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page_pool: introduce page_pool_free and use in mlx5 

In case driver fails to register the page_pool with XDP return API (via
xdp_rxq_info_reg_mem_model()), then the driver can free the page_pool
resources more directly than calling page_pool_destroy(), which does a
unnecessarily RCU free procedure.

This patch is preparing for removing page_pool_destroy(), from driver
invocation.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2019-06-18 15:05:37 +02:00 committed by David S. Miller
parent cbf3351067
commit e54cfd7e17
3 changed files with 25 additions and 7 deletions
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6
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -545,8 +545,10 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
}
err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,
MEM_TYPE_PAGE_POOL, rq->page_pool);
if (err)
if (err) {
page_pool_free(rq->page_pool);
goto err_free;
}
for (i = 0; i < wq_sz; i++) {
if (rq->wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ) {
@ -611,8 +613,6 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
if (rq->xdp_prog)
bpf_prog_put(rq->xdp_prog);
xdp_rxq_info_unreg(&rq->xdp_rxq);
if (rq->page_pool)
page_pool_destroy(rq->page_pool);
mlx5_wq_destroy(&rq->wq_ctrl);
return err;

11
include/net/page_pool.h
View File

@ -111,6 +111,17 @@ struct page_pool *page_pool_create(const struct page_pool_params *params);
void page_pool_destroy(struct page_pool *pool);
void __page_pool_free(struct page_pool *pool);
static inline void page_pool_free(struct page_pool *pool)
{
/* When page_pool isn't compiled-in, net/core/xdp.c doesn't
* allow registering MEM_TYPE_PAGE_POOL, but shield linker.
*/
#ifdef CONFIG_PAGE_POOL
__page_pool_free(pool);
#endif
}
/* Never call this directly, use helpers below */
void __page_pool_put_page(struct page_pool *pool,
struct page *page, bool allow_direct);

15
net/core/page_pool.c
View File

@ -292,17 +292,24 @@ static void __page_pool_empty_ring(struct page_pool *pool)
}
}
void __page_pool_free(struct page_pool *pool)
{
WARN(pool->alloc.count, "API usage violation");
WARN(!ptr_ring_empty(&pool->ring), "ptr_ring is not empty");
ptr_ring_cleanup(&pool->ring, NULL);
kfree(pool);
}
EXPORT_SYMBOL(__page_pool_free);
static void __page_pool_destroy_rcu(struct rcu_head *rcu)
{
struct page_pool *pool;
pool = container_of(rcu, struct page_pool, rcu);
WARN(pool->alloc.count, "API usage violation");
__page_pool_empty_ring(pool);
ptr_ring_cleanup(&pool->ring, NULL);
kfree(pool);
__page_pool_free(pool);
}
/* Cleanup and release resources */