From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:24616 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2404089AbgKXRvO (ORCPT ); Tue, 24 Nov 2020 12:51:14 -0500 From: Karsten Graul Subject: [PATCH net-next v5 06/14] net/smc: Add diagnostic information to link structure Date: Tue, 24 Nov 2020 18:50:39 +0100 Message-Id: <20201124175047.56949-7-kgraul@linux.ibm.com> In-Reply-To: <20201124175047.56949-1-kgraul@linux.ibm.com> References: <20201124175047.56949-1-kgraul@linux.ibm.com> List-ID: To: David Miller , Jakub Kicinski Cc: Heiko Carstens , Stefan Raspl , netdev@vger.kernel.org, linux-s390@vger.kernel.org From: Guvenc Gulce During link creation add net-device ifindex and ib-device name to link structure. This is needed for diagnostic purposes. When diagnostic information is gathered, we need to traverse device, linkgroup and link structures, to be able to do that we need to hold a spinlock for the linkgroup list, without this diagnostic information in link structure, another device list mutex holding would be necessary to dereference the device pointer in the link structure which would be impossible when holding a spinlock already. Signed-off-by: Guvenc Gulce Signed-off-by: Karsten Graul --- net/smc/smc_core.c | 10 ++++++++++ net/smc/smc_core.h | 2 ++ 2 files changed, 12 insertions(+) diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index 46087cec3bcd..0088511e30bf 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -313,6 +313,15 @@ static u8 smcr_next_link_id(struct smc_link_group *lgr) return link_id; } +static void smcr_copy_dev_info_to_link(struct smc_link *link) +{ + struct smc_ib_device *smcibdev = link->smcibdev; + + snprintf(link->ibname, sizeof(link->ibname), "%s", + smcibdev->ibdev->name); + link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; +} + int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, u8 link_idx, struct smc_init_info *ini) { @@ -327,6 +336,7 @@ int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, lnk->smcibdev = ini->ib_dev; lnk->ibport = ini->ib_port; smc_ibdev_cnt_inc(lnk); + smcr_copy_dev_info_to_link(lnk); lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu; atomic_set(&lnk->conn_cnt, 0); smc_llc_link_set_uid(lnk); diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h index eefb6770b268..3a1bb8e4b81f 100644 --- a/net/smc/smc_core.h +++ b/net/smc/smc_core.h @@ -124,6 +124,8 @@ struct smc_link { u8 link_is_asym; /* is link asymmetric? */ struct smc_link_group *lgr; /* parent link group */ struct work_struct link_down_wrk; /* wrk to bring link down */ + char ibname[IB_DEVICE_NAME_MAX]; /* ib device name */ + int ndev_ifidx; /* network device ifindex */ enum smc_link_state state; /* state of link */ struct delayed_work llc_testlink_wrk; /* testlink worker */ -- 2.17.1