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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 5AF7CC433E9 for ; Sun, 14 Mar 2021 11:12:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2AEFC64EC3 for ; Sun, 14 Mar 2021 11:12:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235239AbhCNLL3 (ORCPT ); Sun, 14 Mar 2021 07:11:29 -0400 Received: from mail-40136.protonmail.ch ([185.70.40.136]:23049 "EHLO mail-40136.protonmail.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234362AbhCNLK7 (ORCPT ); Sun, 14 Mar 2021 07:10:59 -0400 Date: Sun, 14 Mar 2021 11:10:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pm.me; s=protonmail; t=1615720257; bh=8pljKco6S41xC6hA1KN72x2WWC8GcMpq0scMzGiuX40=; h=Date:To:From:Cc:Reply-To:Subject:From; b=HYkJKo65cP0jCYvfrRvkUzRvVskjy8BBls/otbbBiOFEUnKYmV5O9CtcJEbdpJ6y6 +3Df0LiBqx4VKoLPkgTeMSiTU6tefwCx4d93Cm19JpGofDjhiT3NDqmDxUwRN0srzu qbDaDtIrGP2KPuO2Xd1SwrJ9dJieNcbacpInw/NgQ4pS+1CEenAH9iVwwXE2Cnjx5k XOwgylygpo8aZHyScxotXbodEpnXzx7D9T5HczNU/wlOHLOtRKUXCIlbctKzZrflpg VZhA8ByrreRkzG584KiYUvDIpVKXDut3xEW3XNmMF1xjLTwMJcqh5TUMiCeV5eEK9v zxw9WkQ7KHWFA== To: "David S. Miller" , Jakub Kicinski From: Alexander Lobakin Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Jonathan Lemon , Alexander Lobakin , Eric Dumazet , Willem de Bruijn , Kevin Hao , Pablo Neira Ayuso , Jakub Sitnicki , Marco Elver , Dexuan Cui , Vladimir Oltean , Ariel Levkovich , Wang Qing , Davide Caratti , Guillaume Nault , Eran Ben Elisha , Mauro Carvalho Chehab , Kirill Tkhai , Bartosz Golaszewski , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Reply-To: Alexander Lobakin Subject: [PATCH v3 net-next 0/6] skbuff: micro-optimize flow dissection Message-ID: <20210314111027.7657-1-alobakin@pm.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This little number makes all of the flow dissection functions take raw input data pointer as const (1-5) and shuffles the branches in __skb_header_pointer() according to their hit probability. The result is +20 Mbps per flow/core with one Flow Dissector pass per packet. This affects RPS (with software hashing), drivers that use eth_get_headlen() on their Rx path and so on. >From v2 [1]: - reword some commit messages as a potential fix for NIPA; - no functional changes. >From v1 [0]: - rebase on top of the latest net-next. This was super-weird, but I double-checked that the series applies with no conflicts, and then on Patchwork it didn't; - no other changes. [0] https://lore.kernel.org/netdev/20210312194538.337504-1-alobakin@pm.me [1] https://lore.kernel.org/netdev/20210313113645.5949-1-alobakin@pm.me Alexander Lobakin (6): flow_dissector: constify bpf_flow_dissector's data pointers skbuff: make __skb_header_pointer()'s data argument const flow_dissector: constify raw input data argument linux/etherdevice.h: misc trailing whitespace cleanup ethernet: constify eth_get_headlen()'s data argument skbuff: micro-optimize {,__}skb_header_pointer() include/linux/etherdevice.h | 4 ++-- include/linux/skbuff.h | 26 +++++++++++------------ include/net/flow_dissector.h | 6 +++--- net/core/flow_dissector.c | 41 +++++++++++++++++++----------------- net/ethernet/eth.c | 2 +- 5 files changed, 40 insertions(+), 39 deletions(-) -- 2.30.2