rte_dev.h

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/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2014 6WIND S.A.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of 6WIND S.A. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_DEV_H_
#define _RTE_DEV_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#include <sys/queue.h>

#include <rte_log.h>

__attribute__((format(printf, 2, 0)))
static inline void
rte_pmd_debug_trace(const char *func_name, const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);

        char buffer[vsnprintf(NULL, 0, fmt, ap) + 1];

        va_end(ap);

        va_start(ap, fmt);
        vsnprintf(buffer, sizeof(buffer), fmt, ap);
        va_end(ap);

        rte_log(RTE_LOG_ERR, RTE_LOGTYPE_PMD, "%s: %s", func_name, buffer);
}

/* Macros for checking for restricting functions to primary instance only */
#define RTE_PROC_PRIMARY_OR_ERR_RET(retval) do { \
        if (rte_eal_process_type() != RTE_PROC_PRIMARY) { \
                RTE_PMD_DEBUG_TRACE("Cannot run in secondary processes\n"); \
                return retval; \
        } \
} while (0)

#define RTE_PROC_PRIMARY_OR_RET() do { \
        if (rte_eal_process_type() != RTE_PROC_PRIMARY) { \
                RTE_PMD_DEBUG_TRACE("Cannot run in secondary processes\n"); \
                return; \
        } \
} while (0)

/* Macros to check for invalid function pointers */
#define RTE_FUNC_PTR_OR_ERR_RET(func, retval) do { \
        if ((func) == NULL) { \
                RTE_PMD_DEBUG_TRACE("Function not supported\n"); \
                return retval; \
        } \
} while (0)

#define RTE_FUNC_PTR_OR_RET(func) do { \
        if ((func) == NULL) { \
                RTE_PMD_DEBUG_TRACE("Function not supported\n"); \
                return; \
        } \
} while (0)


TAILQ_HEAD(rte_driver_list, rte_driver);

typedef int (rte_dev_init_t)(const char *name, const char *args);

typedef int (rte_dev_uninit_t)(const char *name);

enum pmd_type {
        PMD_VDEV = 0,
        PMD_PDEV = 1,
};

struct rte_driver {
        TAILQ_ENTRY(rte_driver) next;  
        enum pmd_type type;                
        const char *name;                   
        rte_dev_init_t *init;              
        rte_dev_uninit_t *uninit;          
};

void rte_eal_driver_register(struct rte_driver *driver);

void rte_eal_driver_unregister(struct rte_driver *driver);

int rte_eal_dev_init(void);

int rte_eal_vdev_init(const char *name, const char *args);

int rte_eal_vdev_uninit(const char *name);

#define DRIVER_EXPORT_NAME_ARRAY(n, idx) n##idx[]

#define DRIVER_EXPORT_NAME(name, idx) \
static const char DRIVER_EXPORT_NAME_ARRAY(this_pmd_name, idx) \
__attribute__((used)) = RTE_STR(name)

#define PMD_REGISTER_DRIVER(drv, nm)\
void devinitfn_ ##drv(void);\
void __attribute__((constructor, used)) devinitfn_ ##drv(void)\
{\
        (drv).name = RTE_STR(nm);\
        rte_eal_driver_register(&drv);\
} \
DRIVER_EXPORT_NAME(nm, __COUNTER__)

#define DRV_EXP_TAG(name, tag) __##name##_##tag

#define DRIVER_REGISTER_PCI_TABLE(name, table) \
static const char DRV_EXP_TAG(name, pci_tbl_export)[] __attribute__((used)) = \
RTE_STR(table)

#define DRIVER_REGISTER_PARAM_STRING(name, str) \
static const char DRV_EXP_TAG(name, param_string_export)[] \
__attribute__((used)) = str

#ifdef __cplusplus
}
#endif

#endif /* _RTE_VDEV_H_ */