int os_mbuf_pool_init(struct os_mbuf_pool *omp, struct os_mempool *mp, uint16_t buf_len, uint16_t nbufs)
Initialize an mbuf pool
| Arguments | Description |
|---|---|
| omp | Pointer to mbuf pool to initialize |
| mp | Pointer to memory pool used by mbuf pool |
| buf_len | The size of the memory blocks in the memory pool used by the mbuf pool |
| nbufs | The number of mbufs in the pool |
0 on success; all other values indicate an error.
The parameter buf_len is the total size of the memory block. This must accommodate the os_mbuf structure, the os_mbuf_pkthdr structure, any user headers plus the desired amount of user data.
#define MBUF_PKTHDR_OVERHEAD sizeof(struct os_mbuf_pkthdr) + sizeof(struct user_hdr) #define MBUF_MEMBLOCK_OVERHEAD sizeof(struct os_mbuf) + MBUF_PKTHDR_OVERHEAD #define MBUF_NUM_MBUFS (32) #define MBUF_PAYLOAD_SIZE (64) #define MBUF_BUF_SIZE OS_ALIGN(MBUF_PAYLOAD_SIZE, 4) #define MBUF_MEMBLOCK_SIZE (MBUF_BUF_SIZE + MBUF_MEMBLOCK_OVERHEAD) #define MBUF_MEMPOOL_SIZE OS_MEMPOOL_SIZE(MBUF_NUM_MBUFS, MBUF_MEMBLOCK_SIZE) struct os_mbuf_pool g_mbuf_pool; struct os_mempool g_mbuf_mempool; os_membuf_t g_mbuf_buffer[MBUF_MEMPOOL_SIZE]; void create_mbuf_pool(void) { int rc; rc = os_mempool_init(&g_mbuf_mempool, MBUF_NUM_MBUFS, MBUF_MEMBLOCK_SIZE, &g_mbuf_buffer[0], "mbuf_pool"); assert(rc == 0); rc = os_mbuf_pool_init(&g_mbuf_pool, &g_mbuf_mempool, MBUF_MEMBLOCK_SIZE, MBUF_NUM_MBUFS); assert(rc == 0); }