linux-kernel - Re: [PATCH net-next v4 4/4] net: gro: move L3 flush checks to tcp_gro

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Message-ID: <20240325193338.565a4e45@kernel.org>
Date: Mon, 25 Mar 2024 19:33:38 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Richard Gobert <richardbgobert@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 willemdebruijn.kernel@...il.com, dsahern@...nel.org, xeb@...l.ru,
 shuah@...nel.org, idosch@...dia.com, amcohen@...dia.com, petrm@...dia.com,
 jbenc@...hat.com, bpoirier@...dia.com, b.galvani@...il.com,
 liujian56@...wei.com, horms@...nel.org, linyunsheng@...wei.com,
 therbert@...gle.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next v4 4/4] net: gro: move L3 flush checks to
 tcp_gro_receive

On Mon, 25 Mar 2024 19:25:43 +0100 Richard Gobert wrote:
> +	const u32 id = ntohl(*(__be32 *)&iph->id);
> +	const u32 id2 = ntohl(*(__be32 *)&iph2->id);
> +	const int flush_id = ntohs(id >> 16) - ntohs(id2 >> 16);

The endian conversions don't match types here. sparse is unhappy.
If id is in host endian shouldn't it be htons(id >> 16) ?
Also if you cast to a bitwise type you need __force
-- 
pw-bot: cr