From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:49676 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726469AbfKNMDB (ORCPT ); Thu, 14 Nov 2019 07:03:01 -0500 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id xAEBx5Uo005848 for ; Thu, 14 Nov 2019 07:03:00 -0500 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2w94y24djc-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 14 Nov 2019 07:03:00 -0500 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 14 Nov 2019 12:02:57 -0000 From: Karsten Graul Subject: [PATCH net-next 4/8] net/smc: introduce bookkeeping of SMCD link groups Date: Thu, 14 Nov 2019 13:02:43 +0100 In-Reply-To: <20191114120247.68889-1-kgraul@linux.ibm.com> References: <20191114120247.68889-1-kgraul@linux.ibm.com> Message-Id: <20191114120247.68889-5-kgraul@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: davem@davemloft.net Cc: netdev@vger.kernel.org, linux-s390@vger.kernel.org, heiko.carstens@de.ibm.com, raspl@linux.ibm.com, ubraun@linux.ibm.com From: Ursula Braun If the ism module is unloaded return control from exit routine only, if all link groups are freed. If an IB device is thrown away return control from device removal only, if all link groups belonging to this device are freed. A counters for the total number of SMCD link groups per ISM device is introduced. ism module unloading continues only if the total number of SMCD link groups for all ISM devices is zero. ISM device removal continues only it the total number of SMCD link groups per ISM device has decreased to zero. Signed-off-by: Ursula Braun Signed-off-by: Karsten Graul --- include/net/smc.h | 2 ++ net/smc/smc_core.c | 6 ++++++ net/smc/smc_ism.c | 1 + 3 files changed, 9 insertions(+) diff --git a/include/net/smc.h b/include/net/smc.h index 7c2082341bb3..646feb4bc75f 100644 --- a/include/net/smc.h +++ b/include/net/smc.h @@ -79,6 +79,8 @@ struct smcd_dev { bool pnetid_by_user; struct list_head lgr_list; spinlock_t lgr_lock; + atomic_t lgr_cnt; + wait_queue_head_t lgrs_deleted; u8 going_away : 1; }; diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index d79dd78c1cd8..30854acb846c 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -276,6 +276,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) lgr_list = &ini->ism_dev->lgr_list; lgr_lock = &lgr->smcd->lgr_lock; lgr->peer_shutdown = 0; + atomic_inc(&ini->ism_dev->lgr_cnt); } else { /* SMC-R specific settings */ get_device(&ini->ib_dev->ibdev->dev); @@ -486,6 +487,8 @@ static void smc_lgr_free(struct smc_link_group *lgr) smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); put_device(&lgr->smcd->dev); } + if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) + wake_up(&lgr->smcd->lgrs_deleted); } else { smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]); put_device(&lgr->lnk[SMC_SINGLE_LINK].smcibdev->ibdev->dev); @@ -685,6 +688,9 @@ void smc_smcd_terminate_all(struct smcd_dev *smcd) list_del_init(&lgr->list); __smc_lgr_terminate(lgr, false); } + + if (atomic_read(&smcd->lgr_cnt)) + wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); } /* Determine vlan of internal TCP socket. diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c index 56cdab8be1fa..5c4727d5066e 100644 --- a/net/smc/smc_ism.c +++ b/net/smc/smc_ism.c @@ -302,6 +302,7 @@ struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name, spin_lock_init(&smcd->lgr_lock); INIT_LIST_HEAD(&smcd->vlan); INIT_LIST_HEAD(&smcd->lgr_list); + init_waitqueue_head(&smcd->lgrs_deleted); smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)", WQ_MEM_RECLAIM, name); if (!smcd->event_wq) { -- 2.17.1