From mboxrd@z Thu Jan 1 00:00:00 1970 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 AC32BC001DE for ; Sun, 13 Aug 2023 14:31:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229766AbjHMObu (ORCPT ); Sun, 13 Aug 2023 10:31:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229506AbjHMObu (ORCPT ); Sun, 13 Aug 2023 10:31:50 -0400 Received: from mail-ej1-f41.google.com (mail-ej1-f41.google.com [209.85.218.41]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82FC910FC for ; Sun, 13 Aug 2023 07:31:52 -0700 (PDT) Received: by mail-ej1-f41.google.com with SMTP id a640c23a62f3a-99bd67facffso81106866b.0 for ; Sun, 13 Aug 2023 07:31:52 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691937110; x=1692541910; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tUuuKbL8ydFNPda8N4HOTsW5STdP9ERZYuHURXlNIxg=; b=ZMtaCIUDIGiGELYv6fk4WnLtNi0lQmqrm6j00wr2CEL7Hdiugoim0yCav7eJCDJowm gj8U6bvbYJ+lmwgCZN7NHTXEsJRgrCPsrZLwN7NDcwxuJFnsNgoappa8tvJoLWIHskq4 Xw4upkGoCiKRmvOR9yV23IaMR9Q0FA1L+ayHrAgkGVKDcMxin6SF1XDU/otWcmutMQEH /zlGC5V3uzFTWOm00/jQdH6DxvkO6Bo1+A2I+TjqtHRhs0KYth3Pu04hA86Fqqft0j9W 4A5VU3hJvRSpJxpxVAA049qd5mLtv8Q20g6GJelRl+LBErzWZNISmU/T1BS7V8ZD0xD8 IAhw== X-Gm-Message-State: AOJu0Yzkyuw27HlSOlMU5Ebi9hXGiCtSz1AECFnD10zpSsMDux+VlL9f 09+5Jl6NTA2ewMibmEf+lO0PJ6tD4vo= X-Google-Smtp-Source: AGHT+IF7AyJqz3aIfRpSbZ9xLZ1M+kSDJRrU7dv6kXD6bIh27hcxdNqbXzo9iNEUYDD7slY/fB5r4Q== X-Received: by 2002:a17:906:74d9:b0:99c:adfb:713 with SMTP id z25-20020a17090674d900b0099cadfb0713mr5140735ejl.5.1691937110413; Sun, 13 Aug 2023 07:31:50 -0700 (PDT) Received: from localhost.localdomain (46-116-229-137.bb.netvision.net.il. [46.116.229.137]) by smtp.gmail.com with ESMTPSA id pj18-20020a170906d79200b009932337747esm4612773ejb.86.2023.08.13.07.31.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Aug 2023 07:31:49 -0700 (PDT) From: Sagi Grimberg To: stable@vger.kernel.org Cc: linux-nvme@lists.infradead.org Subject: [PATCH 5.10.y] nvme-tcp: fix potential unbalanced freeze & unfreeze Date: Sun, 13 Aug 2023 17:31:48 +0300 Message-ID: <20230813143148.12471-1-sagi@grimberg.me> X-Mailer: git-send-email 2.41.0 In-Reply-To: <2023081227-freeing-squeak-4a28@gregkh> References: <2023081227-freeing-squeak-4a28@gregkh> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ming Lei Move start_freeze into nvme_tcp_configure_io_queues(), and there is at least two benefits: 1) fix unbalanced freeze and unfreeze, since re-connection work may fail or be broken by removal 2) IO during error recovery can be failfast quickly because nvme fabrics unquiesces queues after teardown. One side-effect is that !mpath request may timeout during connecting because of queue topo change, but that looks not one big deal: 1) same problem exists with current code base 2) compared with !mpath, mpath use case is dominant Fixes: 2875b0aecabe ("nvme-tcp: fix controller reset hang during traffic") Cc: stable@vger.kernel.org Signed-off-by: Ming Lei Tested-by: Yi Zhang Reviewed-by: Sagi Grimberg Signed-off-by: Keith Busch --- drivers/nvme/host/tcp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 1dc7c733c7e3..8d67cdd844f5 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1884,6 +1884,7 @@ static int nvme_tcp_configure_io_queues(struct nvme_ctrl *ctrl, bool new) goto out_cleanup_connect_q; if (!new) { + nvme_start_freeze(ctrl); nvme_start_queues(ctrl); if (!nvme_wait_freeze_timeout(ctrl, NVME_IO_TIMEOUT)) { /* @@ -1892,6 +1893,7 @@ static int nvme_tcp_configure_io_queues(struct nvme_ctrl *ctrl, bool new) * to be safe. */ ret = -ENODEV; + nvme_unfreeze(ctrl); goto out_wait_freeze_timed_out; } blk_mq_update_nr_hw_queues(ctrl->tagset, @@ -1996,7 +1998,6 @@ static void nvme_tcp_teardown_io_queues(struct nvme_ctrl *ctrl, if (ctrl->queue_count <= 1) return; nvme_stop_admin_queue(ctrl); - nvme_start_freeze(ctrl); nvme_stop_queues(ctrl); nvme_sync_io_queues(ctrl); nvme_tcp_stop_io_queues(ctrl); -- 2.41.0