linux-kernel - [PATCH AUTOSEL 4.19 3/6] net: ethernet: use ip

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Message-ID: <20241012113009.1764620-3-sashal@kernel.org>
Date: Sat, 12 Oct 2024 07:30:00 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Moon Yeounsu <yyyynoom@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>,
	cooldavid@...ldavid.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	sd@...asysnail.net,
	horms@...nel.org,
	jacob.e.keller@...el.com,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 3/6] net: ethernet: use ip_hdrlen() instead of bit shift

From: Moon Yeounsu <yyyynoom@...il.com>

[ Upstream commit 9a039eeb71a42c8b13408a1976e300f3898e1be0 ]

`ip_hdr(skb)->ihl << 2` is the same as `ip_hdrlen(skb)`
Therefore, we should use a well-defined function not a bit shift
to find the header length.

It also compresses two lines to a single line.

Signed-off-by: Moon Yeounsu <yyyynoom@...il.com>
Reviewed-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/jme.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/jme.c b/drivers/net/ethernet/jme.c
index a5ab6f3403ae0..9b2471b2a9559 100644
--- a/drivers/net/ethernet/jme.c
+++ b/drivers/net/ethernet/jme.c
@@ -966,15 +966,13 @@ jme_udpsum(struct sk_buff *skb)
 	if (skb->protocol != htons(ETH_P_IP))
 		return csum;
 	skb_set_network_header(skb, ETH_HLEN);
-	if ((ip_hdr(skb)->protocol != IPPROTO_UDP) ||
-	    (skb->len < (ETH_HLEN +
-			(ip_hdr(skb)->ihl << 2) +
-			sizeof(struct udphdr)))) {
+
+	if (ip_hdr(skb)->protocol != IPPROTO_UDP ||
+	    skb->len < (ETH_HLEN + ip_hdrlen(skb) + sizeof(struct udphdr))) {
 		skb_reset_network_header(skb);
 		return csum;
 	}
-	skb_set_transport_header(skb,
-			ETH_HLEN + (ip_hdr(skb)->ihl << 2));
+	skb_set_transport_header(skb, ETH_HLEN + ip_hdrlen(skb));
 	csum = udp_hdr(skb)->check;
 	skb_reset_transport_header(skb);
 	skb_reset_network_header(skb);
-- 
2.43.0