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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* 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 Intel Corporation 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_IVSHMEM_H_
#define RTE_IVSHMEM_H_
#include <rte_memzone.h>
#include <rte_mempool.h>
/**
* @file
*
* The RTE IVSHMEM interface provides functions to create metadata files
* describing memory segments to be shared via QEMU IVSHMEM.
*/
#ifdef __cplusplus
extern "C" {
#endif
#define IVSHMEM_MAGIC 0x0BADC0DE
#define IVSHMEM_NAME_LEN 32
/**
* Structure that holds IVSHMEM shared metadata entry.
*/
struct rte_ivshmem_metadata_entry {
struct rte_memzone mz; /**< shared memzone */
uint64_t offset; /**< offset of memzone within IVSHMEM device */
};
/**
* Structure that holds IVSHMEM metadata.
*/
struct rte_ivshmem_metadata {
int magic_number; /**< magic number */
char name[IVSHMEM_NAME_LEN]; /**< name of the metadata file */
struct rte_ivshmem_metadata_entry entry[RTE_LIBRTE_IVSHMEM_MAX_ENTRIES];
/**< metadata entries */
};
/**
* Creates metadata file with a given name
*
* @param name
* Name of metadata file to be created
*
* @return
* - On success, zero
* - On failure, a negative value
*/
int rte_ivshmem_metadata_create(const char * name);
/**
* Adds memzone to a specific metadata file
*
* @param mz
* Memzone to be added
* @param md_name
* Name of metadata file for the memzone to be added to
*
* @return
* - On success, zero
* - On failure, a negative value
*/
int rte_ivshmem_metadata_add_memzone(const struct rte_memzone * mz,
const char * md_name);
/**
* Adds a ring descriptor to a specific metadata file
*
* @param r
* Ring descriptor to be added
* @param md_name
* Name of metadata file for the ring to be added to
*
* @return
* - On success, zero
* - On failure, a negative value
*/
int rte_ivshmem_metadata_add_ring(const struct rte_ring * r,
const char * md_name);
/**
* Adds a mempool to a specific metadata file
*
* @param mp
* Mempool to be added
* @param md_name
* Name of metadata file for the mempool to be added to
*
* @return
* - On success, zero
* - On failure, a negative value
*/
int rte_ivshmem_metadata_add_mempool(const struct rte_mempool * mp,
const char * md_name);
/**
* Generates the QEMU command-line for IVSHMEM device for a given metadata file.
* This function is to be called after all the objects were added.
*
* @param buffer
* Buffer to be filled with the command line arguments.
* @param size
* Size of the buffer.
* @param name
* Name of metadata file to generate QEMU command-line parameters for
*
* @return
* - On success, zero
* - On failure, a negative value
*/
int rte_ivshmem_metadata_cmdline_generate(char *buffer, unsigned size,
const char *name);
/**
* Dump all metadata entries from a given metadata file to the console.
*
* @param f
* A pointer to a file for output
* @name
* Name of the metadata file to be dumped to console.
*/
void rte_ivshmem_metadata_dump(FILE *f, const char *name);
#ifdef __cplusplus
}
#endif
#endif /* RTE_IVSHMEM_H_ */
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