Function mlx5_ipool_malloc

dpdk/drivers/net/mlx5/mlx5_utils.c:513–571

}

void *
mlx5_ipool_malloc(struct mlx5_indexed_pool *pool, uint32_t *idx)
{
	struct mlx5_indexed_trunk *trunk;
	uint64_t slab = 0;
	uint32_t iidx = 0;
	void *p;

	if (pool->cfg.per_core_cache)
		return mlx5_ipool_malloc_cache(pool, idx);
	mlx5_ipool_lock(pool);
	if (pool->free_list == TRUNK_INVALID) {
		/* If no available trunks, grow new. */
		if (mlx5_ipool_grow(pool)) {
			mlx5_ipool_unlock(pool);
			return NULL;
		}
	}
	MLX5_ASSERT(pool->free_list != TRUNK_INVALID);
	trunk = pool->trunks[pool->free_list];
	MLX5_ASSERT(trunk->free);
	if (!rte_bitmap_scan(trunk->bmp, &iidx, &slab)) {
		mlx5_ipool_unlock(pool);
		return NULL;
	}
	MLX5_ASSERT(slab);
	iidx += rte_ctz64(slab);
	MLX5_ASSERT(iidx != UINT32_MAX);
	MLX5_ASSERT(iidx < mlx5_trunk_size_get(pool, trunk->idx));
	rte_bitmap_clear(trunk->bmp, iidx);
	p = &trunk->data[iidx * pool->cfg.size];
	/*
	 * The ipool index should grow continually from small to big,
	 * some features as metering only accept limited bits of index.
	 * Random index with MSB set may be rejected.
	 */
	iidx += mlx5_trunk_idx_offset_get(pool, trunk->idx);
	iidx += 1; /* non-zero index. */
	trunk->free--;
#ifdef POOL_DEBUG
	pool->n_entry++;
#endif
	if (!trunk->free) {
		/* Full trunk will be removed from free list in imalloc. */
		MLX5_ASSERT(pool->free_list == trunk->idx);
		pool->free_list = trunk->next;
		if (trunk->next != TRUNK_INVALID)
			pool->trunks[trunk->next]->prev = TRUNK_INVALID;
		trunk->prev = TRUNK_INVALID;
		trunk->next = TRUNK_INVALID;
#ifdef POOL_DEBUG
		pool->trunk_empty++;
		pool->trunk_avail--;
#endif
	}
	*idx = iidx;
	mlx5_ipool_unlock(pool);
	return p;