From patchwork Mon Feb 24 10:49:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Selvin Xavier X-Patchwork-Id: 11400203 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 714B11395 for ; Mon, 24 Feb 2020 10:50:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 479CB20828 for ; Mon, 24 Feb 2020 10:50:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="LVJiV9zp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726765AbgBXKuQ (ORCPT ); Mon, 24 Feb 2020 05:50:16 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:38113 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726778AbgBXKuQ (ORCPT ); Mon, 24 Feb 2020 05:50:16 -0500 Received: by mail-wr1-f68.google.com with SMTP id e8so9807452wrm.5 for ; Mon, 24 Feb 2020 02:50:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=BmppQlbJRz0w8KNJ0nbzuNuPVPH7cIIQhQrpCUHRnOY=; b=LVJiV9zp34c+6J6pdTB1DKDBB0ncHQ0DQWS9JVdJPnnraQBAuBGAOYpepMMapf5XgH tdV66jlyuywedywY52gAaCaZ2VpppJeIqvUxg7rPX1fGp0J3GZq6pVqw510tKgUomfrK aqyaaRT6hAVvX+t+gv87ps5oFPZC1ncS1R8/A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=BmppQlbJRz0w8KNJ0nbzuNuPVPH7cIIQhQrpCUHRnOY=; b=tqPpgSnET+iOTJDEKGNl8bJcd68VL8sFZSAlIqqMCMHJ0iPznxuGSu0wrJFpdxcJKT rB7rqS+6xIeklfF4WGAYQFvvpLvQYWxB+c5tGvzQHRGrFPJdO2p7+Ys+KfQ4fyIf0FGY YZMGt2OpKYPUKvXuLHtGuNy+Cp5W54VeWRinSHfulUX8mn08ZaosuRWK3Gbk/HWR+HZg 0mUb6u2mBiwZ4vMAfAVbb/0Ow2lfQ453vTQrSst118hc0DeZIrwzdyt6LmhLjOK+eiVu nkzO/Ls/P/T6rJaTFO3JfVsfGurM8eJW6i5SjEhtgwxR4wB9SV3Am4wzCuEDiJ0WRtoP +m/g== X-Gm-Message-State: APjAAAU9suPZb85Rd4mF4ricuNIyTiySEefC9QI0ublQdYdGsDZO2jHM 4g1/8YVFqllrYbWmOEVs1Pl6Tg== X-Google-Smtp-Source: APXvYqz/g3v0Xw5V1SCjcI5bkUHB24x5mvxYdmGWWeJeSJlaWJYFzUHrgg66iWsfzQFT9PM7z6N41A== X-Received: by 2002:adf:db48:: with SMTP id f8mr62540198wrj.146.1582541413697; Mon, 24 Feb 2020 02:50:13 -0800 (PST) Received: from dhcp-10-192-206-197.iig.avagotech.net.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id c9sm18096426wrq.44.2020.02.24.02.50.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Feb 2020 02:50:13 -0800 (PST) From: Selvin Xavier To: dledford@redhat.com, jgg@mellanox.com Cc: linux-rdma@vger.kernel.org, Selvin Xavier Subject: [PATCH for-next v2 3/3] RDMA/bnxt_re: Use driver_unregister and unregistration API Date: Mon, 24 Feb 2020 02:49:55 -0800 Message-Id: <1582541395-19409-4-git-send-email-selvin.xavier@broadcom.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1582541395-19409-1-git-send-email-selvin.xavier@broadcom.com> References: <1582541395-19409-1-git-send-email-selvin.xavier@broadcom.com> Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Using the new unregister APIs provided by the core. Provide the dealloc_driver hook for the core to callback at the time of device un-registration. bnxt_re VF resources are created by the corresponding PF driver. During ib_unregister_driver, PF might get removed before VF and this could cause failure when VFs are removed. Driver is explicitly queuing the removal of VF devices before calling ib_unregister_driver. Commands to any VFs after the PF removal will timeout and driver will proceed with unregisteration and free up the host resources. Signed-off-by: Selvin Xavier --- drivers/infiniband/hw/bnxt_re/main.c | 105 +++++++++++++++-------------------- 1 file changed, 44 insertions(+), 61 deletions(-) diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c index 3a548b1..6dec09d 100644 --- a/drivers/infiniband/hw/bnxt_re/main.c +++ b/drivers/infiniband/hw/bnxt_re/main.c @@ -79,7 +79,8 @@ static struct list_head bnxt_re_dev_list = LIST_HEAD_INIT(bnxt_re_dev_list); static DEFINE_MUTEX(bnxt_re_dev_lock); static struct workqueue_struct *bnxt_re_wq; static void bnxt_re_remove_device(struct bnxt_re_dev *rdev); -static void bnxt_re_ib_uninit(struct bnxt_re_dev *rdev); +static void bnxt_re_dealloc_driver(struct ib_device *ib_dev); +static void bnxt_re_stop_irq(void *handle); static void bnxt_re_destroy_chip_ctx(struct bnxt_re_dev *rdev) { @@ -237,10 +238,10 @@ static void bnxt_re_shutdown(void *p) if (!rdev) return; - - bnxt_re_ib_uninit(rdev); ASSERT_RTNL(); - bnxt_re_remove_device(rdev); + /* Release the MSIx vectors before queuing unregister */ + bnxt_re_stop_irq(rdev); + ib_unregister_device_queued(&rdev->ibdev); } static void bnxt_re_stop_irq(void *handle) @@ -542,17 +543,12 @@ static bool is_bnxt_re_dev(struct net_device *netdev) static struct bnxt_re_dev *bnxt_re_from_netdev(struct net_device *netdev) { - struct bnxt_re_dev *rdev; + struct ib_device *ibdev = + ib_device_get_by_netdev(netdev, RDMA_DRIVER_BNXT_RE); + if (!ibdev) + return NULL; - rcu_read_lock(); - list_for_each_entry_rcu(rdev, &bnxt_re_dev_list, list) { - if (rdev->netdev == netdev) { - rcu_read_unlock(); - return rdev; - } - } - rcu_read_unlock(); - return NULL; + return container_of(ibdev, struct bnxt_re_dev, ibdev); } static void bnxt_re_dev_unprobe(struct net_device *netdev, @@ -626,11 +622,6 @@ static const struct attribute_group bnxt_re_dev_attr_group = { .attrs = bnxt_re_attributes, }; -static void bnxt_re_unregister_ib(struct bnxt_re_dev *rdev) -{ - ib_unregister_device(&rdev->ibdev); -} - static const struct ib_device_ops bnxt_re_dev_ops = { .owner = THIS_MODULE, .driver_id = RDMA_DRIVER_BNXT_RE, @@ -645,6 +636,7 @@ static const struct ib_device_ops bnxt_re_dev_ops = { .create_cq = bnxt_re_create_cq, .create_qp = bnxt_re_create_qp, .create_srq = bnxt_re_create_srq, + .dealloc_driver = bnxt_re_dealloc_driver, .dealloc_pd = bnxt_re_dealloc_pd, .dealloc_ucontext = bnxt_re_dealloc_ucontext, .del_gid = bnxt_re_del_gid, @@ -741,15 +733,11 @@ static void bnxt_re_dev_remove(struct bnxt_re_dev *rdev) { dev_put(rdev->netdev); rdev->netdev = NULL; - mutex_lock(&bnxt_re_dev_lock); list_del_rcu(&rdev->list); mutex_unlock(&bnxt_re_dev_lock); synchronize_rcu(); - - ib_dealloc_device(&rdev->ibdev); - /* rdev is gone */ } static struct bnxt_re_dev *bnxt_re_dev_add(struct net_device *netdev, @@ -1320,15 +1308,6 @@ static void bnxt_re_query_hwrm_intf_version(struct bnxt_re_dev *rdev) le16_to_cpu(resp.hwrm_intf_patch); } -static void bnxt_re_ib_uninit(struct bnxt_re_dev *rdev) -{ - /* Cleanup ib dev */ - if (test_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags)) { - ib_unregister_device(&rdev->ibdev); - clear_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags); - } -} - int bnxt_re_ib_init(struct bnxt_re_dev *rdev) { int rc = 0; @@ -1355,10 +1334,6 @@ static void bnxt_re_dev_uninit(struct bnxt_re_dev *rdev) u8 type; int rc; - if (test_and_clear_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags)) { - /* Cleanup ib dev */ - bnxt_re_unregister_ib(rdev); - } if (test_and_clear_bit(BNXT_RE_FLAG_QOS_WORK_REG, &rdev->flags)) cancel_delayed_work_sync(&rdev->worker); @@ -1627,6 +1602,19 @@ static int bnxt_re_add_device(struct bnxt_re_dev **rdev, return rc; } +static void bnxt_re_dealloc_driver(struct ib_device *ib_dev) +{ + struct bnxt_re_dev *rdev = + container_of(ib_dev, struct bnxt_re_dev, ibdev); + + clear_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags); + dev_info(rdev_to_dev(rdev), "Unregistering Device"); + + rtnl_lock(); + bnxt_re_remove_device(rdev); + rtnl_unlock(); +} + /* Handle all deferred netevents tasks */ static void bnxt_re_task(struct work_struct *work) { @@ -1701,6 +1689,7 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier, struct bnxt_re_dev *rdev; int rc = 0; bool sch_work = false; + bool release = true; real_dev = rdma_vlan_dev_real_dev(netdev); if (!real_dev) @@ -1708,7 +1697,8 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier, rdev = bnxt_re_from_netdev(real_dev); if (!rdev && event != NETDEV_REGISTER) - goto exit; + return NOTIFY_OK; + if (real_dev != netdev) goto exit; @@ -1719,6 +1709,7 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier, rc = bnxt_re_add_device(&rdev, real_dev); if (!rc) sch_work = true; + release = false; break; case NETDEV_UNREGISTER: @@ -1727,8 +1718,7 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier, */ if (atomic_read(&rdev->sched_count) > 0) goto exit; - bnxt_re_ib_uninit(rdev); - bnxt_re_remove_device(rdev); + ib_unregister_device_queued(&rdev->ibdev); break; default: @@ -1750,6 +1740,8 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier, } exit: + if (rdev && release) + ib_device_put(&rdev->ibdev); return NOTIFY_DONE; } @@ -1785,32 +1777,23 @@ static int __init bnxt_re_mod_init(void) static void __exit bnxt_re_mod_exit(void) { - struct bnxt_re_dev *rdev, *next; - LIST_HEAD(to_be_deleted); + struct bnxt_re_dev *rdev; + flush_workqueue(bnxt_re_wq); mutex_lock(&bnxt_re_dev_lock); - /* Free all adapter allocated resources */ - if (!list_empty(&bnxt_re_dev_list)) - list_splice_init(&bnxt_re_dev_list, &to_be_deleted); - mutex_unlock(&bnxt_re_dev_lock); - /* - * Cleanup the devices in reverse order so that the VF device - * cleanup is done before PF cleanup - */ - list_for_each_entry_safe_reverse(rdev, next, &to_be_deleted, list) { - ibdev_info(&rdev->ibdev, "Unregistering Device"); - /* - * Flush out any scheduled tasks before destroying the - * resources + list_for_each_entry(rdev, &bnxt_re_dev_list, list) { + /* VF device removal should be called before the removal + * of PF device. Queue VFs unregister first, so that VFs + * shall be removed before the PF during the call of + * ib_unregister_driver. Commands to any VFs after the + * PF removal will timeout and driver will proceed with + * unregisteration and free up the host resources. */ - flush_workqueue(bnxt_re_wq); - bnxt_re_dev_stop(rdev); - bnxt_re_ib_uninit(rdev); - /* Acquire the rtnl_lock as the L2 resources are freed here */ - rtnl_lock(); - bnxt_re_remove_device(rdev); - rtnl_unlock(); + if (rdev->is_virtfn) + ib_unregister_device_queued(&rdev->ibdev); } + mutex_unlock(&bnxt_re_dev_lock); + ib_unregister_driver(RDMA_DRIVER_BNXT_RE); unregister_netdevice_notifier(&bnxt_re_netdev_notifier); if (bnxt_re_wq) destroy_workqueue(bnxt_re_wq);