From: Pavel Begunkov <asml.silence@xxxxxxxxx>
Some page pool memory providers like io_uring need to catch the point
when the page pool is asked to be destroyed. ->destroy is not enough
because it relies on the page pool to wait for its buffers first, but
for that to happen a provider might need to react, e.g. to collect all
buffers that are currently given to the user space.
Add a new provider's scrub callback serving the purpose and called off
the pp's generic (cold) scrubbing path, i.e. page_pool_scrub().
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Signed-off-by: David Wei <dw@xxxxxxxxxxx>
---
include/net/page_pool/types.h | 1 +
net/core/page_pool.c | 3 +++
2 files changed, 4 insertions(+)
diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index 8a35fe474adb..fd0376ad0d26 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -157,6 +157,7 @@ struct memory_provider_ops {
bool (*release_netmem)(struct page_pool *pool, netmem_ref netmem);
int (*init)(struct page_pool *pool);
void (*destroy)(struct page_pool *pool);
+ void (*scrub)(struct page_pool *pool);
};
struct pp_memory_provider_params {
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index c21c5b9edc68..9a675e16e6a4 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -1038,6 +1038,9 @@ static void page_pool_empty_alloc_cache_once(struct page_pool *pool)
static void page_pool_scrub(struct page_pool *pool)
{
+ if (pool->mp_ops && pool->mp_ops->scrub)
+ pool->mp_ops->scrub(pool);
+
page_pool_empty_alloc_cache_once(pool);
pool->destroy_cnt++;
--
2.43.5
