From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 99FA5E9A02C for ; Thu, 19 Feb 2026 01:47:49 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 50BEA60B65; Thu, 19 Feb 2026 01:47:49 +0000 (UTC) X-Virus-Scanned: amavis at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavis, port 10024) with ESMTP id myWqXQjcafCf; Thu, 19 Feb 2026 01:47:47 +0000 (UTC) X-Comment: SPF check N/A for local connections - client-ip=140.211.166.142; helo=lists1.osuosl.org; envelope-from=intel-wired-lan-bounces@osuosl.org; receiver= DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 4460160B64 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org; s=default; t=1771465667; bh=/A9kCnxsZ/wdbZGeHzSUOd56ynX6731f0HRIToRSOjQ=; h=Date:From:To:Cc:In-Reply-To:References:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=jQhIEtAMkChFI9lZJB2VQOtUxN66T5vO9NVZtiww++1DC1dQitzBg5zFasjBjvgBt 0j2Kgb8gorONrbVitRrO6LgpPcqV803jtb5/GozunpGWd1lS+d2o5Q40ZC+PAIFD8g bhd5bRQB7MWuUZtZlj6NrS3/rZTE7dm9UgC2BsCjhXsI/2mClR0Go+guZFaXepuAlZ pONDEi3N/Klo6biwbrQATuqFWBiAelhawTK9DcBqMcJJ5zOrZ77FsPFMMx5+L3KGmO iN2vV1Aqh8SOCX1t4kVQ/WqSbGA1K88e8jQs2mYflRwQX4jLQbyLf7jkm8METiNIT9 Qg22qzwSp1zvw== Received: from lists1.osuosl.org (lists1.osuosl.org [140.211.166.142]) by smtp3.osuosl.org (Postfix) with ESMTP id 4460160B64; Thu, 19 Feb 2026 01:47:47 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists1.osuosl.org (Postfix) with ESMTP id 1FEBD183 for ; Thu, 19 Feb 2026 01:47:46 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 019CE60B64 for ; Thu, 19 Feb 2026 01:47:46 +0000 (UTC) X-Virus-Scanned: amavis at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavis, port 10024) with ESMTP id EfMXJUqP3YDb for ; Thu, 19 Feb 2026 01:47:45 +0000 (UTC) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=kuba@kernel.org; receiver= DMARC-Filter: OpenDMARC Filter v1.4.2 smtp3.osuosl.org 547F260B5F DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 547F260B5F Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by smtp3.osuosl.org (Postfix) with ESMTPS id 547F260B5F for ; Thu, 19 Feb 2026 01:47:45 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 6628644314; Thu, 19 Feb 2026 01:47:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 219B4C116D0; Thu, 19 Feb 2026 01:47:43 +0000 (UTC) Date: Wed, 18 Feb 2026 17:47:42 -0800 From: Jakub Kicinski To: Lorenzo Bianconi Cc: Donald Hunter , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Andrew Lunn , Tony Nguyen , Przemek Kitszel , Alexander Lobakin , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Shuah Khan , Maciej Fijalkowski , Jakub Sitnicki , netdev@vger.kernel.org, bpf@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-kselftest@vger.kernel.org Message-ID: <20260218174742.62a4074f@kernel.org> In-Reply-To: <20260217-bpf-xdp-meta-rxcksum-v3-1-30024c50ba71@kernel.org> References: <20260217-bpf-xdp-meta-rxcksum-v3-0-30024c50ba71@kernel.org> <20260217-bpf-xdp-meta-rxcksum-v3-1-30024c50ba71@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771465664; bh=/A9kCnxsZ/wdbZGeHzSUOd56ynX6731f0HRIToRSOjQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Sw4vWfpJjIO+b/19FsTFw7nUmnEZZ+P9/Rnov5xjkY4iNiEW8gOtqBJTUpfcxW0Ef Y7v5xO1VpK75Ntgb+GDs8IXp7HfsC3YfkJ6DOqkXA19uRISf00YIKHPErRrQD2q5zW epdWrTUXkQWTzn82IK2c0skkNMWul8T1w0NjQ2oG8bgWOEIslJhAHZ9n5DP46RdufZ aCjE+nPLLxa57F1kG3esUpmWK00qrtoO5XigA752N+DbyGrHUffg5mKSiBpE/FNrQ2 sAffqp+HShkEia0hM4L97nys0TAvnrEpoRW8xw6G/9cEPUwV+bYVsTblTlg28LhF0H 1PDqCeBA036WA== X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=Sw4vWfpJ Subject: Re: [Intel-wired-lan] [PATCH bpf-next v3 1/5] netlink: specs: Add XDP RX checksum capability to XDP metadata specs X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Tue, 17 Feb 2026 09:33:56 +0100 Lorenzo Bianconi wrote: > + * In case of success, ``ip_summed`` is set to the RX checksum result. Possible > + * values are: > + * ``XDP_CHECKSUM_NONE`` > + * ``XDP_CHECKSUM_UNNECESSARY`` > + * ``XDP_CHECKSUM_COMPLETE`` > + * > + * In case of success, ``cksum_meta`` contains the hw computed checksum value > + * for ``XDP_CHECKSUM_COMPLETE`` or the ``csum_level`` for > + * ``XDP_CHECKSUM_UNNECESSARY``. It is set to 0 for ``XDP_CHECKSUM_NONE`` It's fairly common for NICs to report both csum complete and unnecessary. Which one should the driver return in that case? What if the user prefers the other one?..