From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ursula Braun Subject: [PATCH v2 net 1/2] net/smc: replace function pointer get_netdev() Date: Wed, 11 Oct 2017 13:47:22 +0200 Message-ID: <20171011114723.30733-2-ubraun@linux.vnet.ibm.com> References: <20171011114723.30733-1-ubraun@linux.vnet.ibm.com> Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, jwi@linux.vnet.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, raspl@linux.vnet.ibm.com, ubraun@linux.vnet.ibm.com, parav@mellanox.com To: davem@davemloft.net Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:60354 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751992AbdJKLre (ORCPT ); Wed, 11 Oct 2017 07:47:34 -0400 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v9BBk9Um128942 for ; Wed, 11 Oct 2017 07:47:33 -0400 Received: from e06smtp11.uk.ibm.com (e06smtp11.uk.ibm.com [195.75.94.107]) by mx0a-001b2d01.pphosted.com with ESMTP id 2dhfn8auhw-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 11 Oct 2017 07:47:33 -0400 Received: from localhost by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 11 Oct 2017 12:47:31 +0100 In-Reply-To: <20171011114723.30733-1-ubraun@linux.vnet.ibm.com> Sender: netdev-owner@vger.kernel.org List-ID: SMC should not open code the function pointer get_netdev of the IB device. Replacing ib_query_gid(..., NULL) with ib_query_gid(..., gid_attr) allows access to the netdev. Signed-off-by: Ursula Braun Suggested-by: Parav Pandit Reviewed-by: Parav Pandit --- net/smc/smc_ib.c | 26 +++++++++----------------- 1 file changed, 9 insertions(+), 17 deletions(-) diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index 0b5852299158..468e1d725d97 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -369,26 +369,17 @@ void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport) { - struct net_device *ndev; + struct ib_gid_attr gattr; int rc; rc = ib_query_gid(smcibdev->ibdev, ibport, 0, - &smcibdev->gid[ibport - 1], NULL); - /* the SMC protocol requires specification of the roce MAC address; - * if net_device cannot be determined, it can be derived from gid 0 - */ - ndev = smcibdev->ibdev->get_netdev(smcibdev->ibdev, ibport); - if (ndev) { - memcpy(&smcibdev->mac, ndev->dev_addr, ETH_ALEN); - dev_put(ndev); - } else if (!rc) { - memcpy(&smcibdev->mac[ibport - 1][0], - &smcibdev->gid[ibport - 1].raw[8], 3); - memcpy(&smcibdev->mac[ibport - 1][3], - &smcibdev->gid[ibport - 1].raw[13], 3); - smcibdev->mac[ibport - 1][0] &= ~0x02; - } - return rc; + &smcibdev->gid[ibport - 1], &gattr); + if (rc || !gattr.ndev) + return -ENODEV; + + memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN); + dev_put(gattr.ndev); + return 0; } /* Create an identifier unique for this instance of SMC-R. @@ -419,6 +410,7 @@ int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) &smcibdev->pattr[ibport - 1]); if (rc) goto out; + /* the SMC protocol requires specification of the RoCE MAC address */ rc = smc_ib_fill_gid_and_mac(smcibdev, ibport); if (rc) goto out; -- 2.13.5