ceph/src/dpdk/lib/librte_kni/rte_kni.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _RTE_KNI_H_
  35 #define _RTE_KNI_H_
  36
  37 /**
  38  * @file
  39  * RTE KNI
  40  *
  41  * The KNI library provides the ability to create and destroy kernel NIC
  42  * interfaces that may be used by the RTE application to receive/transmit
  43  * packets from/to Linux kernel net interfaces.
  44  *
  45  * This library provides two APIs to burst receive packets from KNI interfaces,
  46  * and burst transmit packets to KNI interfaces.
  47  */
  48
  49 #include <rte_pci.h>
  50 #include <rte_memory.h>
  51 #include <rte_mempool.h>
  52
  53 #include <exec-env/rte_kni_common.h>
  54
  55 #ifdef __cplusplus
  56 extern "C" {
  57 #endif
  58
  59 struct rte_kni;
  60 struct rte_mbuf;
  61
  62 /**
  63  * Structure which has the function pointers for KNI interface.
  64  */
  65 struct rte_kni_ops {
  66         uint8_t port_id; /* Port ID */
  67
  68         /* Pointer to function of changing MTU */
  69         int (*change_mtu)(uint8_t port_id, unsigned new_mtu);
  70
  71         /* Pointer to function of configuring network interface */
  72         int (*config_network_if)(uint8_t port_id, uint8_t if_up);
  73 };
  74
  75 /**
  76  * Structure for configuring KNI device.
  77  */
  78 struct rte_kni_conf {
  79         /*
  80          * KNI name which will be used in relevant network device.
  81          * Let the name as short as possible, as it will be part of
  82          * memzone name.
  83          */
  84         char name[RTE_KNI_NAMESIZE];
  85         uint32_t core_id;   /* Core ID to bind kernel thread on */
  86         uint16_t group_id;  /* Group ID */
  87         unsigned mbuf_size; /* mbuf size */
  88         struct rte_pci_addr addr;
  89         struct rte_pci_id id;
  90
  91         __extension__
  92         uint8_t force_bind : 1; /* Flag to bind kernel thread */
  93 };
  94
  95 /**
  96  * Initialize and preallocate KNI subsystem
  97  *
  98  * This function is to be executed on the MASTER lcore only, after EAL
  99  * initialization and before any KNI interface is attempted to be
 100  * allocated
 101  *
 102  * @param max_kni_ifaces
 103  *  The maximum number of KNI interfaces that can coexist concurrently
 104  */
 105 void rte_kni_init(unsigned int max_kni_ifaces);
 106
 107
 108 /**
 109  * Allocate KNI interface according to the port id, mbuf size, mbuf pool,
 110  * configurations and callbacks for kernel requests.The KNI interface created
 111  * in the kernel space is the net interface the traditional Linux application
 112  * talking to.
 113  *
 114  * The rte_kni_alloc shall not be called before rte_kni_init() has been
 115  * called. rte_kni_alloc is thread safe.
 116  *
 117  * The mempool should have capacity of more than "2 x KNI_FIFO_COUNT_MAX"
 118  * elements for each KNI interface allocated.
 119  *
 120  * @param pktmbuf_pool
 121  *  The mempool for allocting mbufs for packets.
 122  * @param conf
 123  *  The pointer to the configurations of the KNI device.
 124  * @param ops
 125  *  The pointer to the callbacks for the KNI kernel requests.
 126  *
 127  * @return
 128  *  - The pointer to the context of a KNI interface.
 129  *  - NULL indicate error.
 130  */
 131 struct rte_kni *rte_kni_alloc(struct rte_mempool *pktmbuf_pool,
 132                 const struct rte_kni_conf *conf, struct rte_kni_ops *ops);
 133
 134 /**
 135  * Release KNI interface according to the context. It will also release the
 136  * paired KNI interface in kernel space. All processing on the specific KNI
 137  * context need to be stopped before calling this interface.
 138  *
 139  * rte_kni_release is thread safe.
 140  *
 141  * @param kni
 142  *  The pointer to the context of an existent KNI interface.
 143  *
 144  * @return
 145  *  - 0 indicates success.
 146  *  - negative value indicates failure.
 147  */
 148 int rte_kni_release(struct rte_kni *kni);
 149
 150 /**
 151  * It is used to handle the request mbufs sent from kernel space.
 152  * Then analyzes it and calls the specific actions for the specific requests.
 153  * Finally constructs the response mbuf and puts it back to the resp_q.
 154  *
 155  * @param kni
 156  *  The pointer to the context of an existent KNI interface.
 157  *
 158  * @return
 159  *  - 0
 160  *  - negative value indicates failure.
 161  */
 162 int rte_kni_handle_request(struct rte_kni *kni);
 163
 164 /**
 165  * Retrieve a burst of packets from a KNI interface. The retrieved packets are
 166  * stored in rte_mbuf structures whose pointers are supplied in the array of
 167  * mbufs, and the maximum number is indicated by num. It handles allocating
 168  * the mbufs for KNI interface alloc queue.
 169  *
 170  * @param kni
 171  *  The KNI interface context.
 172  * @param mbufs
 173  *  The array to store the pointers of mbufs.
 174  * @param num
 175  *  The maximum number per burst.
 176  *
 177  * @return
 178  *  The actual number of packets retrieved.
 179  */
 180 unsigned rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs,
 181                 unsigned num);
 182
 183 /**
 184  * Send a burst of packets to a KNI interface. The packets to be sent out are
 185  * stored in rte_mbuf structures whose pointers are supplied in the array of
 186  * mbufs, and the maximum number is indicated by num. It handles the freeing of
 187  * the mbufs in the free queue of KNI interface.
 188  *
 189  * @param kni
 190  *  The KNI interface context.
 191  * @param mbufs
 192  *  The array to store the pointers of mbufs.
 193  * @param num
 194  *  The maximum number per burst.
 195  *
 196  * @return
 197  *  The actual number of packets sent.
 198  */
 199 unsigned rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs,
 200                 unsigned num);
 201
 202 /**
 203  * Get the KNI context of its name.
 204  *
 205  * @param name
 206  *  pointer to the KNI device name.
 207  *
 208  * @return
 209  *  On success: Pointer to KNI interface.
 210  *  On failure: NULL.
 211  */
 212 struct rte_kni *rte_kni_get(const char *name);
 213
 214 /**
 215  * Get the name given to a KNI device
 216  *
 217  * @param kni
 218  *   The KNI instance to query
 219  * @return
 220  *   The pointer to the KNI name
 221  */
 222 const char *rte_kni_get_name(const struct rte_kni *kni);
 223
 224 /**
 225  * Register KNI request handling for a specified port,and it can
 226  * be called by master process or slave process.
 227  *
 228  * @param kni
 229  *  pointer to struct rte_kni.
 230  * @param ops
 231  *  ponter to struct rte_kni_ops.
 232  *
 233  * @return
 234  *  On success: 0
 235  *  On failure: -1
 236  */
 237 int rte_kni_register_handlers(struct rte_kni *kni, struct rte_kni_ops *ops);
 238
 239 /**
 240  *  Unregister KNI request handling for a specified port.
 241  *
 242  *  @param kni
 243  *   pointer to struct rte_kni.
 244  *
 245  *  @return
 246  *   On success: 0
 247  *   On failure: -1
 248  */
 249 int rte_kni_unregister_handlers(struct rte_kni *kni);
 250
 251 /**
 252  *  Close KNI device.
 253  */
 254 void rte_kni_close(void);
 255
 256 #ifdef __cplusplus
 257 }
 258 #endif
 259
 260 #endif /* _RTE_KNI_H_ */