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 X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DEE09C76190 for ; Thu, 25 Jul 2019 22:52:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0BCB229F9 for ; Thu, 25 Jul 2019 22:52:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vFWXwEJg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727036AbfGYWwk (ORCPT ); Thu, 25 Jul 2019 18:52:40 -0400 Received: from mail-pg1-f201.google.com ([209.85.215.201]:32980 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726846AbfGYWwk (ORCPT ); Thu, 25 Jul 2019 18:52:40 -0400 Received: by mail-pg1-f201.google.com with SMTP id a21so24760676pgv.0 for ; Thu, 25 Jul 2019 15:52:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=yqXwkVRCVEANuJ47HJ+E6Vsq3E4n5B4/T1nK9NocYRQ=; b=vFWXwEJgfcYJW2Z2d2kcb92ptDT613MLhkWQQtVEV9XAcdSJ3qLuFaNrkdDkxNefhj r99ew5Ry+jiNnG0LqYp/+KKu2zOyx9NXSQDgk/hhVnBfhfdgO3cDMlvKsx27Y6vkiAzS jt/kho5moQTYELheBZyBmza7kUOHajk46P1sWGZtij1J2WHZN+ubOzgnoEWVDrZVwXP4 CiSDMhanyKhuTgyv7eBxIxdF57urSItnBrv5JA2BH8VFvoXeiGgtQ5W3ImlaMeCLc+u2 ECuxkL5rzUO+bM+xd08dFWiKMi1kwBsZsh4lbs4E9UAkmM7SnvTzyj2IrEVC6UWLZwWc dyBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=yqXwkVRCVEANuJ47HJ+E6Vsq3E4n5B4/T1nK9NocYRQ=; b=oPp0VD7VxxWg4qO2/zpZeQ6lao9HdWX4+a9QuQkgBExJ0JG4QsbMxbg6IDua3zyRKz yzaAhgngW/iS+dU7wlegDlZL+mRS8CpyL3ES+JW4xFpZPoxAz8hvaCRI2J99LUQqXWQ4 Pvqi6tNGB8MB6J6ZIfEyR76QtMUVmA3ZkUCK++7Nh0Of4R2W+DqdPgHhhQ0w0fsl4mmt sxghLTkRXaEf9+g+DhR7MNH4W2wbonmS64B6HIb0iWBxHbGpdoHr5O4uxSpMbvLqrwA+ b+/kOQFRylKCIOMfzuviqaVKmYTOl3QJWPQfYbsbgJ9cWenB6qjE3jPD2kQo4c3/LET1 f5OA== X-Gm-Message-State: APjAAAWAmjfbL3CDBSzKey0RCQmCG0wrGL7To9hM+NDYlIo/Wt+M1gZO edFumDASv4Z3k2MKTFpNTonC9Vk= X-Google-Smtp-Source: APXvYqyIZReguwb8LDkNnn2uypGrrLWGu6eLxB+9ZkE346+t3Fny64svX5TyqmErlGRPhuEnCNfIEz8= X-Received: by 2002:a63:505a:: with SMTP id q26mr86045668pgl.18.1564095159124; Thu, 25 Jul 2019 15:52:39 -0700 (PDT) Date: Thu, 25 Jul 2019 15:52:26 -0700 In-Reply-To: <20190725225231.195090-1-sdf@google.com> Message-Id: <20190725225231.195090-3-sdf@google.com> Mime-Version: 1.0 References: <20190725225231.195090-1-sdf@google.com> X-Mailer: git-send-email 2.22.0.709.g102302147b-goog Subject: [PATCH bpf-next v3 2/7] bpf/flow_dissector: document flags From: Stanislav Fomichev To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: davem@davemloft.net, ast@kernel.org, daniel@iogearbox.net, Stanislav Fomichev , Petar Penkov , Willem de Bruijn , Song Liu Content-Type: text/plain; charset="UTF-8" Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Describe what each input flag does and who uses it. Acked-by: Petar Penkov Acked-by: Willem de Bruijn Acked-by: Song Liu Cc: Song Liu Cc: Willem de Bruijn Cc: Petar Penkov Signed-off-by: Stanislav Fomichev --- Documentation/bpf/prog_flow_dissector.rst | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/bpf/prog_flow_dissector.rst b/Documentation/bpf/prog_flow_dissector.rst index ed343abe541e..a78bf036cadd 100644 --- a/Documentation/bpf/prog_flow_dissector.rst +++ b/Documentation/bpf/prog_flow_dissector.rst @@ -26,6 +26,7 @@ and output arguments. * ``nhoff`` - initial offset of the networking header * ``thoff`` - initial offset of the transport header, initialized to nhoff * ``n_proto`` - L3 protocol type, parsed out of L2 header + * ``flags`` - optional flags Flow dissector BPF program should fill out the rest of the ``struct bpf_flow_keys`` fields. Input arguments ``nhoff/thoff/n_proto`` should be @@ -101,6 +102,23 @@ can be called for both cases and would have to be written carefully to handle both cases. +Flags +===== + +``flow_keys->flags`` might contain optional input flags that work as follows: + +* ``BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG`` - tells BPF flow dissector to + continue parsing first fragment; the default expected behavior is that + flow dissector returns as soon as it finds out that the packet is fragmented; + used by ``eth_get_headlen`` to estimate length of all headers for GRO. +* ``BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL`` - tells BPF flow dissector to + stop parsing as soon as it reaches IPv6 flow label; used by + ``___skb_get_hash`` and ``__skb_get_hash_symmetric`` to get flow hash. +* ``BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP`` - tells BPF flow dissector to stop + parsing as soon as it reaches encapsulated headers; used by routing + infrastructure. + + Reference Implementation ======================== -- 2.22.0.709.g102302147b-goog