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{ "id": 2202543, "url": "http://patchwork.ozlabs.org/api/covers/2202543/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/cover/20260227203457.558196-1-srutherford@google.com/", "project": { "id": 46, "url": "http://patchwork.ozlabs.org/api/projects/46/?format=api", "name": "Intel Wired Ethernet development", "link_name": "intel-wired-lan", "list_id": "intel-wired-lan.osuosl.org", "list_email": "intel-wired-lan@osuosl.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260227203457.558196-1-srutherford@google.com>", "list_archive_url": null, "date": "2026-02-27T20:34:56", "name": "[RFC,PATCHv2,0/1] idpf: IDPF + SWIOTLB Bug", "submitter": { "id": 82335, "url": "http://patchwork.ozlabs.org/api/people/82335/?format=api", "name": "Steve Rutherford", "email": "srutherford@google.com" }, "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/cover/20260227203457.558196-1-srutherford@google.com/mbox/", "series": [ { "id": 493812, "url": "http://patchwork.ozlabs.org/api/series/493812/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=493812", "date": "2026-02-27T20:34:56", "name": "idpf: IDPF + SWIOTLB Bug", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/493812/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2202543/comments/", "headers": { "Return-Path": "<intel-wired-lan-bounces@osuosl.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=zVPYJa10;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::138; 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Miller\" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>,\n Eric Dumazet <edumazet@google.com>, intel-wired-lan@lists.osuosl.org", "Cc": "netdev@vger.kernel.org, linux-kernel@vger.kernel.org,\n David Decotigny <decot@google.com>,\n Anjali Singhai <anjali.singhai@intel.com>,\n Sridhar Samudrala <sridhar.samudrala@intel.com>,\n Brian Vazquez <brianvv@google.com>,\n Li Li <boolli@google.com>, emil.s.tantilov@intel.com,\n Steve Rutherford <srutherford@google.com>", "Content-Type": "text/plain; charset=\"UTF-8\"", "X-Mailman-Original-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=google.com; s=20230601; t=1772224531; x=1772829331; darn=lists.osuosl.org;\n h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject\n :date:message-id:reply-to;\n bh=nRaIjBVYslTopVZnWl1PKdjxejATawghymOdcPvjdcM=;\n b=hakCQ44qxMT8E6HwiFTMMEXFH8X1wwcuBAprk7woArXdfK0KlWTF72+fbCS5GlnuNN\n L5dskEZHbLJsAibceqwSch5/VkFoQG/qRaZqQJQozdpjrZ1P7IjmFofCpvXskJ+ygXiz\n DfCwcEDrobxOsf9DcWIBhRQDso5cXgFFyE/zTVNJarp1YbeTKRYRxFFIR/cdqR6iakaf\n dOpl5+RBpMDZL+cln+Xe3EnoMZonCst7V9x1c2d7czKQ6+uOw/gxsRuKR6gej8n/9Po/\n Binc9c3jSL2NjH5yHSEboz61JbzEytvkqKXkOrIyufebbojUzFHQlcspRiuRhNkVPSVK\n Utgg==", "X-Mailman-Original-Authentication-Results": [ "smtp3.osuosl.org;\n dmarc=pass (p=reject dis=none)\n header.from=google.com", "smtp3.osuosl.org;\n dkim=pass (2048-bit key,\n unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20230601 header.b=hakCQ44q" ], "Subject": "[Intel-wired-lan] [RFC PATCHv2 0/1] idpf: IDPF + SWIOTLB Bug", "X-BeenThere": "intel-wired-lan@osuosl.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n <intel-wired-lan.osuosl.org>", "List-Unsubscribe": "<https://lists.osuosl.org/mailman/options/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=unsubscribe>", "List-Archive": "<http://lists.osuosl.org/pipermail/intel-wired-lan/>", "List-Post": "<mailto:intel-wired-lan@osuosl.org>", "List-Help": "<mailto:intel-wired-lan-request@osuosl.org?subject=help>", "List-Subscribe": "<https://lists.osuosl.org/mailman/listinfo/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=subscribe>", "From": "Steve Rutherford via Intel-wired-lan <intel-wired-lan@osuosl.org>", "Reply-To": "Steve Rutherford <srutherford@google.com>", "Errors-To": "intel-wired-lan-bounces@osuosl.org", "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>" }, "content": "Found an issue with the IDPF driver when SWIOTLB is enabled. The issue\nresults in empty headers for packets that hit the split queue workaround\npath. It's caused by a spurious sync in that path. The header is synced\nfrom the SWIOTLB even when the header was shoved into the payload.\n\nI cooked up a sample patch, but I'm not an expert in this driver, so I have\nno idea if it's the right solution. It did allow my QEMU VM to boot with a\nsuperficially functional passed-through IDPF NIC and SWIOTLB=force.\n\nThe patch was written against COS's 6.12, so I assume that it will not\napply cleanly elsewhere, but I figured a wrong sample patch was better than\na long paragraph describing the same thing. My read of more recent kernels\nis that this problem is still present, but could be mistaken.\n\nv2 - Updated title and tags based on feedback.\n\nSteve Rutherford (1):\n idpf: Fix header clobber in IDPF with SWIOTLB enabled\n\n drivers/net/ethernet/intel/idpf/idpf_txrx.c | 9 +++++++--\n 1 file changed, 7 insertions(+), 2 deletions(-)" }