From: Laurent Vivier <lvivier@redhat.com>
To: passt-dev@passt.top
Subject: Re: [PATCH] vhost_user: Offer VIRTIO_NET_F_GUEST_CSUM
Date: Mon, 23 Mar 2026 19:15:36 +0100 [thread overview]
Message-ID: <e640dd07-d37e-48bf-86fc-5adde963c4ea@redhat.com> (raw)
In-Reply-To: <20260323180149.1268399-1-lvivier@redhat.com>
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
Thanks,
Laurent
next prev parent reply other threads:[~2026-03-23 18:15 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 [this message]
2026-03-23 22:41 ` David Gibson
2026-03-23 22:40 ` David Gibson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=e640dd07-d37e-48bf-86fc-5adde963c4ea@redhat.com \
--to=lvivier@redhat.com \
--cc=passt-dev@passt.top \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://passt.top/passt
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for IMAP folder(s).