From patchwork Wed Apr 10 09:34:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 10893535 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 068B717E6 for ; Wed, 10 Apr 2019 09:34:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EB6192018F for ; Wed, 10 Apr 2019 09:34:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DF8582845E; Wed, 10 Apr 2019 09:34:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 81A042018F for ; Wed, 10 Apr 2019 09:34:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729626AbfDJJer (ORCPT ); Wed, 10 Apr 2019 05:34:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:48466 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727226AbfDJJer (ORCPT ); Wed, 10 Apr 2019 05:34:47 -0400 Received: from localhost (unknown [77.138.135.184]) (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 4B96F2083E; Wed, 10 Apr 2019 09:34:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554888886; bh=7scCKLkMMcbZ0iaHRJ95l0QHXwxqjWjZuugPU6ChUmI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S5sZ+lpniDJChKlxIA6p2uRxPYBL3hjjZga7nPnr4UuNYq+2YUX1EePRzY/7WNzBs w+JzceXXp4iLaEoRTI21OFvZ2tn2WVDsooxGBWiRL6mkxPglzGFaW07s9zv5XgHn5l z5NoNDdIABi1X5ZzH5qzSSAlT/M6qB0pl9bULud8= From: Leon Romanovsky To: Doug Ledford , Jason Gunthorpe Cc: Leon Romanovsky , RDMA mailing list , Huy Nguyen , Martin Wilck , Parav Pandit Subject: [PATCH rdma-next v1 4/7] RDMA/cma: Use rdma_read_gid_attr_ndev_rcu to access netdev Date: Wed, 10 Apr 2019 12:34:27 +0300 Message-Id: <20190410093430.31478-5-leon@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190410093430.31478-1-leon@kernel.org> References: <20190410093430.31478-1-leon@kernel.org> MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Parav Pandit To access the netdevice of the GID attribute, use an existing API rdma_read_gid_attr_ndev_rcu(). This further reduces dependency on open access to netdevice of GID attribute. Signed-off-by: Parav Pandit Signed-off-by: Leon Romanovsky --- drivers/infiniband/core/addr.c | 1 + drivers/infiniband/core/cache.c | 1 + drivers/infiniband/core/cma.c | 12 ++++++++++-- include/rdma/ib_cache.h | 1 + 4 files changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c index 0dce94e3c495..2b791ce7597f 100644 --- a/drivers/infiniband/core/addr.c +++ b/drivers/infiniband/core/addr.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include #include diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 73a6480e23b6..d1626502a0d5 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -1268,6 +1268,7 @@ struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr) read_unlock_irqrestore(&table->rwlock, flags); return ndev; } +EXPORT_SYMBOL(rdma_read_gid_attr_ndev_rcu); static int get_lower_dev_vlan(struct net_device *lower_dev, void *data) { diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 7e139b3839dc..efa091cad141 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -1473,6 +1473,7 @@ static struct net_device * roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event) { const struct ib_gid_attr *sgid_attr = NULL; + struct net_device *ndev; if (ib_event->event == IB_CM_REQ_RECEIVED) sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr; @@ -1481,8 +1482,15 @@ roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event) if (!sgid_attr) return NULL; - dev_hold(sgid_attr->ndev); - return sgid_attr->ndev; + + rcu_read_lock(); + ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr); + if (IS_ERR(ndev)) + ndev = NULL; + else + dev_hold(ndev); + rcu_read_unlock(); + return ndev; } static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event, diff --git a/include/rdma/ib_cache.h b/include/rdma/ib_cache.h index 730a65ad8c74..870b5e6c06db 100644 --- a/include/rdma/ib_cache.h +++ b/include/rdma/ib_cache.h @@ -56,6 +56,7 @@ const struct ib_gid_attr *rdma_find_gid_by_filter( int rdma_read_gid_l2_fields(const struct ib_gid_attr *attr, u16 *vlan_id, u8 *smac); +struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr); /** * ib_get_cached_pkey - Returns a cached PKey table entry