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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 2006AC34047 for ; Tue, 18 Feb 2020 20:04:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAE9721D56 for ; Tue, 18 Feb 2020 20:04:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582056298; bh=iJHNKSYGnxMSCtFIX5d8ZQWPZczsyXHD2fcIXpGlXXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lYbm6Dcbl3okSLJxrAsIOL5KwerflGedbcndoE4It3HHmbuoRuUvBbewWa2Sandaf L6lH3qDnWsFw9/KyEFIFFXrlTEBBkMCZbf1qfRWOWenMX02PWNqO8ADcJ0iJo1vAK6 g/OZ0XmdWV4bkLvlEh22d+KZQEQUoO8iOQb/mK9g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728749AbgBRUCc (ORCPT ); Tue, 18 Feb 2020 15:02:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:42940 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728954AbgBRUCb (ORCPT ); Tue, 18 Feb 2020 15:02:31 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C402A21D56; Tue, 18 Feb 2020 20:02:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582056151; bh=iJHNKSYGnxMSCtFIX5d8ZQWPZczsyXHD2fcIXpGlXXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ULBXP6/iygu48UaJES3jybOAR5+Bzo8PIq67PqkiqSAFlJMEieTDVl8fpHCzvMEV9 wqfbqUnQjn7B3pDUybI3tk/ZLqN2fQuIr8l74WgNZkKWgyI13UyFmKynTfmZBZ5L5Y GkfH/ESpN3vebXpaQgD3V5HZcXdqDrnLQmG2UYzI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Krishnamraju Eraparaju , Jason Gunthorpe Subject: [PATCH 5.5 54/80] RDMA/iw_cxgb4: initiate CLOSE when entering TERM Date: Tue, 18 Feb 2020 20:55:15 +0100 Message-Id: <20200218190437.331531433@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200218190432.043414522@linuxfoundation.org> References: <20200218190432.043414522@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Krishnamraju Eraparaju commit d219face9059f38ad187bde133451a2a308fdb7c upstream. As per draft-hilland-iwarp-verbs-v1.0, sec 6.2.3, always initiate a CLOSE when entering into TERM state. In c4iw_modify_qp(), disconnect operation should only be performed when the modify_qp call is invoked from ib_core. And all other internal modify_qp calls(invoked within iw_cxgb4) that needs 'disconnect' should call c4iw_ep_disconnect() explicitly after modify_qp. Otherwise, deadlocks like below can occur: Call Trace: schedule+0x2f/0xa0 schedule_preempt_disabled+0xa/0x10 __mutex_lock.isra.5+0x2d0/0x4a0 c4iw_ep_disconnect+0x39/0x430 => tries to reacquire ep lock again c4iw_modify_qp+0x468/0x10d0 rx_data+0x218/0x570 => acquires ep lock process_work+0x5f/0x70 process_one_work+0x1a7/0x3b0 worker_thread+0x30/0x390 kthread+0x112/0x130 ret_from_fork+0x35/0x40 Fixes: d2c33370ae73 ("RDMA/iw_cxgb4: Always disconnect when QP is transitioning to TERMINATE state") Link: https://lore.kernel.org/r/20200204091230.7210-1-krishna2@chelsio.com Signed-off-by: Krishnamraju Eraparaju Signed-off-by: Jason Gunthorpe Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/hw/cxgb4/cm.c | 4 ++++ drivers/infiniband/hw/cxgb4/qp.c | 4 ++-- 2 files changed, 6 insertions(+), 2 deletions(-) --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -3036,6 +3036,10 @@ static int terminate(struct c4iw_dev *de C4IW_QP_ATTR_NEXT_STATE, &attrs, 1); } + /* As per draft-hilland-iwarp-verbs-v1.0, sec 6.2.3, + * when entering the TERM state the RNIC MUST initiate a CLOSE. + */ + c4iw_ep_disconnect(ep, 1, GFP_KERNEL); c4iw_put_ep(&ep->com); } else pr_warn("TERM received tid %u no ep/qp\n", tid); --- a/drivers/infiniband/hw/cxgb4/qp.c +++ b/drivers/infiniband/hw/cxgb4/qp.c @@ -1948,10 +1948,10 @@ int c4iw_modify_qp(struct c4iw_dev *rhp, qhp->attr.layer_etype = attrs->layer_etype; qhp->attr.ecode = attrs->ecode; ep = qhp->ep; - c4iw_get_ep(&ep->com); - disconnect = 1; if (!internal) { + c4iw_get_ep(&ep->com); terminate = 1; + disconnect = 1; } else { terminate = qhp->attr.send_term; ret = rdma_fini(rhp, qhp, ep);