1 files changed, 830 insertions, 0 deletions

diff --git a/src/spdk/dpdk/lib/librte_kni/rte_kni.c b/src/spdk/dpdk/lib/librte_kni/rte_kni.c
new file mode 100644
index 000000000..bcf82cc2d
--- /dev/null
+++ b/src/spdk/dpdk/lib/librte_kni/rte_kni.c
@@ -0,0 +1,830 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
+ */
+
+#ifndef RTE_EXEC_ENV_LINUX
+#error "KNI is not supported"
+#endif
+
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <linux/version.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 <rte_tailq.h>
+#include <rte_rwlock.h>
+#include <rte_eal_memconfig.h>
+#include <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, fail) do { if (cond) goto fail; } while (0)
+
+#define KNI_MZ_NAME_FMT			"kni_info_%s"
+#define KNI_TX_Q_MZ_NAME_FMT		"kni_tx_%s"
+#define KNI_RX_Q_MZ_NAME_FMT		"kni_rx_%s"
+#define KNI_ALLOC_Q_MZ_NAME_FMT		"kni_alloc_%s"
+#define KNI_FREE_Q_MZ_NAME_FMT		"kni_free_%s"
+#define KNI_REQ_Q_MZ_NAME_FMT		"kni_req_%s"
+#define KNI_RESP_Q_MZ_NAME_FMT		"kni_resp_%s"
+#define KNI_SYNC_ADDR_MZ_NAME_FMT	"kni_sync_%s"
+
+TAILQ_HEAD(rte_kni_list, rte_tailq_entry);
+
+static struct rte_tailq_elem rte_kni_tailq = {
+	.name = "RTE_KNI",
+};
+EAL_REGISTER_TAILQ(rte_kni_tailq)
+
+/**
+ * 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 int mbuf_size;                 /**< mbuf size */
+
+	const struct rte_memzone *m_tx_q;   /**< TX queue memzone */
+	const struct rte_memzone *m_rx_q;   /**< RX queue memzone */
+	const struct rte_memzone *m_alloc_q;/**< Alloc queue memzone */
+	const struct rte_memzone *m_free_q; /**< Free queue memzone */
+
+	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 */
+
+	const struct rte_memzone *m_req_q;  /**< Request queue memzone */
+	const struct rte_memzone *m_resp_q; /**< Response queue memzone */
+	const struct rte_memzone *m_sync_addr;/**< Sync addr memzone */
+
+	/* 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 */
+};
+
+enum kni_ops_status {
+	KNI_REQ_NO_REGISTER = 0,
+	KNI_REQ_REGISTERED,
+};
+
+static void kni_free_mbufs(struct rte_kni *kni);
+static void kni_allocate_mbufs(struct rte_kni *kni);
+
+static volatile int kni_fd = -1;
+
+/* Shall be called before any allocation happens */
+int
+rte_kni_init(unsigned int max_kni_ifaces __rte_unused)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
+	if (rte_eal_iova_mode() != RTE_IOVA_PA) {
+		RTE_LOG(ERR, KNI, "KNI requires IOVA as PA\n");
+		return -1;
+	}
+#endif
+
+	/* 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 -1;
+		}
+	}
+
+	return 0;
+}
+
+static struct rte_kni *
+__rte_kni_get(const char *name)
+{
+	struct rte_kni *kni;
+	struct rte_tailq_entry *te;
+	struct rte_kni_list *kni_list;
+
+	kni_list = RTE_TAILQ_CAST(rte_kni_tailq.head, rte_kni_list);
+
+	TAILQ_FOREACH(te, kni_list, next) {
+		kni = te->data;
+		if (strncmp(name, kni->name, RTE_KNI_NAMESIZE) == 0)
+			break;
+	}
+
+	if (te == NULL)
+		kni = NULL;
+
+	return kni;
+}
+
+static int
+kni_reserve_mz(struct rte_kni *kni)
+{
+	char mz_name[RTE_MEMZONE_NAMESIZE];
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_TX_Q_MZ_NAME_FMT, kni->name);
+	kni->m_tx_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_tx_q == NULL, tx_q_fail);
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_RX_Q_MZ_NAME_FMT, kni->name);
+	kni->m_rx_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_rx_q == NULL, rx_q_fail);
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_ALLOC_Q_MZ_NAME_FMT, kni->name);
+	kni->m_alloc_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_alloc_q == NULL, alloc_q_fail);
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_FREE_Q_MZ_NAME_FMT, kni->name);
+	kni->m_free_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_free_q == NULL, free_q_fail);
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_REQ_Q_MZ_NAME_FMT, kni->name);
+	kni->m_req_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_req_q == NULL, req_q_fail);
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_RESP_Q_MZ_NAME_FMT, kni->name);
+	kni->m_resp_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_resp_q == NULL, resp_q_fail);
+
+	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_SYNC_ADDR_MZ_NAME_FMT, kni->name);
+	kni->m_sync_addr = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY,
+			RTE_MEMZONE_IOVA_CONTIG);
+	KNI_MEM_CHECK(kni->m_sync_addr == NULL, sync_addr_fail);
+
+	return 0;
+
+sync_addr_fail:
+	rte_memzone_free(kni->m_resp_q);
+resp_q_fail:
+	rte_memzone_free(kni->m_req_q);
+req_q_fail:
+	rte_memzone_free(kni->m_free_q);
+free_q_fail:
+	rte_memzone_free(kni->m_alloc_q);
+alloc_q_fail:
+	rte_memzone_free(kni->m_rx_q);
+rx_q_fail:
+	rte_memzone_free(kni->m_tx_q);
+tx_q_fail:
+	return -1;
+}
+
+static void
+kni_release_mz(struct rte_kni *kni)
+{
+	rte_memzone_free(kni->m_tx_q);
+	rte_memzone_free(kni->m_rx_q);
+	rte_memzone_free(kni->m_alloc_q);
+	rte_memzone_free(kni->m_free_q);
+	rte_memzone_free(kni->m_req_q);
+	rte_memzone_free(kni->m_resp_q);
+	rte_memzone_free(kni->m_sync_addr);
+}
+
+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 *kni;
+	struct rte_tailq_entry *te;
+	struct rte_kni_list *kni_list;
+
+	if (!pktmbuf_pool || !conf || !conf->name[0])
+		return NULL;
+
+	/* Check if KNI subsystem has been initialized */
+	if (kni_fd < 0) {
+		RTE_LOG(ERR, KNI, "KNI subsystem has not been initialized. Invoke rte_kni_init() first\n");
+		return NULL;
+	}
+
+	rte_mcfg_tailq_write_lock();
+
+	kni = __rte_kni_get(conf->name);
+	if (kni != NULL) {
+		RTE_LOG(ERR, KNI, "KNI already exists\n");
+		goto unlock;
+	}
+
+	te = rte_zmalloc("KNI_TAILQ_ENTRY", sizeof(*te), 0);
+	if (te == NULL) {
+		RTE_LOG(ERR, KNI, "Failed to allocate tailq entry\n");
+		goto unlock;
+	}
+
+	kni = rte_zmalloc("KNI", sizeof(struct rte_kni), RTE_CACHE_LINE_SIZE);
+	if (kni == NULL) {
+		RTE_LOG(ERR, KNI, "KNI memory allocation failed\n");
+		goto kni_fail;
+	}
+
+	strlcpy(kni->name, conf->name, RTE_KNI_NAMESIZE);
+
+	if (ops)
+		memcpy(&kni->ops, ops, sizeof(struct rte_kni_ops));
+	else
+		kni->ops.port_id = UINT16_MAX;
+
+	memset(&dev_info, 0, sizeof(dev_info));
+	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;
+	dev_info.mtu = conf->mtu;
+	dev_info.min_mtu = conf->min_mtu;
+	dev_info.max_mtu = conf->max_mtu;
+
+	memcpy(dev_info.mac_addr, conf->mac_addr, RTE_ETHER_ADDR_LEN);
+
+	strlcpy(dev_info.name, conf->name, RTE_KNI_NAMESIZE);
+
+	ret = kni_reserve_mz(kni);
+	if (ret < 0)
+		goto mz_fail;
+
+	/* TX RING */
+	kni->tx_q = kni->m_tx_q->addr;
+	kni_fifo_init(kni->tx_q, KNI_FIFO_COUNT_MAX);
+	dev_info.tx_phys = kni->m_tx_q->phys_addr;
+
+	/* RX RING */
+	kni->rx_q = kni->m_rx_q->addr;
+	kni_fifo_init(kni->rx_q, KNI_FIFO_COUNT_MAX);
+	dev_info.rx_phys = kni->m_rx_q->phys_addr;
+
+	/* ALLOC RING */
+	kni->alloc_q = kni->m_alloc_q->addr;
+	kni_fifo_init(kni->alloc_q, KNI_FIFO_COUNT_MAX);
+	dev_info.alloc_phys = kni->m_alloc_q->phys_addr;
+
+	/* FREE RING */
+	kni->free_q = kni->m_free_q->addr;
+	kni_fifo_init(kni->free_q, KNI_FIFO_COUNT_MAX);
+	dev_info.free_phys = kni->m_free_q->phys_addr;
+
+	/* Request RING */
+	kni->req_q = kni->m_req_q->addr;
+	kni_fifo_init(kni->req_q, KNI_FIFO_COUNT_MAX);
+	dev_info.req_phys = kni->m_req_q->phys_addr;
+
+	/* Response RING */
+	kni->resp_q = kni->m_resp_q->addr;
+	kni_fifo_init(kni->resp_q, KNI_FIFO_COUNT_MAX);
+	dev_info.resp_phys = kni->m_resp_q->phys_addr;
+
+	/* Req/Resp sync mem area */
+	kni->sync_addr = kni->m_sync_addr->addr;
+	dev_info.sync_va = kni->m_sync_addr->addr;
+	dev_info.sync_phys = kni->m_sync_addr->phys_addr;
+
+	kni->pktmbuf_pool = pktmbuf_pool;
+	kni->group_id = conf->group_id;
+	kni->mbuf_size = conf->mbuf_size;
+
+	dev_info.iova_mode = (rte_eal_iova_mode() == RTE_IOVA_VA) ? 1 : 0;
+
+	ret = ioctl(kni_fd, RTE_KNI_IOCTL_CREATE, &dev_info);
+	if (ret < 0)
+		goto ioctl_fail;
+
+	te->data = kni;
+
+	kni_list = RTE_TAILQ_CAST(rte_kni_tailq.head, rte_kni_list);
+	TAILQ_INSERT_TAIL(kni_list, te, next);
+
+	rte_mcfg_tailq_write_unlock();
+
+	/* Allocate mbufs and then put them into alloc_q */
+	kni_allocate_mbufs(kni);
+
+	return kni;
+
+ioctl_fail:
+	kni_release_mz(kni);
+mz_fail:
+	rte_free(kni);
+kni_fail:
+	rte_free(te);
+unlock:
+	rte_mcfg_tailq_write_unlock();
+
+	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 *
+va2pa(struct rte_mbuf *m)
+{
+	return (void *)((unsigned long)m -
+			((unsigned long)m->buf_addr -
+			 (unsigned long)m->buf_iova));
+}
+
+static void *
+va2pa_all(struct rte_mbuf *mbuf)
+{
+	void *phy_mbuf = va2pa(mbuf);
+	struct rte_mbuf *next = mbuf->next;
+	while (next) {
+		mbuf->next = va2pa(next);
+		mbuf = next;
+		next = mbuf->next;
+	}
+	return phy_mbuf;
+}
+
+static void
+obj_free(struct rte_mempool *mp __rte_unused, void *opaque, void *obj,
+		unsigned obj_idx __rte_unused)
+{
+	struct rte_mbuf *m = obj;
+	void *mbuf_phys = opaque;
+
+	if (va2pa(m) == mbuf_phys)
+		rte_pktmbuf_free(m);
+}
+
+static void
+kni_free_fifo_phy(struct rte_mempool *mp, struct rte_kni_fifo *fifo)
+{
+	void *mbuf_phys;
+	int ret;
+
+	do {
+		ret = kni_fifo_get(fifo, &mbuf_phys, 1);
+		if (ret)
+			rte_mempool_obj_iter(mp, obj_free, mbuf_phys);
+	} while (ret);
+}
+
+int
+rte_kni_release(struct rte_kni *kni)
+{
+	struct rte_tailq_entry *te;
+	struct rte_kni_list *kni_list;
+	struct rte_kni_device_info dev_info;
+	uint32_t retry = 5;
+
+	if (!kni)
+		return -1;
+
+	kni_list = RTE_TAILQ_CAST(rte_kni_tailq.head, rte_kni_list);
+
+	rte_mcfg_tailq_write_lock();
+
+	TAILQ_FOREACH(te, kni_list, next) {
+		if (te->data == kni)
+			break;
+	}
+
+	if (te == NULL)
+		goto unlock;
+
+	strlcpy(dev_info.name, kni->name, sizeof(dev_info.name));
+	if (ioctl(kni_fd, RTE_KNI_IOCTL_RELEASE, &dev_info) < 0) {
+		RTE_LOG(ERR, KNI, "Fail to release kni device\n");
+		goto unlock;
+	}
+
+	TAILQ_REMOVE(kni_list, te, next);
+
+	rte_mcfg_tailq_write_unlock();
+
+	/* mbufs in all fifo should be released, except request/response */
+
+	/* wait until all rxq packets processed by kernel */
+	while (kni_fifo_count(kni->rx_q) && retry--)
+		usleep(1000);
+
+	if (kni_fifo_count(kni->rx_q))
+		RTE_LOG(ERR, KNI, "Fail to free all Rx-q items\n");
+
+	kni_free_fifo_phy(kni->pktmbuf_pool, kni->alloc_q);
+	kni_free_fifo(kni->tx_q);
+	kni_free_fifo(kni->free_q);
+
+	kni_release_mz(kni);
+
+	rte_free(kni);
+
+	rte_free(te);
+
+	return 0;
+
+unlock:
+	rte_mcfg_tailq_write_unlock();
+
+	return -1;
+}
+
+/* default callback for request of configuring device mac address */
+static int
+kni_config_mac_address(uint16_t port_id, uint8_t mac_addr[])
+{
+	int ret = 0;
+
+	if (!rte_eth_dev_is_valid_port(port_id)) {
+		RTE_LOG(ERR, KNI, "Invalid port id %d\n", port_id);
+		return -EINVAL;
+	}
+
+	RTE_LOG(INFO, KNI, "Configure mac address of %d", port_id);
+
+	ret = rte_eth_dev_default_mac_addr_set(port_id,
+					(struct rte_ether_addr *)mac_addr);
+	if (ret < 0)
+		RTE_LOG(ERR, KNI, "Failed to config mac_addr for port %d\n",
+			port_id);
+
+	return ret;
+}
+
+/* default callback for request of configuring promiscuous mode */
+static int
+kni_config_promiscusity(uint16_t port_id, uint8_t to_on)
+{
+	int ret;
+
+	if (!rte_eth_dev_is_valid_port(port_id)) {
+		RTE_LOG(ERR, KNI, "Invalid port id %d\n", port_id);
+		return -EINVAL;
+	}
+
+	RTE_LOG(INFO, KNI, "Configure promiscuous mode of %d to %d\n",
+		port_id, to_on);
+
+	if (to_on)
+		ret = rte_eth_promiscuous_enable(port_id);
+	else
+		ret = rte_eth_promiscuous_disable(port_id);
+
+	if (ret != 0)
+		RTE_LOG(ERR, KNI,
+			"Failed to %s promiscuous mode for port %u: %s\n",
+			to_on ? "enable" : "disable", port_id,
+			rte_strerror(-ret));
+
+	return ret;
+}
+
+/* default callback for request of configuring allmulticast mode */
+static int
+kni_config_allmulticast(uint16_t port_id, uint8_t to_on)
+{
+	if (!rte_eth_dev_is_valid_port(port_id)) {
+		RTE_LOG(ERR, KNI, "Invalid port id %d\n", port_id);
+		return -EINVAL;
+	}
+
+	RTE_LOG(INFO, KNI, "Configure allmulticast mode of %d to %d\n",
+		port_id, to_on);
+
+	if (to_on)
+		rte_eth_allmulticast_enable(port_id);
+	else
+		rte_eth_allmulticast_disable(port_id);
+
+	return 0;
+}
+
+int
+rte_kni_handle_request(struct rte_kni *kni)
+{
+	unsigned int ret;
+	struct rte_kni_request *req = NULL;
+
+	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;
+	case RTE_KNI_REQ_CHANGE_MAC_ADDR: /* Change MAC Address */
+		if (kni->ops.config_mac_address)
+			req->result = kni->ops.config_mac_address(
+					kni->ops.port_id, req->mac_addr);
+		else if (kni->ops.port_id != UINT16_MAX)
+			req->result = kni_config_mac_address(
+					kni->ops.port_id, req->mac_addr);
+		break;
+	case RTE_KNI_REQ_CHANGE_PROMISC: /* Change PROMISCUOUS MODE */
+		if (kni->ops.config_promiscusity)
+			req->result = kni->ops.config_promiscusity(
+					kni->ops.port_id, req->promiscusity);
+		else if (kni->ops.port_id != UINT16_MAX)
+			req->result = kni_config_promiscusity(
+					kni->ops.port_id, req->promiscusity);
+		break;
+	case RTE_KNI_REQ_CHANGE_ALLMULTI: /* Change ALLMULTICAST MODE */
+		if (kni->ops.config_allmulticast)
+			req->result = kni->ops.config_allmulticast(
+					kni->ops.port_id, req->allmulti);
+		else if (kni->ops.port_id != UINT16_MAX)
+			req->result = kni_config_allmulticast(
+					kni->ops.port_id, req->allmulti);
+		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;
+}
+
+unsigned
+rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, unsigned int num)
+{
+	num = RTE_MIN(kni_fifo_free_count(kni->rx_q), num);
+	void *phy_mbufs[num];
+	unsigned int ret;
+	unsigned int i;
+
+	for (i = 0; i < num; i++)
+		phy_mbufs[i] = va2pa_all(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 int num)
+{
+	unsigned int 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];
+	int allocq_free;
+
+	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;
+	}
+
+	allocq_free = (kni->alloc_q->read - kni->alloc_q->write - 1)
+			& (MAX_MBUF_BURST_NUM - 1);
+	for (i = 0; i < allocq_free; 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 allocated */
+	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)
+{
+	struct rte_kni *kni;
+
+	if (name == NULL || name[0] == '\0')
+		return NULL;
+
+	rte_mcfg_tailq_read_lock();
+
+	kni = __rte_kni_get(name);
+
+	rte_mcfg_tailq_read_unlock();
+
+	return kni;
+}
+
+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 (ops == NULL)
+		return KNI_REQ_NO_REGISTER;
+
+	if (ops->change_mtu == NULL
+	    && ops->config_network_if == NULL
+	    && ops->config_mac_address == NULL
+	    && ops->config_promiscusity == NULL
+	    && ops->config_allmulticast == NULL)
+		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 (ops == NULL) {
+		RTE_LOG(ERR, KNI, "Invalid KNI request operation.\n");
+		return -1;
+	}
+
+	if (kni == NULL) {
+		RTE_LOG(ERR, KNI, "Invalid kni info.\n");
+		return -1;
+	}
+
+	req_status = kni_check_request_register(&kni->ops);
+	if (req_status == KNI_REQ_REGISTERED) {
+		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 (kni == NULL) {
+		RTE_LOG(ERR, KNI, "Invalid kni info.\n");
+		return -1;
+	}
+
+	memset(&kni->ops, 0, sizeof(struct rte_kni_ops));
+
+	return 0;
+}
+
+int
+rte_kni_update_link(struct rte_kni *kni, unsigned int linkup)
+{
+	char path[64];
+	char old_carrier[2];
+	const char *new_carrier;
+	int old_linkup;
+	int fd, ret;
+
+	if (kni == NULL)
+		return -1;
+
+	snprintf(path, sizeof(path), "/sys/devices/virtual/net/%s/carrier",
+		kni->name);
+
+	fd = open(path, O_RDWR);
+	if (fd == -1) {
+		RTE_LOG(ERR, KNI, "Failed to open file: %s.\n", path);
+		return -1;
+	}
+
+	ret = read(fd, old_carrier, 2);
+	if (ret < 1) {
+		close(fd);
+		return -1;
+	}
+	old_linkup = (old_carrier[0] == '1');
+
+	new_carrier = linkup ? "1" : "0";
+	ret = write(fd, new_carrier, 1);
+	if (ret < 1) {
+		RTE_LOG(ERR, KNI, "Failed to write file: %s.\n", path);
+		close(fd);
+		return -1;
+	}
+
+	close(fd);
+	return old_linkup;
+}
+
+void
+rte_kni_close(void)
+{
+	if (kni_fd < 0)
+		return;
+
+	close(kni_fd);
+	kni_fd = -1;
+}