From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f171.google.com (mail-pf1-f171.google.com [209.85.210.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8FA528851C for ; Fri, 26 Sep 2025 22:53:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758927225; cv=none; b=PtdWgcodAYPvWtypJvAfzqQGbc/BqEQvlysBHJSCl8RfPluUuwxy+ho6Bfk7cCu5u3PEoxbVeLwjTmi6w7syK37A8fj6SAesIHBOiUayzcefxl9gyH7r1acm3Dw01MREguCC0tuuKrfpvyJiU2qUu9y3qimhxP9P1/3Dh7WfvMY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758927225; c=relaxed/simple; bh=fEomOeWR3k8vHaHxgyePZUTIkATiM1CSbm2n2U1m+B0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JAUWYZ24iyctIdUnh+qlC2yNbH9F73TyhwiF81Y/SFFy9VkYLwO/2wfuxnxhdnGh0o2Rd/vgrqnrfn3LfvJt+2qJEli6CvB5qjjfai50KDNxu/d9I5nQ2kQZoYgVFXfnoDa2HJz+XYeQeiKFS3+8Y/fxPcTCpfZulnJATRG4T1I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=PMmYyxbD; arc=none smtp.client-ip=209.85.210.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PMmYyxbD" Received: by mail-pf1-f171.google.com with SMTP id d2e1a72fcca58-78100be28easo2037079b3a.1 for ; Fri, 26 Sep 2025 15:53:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1758927223; x=1759532023; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=L64jj/1bEf6Wb3tfKGPiM7Hcv1CIUMxOk206Ub6oLd8=; b=PMmYyxbD0YaFKI+2YT7DJGdSeDPhG94zrNIQx4VdrU3m8w4dwCKu7T6UeiitHXbmwT iuIIoUjSgLARZjpAsKyt23goMtb6FJ7D8QefdwvEASMoVzIxWtlkwBJkZIeFf5Y2Z6xi TaPIEqwdLRJ1itbKJ5g7tvzsktHFNXoyl6uitjM9QAKszWe4cRZQrnb3byl6Zlu3RfmH ngzeZxnFhyvmeNCR2NibUFS8CLYUg7tv8uUsnAbFi9pgzOs9mXdu8yk+h6YcGKQNI4w6 WaXMoger9qHLon6cZUKi6buVW9Yf882SfT2RngkVD4Zo92ZI1HLCGVlAH0AzA6s0BcGM lWPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758927223; x=1759532023; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=L64jj/1bEf6Wb3tfKGPiM7Hcv1CIUMxOk206Ub6oLd8=; b=oJD5k3CPt6bxNm+mfcJ0uuFpnkq/UhD+Xl+9Z8LmM2derKN3fn8DKhAQsS3V+n6VaQ nqseKAO8OlsYGcX698o6WcsEMq4IdpiH8yKfzK/bNQypMpynKq9mnrbRBzg6VzVIQ2tW Wq/1qgNrnQ8PCH21LNAlmdi783EltYVvmhygC7k7BtL8n8/aMpZKV4TFQY1YS2BQJvsg UhDAVzP4HF4xXBgc2SvT1tWOtviva8OcOmwSz4XFbV3/7rAZPHmU9qOl7UAgVrmvSmAe aNHpSDSLwKmowkc0jDyR1Jx5W1dwaXN1dQUqVPU8b4vM6x1dI9fRTovB1Gn2sl2WtbOd 3BaA== X-Forwarded-Encrypted: i=1; AJvYcCXseBdVG+tWlvee21mEgwVmEr0uzSHBWB5FEbXR9Yv0WBJc/EUWSOMIm0xRlXMm+vSyPaXy6NY=@vger.kernel.org X-Gm-Message-State: AOJu0Ywn2ju9Z+eRg/lueExYLzKiKdhfx9Iq1qc7uLODOL9RXnCvPsw9 ctXf7zFs4gdCzoZLLSMsEsQ2eAliE1MGeMo7E+Dp+79vXgPW2Ym4Ybk= X-Gm-Gg: ASbGncuZ9jlj1p0C3tpAzZN4DZf1dxbupk3yIMu/hSj/NowbTirgkzM9pPPupd+4/Yi /IVEA87oIinlktLfilKtfetnxJ7S3KN/5X6YwdSxNrLaI9q9bSiPrP4DQ2xvNM4vRT/17xgN8Uf hQdfkGn1HzxGdO4TEfMSimW6nDr25sy68ovST4L8nI3iK5ZnR0678lzW1ZVLRR7KPKaw13OWpZJ nTG5D07KW574UJyJSmgAFKIRzKNTIwhe/naeI1GQoPCLkSzhqdRSe1Qn1TFKkwjdO6Cyc/p9YZ/ IFKEjiQr31SFyOgEraGMyrnjF0lpg56hepomolykOPDnFNdJGnswVgvUmI9Kgb9ApORlE/OMS79 EBpklrrr3S94544GaSc3XNeyv8N/mGAVR2/97FyyvKT4/7i7htmQoVZK+QNblL6q2lEXGtYsyMx a5WEuf7aFlhiMsUB3ZROb/dW+PngxjbCxvk1tgUqP3dovM/nwsEO/wPpO4bEBGSOqYYw3TDgI6H wZWKkV2NIoOI5c= X-Google-Smtp-Source: AGHT+IHzUVqGkwRKGx9oX64k2CwdiQYFO+LB2LrVkfcj7y3QFUFaw1ssnQ7tqKDzQxD8YBaWVCcYfg== X-Received: by 2002:a05:6a00:2345:b0:77f:2e62:1e32 with SMTP id d2e1a72fcca58-780fce1f177mr9884757b3a.2.1758927222725; Fri, 26 Sep 2025 15:53:42 -0700 (PDT) Received: from localhost (c-73-158-218-242.hsd1.ca.comcast.net. [73.158.218.242]) by smtp.gmail.com with UTF8SMTPSA id d2e1a72fcca58-78102b22f5fsm5418527b3a.53.2025.09.26.15.53.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Sep 2025 15:53:42 -0700 (PDT) Date: Fri, 26 Sep 2025 15:53:41 -0700 From: Stanislav Fomichev To: Jesper Dangaard Brouer Cc: Lorenzo Bianconi , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Alexei Starovoitov , Daniel Borkmann , 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 , netdev@vger.kernel.org, bpf@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH RFC bpf-next v2 1/5] netlink: specs: Add XDP RX checksum capability to XDP metadata specs Message-ID: References: <20250925-bpf-xdp-meta-rxcksum-v2-0-6b3fe987ce91@kernel.org> <20250925-bpf-xdp-meta-rxcksum-v2-1-6b3fe987ce91@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On 09/26, Jesper Dangaard Brouer wrote: > > > On 26/09/2025 06.20, Stanislav Fomichev wrote: > > On 09/25, Lorenzo Bianconi wrote: > > > Introduce XDP RX checksum capability to XDP metadata specs. XDP RX > > > checksum will be use by devices capable of exposing receive checksum > > > result via bpf_xdp_metadata_rx_checksum(). > > > Moreover, introduce xmo_rx_checksum netdev callback in order allow the > > > eBPF program bounded to the device to retrieve the RX checksum result > > > computed by the hw NIC. > > > > > > Signed-off-by: Lorenzo Bianconi > > > --- > > > Documentation/netlink/specs/netdev.yaml | 5 +++++ > > > include/net/xdp.h | 14 ++++++++++++++ > > > net/core/xdp.c | 29 +++++++++++++++++++++++++++++ > > > 3 files changed, 48 insertions(+) > > > > > > diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml > > > index e00d3fa1c152d7165e9485d6d383a2cc9cef7cfd..00699bf4a7fdb67c6b9ee3548098b0c933fd39a4 100644 > > > --- a/Documentation/netlink/specs/netdev.yaml > > > +++ b/Documentation/netlink/specs/netdev.yaml > > > @@ -61,6 +61,11 @@ definitions: > > > doc: | > > > Device is capable of exposing receive packet VLAN tag via > > > bpf_xdp_metadata_rx_vlan_tag(). > > > + - > > > + name: checksum > > > + doc: | > > > + Device is capable of exposing receive checksum result via > > > + bpf_xdp_metadata_rx_checksum(). > > > - > > > type: flags > > > name: xsk-flags > > > diff --git a/include/net/xdp.h b/include/net/xdp.h > > > index aa742f413c358575396530879af4570dc3fc18de..9ab9ac10ae2074b70618a9d4f32544d8b9a30b63 100644 > > > --- a/include/net/xdp.h > > > +++ b/include/net/xdp.h > > > @@ -586,6 +586,10 @@ void xdp_attachment_setup(struct xdp_attachment_info *info, > > > NETDEV_XDP_RX_METADATA_VLAN_TAG, \ > > > bpf_xdp_metadata_rx_vlan_tag, \ > > > xmo_rx_vlan_tag) \ > > > + XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CHECKSUM, \ > > > + NETDEV_XDP_RX_METADATA_CHECKSUM, \ > > > + bpf_xdp_metadata_rx_checksum, \ > > > + xmo_rx_checksum) > > > enum xdp_rx_metadata { > > > #define XDP_METADATA_KFUNC(name, _, __, ___) name, > > > @@ -643,12 +647,22 @@ enum xdp_rss_hash_type { > > > XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR, > > > }; > > > +enum xdp_checksum { > > > + XDP_CHECKSUM_NONE = CHECKSUM_NONE, > > > + XDP_CHECKSUM_UNNECESSARY = CHECKSUM_UNNECESSARY, > > > + XDP_CHECKSUM_COMPLETE = CHECKSUM_COMPLETE, > > > + XDP_CHECKSUM_PARTIAL = CHECKSUM_PARTIAL, > > > +}; > > > > Btw, might be worth mentioning, awhile ago we had settled on a smaller set of > > exposed types: > > > > https://lore.kernel.org/netdev/20230811161509.19722-13-larysa.zaremba@intel.com/ > > > > Maybe go through the previous postings and check if the arguments are > > still relevant? (or explain why we want more checksum now) > > IHMO the linked proposal reduced the types too much. IIRC, PARTIAL was removed because it's mostly (or only) a TX feature? So no real need to expose it as an rx hint. And I think empty xdp_csum_status in that proposal might have indicated NONE?