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 X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EDB1FC433DF for ; Sat, 8 Aug 2020 23:42:25 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B862220658 for ; Sat, 8 Aug 2020 23:42:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="WeHoI8n0"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="KViAebb0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B862220658 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MfHBdx8IGtsl76PW/gJ7cbN8tq7qugV0Jck6uNmM1yw=; b=WeHoI8n0cTcp3NUxbDvGmtEgk S2AnWKOaF7OKJRdGOrWYLtlf/yP/d3TPPwnFONTzxxEbgGSWDoPenme8Tp8P/XOPASwfHvbJFS9Ib Q7O/had+zVrq904uJ1KCGgYwu8G0D97CHHZ/pU7BA6jRP5Ygj7QxI0pjh/26PIFN8erfIndwYKsPP I9CAG8F8NWftxDCiuHwjpFNyK21zI0AJkd3A4oQ7YdwNagtv8RwP6Un9z97Bc45mRIMHLQiDh+lMr Gpe3glf7csuXl+QeCLXz7bNA7NY0ASVvRVKqHrm+DryvI4jCi1sutQlGCkiN6cNPGxRECJGQMglNa MrrbbTNVg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k4YTZ-0003kZ-Jd; Sat, 08 Aug 2020 23:42:09 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k4YOr-0001L9-Q2 for linux-nvme@lists.infradead.org; Sat, 08 Aug 2020 23:37:18 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0605420716; Sat, 8 Aug 2020 23:37:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596929836; bh=n4p+AeW6JiuIsLx1WW7NJfTXfksep1+709oM9kBwEgI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KViAebb0CFrW9Tm9xR+XkQvF25HJvWtBFXXG2ijKVVNkQv37xAm7EIAsEYnMFryy7 +YUnMas5wNs+OZqckMUQ7DlVGkTdyAOsVavhn8JMK0J2HHO/yjg4A+dB/6Gf7JdraY w5/8rgW5mRlJxMpT03aTj+C+Sau/q9e8sE2BGm3I= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 67/72] nvme-tcp: fix controller reset hang during traffic Date: Sat, 8 Aug 2020 19:35:36 -0400 Message-Id: <20200808233542.3617339-67-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808233542.3617339-1-sashal@kernel.org> References: <20200808233542.3617339-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200808_193718_043695_FD12755D X-CRM114-Status: GOOD ( 14.84 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Sagi Grimberg , linux-nvme@lists.infradead.org, Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: Sagi Grimberg [ Upstream commit 2875b0aecabe2f081a8432e2bc85b85df0529490 ] commit fe35ec58f0d3 ("block: update hctx map when use multiple maps") exposed an issue where we may hang trying to wait for queue freeze during I/O. We call blk_mq_update_nr_hw_queues which in case of multiple queue maps (which we have now for default/read/poll) is attempting to freeze the queue. However we never started queue freeze when starting the reset, which means that we have inflight pending requests that entered the queue that we will not complete once the queue is quiesced. So start a freeze before we quiesce the queue, and unfreeze the queue after we successfully connected the I/O queues (and make sure to call blk_mq_update_nr_hw_queues only after we are sure that the queue was already frozen). This follows to how the pci driver handles resets. Fixes: fe35ec58f0d3 ("block: update hctx map when use multiple maps") Signed-off-by: Sagi Grimberg Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- drivers/nvme/host/tcp.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index f3a91818167b1..83bb329d4113a 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1744,15 +1744,20 @@ static int nvme_tcp_configure_io_queues(struct nvme_ctrl *ctrl, bool new) ret = PTR_ERR(ctrl->connect_q); goto out_free_tag_set; } - } else { - blk_mq_update_nr_hw_queues(ctrl->tagset, - ctrl->queue_count - 1); } ret = nvme_tcp_start_io_queues(ctrl); if (ret) goto out_cleanup_connect_q; + if (!new) { + nvme_start_queues(ctrl); + nvme_wait_freeze(ctrl); + blk_mq_update_nr_hw_queues(ctrl->tagset, + ctrl->queue_count - 1); + nvme_unfreeze(ctrl); + } + return 0; out_cleanup_connect_q: @@ -1857,6 +1862,7 @@ static void nvme_tcp_teardown_io_queues(struct nvme_ctrl *ctrl, { if (ctrl->queue_count <= 1) return; + nvme_start_freeze(ctrl); nvme_stop_queues(ctrl); nvme_tcp_stop_io_queues(ctrl); if (ctrl->tagset) { -- 2.25.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme