drivers/net/virtio/virtio_user/virtio_user_dev.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <fcntl.h>
   8 #include <string.h>
   9 #include <errno.h>
  10 #include <sys/mman.h>
  11 #include <unistd.h>
  12 #include <sys/eventfd.h>
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15
  16 #include "vhost.h"
  17 #include "virtio_user_dev.h"
  18 #include "../virtio_ethdev.h"
  19
  20 static int
  21 virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  22 {
  23         /* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
  24          * firstly because vhost depends on this msg to allocate virtqueue
  25          * pair.
  26          */
  27         struct vhost_vring_file file;
  28
  29         file.index = queue_sel;
  30         file.fd = dev->callfds[queue_sel];
  31         dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file);
  32
  33         return 0;
  34 }
  35
  36 static int
  37 virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
  38 {
  39         struct vhost_vring_file file;
  40         struct vhost_vring_state state;
  41         struct vring *vring = &dev->vrings[queue_sel];
  42         struct vhost_vring_addr addr = {
  43                 .index = queue_sel,
  44                 .desc_user_addr = (uint64_t)(uintptr_t)vring->desc,
  45                 .avail_user_addr = (uint64_t)(uintptr_t)vring->avail,
  46                 .used_user_addr = (uint64_t)(uintptr_t)vring->used,
  47                 .log_guest_addr = 0,
  48                 .flags = 0, /* disable log */
  49         };
  50
  51         state.index = queue_sel;
  52         state.num = vring->num;
  53         dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state);
  54
  55         state.index = queue_sel;
  56         state.num = 0; /* no reservation */
  57         dev->ops->send_request(dev, VHOST_USER_SET_VRING_BASE, &state);
  58
  59         dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr);
  60
  61         /* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
  62          * lastly because vhost depends on this msg to judge if
  63          * virtio is ready.
  64          */
  65         file.index = queue_sel;
  66         file.fd = dev->kickfds[queue_sel];
  67         dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file);
  68
  69         return 0;
  70 }
  71
  72 static int
  73 virtio_user_queue_setup(struct virtio_user_dev *dev,
  74                         int (*fn)(struct virtio_user_dev *, uint32_t))
  75 {
  76         uint32_t i, queue_sel;
  77
  78         for (i = 0; i < dev->max_queue_pairs; ++i) {
  79                 queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
  80                 if (fn(dev, queue_sel) < 0) {
  81                         PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i);
  82                         return -1;
  83                 }
  84         }
  85         for (i = 0; i < dev->max_queue_pairs; ++i) {
  86                 queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
  87                 if (fn(dev, queue_sel) < 0) {
  88                         PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i);
  89                         return -1;
  90                 }
  91         }
  92
  93         return 0;
  94 }
  95
  96 int
  97 virtio_user_start_device(struct virtio_user_dev *dev)
  98 {
  99         uint64_t features;
 100         int ret;
 101
 102         /* Step 0: tell vhost to create queues */
 103         if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
 104                 goto error;
 105
 106         /* Step 1: set features */
 107         features = dev->features;
 108         /* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
 109         features &= ~(1ull << VIRTIO_NET_F_MAC);
 110         /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 111         features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
 112         features &= ~(1ull << VIRTIO_NET_F_STATUS);
 113         ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
 114         if (ret < 0)
 115                 goto error;
 116         PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
 117
 118         /* Step 2: share memory regions */
 119         ret = dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
 120         if (ret < 0)
 121                 goto error;
 122
 123         /* Step 3: kick queues */
 124         if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0)
 125                 goto error;
 126
 127         /* Step 4: enable queues
 128          * we enable the 1st queue pair by default.
 129          */
 130         dev->ops->enable_qp(dev, 0, 1);
 131
 132         return 0;
 133 error:
 134         /* TODO: free resource here or caller to check */
 135         return -1;
 136 }
 137
 138 int virtio_user_stop_device(struct virtio_user_dev *dev)
 139 {
 140         uint32_t i;
 141
 142         for (i = 0; i < dev->max_queue_pairs; ++i)
 143                 dev->ops->enable_qp(dev, i, 0);
 144
 145         return 0;
 146 }
 147
 148 static inline void
 149 parse_mac(struct virtio_user_dev *dev, const char *mac)
 150 {
 151         int i, r;
 152         uint32_t tmp[ETHER_ADDR_LEN];
 153
 154         if (!mac)
 155                 return;
 156
 157         r = sscanf(mac, "%x:%x:%x:%x:%x:%x", &tmp[0],
 158                         &tmp[1], &tmp[2], &tmp[3], &tmp[4], &tmp[5]);
 159         if (r == ETHER_ADDR_LEN) {
 160                 for (i = 0; i < ETHER_ADDR_LEN; ++i)
 161                         dev->mac_addr[i] = (uint8_t)tmp[i];
 162                 dev->mac_specified = 1;
 163         } else {
 164                 /* ignore the wrong mac, use random mac */
 165                 PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
 166         }
 167 }
 168
 169 int
 170 is_vhost_user_by_type(const char *path)
 171 {
 172         struct stat sb;
 173
 174         if (stat(path, &sb) == -1)
 175                 return 0;
 176
 177         return S_ISSOCK(sb.st_mode);
 178 }
 179
 180 static int
 181 virtio_user_dev_init_notify(struct virtio_user_dev *dev)
 182 {
 183         uint32_t i, j;
 184         int callfd;
 185         int kickfd;
 186
 187         for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
 188                 if (i >= dev->max_queue_pairs * 2) {
 189                         dev->kickfds[i] = -1;
 190                         dev->callfds[i] = -1;
 191                         continue;
 192                 }
 193
 194                 /* May use invalid flag, but some backend uses kickfd and
 195                  * callfd as criteria to judge if dev is alive. so finally we
 196                  * use real event_fd.
 197                  */
 198                 callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 199                 if (callfd < 0) {
 200                         PMD_DRV_LOG(ERR, "callfd error, %s", strerror(errno));
 201                         break;
 202                 }
 203                 kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
 204                 if (kickfd < 0) {
 205                         PMD_DRV_LOG(ERR, "kickfd error, %s", strerror(errno));
 206                         break;
 207                 }
 208                 dev->callfds[i] = callfd;
 209                 dev->kickfds[i] = kickfd;
 210         }
 211
 212         if (i < VIRTIO_MAX_VIRTQUEUES) {
 213                 for (j = 0; j <= i; ++j) {
 214                         close(dev->callfds[j]);
 215                         close(dev->kickfds[j]);
 216                 }
 217
 218                 return -1;
 219         }
 220
 221         return 0;
 222 }
 223
 224 static int
 225 virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
 226 {
 227         uint32_t i;
 228         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
 229
 230         if (!eth_dev->intr_handle) {
 231                 eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle));
 232                 if (!eth_dev->intr_handle) {
 233                         PMD_DRV_LOG(ERR, "fail to allocate intr_handle");
 234                         return -1;
 235                 }
 236                 memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle));
 237         }
 238
 239         for (i = 0; i < dev->max_queue_pairs; ++i)
 240                 eth_dev->intr_handle->efds[i] = dev->callfds[i];
 241         eth_dev->intr_handle->nb_efd = dev->max_queue_pairs;
 242         eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1;
 243         eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV;
 244         /* For virtio vdev, no need to read counter for clean */
 245         eth_dev->intr_handle->efd_counter_size = 0;
 246         if (dev->vhostfd >= 0)
 247                 eth_dev->intr_handle->fd = dev->vhostfd;
 248
 249         return 0;
 250 }
 251
 252 static int
 253 virtio_user_dev_setup(struct virtio_user_dev *dev)
 254 {
 255         uint32_t q;
 256
 257         dev->vhostfd = -1;
 258         dev->vhostfds = NULL;
 259         dev->tapfds = NULL;
 260
 261         if (is_vhost_user_by_type(dev->path)) {
 262                 dev->ops = &ops_user;
 263         } else {
 264                 dev->ops = &ops_kernel;
 265
 266                 dev->vhostfds = malloc(dev->max_queue_pairs * sizeof(int));
 267                 dev->tapfds = malloc(dev->max_queue_pairs * sizeof(int));
 268                 if (!dev->vhostfds || !dev->tapfds) {
 269                         PMD_INIT_LOG(ERR, "Failed to malloc");
 270                         return -1;
 271                 }
 272
 273                 for (q = 0; q < dev->max_queue_pairs; ++q) {
 274                         dev->vhostfds[q] = -1;
 275                         dev->tapfds[q] = -1;
 276                 }
 277         }
 278
 279         if (dev->ops->setup(dev) < 0)
 280                 return -1;
 281
 282         if (virtio_user_dev_init_notify(dev) < 0)
 283                 return -1;
 284
 285         if (virtio_user_fill_intr_handle(dev) < 0)
 286                 return -1;
 287
 288         return 0;
 289 }
 290
 291 /* Use below macro to filter features from vhost backend */
 292 #define VIRTIO_USER_SUPPORTED_FEATURES                  \
 293         (1ULL << VIRTIO_NET_F_MAC               |       \
 294          1ULL << VIRTIO_NET_F_STATUS            |       \
 295          1ULL << VIRTIO_NET_F_MQ                |       \
 296          1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR     |       \
 297          1ULL << VIRTIO_NET_F_CTRL_VQ           |       \
 298          1ULL << VIRTIO_NET_F_CTRL_RX           |       \
 299          1ULL << VIRTIO_NET_F_CTRL_VLAN         |       \
 300          1ULL << VIRTIO_NET_F_CSUM              |       \
 301          1ULL << VIRTIO_NET_F_HOST_TSO4         |       \
 302          1ULL << VIRTIO_NET_F_HOST_TSO6         |       \
 303          1ULL << VIRTIO_NET_F_MRG_RXBUF         |       \
 304          1ULL << VIRTIO_RING_F_INDIRECT_DESC    |       \
 305          1ULL << VIRTIO_NET_F_GUEST_CSUM        |       \
 306          1ULL << VIRTIO_NET_F_GUEST_TSO4        |       \
 307          1ULL << VIRTIO_NET_F_GUEST_TSO6        |       \
 308          1ULL << VIRTIO_F_VERSION_1)
 309
 310 int
 311 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 312                      int cq, int queue_size, const char *mac, char **ifname)
 313 {
 314         snprintf(dev->path, PATH_MAX, "%s", path);
 315         dev->max_queue_pairs = queues;
 316         dev->queue_pairs = 1; /* mq disabled by default */
 317         dev->queue_size = queue_size;
 318         dev->mac_specified = 0;
 319         parse_mac(dev, mac);
 320
 321         if (*ifname) {
 322                 dev->ifname = *ifname;
 323                 *ifname = NULL;
 324         }
 325
 326         if (virtio_user_dev_setup(dev) < 0) {
 327                 PMD_INIT_LOG(ERR, "backend set up fails");
 328                 return -1;
 329         }
 330         if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER, NULL) < 0) {
 331                 PMD_INIT_LOG(ERR, "set_owner fails: %s", strerror(errno));
 332                 return -1;
 333         }
 334
 335         if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
 336                             &dev->device_features) < 0) {
 337                 PMD_INIT_LOG(ERR, "get_features failed: %s", strerror(errno));
 338                 return -1;
 339         }
 340         if (dev->mac_specified)
 341                 dev->device_features |= (1ull << VIRTIO_NET_F_MAC);
 342
 343         if (cq) {
 344                 /* device does not really need to know anything about CQ,
 345                  * so if necessary, we just claim to support CQ
 346                  */
 347                 dev->device_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
 348         } else {
 349                 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
 350                 /* Also disable features depends on VIRTIO_NET_F_CTRL_VQ */
 351                 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_RX);
 352                 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_VLAN);
 353                 dev->device_features &= ~(1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
 354                 dev->device_features &= ~(1ull << VIRTIO_NET_F_MQ);
 355                 dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 356         }
 357
 358         /* The backend will not report this feature, we add it explicitly */
 359         if (is_vhost_user_by_type(dev->path))
 360                 dev->device_features |= (1ull << VIRTIO_NET_F_STATUS);
 361
 362         dev->device_features &= VIRTIO_USER_SUPPORTED_FEATURES;
 363
 364         return 0;
 365 }
 366
 367 void
 368 virtio_user_dev_uninit(struct virtio_user_dev *dev)
 369 {
 370         uint32_t i;
 371
 372         virtio_user_stop_device(dev);
 373
 374         for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
 375                 close(dev->callfds[i]);
 376                 close(dev->kickfds[i]);
 377         }
 378
 379         close(dev->vhostfd);
 380
 381         if (dev->vhostfds) {
 382                 for (i = 0; i < dev->max_queue_pairs; ++i)
 383                         close(dev->vhostfds[i]);
 384                 free(dev->vhostfds);
 385                 free(dev->tapfds);
 386         }
 387
 388         free(dev->ifname);
 389 }
 390
 391 static uint8_t
 392 virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
 393 {
 394         uint16_t i;
 395         uint8_t ret = 0;
 396
 397         if (q_pairs > dev->max_queue_pairs) {
 398                 PMD_INIT_LOG(ERR, "multi-q config %u, but only %u supported",
 399                              q_pairs, dev->max_queue_pairs);
 400                 return -1;
 401         }
 402
 403         for (i = 0; i < q_pairs; ++i)
 404                 ret |= dev->ops->enable_qp(dev, i, 1);
 405         for (i = q_pairs; i < dev->max_queue_pairs; ++i)
 406                 ret |= dev->ops->enable_qp(dev, i, 0);
 407
 408         dev->queue_pairs = q_pairs;
 409
 410         return ret;
 411 }
 412
 413 static uint32_t
 414 virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
 415                             uint16_t idx_hdr)
 416 {
 417         struct virtio_net_ctrl_hdr *hdr;
 418         virtio_net_ctrl_ack status = ~0;
 419         uint16_t i, idx_data, idx_status;
 420         uint32_t n_descs = 0;
 421
 422         /* locate desc for header, data, and status */
 423         idx_data = vring->desc[idx_hdr].next;
 424         n_descs++;
 425
 426         i = idx_data;
 427         while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
 428                 i = vring->desc[i].next;
 429                 n_descs++;
 430         }
 431
 432         /* locate desc for status */
 433         idx_status = i;
 434         n_descs++;
 435
 436         hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
 437         if (hdr->class == VIRTIO_NET_CTRL_MQ &&
 438             hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
 439                 uint16_t queues;
 440
 441                 queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
 442                 status = virtio_user_handle_mq(dev, queues);
 443         }
 444
 445         /* Update status */
 446         *(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
 447
 448         return n_descs;
 449 }
 450
 451 void
 452 virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 453 {
 454         uint16_t avail_idx, desc_idx;
 455         struct vring_used_elem *uep;
 456         uint32_t n_descs;
 457         struct vring *vring = &dev->vrings[queue_idx];
 458
 459         /* Consume avail ring, using used ring idx as first one */
 460         while (vring->used->idx != vring->avail->idx) {
 461                 avail_idx = (vring->used->idx) & (vring->num - 1);
 462                 desc_idx = vring->avail->ring[avail_idx];
 463
 464                 n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
 465
 466                 /* Update used ring */
 467                 uep = &vring->used->ring[avail_idx];
 468                 uep->id = avail_idx;
 469                 uep->len = n_descs;
 470
 471                 vring->used->idx++;
 472         }
 473 }