linux-kernel - Re: [PATCH v2 net-next] ipv6: avoid atomic fragment on GSO packets

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Message-ID: <20231017200207.GA5770@breakpoint.cc>
Date:   Tue, 17 Oct 2023 22:02:07 +0200
From:   Florian Westphal <fw@...len.de>
To:     Yan Zhai <yan@...udflare.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Aya Levin <ayal@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>, linux-kernel@...r.kernel.org,
        kernel-team@...udflare.com, Florian Westphal <fw@...len.de>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH v2 net-next] ipv6: avoid atomic fragment on GSO packets

Yan Zhai <yan@...udflare.com> wrote:
> Refactor __ip6_finish_output code to separate GSO and non-GSO packet
> processing. It mirrors __ip_finish_output logic now. Add an extra check
> in GSO handling to avoid atomic fragments. Lastly, drop dst_allfrag
> check, which is no longer true since commit 9d289715eb5c ("ipv6: stop
> sending PTB packets for MTU < 1280").
 

> -	if ((skb->len > mtu && !skb_is_gso(skb)) ||
> -	    dst_allfrag(skb_dst(skb)) ||

My preference is to first remove dst_allfrag, i.e. do this in
a separate change.