netdev - [PATCH v1 net] page_pool: Cap queue size to 32k.

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Date: Mon, 14 Aug 2023 11:34:11 +0530
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
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Subject: [PATCH v1 net] page_pool: Cap queue size to 32k.

Clamp to 32k instead of returning error.

Please find discussion at
https://lore.kernel.org/lkml/
CY4PR1801MB1911E15D518A77535F6E51E2D308A@...PR1801MB1911.
namprd18.prod.outlook.com/T/

Fixes: ff7d6b27f894 ("page_pool: refurbish version of page_pool code")
Signed-off-by: Ratheesh Kannoth <rkannoth@...vell.com>

---
ChangeLog:
v0 -> v1: Rebase && commit message changes
---
 net/core/page_pool.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index a3e12a61d456..e9dc8d8966ad 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -171,9 +171,10 @@ 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 */
+	/* Cap queue size 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