netdev - [PATCH net-next v4 04/13] net: page_pool: stash the NAPI ID for easier access

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Message-ID: <20231126230740.2148636-5-kuba@kernel.org>
Date: Sun, 26 Nov 2023 15:07:31 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	dsahern@...il.com,
	dtatulea@...dia.com,
	willemb@...gle.com,
	almasrymina@...gle.com,
	shakeelb@...gle.com,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v4 04/13] net: page_pool: stash the NAPI ID for easier access

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@...gle.com>
Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 include/net/page_pool/types.h | 1 +
 net/core/page_pool_user.c     | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index b258a571201e..7e47d7bb2c1e 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -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;
 };
diff --git a/net/core/page_pool_user.c b/net/core/page_pool_user.c
index e5c7f078fbd4..2888aa8dd3e4 100644
--- a/net/core/page_pool_user.c
+++ b/net/core/page_pool_user.c
@@ -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;
-- 
2.42.0