From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: passt.top; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: passt.top; dkim=pass (2048-bit key; secure) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.a=rsa-sha256 header.s=202602 header.b=Q9Ff0yre; dkim-atps=neutral Received: from mail.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) by passt.top (Postfix) with ESMTPS id 446C85A0627 for ; Mon, 23 Mar 2026 23:51:42 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gibson.dropbear.id.au; s=202602; t=1774306292; bh=+K03JZ3kiwvSULobU3GEOhaGjCm0gCGy+jEj2hfLO48=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Q9Ff0yrefSQhy99g2h3mL0NR4ifx/C4p8D9azBg0bob9iUqAmHdAW8/THd//nPCyY KZNZVENlgpEci0wbDppvFUUx3/9lDGQ064rtubQoX5UiF72M5wsjEMv3DoSJboqObH 7+pqz1WFMU5Gc08uxoRGwWKfXPJQ9HYrmibxmL/x2+5zAUhzQ2S24NnuWwpDxa9Eei ky3Qdz7w3gfDQ5xPs2rpY+5c7bB8elZkeizvOHZ2I0hD/cnAVbjHj0cJ4keK/7gQCa p9RW9Wd65FyDGlqhHL7BBffiwOy8B5j+gitgsLGORkJHD67Tov6nZhNJcq1smNxjW5 fVdg3/xDTa/bQ== Received: by gandalf.ozlabs.org (Postfix, from userid 1007) id 4ffpLr6nwMz4wBF; Tue, 24 Mar 2026 09:51:32 +1100 (AEDT) Date: Tue, 24 Mar 2026 09:41:55 +1100 From: David Gibson To: Laurent Vivier Subject: Re: [PATCH] vhost_user: Offer VIRTIO_NET_F_GUEST_CSUM Message-ID: References: <20260323180149.1268399-1-lvivier@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="s3Tji4iN3Xley4cg" Content-Disposition: inline In-Reply-To: Message-ID-Hash: 56GR6R7FKAM4EFBD7XW5OZWUNV23GZRI X-Message-ID-Hash: 56GR6R7FKAM4EFBD7XW5OZWUNV23GZRI X-MailFrom: dgibson@gandalf.ozlabs.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: passt-dev@passt.top X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --s3Tji4iN3Xley4cg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. >=20 > And if you're wondering who's behind this laziness, check the author's na= me... >=20 > https://gitlab.com/qemu-project/ipxe/-/blob/master/src/drivers/net/virtio= -net.c?ref_type=3Dheads#L8 Aw man, not that guy! --=20 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 --s3Tji4iN3Xley4cg Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEO+dNsU4E3yXUXRK2zQJF27ox2GcFAmnBwbIACgkQzQJF27ox 2GeGSw//YlT6zz+ZOU+NrSNl/KLEoCbwuXjUG691mr72qmzD3ESNITwrFHPzcZvQ 4b/dNGMOwiSkSTlyRLFSjDTk0Do5KCWLwHEzAUMW2uGrQXBp6mG/QEPPbD2xBS5Y NfgCTVgLJ9rcyaUQPzkKLeduSkxdeMpekGoDILIlYUYzzLqAnpKPO3EwUeWfH6TD BhVuKPMT9kdnvfjb6gSaSkbFeQWNtUtAGfAgXuwE4rXTDL1vWDPp1FdWf9Gw8RP4 bcozUMUBXx1YUNqu1DrG4delNuDDNYIceJy6/Owxhx+y+FaCCTT5bm4kWSiW4B8M 9fITZAJ+k87hdjF0YE3SwLapL7N0Xxqlv61ANdDwj86nNu7acFl6rXh4sydx0pHU nkKCeP2NYjXMe76QFLdV/KFv/C0OMkTZW2KgPq+nUn+EYuC8xfBk9NB5bpa1AQA3 fDAhyoyV8zcWgeyii7pkJr/SvaOt4zSND+2XtnE3ysYG0vSjhM4Kr3GKU1npKGpk MfsxNqTxBVQH3q4uvnwH0wQ8g3JujW/gOsaLtJFgBcIoNAoK+qAGPSTvFL/8qoR6 3wpX9PhY/RUS6EMsYMOyT7XXNK1/Gv6vSDsP7nZ8dV3lzyqEOx2hEndRgKchRxXx bGq8GXUX8Z2AqR40oOyc6xWrGKlK/0it8QsAMcIX7s38z4KzyQ4= =93kP -----END PGP SIGNATURE----- --s3Tji4iN3Xley4cg--