From owner-svn-src-stable@freebsd.org Wed Dec 12 11:01:24 2018 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 7C63A13380E2; Wed, 12 Dec 2018 11:01:24 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 22AAE87E3A; Wed, 12 Dec 2018 11:01:24 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 18FBF6F78; Wed, 12 Dec 2018 11:01:24 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wBCB1NQe032516; Wed, 12 Dec 2018 11:01:23 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wBCB1NP0032515; Wed, 12 Dec 2018 11:01:23 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201812121101.wBCB1NP0032515@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Wed, 12 Dec 2018 11:01:23 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r341878 - stable/11/sys/ofed/drivers/infiniband/core X-SVN-Group: stable-11 X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: stable/11/sys/ofed/drivers/infiniband/core X-SVN-Commit-Revision: 341878 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 22AAE87E3A X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-0.71 / 15.00]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_SHORT(-0.71)[-0.709,0] X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Dec 2018 11:01:24 -0000 Author: hselasky Date: Wed Dec 12 11:01:23 2018 New Revision: 341878 URL: https://svnweb.freebsd.org/changeset/base/341878 Log: MFC r341532: ibcore: Fix sleeping in atomic when RoCE is used A couple of places in the CM do spin_lock_irq(&cm_id_priv->lock); ... if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) However when the underlying transport is RoCE, this leads to a sleeping function being called with the lock held - the callchain is cm_alloc_response_msg() -> ib_create_ah_from_wc() -> ib_init_ah_from_wc() -> rdma_addr_find_l2_eth_by_grh() -> rdma_resolve_ip() and rdma_resolve_ip() starts out by doing req = kzalloc(sizeof *req, GFP_KERNEL); not to mention rdma_addr_find_l2_eth_by_grh() doing wait_for_completion(&ctx.comp); to wait for the task that rdma_resolve_ip() queues up. Fix this by moving the AH creation out of the lock. Linux commit: c76161181193985087cd716fdf69b5cb6cf9ee85 Sponsored by: Mellanox Technologies Modified: stable/11/sys/ofed/drivers/infiniband/core/ib_cm.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/ofed/drivers/infiniband/core/ib_cm.c ============================================================================== --- stable/11/sys/ofed/drivers/infiniband/core/ib_cm.c Wed Dec 12 11:00:36 2018 (r341877) +++ stable/11/sys/ofed/drivers/infiniband/core/ib_cm.c Wed Dec 12 11:01:23 2018 (r341878) @@ -332,11 +332,19 @@ out: return ret; } -static int cm_alloc_response_msg(struct cm_port *port, - struct ib_mad_recv_wc *mad_recv_wc, - struct ib_mad_send_buf **msg) +static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc) { - struct ib_mad_send_buf *m; + return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, + 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, + GFP_ATOMIC, + IB_MGMT_BASE_VERSION); +} + +static int cm_create_response_msg_ah(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc, + struct ib_mad_send_buf *msg) +{ struct ib_ah *ah; ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, @@ -344,27 +352,40 @@ static int cm_alloc_response_msg(struct cm_port *port, if (IS_ERR(ah)) return PTR_ERR(ah); - m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, - 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, - GFP_ATOMIC, - IB_MGMT_BASE_VERSION); - if (IS_ERR(m)) { - ib_destroy_ah(ah); - return PTR_ERR(m); - } - m->ah = ah; - *msg = m; + msg->ah = ah; return 0; } static void cm_free_msg(struct ib_mad_send_buf *msg) { - ib_destroy_ah(msg->ah); + if (msg->ah) + ib_destroy_ah(msg->ah); if (msg->context[0]) cm_deref_id(msg->context[0]); ib_free_send_mad(msg); } +static int cm_alloc_response_msg(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc, + struct ib_mad_send_buf **msg) +{ + struct ib_mad_send_buf *m; + int ret; + + m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); + if (IS_ERR(m)) + return PTR_ERR(m); + + ret = cm_create_response_msg_ah(port, mad_recv_wc, m); + if (ret) { + cm_free_msg(m); + return ret; + } + + *msg = m; + return 0; +} + static void * cm_copy_private_data(const void *private_data, u8 private_data_len) { @@ -2331,7 +2352,8 @@ static int cm_dreq_handler(struct cm_work *work) case IB_CM_TIMEWAIT: atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. counter[CM_DREQ_COUNTER]); - if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) + msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); + if (IS_ERR(msg)) goto unlock; cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, @@ -2339,7 +2361,8 @@ static int cm_dreq_handler(struct cm_work *work) cm_id_priv->private_data_len); spin_unlock_irq(&cm_id_priv->lock); - if (ib_post_send_mad(msg, NULL)) + if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || + ib_post_send_mad(msg, NULL)) cm_free_msg(msg); goto deref; case IB_CM_DREQ_RCVD: @@ -2884,7 +2907,8 @@ static int cm_lap_handler(struct cm_work *work) case IB_CM_MRA_LAP_SENT: atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. counter[CM_LAP_COUNTER]); - if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) + msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); + if (IS_ERR(msg)) goto unlock; cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, @@ -2894,7 +2918,8 @@ static int cm_lap_handler(struct cm_work *work) cm_id_priv->private_data_len); spin_unlock_irq(&cm_id_priv->lock); - if (ib_post_send_mad(msg, NULL)) + if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || + ib_post_send_mad(msg, NULL)) cm_free_msg(msg); goto deref; case IB_CM_LAP_RCVD: