linux-kernel - [PATCH net-next v2 6/9] tun: use napi_build_skb in __tun_build

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Message-ID: <20251125200041.1565663-7-jon@nutanix.com>
Date: Tue, 25 Nov 2025 13:00:33 -0700
From: Jon Kohler <jon@...anix.com>
To: netdev@...r.kernel.org, Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Jason Wang <jasowang@...hat.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>,
        linux-kernel@...r.kernel.org (open list)
Cc: Jon Kohler <jon@...anix.com>
Subject: [PATCH net-next v2 6/9] tun: use napi_build_skb in __tun_build_skb

Use napi_build_skb for small payload SKBs that end up using the
tun_build_skb path.

Signed-off-by: Jon Kohler <jon@...anix.com>
---
 drivers/net/tun.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 64f944cce517..27c502786a04 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1538,7 +1538,11 @@ static struct sk_buff *__tun_build_skb(struct tun_file *tfile,
 				       int buflen, int len, int pad,
 				       int metasize)
 {
-	struct sk_buff *skb = build_skb(buf, buflen);
+	struct sk_buff *skb;
+
+	local_bh_disable();
+	skb = napi_build_skb(buf, buflen);
+	local_bh_enable();
 
 	if (!skb)
 		return ERR_PTR(-ENOMEM);
-- 
2.43.0