From patchwork Tue Apr 25 01:02:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhijian Li (Fujitsu)" X-Patchwork-Id: 13222756 X-Patchwork-Delegate: jgg@ziepe.ca Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22C4FC7618E for ; Tue, 25 Apr 2023 01:04:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232845AbjDYBEr (ORCPT ); Mon, 24 Apr 2023 21:04:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232823AbjDYBEo (ORCPT ); Mon, 24 Apr 2023 21:04:44 -0400 Received: from mail1.bemta34.messagelabs.com (mail1.bemta34.messagelabs.com [195.245.231.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F311AB466; Mon, 24 Apr 2023 18:04:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fujitsu.com; s=170520fj; t=1682384668; i=@fujitsu.com; bh=XiPmUIcnpC67EW2xDlvmyVNqcX5XwDgK3HHE7LKvKWQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IfWKvI+U9PCZre//3RrFN8sJEfp+rOwVpD+zPQV2f64UZpS83FaeEHoFgWYW/nneF rY/OPw8LbJeKG9PCSrlYh/9rsRAKo+mVU57XrU9Ihvzga1Ttc92xxY0fYarNXLz11v oZsF/LT8HCg/7zmuTNqNq2Hc45Yqf1ZblhyZtbUj70BQYm65eARetH63NnZg101ZT5 0mLEbb4BzGQen9Qx6wR5giQBG/69Smt2XA0YPvgErm8BrPbY8bjkEjl43q9d8V44aw EoWtWkcS3bU/S/lg/jsQ4sFnp2bSUVFMMIqFF+Srm+t6k2j3STqEfnvUCHL1LWO2+g 0bkj8l0uE4seg== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpgleJIrShJLcpLzFFi42Kxs+GYpCut7p5 i8HSRtsWNaXIW205vYLeYOeMEo8XbTVNYLKb8WspscXnXHDaLZ4d6WRzYPU6/ucPksWlVJ5vH woapzB6fN8l5bP18myWANYo1My8pvyKBNePO2fnMBVuMKxr2dDA1MB7X7mLk4hAS2MIo0X70O 2MXIyeQs4JJov+FHYR9kFHixdtEEJtNQEPiXstNsBoRgSCJpWteM4E0Mwu0MkocaZrEDJIQFn CT2HtuLWsXIwcHi4CqxKFdfCBhXgFHidc7b7KB2BICChJTHr4HK+cUcJLY9LaTDWKXo8SUzTd YIOoFJU7OfAJmMwtISBx88YIZoldJ4uLXO6wQdqVE64dfLBC2msTVc5uYJzAKzkLSPgtJ+wJG plWMpsWpRWWpRbrGeklFmekZJbmJmTl6iVW6iXqppbrlqcUlukZ6ieXFeqnFxXrFlbnJOSl6e aklmxiBkZFSrCy3g/H0zr96hxglOZiURHm5wtxShPiS8lMqMxKLM+KLSnNSiw8xynBwKEnwXl B1TxESLEpNT61Iy8wBRilMWoKDR0mEd6kSUJq3uCAxtzgzHSJ1ilGXY8ODA3uZhVjy8vNSpcR 5ZUFmCIAUZZTmwY2AJYxLjLJSwryMDAwMQjwFqUW5mSWo8q8YxTkYlYR5I9WApvBk5pXAbXoF dAQT0BG7uF1AjihJREhJNTDJq381edb179q86ZpvIv9d6pErNbE78FlF4rlfTsqN9Xabe3fdP yWSOSHxdIm//qnDByYt6EzW0v539W2UpF3o56yP71VOsTh7OBoJhEfmt/xw5dwvLnCJ/4yzKg /vsvOr3q+d+shq/tplXVfWzeSvvPvPMYX7r9Lf+edUeOe2ycy14u97U6NQ8eQQg4FgcU8cq3O McMSu6uti7x4wiXqs6tCYUDFp05aJkp8sSics+ipi+sFyma1x9PcyEb70E4qpmgrenw64nvpb keAr+c9xz5JVyZz6HSoOnkYmlTNyo7OOKB8J4LxyS2j6gufyV82OqxVpT+tlr32/ddPBrz3LT f5o1i4XOVIb6Bf3mUeJpTgj0VCLuag4EQDHlm86kwMAAA== X-Env-Sender: lizhijian@fujitsu.com X-Msg-Ref: server-6.tower-571.messagelabs.com!1682384667!30602!1 X-Originating-IP: [62.60.8.146] X-SYMC-ESS-Client-Auth: outbound-route-from=pass X-StarScan-Received: X-StarScan-Version: 9.105.2; banners=-,-,- X-VirusChecked: Checked Received: (qmail 8624 invoked from network); 25 Apr 2023 01:04:27 -0000 Received: from unknown (HELO n03ukasimr02.n03.fujitsu.local) (62.60.8.146) by server-6.tower-571.messagelabs.com with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 25 Apr 2023 01:04:27 -0000 Received: from n03ukasimr02.n03.fujitsu.local (localhost [127.0.0.1]) by n03ukasimr02.n03.fujitsu.local (Postfix) with ESMTP id 602E41000DB; Tue, 25 Apr 2023 02:04:27 +0100 (BST) Received: from R01UKEXCASM223.r01.fujitsu.local (R01UKEXCASM223 [10.182.185.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by n03ukasimr02.n03.fujitsu.local (Postfix) with ESMTPS id 534CC100349; Tue, 25 Apr 2023 02:04:27 +0100 (BST) Received: from 0819309620d6.localdomain (10.167.234.230) by R01UKEXCASM223.r01.fujitsu.local (10.182.185.121) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Tue, 25 Apr 2023 02:04:24 +0100 From: Li Zhijian To: , , CC: , , , , Li Zhijian Subject: [PATCH for-next v3 3/3] RDMA/rtrs: Fix rxe_dealloc_pd warning Date: Tue, 25 Apr 2023 01:02:43 +0000 Message-ID: <1682384563-2-4-git-send-email-lizhijian@fujitsu.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1682384563-2-1-git-send-email-lizhijian@fujitsu.com> References: <1682384563-2-1-git-send-email-lizhijian@fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.234.230] X-ClientProxiedBy: G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) To R01UKEXCASM223.r01.fujitsu.local (10.182.185.121) X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org In current design: 1. PD and clt_path->s.dev are shared among connections. 2. every con[n]'s cleanup phase will call destroy_con_cq_qp() 3. clt_path->s.dev will be always decreased in destroy_con_cq_qp(), and when clt_path->s.dev become zero, it will destroy PD. 4. when con[1] failed to create, con[1] will not take clt_path->s.dev, but it try to decreased clt_path->s.dev So, in case create_cm(con[0]) succeeds but create_cm(con[1]) fails, destroy_con_cq_qp(con[1]) will be called first which will destory the PD while this PD is still taken by con[0]. Here, we refactor the error path of create_cm() and init_conns(), so that we do the cleanup in the order they are created. The warning occurs when destroying RXE PD whose reference count is not zero. ----------------------------------------------- rnbd_client L597: Mapping device /dev/nvme0n1 on session client, (access_mode: rw, nr_poll_queues: 0) ------------[ cut here ]------------ WARNING: CPU: 0 PID: 26407 at drivers/infiniband/sw/rxe/rxe_pool.c:256 __rxe_cleanup+0x13a/0x170 [rdma_rxe] Modules linked in: rpcrdma rdma_ucm ib_iser rnbd_client libiscsi rtrs_client scsi_transport_iscsi rtrs_core rdma_cm iw_cm ib_cm crc32_generic rdma_rxe udp_tunnel ib_uverbs ib_core kmem device_dax nd_pmem dax_pmem nd_ vme crc32c_intel fuse nvme_core nfit libnvdimm dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua dm_mirror dm_region_hash dm_log dm_mod CPU: 0 PID: 26407 Comm: rnbd-client.sh Kdump: loaded Not tainted 6.2.0-rc6-roce-flush+ #53 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__rxe_cleanup+0x13a/0x170 [rdma_rxe] Code: 45 84 e4 0f 84 5a ff ff ff 48 89 ef e8 5f 18 71 f9 84 c0 75 90 be c8 00 00 00 48 89 ef e8 be 89 1f fa 85 c0 0f 85 7b ff ff ff <0f> 0b 41 bc ea ff ff ff e9 71 ff ff ff e8 84 7f 1f fa e9 d0 fe ff RSP: 0018:ffffb09880b6f5f0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff99401f15d6a8 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffffbac8234b RDI: 00000000ffffffff RBP: ffff99401f15d6d0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000002d82 R11: 0000000000000000 R12: 0000000000000001 R13: ffff994101eff208 R14: ffffb09880b6f6a0 R15: 00000000fffffe00 FS: 00007fe113904740(0000) GS:ffff99413bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff6cde656c8 CR3: 000000001f108004 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rxe_dealloc_pd+0x16/0x20 [rdma_rxe] ib_dealloc_pd_user+0x4b/0x80 [ib_core] rtrs_ib_dev_put+0x79/0xd0 [rtrs_core] destroy_con_cq_qp+0x8a/0xa0 [rtrs_client] init_path+0x1e7/0x9a0 [rtrs_client] ? __pfx_autoremove_wake_function+0x10/0x10 ? lock_is_held_type+0xd7/0x130 ? rcu_read_lock_sched_held+0x43/0x80 ? pcpu_alloc+0x3dd/0x7d0 ? rtrs_clt_init_stats+0x18/0x40 [rtrs_client] rtrs_clt_open+0x24f/0x5a0 [rtrs_client] ? __pfx_rnbd_clt_link_ev+0x10/0x10 [rnbd_client] rnbd_clt_map_device+0x6a5/0xe10 [rnbd_client] Signed-off-by: Li Zhijian Acked-by: Jack Wang Tested-by: Jack Wang --- V3: comment minor fixes and add acked/tested tags V2: refactor error path instead of introducing a new flag #Leon --- drivers/infiniband/ulp/rtrs/rtrs-clt.c | 55 +++++++++++--------------- 1 file changed, 23 insertions(+), 32 deletions(-) diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c index c2065fc33a56..fe3507d29728 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c @@ -2039,6 +2039,7 @@ static int rtrs_clt_rdma_cm_handler(struct rdma_cm_id *cm_id, return 0; } +/* The caller should do the cleanup in case of error */ static int create_cm(struct rtrs_clt_con *con) { struct rtrs_path *s = con->c.path; @@ -2061,14 +2062,14 @@ static int create_cm(struct rtrs_clt_con *con) err = rdma_set_reuseaddr(cm_id, 1); if (err != 0) { rtrs_err(s, "Set address reuse failed, err: %d\n", err); - goto destroy_cm; + return err; } err = rdma_resolve_addr(cm_id, (struct sockaddr *)&clt_path->s.src_addr, (struct sockaddr *)&clt_path->s.dst_addr, RTRS_CONNECT_TIMEOUT_MS); if (err) { rtrs_err(s, "Failed to resolve address, err: %d\n", err); - goto destroy_cm; + return err; } /* * Combine connection status and session events. This is needed @@ -2083,29 +2084,15 @@ static int create_cm(struct rtrs_clt_con *con) if (err == 0) err = -ETIMEDOUT; /* Timedout or interrupted */ - goto errr; - } - if (con->cm_err < 0) { - err = con->cm_err; - goto errr; + return err; } - if (READ_ONCE(clt_path->state) != RTRS_CLT_CONNECTING) { + if (con->cm_err < 0) + return con->cm_err; + if (READ_ONCE(clt_path->state) != RTRS_CLT_CONNECTING) /* Device removal */ - err = -ECONNABORTED; - goto errr; - } + return -ECONNABORTED; return 0; - -errr: - stop_cm(con); - mutex_lock(&con->con_mutex); - destroy_con_cq_qp(con); - mutex_unlock(&con->con_mutex); -destroy_cm: - destroy_cm(con); - - return err; } static void rtrs_clt_path_up(struct rtrs_clt_path *clt_path) @@ -2333,7 +2320,7 @@ static void rtrs_clt_close_work(struct work_struct *work) static int init_conns(struct rtrs_clt_path *clt_path) { unsigned int cid; - int err; + int err, i; /* * On every new session connections increase reconnect counter @@ -2349,10 +2336,8 @@ static int init_conns(struct rtrs_clt_path *clt_path) goto destroy; err = create_cm(to_clt_con(clt_path->s.con[cid])); - if (err) { - destroy_con(to_clt_con(clt_path->s.con[cid])); + if (err) goto destroy; - } } err = alloc_path_reqs(clt_path); if (err) @@ -2363,15 +2348,21 @@ static int init_conns(struct rtrs_clt_path *clt_path) return 0; destroy: - while (cid--) { - struct rtrs_clt_con *con = to_clt_con(clt_path->s.con[cid]); + /* Make sure we do the cleanup in the order they are created */ + for (i = 0; i <= cid; i++) { + struct rtrs_clt_con *con; - stop_cm(con); + if (!clt_path->s.con[i]) + break; - mutex_lock(&con->con_mutex); - destroy_con_cq_qp(con); - mutex_unlock(&con->con_mutex); - destroy_cm(con); + con = to_clt_con(clt_path->s.con[i]); + if (con->c.cm_id) { + stop_cm(con); + mutex_lock(&con->con_mutex); + destroy_con_cq_qp(con); + mutex_unlock(&con->con_mutex); + destroy_cm(con); + } destroy_con(con); } /*