From patchwork Fri Dec 29 08:14:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Menglong Dong X-Patchwork-Id: 759158 Received: from mail-oi1-f193.google.com (mail-oi1-f193.google.com [209.85.167.193]) (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 968E963BD; Fri, 29 Dec 2023 08:15:35 +0000 (UTC) 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="TL0uNxiH" Received: by mail-oi1-f193.google.com with SMTP id 5614622812f47-3bbc649c275so1157539b6e.0; Fri, 29 Dec 2023 00:15:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1703837734; x=1704442534; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=mls/lKeRuEJX81ADB8AP6pjIEWywIDX4oG7UfNICr7k=; b=TL0uNxiHJPqAkOLXCZMMojevWm2KC4EXJkibujsSdaqbumoGfxbG+8gUB1cQGA2VdP 5FBufApeWTtKJ4zJqyoKDktTEdIdp1+ruO9TmmB0Wgocrh1BM4PEfXGtm/k2CnhytTp/ 0hhsYtYVsoJitwuz2D2TMgx3o+SXhdXMhT4qtFrc+wR2D5U+quG7bbJ7aqpIaB8egNJB CSv+E4/BgDQe9S2rSqR7rnRZ7NL7dWncr9aEJEisuwOHpRtgJ7Lrdhn1olOpGHmpXARK DWZtrs76Q5BR7YQRnAgDq/NfUbC5Q/W33eMZx3sAW4WuN2RZMnmSrOCQ8dFHmxZSF3u2 teqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703837734; x=1704442534; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=mls/lKeRuEJX81ADB8AP6pjIEWywIDX4oG7UfNICr7k=; b=Ycjm+oUGZfqmMxDZoIQBJNBJyH/EhLzF/2lXDOIFm1tCEZ+uRntlXnys98dB8DNHj2 HX3laOJn2R2jwUOBvuT3wowPbV9dPLJSDqTa0dbWlV6aw4scgZzTpPCTWtS5ThAfUnwJ DUk7pFiFGJagyF0F6zWBV61sKNj8jQxCQb3hpBi/BBLZhaeKl5Vcke7o3dX+ASfhtngk FnutpUoYhkb3GBUVkQaeVdcEKuRjOb9Qs8BVXcSvhg88Zbw3bZWsb4jgM5e6K3zJcpTA TqC420U1xpnH6wn5c3cN/ubJcE8Z6b2oRthAl1y3xSpV13+g38rP+eh4NgGVo3ZnpyVB ShDA== X-Gm-Message-State: AOJu0Yxu7oOtop6ZTA23g8/hYKVBZlSdRxbJb/tAQCWijqwo77Ow+3Dk XDg7eKhxZWP1D7NbjA0Vw+U= X-Google-Smtp-Source: AGHT+IHqrCvsUFLVr2LGXBlSiozkeXrZfKQwcvZIEeFWIKpzouqr1zjJvb4G1ZTQRWPnA8YiVZjhKQ== X-Received: by 2002:a05:6808:138c:b0:3bb:7cce:1ed0 with SMTP id c12-20020a056808138c00b003bb7cce1ed0mr6911861oiw.81.1703837734600; Fri, 29 Dec 2023 00:15:34 -0800 (PST) Received: from localhost.localdomain ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id h12-20020a63df4c000000b005bd2b3a03eesm14339412pgj.6.2023.12.29.00.15.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Dec 2023 00:15:34 -0800 (PST) From: Menglong Dong To: andrii@kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com, shuah@kernel.org, horms@kernel.org, dhowells@redhat.com, linyunsheng@huawei.com, aleksander.lobakin@intel.com, joannelkoong@gmail.com, laoar.shao@gmail.com, kuifeng@meta.com, menglong8.dong@gmail.com, bjorn@rivosinc.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next 0/2] bpf: add csum/ip_summed fields to __sk_buff Date: Fri, 29 Dec 2023 16:14:07 +0800 Message-Id: <20231229081409.1276386-1-menglong8.dong@gmail.com> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 For now, we have to call some helpers when we need to update the csum, such as bpf_l4_csum_replace, bpf_l3_csum_replace, etc. These helpers are not inlined, which causes poor performance. In fact, we can define our own csum update functions in BPF program instead of bpf_l3_csum_replace, which is totally inlined and efficient. However, we can't do this for bpf_l4_csum_replace for now, as we can't update skb->csum, which can cause skb->csum invalid in the rx path with CHECKSUM_COMPLETE mode. What's more, we can't use the direct data access and have to use skb_store_bytes() with the BPF_F_RECOMPUTE_CSUM flag in some case, such as modifing the vni in the vxlan header and the underlay udp header has no checksum. In the first patch, we make skb->csum readable and writable, and we make skb->ip_summed readable. For now, for tc only. With these 2 fields, we don't need to call bpf helpers for csum update any more. In the second patch, we add some testcases for the read/write testing for skb->csum and skb->ip_summed. If this series is acceptable, we can define the inlined functions for csum update in libbpf in the next step. Menglong Dong (2): bpf: add csum/ip_summed fields to __sk_buff testcases/bpf: add testcases for skb->csum to ctx_skb.c include/linux/skbuff.h | 2 + include/uapi/linux/bpf.h | 2 + net/core/filter.c | 22 ++++++++++ tools/include/uapi/linux/bpf.h | 2 + .../testing/selftests/bpf/verifier/ctx_skb.c | 43 +++++++++++++++++++ 5 files changed, 71 insertions(+)