From patchwork Sun Mar 1 22:09:44 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Herbert X-Patchwork-Id: 444876 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 53A9D14015A for ; Mon, 2 Mar 2015 09:10:16 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="verification failed; unprotected key" header.d=google.com header.i=@google.com header.b=K69mjHCH; dkim-adsp=none (unprotected policy); dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752235AbbCAWKM (ORCPT ); Sun, 1 Mar 2015 17:10:12 -0500 Received: from mail-ig0-f178.google.com ([209.85.213.178]:40116 "EHLO mail-ig0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751366AbbCAWKK (ORCPT ); Sun, 1 Mar 2015 17:10:10 -0500 Received: by igal13 with SMTP id l13so12785955iga.5 for ; Sun, 01 Mar 2015 14:10:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:subject:date:message-id:in-reply-to:references; bh=bQmywHGvUMY9shzyzjw4LBJ2xknYpM8PKGcIf5y/7vA=; b=K69mjHCHpCz2Z+3xA+mzivbnaA89JLB1MDiRtmQwARIThhdt8kA+KbXxx8dIWyTwfx 7KQoP9Hxipptl+XjNgF1jW74V+GI/Yjn01R7Uzo3wTCuRl6h6BqhrudkBC4d5qt74AxV mK0/6cMD1WW6xj2ASIbc0fHcgoKdo5UYvcUp+yL3QQgKs/iBCPCGYAjSar/tUyAlSQ9H O+yth+QiGyhz3TMQaKFdQRZzFBQsyV6Ygr/U2DsBKN5z+4YXBNqN5ZNm7CpPGDydm1J7 t3jDR1UnNlEr0pCwF43B5uzLi7ASvIF3bhrAA6T9078RjIFiYizFUvq6wQmULCkptPN8 Jstg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references; bh=bQmywHGvUMY9shzyzjw4LBJ2xknYpM8PKGcIf5y/7vA=; b=BsJZ0G5pFWWNsJeSgDXU8FvVCxxuVtsmnjtIH42ADySZOIOCYJSNePmhBd/J3SmPWD ekXdAZPH6vTJm4Zg4YSmZKp9i1cd3YW1S/DPUPDvjzhEjd6e9T+Zda7sjiqdNilg4rBp oRj9zUO+CtLQI0M/k/GcjkG7cx3Q8UeUREeBCfUNJrrr8C+ezGU9Eh/kXKcgctv8Ept7 y5uDpCNRyPCAtF4d9xl1oyqZMJuXFzghahApTyQwwhHEzALInu72aEB3FJ7WicJczrOl dArx7Snyc3AlV2SRJi4myDSTesAnoxBBBnA05iARikC1Ny31zA2kZyNUdq5IMNzbodHe xHnw== X-Gm-Message-State: ALoCoQmsp+vb9KmleTizCFWUCHqFJUBDLHhjhZ/Q8HO2BLGQDq5BD4sQsbEajVU25PuMyGguzizB X-Received: by 10.42.113.2 with SMTP id a2mr27502984icq.30.1425247809698; Sun, 01 Mar 2015 14:10:09 -0800 (PST) Received: from tomh.mtv.corp.google.com ([172.18.117.126]) by mx.google.com with ESMTPSA id a196sm6834456ioe.41.2015.03.01.14.10.08 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 01 Mar 2015 14:10:09 -0800 (PST) From: Tom Herbert To: davem@davemloft.net, netdev@vger.kernel.org, eric.dumazet@gmail.com, fw@strlen.de Subject: [PATCH net-next 1/6] net: Add skb_get_hash_perturb Date: Sun, 1 Mar 2015 14:09:44 -0800 Message-Id: <1425247789-21211-2-git-send-email-therbert@google.com> X-Mailer: git-send-email 2.2.0.rc0.207.ga3a616c In-Reply-To: <1425247789-21211-1-git-send-email-therbert@google.com> References: <1425247789-21211-1-git-send-email-therbert@google.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is used to get the skb->hash and then perturb it for a local use. Signed-off-by: Tom Herbert --- include/linux/skbuff.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index d898b32..48c1978 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -922,6 +923,20 @@ static inline __u32 skb_get_hash(struct sk_buff *skb) return skb->hash; } +static inline __u32 skb_get_hash_perturb(struct sk_buff *skb, + u32 perturb) +{ + u32 hash = skb_get_hash(skb); + + if (likely(hash)) { + hash = jhash_1word((__force __u32) hash, perturb); + if (unlikely(!hash)) + hash = 1; + } + + return hash; +} + static inline __u32 skb_get_hash_raw(const struct sk_buff *skb) { return skb->hash;