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34 #ifndef RTE_EXEC_ENV_LINUXAPP
35 #error "KNI is not supported"
41 #include <sys/ioctl.h>
43 #include <rte_spinlock.h>
44 #include <rte_string_fns.h>
45 #include <rte_ethdev.h>
46 #include <rte_malloc.h>
49 #include <rte_memzone.h>
50 #include <exec-env/rte_kni_common.h>
51 #include "rte_kni_fifo.h"
53 #define MAX_MBUF_BURST_NUM 32
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))
60 #define KNI_REQUEST_MBUF_NUM_MAX 32
62 #define KNI_MEM_CHECK(cond) do { if (cond) goto kni_fail; } while (0)
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 */
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 */
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 */
84 struct rte_kni_ops ops; /**< operations for request */
85 uint8_t in_use : 1; /**< kni in use */
89 KNI_REQ_NO_REGISTER = 0,
94 * KNI memzone pool slot
96 struct rte_kni_memzone_slot {
98 uint8_t in_use : 1; /**< slot in use */
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;
110 /* Free linked list */
111 struct rte_kni_memzone_slot *next; /**< Next slot link.list */
117 struct rte_kni_memzone_pool {
118 uint8_t initialized : 1; /**< Global KNI pool init flag */
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 */
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 */
130 static void kni_free_mbufs(struct rte_kni *kni);
131 static void kni_allocate_mbufs(struct rte_kni *kni);
133 static volatile int kni_fd = -1;
134 static struct rte_kni_memzone_pool kni_memzone_pool = {
138 static const struct rte_memzone *
139 kni_memzone_reserve(const char *name, size_t len, int socket_id,
142 const struct rte_memzone *mz = rte_memzone_lookup(name);
145 mz = rte_memzone_reserve(name, len, socket_id, flags);
151 static struct rte_kni_memzone_slot*
152 kni_memzone_pool_alloc(void)
154 struct rte_kni_memzone_slot *slot;
156 rte_spinlock_lock(&kni_memzone_pool.mutex);
158 if (!kni_memzone_pool.free) {
159 rte_spinlock_unlock(&kni_memzone_pool.mutex);
163 slot = kni_memzone_pool.free;
164 kni_memzone_pool.free = slot->next;
167 if (!kni_memzone_pool.free)
168 kni_memzone_pool.free_tail = NULL;
170 rte_spinlock_unlock(&kni_memzone_pool.mutex);
176 kni_memzone_pool_release(struct rte_kni_memzone_slot *slot)
178 rte_spinlock_lock(&kni_memzone_pool.mutex);
180 if (kni_memzone_pool.free)
181 kni_memzone_pool.free_tail->next = slot;
183 kni_memzone_pool.free = slot;
185 kni_memzone_pool.free_tail = slot;
189 rte_spinlock_unlock(&kni_memzone_pool.mutex);
193 /* Shall be called before any allocation happens */
195 rte_kni_init(unsigned int max_kni_ifaces)
198 struct rte_kni_memzone_slot *it;
199 const struct rte_memzone *mz;
201 char obj_name[OBJNAMSIZ];
202 char mz_name[RTE_MEMZONE_NAMESIZE];
204 if (max_kni_ifaces == 0) {
205 RTE_LOG(ERR, KNI, "Invalid number of max_kni_ifaces %d\n",
207 rte_panic("Unable to initialize KNI\n");
210 /* Check FD and open */
212 kni_fd = open("/dev/" KNI_DEVICE, O_RDWR);
214 rte_panic("Can not open /dev/%s\n", KNI_DEVICE);
217 /* Allocate slot objects */
218 kni_memzone_pool.slots = (struct rte_kni_memzone_slot *)
220 sizeof(struct rte_kni_memzone_slot) *
223 KNI_MEM_CHECK(kni_memzone_pool.slots == NULL);
225 /* Initialize general pool variables */
226 kni_memzone_pool.initialized = 1;
227 kni_memzone_pool.max_ifaces = max_kni_ifaces;
228 kni_memzone_pool.free = &kni_memzone_pool.slots[0];
229 rte_spinlock_init(&kni_memzone_pool.mutex);
231 /* Pre-allocate all memzones of all the slots; panic on error */
232 for (i = 0; i < max_kni_ifaces; i++) {
234 /* Recover current slot */
235 it = &kni_memzone_pool.slots[i];
238 /* Allocate KNI context */
239 snprintf(mz_name, RTE_MEMZONE_NAMESIZE, "KNI_INFO_%d", i);
240 mz = kni_memzone_reserve(mz_name, sizeof(struct rte_kni),
242 KNI_MEM_CHECK(mz == NULL);
246 snprintf(obj_name, OBJNAMSIZ, "kni_tx_%d", i);
247 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
249 KNI_MEM_CHECK(mz == NULL);
253 snprintf(obj_name, OBJNAMSIZ, "kni_rx_%d", i);
254 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
256 KNI_MEM_CHECK(mz == NULL);
260 snprintf(obj_name, OBJNAMSIZ, "kni_alloc_%d", i);
261 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
263 KNI_MEM_CHECK(mz == NULL);
267 snprintf(obj_name, OBJNAMSIZ, "kni_free_%d", i);
268 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
270 KNI_MEM_CHECK(mz == NULL);
274 snprintf(obj_name, OBJNAMSIZ, "kni_req_%d", i);
275 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
277 KNI_MEM_CHECK(mz == NULL);
281 snprintf(obj_name, OBJNAMSIZ, "kni_resp_%d", i);
282 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
284 KNI_MEM_CHECK(mz == NULL);
287 /* Req/Resp sync mem area */
288 snprintf(obj_name, OBJNAMSIZ, "kni_sync_%d", i);
289 mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
291 KNI_MEM_CHECK(mz == NULL);
292 it->m_sync_addr = mz;
294 if ((i+1) == max_kni_ifaces) {
296 kni_memzone_pool.free_tail = it;
298 it->next = &kni_memzone_pool.slots[i+1];
304 rte_panic("Unable to allocate memory for max_kni_ifaces:%d. Increase the amount of hugepages memory\n",
308 /* It is deprecated and just for backward compatibility */
310 rte_kni_create(uint8_t port_id,
312 struct rte_mempool *pktmbuf_pool,
313 struct rte_kni_ops *ops)
315 struct rte_kni_conf conf;
316 struct rte_eth_dev_info info;
318 memset(&info, 0, sizeof(info));
319 memset(&conf, 0, sizeof(conf));
320 rte_eth_dev_info_get(port_id, &info);
322 snprintf(conf.name, sizeof(conf.name), "vEth%u", port_id);
323 conf.addr = info.pci_dev->addr;
324 conf.id = info.pci_dev->id;
325 conf.group_id = (uint16_t)port_id;
326 conf.mbuf_size = mbuf_size;
328 /* Save the port id for request handling */
329 ops->port_id = port_id;
331 return rte_kni_alloc(pktmbuf_pool, &conf, ops);
335 rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
336 const struct rte_kni_conf *conf,
337 struct rte_kni_ops *ops)
340 struct rte_kni_device_info dev_info;
342 char intf_name[RTE_KNI_NAMESIZE];
343 char mz_name[RTE_MEMZONE_NAMESIZE];
344 const struct rte_memzone *mz;
345 struct rte_kni_memzone_slot *slot = NULL;
347 if (!pktmbuf_pool || !conf || !conf->name[0])
350 /* Check if KNI subsystem has been initialized */
351 if (kni_memzone_pool.initialized != 1) {
352 RTE_LOG(ERR, KNI, "KNI subsystem has not been initialized. Invoke rte_kni_init() first\n");
356 /* Get an available slot from the pool */
357 slot = kni_memzone_pool_alloc();
359 RTE_LOG(ERR, KNI, "Cannot allocate more KNI interfaces; increase the number of max_kni_ifaces(current %d) or release unusued ones.\n",
360 kni_memzone_pool.max_ifaces);
365 ctx = slot->m_ctx->addr;
366 snprintf(intf_name, RTE_KNI_NAMESIZE, "%s", conf->name);
369 RTE_LOG(ERR, KNI, "KNI %s is in use\n", ctx->name);
372 memset(ctx, 0, sizeof(struct rte_kni));
374 memcpy(&ctx->ops, ops, sizeof(struct rte_kni_ops));
376 memset(&dev_info, 0, sizeof(dev_info));
377 dev_info.bus = conf->addr.bus;
378 dev_info.devid = conf->addr.devid;
379 dev_info.function = conf->addr.function;
380 dev_info.vendor_id = conf->id.vendor_id;
381 dev_info.device_id = conf->id.device_id;
382 dev_info.core_id = conf->core_id;
383 dev_info.force_bind = conf->force_bind;
384 dev_info.group_id = conf->group_id;
385 dev_info.mbuf_size = conf->mbuf_size;
387 snprintf(ctx->name, RTE_KNI_NAMESIZE, "%s", intf_name);
388 snprintf(dev_info.name, RTE_KNI_NAMESIZE, "%s", intf_name);
390 RTE_LOG(INFO, KNI, "pci: %02x:%02x:%02x \t %02x:%02x\n",
391 dev_info.bus, dev_info.devid, dev_info.function,
392 dev_info.vendor_id, dev_info.device_id);
395 ctx->tx_q = mz->addr;
396 kni_fifo_init(ctx->tx_q, KNI_FIFO_COUNT_MAX);
397 dev_info.tx_phys = mz->phys_addr;
401 ctx->rx_q = mz->addr;
402 kni_fifo_init(ctx->rx_q, KNI_FIFO_COUNT_MAX);
403 dev_info.rx_phys = mz->phys_addr;
406 mz = slot->m_alloc_q;
407 ctx->alloc_q = mz->addr;
408 kni_fifo_init(ctx->alloc_q, KNI_FIFO_COUNT_MAX);
409 dev_info.alloc_phys = mz->phys_addr;
413 ctx->free_q = mz->addr;
414 kni_fifo_init(ctx->free_q, KNI_FIFO_COUNT_MAX);
415 dev_info.free_phys = mz->phys_addr;
419 ctx->req_q = mz->addr;
420 kni_fifo_init(ctx->req_q, KNI_FIFO_COUNT_MAX);
421 dev_info.req_phys = mz->phys_addr;
425 ctx->resp_q = mz->addr;
426 kni_fifo_init(ctx->resp_q, KNI_FIFO_COUNT_MAX);
427 dev_info.resp_phys = mz->phys_addr;
429 /* Req/Resp sync mem area */
430 mz = slot->m_sync_addr;
431 ctx->sync_addr = mz->addr;
432 dev_info.sync_va = mz->addr;
433 dev_info.sync_phys = mz->phys_addr;
437 snprintf(mz_name, sizeof(mz_name), RTE_MEMPOOL_OBJ_NAME,
439 mz = rte_memzone_lookup(mz_name);
440 KNI_MEM_CHECK(mz == NULL);
441 dev_info.mbuf_va = mz->addr;
442 dev_info.mbuf_phys = mz->phys_addr;
443 ctx->pktmbuf_pool = pktmbuf_pool;
444 ctx->group_id = conf->group_id;
445 ctx->slot_id = slot->id;
446 ctx->mbuf_size = conf->mbuf_size;
448 ret = ioctl(kni_fd, RTE_KNI_IOCTL_CREATE, &dev_info);
449 KNI_MEM_CHECK(ret < 0);
457 kni_memzone_pool_release(&kni_memzone_pool.slots[slot->id]);
463 kni_free_fifo(struct rte_kni_fifo *fifo)
466 struct rte_mbuf *pkt;
469 ret = kni_fifo_get(fifo, (void **)&pkt, 1);
471 rte_pktmbuf_free(pkt);
476 rte_kni_release(struct rte_kni *kni)
478 struct rte_kni_device_info dev_info;
481 if (!kni || !kni->in_use)
484 snprintf(dev_info.name, sizeof(dev_info.name), "%s", kni->name);
485 if (ioctl(kni_fd, RTE_KNI_IOCTL_RELEASE, &dev_info) < 0) {
486 RTE_LOG(ERR, KNI, "Fail to release kni device\n");
490 /* mbufs in all fifo should be released, except request/response */
491 kni_free_fifo(kni->tx_q);
492 kni_free_fifo(kni->rx_q);
493 kni_free_fifo(kni->alloc_q);
494 kni_free_fifo(kni->free_q);
496 slot_id = kni->slot_id;
498 /* Memset the KNI struct */
499 memset(kni, 0, sizeof(struct rte_kni));
501 /* Release memzone */
502 if (slot_id > kni_memzone_pool.max_ifaces) {
503 rte_panic("KNI pool: corrupted slot ID: %d, max: %d\n",
504 slot_id, kni_memzone_pool.max_ifaces);
506 kni_memzone_pool_release(&kni_memzone_pool.slots[slot_id]);
512 rte_kni_handle_request(struct rte_kni *kni)
515 struct rte_kni_request *req;
520 /* Get request mbuf */
521 ret = kni_fifo_get(kni->req_q, (void **)&req, 1);
523 return 0; /* It is OK of can not getting the request mbuf */
525 if (req != kni->sync_addr) {
526 rte_panic("Wrong req pointer %p\n", req);
529 /* Analyze the request and call the relevant actions for it */
530 switch (req->req_id) {
531 case RTE_KNI_REQ_CHANGE_MTU: /* Change MTU */
532 if (kni->ops.change_mtu)
533 req->result = kni->ops.change_mtu(kni->ops.port_id,
536 case RTE_KNI_REQ_CFG_NETWORK_IF: /* Set network interface up/down */
537 if (kni->ops.config_network_if)
538 req->result = kni->ops.config_network_if(\
539 kni->ops.port_id, req->if_up);
542 RTE_LOG(ERR, KNI, "Unknown request id %u\n", req->req_id);
543 req->result = -EINVAL;
547 /* Construct response mbuf and put it back to resp_q */
548 ret = kni_fifo_put(kni->resp_q, (void **)&req, 1);
550 RTE_LOG(ERR, KNI, "Fail to put the muf back to resp_q\n");
551 return -1; /* It is an error of can't putting the mbuf back */
558 rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned num)
560 unsigned ret = kni_fifo_put(kni->rx_q, (void **)mbufs, num);
562 /* Get mbufs from free_q and then free them */
569 rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned num)
571 unsigned ret = kni_fifo_get(kni->tx_q, (void **)mbufs, num);
573 /* Allocate mbufs and then put them into alloc_q */
574 kni_allocate_mbufs(kni);
580 kni_free_mbufs(struct rte_kni *kni)
583 struct rte_mbuf *pkts[MAX_MBUF_BURST_NUM];
585 ret = kni_fifo_get(kni->free_q, (void **)pkts, MAX_MBUF_BURST_NUM);
586 if (likely(ret > 0)) {
587 for (i = 0; i < ret; i++)
588 rte_pktmbuf_free(pkts[i]);
593 kni_allocate_mbufs(struct rte_kni *kni)
596 struct rte_mbuf *pkts[MAX_MBUF_BURST_NUM];
598 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pool) !=
599 offsetof(struct rte_kni_mbuf, pool));
600 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, buf_addr) !=
601 offsetof(struct rte_kni_mbuf, buf_addr));
602 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, next) !=
603 offsetof(struct rte_kni_mbuf, next));
604 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_off) !=
605 offsetof(struct rte_kni_mbuf, data_off));
606 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) !=
607 offsetof(struct rte_kni_mbuf, data_len));
608 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) !=
609 offsetof(struct rte_kni_mbuf, pkt_len));
610 RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, ol_flags) !=
611 offsetof(struct rte_kni_mbuf, ol_flags));
613 /* Check if pktmbuf pool has been configured */
614 if (kni->pktmbuf_pool == NULL) {
615 RTE_LOG(ERR, KNI, "No valid mempool for allocating mbufs\n");
619 for (i = 0; i < MAX_MBUF_BURST_NUM; i++) {
620 pkts[i] = rte_pktmbuf_alloc(kni->pktmbuf_pool);
621 if (unlikely(pkts[i] == NULL)) {
623 RTE_LOG(ERR, KNI, "Out of memory\n");
628 /* No pkt mbuf alocated */
632 ret = kni_fifo_put(kni->alloc_q, (void **)pkts, i);
634 /* Check if any mbufs not put into alloc_q, and then free them */
635 if (ret >= 0 && ret < i && ret < MAX_MBUF_BURST_NUM) {
638 for (j = ret; j < i; j++)
639 rte_pktmbuf_free(pkts[j]);
643 /* It is deprecated and just for backward compatibility */
645 rte_kni_get_port_id(struct rte_kni *kni)
650 return kni->ops.port_id;
654 rte_kni_get(const char *name)
657 struct rte_kni_memzone_slot *it;
660 /* Note: could be improved perf-wise if necessary */
661 for (i = 0; i < kni_memzone_pool.max_ifaces; i++) {
662 it = &kni_memzone_pool.slots[i];
665 kni = it->m_ctx->addr;
666 if (strncmp(kni->name, name, RTE_KNI_NAMESIZE) == 0)
674 * It is deprecated and just for backward compatibility.
677 rte_kni_info_get(uint8_t port_id)
679 char name[RTE_MEMZONE_NAMESIZE];
681 if (port_id >= RTE_MAX_ETHPORTS)
684 snprintf(name, RTE_MEMZONE_NAMESIZE, "vEth%u", port_id);
686 return rte_kni_get(name);
689 static enum kni_ops_status
690 kni_check_request_register(struct rte_kni_ops *ops)
692 /* check if KNI request ops has been registered*/
694 return KNI_REQ_NO_REGISTER;
696 if((NULL == ops->change_mtu) && (NULL == ops->config_network_if))
697 return KNI_REQ_NO_REGISTER;
699 return KNI_REQ_REGISTERED;
703 rte_kni_register_handlers(struct rte_kni *kni,struct rte_kni_ops *ops)
705 enum kni_ops_status req_status;
708 RTE_LOG(ERR, KNI, "Invalid KNI request operation.\n");
713 RTE_LOG(ERR, KNI, "Invalid kni info.\n");
717 req_status = kni_check_request_register(&kni->ops);
718 if ( KNI_REQ_REGISTERED == req_status) {
719 RTE_LOG(ERR, KNI, "The KNI request operation has already registered.\n");
723 memcpy(&kni->ops, ops, sizeof(struct rte_kni_ops));
728 rte_kni_unregister_handlers(struct rte_kni *kni)
731 RTE_LOG(ERR, KNI, "Invalid kni info.\n");
735 kni->ops.change_mtu = NULL;
736 kni->ops.config_network_if = NULL;