1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
12 * The KNI library provides the ability to create and destroy kernel NIC
13 * interfaces that may be used by the RTE application to receive/transmit
14 * packets from/to Linux kernel net interfaces.
16 * This library provides two APIs to burst receive packets from KNI interfaces,
17 * and burst transmit packets to KNI interfaces.
21 #include <rte_memory.h>
22 #include <rte_mempool.h>
24 #include <exec-env/rte_kni_common.h>
34 * Structure which has the function pointers for KNI interface.
37 uint16_t port_id; /* Port ID */
39 /* Pointer to function of changing MTU */
40 int (*change_mtu)(uint16_t port_id, unsigned int new_mtu);
42 /* Pointer to function of configuring network interface */
43 int (*config_network_if)(uint16_t port_id, uint8_t if_up);
47 * Structure for configuring KNI device.
51 * KNI name which will be used in relevant network device.
52 * Let the name as short as possible, as it will be part of
55 char name[RTE_KNI_NAMESIZE];
56 uint32_t core_id; /* Core ID to bind kernel thread on */
57 uint16_t group_id; /* Group ID */
58 unsigned mbuf_size; /* mbuf size */
59 struct rte_pci_addr addr;
63 uint8_t force_bind : 1; /* Flag to bind kernel thread */
67 * Initialize and preallocate KNI subsystem
69 * This function is to be executed on the MASTER lcore only, after EAL
70 * initialization and before any KNI interface is attempted to be
73 * @param max_kni_ifaces
74 * The maximum number of KNI interfaces that can coexist concurrently
76 void rte_kni_init(unsigned int max_kni_ifaces);
80 * Allocate KNI interface according to the port id, mbuf size, mbuf pool,
81 * configurations and callbacks for kernel requests.The KNI interface created
82 * in the kernel space is the net interface the traditional Linux application
85 * The rte_kni_alloc shall not be called before rte_kni_init() has been
86 * called. rte_kni_alloc is thread safe.
88 * The mempool should have capacity of more than "2 x KNI_FIFO_COUNT_MAX"
89 * elements for each KNI interface allocated.
92 * The mempool for allocating mbufs for packets.
94 * The pointer to the configurations of the KNI device.
96 * The pointer to the callbacks for the KNI kernel requests.
99 * - The pointer to the context of a KNI interface.
100 * - NULL indicate error.
102 struct rte_kni *rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
103 const struct rte_kni_conf *conf, struct rte_kni_ops *ops);
106 * Release KNI interface according to the context. It will also release the
107 * paired KNI interface in kernel space. All processing on the specific KNI
108 * context need to be stopped before calling this interface.
110 * rte_kni_release is thread safe.
113 * The pointer to the context of an existent KNI interface.
116 * - 0 indicates success.
117 * - negative value indicates failure.
119 int rte_kni_release(struct rte_kni *kni);
122 * It is used to handle the request mbufs sent from kernel space.
123 * Then analyzes it and calls the specific actions for the specific requests.
124 * Finally constructs the response mbuf and puts it back to the resp_q.
127 * The pointer to the context of an existent KNI interface.
131 * - negative value indicates failure.
133 int rte_kni_handle_request(struct rte_kni *kni);
136 * Retrieve a burst of packets from a KNI interface. The retrieved packets are
137 * stored in rte_mbuf structures whose pointers are supplied in the array of
138 * mbufs, and the maximum number is indicated by num. It handles allocating
139 * the mbufs for KNI interface alloc queue.
142 * The KNI interface context.
144 * The array to store the pointers of mbufs.
146 * The maximum number per burst.
149 * The actual number of packets retrieved.
151 unsigned rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs,
155 * Send a burst of packets to a KNI interface. The packets to be sent out are
156 * stored in rte_mbuf structures whose pointers are supplied in the array of
157 * mbufs, and the maximum number is indicated by num. It handles the freeing of
158 * the mbufs in the free queue of KNI interface.
161 * The KNI interface context.
163 * The array to store the pointers of mbufs.
165 * The maximum number per burst.
168 * The actual number of packets sent.
170 unsigned rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs,
174 * Get the KNI context of its name.
177 * pointer to the KNI device name.
180 * On success: Pointer to KNI interface.
183 struct rte_kni *rte_kni_get(const char *name);
186 * Get the name given to a KNI device
189 * The KNI instance to query
191 * The pointer to the KNI name
193 const char *rte_kni_get_name(const struct rte_kni *kni);
196 * Register KNI request handling for a specified port,and it can
197 * be called by master process or slave process.
200 * pointer to struct rte_kni.
202 * pointer to struct rte_kni_ops.
208 int rte_kni_register_handlers(struct rte_kni *kni, struct rte_kni_ops *ops);
211 * Unregister KNI request handling for a specified port.
214 * pointer to struct rte_kni.
220 int rte_kni_unregister_handlers(struct rte_kni *kni);
225 void rte_kni_close(void);
231 #endif /* _RTE_KNI_H_ */