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emacs 28.1 From: Petr Machata To: Daniel Machon CC: , , , , , , , , , , , , , , , , Subject: Re: [PATCH net-next 0/6] Introduce new DCB rewrite table Date: Fri, 13 Jan 2023 17:11:50 +0100 In-Reply-To: <20230112201554.752144-1-daniel.machon@microchip.com> Message-ID: <87wn5qxu9u.fsf@nvidia.com> MIME-Version: 1.0 X-Originating-IP: [10.126.231.37] X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF0000B077:EE_|DM6PR12MB5023:EE_ X-MS-Office365-Filtering-Correlation-Id: fdbe7ac6-0666-4e11-d518-08daf584e90b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(346002)(376002)(136003)(396003)(39860400002)(451199015)(40470700004)(36840700001)(46966006)(70586007)(36756003)(2906002)(7416002)(82310400005)(7636003)(5660300002)(8936002)(356005)(41300700001)(47076005)(83380400001)(426003)(36860700001)(82740400003)(66899015)(54906003)(86362001)(70206006)(6666004)(8676002)(2616005)(40460700003)(186003)(316002)(40480700001)(478600001)(26005)(4326008)(6916009)(16526019)(336012);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Daniel Machon writes: > There is currently no support for per-port egress mapping of priority to PCP and > priority to DSCP. Some support for expressing egress mapping of PCP is supported > through ip link, with the 'egress-qos-map', however this command only maps > priority to PCP, and for vlan interfaces only. DCB APP already has support for > per-port ingress mapping of PCP/DEI, DSCP and a bunch of other stuff. So why not > take advantage of this fact, and add a new table that does the reverse. > > This patch series introduces the new DCB rewrite table. Whereas the DCB > APP table deals with ingress mapping of PID (protocol identifier) to priority, > the rewrite table deals with egress mapping of priority to PID. > > It is indeed possible to integrate rewrite in the existing APP table, by > introducing new dedicated rewrite selectors, and altering existing functions > to treat rewrite entries specially. However, I feel like this is not a good > solution, and will pollute the APP namespace. APP is well-defined in IEEE, and > some userspace relies of advertised entries - for this fact, separating APP and > rewrite into to completely separate objects, seems to me the best solution. > > The new table shares much functionality with the APP table, and as such, much > existing code is reused, or slightly modified, to work for both. > > ================================================================================ > DCB rewrite table in a nutshell > ================================================================================ > The table is implemented as a simple linked list, and uses the same lock as the > APP table. New functions for getting, setting and deleting entries have been > added, and these are exported, so they can be used by the stack or drivers. > Additionnaly, new dcbnl_setrewr and dcnl_delrewr hooks has been added, to > support hardware offload of the entries. Looks good to me overall. I just want to add that to configure rewrite, mlxsw currently reverses the APP prioritization table. That's not ideal, and is lossy as well--certain configurations simply can't be expressed however you set up in-driver heuristics. The proposed interfaces would make configuration of the rewrite functionality very straightforward. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel