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Miller" , Jakub Kicinski Cc: netdev@vger.kernel.org, UNGLinuxDriver@microchip.com, Alexandre Belloni , Andrew Lunn , Florian Fainelli , Vivien Didelot , Horatiu Vultur , "Allan W . Nielsen" , Claudiu Manoil , Steen Hegelund Subject: [PATCH v3 net-next] net: mscc: ocelot: install MAC addresses in .ndo_set_rx_mode from process context Date: Sat, 5 Dec 2020 02:43:15 +0200 Message-Id: <20201205004315.143851-1-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.25.1 X-Originating-IP: [188.25.2.120] X-ClientProxiedBy: VI1P195CA0027.EURP195.PROD.OUTLOOK.COM (2603:10a6:802:5a::16) To VI1PR04MB5696.eurprd04.prod.outlook.com (2603:10a6:803:e7::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (188.25.2.120) by VI1P195CA0027.EURP195.PROD.OUTLOOK.COM (2603:10a6:802:5a::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3632.17 via Frontend Transport; Sat, 5 Dec 2020 00:43:25 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: fff65445-fea5-4a8a-c6b4-08d898b6c698 X-MS-TrafficTypeDiagnostic: VI1PR0402MB3407: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1850; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: d9ovDEpz8UybJhLiQ2qPfN/TiWgzBqg1uwpgbxWOR1cGQux5hLEXqIELt8nOjd7mwHtQVYK/gOpbD/pxxfOw6TTSg05KZ6IJpt/QXCSo8MMcTUm+qFcafjy1BxFdz7ND04VgxJWpk4ADf9rr6mzerl6jR3HvbhuT/ZPHNSydMEkedwcnmQPpYs0ZOZXxsLAwIcrXLdZTyh/CIxgkkUEfgO6uTMSSNDN4n3kq4AcBZs8btECWHSDYnl5cn52eKyxiVmRNRn3Rl3GP8MeUAPzq89KpyTSLXi0VFQNCD1/PzUUlhUqDoLmtpFTJromfqm2c3IPHFy4k4SASNj588bAt3aXpxoxOwkoHzWxruluAOMNb7H3C6py9J4LJi3A3uzHTnlJS88bnXb9QhC5Ff1ZmiaYdpEbXxk9noKi5BZjp6+k= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:VI1PR04MB5696.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(39860400002)(366004)(396003)(376002)(346002)(136003)(86362001)(44832011)(6506007)(26005)(66556008)(16526019)(5660300002)(66946007)(2906002)(956004)(2616005)(8676002)(4326008)(69590400008)(186003)(7416002)(316002)(1076003)(52116002)(54906003)(66476007)(110136005)(6666004)(8936002)(6486002)(83380400001)(6512007)(36756003)(478600001)(142923001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: fff65445-fea5-4a8a-c6b4-08d898b6c698 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5696.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2020 00:43:25.8744 (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: q44/gqsBuRnAdhNKP1QtO+aIzKJ4nvBgSW39fsxrjpMC/vPBALucAL5W5MmOUeSbVZHa0EzdSoexWyORrB1mUw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0402MB3407 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Currently ocelot_set_rx_mode calls ocelot_mact_learn directly, which has a very nice ocelot_mact_wait_for_completion at the end. Introduced in commit 639c1b2625af ("net: mscc: ocelot: Register poll timeout should be wall time not attempts"), this function uses readx_poll_timeout which triggers a lot of lockdep warnings and is also dangerous to use from atomic context, potentially leading to lockups and panics. Steen Hegelund added a poll timeout of 100 ms for checking the MAC table, a duration which is clearly absurd to poll in atomic context. So we need to defer the MAC table access to process context, which we do via a dynamically allocated workqueue which contains all there is to know about the MAC table operation it has to do. Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli --- Changes in v3: - Dropped Fixes tag and retargeted to net-next - Dropped get_device/put_device since they don't offer real protection - Now allocating a private ordered workqueue which is drained on unbind to avoid accessing freed memory Changes in v2: - Added Fixes tag (it won't backport that far, but anyway) - Using get_device and put_device to avoid racing with unbind drivers/net/ethernet/mscc/ocelot.c | 5 ++ drivers/net/ethernet/mscc/ocelot_net.c | 81 +++++++++++++++++++++++++- include/soc/mscc/ocelot.h | 2 + 3 files changed, 85 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c index abea8dd2b0cb..b9626eec8db6 100644 --- a/drivers/net/ethernet/mscc/ocelot.c +++ b/drivers/net/ethernet/mscc/ocelot.c @@ -1513,6 +1513,10 @@ int ocelot_init(struct ocelot *ocelot) if (!ocelot->stats_queue) return -ENOMEM; + ocelot->owq = alloc_ordered_workqueue("ocelot-owq", WQ_MEM_RECLAIM); + if (!ocelot->owq) + return -ENOMEM; + INIT_LIST_HEAD(&ocelot->multicast); INIT_LIST_HEAD(&ocelot->pgids); ocelot_mact_init(ocelot); @@ -1619,6 +1623,7 @@ void ocelot_deinit(struct ocelot *ocelot) { cancel_delayed_work(&ocelot->stats_work); destroy_workqueue(ocelot->stats_queue); + destroy_workqueue(ocelot->owq); mutex_destroy(&ocelot->stats_lock); } EXPORT_SYMBOL(ocelot_deinit); diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c index c65ae6f75a16..9ba7e2b166e9 100644 --- a/drivers/net/ethernet/mscc/ocelot_net.c +++ b/drivers/net/ethernet/mscc/ocelot_net.c @@ -414,13 +414,82 @@ static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_OK; } +enum ocelot_action_type { + OCELOT_MACT_LEARN, + OCELOT_MACT_FORGET, +}; + +struct ocelot_mact_work_ctx { + struct work_struct work; + struct ocelot *ocelot; + enum ocelot_action_type type; + union { + /* OCELOT_MACT_LEARN */ + struct { + int pgid; + enum macaccess_entry_type entry_type; + unsigned char addr[ETH_ALEN]; + u16 vid; + } learn; + /* OCELOT_MACT_FORGET */ + struct { + unsigned char addr[ETH_ALEN]; + u16 vid; + } forget; + }; +}; + +#define ocelot_work_to_ctx(x) \ + container_of((x), struct ocelot_mact_work_ctx, work) + +static void ocelot_mact_work(struct work_struct *work) +{ + struct ocelot_mact_work_ctx *w = ocelot_work_to_ctx(work); + struct ocelot *ocelot = w->ocelot; + + switch (w->type) { + case OCELOT_MACT_LEARN: + ocelot_mact_learn(ocelot, w->learn.pgid, w->learn.addr, + w->learn.vid, w->learn.entry_type); + break; + case OCELOT_MACT_FORGET: + ocelot_mact_forget(ocelot, w->forget.addr, w->forget.vid); + break; + default: + break; + }; + + kfree(w); +} + +static int ocelot_enqueue_mact_action(struct ocelot *ocelot, + const struct ocelot_mact_work_ctx *ctx) +{ + struct ocelot_mact_work_ctx *w = kmalloc(sizeof(*w), GFP_ATOMIC); + + if (!w) + return -ENOMEM; + + memcpy(w, ctx, sizeof(*w)); + w->ocelot = ocelot; + INIT_WORK(&w->work, ocelot_mact_work); + queue_work(ocelot->owq, &w->work); + + return 0; +} + static int ocelot_mc_unsync(struct net_device *dev, const unsigned char *addr) { struct ocelot_port_private *priv = netdev_priv(dev); struct ocelot_port *ocelot_port = &priv->port; struct ocelot *ocelot = ocelot_port->ocelot; + struct ocelot_mact_work_ctx w; + + ether_addr_copy(w.forget.addr, addr); + w.forget.vid = ocelot_port->pvid_vlan.vid; + w.type = OCELOT_MACT_FORGET; - return ocelot_mact_forget(ocelot, addr, ocelot_port->pvid_vlan.vid); + return ocelot_enqueue_mact_action(ocelot, &w); } static int ocelot_mc_sync(struct net_device *dev, const unsigned char *addr) @@ -428,9 +497,15 @@ static int ocelot_mc_sync(struct net_device *dev, const unsigned char *addr) struct ocelot_port_private *priv = netdev_priv(dev); struct ocelot_port *ocelot_port = &priv->port; struct ocelot *ocelot = ocelot_port->ocelot; + struct ocelot_mact_work_ctx w; + + ether_addr_copy(w.learn.addr, addr); + w.learn.vid = ocelot_port->pvid_vlan.vid; + w.learn.pgid = PGID_CPU; + w.learn.entry_type = ENTRYTYPE_LOCKED; + w.type = OCELOT_MACT_LEARN; - return ocelot_mact_learn(ocelot, PGID_CPU, addr, - ocelot_port->pvid_vlan.vid, ENTRYTYPE_LOCKED); + return ocelot_enqueue_mact_action(ocelot, &w); } static void ocelot_set_rx_mode(struct net_device *dev) diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h index 731116611390..2f4cd3288bcc 100644 --- a/include/soc/mscc/ocelot.h +++ b/include/soc/mscc/ocelot.h @@ -650,6 +650,8 @@ struct ocelot { struct delayed_work stats_work; struct workqueue_struct *stats_queue; + struct workqueue_struct *owq; + u8 ptp:1; struct ptp_clock *ptp_clock; struct ptp_clock_info ptp_info;