From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 7FF8738DE1 for ; Thu, 19 Oct 2023 17:50:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="sozcOd+g" Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16E3812A for ; Thu, 19 Oct 2023 10:50:00 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-d9ab79816a9so10956498276.3 for ; Thu, 19 Oct 2023 10:50:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1697737799; x=1698342599; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=wrMWyFZARXAbpMZ2Cvd01jTOzKURZkdFORFzsP3Nbog=; b=sozcOd+gm7+oWQr4Pdeaz4CG1/tv3av3wtbcpxuM5G7nEl21faL49eNShlaLa+XaQ3 kPUkqLa+w0CdobN/ofrRTuhqk0p9Vk5qrimkGrof+i5dUAGSRmPaErC8hq6/LeKMzPRe 7ov7dJbtmiD58M5d/MPhlyYpra5EunyHJKr4GCI6xKAmMk5dDqM8igMLucFPEkk5tutS qYPtJ1OzKdIQ3z00qWuHJx2/4VVXUfrn1QMmHmVO6TN+qI2M4ZR7CB8TpWKAUZBcadCV nH9BQQzTaUp7wqbBe3UGwo5jscS4BYOB11ElcslKXGHCA3psqjTyYlMNJAvQHhaDJONw VRTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697737799; x=1698342599; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=wrMWyFZARXAbpMZ2Cvd01jTOzKURZkdFORFzsP3Nbog=; b=a7t4F6+/WyYFcZe8GAAJupCr6lRQelO+QH7am3os6UOLV0IPQhX7Jc7z6IbUqnq5K+ JKg+ZJRbuK9HqfCGqb8WPrgJRXIqGHmhGPAJGicrMojaXKGlRCMWbLO06X8WPoirsOUt hqNObT3PiZ2ZklGGtOR85+vCUZPYqbf/xnEZYFkFZiUuWzSwtg8ODLQmTladE/jTY1bP s0yX988S1BMUX3GQwZ9fhV1bhOthl9mfcqEX0JIN0CM5eaPilGvc4YRuF2kkeR35oAno KjzBHnY/bgMdHc/60klnXmgZlzK4wqlMavxKftzM+wUsr8vZqs3Kur/WZ9lYvybeMSAt 9/Kw== X-Gm-Message-State: AOJu0YzGvTOamciW1ZYclCxsMzj71yURroi7rePRcZyOfl+/mTrx1eh6 +UYk/bPZtjNh2ztkfSZQ+YqGYqfk68IFw4SPNPJbYfBWNNcaWR+5pfse7MlHFKmlV/uFbl+48aR tKeqsZ1CUiuiDkaZvY0IynYXEYc48LofyqZeAhhmmlLgfKi3Wtw== X-Google-Smtp-Source: AGHT+IHxAHuZty9GGyTtLqkmEaq6ArCG74wlQJWAeDJOpo/lmMbANhh3Wg7LQS1zGZMT2E0QcNDyIUs= X-Received: from sdf.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5935]) (user=sdf job=sendgmr) by 2002:a25:2683:0:b0:d9a:519f:d0e6 with SMTP id m125-20020a252683000000b00d9a519fd0e6mr64878ybm.6.1697737798751; Thu, 19 Oct 2023 10:49:58 -0700 (PDT) Date: Thu, 19 Oct 2023 10:49:40 -0700 In-Reply-To: <20231019174944.3376335-1-sdf@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231019174944.3376335-1-sdf@google.com> X-Mailer: git-send-email 2.42.0.655.g421f12c284-goog Message-ID: <20231019174944.3376335-8-sdf@google.com> Subject: [PATCH bpf-next v4 07/11] selftests/bpf: Add csum helpers From: Stanislav Fomichev To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, kuba@kernel.org, toke@kernel.org, willemb@google.com, dsahern@kernel.org, magnus.karlsson@intel.com, bjorn@kernel.org, maciej.fijalkowski@intel.com, hawk@kernel.org, yoong.siang.song@intel.com, netdev@vger.kernel.org, xdp-hints@xdp-project.net Content-Type: text/plain; charset="UTF-8" Checksum helpers will be used to calculate pseudo-header checksum in AF_XDP metadata selftests. The helpers are mirroring existing kernel ones: - csum_tcpudp_magic : IPv4 pseudo header csum - csum_ipv6_magic : IPv6 pseudo header csum - csum_fold : fold csum and do one's complement Signed-off-by: Stanislav Fomichev --- tools/testing/selftests/bpf/network_helpers.h | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h index 34f1200a781b..94b9be24e39b 100644 --- a/tools/testing/selftests/bpf/network_helpers.h +++ b/tools/testing/selftests/bpf/network_helpers.h @@ -71,4 +71,47 @@ struct nstoken; */ struct nstoken *open_netns(const char *name); void close_netns(struct nstoken *token); + +static __u16 csum_fold(__u32 csum) +{ + csum = (csum & 0xffff) + (csum >> 16); + csum = (csum & 0xffff) + (csum >> 16); + + return (__u16)~csum; +} + +static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, + __u32 len, __u8 proto, + __wsum csum) +{ + __u64 s = csum; + + s += (__u32)saddr; + s += (__u32)daddr; + s += htons(proto + len); + s = (s & 0xffffffff) + (s >> 32); + s = (s & 0xffffffff) + (s >> 32); + + return csum_fold((__u32)s); +} + +static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, + const struct in6_addr *daddr, + __u32 len, __u8 proto, + __wsum csum) +{ + __u64 s = csum; + int i; + + for (i = 0; i < 4; i++) + s += (__u32)saddr->s6_addr32[i]; + for (i = 0; i < 4; i++) + s += (__u32)daddr->s6_addr32[i]; + s += htons(proto + len); + s = (s & 0xffffffff) + (s >> 32); + s = (s & 0xffffffff) + (s >> 32); + + return csum_fold((__u32)s); +} + #endif -- 2.42.0.655.g421f12c284-goog