text: /*-
   *   BSD LICENSE
   *
   *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   *   All rights reserved.
   *
   *   Redistribution and use in source and binary forms, with or without
   *   modification, are permitted provided that the following conditions
   *   are met:
   *
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in
   *       the documentation and/or other materials provided with the
   *       distribution.
   *     * Neither the name of Intel Corporation nor the names of its
   *       contributors may be used to endorse or promote products derived
   *       from this software without specific prior written permission.
   *
   *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef RTE_EXEC_ENV_LINUXAPP
  #error "KNI is not supported"
  #endif
  
  #include <string.h>
  #include <fcntl.h>
  #include <unistd.h>
  #include <sys/ioctl.h>
  
  #include <rte_spinlock.h>
  #include <rte_string_fns.h>
  #include <rte_ethdev.h>
  #include <rte_malloc.h>
  #include <rte_log.h>
  #include <rte_kni.h>
  #include <rte_memzone.h>
  #include <exec-env/rte_kni_common.h>
  #include "rte_kni_fifo.h"
  
  #define MAX_MBUF_BURST_NUM            32
  
  /* Maximum number of ring entries */
  #define KNI_FIFO_COUNT_MAX     1024
  #define KNI_FIFO_SIZE          (KNI_FIFO_COUNT_MAX * sizeof(void *) + \
  					sizeof(struct rte_kni_fifo))
  
  #define KNI_REQUEST_MBUF_NUM_MAX      32
  
  #define KNI_MEM_CHECK(cond) do { if (cond) goto kni_fail; } while (0)
  
  /**
   * KNI context
   */
  struct rte_kni {
  	char name[RTE_KNI_NAMESIZE];        /**< KNI interface name */
  	uint16_t group_id;                  /**< Group ID of KNI devices */
  	uint32_t slot_id;                   /**< KNI pool slot ID */
  	struct rte_mempool *pktmbuf_pool;   /**< pkt mbuf mempool */
  	unsigned mbuf_size;                 /**< mbuf size */
  
  	struct rte_kni_fifo *tx_q;          /**< TX queue */
  	struct rte_kni_fifo *rx_q;          /**< RX queue */
  	struct rte_kni_fifo *alloc_q;       /**< Allocated mbufs queue */
  	struct rte_kni_fifo *free_q;        /**< To be freed mbufs queue */
  
  	/* For request & response */
  	struct rte_kni_fifo *req_q;         /**< Request queue */
  	struct rte_kni_fifo *resp_q;        /**< Response queue */
  	void * sync_addr;                   /**< Req/Resp Mem address */
  
  	struct rte_kni_ops ops;             /**< operations for request */
  	uint8_t in_use : 1;                 /**< kni in use */
  };
  
  enum kni_ops_status {
  	KNI_REQ_NO_REGISTER = 0,
  	KNI_REQ_REGISTERED,
  };
  
  /**
   * KNI memzone pool slot
   */
  struct rte_kni_memzone_slot {
  	uint32_t id;
  	uint8_t in_use : 1;                    /**< slot in use */
  
  	/* Memzones */
  	const struct rte_memzone *m_ctx;       /**< KNI ctx */
  	const struct rte_memzone *m_tx_q;      /**< TX queue */
  	const struct rte_memzone *m_rx_q;      /**< RX queue */
  	const struct rte_memzone *m_alloc_q;   /**< Allocated mbufs queue */
  	const struct rte_memzone *m_free_q;    /**< To be freed mbufs queue */
  	const struct rte_memzone *m_req_q;     /**< Request queue */
  	const struct rte_memzone *m_resp_q;    /**< Response queue */
  	const struct rte_memzone *m_sync_addr;
  
  	/* Free linked list */
  	struct rte_kni_memzone_slot *next;     /**< Next slot link.list */
  };
  
  /**
   * KNI memzone pool
   */
  struct rte_kni_memzone_pool {
  	uint8_t initialized : 1;            /**< Global KNI pool init flag */
  
  	uint32_t max_ifaces;                /**< Max. num of KNI ifaces */
  	struct rte_kni_memzone_slot *slots;        /**< Pool slots */
  	rte_spinlock_t mutex;               /**< alloc/relase mutex */
  
  	/* Free memzone slots linked-list */
  	struct rte_kni_memzone_slot *free;         /**< First empty slot */
  	struct rte_kni_memzone_slot *free_tail;    /**< Last empty slot */
  };
  
  
  static void kni_free_mbufs(struct rte_kni *kni);
  static void kni_allocate_mbufs(struct rte_kni *kni);
  
  static volatile int kni_fd = -1;
  static struct rte_kni_memzone_pool kni_memzone_pool = {
  	.initialized = 0,
  };
  
  static const struct rte_memzone *
  kni_memzone_reserve(const char *name, size_t len, int socket_id,
  						unsigned flags)
  {
  	const struct rte_memzone *mz = rte_memzone_lookup(name);
  
  	if (mz == NULL)
  		mz = rte_memzone_reserve(name, len, socket_id, flags);
  
  	return mz;
  }
  
  /* Pool mgmt */
  static struct rte_kni_memzone_slot*
  kni_memzone_pool_alloc(void)
  {
  	struct rte_kni_memzone_slot *slot;
  
  	rte_spinlock_lock(&kni_memzone_pool.mutex);
  
  	if (!kni_memzone_pool.free) {
  		rte_spinlock_unlock(&kni_memzone_pool.mutex);
  		return NULL;
  	}
  
  	slot = kni_memzone_pool.free;
  	kni_memzone_pool.free = slot->next;
  	slot->in_use = 1;
  
  	if (!kni_memzone_pool.free)
  		kni_memzone_pool.free_tail = NULL;
  
  	rte_spinlock_unlock(&kni_memzone_pool.mutex);
  
  	return slot;
  }
  
  static void
  kni_memzone_pool_release(struct rte_kni_memzone_slot *slot)
  {
  	rte_spinlock_lock(&kni_memzone_pool.mutex);
  
  	if (kni_memzone_pool.free)
  		kni_memzone_pool.free_tail->next = slot;
  	else
  		kni_memzone_pool.free = slot;
  
  	kni_memzone_pool.free_tail = slot;
  	slot->next = NULL;
  	slot->in_use = 0;
  
  	rte_spinlock_unlock(&kni_memzone_pool.mutex);
  }
  
  
  /* Shall be called before any allocation happens */
  void
  rte_kni_init(unsigned int max_kni_ifaces)
  {
  	uint32_t i;
  	struct rte_kni_memzone_slot *it;
  	const struct rte_memzone *mz;
  #define OBJNAMSIZ 32
  	char obj_name[OBJNAMSIZ];
  	char mz_name[RTE_MEMZONE_NAMESIZE];
  
  	/* Immediately return if KNI is already initialized */
  	if (kni_memzone_pool.initialized) {
  		RTE_LOG(WARNING, KNI, "Double call to rte_kni_init()");
  		return;
  	}
  
  	if (max_kni_ifaces == 0) {
  		RTE_LOG(ERR, KNI, "Invalid number of max_kni_ifaces %d\n",
  							max_kni_ifaces);
  		RTE_LOG(ERR, KNI, "Unable to initialize KNI\n");
  		return;
  	}
  
  	/* Check FD and open */
  	if (kni_fd < 0) {
  		kni_fd = open("/dev/" KNI_DEVICE, O_RDWR);
  		if (kni_fd < 0) {
  			RTE_LOG(ERR, KNI,
  				"Can not open /dev/%s\n", KNI_DEVICE);
  			return;
  		}
  	}
  
  	/* Allocate slot objects */
  	kni_memzone_pool.slots = (struct rte_kni_memzone_slot *)
  					rte_malloc(NULL,
  					sizeof(struct rte_kni_memzone_slot) *
  					max_kni_ifaces,
  					0);
  	KNI_MEM_CHECK(kni_memzone_pool.slots == NULL);
  
  	/* Initialize general pool variables */
  	kni_memzone_pool.initialized = 1;
  	kni_memzone_pool.max_ifaces = max_kni_ifaces;
  	kni_memzone_pool.free = &kni_memzone_pool.slots[0];
  	rte_spinlock_init(&kni_memzone_pool.mutex);
  
  	/* Pre-allocate all memzones of all the slots; panic on error */
  	for (i = 0; i < max_kni_ifaces; i++) {
  
  		/* Recover current slot */
  		it = &kni_memzone_pool.slots[i];
  		it->id = i;
  
  		/* Allocate KNI context */
  		snprintf(mz_name, RTE_MEMZONE_NAMESIZE, "KNI_INFO_%d", i);
  		mz = kni_memzone_reserve(mz_name, sizeof(struct rte_kni),
  					SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_ctx = mz;
  
  		/* TX RING */
  		snprintf(obj_name, OBJNAMSIZ, "kni_tx_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_tx_q = mz;
  
  		/* RX RING */
  		snprintf(obj_name, OBJNAMSIZ, "kni_rx_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_rx_q = mz;
  
  		/* ALLOC RING */
  		snprintf(obj_name, OBJNAMSIZ, "kni_alloc_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_alloc_q = mz;
  
  		/* FREE RING */
  		snprintf(obj_name, OBJNAMSIZ, "kni_free_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_free_q = mz;
  
  		/* Request RING */
  		snprintf(obj_name, OBJNAMSIZ, "kni_req_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_req_q = mz;
  
  		/* Response RING */
  		snprintf(obj_name, OBJNAMSIZ, "kni_resp_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_resp_q = mz;
  
  		/* Req/Resp sync mem area */
  		snprintf(obj_name, OBJNAMSIZ, "kni_sync_%d", i);
  		mz = kni_memzone_reserve(obj_name, KNI_FIFO_SIZE,
  							SOCKET_ID_ANY, 0);
  		KNI_MEM_CHECK(mz == NULL);
  		it->m_sync_addr = mz;
  
  		if ((i+1) == max_kni_ifaces) {
  			it->next = NULL;
  			kni_memzone_pool.free_tail = it;
  		} else
  			it->next = &kni_memzone_pool.slots[i+1];
  	}
  
  	return;
  
  kni_fail:
  	RTE_LOG(ERR, KNI, "Unable to allocate memory for max_kni_ifaces:%d."
  		"Increase the amount of hugepages memory\n", max_kni_ifaces);
  }
  
  
  struct rte_kni *
  rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
  	      const struct rte_kni_conf *conf,
  	      struct rte_kni_ops *ops)
  {
  	int ret;
  	struct rte_kni_device_info dev_info;
  	struct rte_kni *ctx;
  	char intf_name[RTE_KNI_NAMESIZE];
  	const struct rte_memzone *mz;
  	struct rte_kni_memzone_slot *slot = NULL;
  
  	if (!pktmbuf_pool || !conf || !conf->name[0])
  		return NULL;
  
  	/* Check if KNI subsystem has been initialized */
  	if (kni_memzone_pool.initialized != 1) {
  		RTE_LOG(ERR, KNI, "KNI subsystem has not been initialized. Invoke rte_kni_init() first\n");
  		return NULL;
  	}
  
  	/* Get an available slot from the pool */
  	slot = kni_memzone_pool_alloc();
  	if (!slot) {
  		RTE_LOG(ERR, KNI, "Cannot allocate more KNI interfaces; increase the number of max_kni_ifaces(current %d) or release unusued ones.\n",
  			kni_memzone_pool.max_ifaces);
  		return NULL;
  	}
  
  	/* Recover ctx */
  	ctx = slot->m_ctx->addr;
  	snprintf(intf_name, RTE_KNI_NAMESIZE, "%s", conf->name);
  
  	if (ctx->in_use) {
  		RTE_LOG(ERR, KNI, "KNI %s is in use\n", ctx->name);
  		return NULL;
  	}
  	memset(ctx, 0, sizeof(struct rte_kni));
  	if (ops)
  		memcpy(&ctx->ops, ops, sizeof(struct rte_kni_ops));
  
  	memset(&dev_info, 0, sizeof(dev_info));
  	dev_info.bus = conf->addr.bus;
  	dev_info.devid = conf->addr.devid;
  	dev_info.function = conf->addr.function;
  	dev_info.vendor_id = conf->id.vendor_id;
  	dev_info.device_id = conf->id.device_id;
  	dev_info.core_id = conf->core_id;
  	dev_info.force_bind = conf->force_bind;
  	dev_info.group_id = conf->group_id;
  	dev_info.mbuf_size = conf->mbuf_size;
  
  	snprintf(ctx->name, RTE_KNI_NAMESIZE, "%s", intf_name);
  	snprintf(dev_info.name, RTE_KNI_NAMESIZE, "%s", intf_name);
  
  	RTE_LOG(INFO, KNI, "pci: %02x:%02x:%02x \t %02x:%02x\n",
  		dev_info.bus, dev_info.devid, dev_info.function,
  			dev_info.vendor_id, dev_info.device_id);
  	/* TX RING */
  	mz = slot->m_tx_q;
  	ctx->tx_q = mz->addr;
  	kni_fifo_init(ctx->tx_q, KNI_FIFO_COUNT_MAX);
  	dev_info.tx_phys = mz->phys_addr;
  
  	/* RX RING */
  	mz = slot->m_rx_q;
  	ctx->rx_q = mz->addr;
  	kni_fifo_init(ctx->rx_q, KNI_FIFO_COUNT_MAX);
  	dev_info.rx_phys = mz->phys_addr;
  
  	/* ALLOC RING */
  	mz = slot->m_alloc_q;
  	ctx->alloc_q = mz->addr;
  	kni_fifo_init(ctx->alloc_q, KNI_FIFO_COUNT_MAX);
  	dev_info.alloc_phys = mz->phys_addr;
  
  	/* FREE RING */
  	mz = slot->m_free_q;
  	ctx->free_q = mz->addr;
  	kni_fifo_init(ctx->free_q, KNI_FIFO_COUNT_MAX);
  	dev_info.free_phys = mz->phys_addr;
  
  	/* Request RING */
  	mz = slot->m_req_q;
  	ctx->req_q = mz->addr;
  	kni_fifo_init(ctx->req_q, KNI_FIFO_COUNT_MAX);
  	dev_info.req_phys = mz->phys_addr;
  
  	/* Response RING */
  	mz = slot->m_resp_q;
  	ctx->resp_q = mz->addr;
  	kni_fifo_init(ctx->resp_q, KNI_FIFO_COUNT_MAX);
  	dev_info.resp_phys = mz->phys_addr;
  
  	/* Req/Resp sync mem area */
  	mz = slot->m_sync_addr;
  	ctx->sync_addr = mz->addr;
  	dev_info.sync_va = mz->addr;
  	dev_info.sync_phys = mz->phys_addr;
  
  	ctx->pktmbuf_pool = pktmbuf_pool;
  	ctx->group_id = conf->group_id;
  	ctx->slot_id = slot->id;
  	ctx->mbuf_size = conf->mbuf_size;
  
  	ret = ioctl(kni_fd, RTE_KNI_IOCTL_CREATE, &dev_info);
  	KNI_MEM_CHECK(ret < 0);
  
  	ctx->in_use = 1;
  
  	/* Allocate mbufs and then put them into alloc_q */
  	kni_allocate_mbufs(ctx);
  
  	return ctx;
  
  kni_fail:
  	if (slot)
  		kni_memzone_pool_release(&kni_memzone_pool.slots[slot->id]);
  
  	return NULL;
  }
  
  static void
  kni_free_fifo(struct rte_kni_fifo *fifo)
  {
  	int ret;
  	struct rte_mbuf *pkt;
  
  	do {
  		ret = kni_fifo_get(fifo, (void **)&pkt, 1);
  		if (ret)
  			rte_pktmbuf_free(pkt);
  	} while (ret);
  }
  
  static void
  kni_free_fifo_phy(struct rte_kni_fifo *fifo)
  {
  	void *mbuf_phys;
  	int ret;
  
  	do {
  		ret = kni_fifo_get(fifo, &mbuf_phys, 1);
  		/*
  		 * TODO: free mbufs
  		 */
  	} while (ret);
  }
  
  int
  rte_kni_release(struct rte_kni *kni)
  {
  	struct rte_kni_device_info dev_info;
  	uint32_t slot_id;
  
  	if (!kni || !kni->in_use)
  		return -1;
  
  	snprintf(dev_info.name, sizeof(dev_info.name), "%s", kni->name);
  	if (ioctl(kni_fd, RTE_KNI_IOCTL_RELEASE, &dev_info) < 0) {
  		RTE_LOG(ERR, KNI, "Fail to release kni device\n");
  		return -1;
  	}
  
  	/* mbufs in all fifo should be released, except request/response */
  	kni_free_fifo(kni->tx_q);
  	kni_free_fifo_phy(kni->rx_q);
  	kni_free_fifo_phy(kni->alloc_q);
  	kni_free_fifo(kni->free_q);
  
  	slot_id = kni->slot_id;
  
  	/* Memset the KNI struct */
  	memset(kni, 0, sizeof(struct rte_kni));
  
  	/* Release memzone */
  	if (slot_id > kni_memzone_pool.max_ifaces) {
  		RTE_LOG(ERR, KNI, "KNI pool: corrupted slot ID: %d, max: %d\n",
  			slot_id, kni_memzone_pool.max_ifaces);
  		return -1;
  	}
  	kni_memzone_pool_release(&kni_memzone_pool.slots[slot_id]);
  
  	return 0;
  }
  
  int
  rte_kni_handle_request(struct rte_kni *kni)
  {
  	unsigned ret;
  	struct rte_kni_request *req;
  
  	if (kni == NULL)
  		return -1;
  
  	/* Get request mbuf */
  	ret = kni_fifo_get(kni->req_q, (void **)&req, 1);
  	if (ret != 1)
  		return 0; /* It is OK of can not getting the request mbuf */
  
  	if (req != kni->sync_addr) {
  		RTE_LOG(ERR, KNI, "Wrong req pointer %p\n", req);
  		return -1;
  	}
  
  	/* Analyze the request and call the relevant actions for it */
  	switch (req->req_id) {
  	case RTE_KNI_REQ_CHANGE_MTU: /* Change MTU */
  		if (kni->ops.change_mtu)
  			req->result = kni->ops.change_mtu(kni->ops.port_id,
  							req->new_mtu);
  		break;
  	case RTE_KNI_REQ_CFG_NETWORK_IF: /* Set network interface up/down */
  		if (kni->ops.config_network_if)
  			req->result = kni->ops.config_network_if(\
  					kni->ops.port_id, req->if_up);
  		break;
  	default:
  		RTE_LOG(ERR, KNI, "Unknown request id %u\n", req->req_id);
  		req->result = -EINVAL;
  		break;
  	}
  
  	/* Construct response mbuf and put it back to resp_q */
  	ret = kni_fifo_put(kni->resp_q, (void **)&req, 1);
  	if (ret != 1) {
  		RTE_LOG(ERR, KNI, "Fail to put the muf back to resp_q\n");
  		return -1; /* It is an error of can't putting the mbuf back */
  	}
  
  	return 0;
  }
  
  static void *
  va2pa(struct rte_mbuf *m)
  {
  	return (void *)((unsigned long)m -
  			((unsigned long)m->buf_addr -
  			 (unsigned long)m->buf_physaddr));
  }
  
  unsigned
  rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned num)
  {
  	void *phy_mbufs[num];
  	unsigned int ret;
  	unsigned int i;
  
  	for (i = 0; i < num; i++)
  		phy_mbufs[i] = va2pa(mbufs[i]);
  
  	ret = kni_fifo_put(kni->rx_q, phy_mbufs, num);
  
  	/* Get mbufs from free_q and then free them */
  	kni_free_mbufs(kni);
  
  	return ret;
  }
  
  unsigned
  rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned num)
  {
  	unsigned ret = kni_fifo_get(kni->tx_q, (void **)mbufs, num);
  
  	/* If buffers removed, allocate mbufs and then put them into alloc_q */
  	if (ret)
  		kni_allocate_mbufs(kni);
  
  	return ret;
  }
  
  static void
  kni_free_mbufs(struct rte_kni *kni)
  {
  	int i, ret;
  	struct rte_mbuf *pkts[MAX_MBUF_BURST_NUM];
  
  	ret = kni_fifo_get(kni->free_q, (void **)pkts, MAX_MBUF_BURST_NUM);
  	if (likely(ret > 0)) {
  		for (i = 0; i < ret; i++)
  			rte_pktmbuf_free(pkts[i]);
  	}
  }
  
  static void
  kni_allocate_mbufs(struct rte_kni *kni)
  {
  	int i, ret;
  	struct rte_mbuf *pkts[MAX_MBUF_BURST_NUM];
  	void *phys[MAX_MBUF_BURST_NUM];
  
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pool) !=
  			 offsetof(struct rte_kni_mbuf, pool));
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, buf_addr) !=
  			 offsetof(struct rte_kni_mbuf, buf_addr));
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, next) !=
  			 offsetof(struct rte_kni_mbuf, next));
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_off) !=
  			 offsetof(struct rte_kni_mbuf, data_off));
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, data_len) !=
  			 offsetof(struct rte_kni_mbuf, data_len));
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, pkt_len) !=
  			 offsetof(struct rte_kni_mbuf, pkt_len));
  	RTE_BUILD_BUG_ON(offsetof(struct rte_mbuf, ol_flags) !=
  			 offsetof(struct rte_kni_mbuf, ol_flags));
  
  	/* Check if pktmbuf pool has been configured */
  	if (kni->pktmbuf_pool == NULL) {
  		RTE_LOG(ERR, KNI, "No valid mempool for allocating mbufs\n");
  		return;
  	}
  
  	for (i = 0; i < MAX_MBUF_BURST_NUM; i++) {
  		pkts[i] = rte_pktmbuf_alloc(kni->pktmbuf_pool);
  		if (unlikely(pkts[i] == NULL)) {
  			/* Out of memory */
  			RTE_LOG(ERR, KNI, "Out of memory\n");
  			break;
  		}
  		phys[i] = va2pa(pkts[i]);
  	}
  
  	/* No pkt mbuf alocated */
  	if (i <= 0)
  		return;
  
  	ret = kni_fifo_put(kni->alloc_q, phys, i);
  
  	/* Check if any mbufs not put into alloc_q, and then free them */
  	if (ret >= 0 && ret < i && ret < MAX_MBUF_BURST_NUM) {
  		int j;
  
  		for (j = ret; j < i; j++)
  			rte_pktmbuf_free(pkts[j]);
  	}
  }
  
  struct rte_kni *
  rte_kni_get(const char *name)
  {
  	uint32_t i;
  	struct rte_kni_memzone_slot *it;
  	struct rte_kni *kni;
  
  	/* Note: could be improved perf-wise if necessary */
  	for (i = 0; i < kni_memzone_pool.max_ifaces; i++) {
  		it = &kni_memzone_pool.slots[i];
  		if (it->in_use == 0)
  			continue;
  		kni = it->m_ctx->addr;
  		if (strncmp(kni->name, name, RTE_KNI_NAMESIZE) == 0)
  			return kni;
  	}
  
  	return NULL;
  }
  
  const char *
  rte_kni_get_name(const struct rte_kni *kni)
  {
  	return kni->name;
  }
  
  static enum kni_ops_status
  kni_check_request_register(struct rte_kni_ops *ops)
  {
  	/* check if KNI request ops has been registered*/
  	if( NULL == ops )
  		return KNI_REQ_NO_REGISTER;
  
  	if((NULL == ops->change_mtu) && (NULL == ops->config_network_if))
  		return KNI_REQ_NO_REGISTER;
  
  	return KNI_REQ_REGISTERED;
  }
  
  int
  rte_kni_register_handlers(struct rte_kni *kni,struct rte_kni_ops *ops)
  {
  	enum kni_ops_status req_status;
  
  	if (NULL == ops) {
  		RTE_LOG(ERR, KNI, "Invalid KNI request operation.\n");
  		return -1;
  	}
  
  	if (NULL == kni) {
  		RTE_LOG(ERR, KNI, "Invalid kni info.\n");
  		return -1;
  	}
  
  	req_status = kni_check_request_register(&kni->ops);
  	if ( KNI_REQ_REGISTERED == req_status) {
  		RTE_LOG(ERR, KNI, "The KNI request operation has already registered.\n");
  		return -1;
  	}
  
  	memcpy(&kni->ops, ops, sizeof(struct rte_kni_ops));
  	return 0;
  }
  
  int
  rte_kni_unregister_handlers(struct rte_kni *kni)
  {
  	if (NULL == kni) {
  		RTE_LOG(ERR, KNI, "Invalid kni info.\n");
  		return -1;
  	}
  
  	kni->ops.change_mtu = NULL;
  	kni->ops.config_network_if = NULL;
  	return 0;
  }
  void
  rte_kni_close(void)
  {
  	if (kni_fd < 0)
  		return;
  
  	close(kni_fd);
  	kni_fd = -1;
  }
  