linux-kernel - [PATCH net-next] page_pool: Clamp ring size to 32K

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Message-ID: <20230807034932.4000598-1-rkannoth@marvell.com>
Date:   Mon, 7 Aug 2023 09:19:32 +0530
From:   Ratheesh Kannoth <rkannoth@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, Ratheesh Kannoth <rkannoth@...vell.com>
Subject: [PATCH net-next] page_pool: Clamp ring size to 32K

https://lore.kernel.org/netdev/20230804133512.4dbbbc16@kernel.org/T/
Capping the recycle ring to 32k instead of returning the error.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Ratheesh Kannoth <rkannoth@...vell.com>
---
 net/core/page_pool.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 5d615a169718..404f835a94be 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -182,9 +182,9 @@ static int page_pool_init(struct page_pool *pool,
 	if (pool->p.pool_size)
 		ring_qsize = pool->p.pool_size;
 
-	/* Sanity limit mem that can be pinned down */
+	/* Clamp to 32K */
 	if (ring_qsize > 32768)
-		return -E2BIG;
+		ring_qsize = 32768;
 
 	/* DMA direction is either DMA_FROM_DEVICE or DMA_BIDIRECTIONAL.
 	 * DMA_BIDIRECTIONAL is for allowing page used for DMA sending,
-- 
2.25.1