From patchwork Wed Mar 4 18:39:59 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Herbert X-Patchwork-Id: 446370 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 838D6140146 for ; Thu, 5 Mar 2015 05:40:29 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="verification failed; unprotected key" header.d=google.com header.i=@google.com header.b=hN93MQ4m; dkim-adsp=none (unprotected policy); dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759481AbbCDSkZ (ORCPT ); Wed, 4 Mar 2015 13:40:25 -0500 Received: from mail-ig0-f170.google.com ([209.85.213.170]:35131 "EHLO mail-ig0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759219AbbCDSkU (ORCPT ); Wed, 4 Mar 2015 13:40:20 -0500 Received: by igqa13 with SMTP id a13so39026401igq.0 for ; Wed, 04 Mar 2015 10:40:19 -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=z9qtGoMssuQUBT9XOxXmq1oSEAaRfGFDlX18U46DaNQ=; b=hN93MQ4mNz4A4sdqy3xDqBQl4oWrqoflRTyKFV6KG91CWZKJ4DDXKoFzAW2WWxF7Tz InhvMr0sfSWCa3wZshwsAk4eMtUfDd9WORV4jp+hX9hb8JaSKGeZ8EynXT+eaaRpohRZ YgFnpAXl3urKpX4eWKbkK+3oBwGbsEkSdOHw8QPv1cJS6gJsA7a/x3g1KF8YrC6/OL5A IwoxcDODvb3osJrdLuzHNegHb7PRvIlG3jU43m6nZcE/chdGb42p0+wSiuMReayR/Thv LYUGzfmj+mjtuuAp9W+0sksHA3XJ1mpuqXjg2MY3tF4fMVjzBgFIKMm8cnDa4qLoQPjd J/2g== 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=z9qtGoMssuQUBT9XOxXmq1oSEAaRfGFDlX18U46DaNQ=; b=UiJ/NN63CqjdiFgVcHSTLnxPzwR9Nhhf7NeZNsuYMlmp3VFauOnFMoXlp0VCBg20lC tgC1XvIOP3bXC8MzrDMUVdUsUFgRLM77XTmC9WlvzrJGOzj8JpyWfyrsw1BXKSjGGHZ+ /38XOs97hsQP4cO4s2DKfCao2Dr5CZEsZ5aHr8CCo7ao2ZRcxI5kvHFQ/cNPKLOZPiUU TeggrB72wYZxFaqaFK5YGOtnYRsX75+ERIMAVl8Ql2FK+uCDIse5QEERMUqHnVGATKoO Jr13VqfikAtShtvEg0SstsRhfp0BiMjT5LBsFcnDVVxavwOcxya4p2mf0zrOUIyJACX9 IsKA== X-Gm-Message-State: ALoCoQlCr4BrC9fnPdGtDHWgLy1wjK5xPyoolD+nX4PC2zq9zvuygpGypEbSvZpCIdDUxardok5a X-Received: by 10.50.93.70 with SMTP id cs6mr39921458igb.6.1425494417994; Wed, 04 Mar 2015 10:40:17 -0800 (PST) Received: from tomh.mtv.corp.google.com ([172.18.117.126]) by mx.google.com with ESMTPSA id qr1sm11161752igb.18.2015.03.04.10.40.17 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 04 Mar 2015 10:40:17 -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: Wed, 4 Mar 2015 10:39:59 -0800 Message-Id: <1425494404-24114-2-git-send-email-therbert@google.com> X-Mailer: git-send-email 2.2.0.rc0.207.ga3a616c In-Reply-To: <1425494404-24114-1-git-send-email-therbert@google.com> References: <1425494404-24114-1-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 bba1330..10572b6 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -920,6 +921,20 @@ 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;