From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: passt.top; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: passt.top; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=OJFUJWjW; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by passt.top (Postfix) with ESMTPS id 91A4C5A0626 for ; Mon, 23 Mar 2026 19:15:42 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774289741; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=Wqkm8Ht4ms1b05niMbACzrhZk1e/DYirsZXN1s6wN58=; b=OJFUJWjWm8mFydcC2G2cfFhMxsvRw7aMXmF2baGgl5kydkCMl7tp5GNUMq148Ccu8Vr/9n sMWBnZ+eUb2nX7v1EZ5E9xksqJRVbOdasYHLqqxEm13OBM4WrqtG1uv1ne9ngK2zBshSxl +DdaLvKTazfVNnnp84sVE7m/JmjAkCU= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-79-OeVET9TSPK-dhn3AwZD0Yg-1; Mon, 23 Mar 2026 14:15:39 -0400 X-MC-Unique: OeVET9TSPK-dhn3AwZD0Yg-1 X-Mimecast-MFC-AGG-ID: OeVET9TSPK-dhn3AwZD0Yg_1774289738 Received: by mail-wr1-f70.google.com with SMTP id ffacd0b85a97d-43b7ec737c1so640721f8f.1 for ; Mon, 23 Mar 2026 11:15:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774289738; x=1774894538; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:to:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=Wqkm8Ht4ms1b05niMbACzrhZk1e/DYirsZXN1s6wN58=; b=NKdHXqITUAhzLn3Y8bpB1D8fTbAuoDA3v9+zl6u35cLku9BLBsjF6xui0L04BMrWMi 37uIfDpjFwyCjorsoYKoU7yzpf5nEV0dObob8ep+gzm4VowIB4RMegq3MMdO0B71YlZq f1fntHsKliRjuy9oKthMRI1Zm+QSjLZ7xX5PAD/g2wA/g/V4BElQZBSkvw5AD4ml/Tpb A6Za9EdjeZUuZ52BZJQbF1WGLHIHvI4/uhQoE/azUyx5gDB04OWDBJg5i/o8pY8X063o nExcF7dkJvzCbHXNuy4BchIKsqPP4ocNwkE7Gq1xvVD/A48uEY9lZOIXY+NtRrEEqkx/ hPRQ== X-Gm-Message-State: AOJu0Yw6pouFmq6eprlsfltFAtYw2bQ/RVfMFZ8rrRShbwlyr9578hiw HCM/ZQOWATGO27rd31b09gTgqNqkMuCCew0pqEnkp37B69+eB6/I9lsiSMQxdanPcexqVfR+V1Z vw0x+HO3pTNkBno8Tg8bjY55Crtl0BNtV38mAqbG9eEu1yRRKOoxXVSYbIV+DP+2wfEPmEofZtx 9HvrgCccID14XNvjaY/Fo++ggzdgdsuUtT32nI X-Gm-Gg: ATEYQzwJSlIq7bIriJCGmGoE89ASipXkYnaEP+tTeUdhuUx8sNWtZtJ7KWXjHG6qaL3 tKfA4rchmfzc2SfjgYpDTbPS5ngoBOhoOWPtyXy06wFYtp1LqKXLRgOlkqL5nV0lVR0M0rGjIuC EkGbE/GUqdaIFHOGIrsmnTmr6B1ocoJLSnxgrT1agZlcVBOihg8whGCacT2kmDdOCPTWsf/HdzK PUSqkbCXOUqkh+42peQfmVhYCcevMLlND27HYSpji7PwuVjDckLB7Eumua1nvUrWu2xEjMZ41mv mwrNsWCShO4C1eJlJoo5Q4lnKwALaRUuYRC+GRuoNUjIgJ56AJ/okC1dnUDu8iSR819r4aOqxT9 sBoTgeEmA2mBNlXWJTzH2ji4gZKy582FJl+3vU0UyShnV1NoJySzJ6oK8zdNC+rZ1Qg== X-Received: by 2002:a05:6000:24c5:b0:439:cb10:dfcd with SMTP id ffacd0b85a97d-43b64286f98mr21842533f8f.39.1774289738039; Mon, 23 Mar 2026 11:15:38 -0700 (PDT) X-Received: by 2002:a05:6000:24c5:b0:439:cb10:dfcd with SMTP id ffacd0b85a97d-43b64286f98mr21842481f8f.39.1774289737558; Mon, 23 Mar 2026 11:15:37 -0700 (PDT) Received: from ?IPV6:2a01:e0a:e10:ef90:4326:a36e:a7cb:624b? ([2a01:e0a:e10:ef90:4326:a36e:a7cb:624b]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b644ae016sm30257490f8f.4.2026.03.23.11.15.36 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2026 11:15:36 -0700 (PDT) Message-ID: Date: Mon, 23 Mar 2026 19:15:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] vhost_user: Offer VIRTIO_NET_F_GUEST_CSUM To: passt-dev@passt.top References: <20260323180149.1268399-1-lvivier@redhat.com> From: Laurent Vivier Autocrypt: addr=lvivier@redhat.com; keydata= xsFNBFYFJhkBEAC2me7w2+RizYOKZM+vZCx69GTewOwqzHrrHSG07MUAxJ6AY29/+HYf6EY2 WoeuLWDmXE7A3oJoIsRecD6BXHTb0OYS20lS608anr3B0xn5g0BX7es9Mw+hV/pL+63EOCVm SUVTEQwbGQN62guOKnJJJfphbbv82glIC/Ei4Ky8BwZkUuXd7d5NFJKC9/GDrbWdj75cDNQx UZ9XXbXEKY9MHX83Uy7JFoiFDMOVHn55HnncflUncO0zDzY7CxFeQFwYRbsCXOUL9yBtqLer Ky8/yjBskIlNrp0uQSt9LMoMsdSjYLYhvk1StsNPg74+s4u0Q6z45+l8RAsgLw5OLtTa+ePM JyS7OIGNYxAX6eZk1+91a6tnqfyPcMbduxyBaYXn94HUG162BeuyBkbNoIDkB7pCByed1A7q q9/FbuTDwgVGVLYthYSfTtN0Y60OgNkWCMtFwKxRaXt1WFA5ceqinN/XkgA+vf2Ch72zBkJL RBIhfOPFv5f2Hkkj0MvsUXpOWaOjatiu0fpPo6Hw14UEpywke1zN4NKubApQOlNKZZC4hu6/ 8pv2t4HRi7s0K88jQYBRPObjrN5+owtI51xMaYzvPitHQ2053LmgsOdN9EKOqZeHAYG2SmRW LOxYWKX14YkZI5j/TXfKlTpwSMvXho+efN4kgFvFmP6WT+tPnwARAQABzSNMYXVyZW50IFZp dmllciA8bHZpdmllckByZWRoYXQuY29tPsLBeAQTAQIAIgUCVgVQgAIbAwYLCQgHAwIGFQgC CQoLBBYCAwECHgECF4AACgkQ8ww4vT8vvjwpgg//fSGy0Rs/t8cPFuzoY1cex4limJQfReLr SJXCANg9NOWy/bFK5wunj+h/RCFxIFhZcyXveurkBwYikDPUrBoBRoOJY/BHK0iZo7/WQkur 6H5losVZtrotmKOGnP/lJYZ3H6OWvXzdz8LL5hb3TvGOP68K8Bn8UsIaZJoeiKhaNR0sOJyI YYbgFQPWMHfVwHD/U+/gqRhD7apVysxv5by/pKDln1I5v0cRRH6hd8M8oXgKhF2+rAOL7gvh jEHSSWKUlMjC7YwwjSZmUkL+TQyE18e2XBk85X8Da3FznrLiHZFHQ/NzETYxRjnOzD7/kOVy gKD/o7asyWQVU65mh/ECrtjfhtCBSYmIIVkopoLaVJ/kEbVJQegT2P6NgERC/31kmTF69vn8 uQyW11Hk8tyubicByL3/XVBrq4jZdJW3cePNJbTNaT0d/bjMg5zCWHbMErUib2Nellnbg6bc 2HLDe0NLVPuRZhHUHM9hO/JNnHfvgiRQDh6loNOUnm9Iw2YiVgZNnT4soUehMZ7au8PwSl4I KYE4ulJ8RRiydN7fES3IZWmOPlyskp1QMQBD/w16o+lEtY6HSFEzsK3o0vuBRBVp2WKnssVH qeeV01ZHw0bvWKjxVNOksP98eJfWLfV9l9e7s6TaAeySKRRubtJ+21PRuYAxKsaueBfUE7ZT 7zfOwU0EVgUmGQEQALxSQRbl/QOnmssVDxWhHM5TGxl7oLNJms2zmBpcmlrIsn8nNz0rRyxT 460k2niaTwowSRK8KWVDeAW6ZAaWiYjLlTunoKwvF8vP3JyWpBz0diTxL5o+xpvy/Q6YU3BN efdq8Vy3rFsxgW7mMSrI/CxJ667y8ot5DVugeS2NyHfmZlPGE0Nsy7hlebS4liisXOrN3jFz asKyUws3VXek4V65lHwB23BVzsnFMn/bw/rPliqXGcwl8CoJu8dSyrCcd1Ibs0/Inq9S9+t0 VmWiQWfQkz4rvEeTQkp/VfgZ6z98JRW7S6l6eophoWs0/ZyRfOm+QVSqRfFZdxdP2PlGeIFM C3fXJgygXJkFPyWkVElr76JTbtSHsGWbt6xUlYHKXWo+xf9WgtLeby3cfSkEchACrxDrQpj+ Jt/JFP+q997dybkyZ5IoHWuPkn7uZGBrKIHmBunTco1+cKSuRiSCYpBIXZMHCzPgVDjk4viP brV9NwRkmaOxVvye0vctJeWvJ6KA7NoAURplIGCqkCRwg0MmLrfoZnK/gRqVJ/f6adhU1oo6 z4p2/z3PemA0C0ANatgHgBb90cd16AUxpdEQmOCmdNnNJF/3Zt3inzF+NFzHoM5Vwq6rc1JP jfC3oqRLJzqAEHBDjQFlqNR3IFCIAo4SYQRBdAHBCzkM4rWyRhuVABEBAAHCwV8EGAECAAkF AlYFJhkCGwwACgkQ8ww4vT8vvjwg9w//VQrcnVg3TsjEybxDEUBm8dBmnKqcnTBFmxN5FFtI WlEuY8+YMiWRykd8Ln9RJ/98/ghABHz9TN8TRo2b6WimV64FmlVn17Ri6FgFU3xNt9TTEChq AcNg88eYryKsYpFwegGpwUlaUaaGh1m9OrTzcQy+klVfZWaVJ9Nw0keoGRGb8j4XjVpL8+2x OhXKrM1fzzb8JtAuSbuzZSQPDwQEI5CKKxp7zf76J21YeRrEW4WDznPyVcDTa+tz++q2S/Bp P4W98bXCBIuQgs2m+OflERv5c3Ojldp04/S4NEjXEYRWdiCxN7ca5iPml5gLtuvhJMSy36gl U6IW9kn30IWuSoBpTkgV7rLUEhh9Ms82VWW/h2TxL8enfx40PrfbDtWwqRID3WY8jLrjKfTd R3LW8BnUDNkG+c4FzvvGUs8AvuqxxyHbXAfDx9o/jXfPHVRmJVhSmd+hC3mcQ+4iX5bBPBPM oDqSoLt5w9GoQQ6gDVP2ZjTWqwSRMLzNr37rJjZ1pt0DCMMTbiYIUcrhX8eveCJtY7NGWNyx FCRkhxRuGcpwPmRVDwOl39MB3iTsRighiMnijkbLXiKoJ5CDVvX5yicNqYJPKh5MFXN1bvsB kmYiStMRbrD0HoY1kx5/VozBtc70OU0EB8Wrv9hZD+Ofp0T3KOr1RUHvCZoLURfFhSQ= In-Reply-To: <20260323180149.1268399-1-lvivier@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: s7oHmhny5c_mK7ha1hp06A-hJxs9WOxBHBlIc-qYN8Q_1774289738 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Message-ID-Hash: LMJ4YPYWAMIGSNZSOUQHS62ROSIO2433 X-Message-ID-Hash: LMJ4YPYWAMIGSNZSOUQHS62ROSIO2433 X-MailFrom: lvivier@redhat.com 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 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: 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