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Fri, 27 Mar 2020 17:55:57 +0000 From: Petr Machata To: netdev@vger.kernel.org Cc: Petr Machata , David Ahern Subject: [PATCH iproute2-next 2/3] man: tc-pedit: Add examples for dsfield and retain Date: Fri, 27 Mar 2020 20:55:09 +0300 Message-Id: <837315b74b1fdfc4a08362c18f3a1544d8fe1092.1585331173.git.petrm@mellanox.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: X-ClientProxiedBy: PR3P189CA0019.EURP189.PROD.OUTLOOK.COM (2603:10a6:102:52::24) To HE1PR05MB4746.eurprd05.prod.outlook.com (2603:10a6:7:a3::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dev-r-vrt-156.mtr.labs.mlnx (37.142.13.130) by PR3P189CA0019.EURP189.PROD.OUTLOOK.COM (2603:10a6:102:52::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2856.19 via Frontend Transport; Fri, 27 Mar 2020 17:55:56 +0000 X-Mailer: git-send-email 2.20.1 X-Originating-IP: [37.142.13.130] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 46278a22-8305-4a2a-af9f-08d7d2781a1e X-MS-TrafficTypeDiagnostic: HE1PR05MB3402:|HE1PR05MB3402: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:3044; 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That is useful on its own, but also it shows how retain works. Signed-off-by: Petr Machata --- man/man8/tc-pedit.8 | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/man/man8/tc-pedit.8 b/man/man8/tc-pedit.8 index b44b0263..54b91d3d 100644 --- a/man/man8/tc-pedit.8 +++ b/man/man8/tc-pedit.8 @@ -377,6 +377,28 @@ tc filter add dev eth0 parent ffff: u32 \\ action pedit ex munge tcp dport set 22 .EE .RE + +To rewrite just part of a field, use the +.B retain +directive. E.g. to overwrite the DSCP part of a dsfield with $DSCP, without +touching ECN: + +.RS +.EX +tc filter add dev eth0 ingress flower ... \\ + action pedit ex munge ip dsfield set $((DSCP << 2)) retain 0xfc +.EE +.RE + +And vice versa, to set ECN to e.g. 1 without impacting DSCP: + +.RS +.EX +tc filter add dev eth0 ingress flower ... \\ + action pedit ex munge ip dsfield set 1 retain 0x3 +.EE +.RE + .SH SEE ALSO .BR tc (8), .BR tc-htb (8),