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net: page_pool: stash the NAPI ID for easier access

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To avoid any issues with race conditions on accessing napi
and having to think about the lifetime of NAPI objects
in netlink GET - stash the napi_id to which page pool
was linked at creation time.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski 2023-11-26 15:07:31 -08:00 committed by Paolo Abeni
parent 083772c9f9
commit 02b3de80c5
2 changed files with 4 additions and 1 deletions
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1
include/net/page_pool/types.h
View file

@ -193,6 +193,7 @@ struct page_pool {
/* User-facing fields, protected by page_pools_lock */
struct {
struct hlist_node list;
u32 napi_id;
u32 id;
} user;
};

4
net/core/page_pool_user.c
View file

@ -37,9 +37,11 @@ int page_pool_list(struct page_pool *pool)
if (err < 0)
goto err_unlock;
if (pool->slow.netdev)
if (pool->slow.netdev) {
hlist_add_head(&pool->user.list,
&pool->slow.netdev->page_pools);
pool->user.napi_id = pool->p.napi ? pool->p.napi->napi_id : 0;
}
mutex_unlock(&page_pools_lock);
return 0;