From nobody Tue Nov 26 13:26:33 2024 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 269BE1E32AC; Fri, 18 Oct 2024 09:14:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.190 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729242868; cv=none; b=IR2CTcItuuW9vzJH4+sejNNeSW2unU0kcNxvF6L7VDlzNtKWn7iEuixbjJP0rOwg3pMpZOqP9yO8k3fSDfm25ArBolIlPRFOtldrq+T4QtVGHIIKlWhpwBHA056qKqiXj1ZTfxouKZmk+3y227550e5OfF+w9pLFv2UDu+YFQnY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729242868; c=relaxed/simple; bh=0pL/gayMZUTWrlQja+1vgkIZ0AHX46bA4d1cb9803Y0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=msS0u9+mH/5wTP1qN5Ype/M828pyG22X+IuVHDD1hWWAt068vRRvQZh7hBmsuZ4XN5JPBYz4vPs/8rI/4b86yJpj6emyU/DP68ZsYdKUkkH0X5t3410b7fDPv1tnolfL1Zg0uh9ADVrX+lkCVJwKMtCYNoFeY6WSLcGVnpA8ICs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.190 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.163]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4XVJrs0ygDz2Ddwr; Fri, 18 Oct 2024 17:13:01 +0800 (CST) Received: from dggpemf500014.china.huawei.com (unknown [7.185.36.43]) by mail.maildlp.com (Postfix) with ESMTPS id CDBA6180041; Fri, 18 Oct 2024 17:14:17 +0800 (CST) Received: from huawei.com (10.175.101.6) by dggpemf500014.china.huawei.com (7.185.36.43) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 18 Oct 2024 17:14:16 +0800 From: Muyang Tian To: CC: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Magnus Karlsson , Maciej Fijalkowski , Jonathan Lemon , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , , , , , , , , , , Subject: [PATCH bpf-next v2 1/3] xdp: Add Rx checksum hint Date: Fri, 18 Oct 2024 17:15:00 +0800 Message-ID: <20241018091502.411513-2-tianmuyang@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20241018091502.411513-1-tianmuyang@huawei.com> References: <20241018091502.411513-1-tianmuyang@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemf500014.china.huawei.com (7.185.36.43) Content-Type: text/plain; charset="utf-8" This is an implementation of functionality that allows drivers to expose checksum information to XDP, as generally based on=20 previous work[1], with xdp_csum_status modified. This information includes: - Checksum info, a union of - complete checksum, if checksum is complete - skb-style checksum start and offset, if checksum is partial - Checksum status, an enum which is the same as skb checksums in skbuff.h, identical to sk_buff.ip_summed LINK:[1] https://lore.kernel.org/bpf/20230927075124.23941-13-larysa.zaremba= @intel.com Signed-off-by: Muyang Tian Signed-off-by: Larysa Zaremba --- Documentation/netlink/specs/netdev.yaml | 4 +++ Documentation/networking/xdp-rx-metadata.rst | 3 ++ include/net/xdp.h | 38 ++++++++++++++++++++ include/uapi/linux/netdev.h | 3 ++ net/core/xdp.c | 23 ++++++++++++ tools/include/uapi/linux/netdev.h | 3 ++ 6 files changed, 74 insertions(+) diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlin= k/specs/netdev.yaml index 08412c279297..e6045b447fc1 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -58,6 +58,10 @@ definitions: name: vlan-tag doc: Device is capable of exposing receive packet VLAN tag via bpf_xd= p_metadata_rx_vlan_tag(). + - + name: csum + doc: + Device is capable of exposing receive packet checksum via bpf_xd= p_metadata_rx_csum(). - type: flags name: xsk-flags diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/n= etworking/xdp-rx-metadata.rst index a6e0ece18be5..6cf273b33ee6 100644 --- a/Documentation/networking/xdp-rx-metadata.rst +++ b/Documentation/networking/xdp-rx-metadata.rst @@ -28,6 +28,9 @@ metadata is supported, this set will grow: .. kernel-doc:: net/core/xdp.c :identifiers: bpf_xdp_metadata_rx_vlan_tag =20 +.. kernel-doc:: net/core/xdp.c + :identifiers: bpf_xdp_metadata_rx_csum + An XDP program can use these kfuncs to read the metadata into stack variables for its own consumption. Or, to pass the metadata on to other consumers, an XDP program can store it into the metadata area carried diff --git a/include/net/xdp.h b/include/net/xdp.h index e6770dd40c91..7886658975c4 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -408,6 +408,10 @@ 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_CSUM, \ + NETDEV_XDP_RX_METADATA_CSUM, \ + bpf_xdp_metadata_rx_csum, \ + xmo_rx_csum) \ =20 enum xdp_rx_metadata { #define XDP_METADATA_KFUNC(name, _, __, ___) name, @@ -465,12 +469,46 @@ enum xdp_rss_hash_type { XDP_RSS_TYPE_L4_IPV6_SCTP_EX =3D XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_D= YNHDR, }; =20 +enum xdp_csum_status { + /* The following enums are the same as skb checksums in skbuff.h, refer to + * DOC: skb checksums for more details. + */ + + XDP_CHECKSUM_NONE =3D 0, + XDP_CHECKSUM_UNNECESSARY =3D 1, + /* Checksum, calculated over the entire packet is provided, as ``csum`` in + * ``xdp_csum_info``. + */ + XDP_CHECKSUM_COMPLETE =3D 2, + /* Refer to ``csum_start`` and ``csum_offset`` in ``xdp_csum_info`` for m= ore information. */ + XDP_CHECKSUM_PARTIAL =3D 3, +}; + +union xdp_csum_info { + /* Checksum, calculated over the whole packet. + * Available, if ``status & XDP_CHECKSUM_COMPLETE``. + */ + __wsum csum; + /* Checksum referred to by ``csum_start + csum_offset`` is considered + * valid, but was never calculated, TX device has to do this, + * starting from csum_start packet byte. + * Any preceding checksums are also considered valid. + * Available, if ``status =3D=3D XDP_CHECKSUM_PARTIAL``. + */ + struct { + u16 csum_start; + u16 csum_offset; + }; +}; + struct xdp_metadata_ops { int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp); int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash, enum xdp_rss_hash_type *rss_type); int (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto, u16 *vlan_tci); + int (*xmo_rx_csum)(const struct xdp_md *ctx, enum xdp_csum_status *csum_s= tatus, + union xdp_csum_info *csum_info); }; =20 #ifdef CONFIG_NET diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h index 7c308f04e7a0..a969b25529a3 100644 --- a/include/uapi/linux/netdev.h +++ b/include/uapi/linux/netdev.h @@ -46,11 +46,14 @@ enum netdev_xdp_act { * hash via bpf_xdp_metadata_rx_hash(). * @NETDEV_XDP_RX_METADATA_VLAN_TAG: Device is capable of exposing receive * packet VLAN tag via bpf_xdp_metadata_rx_vlan_tag(). + * @NETDEV_XDP_RX_METADATA_CSUM: Device is capable of exposing receive pac= ket + * checksum via bpf_xdp_metadata_rx_csum(). */ enum netdev_xdp_rx_metadata { NETDEV_XDP_RX_METADATA_TIMESTAMP =3D 1, NETDEV_XDP_RX_METADATA_HASH =3D 2, NETDEV_XDP_RX_METADATA_VLAN_TAG =3D 4, + NETDEV_XDP_RX_METADATA_CSUM =3D 8, }; =20 /** diff --git a/net/core/xdp.c b/net/core/xdp.c index bcc5551c6424..583e00d3580a 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -766,6 +766,29 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const str= uct xdp_md *ctx, return -EOPNOTSUPP; } =20 +/** + * bpf_xdp_metadata_rx_csum - Read XDP frame checksum status and info. + * @ctx: XDP context pointer. + * @csum_status: Destination pointer for checksum status. + * @csum_info: Destination pointer for complete checksum or partial checks= um offset. + * + * Status (@csum_status) is an enum that informs what checksum processing = was + * performed, same as sk_buff.ip_summed. Additional results of such proces= sing, + * such as complete checksum or partial checksum offsets, are passed as + * info (@csum_info). + * + * Return: + * * Returns 0 on success or ``-errno`` on error. + * * ``-EOPNOTSUPP`` : means device driver doesn't implement kfunc + * * ``-ENODATA`` : means checksum status is unknown for this frame + */ +__bpf_kfunc int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx, + enum xdp_csum_status *csum_status, + union xdp_csum_info *csum_info) +{ + return -EOPNOTSUPP; +} + __bpf_kfunc_end_defs(); =20 BTF_KFUNCS_START(xdp_metadata_kfunc_ids) diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/n= etdev.h index 7c308f04e7a0..a969b25529a3 100644 --- a/tools/include/uapi/linux/netdev.h +++ b/tools/include/uapi/linux/netdev.h @@ -46,11 +46,14 @@ enum netdev_xdp_act { * hash via bpf_xdp_metadata_rx_hash(). * @NETDEV_XDP_RX_METADATA_VLAN_TAG: Device is capable of exposing receive * packet VLAN tag via bpf_xdp_metadata_rx_vlan_tag(). + * @NETDEV_XDP_RX_METADATA_CSUM: Device is capable of exposing receive pac= ket + * checksum via bpf_xdp_metadata_rx_csum(). */ enum netdev_xdp_rx_metadata { NETDEV_XDP_RX_METADATA_TIMESTAMP =3D 1, NETDEV_XDP_RX_METADATA_HASH =3D 2, NETDEV_XDP_RX_METADATA_VLAN_TAG =3D 4, + NETDEV_XDP_RX_METADATA_CSUM =3D 8, }; =20 /** --=20 2.41.0