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 ED5BDC433DF for ; Sat, 8 Aug 2020 23:47:08 +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 BA17720672 for ; Sat, 8 Aug 2020 23:47:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="2TdYMOgj"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="C/0cVK1h" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BA17720672 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=tq2wlO2IBBGBxBaZX+Byhil1QM3jzzIifQvbcg/5SjQ=; b=2TdYMOgjXv04RlRdVPCWZOlaU xsXAIcwbxN/LioA3gzhfJ358q0VQka0x1c5rjXyZJwbQNyyjxHRPqdZolmncl6in6lzsV8W3DANZa bPopsV5ixno9fZzXITQvG5k6+FI67m6pmfwrkeA02uOvhlWior72oosxskBaklXsaLDqsrtHftVkt WSvcO3dn+AeV3L3V69R2lUHXeiXbli2uszw9Eb90UyjF+qAbVV/N5PRHqK3lFSTx8QAS/8XvnJsOo JIAs+7GAHck9N7vfDZfac+YNXUpVxaIPPJDpZlnFbx7rKiNikTH1RcNiMmTuaGCcWDUYl3HOlDKnH mFixO7jfw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k4YYH-00019W-K5; Sat, 08 Aug 2020 23:47:01 +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 1k4YQC-00025b-22 for linux-nvme@lists.infradead.org; Sat, 08 Aug 2020 23:38:43 +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 BEC9C207BB; Sat, 8 Aug 2020 23:38:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596929919; bh=l7DTXjuAfklnRbRkGFN8yM3xQMOqDlSYweAigS6M2Yo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C/0cVK1hRXAFxfkXjHrxlbhww9RqXSc1KAsa6FNpmwMvV3UAJ3CUVOwIDd1v9lVT/ ZhsZ4KAlbqjhkdTCThJThu2Z39qbE7598lPACP7pNzvGZ1dZwmm8EttD/jV8FXdess /HjMUihuMr3qqj3Weiphe1zTh5QYF+qEvQUxjAro= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.7 55/58] nvme-rdma: fix controller reset hang during traffic Date: Sat, 8 Aug 2020 19:37:21 -0400 Message-Id: <20200808233724.3618168-55-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808233724.3618168-1-sashal@kernel.org> References: <20200808233724.3618168-1-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_193841_716292_D25D2A94 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 1f9a45145d0d3..19c94080512cf 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -882,15 +882,20 @@ 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: @@ -923,6 +928,7 @@ 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