drivers/net/xenvirt/rte_eth_xenvirt.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2015 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 <unistd.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <sys/types.h>
  39 #include <sys/mman.h>
  40 #include <errno.h>
  41 #include <sys/user.h>
  42 #ifndef PAGE_SIZE
  43 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
  44 #endif
  45 #include <linux/binfmts.h>
  46 #include <xen/xen-compat.h>
  47 #if __XEN_LATEST_INTERFACE_VERSION__ < 0x00040200
  48 #include <xs.h>
  49 #else
  50 #include <xenstore.h>
  51 #endif
  52 #include <linux/virtio_ring.h>
  53
  54 #include <rte_mbuf.h>
  55 #include <rte_ethdev.h>
  56 #include <rte_malloc.h>
  57 #include <rte_memcpy.h>
  58 #include <rte_string_fns.h>
  59 #include <rte_vdev.h>
  60 #include <cmdline_parse.h>
  61 #include <cmdline_parse_etheraddr.h>
  62
  63 #include "rte_xen_lib.h"
  64 #include "virtqueue.h"
  65 #include "rte_eth_xenvirt.h"
  66
  67 #define VQ_DESC_NUM 256
  68 #define VIRTIO_MBUF_BURST_SZ 64
  69
  70 /* virtio_idx is increased after new device is created.*/
  71 static int virtio_idx = 0;
  72
  73 static struct rte_eth_link pmd_link = {
  74                 .link_speed = ETH_SPEED_NUM_10G,
  75                 .link_duplex = ETH_LINK_FULL_DUPLEX,
  76                 .link_status = ETH_LINK_DOWN,
  77                 .link_autoneg = ETH_LINK_SPEED_FIXED
  78 };
  79
  80 static void
  81 eth_xenvirt_free_queues(struct rte_eth_dev *dev);
  82
  83 static uint16_t
  84 eth_xenvirt_rx(void *q, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
  85 {
  86         struct virtqueue *rxvq = q;
  87         struct rte_mbuf *rxm, *new_mbuf;
  88         uint16_t nb_used, num;
  89         uint32_t len[VIRTIO_MBUF_BURST_SZ];
  90         uint32_t i;
  91         struct pmd_internals *pi = rxvq->internals;
  92
  93         nb_used = VIRTQUEUE_NUSED(rxvq);
  94
  95         rte_smp_rmb();
  96         num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
  97         num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
  98         if (unlikely(num == 0)) return 0;
  99
 100         num = virtqueue_dequeue_burst(rxvq, rx_pkts, len, num);
 101         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d\n", nb_used, num);
 102         for (i = 0; i < num ; i ++) {
 103                 rxm = rx_pkts[i];
 104                 PMD_RX_LOG(DEBUG, "packet len:%d\n", len[i]);
 105                 rxm->next = NULL;
 106                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 107                 rxm->data_len = (uint16_t)(len[i] - sizeof(struct virtio_net_hdr));
 108                 rxm->nb_segs = 1;
 109                 rxm->port = pi->port_id;
 110                 rxm->pkt_len  = (uint32_t)(len[i] - sizeof(struct virtio_net_hdr));
 111         }
 112         /* allocate new mbuf for the used descriptor */
 113         while (likely(!virtqueue_full(rxvq))) {
 114                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 115                 if (unlikely(new_mbuf == NULL)) {
 116                         break;
 117                 }
 118                 if (unlikely(virtqueue_enqueue_recv_refill(rxvq, new_mbuf))) {
 119                         rte_pktmbuf_free_seg(new_mbuf);
 120                         break;
 121                 }
 122         }
 123         pi->eth_stats.ipackets += num;
 124         return num;
 125 }
 126
 127 static uint16_t
 128 eth_xenvirt_tx(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 129 {
 130         struct virtqueue *txvq = tx_queue;
 131         struct rte_mbuf *txm;
 132         uint16_t nb_used, nb_tx, num, i;
 133         int error;
 134         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 135         struct rte_mbuf *snd_pkts[VIRTIO_MBUF_BURST_SZ];
 136         struct pmd_internals *pi = txvq->internals;
 137
 138         nb_tx = 0;
 139
 140         if (unlikely(nb_pkts == 0))
 141                 return 0;
 142
 143         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
 144         nb_used = VIRTQUEUE_NUSED(txvq);
 145
 146         rte_smp_rmb();
 147
 148         num = (uint16_t)(likely(nb_used <= VIRTIO_MBUF_BURST_SZ) ? nb_used : VIRTIO_MBUF_BURST_SZ);
 149         num = virtqueue_dequeue_burst(txvq, snd_pkts, len, num);
 150
 151         for (i = 0; i < num ; i ++) {
 152                 /* mergable not supported, one segment only */
 153                 rte_pktmbuf_free_seg(snd_pkts[i]);
 154         }
 155
 156         while (nb_tx < nb_pkts) {
 157                 if (likely(!virtqueue_full(txvq))) {
 158                 /* TODO drop tx_pkts if it contains multiple segments */
 159                         txm = tx_pkts[nb_tx];
 160                         error = virtqueue_enqueue_xmit(txvq, txm);
 161                         if (unlikely(error)) {
 162                                 if (error == ENOSPC)
 163                                         PMD_TX_LOG(ERR, "virtqueue_enqueue Free count = 0\n");
 164                                 else if (error == EMSGSIZE)
 165                                         PMD_TX_LOG(ERR, "virtqueue_enqueue Free count < 1\n");
 166                                 else
 167                                         PMD_TX_LOG(ERR, "virtqueue_enqueue error: %d\n", error);
 168                                 break;
 169                         }
 170                         nb_tx++;
 171                 } else {
 172                         PMD_TX_LOG(ERR, "No free tx descriptors to transmit\n");
 173                         /* virtqueue_notify not needed in our para-virt solution */
 174                         break;
 175                 }
 176         }
 177         pi->eth_stats.opackets += nb_tx;
 178         return nb_tx;
 179 }
 180
 181 static int
 182 eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
 183 {
 184         RTE_LOG(ERR, PMD, "%s\n", __func__);
 185         return 0;
 186 }
 187
 188 /*
 189  * Create a shared page between guest and host.
 190  * Host monitors this page if it is cleared on unmap, and then
 191  * do necessary clean up.
 192  */
 193 static void
 194 gntalloc_vring_flag(int vtidx)
 195 {
 196         char key_str[PATH_MAX];
 197         char val_str[PATH_MAX];
 198         uint32_t gref_tmp;
 199         void *ptr;
 200
 201         if (grefwatch_from_alloc(&gref_tmp, &ptr)) {
 202                 RTE_LOG(ERR, PMD, "grefwatch_from_alloc error\n");
 203                 exit(0);
 204         }
 205
 206         *(uint8_t *)ptr = MAP_FLAG;
 207         snprintf(val_str, sizeof(val_str), "%u", gref_tmp);
 208         snprintf(key_str, sizeof(key_str),
 209                 DPDK_XENSTORE_PATH"%d"VRING_FLAG_STR, vtidx);
 210         xenstore_write(key_str, val_str);
 211 }
 212
 213 /*
 214  * Notify host this virtio device is started.
 215  * Host could start polling this device.
 216  */
 217 static void
 218 dev_start_notify(int vtidx)
 219 {
 220         char key_str[PATH_MAX];
 221         char val_str[PATH_MAX];
 222
 223         RTE_LOG(INFO, PMD, "%s: virtio %d is started\n", __func__, vtidx);
 224         gntalloc_vring_flag(vtidx);
 225
 226         snprintf(key_str, sizeof(key_str), "%s%s%d",
 227                 DPDK_XENSTORE_PATH, EVENT_TYPE_START_STR,
 228                         vtidx);
 229         snprintf(val_str, sizeof(val_str), "1");
 230         xenstore_write(key_str, val_str);
 231 }
 232
 233 /*
 234  * Notify host this virtio device is stopped.
 235  * Host could stop polling this device.
 236  */
 237 static void
 238 dev_stop_notify(int vtidx)
 239 {
 240         RTE_SET_USED(vtidx);
 241 }
 242
 243
 244 static int
 245 update_mac_address(struct ether_addr *mac_addrs, int vtidx)
 246 {
 247         char key_str[PATH_MAX];
 248         char val_str[PATH_MAX];
 249         int rv;
 250
 251         if (mac_addrs == NULL) {
 252                 RTE_LOG(ERR, PMD, "%s: NULL pointer mac specified\n", __func__);
 253                 return -1;
 254         }
 255         rv = snprintf(key_str, sizeof(key_str),
 256                         DPDK_XENSTORE_PATH"%d_ether_addr", vtidx);
 257         if (rv == -1)
 258                 return rv;
 259         rv = snprintf(val_str, sizeof(val_str), "%02x:%02x:%02x:%02x:%02x:%02x",
 260                         mac_addrs->addr_bytes[0],
 261                         mac_addrs->addr_bytes[1],
 262                         mac_addrs->addr_bytes[2],
 263                         mac_addrs->addr_bytes[3],
 264                         mac_addrs->addr_bytes[4],
 265                         mac_addrs->addr_bytes[5]);
 266         if (rv == -1)
 267                 return rv;
 268         if (xenstore_write(key_str, val_str))
 269                 return rv;
 270         return 0;
 271 }
 272
 273
 274 static int
 275 eth_dev_start(struct rte_eth_dev *dev)
 276 {
 277         struct virtqueue *rxvq = dev->data->rx_queues[0];
 278         struct virtqueue *txvq = dev->data->tx_queues[0];
 279         struct rte_mbuf *m;
 280         struct pmd_internals *pi = (struct pmd_internals *)dev->data->dev_private;
 281         int rv;
 282
 283         dev->data->dev_link.link_status = ETH_LINK_UP;
 284         while (!virtqueue_full(rxvq)) {
 285                 m = rte_mbuf_raw_alloc(rxvq->mpool);
 286                 if (m == NULL)
 287                         break;
 288                 /* Enqueue allocated buffers. */
 289                 if (virtqueue_enqueue_recv_refill(rxvq, m)) {
 290                         rte_pktmbuf_free_seg(m);
 291                         break;
 292                 }
 293         }
 294
 295         rxvq->internals = pi;
 296         txvq->internals = pi;
 297
 298         rv = update_mac_address(dev->data->mac_addrs, pi->virtio_idx);
 299         if (rv)
 300                 return -1;
 301         dev_start_notify(pi->virtio_idx);
 302
 303         return 0;
 304 }
 305
 306 static void
 307 eth_dev_stop(struct rte_eth_dev *dev)
 308 {
 309         struct pmd_internals *pi = (struct pmd_internals *)dev->data->dev_private;
 310
 311         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 312         dev_stop_notify(pi->virtio_idx);
 313 }
 314
 315 /*
 316  * Notify host this virtio device is closed.
 317  * Host could do necessary clean up to this device.
 318  */
 319 static void
 320 eth_dev_close(struct rte_eth_dev *dev)
 321 {
 322         eth_xenvirt_free_queues(dev);
 323 }
 324
 325 static void
 326 eth_dev_info(struct rte_eth_dev *dev,
 327                 struct rte_eth_dev_info *dev_info)
 328 {
 329         struct pmd_internals *internals = dev->data->dev_private;
 330
 331         RTE_SET_USED(internals);
 332         dev_info->max_mac_addrs = 1;
 333         dev_info->max_rx_pktlen = (uint32_t)2048;
 334         dev_info->max_rx_queues = (uint16_t)1;
 335         dev_info->max_tx_queues = (uint16_t)1;
 336         dev_info->min_rx_bufsize = 0;
 337 }
 338
 339 static void
 340 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 341 {
 342         struct pmd_internals *internals = dev->data->dev_private;
 343         if(stats)
 344                 rte_memcpy(stats, &internals->eth_stats, sizeof(*stats));
 345 }
 346
 347 static void
 348 eth_stats_reset(struct rte_eth_dev *dev)
 349 {
 350         struct pmd_internals *internals = dev->data->dev_private;
 351         /* Reset software totals */
 352         memset(&internals->eth_stats, 0, sizeof(internals->eth_stats));
 353 }
 354
 355 static void
 356 eth_queue_release(void *q)
 357 {
 358         rte_free(q);
 359 }
 360
 361 static int
 362 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 363                 int wait_to_complete __rte_unused)
 364 {
 365         return 0;
 366 }
 367
 368 /*
 369  * Create shared vring between guest and host.
 370  * Memory is allocated through grant alloc driver, so it is not physical continuous.
 371  */
 372 static void *
 373 gntalloc_vring_create(int queue_type, uint32_t size, int vtidx)
 374 {
 375         char key_str[PATH_MAX] = {0};
 376         char val_str[PATH_MAX] = {0};
 377         void *va = NULL;
 378         int pg_size;
 379         uint32_t pg_num;
 380         uint32_t *gref_arr = NULL;
 381         phys_addr_t *pa_arr = NULL;
 382         uint64_t start_index;
 383         int rv;
 384
 385         pg_size = getpagesize();
 386         size    = RTE_ALIGN_CEIL(size, pg_size);
 387         pg_num  = size / pg_size;
 388
 389         gref_arr = calloc(pg_num, sizeof(gref_arr[0]));
 390         pa_arr  = calloc(pg_num, sizeof(pa_arr[0]));
 391
 392         if (gref_arr == NULL || pa_arr == NULL) {
 393                 RTE_LOG(ERR, PMD, "%s: calloc failed\n", __func__);
 394                 goto out;
 395         }
 396
 397         va  = gntalloc(size, gref_arr, &start_index);
 398         if (va == NULL) {
 399                 RTE_LOG(ERR, PMD, "%s: gntalloc failed\n", __func__);
 400                 goto out;
 401         }
 402
 403         if (get_phys_map(va, pa_arr, pg_num, pg_size))
 404                 goto out;
 405
 406         /* write in xenstore gref and pfn for each page of vring */
 407         if (grant_node_create(pg_num, gref_arr, pa_arr, val_str, sizeof(val_str))) {
 408                 gntfree(va, size, start_index);
 409                 va = NULL;
 410                 goto out;
 411         }
 412
 413         if (queue_type == VTNET_RQ)
 414                 rv = snprintf(key_str, sizeof(key_str), DPDK_XENSTORE_PATH"%d"RXVRING_XENSTORE_STR, vtidx);
 415         else
 416                 rv = snprintf(key_str, sizeof(key_str), DPDK_XENSTORE_PATH"%d"TXVRING_XENSTORE_STR, vtidx);
 417         if (rv == -1 || xenstore_write(key_str, val_str) == -1) {
 418                 gntfree(va, size, start_index);
 419                 va = NULL;
 420         }
 421 out:
 422         free(pa_arr);
 423         free(gref_arr);
 424
 425         return va;
 426 }
 427
 428
 429
 430 static struct virtqueue *
 431 virtio_queue_setup(struct rte_eth_dev *dev, int queue_type)
 432 {
 433         struct virtqueue *vq = NULL;
 434         uint16_t vq_size = VQ_DESC_NUM;
 435         int i = 0;
 436         char vq_name[VIRTQUEUE_MAX_NAME_SZ];
 437         size_t size;
 438         struct vring *vr;
 439
 440         /* Allocate memory for virtqueue. */
 441         if (queue_type == VTNET_RQ) {
 442                 snprintf(vq_name, sizeof(vq_name), "port%d_rvq",
 443                                 dev->data->port_id);
 444                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 445                         vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
 446                 if (vq == NULL) {
 447                         RTE_LOG(ERR, PMD, "%s: unabled to allocate virtqueue\n", __func__);
 448                         return NULL;
 449                 }
 450                 memcpy(vq->vq_name, vq_name, sizeof(vq->vq_name));
 451         } else if(queue_type == VTNET_TQ) {
 452                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq",
 453                         dev->data->port_id);
 454                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 455                         vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
 456                 if (vq == NULL) {
 457                         RTE_LOG(ERR, PMD, "%s: unabled to allocate virtqueue\n", __func__);
 458                         return NULL;
 459                 }
 460                 memcpy(vq->vq_name, vq_name, sizeof(vq->vq_name));
 461         }
 462
 463         memcpy(vq->vq_name, vq_name, sizeof(vq->vq_name));
 464
 465         vq->vq_alignment = VIRTIO_PCI_VRING_ALIGN;
 466         vq->vq_nentries = vq_size;
 467         vq->vq_free_cnt = vq_size;
 468         /* Calcuate vring size according to virtio spec */
 469         size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
 470         vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
 471         /* Allocate memory for virtio vring through gntalloc driver*/
 472         vq->vq_ring_virt_mem = gntalloc_vring_create(queue_type, vq->vq_ring_size,
 473                 ((struct pmd_internals *)dev->data->dev_private)->virtio_idx);
 474         memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
 475         vr = &vq->vq_ring;
 476         vring_init(vr, vq_size, vq->vq_ring_virt_mem, vq->vq_alignment);
 477         /*
 478          * Locally maintained last consumed index, this idex trails
 479          * vq_ring.used->idx.
 480          */
 481         vq->vq_used_cons_idx = 0;
 482         vq->vq_desc_head_idx = 0;
 483         vq->vq_free_cnt = vq->vq_nentries;
 484         memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
 485
 486         /* Chain all the descriptors in the ring with an END */
 487         for (i = 0; i < vq_size - 1; i++)
 488                 vr->desc[i].next = (uint16_t)(i + 1);
 489         vr->desc[i].next = VQ_RING_DESC_CHAIN_END;
 490
 491         return vq;
 492 }
 493
 494 static int
 495 eth_rx_queue_setup(struct rte_eth_dev *dev,uint16_t rx_queue_id,
 496                                 uint16_t nb_rx_desc __rte_unused,
 497                                 unsigned int socket_id __rte_unused,
 498                                 const struct rte_eth_rxconf *rx_conf __rte_unused,
 499                                 struct rte_mempool *mb_pool)
 500 {
 501         struct virtqueue *vq;
 502         vq = dev->data->rx_queues[rx_queue_id] = virtio_queue_setup(dev, VTNET_RQ);
 503         vq->mpool = mb_pool;
 504         return 0;
 505 }
 506
 507 static int
 508 eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 509                                 uint16_t nb_tx_desc __rte_unused,
 510                                 unsigned int socket_id __rte_unused,
 511                                 const struct rte_eth_txconf *tx_conf __rte_unused)
 512 {
 513         dev->data->tx_queues[tx_queue_id] = virtio_queue_setup(dev, VTNET_TQ);
 514         return 0;
 515 }
 516
 517 static void
 518 eth_xenvirt_free_queues(struct rte_eth_dev *dev)
 519 {
 520         int i;
 521
 522         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 523                 eth_queue_release(dev->data->rx_queues[i]);
 524                 dev->data->rx_queues[i] = NULL;
 525         }
 526         dev->data->nb_rx_queues = 0;
 527
 528         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 529                 eth_queue_release(dev->data->tx_queues[i]);
 530                 dev->data->tx_queues[i] = NULL;
 531         }
 532         dev->data->nb_tx_queues = 0;
 533 }
 534
 535 static const struct eth_dev_ops ops = {
 536         .dev_start = eth_dev_start,
 537         .dev_stop = eth_dev_stop,
 538         .dev_close = eth_dev_close,
 539         .dev_configure = eth_dev_configure,
 540         .dev_infos_get = eth_dev_info,
 541         .rx_queue_setup = eth_rx_queue_setup,
 542         .tx_queue_setup = eth_tx_queue_setup,
 543         .rx_queue_release = eth_queue_release,
 544         .tx_queue_release = eth_queue_release,
 545         .link_update = eth_link_update,
 546         .stats_get = eth_stats_get,
 547         .stats_reset = eth_stats_reset,
 548 };
 549
 550
 551 static int
 552 rte_eth_xenvirt_parse_args(struct xenvirt_dict *dict,
 553                         const char *name, const char *params)
 554 {
 555         int i;
 556         char *pairs[RTE_ETH_XENVIRT_MAX_ARGS];
 557         int num_of_pairs;
 558         char *pair[2];
 559         char *args;
 560         int ret = -1;
 561
 562         if (params == NULL)
 563                 return 0;
 564
 565         args = rte_zmalloc(NULL, strlen(params) + 1, RTE_CACHE_LINE_SIZE);
 566         if (args == NULL) {
 567                 RTE_LOG(ERR, PMD, "Couldn't parse %s device \n", name);
 568                 return -1;
 569         }
 570         rte_memcpy(args, params, strlen(params));
 571
 572         num_of_pairs = rte_strsplit(args, strnlen(args, MAX_ARG_STRLEN),
 573                                         pairs,
 574                                         RTE_ETH_XENVIRT_MAX_ARGS ,
 575                                         RTE_ETH_XENVIRT_PAIRS_DELIM);
 576
 577         for (i = 0; i < num_of_pairs; i++) {
 578                 pair[0] = NULL;
 579                 pair[1] = NULL;
 580                 rte_strsplit(pairs[i], strnlen(pairs[i], MAX_ARG_STRLEN),
 581                                         pair, 2,
 582                                         RTE_ETH_XENVIRT_KEY_VALUE_DELIM);
 583
 584                 if (pair[0] == NULL || pair[1] == NULL || pair[0][0] == 0
 585                         || pair[1][0] == 0) {
 586                         RTE_LOG(ERR, PMD,
 587                                 "Couldn't parse %s device,"
 588                                 "wrong key or value \n", name);
 589                         goto err;
 590                 }
 591
 592                 if (!strncmp(pair[0], RTE_ETH_XENVIRT_MAC_PARAM,
 593                                 sizeof(RTE_ETH_XENVIRT_MAC_PARAM))) {
 594                         if (cmdline_parse_etheraddr(NULL,
 595                                                     pair[1],
 596                                                     &dict->addr,
 597                                                     sizeof(dict->addr)) < 0) {
 598                                 RTE_LOG(ERR, PMD,
 599                                         "Invalid %s device ether address\n",
 600                                         name);
 601                                 goto err;
 602                         }
 603
 604                         dict->addr_valid = 1;
 605                 }
 606         }
 607
 608         ret = 0;
 609 err:
 610         rte_free(args);
 611         return ret;
 612 }
 613
 614 enum dev_action {
 615         DEV_CREATE,
 616         DEV_ATTACH
 617 };
 618
 619 static struct rte_vdev_driver pmd_xenvirt_drv;
 620
 621 static int
 622 eth_dev_xenvirt_create(const char *name, const char *params,
 623                 const unsigned numa_node,
 624                 enum dev_action action)
 625 {
 626         struct rte_eth_dev_data *data = NULL;
 627         struct pmd_internals *internals = NULL;
 628         struct rte_eth_dev *eth_dev = NULL;
 629         struct xenvirt_dict dict;
 630
 631         memset(&dict, 0, sizeof(struct xenvirt_dict));
 632
 633         RTE_LOG(INFO, PMD, "Creating virtio rings backed ethdev on numa socket %u\n",
 634                         numa_node);
 635         RTE_SET_USED(action);
 636
 637         if (rte_eth_xenvirt_parse_args(&dict, name, params) < 0) {
 638                 RTE_LOG(ERR, PMD, "%s: Failed to parse ethdev parameters\n", __func__);
 639                 return -1;
 640         }
 641
 642         /* now do all data allocation - for eth_dev structure, dummy pci driver
 643          * and internal (private) data
 644          */
 645         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
 646         if (data == NULL)
 647                 goto err;
 648
 649         internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
 650         if (internals == NULL)
 651                 goto err;
 652
 653         /* reserve an ethdev entry */
 654         eth_dev = rte_eth_dev_allocate(name);
 655         if (eth_dev == NULL)
 656                 goto err;
 657
 658         data->dev_private = internals;
 659         data->port_id = eth_dev->data->port_id;
 660         data->nb_rx_queues = (uint16_t)1;
 661         data->nb_tx_queues = (uint16_t)1;
 662         data->dev_link = pmd_link;
 663         data->mac_addrs = rte_zmalloc("xen_virtio", ETHER_ADDR_LEN, 0);
 664
 665         if(dict.addr_valid)
 666                 memcpy(&data->mac_addrs->addr_bytes, &dict.addr, sizeof(struct ether_addr));
 667         else
 668                 eth_random_addr(&data->mac_addrs->addr_bytes[0]);
 669
 670         eth_dev->data = data;
 671         eth_dev->dev_ops = &ops;
 672
 673         eth_dev->data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 674         eth_dev->data->kdrv = RTE_KDRV_NONE;
 675         eth_dev->data->drv_name = pmd_xenvirt_drv.driver.name;
 676         eth_dev->driver = NULL;
 677         eth_dev->data->numa_node = numa_node;
 678
 679         eth_dev->rx_pkt_burst = eth_xenvirt_rx;
 680         eth_dev->tx_pkt_burst = eth_xenvirt_tx;
 681
 682         internals->virtio_idx = virtio_idx++;
 683         internals->port_id = eth_dev->data->port_id;
 684
 685         return 0;
 686
 687 err:
 688         rte_free(data);
 689         rte_free(internals);
 690
 691         return -1;
 692 }
 693
 694
 695 static int
 696 eth_dev_xenvirt_free(const char *name, const unsigned numa_node)
 697 {
 698         struct rte_eth_dev *eth_dev = NULL;
 699
 700         RTE_LOG(DEBUG, PMD,
 701                 "Free virtio rings backed ethdev on numa socket %u\n",
 702                 numa_node);
 703
 704         /* find an ethdev entry */
 705         eth_dev = rte_eth_dev_allocated(name);
 706         if (eth_dev == NULL)
 707                 return -1;
 708
 709         if (eth_dev->data->dev_started == 1) {
 710                 eth_dev_stop(eth_dev);
 711                 eth_dev_close(eth_dev);
 712         }
 713
 714         eth_dev->rx_pkt_burst = NULL;
 715         eth_dev->tx_pkt_burst = NULL;
 716         eth_dev->dev_ops = NULL;
 717
 718         rte_free(eth_dev->data);
 719         rte_free(eth_dev->data->dev_private);
 720         rte_free(eth_dev->data->mac_addrs);
 721
 722         virtio_idx--;
 723
 724         return 0;
 725 }
 726
 727 /*TODO: Support multiple process model */
 728 static int
 729 rte_pmd_xenvirt_probe(const char *name, const char *params)
 730 {
 731         if (virtio_idx == 0) {
 732                 if (xenstore_init() != 0) {
 733                         RTE_LOG(ERR, PMD, "%s: xenstore init failed\n", __func__);
 734                         return -1;
 735                 }
 736                 if (gntalloc_open() != 0) {
 737                         RTE_LOG(ERR, PMD, "%s: grant init failed\n", __func__);
 738                         return -1;
 739                 }
 740         }
 741         eth_dev_xenvirt_create(name, params, rte_socket_id(), DEV_CREATE);
 742         return 0;
 743 }
 744
 745 static int
 746 rte_pmd_xenvirt_remove(const char *name)
 747 {
 748         eth_dev_xenvirt_free(name, rte_socket_id());
 749
 750         if (virtio_idx == 0) {
 751                 if (xenstore_uninit() != 0)
 752                         RTE_LOG(ERR, PMD, "%s: xenstore uninit failed\n", __func__);
 753
 754                 gntalloc_close();
 755         }
 756         return 0;
 757 }
 758
 759 static struct rte_vdev_driver pmd_xenvirt_drv = {
 760         .probe = rte_pmd_xenvirt_probe,
 761         .remove = rte_pmd_xenvirt_remove,
 762 };
 763
 764 RTE_PMD_REGISTER_VDEV(net_xenvirt, pmd_xenvirt_drv);
 765 RTE_PMD_REGISTER_ALIAS(net_xenvirt, eth_xenvirt);
 766 RTE_PMD_REGISTER_PARAM_STRING(net_xenvirt,
 767         "mac=<mac addr>");