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Miller" Cc: Florian Fainelli , Andrew Lunn , Vivien Didelot , Vladimir Oltean , Kurt Kanzenbach , Hauke Mehrtens , Egil Hjelmeland Subject: [PATCH net 4/4] net: dsa: sja1105: fix broken backpressure in .port_fdb_dump Date: Tue, 10 Aug 2021 14:19:56 +0300 Message-Id: <20210810111956.1609499-5-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210810111956.1609499-1-vladimir.oltean@nxp.com> References: <20210810111956.1609499-1-vladimir.oltean@nxp.com> X-ClientProxiedBy: PR3P195CA0007.EURP195.PROD.OUTLOOK.COM (2603:10a6:102:b6::12) To VI1PR04MB5136.eurprd04.prod.outlook.com (2603:10a6:803:55::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (188.25.144.60) by PR3P195CA0007.EURP195.PROD.OUTLOOK.COM (2603:10a6:102:b6::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.17 via Frontend Transport; Tue, 10 Aug 2021 11:20:12 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3a4c1655-1691-4cd5-352e-08d95bf0d25d X-MS-TrafficTypeDiagnostic: VI1PR04MB4686: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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:VI1PR04MB5136.eurprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(376002)(346002)(396003)(39860400002)(136003)(7416002)(86362001)(6486002)(6512007)(36756003)(956004)(44832011)(2616005)(8676002)(316002)(4326008)(6506007)(66476007)(52116002)(66556008)(66946007)(26005)(186003)(478600001)(38350700002)(38100700002)(2906002)(1076003)(8936002)(5660300002)(110136005)(54906003)(6666004)(83380400001)(142923001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3a4c1655-1691-4cd5-352e-08d95bf0d25d X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5136.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2021 11:20:13.0517 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: dL5hw5DSK377DWIF/WqefcQjlBHxY59cuwEWYaNpwo2QB47sP4opn3I9mjfXZWNi4x0XTIP8Cx1HBcj0br1P2w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB4686 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org rtnl_fdb_dump() has logic to split a dump of PF_BRIDGE neighbors into multiple netlink skbs if the buffer provided by user space is too small (one buffer will typically handle a few hundred FDB entries). When the current buffer becomes full, nlmsg_put() in dsa_slave_port_fdb_do_dump() returns -EMSGSIZE and DSA saves the index of the last dumped FDB entry, returns to rtnl_fdb_dump() up to that point, and then the dump resumes on the same port with a new skb, and FDB entries up to the saved index are simply skipped. Since dsa_slave_port_fdb_do_dump() is pointed to by the "cb" passed to drivers, then drivers must check for the -EMSGSIZE error code returned by it. Otherwise, when a netlink skb becomes full, DSA will no longer save newly dumped FDB entries to it, but the driver will continue dumping. So FDB entries will be missing from the dump. Fix the broken backpressure by propagating the "cb" return code and allow rtnl_fdb_dump() to restart the FDB dump with a new skb. Fixes: 291d1e72b756 ("net: dsa: sja1105: Add support for FDB and MDB management") Signed-off-by: Vladimir Oltean --- drivers/net/dsa/sja1105/sja1105_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index 8667c9754330..b188a80eeec6 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -1635,7 +1635,9 @@ static int sja1105_fdb_dump(struct dsa_switch *ds, int port, /* We need to hide the dsa_8021q VLANs from the user. */ if (priv->vlan_state == SJA1105_VLAN_UNAWARE) l2_lookup.vlanid = 0; - cb(macaddr, l2_lookup.vlanid, l2_lookup.lockeds, data); + rc = cb(macaddr, l2_lookup.vlanid, l2_lookup.lockeds, data); + if (rc) + return rc; } return 0; }