ceph/src/dpdk/lib/librte_kni/rte_kni.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 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 #ifndef RTE_EXEC_ENV_LINUXAPP
  35 #error "KNI is not supported"
  36 #endif
  37
  38 #include <string.h>
  39 #include <fcntl.h>
  40 #include <unistd.h>
  41 #include <sys/ioctl.h>
  42
  43 #include <rte_spinlock.h>
  44 #include <rte_string_fns.h>
  45 #include <rte_ethdev.h>
  46 #include <rte_malloc.h>
  47 #include <rte_log.h>
  48 #include <rte_kni.h>
  49 #include <rte_memzone.h>
  50 #include <exec-env/rte_kni_common.h>
  51 #include "rte_kni_fifo.h"
  52
  53 #define MAX_MBUF_BURST_NUM            32
  54
  55 /* Maximum number of ring entries */
  56 #define KNI_FIFO_COUNT_MAX     1024
  57 #define KNI_FIFO_SIZE          (KNI_FIFO_COUNT_MAX * sizeof(void *) + \
  58                                         sizeof(struct rte_kni_fifo))
  59
  60 #define KNI_REQUEST_MBUF_NUM_MAX      32
  61
  62 #define KNI_MEM_CHECK(cond) do { if (cond) goto kni_fail; } while (0)
  63
  64 /**
  65  * KNI context
  66  */
  67 struct rte_kni {
  68         char name[RTE_KNI_NAMESIZE];        /**< KNI interface name */
  69         uint16_t group_id;                  /**< Group ID of KNI devices */
  70         uint32_t slot_id;                   /**< KNI pool slot ID */
  71         struct rte_mempool *pktmbuf_pool;   /**< pkt mbuf mempool */
  72         unsigned mbuf_size;                 /**< mbuf size */
  73
  74         struct rte_kni_fifo *tx_q;          /**< TX queue */
  75         struct rte_kni_fifo *rx_q;          /**< RX queue */
  76         struct rte_kni_fifo *alloc_q;       /**< Allocated mbufs queue */
  77         struct rte_kni_fifo *free_q;        /**< To be freed mbufs queue */
  78
  79         /* For request & response */
  80         struct rte_kni_fifo *req_q;         /**< Request queue */
  81         struct rte_kni_fifo *resp_q;        /**< Response queue */
  82         void * sync_addr;                   /**< Req/Resp Mem address */
  83
  84         struct rte_kni_ops ops;             /**< operations for request */
  85         uint8_t in_use : 1;                 /**< kni in use */
  86 };
  87
  88 enum kni_ops_status {
  89         KNI_REQ_NO_REGISTER = 0,
  90         KNI_REQ_REGISTERED,
  91 };
  92
  93 /**
  94  * KNI memzone pool slot
  95  */
  96 struct rte_kni_memzone_slot {
  97         uint32_t id;
  98         uint8_t in_use : 1;                    /**< slot in use */
  99
 100         /* Memzones */
 101         const struct rte_memzone *m_ctx;       /**< KNI ctx */
 102         const struct rte_memzone *m_tx_q;      /**< TX queue */
 103         const struct rte_memzone *m_rx_q;      /**< RX queue */
 104         const struct rte_memzone *m_alloc_q;   /**< Allocated mbufs queue */
 105         const struct rte_memzone *m_free_q;    /**< To be freed mbufs queue */
 106         const struct rte_memzone *m_req_q;     /**< Request queue */
 107         const struct rte_memzone *m_resp_q;    /**< Response queue */
 108         const struct rte_memzone *m_sync_addr;
 109
 110         /* Free linked list */
 111         struct rte_kni_memzone_slot *next;     /**< Next slot link.list */
 112 };
 113
 114 /**
 115  * KNI memzone pool
 116  */
 117 struct rte_kni_memzone_pool {
 118         uint8_t initialized : 1;            /**< Global KNI pool init flag */
 119
 120         uint32_t max_ifaces;                /**< Max. num of KNI ifaces */
 121         struct rte_kni_memzone_slot *slots;        /**< Pool slots */
 122         rte_spinlock_t mutex;               /**< alloc/relase mutex */
 123
 124         /* Free memzone slots linked-list */
 125         struct rte_kni_memzone_slot *free;         /**< First empty slot */
 126         struct rte_kni_memzone_slot *free_tail;    /**< Last empty slot */
 127 };
 128
 129
 130 static void kni_free_mbufs(struct rte_kni *kni);
 131 static void kni_allocate_mbufs(struct rte_kni *kni);
 132
 133 static volatile int kni_fd = -1;
 134 static struct rte_kni_memzone_pool kni_memzone_pool = {
 135         .initialized = 0,
 136 };
 137
 138 static const struct rte_memzone *
 139 kni_memzone_reserve(const char *name, size_t len, int socket_id,
 140                                                 unsigned flags)
 141 {
 142         const struct rte_memzone *mz = rte_memzone_lookup(name);
 143
 144         if (mz == NULL)
 145                 mz = rte_memzone_reserve(name, len, socket_id, flags);
 146
 147         return mz;
 148 }
 149
 150 /* Pool mgmt */
 151 static struct rte_kni_memzone_slot*
 152 kni_memzone_pool_alloc(void)
 153 {
 154         struct rte_kni_memzone_slot *slot;
 155
 156         rte_spinlock_lock(&kni_memzone_pool.mutex);
 157
 158         if (!kni_memzone_pool.free) {
 159                 rte_spinlock_unlock(&kni_memzone_pool.mutex);
 160                 return NULL;
 161         }
 162
 163         slot = kni_memzone_pool.free;
 164         kni_memzone_pool.free = slot->next;
 165         slot->in_use = 1;
 166
 167         if (!kni_memzone_pool.free)
 168                 kni_memzone_pool.free_tail = NULL;
 169
 170         rte_spinlock_unlock(&kni_memzone_pool.mutex);
 171
 172         return slot;
 173 }
 174
 175 static void
 176 kni_memzone_pool_release(struct rte_kni_memzone_slot *slot)
 177 {
 178         rte_spinlock_lock(&kni_memzone_pool.mutex);
 179
 180         if (kni_memzone_pool.free)
 181                 kni_memzone_pool.free_tail->next = slot;
 182         else
 183                 kni_memzone_pool.free = slot;
 184
 185         kni_memzone_pool.free_tail = slot;
 186         slot->next = NULL;
 187         slot->in_use = 0;
 188
 189         rte_spinlock_unlock(&kni_memzone_pool.mutex);
 190 }
 191
 192
 193 /* Shall be called before any allocation happens */
 194 void
 195 rte_kni_init(unsigned int max_kni_ifaces)
 196 {
 197         uint32_t i;
 198         struct rte_kni_memzone_slot *it;
 199         const struct rte_memzone *mz;
 200 #define OBJNAMSIZ 32
 201         char obj_name[OBJNAMSIZ];
 202         char mz_name[RTE_MEMZONE_NAMESIZE];
 203
 204         /* Immediately return if KNI is already initialized */
 205         if (kni_memzone_pool.initialized) {
 206                 RTE_LOG(WARNING, KNI, "Double call to rte_kni_init()");
 207                 return;
 208         }
 209
 210         if (max_kni_ifaces == 0) {
 211                 RTE_LOG(ERR, KNI, "Invalid number of max_kni_ifaces %d\n",
 212                                                         max_kni_ifaces);
 213                 RTE_LOG(ERR, KNI, "Unable to initialize KNI\n");
 214                 return;
 215         }
 216
 217         /* Check FD and open */
 218         if (kni_fd < 0) {
 219                 kni_fd = open("/dev/" KNI_DEVICE, O_RDWR);
 220                 if (kni_fd < 0) {
 221                         RTE_LOG(ERR, KNI,
 222                                 "Can not open /dev/%s\n", KNI_DEVICE);
 223                         return;
 224                 }
 225         }
 226
 227         /* Allocate slot objects */
 228         kni_memzone_pool.slots = (struct rte_kni_memzone_slot *)
 229                                         rte_malloc(NULL,
 230                                         sizeof(struct rte_kni_memzone_slot) *
 231                                         max_kni_ifaces,
 232                                         0);
 233         KNI_MEM_CHECK(kni_memzone_pool.slots == NULL);
 234
 235         /* Initialize general pool variables */
 236         kni_memzone_pool.initialized = 1;
 237         kni_memzone_pool.max_ifaces = max_kni_ifaces;
 238         kni_memzone_pool.free = &kni_memzone_pool.slots[0];
 239         rte_spinlock_init(&kni_memzone_pool.mutex);
 240
 241         /* Pre-allocate all memzones of all the slots; panic on error */
 242         for (i = 0; i < max_kni_ifaces; i++) {
 243
 244                 /* Recover current slot */
 245                 it = &kni_memzone_pool.slots[i];
 246                 it->id = i;
 247
 248                 /* Allocate KNI context */
 249                 snprintf(mz_name, RTE_MEMZONE_NAMESIZE, "KNI_INFO_%d", i);
 250                 mz = kni_memzone_reserve(mz_name, sizeof(struct rte_kni),
 251                                         SOCKET_ID_ANY, 0);
 252                 KNI_MEM_CHECK(mz == NULL);
 253                 it->m_ctx = mz;
 254
 255                 /* TX RING */
 256                 snprintf(obj_name, OBJNAMSIZ, "kni_tx_%d", i);
 257                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 258                                                         SOCKET_ID_ANY, 0);
 259                 KNI_MEM_CHECK(mz == NULL);
 260                 it->m_tx_q = mz;
 261
 262                 /* RX RING */
 263                 snprintf(obj_name, OBJNAMSIZ, "kni_rx_%d", i);
 264                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 265                                                         SOCKET_ID_ANY, 0);
 266                 KNI_MEM_CHECK(mz == NULL);
 267                 it->m_rx_q = mz;
 268
 269                 /* ALLOC RING */
 270                 snprintf(obj_name, OBJNAMSIZ, "kni_alloc_%d", i);
 271                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 272                                                         SOCKET_ID_ANY, 0);
 273                 KNI_MEM_CHECK(mz == NULL);
 274                 it->m_alloc_q = mz;
 275
 276                 /* FREE RING */
 277                 snprintf(obj_name, OBJNAMSIZ, "kni_free_%d", i);
 278                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 279                                                         SOCKET_ID_ANY, 0);
 280                 KNI_MEM_CHECK(mz == NULL);
 281                 it->m_free_q = mz;
 282
 283                 /* Request RING */
 284                 snprintf(obj_name, OBJNAMSIZ, "kni_req_%d", i);
 285                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 286                                                         SOCKET_ID_ANY, 0);
 287                 KNI_MEM_CHECK(mz == NULL);
 288                 it->m_req_q = mz;
 289
 290                 /* Response RING */
 291                 snprintf(obj_name, OBJNAMSIZ, "kni_resp_%d", i);
 292                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 293                                                         SOCKET_ID_ANY, 0);
 294                 KNI_MEM_CHECK(mz == NULL);
 295                 it->m_resp_q = mz;
 296
 297                 /* Req/Resp sync mem area */
 298                 snprintf(obj_name, OBJNAMSIZ, "kni_sync_%d", i);
 299                 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
 300                                                         SOCKET_ID_ANY, 0);
 301                 KNI_MEM_CHECK(mz == NULL);
 302                 it->m_sync_addr = mz;
 303
 304                 if ((i+1) == max_kni_ifaces) {
 305                         it->next = NULL;
 306                         kni_memzone_pool.free_tail = it;
 307                 } else
 308                         it->next = &kni_memzone_pool.slots[i+1];
 309         }
 310
 311         return;
 312
 313 kni_fail:
 314         RTE_LOG(ERR, KNI, "Unable to allocate memory for max_kni_ifaces:%d."
 315                 "Increase the amount of hugepages memory\n", max_kni_ifaces);
 316 }
 317
 318
 319 struct rte_kni *
 320 rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
 321               const struct rte_kni_conf *conf,
 322               struct rte_kni_ops *ops)
 323 {
 324         int ret;
 325         struct rte_kni_device_info dev_info;
 326         struct rte_kni *ctx;
 327         char intf_name[RTE_KNI_NAMESIZE];
 328         const struct rte_memzone *mz;
 329         struct rte_kni_memzone_slot *slot = NULL;
 330
 331         if (!pktmbuf_pool || !conf || !conf->name[0])
 332                 return NULL;
 333
 334         /* Check if KNI subsystem has been initialized */
 335         if (kni_memzone_pool.initialized != 1) {
 336                 RTE_LOG(ERR, KNI, "KNI subsystem has not been initialized. Invoke rte_kni_init() first\n");
 337                 return NULL;
 338         }
 339
 340         /* Get an available slot from the pool */
 341         slot = kni_memzone_pool_alloc();
 342         if (!slot) {
 343                 RTE_LOG(ERR, KNI, "Cannot allocate more KNI interfaces; increase the number of max_kni_ifaces(current %d) or release unusued ones.\n",
 344                         kni_memzone_pool.max_ifaces);
 345                 return NULL;
 346         }
 347
 348         /* Recover ctx */
 349         ctx = slot->m_ctx->addr;
 350         snprintf(intf_name, RTE_KNI_NAMESIZE, "%s", conf->name);
 351
 352         if (ctx->in_use) {
 353                 RTE_LOG(ERR, KNI, "KNI %s is in use\n", ctx->name);
 354                 return NULL;
 355         }
 356         memset(ctx, 0, sizeof(struct rte_kni));
 357         if (ops)
 358                 memcpy(&ctx->ops, ops, sizeof(struct rte_kni_ops));
 359
 360         memset(&dev_info, 0, sizeof(dev_info));
 361         dev_info.bus = conf->addr.bus;
 362         dev_info.devid = conf->addr.devid;
 363         dev_info.function = conf->addr.function;
 364         dev_info.vendor_id = conf->id.vendor_id;
 365         dev_info.device_id = conf->id.device_id;
 366         dev_info.core_id = conf->core_id;
 367         dev_info.force_bind = conf->force_bind;
 368         dev_info.group_id = conf->group_id;
 369         dev_info.mbuf_size = conf->mbuf_size;
 370
 371         snprintf(ctx->name, RTE_KNI_NAMESIZE, "%s", intf_name);
 372         snprintf(dev_info.name, RTE_KNI_NAMESIZE, "%s", intf_name);
 373
 374         RTE_LOG(INFO, KNI, "pci: %02x:%02x:%02x \t %02x:%02x\n",
 375                 dev_info.bus, dev_info.devid, dev_info.function,
 376                         dev_info.vendor_id, dev_info.device_id);
 377         /* TX RING */
 378         mz = slot->m_tx_q;
 379         ctx->tx_q = mz->addr;
 380         kni_fifo_init(ctx->tx_q, KNI_FIFO_COUNT_MAX);
 381         dev_info.tx_phys = mz->phys_addr;
 382
 383         /* RX RING */
 384         mz = slot->m_rx_q;
 385         ctx->rx_q = mz->addr;
 386         kni_fifo_init(ctx->rx_q, KNI_FIFO_COUNT_MAX);
 387         dev_info.rx_phys = mz->phys_addr;
 388
 389         /* ALLOC RING */
 390         mz = slot->m_alloc_q;
 391         ctx->alloc_q = mz->addr;
 392         kni_fifo_init(ctx->alloc_q, KNI_FIFO_COUNT_MAX);
 393         dev_info.alloc_phys = mz->phys_addr;
 394
 395         /* FREE RING */
 396         mz = slot->m_free_q;
 397         ctx->free_q = mz->addr;
 398         kni_fifo_init(ctx->free_q, KNI_FIFO_COUNT_MAX);
 399         dev_info.free_phys = mz->phys_addr;
 400
 401         /* Request RING */
 402         mz = slot->m_req_q;
 403         ctx->req_q = mz->addr;
 404         kni_fifo_init(ctx->req_q, KNI_FIFO_COUNT_MAX);
 405         dev_info.req_phys = mz->phys_addr;
 406
 407         /* Response RING */
 408         mz = slot->m_resp_q;
 409         ctx->resp_q = mz->addr;
 410         kni_fifo_init(ctx->resp_q, KNI_FIFO_COUNT_MAX);
 411         dev_info.resp_phys = mz->phys_addr;
 412
 413         /* Req/Resp sync mem area */
 414         mz = slot->m_sync_addr;
 415         ctx->sync_addr = mz->addr;
 416         dev_info.sync_va = mz->addr;
 417         dev_info.sync_phys = mz->phys_addr;
 418
 419         ctx->pktmbuf_pool = pktmbuf_pool;
 420         ctx->group_id = conf->group_id;
 421         ctx->slot_id = slot->id;
 422         ctx->mbuf_size = conf->mbuf_size;
 423
 424         ret = ioctl(kni_fd, RTE_KNI_IOCTL_CREATE, &dev_info);
 425         KNI_MEM_CHECK(ret < 0);
 426
 427         ctx->in_use = 1;
 428
 429         /* Allocate mbufs and then put them into alloc_q */
 430         kni_allocate_mbufs(ctx);
 431
 432         return ctx;
 433
 434 kni_fail:
 435         if (slot)
 436                 kni_memzone_pool_release(&kni_memzone_pool.slots[slot->id]);
 437
 438         return NULL;
 439 }
 440
 441 static void
 442 kni_free_fifo(struct rte_kni_fifo *fifo)
 443 {
 444         int ret;
 445         struct rte_mbuf *pkt;
 446
 447         do {
 448                 ret = kni_fifo_get(fifo, (void **)&pkt, 1);
 449                 if (ret)
 450                         rte_pktmbuf_free(pkt);
 451         } while (ret);
 452 }
 453
 454 static void
 455 kni_free_fifo_phy(struct rte_kni_fifo *fifo)
 456 {
 457         void *mbuf_phys;
 458         int ret;
 459
 460         do {
 461                 ret = kni_fifo_get(fifo, &mbuf_phys, 1);
 462                 /*
 463                  * TODO: free mbufs
 464                  */
 465         } while (ret);
 466 }
 467
 468 int
 469 rte_kni_release(struct rte_kni *kni)
 470 {
 471         struct rte_kni_device_info dev_info;
 472         uint32_t slot_id;
 473
 474         if (!kni || !kni->in_use)
 475                 return -1;
 476
 477         snprintf(dev_info.name, sizeof(dev_info.name), "%s", kni->name);
 478         if (ioctl(kni_fd, RTE_KNI_IOCTL_RELEASE, &dev_info) < 0) {
 479                 RTE_LOG(ERR, KNI, "Fail to release kni device\n");
 480                 return -1;
 481         }
 482
 483         /* mbufs in all fifo should be released, except request/response */
 484         kni_free_fifo(kni->tx_q);
 485         kni_free_fifo_phy(kni->rx_q);
 486         kni_free_fifo_phy(kni->alloc_q);
 487         kni_free_fifo(kni->free_q);
 488
 489         slot_id = kni->slot_id;
 490
 491         /* Memset the KNI struct */
 492         memset(kni, 0, sizeof(struct rte_kni));
 493
 494         /* Release memzone */
 495         if (slot_id > kni_memzone_pool.max_ifaces) {
 496                 RTE_LOG(ERR, KNI, "KNI pool: corrupted slot ID: %d, max: %d\n",
 497                         slot_id, kni_memzone_pool.max_ifaces);
 498                 return -1;
 499         }
 500         kni_memzone_pool_release(&kni_memzone_pool.slots[slot_id]);
 501
 502         return 0;
 503 }
 504
 505 int
 506 rte_kni_handle_request(struct rte_kni *kni)
 507 {
 508         unsigned ret;
 509         struct rte_kni_request *req;
 510
 511         if (kni == NULL)
 512                 return -1;
 513
 514         /* Get request mbuf */
 515         ret = kni_fifo_get(kni->req_q, (void **)&req, 1);
 516         if (ret != 1)
 517                 return 0; /* It is OK of can not getting the request mbuf */
 518
 519         if (req != kni->sync_addr) {
 520                 RTE_LOG(ERR, KNI, "Wrong req pointer %p\n", req);
 521                 return -1;
 522         }
 523
 524         /* Analyze the request and call the relevant actions for it */
 525         switch (req->req_id) {
 526         case RTE_KNI_REQ_CHANGE_MTU: /* Change MTU */
 527                 if (kni->ops.change_mtu)
 528                         req->result = kni->ops.change_mtu(kni->ops.port_id,
 529                                                         req->new_mtu);
 530                 break;
 531         case RTE_KNI_REQ_CFG_NETWORK_IF: /* Set network interface up/down */
 532                 if (kni->ops.config_network_if)
 533                         req->result = kni->ops.config_network_if(\
 534                                         kni->ops.port_id, req->if_up);
 535                 break;
 536         default:
 537                 RTE_LOG(ERR, KNI, "Unknown request id %u\n", req->req_id);
 538                 req->result = -EINVAL;
 539                 break;
 540         }
 541
 542         /* Construct response mbuf and put it back to resp_q */
 543         ret = kni_fifo_put(kni->resp_q, (void **)&req, 1);
 544         if (ret != 1) {
 545                 RTE_LOG(ERR, KNI, "Fail to put the muf back to resp_q\n");
 546                 return -1; /* It is an error of can't putting the mbuf back */
 547         }
 548
 549         return 0;
 550 }
 551
 552 static void *
 553 va2pa(struct rte_mbuf *m)
 554 {
 555         return (void *)((unsigned long)m -
 556                         ((unsigned long)m->buf_addr -
 557                          (unsigned long)m->buf_physaddr));
 558 }
 559
 560 unsigned
 561 rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned num)
 562 {
 563         void *phy_mbufs[num];
 564         unsigned int ret;
 565         unsigned int i;
 566
 567         for (i = 0; i < num; i++)
 568                 phy_mbufs[i] = va2pa(mbufs[i]);
 569
 570         ret = kni_fifo_put(kni->rx_q, phy_mbufs, num);
 571
 572         /* Get mbufs from free_q and then free them */
 573         kni_free_mbufs(kni);
 574
 575         return ret;
 576 }
 577
 578 unsigned
 579 rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned num)
 580 {
 581         unsigned ret = kni_fifo_get(kni->tx_q, (void **)mbufs, num);
 582
 583         /* If buffers removed, allocate mbufs and then put them into alloc_q */
 584         if (ret)
 585                 kni_allocate_mbufs(kni);
 586
 587         return ret;
 588 }
 589
 590 static void
 591 kni_free_mbufs(struct rte_kni *kni)
 592 {
 593         int i, ret;
 594         struct rte_mbuf *pkts[MAX_MBUF_BURST_NUM];
 595
 596         ret = kni_fifo_get(kni->free_q, (void **)pkts, MAX_MBUF_BURST_NUM);
 597         if (likely(ret > 0)) {
 598                 for (i = 0; i < ret; i++)
 599                         rte_pktmbuf_free(pkts[i]);
 600         }
 601 }
 602
 603 static void
 604 kni_allocate_mbufs(struct rte_kni *kni)
 605 {
 606         int i, ret;
 607         struct rte_mbuf *pkts[MAX_MBUF_BURST_NUM];
 608         void *phys[MAX_MBUF_BURST_NUM];
 609
 610         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pool) !=
 611                          offsetof(struct rte_kni_mbuf, pool));
 612         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, buf_addr) !=
 613                          offsetof(struct rte_kni_mbuf, buf_addr));
 614         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, next) !=
 615                          offsetof(struct rte_kni_mbuf, next));
 616         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_off) !=
 617                          offsetof(struct rte_kni_mbuf, data_off));
 618         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) !=
 619                          offsetof(struct rte_kni_mbuf, data_len));
 620         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) !=
 621                          offsetof(struct rte_kni_mbuf, pkt_len));
 622         RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, ol_flags) !=
 623                          offsetof(struct rte_kni_mbuf, ol_flags));
 624
 625         /* Check if pktmbuf pool has been configured */
 626         if (kni->pktmbuf_pool == NULL) {
 627                 RTE_LOG(ERR, KNI, "No valid mempool for allocating mbufs\n");
 628                 return;
 629         }
 630
 631         for (i = 0; i < MAX_MBUF_BURST_NUM; i++) {
 632                 pkts[i] = rte_pktmbuf_alloc(kni->pktmbuf_pool);
 633                 if (unlikely(pkts[i] == NULL)) {
 634                         /* Out of memory */
 635                         RTE_LOG(ERR, KNI, "Out of memory\n");
 636                         break;
 637                 }
 638                 phys[i] = va2pa(pkts[i]);
 639         }
 640
 641         /* No pkt mbuf alocated */
 642         if (i <= 0)
 643                 return;
 644
 645         ret = kni_fifo_put(kni->alloc_q, phys, i);
 646
 647         /* Check if any mbufs not put into alloc_q, and then free them */
 648         if (ret >= 0 && ret < i && ret < MAX_MBUF_BURST_NUM) {
 649                 int j;
 650
 651                 for (j = ret; j < i; j++)
 652                         rte_pktmbuf_free(pkts[j]);
 653         }
 654 }
 655
 656 struct rte_kni *
 657 rte_kni_get(const char *name)
 658 {
 659         uint32_t i;
 660         struct rte_kni_memzone_slot *it;
 661         struct rte_kni *kni;
 662
 663         /* Note: could be improved perf-wise if necessary */
 664         for (i = 0; i < kni_memzone_pool.max_ifaces; i++) {
 665                 it = &kni_memzone_pool.slots[i];
 666                 if (it->in_use == 0)
 667                         continue;
 668                 kni = it->m_ctx->addr;
 669                 if (strncmp(kni->name, name, RTE_KNI_NAMESIZE) == 0)
 670                         return kni;
 671         }
 672
 673         return NULL;
 674 }
 675
 676 const char *
 677 rte_kni_get_name(const struct rte_kni *kni)
 678 {
 679         return kni->name;
 680 }
 681
 682 static enum kni_ops_status
 683 kni_check_request_register(struct rte_kni_ops *ops)
 684 {
 685         /* check if KNI request ops has been registered*/
 686         if( NULL == ops )
 687                 return KNI_REQ_NO_REGISTER;
 688
 689         if((NULL == ops->change_mtu) && (NULL == ops->config_network_if))
 690                 return KNI_REQ_NO_REGISTER;
 691
 692         return KNI_REQ_REGISTERED;
 693 }
 694
 695 int
 696 rte_kni_register_handlers(struct rte_kni *kni,struct rte_kni_ops *ops)
 697 {
 698         enum kni_ops_status req_status;
 699
 700         if (NULL == ops) {
 701                 RTE_LOG(ERR, KNI, "Invalid KNI request operation.\n");
 702                 return -1;
 703         }
 704
 705         if (NULL == kni) {
 706                 RTE_LOG(ERR, KNI, "Invalid kni info.\n");
 707                 return -1;
 708         }
 709
 710         req_status = kni_check_request_register(&kni->ops);
 711         if ( KNI_REQ_REGISTERED == req_status) {
 712                 RTE_LOG(ERR, KNI, "The KNI request operation has already registered.\n");
 713                 return -1;
 714         }
 715
 716         memcpy(&kni->ops, ops, sizeof(struct rte_kni_ops));
 717         return 0;
 718 }
 719
 720 int
 721 rte_kni_unregister_handlers(struct rte_kni *kni)
 722 {
 723         if (NULL == kni) {
 724                 RTE_LOG(ERR, KNI, "Invalid kni info.\n");
 725                 return -1;
 726         }
 727
 728         kni->ops.change_mtu = NULL;
 729         kni->ops.config_network_if = NULL;
 730         return 0;
 731 }
 732 void
 733 rte_kni_close(void)
 734 {
 735         if (kni_fd < 0)
 736                 return;
 737
 738         close(kni_fd);
 739         kni_fd = -1;
 740 }