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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jamal Hadi Salim , Cong Wang , Jiri Pirko , Vinicius Costa Gomes , linux-kernel@vger.kernel.org, intel-wired-lan@lists.osuosl.org, Muhammad Husaini Zulkifli , Peilin Ye , Pedro Tammela Subject: [PATCH RESEND net-next 0/5] Improve the taprio qdisc's relationship with its children Date: Fri, 2 Jun 2023 13:37:45 +0300 Message-Id: <20230602103750.2290132-1-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: BE1P281CA0095.DEUP281.PROD.OUTLOOK.COM (2603:10a6:b10:79::10) To AM0PR04MB6452.eurprd04.prod.outlook.com (2603:10a6:208:16d::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM0PR04MB6452:EE_|PAXPR04MB8926:EE_ X-MS-Office365-Filtering-Correlation-Id: 6b29d556-4d77-47a3-a55d-08db635579b4 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM0PR04MB6452.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(4636009)(366004)(346002)(376002)(39860400002)(136003)(396003)(451199021)(8676002)(478600001)(6506007)(1076003)(26005)(186003)(6512007)(6666004)(966005)(52116002)(6486002)(2616005)(41300700001)(83380400001)(316002)(2906002)(44832011)(8936002)(5660300002)(7416002)(66476007)(66556008)(66946007)(6916009)(54906003)(86362001)(36756003)(4326008)(38350700002)(38100700002);DIR:OUT;SFP:1101; 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This is an identical resend. ] Prompted by Vinicius' request to consolidate some child Qdisc dereferences in taprio: https://lore.kernel.org/netdev/87edmxv7x2.fsf@intel.com/ I remembered that I had left some unfinished work in this Qdisc, namely commit af7b29b1deaa ("Revert "net/sched: taprio: make qdisc_leaf() see the per-netdev-queue pfifo child qdiscs""). This patch set represents another stab at, essentially, what's in the title. Not only does taprio not properly detect when it's grafted as a non-root qdisc, but it also returns incorrect per-class stats. Eventually, Vinicius' request is addressed too, although in a different form than the one he requested (which was purely cosmetic). Review from people more experienced with Qdiscs than me would be appreciated. I tried my best to explain what I consider to be problems. I am deliberately targeting net-next because the changes are too invasive for net - they were reverted from stable once already. Vladimir Oltean (5): net/sched: taprio: don't access q->qdiscs[] in unoffloaded mode during attach() net/sched: taprio: keep child Qdisc refcount elevated at 2 in offload mode net/sched: taprio: try again to report q->qdiscs[] to qdisc_leaf() net/sched: taprio: delete misleading comment about preallocating child qdiscs net/sched: taprio: dump class stats for the actual q->qdiscs[] net/sched/sch_taprio.c | 60 ++++++++++++++++++++++++------------------ 1 file changed, 35 insertions(+), 25 deletions(-)