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page_pool: introduce page_pool_free and use in mlx5

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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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15
net/core/page_pool.c
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@@ -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 */