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From: Jeremy Kerr <jk@codeconstruct.com.au>
To: Paolo Abeni <pabeni@redhat.com>,
	Matt Johnston <matt@codeconstruct.com.au>,
	 "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Simon Horman <horms@kernel.org>
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH net-next 1/3] net: mctp: perform source address lookups when we populate our dst
Date: Thu, 02 Apr 2026 19:48:29 +0800	[thread overview]
Message-ID: <f3d485e57d89b9939b1930eb7310db78f47d1756.camel@codeconstruct.com.au> (raw)
In-Reply-To: <05c7a9b4-9874-42e6-acae-a5d66d33428f@redhat.com>

Hi Pablo,

> > Rather than querying the output device for its address in
> > mctp_local_output, set up the source address when we're populating the
> > dst structure. If no address is assigned, use MCTP_ADDR_NULL.
> > 
> > This will allow us more flexibility when routing for NULL-source-eid
> > cases. For now though, we still reject a NULL source address in the
> > output path.
> > 
> > We need to update the tests a little, so that addresses are assigned
> > before we do the dst lookups.
> > 
> > Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
> 
> Sashiko pointed to a possible pre-existent issue:
> 
> https://sashiko.dev/#/patchset/20260331-dev-mctp-null-eids-v1-0-b4d047372eaf%40codeconstruct.com.au
> 
> please have a look and follow-up if needed.

Yes, I've just been checking that out this afternoon. While there's
nothing pressing there (the findings are somewhat valid, but don't
affect any typical behaviour), I think it's worth a fix.

Given the merge to net-next, I assume a patch on top of the series is in
order, but let me know if you'd like something else.

Cheers,


Jeremy

  reply	other threads:[~2026-04-02 11:48 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-31  7:41 [PATCH net-next 0/3] net: mctp: improvements for NULL-EID addressing Jeremy Kerr
2026-03-31  7:41 ` [PATCH net-next 1/3] net: mctp: perform source address lookups when we populate our dst Jeremy Kerr
2026-04-02 11:30   ` Paolo Abeni
2026-04-02 11:48     ` Jeremy Kerr [this message]
2026-03-31  7:41 ` [PATCH net-next 2/3] net: mctp: allow local TX with no address assigned Jeremy Kerr
2026-03-31  7:41 ` [PATCH net-next 3/3] net: mctp: don't require a route for null-EID ingress Jeremy Kerr
2026-04-02 11:40 ` [PATCH net-next 0/3] net: mctp: improvements for NULL-EID addressing patchwork-bot+netdevbpf

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