From: David Gibson <david@gibson.dropbear.id.au>
To: Laurent Vivier <lvivier@redhat.com>
Cc: passt-dev@passt.top
Subject: Re: [PATCH] vhost_user: Offer VIRTIO_NET_F_GUEST_CSUM
Date: Tue, 24 Mar 2026 09:41:55 +1100 [thread overview]
Message-ID: <acHBs7UTOyNZjta2@zatzit> (raw)
In-Reply-To: <e640dd07-d37e-48bf-86fc-5adde963c4ea@redhat.com>
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On Mon, Mar 23, 2026 at 07:15:36PM +0100, Laurent Vivier wrote:
> On 3/23/26 19:01, Laurent Vivier wrote:
> > iPXE, however, does not negotiate GUEST_CSUM, ignores the DATA_VALID
> > flag entirely, and always verifies checksums. This caused TCP
> > connections to fail: the SYN-ACK had a zero TCP checksum, iPXE rejected
> > it, and the connection timed out in SYN_RCVD.
>
> And if you're wondering who's behind this laziness, check the author's name...
>
> https://gitlab.com/qemu-project/ipxe/-/blob/master/src/drivers/net/virtio-net.c?ref_type=heads#L8
Aw man, not that guy!
--
David Gibson (he or they) | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you, not the other way
| around.
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2026-03-23 22:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 18:01 Laurent Vivier
2026-03-23 18:15 ` Laurent Vivier
2026-03-23 22:41 ` David Gibson [this message]
2026-03-23 22:40 ` David Gibson
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