linux-kernel - [PATCH net v1 1/2] page_pool: expose max page pool ring size

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Message-ID: <20251105200801.178381-1-almasrymina@google.com>
Date: Wed,  5 Nov 2025 20:07:57 +0000
From: Mina Almasry <almasrymina@...gle.com>
To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Mina Almasry <almasrymina@...gle.com>, Joshua Washington <joshwash@...gle.com>, 
	Harshitha Ramamurthy <hramamurthy@...gle.com>, Andrew Lunn <andrew+netdev@...n.ch>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, 
	Simon Horman <horms@...nel.org>, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net v1 1/2] page_pool: expose max page pool ring size

Expose this as a constant so we can reuse it in drivers.

Signed-off-by: Mina Almasry <almasrymina@...gle.com>
---
 include/net/page_pool/types.h | 2 ++
 net/core/page_pool.c          | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index 1509a536cb85..5edba3122b10 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -58,6 +58,8 @@ struct pp_alloc_cache {
 	netmem_ref cache[PP_ALLOC_CACHE_SIZE];
 };
 
+#define PAGE_POOL_MAX_RING_SIZE 16384
+
 /**
  * struct page_pool_params - page pool parameters
  * @fast:	params accessed frequently on hotpath
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 1a5edec485f1..7b2808da294f 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -211,7 +211,7 @@ static int page_pool_init(struct page_pool *pool,
 		return -EINVAL;
 
 	if (pool->p.pool_size)
-		ring_qsize = min(pool->p.pool_size, 16384);
+		ring_qsize = min(pool->p.pool_size, PAGE_POOL_MAX_RING_SIZE);
 
 	/* DMA direction is either DMA_FROM_DEVICE or DMA_BIDIRECTIONAL.
 	 * DMA_BIDIRECTIONAL is for allowing page used for DMA sending,

base-commit: 327c20c21d80e0d87834b392d83ae73c955ad8ff
-- 
2.51.2.1026.g39e6a42477-goog