From patchwork Tue Mar 11 08:45:06 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislav Fomichev X-Patchwork-Id: 14011274 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com [209.85.214.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3DF9522170A; Tue, 11 Mar 2025 08:45:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741682713; cv=none; b=bgk2RNbSp6RPn328h9A8u0cm6lDtyaXHVTSD57x6eDrVlTFFcs61kpIRWfjGhRS9kcGN4DaRXhFLILlPp/QT2jrkQX/Z8HxsKco/R/NkshjKsPtR64oiKUXBobbdjdxX4V96C6SC4LgKe89L1udTxGQjFiPp0zC7BV/exhPUE00= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741682713; c=relaxed/simple; bh=+3CmN/hQnydkKUnM5uIxjVQDt8oxaE5y4SW4pVBWnTw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FuVkE42fe+vIYIsZ60CwFdPXv2dqOwB8368L49wH61h+WA1BOoy2TMp9BkJRv7w0wb4n1KBCzOdTC+a++C6Ln5uLe9Y5FNJIORukkoPQblsOV+0urImDVdFpnbDP19ltwayV8/3+gY7fTpWO9qZplA4tRF7gBEJ7vFzZDEzQTM0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fomichev.me; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.214.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fomichev.me Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pl1-f171.google.com with SMTP id d9443c01a7336-22349bb8605so94706025ad.0; Tue, 11 Mar 2025 01:45:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741682710; x=1742287510; 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=PuAh2RSgJjAezLxauY4sdNf9iEvDGbpYz+rU1XxvKrQ=; b=QEbS1L3s9L226anVtYFctCqcufuipQ8EN6aUIxSGuF1h3rYism1oTXpGDUDx6iNqUF aU4naQYX1i0/RPGk+mQ1ib3PQTM2Bqkt07ju82rMSqLRd27xTxC2zclKhm6tIIpDCjNS /qBP9JFDfUyR03fvyQfpTMU8iSVzSgiChd0DLBfHaWUL9Uu04Ml7XtQSRGCZBmyMZEKG 3AxEkfzvRQYW1DDbmtDBRYrGJEeiUd8MIQk0I5khvEeWo/xdM/82rTLy64SHO4R1RYx0 65Cpr1s9+Hh9gNR9s3N7RnYz+Cu/26JomuQ79dTF2J/XW3dnlG2vWytqQ3Y6WSSZ9Ltx EMIA== X-Forwarded-Encrypted: i=1; AJvYcCWo/TR4ljZpNtphgRRrq1YDZYWz0IsQxrbf+UX4HkTNS09lH98PCitu8w1+aHJuysrwd4Cx6IehHKcZidc=@vger.kernel.org X-Gm-Message-State: AOJu0Yw/dmbeh4BeDPrQSODxIAJPPi2HXcolLa89l4lYQpvOz2sBfbKz x50roC/8sQPXeWdx0xGXMn0mrkqJzIcXE4dGjKNxI941BpFdqKyZzPffSYkdsA== X-Gm-Gg: ASbGncskm3hY5I0SzOLsVIsUat7mJEyzXsPguMFARlv+T2NCJj2KnRy3uiYOKB8zIhC yZfY1Pq28DfOC8tF6GYUEsOHNl2PWh1dU2ZB8KrHA+0yd5CxVehlFxGu9o7PNwd+6LZDJXLNaLG ktpfJoumQaacLENyyjPOqerWaW/Z8PAR3wSK7Y44+rZ3u4fZ4+du0Q5FZadK3OGtfyFCMvsPOwQ 5BfHQjfDe7w4cKU8jxw9SfZHwSStcqJry94Sj8GEvxdGD0ZXfhIBRZj2UEe+j3B5v+/YhjHRh/A dxuFqJD3qYkMHS4UzV/bNJwUWBdi9kwoOIMNBnWmU0WD X-Google-Smtp-Source: AGHT+IEQs6DDe/oWH3AMOWS/T0vwEoYPShu0BVFY2O4Dri6XvVkbj2ncyyh4YUSVv79SHKHc2dGvrQ== X-Received: by 2002:a05:6a20:d491:b0:1f3:418d:91b5 with SMTP id adf61e73a8af0-1f544b2272amr28282918637.24.1741682710203; Tue, 11 Mar 2025 01:45:10 -0700 (PDT) Received: from localhost ([2601:646:9e00:f56e:2844:3d8f:bf3e:12cc]) by smtp.gmail.com with UTF8SMTPSA id 41be03b00d2f7-af52f391035sm2980035a12.77.2025.03.11.01.45.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Mar 2025 01:45:09 -0700 (PDT) From: Stanislav Fomichev To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-kernel@vger.kernel.org, willemdebruijn.kernel@gmail.com, jasowang@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, sdf@fomichev.me, jdamato@fastly.com, kory.maincent@bootlin.com, atenart@kernel.org, kuniyu@amazon.com, Kohei Enju Subject: [PATCH net-next 1/2] Revert "net: replace dev_addr_sem with netdev instance lock" Date: Tue, 11 Mar 2025 01:45:06 -0700 Message-ID: <20250311084507.3978048-2-sdf@fomichev.me> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250311084507.3978048-1-sdf@fomichev.me> References: <20250311084507.3978048-1-sdf@fomichev.me> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org This reverts commit df43d8bf10316a7c3b1e47e3cc0057a54df4a5b8. Cc: Kohei Enju Fixes: df43d8bf1031 ("net: replace dev_addr_sem with netdev instance lock") Signed-off-by: Stanislav Fomichev Reviewed-by: Kuniyuki Iwashima --- drivers/net/tap.c | 2 +- drivers/net/tun.c | 2 +- include/linux/netdevice.h | 6 ++++- net/core/dev.c | 52 +++++++++++++++++++-------------------- net/core/dev.h | 3 ++- net/core/dev_api.c | 17 +++++++++++-- net/core/dev_ioctl.c | 2 +- net/core/net-sysfs.c | 7 ++++-- net/core/rtnetlink.c | 6 +---- 9 files changed, 56 insertions(+), 41 deletions(-) diff --git a/drivers/net/tap.c b/drivers/net/tap.c index 4382f5e323b0..d4ece538f1b2 100644 --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -1017,7 +1017,7 @@ static long tap_ioctl(struct file *file, unsigned int cmd, rtnl_unlock(); return -ENOLINK; } - ret = dev_set_mac_address(tap->dev, &sa, NULL); + ret = dev_set_mac_address_user(tap->dev, &sa, NULL); tap_put_tap_dev(tap); rtnl_unlock(); return ret; diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 55b60cb68d00..f75f912a0225 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -3193,7 +3193,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, case SIOCSIFHWADDR: /* Set hw address */ - ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr, NULL); + ret = dev_set_mac_address_user(tun->dev, &ifr.ifr_hwaddr, NULL); break; case TUNGETSNDBUF: diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 9a297757df7e..42c75cb028e7 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2498,7 +2498,7 @@ struct net_device { * * Protects: * @gro_flush_timeout, @napi_defer_hard_irqs, @napi_list, - * @net_shaper_hierarchy, @reg_state, @threaded, @dev_addr + * @net_shaper_hierarchy, @reg_state, @threaded * * Partially protects (writers must hold both @lock and rtnl_lock): * @up @@ -4198,6 +4198,10 @@ int netif_set_mac_address(struct net_device *dev, struct sockaddr *sa, struct netlink_ext_ack *extack); int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, struct netlink_ext_ack *extack); +int netif_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, + struct netlink_ext_ack *extack); +int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, + struct netlink_ext_ack *extack); int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name); int dev_get_port_parent_id(struct net_device *dev, struct netdev_phys_item_id *ppid, bool recurse); diff --git a/net/core/dev.c b/net/core/dev.c index 1cb134ff7327..5a64389461e2 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1059,28 +1059,6 @@ struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex) return __netdev_put_lock(dev); } -/** - * netdev_get_by_name_lock() - find a device by its name - * @net: the applicable net namespace - * @name: name of device - * - * Search for an interface by name. If a valid device - * with @name is found it will be returned with netdev->lock held. - * netdev_unlock() must be called to release it. - * - * Return: pointer to a device with lock held, NULL if not found. - */ -struct net_device *netdev_get_by_name_lock(struct net *net, const char *name) -{ - struct net_device *dev; - - dev = dev_get_by_name(net, name); - if (!dev) - return NULL; - - return __netdev_put_lock(dev); -} - struct net_device * netdev_xa_find_lock(struct net *net, struct net_device *dev, unsigned long *index) @@ -9612,24 +9590,44 @@ int netif_set_mac_address(struct net_device *dev, struct sockaddr *sa, return 0; } +DECLARE_RWSEM(dev_addr_sem); + +int netif_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, + struct netlink_ext_ack *extack) +{ + int ret; + + down_write(&dev_addr_sem); + ret = netif_set_mac_address(dev, sa, extack); + up_write(&dev_addr_sem); + return ret; +} + int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name) { size_t size = sizeof(sa->sa_data_min); struct net_device *dev; + int ret = 0; - dev = netdev_get_by_name_lock(net, dev_name); - if (!dev) - return -ENODEV; + down_read(&dev_addr_sem); + rcu_read_lock(); + dev = dev_get_by_name_rcu(net, dev_name); + if (!dev) { + ret = -ENODEV; + goto unlock; + } if (!dev->addr_len) memset(sa->sa_data, 0, size); else memcpy(sa->sa_data, dev->dev_addr, min_t(size_t, size, dev->addr_len)); sa->sa_family = dev->type; - netdev_unlock(dev); - return 0; +unlock: + rcu_read_unlock(); + up_read(&dev_addr_sem); + return ret; } EXPORT_SYMBOL(dev_get_mac_address); diff --git a/net/core/dev.h b/net/core/dev.h index 0ddd3631acb0..7ee203395d8e 100644 --- a/net/core/dev.h +++ b/net/core/dev.h @@ -29,7 +29,6 @@ netdev_napi_by_id_lock(struct net *net, unsigned int napi_id); struct net_device *dev_get_by_napi_id(unsigned int napi_id); struct net_device *netdev_get_by_index_lock(struct net *net, int ifindex); -struct net_device *netdev_get_by_name_lock(struct net *net, const char *name); struct net_device *__netdev_put_lock(struct net_device *dev); struct net_device * netdev_xa_find_lock(struct net *net, struct net_device *dev, @@ -71,6 +70,8 @@ extern int weight_p; extern int dev_weight_rx_bias; extern int dev_weight_tx_bias; +extern struct rw_semaphore dev_addr_sem; + /* rtnl helpers */ extern struct list_head net_todo_list; void netdev_run_todo(void); diff --git a/net/core/dev_api.c b/net/core/dev_api.c index 1f0e24849bc6..2e17548af685 100644 --- a/net/core/dev_api.c +++ b/net/core/dev_api.c @@ -84,6 +84,19 @@ void dev_set_group(struct net_device *dev, int new_group) netdev_unlock_ops(dev); } +int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, + struct netlink_ext_ack *extack) +{ + int ret; + + netdev_lock_ops(dev); + ret = netif_set_mac_address_user(dev, sa, extack); + netdev_unlock_ops(dev); + + return ret; +} +EXPORT_SYMBOL(dev_set_mac_address_user); + /** * dev_change_net_namespace() - move device to different nethost namespace * @dev: device @@ -299,9 +312,9 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, { int ret; - netdev_lock(dev); + netdev_lock_ops(dev); ret = netif_set_mac_address(dev, sa, extack); - netdev_unlock(dev); + netdev_unlock_ops(dev); return ret; } diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c index 5471cf4fc984..eb8b41ec5523 100644 --- a/net/core/dev_ioctl.c +++ b/net/core/dev_ioctl.c @@ -575,7 +575,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, case SIOCSIFHWADDR: if (dev->addr_len > sizeof(struct sockaddr)) return -EINVAL; - return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL); + return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL); case SIOCSIFHWBROADCAST: if (ifr->ifr_hwaddr.sa_family != dev->type) diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 529a0f721268..abaa1c919b98 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -263,11 +263,14 @@ static ssize_t address_show(struct device *dev, struct device_attribute *attr, struct net_device *ndev = to_net_dev(dev); ssize_t ret = -EINVAL; - netdev_lock(ndev); + down_read(&dev_addr_sem); + + rcu_read_lock(); if (dev_isalive(ndev)) ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); - netdev_unlock(ndev); + rcu_read_unlock(); + up_read(&dev_addr_sem); return ret; } static DEVICE_ATTR_RO(address); diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 90597bf84e3d..9355058bf996 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3090,11 +3090,7 @@ static int do_setlink(const struct sk_buff *skb, struct net_device *dev, sa->sa_family = dev->type; memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), dev->addr_len); - if (!netdev_need_ops_lock(dev)) - netdev_lock(dev); - err = netif_set_mac_address(dev, sa, extack); - if (!netdev_need_ops_lock(dev)) - netdev_unlock(dev); + err = netif_set_mac_address_user(dev, sa, extack); kfree(sa); if (err) goto errout;