } |
| 563 | |
| 564 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, |
| 565 | struct socket **rx_sock) |
| 566 | { |
| 567 | *tx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_TX); |
| 568 | *rx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_RX); |
| 569 | } |
| 570 | |
| 571 | static void vhost_net_flush_vq(struct vhost_net *n, int index) |
| 572 | { |
| 573 | vhost_poll_flush(n->poll + index); |
| 574 | vhost_poll_flush(&n->dev.vqs[index].poll); |
| 575 | } |
| 576 | |
| 577 | static void vhost_net_flush(struct vhost_net *n) |
| 578 | { |
| 579 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); |
| 580 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); |
| 581 | } |
| 582 | |
| 583 | static int vhost_net_release(struct inode *inode, struct file *f) |
| 584 | { |
| 585 | struct vhost_net *n = f->private_data; |
| 586 | struct socket *tx_sock; |
| 587 | struct socket *rx_sock; |
| 588 | |
| 589 | vhost_net_stop(n, &tx_sock, &rx_sock); |
| 590 | vhost_net_flush(n); |
Michael S. Tsirkin | ea5d404 | 2011-11-27 19:05:58 +0200 | [diff] [blame] | 591 | vhost_dev_cleanup(&n->dev, false); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 592 | if (tx_sock) |
| 593 | fput(tx_sock->file); |
| 594 | if (rx_sock) |
| 595 | fput(rx_sock->file); |
| 596 | /* We do an extra flush before freeing memory, |
| 597 | * since jobs can re-queue themselves. */ |
| 598 | vhost_net_flush(n); |
| 599 | kfree(n); |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | static struct socket *get_raw_socket(int fd) |
| 604 | { |
| 605 | struct { |
| 606 | struct sockaddr_ll sa; |
| 607 | char buf[MAX_ADDR_LEN]; |
| 608 | } uaddr; |
| 609 | int uaddr_len = sizeof uaddr, r; |
| 610 | struct socket *sock = sockfd_lookup(fd, &r); |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 611 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 612 | if (!sock) |
| 613 | return ERR_PTR(-ENOTSOCK); |
| 614 | |
| 615 | /* Parameter checking */ |
| 616 | if (sock->sk->sk_type != SOCK_RAW) { |
| 617 | r = -ESOCKTNOSUPPORT; |
| 618 | goto err; |
| 619 | } |
| 620 | |
| 621 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, |
| 622 | &uaddr_len, 0); |
| 623 | if (r) |
| 624 | goto err; |
| 625 | |
| 626 | if (uaddr.sa.sll_family != AF_PACKET) { |
| 627 | r = -EPFNOSUPPORT; |
| 628 | goto err; |
| 629 | } |
| 630 | return sock; |
| 631 | err: |
| 632 | fput(sock->file); |
| 633 | return ERR_PTR(r); |
| 634 | } |
| 635 | |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 636 | static struct socket *get_tap_socket(int fd) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 637 | { |
| 638 | struct file *file = fget(fd); |
| 639 | struct socket *sock; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 640 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 641 | if (!file) |
| 642 | return ERR_PTR(-EBADF); |
| 643 | sock = tun_get_socket(file); |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 644 | if (!IS_ERR(sock)) |
| 645 | return sock; |
| 646 | sock = macvtap_get_socket(file); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 647 | if (IS_ERR(sock)) |
| 648 | fput(file); |
| 649 | return sock; |
| 650 | } |
| 651 | |
| 652 | static struct socket *get_socket(int fd) |
| 653 | { |
| 654 | struct socket *sock; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 655 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 656 | /* special case to disable backend */ |
| 657 | if (fd == -1) |
| 658 | return NULL; |
| 659 | sock = get_raw_socket(fd); |
| 660 | if (!IS_ERR(sock)) |
| 661 | return sock; |
Arnd Bergmann | 501c774 | 2010-02-18 05:46:50 +0000 | [diff] [blame] | 662 | sock = get_tap_socket(fd); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 663 | if (!IS_ERR(sock)) |
| 664 | return sock; |
| 665 | return ERR_PTR(-ENOTSOCK); |
| 666 | } |
| 667 | |
| 668 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) |
| 669 | { |
| 670 | struct socket *sock, *oldsock; |
| 671 | struct vhost_virtqueue *vq; |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 672 | struct vhost_ubuf_ref *ubufs, *oldubufs = NULL; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 673 | int r; |
| 674 | |
| 675 | mutex_lock(&n->dev.mutex); |
| 676 | r = vhost_dev_check_owner(&n->dev); |
| 677 | if (r) |
| 678 | goto err; |
| 679 | |
| 680 | if (index >= VHOST_NET_VQ_MAX) { |
| 681 | r = -ENOBUFS; |
| 682 | goto err; |
| 683 | } |
| 684 | vq = n->vqs + index; |
| 685 | mutex_lock(&vq->mutex); |
| 686 | |
| 687 | /* Verify that ring has been setup correctly. */ |
| 688 | if (!vhost_vq_access_ok(vq)) { |
| 689 | r = -EFAULT; |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 690 | goto err_vq; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 691 | } |
| 692 | sock = get_socket(fd); |
| 693 | if (IS_ERR(sock)) { |
| 694 | r = PTR_ERR(sock); |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 695 | goto err_vq; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | /* start polling new socket */ |
Arnd Bergmann | 28457ee | 2010-03-09 19:24:45 +0100 | [diff] [blame] | 699 | oldsock = rcu_dereference_protected(vq->private_data, |
| 700 | lockdep_is_held(&vq->mutex)); |
David S. Miller | 11fe883 | 2010-07-20 18:25:24 -0700 | [diff] [blame] | 701 | if (sock != oldsock) { |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 702 | ubufs = vhost_ubuf_alloc(vq, sock && vhost_sock_zcopy(sock)); |
| 703 | if (IS_ERR(ubufs)) { |
| 704 | r = PTR_ERR(ubufs); |
| 705 | goto err_ubufs; |
| 706 | } |
| 707 | oldubufs = vq->ubufs; |
| 708 | vq->ubufs = ubufs; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 709 | vhost_net_disable_vq(n, vq); |
| 710 | rcu_assign_pointer(vq->private_data, sock); |
| 711 | vhost_net_enable_vq(n, vq); |
Jason Wang | f59281d | 2011-06-21 18:04:27 +0800 | [diff] [blame] | 712 | |
| 713 | r = vhost_init_used(vq); |
| 714 | if (r) |
| 715 | goto err_vq; |
Jeff Dike | dd1f407 | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 716 | } |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 717 | |
Michael S. Tsirkin | 1680e90 | 2010-07-15 15:19:12 +0300 | [diff] [blame] | 718 | mutex_unlock(&vq->mutex); |
| 719 | |
Michael S. Tsirkin | c047e5f | 2011-07-20 13:41:31 +0300 | [diff] [blame] | 720 | if (oldubufs) { |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 721 | vhost_ubuf_put_and_wait(oldubufs); |
Michael S. Tsirkin | c047e5f | 2011-07-20 13:41:31 +0300 | [diff] [blame] | 722 | mutex_lock(&vq->mutex); |
| 723 | vhost_zerocopy_signal_used(vq); |
| 724 | mutex_unlock(&vq->mutex); |
| 725 | } |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 726 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 727 | if (oldsock) { |
| 728 | vhost_net_flush_vq(n, index); |
| 729 | fput(oldsock->file); |
| 730 | } |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 731 | |
Michael S. Tsirkin | 1680e90 | 2010-07-15 15:19:12 +0300 | [diff] [blame] | 732 | mutex_unlock(&n->dev.mutex); |
| 733 | return 0; |
| 734 | |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 735 | err_ubufs: |
| 736 | fput(sock->file); |
Jeff Dike | 1dace8c | 2010-03-04 16:10:14 -0500 | [diff] [blame] | 737 | err_vq: |
| 738 | mutex_unlock(&vq->mutex); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 739 | err: |
| 740 | mutex_unlock(&n->dev.mutex); |
| 741 | return r; |
| 742 | } |
| 743 | |
| 744 | static long vhost_net_reset_owner(struct vhost_net *n) |
| 745 | { |
| 746 | struct socket *tx_sock = NULL; |
| 747 | struct socket *rx_sock = NULL; |
| 748 | long err; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 749 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 750 | mutex_lock(&n->dev.mutex); |
| 751 | err = vhost_dev_check_owner(&n->dev); |
| 752 | if (err) |
| 753 | goto done; |
| 754 | vhost_net_stop(n, &tx_sock, &rx_sock); |
| 755 | vhost_net_flush(n); |
| 756 | err = vhost_dev_reset_owner(&n->dev); |
| 757 | done: |
| 758 | mutex_unlock(&n->dev.mutex); |
| 759 | if (tx_sock) |
| 760 | fput(tx_sock->file); |
| 761 | if (rx_sock) |
| 762 | fput(rx_sock->file); |
| 763 | return err; |
| 764 | } |
| 765 | |
| 766 | static int vhost_net_set_features(struct vhost_net *n, u64 features) |
| 767 | { |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 768 | size_t vhost_hlen, sock_hlen, hdr_len; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 769 | int i; |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 770 | |
| 771 | hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? |
| 772 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
| 773 | sizeof(struct virtio_net_hdr); |
| 774 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { |
| 775 | /* vhost provides vnet_hdr */ |
| 776 | vhost_hlen = hdr_len; |
| 777 | sock_hlen = 0; |
| 778 | } else { |
| 779 | /* socket provides vnet_hdr */ |
| 780 | vhost_hlen = 0; |
| 781 | sock_hlen = hdr_len; |
| 782 | } |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 783 | mutex_lock(&n->dev.mutex); |
| 784 | if ((features & (1 << VHOST_F_LOG_ALL)) && |
| 785 | !vhost_log_access_ok(&n->dev)) { |
| 786 | mutex_unlock(&n->dev.mutex); |
| 787 | return -EFAULT; |
| 788 | } |
| 789 | n->dev.acked_features = features; |
| 790 | smp_wmb(); |
| 791 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
| 792 | mutex_lock(&n->vqs[i].mutex); |
David Stevens | 8dd014a | 2010-07-27 18:52:21 +0300 | [diff] [blame] | 793 | n->vqs[i].vhost_hlen = vhost_hlen; |
| 794 | n->vqs[i].sock_hlen = sock_hlen; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 795 | mutex_unlock(&n->vqs[i].mutex); |
| 796 | } |
| 797 | vhost_net_flush(n); |
| 798 | mutex_unlock(&n->dev.mutex); |
| 799 | return 0; |
| 800 | } |
| 801 | |
| 802 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
| 803 | unsigned long arg) |
| 804 | { |
| 805 | struct vhost_net *n = f->private_data; |
| 806 | void __user *argp = (void __user *)arg; |
| 807 | u64 __user *featurep = argp; |
| 808 | struct vhost_vring_file backend; |
| 809 | u64 features; |
| 810 | int r; |
Krishna Kumar | d47effe | 2011-03-01 17:06:37 +0530 | [diff] [blame] | 811 | |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 812 | switch (ioctl) { |
| 813 | case VHOST_NET_SET_BACKEND: |
Takuya Yoshikawa | d3553a5 | 2010-05-27 19:01:58 +0900 | [diff] [blame] | 814 | if (copy_from_user(&backend, argp, sizeof backend)) |
| 815 | return -EFAULT; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 816 | return vhost_net_set_backend(n, backend.index, backend.fd); |
| 817 | case VHOST_GET_FEATURES: |
| 818 | features = VHOST_FEATURES; |
Takuya Yoshikawa | d3553a5 | 2010-05-27 19:01:58 +0900 | [diff] [blame] | 819 | if (copy_to_user(featurep, &features, sizeof features)) |
| 820 | return -EFAULT; |
| 821 | return 0; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 822 | case VHOST_SET_FEATURES: |
Takuya Yoshikawa | d3553a5 | 2010-05-27 19:01:58 +0900 | [diff] [blame] | 823 | if (copy_from_user(&features, featurep, sizeof features)) |
| 824 | return -EFAULT; |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 825 | if (features & ~VHOST_FEATURES) |
| 826 | return -EOPNOTSUPP; |
| 827 | return vhost_net_set_features(n, features); |
| 828 | case VHOST_RESET_OWNER: |
| 829 | return vhost_net_reset_owner(n); |
| 830 | default: |
| 831 | mutex_lock(&n->dev.mutex); |
| 832 | r = vhost_dev_ioctl(&n->dev, ioctl, arg); |
| 833 | vhost_net_flush(n); |
| 834 | mutex_unlock(&n->dev.mutex); |
| 835 | return r; |
| 836 | } |
| 837 | } |
| 838 | |
| 839 | #ifdef CONFIG_COMPAT |
| 840 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, |
| 841 | unsigned long arg) |
| 842 | { |
| 843 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); |
| 844 | } |
| 845 | #endif |
| 846 | |
Tobias Klauser | 373a83a | 2010-05-17 15:12:49 +0200 | [diff] [blame] | 847 | static const struct file_operations vhost_net_fops = { |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 848 | .owner = THIS_MODULE, |
| 849 | .release = vhost_net_release, |
| 850 | .unlocked_ioctl = vhost_net_ioctl, |
| 851 | #ifdef CONFIG_COMPAT |
| 852 | .compat_ioctl = vhost_net_compat_ioctl, |
| 853 | #endif |
| 854 | .open = vhost_net_open, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 855 | .llseek = noop_llseek, |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 856 | }; |
| 857 | |
| 858 | static struct miscdevice vhost_net_misc = { |
stephen hemminger | 7c7c7f0 | 2012-01-11 19:30:38 +0000 | [diff] [blame] | 859 | .minor = VHOST_NET_MINOR, |
| 860 | .name = "vhost-net", |
| 861 | .fops = &vhost_net_fops, |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 862 | }; |
| 863 | |
Christoph Hellwig | a8d3782 | 2010-04-13 14:11:25 -0400 | [diff] [blame] | 864 | static int vhost_net_init(void) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 865 | { |
Michael S. Tsirkin | bab632d | 2011-07-18 03:48:46 +0000 | [diff] [blame] | 866 | if (experimental_zcopytx) |
| 867 | vhost_enable_zcopy(VHOST_NET_VQ_TX); |
Tejun Heo | c23f344 | 2010-06-02 20:40:00 +0200 | [diff] [blame] | 868 | return misc_register(&vhost_net_misc); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 869 | } |
| 870 | module_init(vhost_net_init); |
| 871 | |
Christoph Hellwig | a8d3782 | 2010-04-13 14:11:25 -0400 | [diff] [blame] | 872 | static void vhost_net_exit(void) |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 873 | { |
| 874 | misc_deregister(&vhost_net_misc); |
Michael S. Tsirkin | 3a4d5c9 | 2010-01-14 06:17:27 +0000 | [diff] [blame] | 875 | } |
| 876 | module_exit(vhost_net_exit); |
| 877 | |
| 878 | MODULE_VERSION("0.0.1"); |
| 879 | MODULE_LICENSE("GPL v2"); |
| 880 | MODULE_AUTHOR("Michael S. Tsirkin"); |
| 881 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); |
stephen hemminger | 7c7c7f0 | 2012-01-11 19:30:38 +0000 | [diff] [blame] | 882 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
| 883 | MODULE_ALIAS("devname:vhost-net"); |