From patchwork Wed Nov 2 16:02:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Pirko X-Patchwork-Id: 13028347 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F212CC4332F for ; Wed, 2 Nov 2022 16:03:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231192AbiKBQDH (ORCPT ); Wed, 2 Nov 2022 12:03:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231217AbiKBQCd (ORCPT ); Wed, 2 Nov 2022 12:02:33 -0400 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B24172C677 for ; Wed, 2 Nov 2022 09:02:28 -0700 (PDT) Received: by mail-wr1-x42f.google.com with SMTP id j15so25228823wrq.3 for ; Wed, 02 Nov 2022 09:02:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=resnulli-us.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=7RwLLaFpo0sj1hbyFpn+0hHcMC94yUMEINPITw25T+o=; b=UoVHBQOyYQtVA7OH7/dYOB2nT379v12uPcZd68/xRLyTMNw1NGevPMgayjSPTmCUAM eoRcE46+ry2F4cX6blWBNApacioeWKhDVtAXYcIRndzqpm82PpJ6c3qzz4cZTTEJjwQe flMZBLFW4mOQG8AGfcLBMwoy3d0BstZFr2rZ3tZ2r/CebjSk8iNw65FGGlt0IwgrUnzL tDonjmOKDPdDP6R17Nm1Hijzp+/ja2x5evem0uvwDY5AZT7X81AOS58VT+/BwE/5HW1F OeQf4ZW80AtbrzfqNCbu+QysVhLJFI2/Fv79zkje6uHGhzc9xSNw8mRqDN3RN8Hmkw25 yi0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=7RwLLaFpo0sj1hbyFpn+0hHcMC94yUMEINPITw25T+o=; b=7NvzOpMFf24yloKmOQoD4nvEdSPlB+526JQpDocN836GkqPMjwlV45a+zS06rmTJAY MUBPbBPeh80v23wobcvQN91CRqe139KkIC6bo8UBKCuUfUx6EaFyTSDIyrF5cxl29L2q 7GgIpZSxXhuWfBdDLpehwn01WLbZYTDnH4wEKh/CxNMWLmKCbub71FKJUNBwDgeaJbSh yJcrseemaOxAA1CrEWQgLvcrwsbB9MM+IA5mveHc6z+UMqLKiMQOboZhQRTt8vkVaV50 9kniZESAG+RLfkVOVpQRciT/O0REivvFcKpbN3olawy69qWEvRuJwWTgMYRLykmkiuT8 ldfA== X-Gm-Message-State: ACrzQf34tBkftEBLx+4dOR1Ieo0pP4vV0VtdSbKNr506xzd+7nt/VgE8 +KtN+STeltKCchjKp/XrWKn64A== X-Google-Smtp-Source: AMsMyM7xd568nBJ829N2oPxQX56qen8iq3ilPC01zshTywqctc0w5FIxtpUe994uhYP2T5GyiPt0SQ== X-Received: by 2002:a5d:6711:0:b0:236:721a:7e81 with SMTP id o17-20020a5d6711000000b00236721a7e81mr15774417wru.502.1667404947023; Wed, 02 Nov 2022 09:02:27 -0700 (PDT) Received: from localhost ([86.61.181.4]) by smtp.gmail.com with ESMTPSA id n4-20020adfe344000000b002365f326037sm15905359wrj.63.2022.11.02.09.02.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Nov 2022 09:02:26 -0700 (PDT) From: Jiri Pirko To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, tariqt@nvidia.com, moshe@nvidia.com, saeedm@nvidia.com, linux-rdma@vger.kernel.org Subject: [patch net-next v4 09/13] net: devlink: store copy netdevice ifindex and ifname to allow port_fill() without RTNL held Date: Wed, 2 Nov 2022 17:02:07 +0100 Message-Id: <20221102160211.662752-10-jiri@resnulli.us> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221102160211.662752-1-jiri@resnulli.us> References: <20221102160211.662752-1-jiri@resnulli.us> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Jiri Pirko To avoid a need to take RTNL mutex in port_fill() function, benefit from the introduce infrastructure that tracks netdevice notifier events. Store the ifindex and ifname upon register and change name events. Remove the rtnl_held bool propagated down to port_fill() function as it is no longer needed. Signed-off-by: Jiri Pirko --- include/net/devlink.h | 2 ++ net/core/devlink.c | 68 +++++++++++++++++-------------------------- 2 files changed, 29 insertions(+), 41 deletions(-) diff --git a/include/net/devlink.h b/include/net/devlink.h index b1582b32183a..7befad57afd4 100644 --- a/include/net/devlink.h +++ b/include/net/devlink.h @@ -129,6 +129,8 @@ struct devlink_port { union { struct { struct net_device *netdev; + int ifindex; + char ifname[IFNAMSIZ]; } type_eth; struct { struct ib_device *ibdev; diff --git a/net/core/devlink.c b/net/core/devlink.c index d948bb2fdd5f..38de3a1dff36 100644 --- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -1279,8 +1279,7 @@ devlink_nl_port_function_attrs_put(struct sk_buff *msg, struct devlink_port *por static int devlink_nl_port_fill(struct sk_buff *msg, struct devlink_port *devlink_port, enum devlink_command cmd, u32 portid, u32 seq, - int flags, struct netlink_ext_ack *extack, - bool rtnl_held) + int flags, struct netlink_ext_ack *extack) { struct devlink *devlink = devlink_port->devlink; void *hdr; @@ -1294,9 +1293,6 @@ static int devlink_nl_port_fill(struct sk_buff *msg, if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, devlink_port->index)) goto nla_put_failure; - /* Hold rtnl lock while accessing port's netdev attributes. */ - if (!rtnl_held) - rtnl_lock(); spin_lock_bh(&devlink_port->type_lock); if (nla_put_u16(msg, DEVLINK_ATTR_PORT_TYPE, devlink_port->type)) goto nla_put_failure_type_locked; @@ -1305,13 +1301,11 @@ static int devlink_nl_port_fill(struct sk_buff *msg, devlink_port->desired_type)) goto nla_put_failure_type_locked; if (devlink_port->type == DEVLINK_PORT_TYPE_ETH) { - struct net_device *netdev = devlink_port->type_eth.netdev; - - if (netdev && + if (devlink_port->type_eth.netdev && (nla_put_u32(msg, DEVLINK_ATTR_PORT_NETDEV_IFINDEX, - netdev->ifindex) || + devlink_port->type_eth.ifindex) || nla_put_string(msg, DEVLINK_ATTR_PORT_NETDEV_NAME, - netdev->name))) + devlink_port->type_eth.ifname))) goto nla_put_failure_type_locked; } if (devlink_port->type == DEVLINK_PORT_TYPE_IB) { @@ -1323,8 +1317,6 @@ static int devlink_nl_port_fill(struct sk_buff *msg, goto nla_put_failure_type_locked; } spin_unlock_bh(&devlink_port->type_lock); - if (!rtnl_held) - rtnl_unlock(); if (devlink_nl_port_attrs_put(msg, devlink_port)) goto nla_put_failure; if (devlink_nl_port_function_attrs_put(msg, devlink_port, extack)) @@ -1339,15 +1331,13 @@ static int devlink_nl_port_fill(struct sk_buff *msg, nla_put_failure_type_locked: spin_unlock_bh(&devlink_port->type_lock); - if (!rtnl_held) - rtnl_unlock(); nla_put_failure: genlmsg_cancel(msg, hdr); return -EMSGSIZE; } -static void __devlink_port_notify(struct devlink_port *devlink_port, - enum devlink_command cmd, bool rtnl_held) +static void devlink_port_notify(struct devlink_port *devlink_port, + enum devlink_command cmd) { struct devlink *devlink = devlink_port->devlink; struct sk_buff *msg; @@ -1362,8 +1352,7 @@ static void __devlink_port_notify(struct devlink_port *devlink_port, if (!msg) return; - err = devlink_nl_port_fill(msg, devlink_port, cmd, 0, 0, 0, NULL, - rtnl_held); + err = devlink_nl_port_fill(msg, devlink_port, cmd, 0, 0, 0, NULL); if (err) { nlmsg_free(msg); return; @@ -1373,12 +1362,6 @@ static void __devlink_port_notify(struct devlink_port *devlink_port, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL); } -static void devlink_port_notify(struct devlink_port *devlink_port, - enum devlink_command cmd) -{ - __devlink_port_notify(devlink_port, cmd, false); -} - static void devlink_rate_notify(struct devlink_rate *devlink_rate, enum devlink_command cmd) { @@ -1542,7 +1525,7 @@ static int devlink_nl_cmd_port_get_doit(struct sk_buff *skb, err = devlink_nl_port_fill(msg, devlink_port, DEVLINK_CMD_PORT_NEW, info->snd_portid, info->snd_seq, 0, - info->extack, false); + info->extack); if (err) { nlmsg_free(msg); return err; @@ -1572,8 +1555,7 @@ static int devlink_nl_cmd_port_get_dumpit(struct sk_buff *msg, DEVLINK_CMD_NEW, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, - NLM_F_MULTI, cb->extack, - false); + NLM_F_MULTI, cb->extack); if (err) { devl_unlock(devlink); devlink_put(devlink); @@ -1785,8 +1767,7 @@ static int devlink_port_new_notify(struct devlink *devlink, } err = devlink_nl_port_fill(msg, devlink_port, DEVLINK_CMD_NEW, - info->snd_portid, info->snd_seq, 0, NULL, - false); + info->snd_portid, info->snd_seq, 0, NULL); if (err) goto out; @@ -10062,7 +10043,7 @@ static void devlink_port_type_netdev_checks(struct devlink_port *devlink_port, static void __devlink_port_type_set(struct devlink_port *devlink_port, enum devlink_port_type type, - void *type_dev, bool rtnl_held) + void *type_dev) { struct net_device *netdev = type_dev; @@ -10081,6 +10062,13 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port, switch (type) { case DEVLINK_PORT_TYPE_ETH: devlink_port->type_eth.netdev = netdev; + if (netdev) { + ASSERT_RTNL(); + devlink_port->type_eth.ifindex = netdev->ifindex; + BUILD_BUG_ON(sizeof(devlink_port->type_eth.ifname) != + sizeof(netdev->name)); + strcpy(devlink_port->type_eth.ifname, netdev->name); + } break; case DEVLINK_PORT_TYPE_IB: devlink_port->type_ib.ibdev = type_dev; @@ -10089,7 +10077,7 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port, break; } spin_unlock_bh(&devlink_port->type_lock); - __devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW, rtnl_held); + devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW); } /** @@ -10104,8 +10092,7 @@ void devlink_port_type_eth_set(struct devlink_port *devlink_port) dev_warn(devlink_port->devlink->dev, "devlink port type for port %d set to Ethernet without a software interface reference, device type not supported by the kernel?\n", devlink_port->index); - __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, NULL, - false); + __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, NULL); } EXPORT_SYMBOL_GPL(devlink_port_type_eth_set); @@ -10118,8 +10105,7 @@ EXPORT_SYMBOL_GPL(devlink_port_type_eth_set); void devlink_port_type_ib_set(struct devlink_port *devlink_port, struct ib_device *ibdev) { - __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_IB, ibdev, - false); + __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_IB, ibdev); } EXPORT_SYMBOL_GPL(devlink_port_type_ib_set); @@ -10137,8 +10123,7 @@ void devlink_port_type_clear(struct devlink_port *devlink_port) dev_warn(devlink_port->devlink->dev, "devlink port type for port %d cleared without a software interface reference, device type not supported by the kernel?\n", devlink_port->index); - __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET, NULL, - false); + __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET, NULL); } EXPORT_SYMBOL_GPL(devlink_port_type_clear); @@ -10161,16 +10146,17 @@ static int devlink_netdevice_event(struct notifier_block *nb, * netdevice register */ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, - NULL, true); + NULL); break; case NETDEV_REGISTER: + case NETDEV_CHANGENAME: /* Set the netdev on top of previously set type. Note this * event happens also during net namespace change so here * we take into account netdev pointer appearing in this * namespace. */ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, - netdev, true); + netdev); break; case NETDEV_UNREGISTER: /* Clear netdev pointer, but not the type. This event happens @@ -10178,14 +10164,14 @@ static int devlink_netdevice_event(struct notifier_block *nb, * pointer to netdev that is going to another net namespace. */ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, - NULL, true); + NULL); break; case NETDEV_PRE_UNINIT: /* Clear the type and the netdev pointer. Happens one during * netdevice unregister. */ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET, - NULL, true); + NULL); break; }