linux-kernel - [PATCH net-next v2 1/7] netpoll: Improve code clarity with explicit struct size calculations

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Message-Id: <20250702-netpoll_untagle_ip-v2-1-13cf3db24e2b@debian.org>
Date: Wed, 02 Jul 2025 03:06:33 -0700
From: Breno Leitao <leitao@...ian.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Andrew Lunn <andrew+netdev@...n.ch>, Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, Breno Leitao <leitao@...ian.org>, 
 kernel-team@...a.com
Subject: [PATCH net-next v2 1/7] netpoll: Improve code clarity with
 explicit struct size calculations

Replace pointer-dereference sizeof() operations with explicit struct names
for improved readability and maintainability. This change:

1. Replaces `sizeof(*udph)` with `sizeof(struct udphdr)`
2. Replaces `sizeof(*ip6h)` with `sizeof(struct ipv6hdr)`
3. Replaces `sizeof(*iph)` with `sizeof(struct iphdr)`

This will make it easy to move code in the upcoming patches.

No functional changes are introduced by this patch.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 net/core/netpoll.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 54f9d505895f6..ac0ae9630654a 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -402,11 +402,11 @@ int netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
 		WARN_ON_ONCE(!irqs_disabled());

-	udp_len = len + sizeof(*udph);
+	udp_len = len + sizeof(struct udphdr);
 	if (np->ipv6)
-		ip_len = udp_len + sizeof(*ip6h);
+		ip_len = udp_len + sizeof(struct ipv6hdr);
 	else
-		ip_len = udp_len + sizeof(*iph);
+		ip_len = udp_len + sizeof(struct iphdr);

 	total_len = ip_len + LL_RESERVED_SPACE(np->dev);

@@ -418,7 +418,7 @@ int netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 	skb_copy_to_linear_data(skb, msg, len);
 	skb_put(skb, len);

-	skb_push(skb, sizeof(*udph));
+	skb_push(skb, sizeof(struct udphdr));
 	skb_reset_transport_header(skb);
 	udph = udp_hdr(skb);
 	udph->source = htons(np->local_port);
@@ -434,7 +434,7 @@ int netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 		if (udph->check == 0)
 			udph->check = CSUM_MANGLED_0;

-		skb_push(skb, sizeof(*ip6h));
+		skb_push(skb, sizeof(struct ipv6hdr));
 		skb_reset_network_header(skb);
 		ip6h = ipv6_hdr(skb);

@@ -461,7 +461,7 @@ int netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 		if (udph->check == 0)
 			udph->check = CSUM_MANGLED_0;

-		skb_push(skb, sizeof(*iph));
+		skb_push(skb, sizeof(struct iphdr));
 		skb_reset_network_header(skb);
 		iph = ip_hdr(skb);

-- 
2.47.1