aboutsummaryrefslogtreecommitdiffstats
path: root/lib/librte_kni/rte_kni.h
blob: 99055e2c2522969fd94df9022159b67d3ebe7698 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef _RTE_KNI_H_
#define _RTE_KNI_H_

/**
 * @file
 * RTE KNI
 *
 * The KNI library provides the ability to create and destroy kernel NIC
 * interfaces that may be used by the RTE application to receive/transmit
 * packets from/to Linux kernel net interfaces.
 *
 * This library provides two APIs to burst receive packets from KNI interfaces,
 * and burst transmit packets to KNI interfaces.
 */

#include <rte_pci.h>
#include <rte_memory.h>
#include <rte_mempool.h>
#include <rte_ether.h>

#include <exec-env/rte_kni_common.h>

#ifdef __cplusplus
extern "C" {
#endif

struct rte_kni;
struct rte_mbuf;

/**
 * Structure which has the function pointers for KNI interface.
 */
struct rte_kni_ops {
	uint16_t port_id; /* Port ID */

	/* Pointer to function of changing MTU */
	int (*change_mtu)(uint16_t port_id, unsigned int new_mtu);

	/* Pointer to function of configuring network interface */
	int (*config_network_if)(uint16_t port_id, uint8_t if_up);

	/* Pointer to function of configuring mac address */
	int (*config_mac_address)(uint16_t port_id, uint8_t mac_addr[]);

	/* Pointer to function of configuring promiscuous mode */
	int (*config_promiscusity)(uint16_t port_id, uint8_t to_on);
};

/**
 * Structure for configuring KNI device.
 */
struct rte_kni_conf {
	/*
	 * KNI name which will be used in relevant network device.
	 * Let the name as short as possible, as it will be part of
	 * memzone name.
	 */
	char name[RTE_KNI_NAMESIZE];
	uint32_t core_id;   /* Core ID to bind kernel thread on */
	uint16_t group_id;  /* Group ID */
	unsigned mbuf_size; /* mbuf size */
	struct rte_pci_addr addr;
	struct rte_pci_id id;

	__extension__
	uint8_t force_bind : 1; /* Flag to bind kernel thread */
	char mac_addr[ETHER_ADDR_LEN]; /* MAC address assigned to KNI */
	uint16_t mtu;
};

/**
 * Initialize and preallocate KNI subsystem
 *
 * This function is to be executed on the MASTER lcore only, after EAL
 * initialization and before any KNI interface is attempted to be
 * allocated
 *
 * @param max_kni_ifaces
 *  The maximum number of KNI interfaces that can coexist concurrently
 */
void rte_kni_init(unsigned int max_kni_ifaces);


/**
 * Allocate KNI interface according to the port id, mbuf size, mbuf pool,
 * configurations and callbacks for kernel requests.The KNI interface created
 * in the kernel space is the net interface the traditional Linux application
 * talking to.
 *
 * The rte_kni_alloc shall not be called before rte_kni_init() has been
 * called. rte_kni_alloc is thread safe.
 *
 * The mempool should have capacity of more than "2 x KNI_FIFO_COUNT_MAX"
 * elements for each KNI interface allocated.
 *
 * @param pktmbuf_pool
 *  The mempool for allocating mbufs for packets.
 * @param conf
 *  The pointer to the configurations of the KNI device.
 * @param ops
 *  The pointer to the callbacks for the KNI kernel requests.
 *
 * @return
 *  - The pointer to the context of a KNI interface.
 *  - NULL indicate error.
 */
struct rte_kni *rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
		const struct rte_kni_conf *conf, struct rte_kni_ops *ops);

/**
 * Release KNI interface according to the context. It will also release the
 * paired KNI interface in kernel space. All processing on the specific KNI
 * context need to be stopped before calling this interface.
 *
 * rte_kni_release is thread safe.
 *
 * @param kni
 *  The pointer to the context of an existent KNI interface.
 *
 * @return
 *  - 0 indicates success.
 *  - negative value indicates failure.
 */
int rte_kni_release(struct rte_kni *kni);

/**
 * It is used to handle the request mbufs sent from kernel space.
 * Then analyzes it and calls the specific actions for the specific requests.
 * Finally constructs the response mbuf and puts it back to the resp_q.
 *
 * @param kni
 *  The pointer to the context of an existent KNI interface.
 *
 * @return
 *  - 0
 *  - negative value indicates failure.
 */
int rte_kni_handle_request(struct rte_kni *kni);

/**
 * Retrieve a burst of packets from a KNI interface. The retrieved packets are
 * stored in rte_mbuf structures whose pointers are supplied in the array of
 * mbufs, and the maximum number is indicated by num. It handles allocating
 * the mbufs for KNI interface alloc queue.
 *
 * @param kni
 *  The KNI interface context.
 * @param mbufs
 *  The array to store the pointers of mbufs.
 * @param num
 *  The maximum number per burst.
 *
 * @return
 *  The actual number of packets retrieved.
 */
unsigned rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs,
		unsigned num);

/**
 * Send a burst of packets to a KNI interface. The packets to be sent out are
 * stored in rte_mbuf structures whose pointers are supplied in the array of
 * mbufs, and the maximum number is indicated by num. It handles the freeing of
 * the mbufs in the free queue of KNI interface.
 *
 * @param kni
 *  The KNI interface context.
 * @param mbufs
 *  The array to store the pointers of mbufs.
 * @param num
 *  The maximum number per burst.
 *
 * @return
 *  The actual number of packets sent.
 */
unsigned rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs,
		unsigned num);

/**
 * Get the KNI context of its name.
 *
 * @param name
 *  pointer to the KNI device name.
 *
 * @return
 *  On success: Pointer to KNI interface.
 *  On failure: NULL.
 */
struct rte_kni *rte_kni_get(const char *name);

/**
 * Get the name given to a KNI device
 *
 * @param kni
 *   The KNI instance to query
 * @return
 *   The pointer to the KNI name
 */
const char *rte_kni_get_name(const struct rte_kni *kni);

/**
 * Register KNI request handling for a specified port,and it can
 * be called by master process or slave process.
 *
 * @param kni
 *  pointer to struct rte_kni.
 * @param ops
 *  pointer to struct rte_kni_ops.
 *
 * @return
 *  On success: 0
 *  On failure: -1
 */
int rte_kni_register_handlers(struct rte_kni *kni, struct rte_kni_ops *ops);

/**
 *  Unregister KNI request handling for a specified port.
 *
 *  @param kni
 *   pointer to struct rte_kni.
 *
 *  @return
 *   On success: 0
 *   On failure: -1
 */
int rte_kni_unregister_handlers(struct rte_kni *kni);

/**
 *  Close KNI device.
 */
void rte_kni_close(void);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_KNI_H_ */