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 71C7FC433E1 for ; Sat, 8 Aug 2020 23:51:20 +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 41F0822BF5 for ; Sat, 8 Aug 2020 23:51:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="1ozKTpZ7"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="iGW1vbYo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 41F0822BF5 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=r/MafVGcggwoxkKZYg8EaqMigIVvKa24aqY5AUvgzJs=; b=1ozKTpZ7yBgToTwQI2Wtgt2eP ZNCzn/Aar4BuhfCDlth4VMo/BFepKK6Ng+RXEAhVGxSsHJavYwPJSeSg7wtgMRz6jRm/0PUggWSxe X6v0tvTK2mjzMBNz4/zrTf9NFerh7lbCds9wyMuMXqUCNVYoS/sBs4IIzYwbqyZTPqFfA4vrFKJnV fQl1L+57kL4rQSogVk/NYbo2wwLGJZsxmSaIRGhfMBZl5ZEDZlgNedny7KbN6hQd4YnIDUwYAe9lc oPIn9Dhm9cCa5Nn51/0e8AJlB+dxdn5g5E0LwVxg1mcAg1P41p4hppH0ZOTCqWp/s6d7auGFZRCgt clL5vLXhQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k4YcN-00044z-4I; Sat, 08 Aug 2020 23:51:15 +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 1k4YR8-0002W4-GN for linux-nvme@lists.infradead.org; Sat, 08 Aug 2020 23:39:40 +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 4BBC221744; Sat, 8 Aug 2020 23:39:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596929978; bh=mDvJv/VK+kao2IarrXzUF5c67w22XnuUMVb8zUHLb6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iGW1vbYoF5K6gvmcicE48A399i24RnoqYzA/c6G3YzuIw5IoTNCgGJDt0QUM0mY9A 8m5X5vZBI0yQGmzUW0opg3B60bsIJFvBDj3QvV3nPxmH2cS9prQuUDIZZxrzl5X4Ho mDd/ogtBIFCVvYJlMQ2IdCN7r4pm5pnSt3ScYl0o= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 38/40] nvme-rdma: fix controller reset hang during traffic Date: Sat, 8 Aug 2020 19:38:42 -0400 Message-Id: <20200808233844.3618823-38-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808233844.3618823-1-sashal@kernel.org> References: <20200808233844.3618823-1-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_193939_596619_07C89381 X-CRM114-Status: GOOD ( 15.05 ) 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 9f98772ba307dd89a3d17dc2589f213d3972fc64 ] 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/rdma.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index cd0d499781908..d0336545e1fe0 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -890,15 +890,20 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new) ret = PTR_ERR(ctrl->ctrl.connect_q); goto out_free_tag_set; } - } else { - blk_mq_update_nr_hw_queues(&ctrl->tag_set, - ctrl->ctrl.queue_count - 1); } ret = nvme_rdma_start_io_queues(ctrl); if (ret) goto out_cleanup_connect_q; + if (!new) { + nvme_start_queues(&ctrl->ctrl); + nvme_wait_freeze(&ctrl->ctrl); + blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset, + ctrl->ctrl.queue_count - 1); + nvme_unfreeze(&ctrl->ctrl); + } + return 0; out_cleanup_connect_q: @@ -931,6 +936,7 @@ static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl, bool remove) { if (ctrl->ctrl.queue_count > 1) { + nvme_start_freeze(&ctrl->ctrl); nvme_stop_queues(&ctrl->ctrl); nvme_rdma_stop_io_queues(ctrl); if (ctrl->ctrl.tagset) { -- 2.25.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme