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Fri, 11 Sep 2020 16:33:18 +0000 From: "Scheffenegger, Richard" To: "net@FreeBSD.org" , "transport@freebsd.org" Subject: Socket option to configure Ethernet PCP / CoS per-flow Thread-Topic: Socket option to configure Ethernet PCP / CoS per-flow Thread-Index: AdaIV6Ig8St2MdM0SrW3cDX5AzmWpw== Date: Fri, 11 Sep 2020 16:33:18 +0000 Message-ID: Accept-Language: de-AT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [217.70.211.11] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b4c33195-ffb0-4dba-dad9-08d8567063db x-ms-traffictypediagnostic: SN6PR06MB3904: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:5236; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: I/cQiVSwJ1a5+ifkSbFUYJGlUp8He2p8TWL98sazuE8wYmYZXidjjx+z9JWQ1ZSifNnl6n+SPwa3i4QgQaqC+hEmtxwgq7yQWMdzUf4TdB5QYK8zshYNqq97Rbx6cYXIr6OINVD1qYS3YldqCwIRgaShuKECgfPy5h/WkYYq0iPv//mpTJDzsIySSgTbs0L6qwkmbmJT3TZ6dYogPhwlpdA50kC/QZT/YsmiFbN/uuIlMJkjrufPAH/z5EkVnqayDLpbs/0Wq/nmYJr6e/NoDMe14I4RnKgyx8j9CVIVjUEFwMkCmkBTxY/7r5z9b1jgsUf5GIm+7bBOcuURDE6poA== x-forefront-antispam-report: CIP:255.255.255.255; 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MAILMAN_DEST(0.00)[net,transport]; RWL_MAILSPIKE_POSSIBLE(0.00)[40.107.237.85:from] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.33 X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Sep 2020 16:33:21 -0000 Hi, Currently, upstream head has only an IOCTL API to set up interface-wide def= ault PCP marking: #define SIOCGVLANPCP SIOCGLANPCP /* Get VLAN PCP */ #define SIOCSVLANPCP SIOCSLANPCP /* Set VLAN PCP */ And the interface is via ifconfig pcp . However, while this allows all traffic sent via a specific interface to be = marked with a PCP (priority code point), it defeats the purpose of PFC (pri= ority flow control) which works by individually pausing different queues of= an interface, provided there is an actual differentiation of traffic into = those various classes. Internally, we have added a socket option (SO_VLAN_PCP) to change the PCP s= pecifically for traffic associated with that socket, to be marked different= ly from whatever the interface default is (unmarked, or the default PCP). Does the community see value in having such a socket option widely availabl= e? (Linux currently doesn't seem to have a per-socket option either, only a= per-interface IOCTL API). Best regards, Richard Scheffenegger