ceph/src/dpdk/drivers/net/virtio/virtio_user_ethdev.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdint.h>
  35 #include <sys/types.h>
  36 #include <unistd.h>
  37
  38 #include <rte_malloc.h>
  39 #include <rte_kvargs.h>
  40 #include <rte_vdev.h>
  41
  42 #include "virtio_ethdev.h"
  43 #include "virtio_logs.h"
  44 #include "virtio_pci.h"
  45 #include "virtqueue.h"
  46 #include "virtio_rxtx.h"
  47 #include "virtio_user/virtio_user_dev.h"
  48
  49 #define virtio_user_get_dev(hw) \
  50         ((struct virtio_user_dev *)(hw)->virtio_user_dev)
  51
  52 static void
  53 virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset,
  54                      void *dst, int length)
  55 {
  56         int i;
  57         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
  58
  59         if (offset == offsetof(struct virtio_net_config, mac) &&
  60             length == ETHER_ADDR_LEN) {
  61                 for (i = 0; i < ETHER_ADDR_LEN; ++i)
  62                         ((uint8_t *)dst)[i] = dev->mac_addr[i];
  63                 return;
  64         }
  65
  66         if (offset == offsetof(struct virtio_net_config, status))
  67                 *(uint16_t *)dst = dev->status;
  68
  69         if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
  70                 *(uint16_t *)dst = dev->max_queue_pairs;
  71 }
  72
  73 static void
  74 virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset,
  75                       const void *src, int length)
  76 {
  77         int i;
  78         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
  79
  80         if ((offset == offsetof(struct virtio_net_config, mac)) &&
  81             (length == ETHER_ADDR_LEN))
  82                 for (i = 0; i < ETHER_ADDR_LEN; ++i)
  83                         dev->mac_addr[i] = ((const uint8_t *)src)[i];
  84         else
  85                 PMD_DRV_LOG(ERR, "not supported offset=%zu, len=%d\n",
  86                             offset, length);
  87 }
  88
  89 static void
  90 virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
  91 {
  92         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
  93
  94         if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
  95                 virtio_user_start_device(dev);
  96         dev->status = status;
  97 }
  98
  99 static void
 100 virtio_user_reset(struct virtio_hw *hw)
 101 {
 102         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 103
 104         virtio_user_stop_device(dev);
 105 }
 106
 107 static uint8_t
 108 virtio_user_get_status(struct virtio_hw *hw)
 109 {
 110         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 111
 112         return dev->status;
 113 }
 114
 115 static uint64_t
 116 virtio_user_get_features(struct virtio_hw *hw)
 117 {
 118         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 119
 120         return dev->features;
 121 }
 122
 123 static void
 124 virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
 125 {
 126         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 127
 128         dev->features = features;
 129 }
 130
 131 static uint8_t
 132 virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
 133 {
 134         /* When config interrupt happens, driver calls this function to query
 135          * what kinds of change happen. Interrupt mode not supported for now.
 136          */
 137         return 0;
 138 }
 139
 140 static uint16_t
 141 virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
 142                     uint16_t vec __rte_unused)
 143 {
 144         return VIRTIO_MSI_NO_VECTOR;
 145 }
 146
 147 /* This function is to get the queue size, aka, number of descs, of a specified
 148  * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the
 149  * max supported queues.
 150  */
 151 static uint16_t
 152 virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
 153 {
 154         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 155
 156         /* Currently, each queue has same queue size */
 157         return dev->queue_size;
 158 }
 159
 160 static int
 161 virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
 162 {
 163         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 164         uint16_t queue_idx = vq->vq_queue_index;
 165         uint64_t desc_addr, avail_addr, used_addr;
 166
 167         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 168         avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
 169         used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
 170                                                          ring[vq->vq_nentries]),
 171                                    VIRTIO_PCI_VRING_ALIGN);
 172
 173         dev->vrings[queue_idx].num = vq->vq_nentries;
 174         dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
 175         dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
 176         dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
 177
 178         return 0;
 179 }
 180
 181 static void
 182 virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 183 {
 184         /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
 185          * correspondingly stops the ioeventfds, and reset the status of
 186          * the device.
 187          * For modern devices, set queue desc, avail, used in PCI bar to 0,
 188          * not see any more behavior in QEMU.
 189          *
 190          * Here we just care about what information to deliver to vhost-user
 191          * or vhost-kernel. So we just close ioeventfd for now.
 192          */
 193         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 194
 195         close(dev->callfds[vq->vq_queue_index]);
 196         close(dev->kickfds[vq->vq_queue_index]);
 197 }
 198
 199 static void
 200 virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 201 {
 202         uint64_t buf = 1;
 203         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 204
 205         if (hw->cvq && (hw->cvq->vq == vq)) {
 206                 virtio_user_handle_cq(dev, vq->vq_queue_index);
 207                 return;
 208         }
 209
 210         if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
 211                 PMD_DRV_LOG(ERR, "failed to kick backend: %s\n",
 212                             strerror(errno));
 213 }
 214
 215 static const struct virtio_pci_ops virtio_user_ops = {
 216         .read_dev_cfg   = virtio_user_read_dev_config,
 217         .write_dev_cfg  = virtio_user_write_dev_config,
 218         .reset          = virtio_user_reset,
 219         .get_status     = virtio_user_get_status,
 220         .set_status     = virtio_user_set_status,
 221         .get_features   = virtio_user_get_features,
 222         .set_features   = virtio_user_set_features,
 223         .get_isr        = virtio_user_get_isr,
 224         .set_config_irq = virtio_user_set_config_irq,
 225         .get_queue_num  = virtio_user_get_queue_num,
 226         .setup_queue    = virtio_user_setup_queue,
 227         .del_queue      = virtio_user_del_queue,
 228         .notify_queue   = virtio_user_notify_queue,
 229 };
 230
 231 static const char *valid_args[] = {
 232 #define VIRTIO_USER_ARG_QUEUES_NUM     "queues"
 233         VIRTIO_USER_ARG_QUEUES_NUM,
 234 #define VIRTIO_USER_ARG_CQ_NUM         "cq"
 235         VIRTIO_USER_ARG_CQ_NUM,
 236 #define VIRTIO_USER_ARG_MAC            "mac"
 237         VIRTIO_USER_ARG_MAC,
 238 #define VIRTIO_USER_ARG_PATH           "path"
 239         VIRTIO_USER_ARG_PATH,
 240 #define VIRTIO_USER_ARG_QUEUE_SIZE     "queue_size"
 241         VIRTIO_USER_ARG_QUEUE_SIZE,
 242         NULL
 243 };
 244
 245 #define VIRTIO_USER_DEF_CQ_EN   0
 246 #define VIRTIO_USER_DEF_Q_NUM   1
 247 #define VIRTIO_USER_DEF_Q_SZ    256
 248
 249 static int
 250 get_string_arg(const char *key __rte_unused,
 251                const char *value, void *extra_args)
 252 {
 253         if (!value || !extra_args)
 254                 return -EINVAL;
 255
 256         *(char **)extra_args = strdup(value);
 257
 258         return 0;
 259 }
 260
 261 static int
 262 get_integer_arg(const char *key __rte_unused,
 263                 const char *value, void *extra_args)
 264 {
 265         if (!value || !extra_args)
 266                 return -EINVAL;
 267
 268         *(uint64_t *)extra_args = strtoull(value, NULL, 0);
 269
 270         return 0;
 271 }
 272
 273 static struct rte_eth_dev *
 274 virtio_user_eth_dev_alloc(const char *name)
 275 {
 276         struct rte_eth_dev *eth_dev;
 277         struct rte_eth_dev_data *data;
 278         struct virtio_hw *hw;
 279         struct virtio_user_dev *dev;
 280
 281         eth_dev = rte_eth_dev_allocate(name);
 282         if (!eth_dev) {
 283                 PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev");
 284                 return NULL;
 285         }
 286
 287         data = eth_dev->data;
 288
 289         hw = rte_zmalloc(NULL, sizeof(*hw), 0);
 290         if (!hw) {
 291                 PMD_INIT_LOG(ERR, "malloc virtio_hw failed");
 292                 rte_eth_dev_release_port(eth_dev);
 293                 return NULL;
 294         }
 295
 296         dev = rte_zmalloc(NULL, sizeof(*dev), 0);
 297         if (!dev) {
 298                 PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed");
 299                 rte_eth_dev_release_port(eth_dev);
 300                 rte_free(hw);
 301                 return NULL;
 302         }
 303
 304         hw->vtpci_ops = &virtio_user_ops;
 305         hw->use_msix = 0;
 306         hw->modern   = 0;
 307         hw->use_simple_rxtx = 0;
 308         hw->virtio_user_dev = dev;
 309         data->dev_private = hw;
 310         data->numa_node = SOCKET_ID_ANY;
 311         data->kdrv = RTE_KDRV_NONE;
 312         data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 313         eth_dev->pci_dev = NULL;
 314         eth_dev->driver = NULL;
 315         return eth_dev;
 316 }
 317
 318 static void
 319 virtio_user_eth_dev_free(struct rte_eth_dev *eth_dev)
 320 {
 321         struct rte_eth_dev_data *data = eth_dev->data;
 322         struct virtio_hw *hw = data->dev_private;
 323
 324         rte_free(hw->virtio_user_dev);
 325         rte_free(hw);
 326         rte_eth_dev_release_port(eth_dev);
 327 }
 328
 329 /* Dev initialization routine. Invoked once for each virtio vdev at
 330  * EAL init time, see rte_eal_dev_init().
 331  * Returns 0 on success.
 332  */
 333 static int
 334 virtio_user_pmd_probe(const char *name, const char *params)
 335 {
 336         struct rte_kvargs *kvlist = NULL;
 337         struct rte_eth_dev *eth_dev;
 338         struct virtio_hw *hw;
 339         uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
 340         uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
 341         uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
 342         char *path = NULL;
 343         char *mac_addr = NULL;
 344         int ret = -1;
 345
 346         if (!params || params[0] == '\0') {
 347                 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio_user",
 348                           VIRTIO_USER_ARG_QUEUE_SIZE);
 349                 goto end;
 350         }
 351
 352         kvlist = rte_kvargs_parse(params, valid_args);
 353         if (!kvlist) {
 354                 PMD_INIT_LOG(ERR, "error when parsing param");
 355                 goto end;
 356         }
 357
 358         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) {
 359                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
 360                                        &get_string_arg, &path) < 0) {
 361                         PMD_INIT_LOG(ERR, "error to parse %s",
 362                                      VIRTIO_USER_ARG_PATH);
 363                         goto end;
 364                 }
 365         } else {
 366                 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio_user\n",
 367                           VIRTIO_USER_ARG_QUEUE_SIZE);
 368                 goto end;
 369         }
 370
 371         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
 372                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
 373                                        &get_string_arg, &mac_addr) < 0) {
 374                         PMD_INIT_LOG(ERR, "error to parse %s",
 375                                      VIRTIO_USER_ARG_MAC);
 376                         goto end;
 377                 }
 378         }
 379
 380         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
 381                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
 382                                        &get_integer_arg, &queue_size) < 0) {
 383                         PMD_INIT_LOG(ERR, "error to parse %s",
 384                                      VIRTIO_USER_ARG_QUEUE_SIZE);
 385                         goto end;
 386                 }
 387         }
 388
 389         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
 390                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
 391                                        &get_integer_arg, &queues) < 0) {
 392                         PMD_INIT_LOG(ERR, "error to parse %s",
 393                                      VIRTIO_USER_ARG_QUEUES_NUM);
 394                         goto end;
 395                 }
 396         }
 397
 398         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
 399                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
 400                                        &get_integer_arg, &cq) < 0) {
 401                         PMD_INIT_LOG(ERR, "error to parse %s",
 402                                      VIRTIO_USER_ARG_CQ_NUM);
 403                         goto end;
 404                 }
 405         } else if (queues > 1) {
 406                 cq = 1;
 407         }
 408
 409         if (queues > 1 && cq == 0) {
 410                 PMD_INIT_LOG(ERR, "multi-q requires ctrl-q");
 411                 goto end;
 412         }
 413
 414         eth_dev = virtio_user_eth_dev_alloc(name);
 415         if (!eth_dev) {
 416                 PMD_INIT_LOG(ERR, "virtio_user fails to alloc device");
 417                 goto end;
 418         }
 419
 420         hw = eth_dev->data->dev_private;
 421         if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
 422                                  queue_size, mac_addr) < 0) {
 423                 PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
 424                 virtio_user_eth_dev_free(eth_dev);
 425                 goto end;
 426         }
 427
 428         /* previously called by rte_eal_pci_probe() for physical dev */
 429         if (eth_virtio_dev_init(eth_dev) < 0) {
 430                 PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 431                 virtio_user_eth_dev_free(eth_dev);
 432                 goto end;
 433         }
 434         ret = 0;
 435
 436 end:
 437         if (kvlist)
 438                 rte_kvargs_free(kvlist);
 439         if (path)
 440                 free(path);
 441         if (mac_addr)
 442                 free(mac_addr);
 443         return ret;
 444 }
 445
 446 /** Called by rte_eth_dev_detach() */
 447 static int
 448 virtio_user_pmd_remove(const char *name)
 449 {
 450         struct rte_eth_dev *eth_dev;
 451         struct virtio_hw *hw;
 452         struct virtio_user_dev *dev;
 453
 454         if (!name)
 455                 return -EINVAL;
 456
 457         PMD_DRV_LOG(INFO, "Un-Initializing %s\n", name);
 458         eth_dev = rte_eth_dev_allocated(name);
 459         if (!eth_dev)
 460                 return -ENODEV;
 461
 462         /* make sure the device is stopped, queues freed */
 463         rte_eth_dev_close(eth_dev->data->port_id);
 464
 465         hw = eth_dev->data->dev_private;
 466         dev = hw->virtio_user_dev;
 467         virtio_user_dev_uninit(dev);
 468
 469         rte_free(eth_dev->data->dev_private);
 470         rte_free(eth_dev->data);
 471         rte_eth_dev_release_port(eth_dev);
 472
 473         return 0;
 474 }
 475
 476 static struct rte_vdev_driver virtio_user_driver = {
 477         .probe = virtio_user_pmd_probe,
 478         .remove = virtio_user_pmd_remove,
 479 };
 480
 481 RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);
 482 RTE_PMD_REGISTER_ALIAS(net_virtio_user, virtio_user);
 483 RTE_PMD_REGISTER_PARAM_STRING(net_virtio_user,
 484         "path=<path> "
 485         "mac=<mac addr> "
 486         "cq=<int> "
 487         "queue_size=<int> "
 488         "queues=<int>");