ceph/src/dpdk/lib/librte_eal/common/include/rte_dev.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2014 6WIND S.A.
   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 6WIND S.A. 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
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _RTE_DEV_H_
  35 #define _RTE_DEV_H_
  36
  37 /**
  38  * @file
  39  *
  40  * RTE PMD Driver Registration Interface
  41  *
  42  * This file manages the list of device drivers.
  43  */
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 #include <stdio.h>
  50 #include <sys/queue.h>
  51
  52 #include <rte_log.h>
  53
  54 __attribute__((format(printf, 2, 0)))
  55 static inline void
  56 rte_pmd_debug_trace(const char *func_name, const char *fmt, ...)
  57 {
  58         va_list ap;
  59
  60         va_start(ap, fmt);
  61
  62         char buffer[vsnprintf(NULL, 0, fmt, ap) + 1];
  63
  64         va_end(ap);
  65
  66         va_start(ap, fmt);
  67         vsnprintf(buffer, sizeof(buffer), fmt, ap);
  68         va_end(ap);
  69
  70         rte_log(RTE_LOG_ERR, RTE_LOGTYPE_PMD, "%s: %s", func_name, buffer);
  71 }
  72
  73 /* Macros for checking for restricting functions to primary instance only */
  74 #define RTE_PROC_PRIMARY_OR_ERR_RET(retval) do { \
  75         if (rte_eal_process_type() != RTE_PROC_PRIMARY) { \
  76                 RTE_PMD_DEBUG_TRACE("Cannot run in secondary processes\n"); \
  77                 return retval; \
  78         } \
  79 } while (0)
  80
  81 #define RTE_PROC_PRIMARY_OR_RET() do { \
  82         if (rte_eal_process_type() != RTE_PROC_PRIMARY) { \
  83                 RTE_PMD_DEBUG_TRACE("Cannot run in secondary processes\n"); \
  84                 return; \
  85         } \
  86 } while (0)
  87
  88 /* Macros to check for invalid function pointers */
  89 #define RTE_FUNC_PTR_OR_ERR_RET(func, retval) do { \
  90         if ((func) == NULL) { \
  91                 RTE_PMD_DEBUG_TRACE("Function not supported\n"); \
  92                 return retval; \
  93         } \
  94 } while (0)
  95
  96 #define RTE_FUNC_PTR_OR_RET(func) do { \
  97         if ((func) == NULL) { \
  98                 RTE_PMD_DEBUG_TRACE("Function not supported\n"); \
  99                 return; \
 100         } \
 101 } while (0)
 102
 103 /**
 104  * A generic memory resource representation.
 105  */
 106 struct rte_mem_resource {
 107         uint64_t phys_addr; /**< Physical address, 0 if not resource. */
 108         uint64_t len;       /**< Length of the resource. */
 109         void *addr;         /**< Virtual address, NULL when not mapped. */
 110 };
 111
 112 /** Double linked list of device drivers. */
 113 TAILQ_HEAD(rte_driver_list, rte_driver);
 114 /** Double linked list of devices. */
 115 TAILQ_HEAD(rte_device_list, rte_device);
 116
 117 /* Forward declaration */
 118 struct rte_driver;
 119
 120 /**
 121  * A structure describing a generic device.
 122  */
 123 struct rte_device {
 124         TAILQ_ENTRY(rte_device) next; /**< Next device */
 125         struct rte_driver *driver;    /**< Associated driver */
 126         int numa_node;                /**< NUMA node connection */
 127         struct rte_devargs *devargs;  /**< Device user arguments */
 128 };
 129
 130 /**
 131  * Insert a device detected by a bus scanning.
 132  *
 133  * @param dev
 134  *   A pointer to a rte_device structure describing the detected device.
 135  */
 136 void rte_eal_device_insert(struct rte_device *dev);
 137
 138 /**
 139  * Remove a device (e.g. when being unplugged).
 140  *
 141  * @param dev
 142  *   A pointer to a rte_device structure describing the device to be removed.
 143  */
 144 void rte_eal_device_remove(struct rte_device *dev);
 145
 146 /**
 147  * A structure describing a device driver.
 148  */
 149 struct rte_driver {
 150         TAILQ_ENTRY(rte_driver) next;  /**< Next in list. */
 151         const char *name;                   /**< Driver name. */
 152         const char *alias;              /**< Driver alias. */
 153 };
 154
 155 /**
 156  * Register a device driver.
 157  *
 158  * @param driver
 159  *   A pointer to a rte_dev structure describing the driver
 160  *   to be registered.
 161  */
 162 void rte_eal_driver_register(struct rte_driver *driver);
 163
 164 /**
 165  * Unregister a device driver.
 166  *
 167  * @param driver
 168  *   A pointer to a rte_dev structure describing the driver
 169  *   to be unregistered.
 170  */
 171 void rte_eal_driver_unregister(struct rte_driver *driver);
 172
 173 /**
 174  * Initalize all the registered drivers in this process
 175  */
 176 int rte_eal_dev_init(void);
 177
 178 /**
 179  * Initialize a driver specified by name.
 180  *
 181  * @param name
 182  *   The pointer to a driver name to be initialized.
 183  * @param args
 184  *   The pointer to arguments used by driver initialization.
 185  * @return
 186  *  0 on success, negative on error
 187  */
 188 int rte_eal_vdev_init(const char *name, const char *args);
 189
 190 /**
 191  * Uninitalize a driver specified by name.
 192  *
 193  * @param name
 194  *   The pointer to a driver name to be initialized.
 195  * @return
 196  *  0 on success, negative on error
 197  */
 198 int rte_eal_vdev_uninit(const char *name);
 199
 200 /**
 201  * Attach a device to a registered driver.
 202  *
 203  * @param name
 204  *   The device name, that refers to a pci device (or some private
 205  *   way of designating a vdev device). Based on this device name, eal
 206  *   will identify a driver capable of handling it and pass it to the
 207  *   driver probing function.
 208  * @param devargs
 209  *   Device arguments to be passed to the driver.
 210  * @return
 211  *   0 on success, negative on error.
 212  */
 213 int rte_eal_dev_attach(const char *name, const char *devargs);
 214
 215 /**
 216  * Detach a device from its driver.
 217  *
 218  * @param name
 219  *   Same description as for rte_eal_dev_attach().
 220  *   Here, eal will call the driver detaching function.
 221  * @return
 222  *   0 on success, negative on error.
 223  */
 224 int rte_eal_dev_detach(const char *name);
 225
 226 #define RTE_PMD_EXPORT_NAME_ARRAY(n, idx) n##idx[]
 227
 228 #define RTE_PMD_EXPORT_NAME(name, idx) \
 229 static const char RTE_PMD_EXPORT_NAME_ARRAY(this_pmd_name, idx) \
 230 __attribute__((used)) = RTE_STR(name)
 231
 232 #define DRV_EXP_TAG(name, tag) __##name##_##tag
 233
 234 #define RTE_PMD_REGISTER_PCI_TABLE(name, table) \
 235 static const char DRV_EXP_TAG(name, pci_tbl_export)[] __attribute__((used)) = \
 236 RTE_STR(table)
 237
 238 #define RTE_PMD_REGISTER_PARAM_STRING(name, str) \
 239 static const char DRV_EXP_TAG(name, param_string_export)[] \
 240 __attribute__((used)) = str
 241
 242 #ifdef __cplusplus
 243 }
 244 #endif
 245
 246 #endif /* _RTE_VDEV_H_ */