linux-kernel - Re: [PATCH net] rxrpc: Fix use of Don't Fragment flag

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Date: Tue, 09 Jan 2024 14:16:17 +0000
From: David Howells <dhowells@...hat.com>
To: Marc Dionne <marc.dionne@...istor.com>
Cc: dhowells@...hat.com, "David S. Miller" <davem@...emloft.net>,
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
    Paolo Abeni <pabeni@...hat.com>, linux-afs@...ts.infradead.org,
    netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] rxrpc: Fix use of Don't Fragment flag

Marc Dionne <marc.dionne@...istor.com> wrote:

> > +{
> > +       if (set)
> > +               ip_sock_set_mtu_discover(local->socket->sk, IP_PMTUDISC_DONT);
> > +       else
> > +               ip_sock_set_mtu_discover(local->socket->sk, IP_PMTUDISC_DO);
> > +}
> 
> Shouldn't those be reversed - don't fragment should be IP_PMTUDISC_DO?

Meh.  Yes.

> Also, and this is probably already an issue with current code, I don't
> think this is effective if the socket is V6, which it will be in most
> cases.

Hmmm...  I guess I should tweak IPV6_MTU_DISCOVER also.

David