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![Eric Dumazet](/assets/img/avatar_default.png)
dev_isalive() is called under RTNL or dev_base_lock protection.
This means that changes to dev->reg_state should be done with both locks held.
syzbot reported:
BUG: KCSAN: data-race in register_netdevice / type_show
write to 0xffff888144ecf518 of 1 bytes by task 20886 on cpu 0:
register_netdevice+0xb9f/0xdf0 net/core/dev.c:10050
lapbeth_new_device drivers/net/wan/lapbether.c:414 [inline]
lapbeth_device_event+0x4a0/0x6c0 drivers/net/wan/lapbether.c:456
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0x53/0xb0 kernel/notifier.c:455
__dev_notify_flags+0x1d6/0x3a0
dev_change_flags+0xa2/0xc0 net/core/dev.c:8607
do_setlink+0x778/0x2230 net/core/rtnetlink.c:2780
__rtnl_newlink net/core/rtnetlink.c:3546 [inline]
rtnl_newlink+0x114c/0x16a0 net/core/rtnetlink.c:3593
rtnetlink_rcv_msg+0x811/0x8c0 net/core/rtnetlink.c:6089
netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2501
rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6107
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x661/0x750 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg net/socket.c:734 [inline]
__sys_sendto+0x21e/0x2c0 net/socket.c:2119
__do_sys_sendto net/socket.c:2131 [inline]
__se_sys_sendto net/socket.c:2127 [inline]
__x64_sys_sendto+0x74/0x90 net/socket.c:2127
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
read to 0xffff888144ecf518 of 1 bytes by task 20423 on cpu 1:
dev_isalive net/core/net-sysfs.c:38 [inline]
netdev_show net/core/net-sysfs.c:50 [inline]
type_show+0x24/0x90 net/core/net-sysfs.c:112
dev_attr_show+0x35/0x90 drivers/base/core.c:2095
sysfs_kf_seq_show+0x175/0x240 fs/sysfs/file.c:59
kernfs_seq_show+0x75/0x80 fs/kernfs/file.c:162
seq_read_iter+0x2c3/0x8e0 fs/seq_file.c:230
kernfs_fop_read_iter+0xd1/0x2f0 fs/kernfs/file.c:235
call_read_iter include/linux/fs.h:2052 [inline]
new_sync_read fs/read_write.c:401 [inline]
vfs_read+0x5a5/0x6a0 fs/read_write.c:482
ksys_read+0xe8/0x1a0 fs/read_write.c:620
__do_sys_read fs/read_write.c:630 [inline]
__se_sys_read fs/read_write.c:628 [inline]
__x64_sys_read+0x3e/0x50 fs/read_write.c:628
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
value changed: 0x00 -> 0x01
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20423 Comm: udevd Tainted: G W 5.19.0-rc2-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Fixes: 1da177e4c3
("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2079 lines
49 KiB
C
2079 lines
49 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net-sysfs.c - network device class and attributes
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*
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* Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
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*/
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#include <linux/capability.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/isolation.h>
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#include <linux/nsproxy.h>
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#include <net/sock.h>
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#include <net/net_namespace.h>
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#include <linux/rtnetlink.h>
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#include <linux/vmalloc.h>
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#include <linux/export.h>
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#include <linux/jiffies.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include <linux/of_net.h>
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#include <linux/cpu.h>
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#include "dev.h"
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#include "net-sysfs.h"
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#ifdef CONFIG_SYSFS
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static const char fmt_hex[] = "%#x\n";
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static const char fmt_dec[] = "%d\n";
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static const char fmt_ulong[] = "%lu\n";
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static const char fmt_u64[] = "%llu\n";
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/* Caller holds RTNL or dev_base_lock */
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static inline int dev_isalive(const struct net_device *dev)
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{
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return dev->reg_state <= NETREG_REGISTERED;
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}
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/* use same locking rules as GIF* ioctl's */
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static ssize_t netdev_show(const struct device *dev,
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struct device_attribute *attr, char *buf,
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ssize_t (*format)(const struct net_device *, char *))
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{
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struct net_device *ndev = to_net_dev(dev);
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ssize_t ret = -EINVAL;
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read_lock(&dev_base_lock);
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if (dev_isalive(ndev))
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ret = (*format)(ndev, buf);
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read_unlock(&dev_base_lock);
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return ret;
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}
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/* generate a show function for simple field */
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#define NETDEVICE_SHOW(field, format_string) \
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static ssize_t format_##field(const struct net_device *dev, char *buf) \
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{ \
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return sprintf(buf, format_string, dev->field); \
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} \
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static ssize_t field##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return netdev_show(dev, attr, buf, format_##field); \
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} \
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#define NETDEVICE_SHOW_RO(field, format_string) \
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NETDEVICE_SHOW(field, format_string); \
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static DEVICE_ATTR_RO(field)
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#define NETDEVICE_SHOW_RW(field, format_string) \
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NETDEVICE_SHOW(field, format_string); \
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static DEVICE_ATTR_RW(field)
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/* use same locking and permission rules as SIF* ioctl's */
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static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len,
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int (*set)(struct net_device *, unsigned long))
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{
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struct net_device *netdev = to_net_dev(dev);
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struct net *net = dev_net(netdev);
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unsigned long new;
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int ret;
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if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
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return -EPERM;
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ret = kstrtoul(buf, 0, &new);
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if (ret)
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goto err;
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if (!rtnl_trylock())
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return restart_syscall();
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if (dev_isalive(netdev)) {
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ret = (*set)(netdev, new);
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if (ret == 0)
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ret = len;
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}
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rtnl_unlock();
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err:
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return ret;
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}
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NETDEVICE_SHOW_RO(dev_id, fmt_hex);
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NETDEVICE_SHOW_RO(dev_port, fmt_dec);
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NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
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NETDEVICE_SHOW_RO(addr_len, fmt_dec);
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NETDEVICE_SHOW_RO(ifindex, fmt_dec);
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NETDEVICE_SHOW_RO(type, fmt_dec);
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NETDEVICE_SHOW_RO(link_mode, fmt_dec);
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static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct net_device *ndev = to_net_dev(dev);
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return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
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}
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static DEVICE_ATTR_RO(iflink);
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static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
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{
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return sprintf(buf, fmt_dec, dev->name_assign_type);
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}
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static ssize_t name_assign_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct net_device *ndev = to_net_dev(dev);
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ssize_t ret = -EINVAL;
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if (ndev->name_assign_type != NET_NAME_UNKNOWN)
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ret = netdev_show(dev, attr, buf, format_name_assign_type);
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return ret;
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}
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static DEVICE_ATTR_RO(name_assign_type);
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/* use same locking rules as GIFHWADDR ioctl's */
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static ssize_t address_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct net_device *ndev = to_net_dev(dev);
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ssize_t ret = -EINVAL;
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read_lock(&dev_base_lock);
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if (dev_isalive(ndev))
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ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
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read_unlock(&dev_base_lock);
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return ret;
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}
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static DEVICE_ATTR_RO(address);
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static ssize_t broadcast_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *ndev = to_net_dev(dev);
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if (dev_isalive(ndev))
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return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
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return -EINVAL;
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}
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static DEVICE_ATTR_RO(broadcast);
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static int change_carrier(struct net_device *dev, unsigned long new_carrier)
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{
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if (!netif_running(dev))
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return -EINVAL;
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return dev_change_carrier(dev, (bool)new_carrier);
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}
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static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct net_device *netdev = to_net_dev(dev);
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/* The check is also done in change_carrier; this helps returning early
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* without hitting the trylock/restart in netdev_store.
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*/
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if (!netdev->netdev_ops->ndo_change_carrier)
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return -EOPNOTSUPP;
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return netdev_store(dev, attr, buf, len, change_carrier);
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}
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static ssize_t carrier_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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if (netif_running(netdev))
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return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
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return -EINVAL;
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}
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static DEVICE_ATTR_RW(carrier);
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static ssize_t speed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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int ret = -EINVAL;
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/* The check is also done in __ethtool_get_link_ksettings; this helps
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* returning early without hitting the trylock/restart below.
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*/
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if (!netdev->ethtool_ops->get_link_ksettings)
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return ret;
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if (!rtnl_trylock())
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return restart_syscall();
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if (netif_running(netdev) && netif_device_present(netdev)) {
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struct ethtool_link_ksettings cmd;
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if (!__ethtool_get_link_ksettings(netdev, &cmd))
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ret = sprintf(buf, fmt_dec, cmd.base.speed);
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}
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rtnl_unlock();
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return ret;
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}
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static DEVICE_ATTR_RO(speed);
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static ssize_t duplex_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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int ret = -EINVAL;
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/* The check is also done in __ethtool_get_link_ksettings; this helps
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* returning early without hitting the trylock/restart below.
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*/
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if (!netdev->ethtool_ops->get_link_ksettings)
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return ret;
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if (!rtnl_trylock())
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return restart_syscall();
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if (netif_running(netdev)) {
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struct ethtool_link_ksettings cmd;
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if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
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const char *duplex;
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switch (cmd.base.duplex) {
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case DUPLEX_HALF:
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duplex = "half";
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break;
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case DUPLEX_FULL:
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duplex = "full";
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break;
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default:
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duplex = "unknown";
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break;
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}
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ret = sprintf(buf, "%s\n", duplex);
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}
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}
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rtnl_unlock();
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return ret;
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}
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static DEVICE_ATTR_RO(duplex);
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static ssize_t testing_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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if (netif_running(netdev))
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return sprintf(buf, fmt_dec, !!netif_testing(netdev));
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return -EINVAL;
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}
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static DEVICE_ATTR_RO(testing);
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static ssize_t dormant_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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if (netif_running(netdev))
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return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
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return -EINVAL;
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}
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static DEVICE_ATTR_RO(dormant);
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static const char *const operstates[] = {
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"unknown",
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"notpresent", /* currently unused */
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"down",
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"lowerlayerdown",
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"testing",
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"dormant",
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"up"
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};
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static ssize_t operstate_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const struct net_device *netdev = to_net_dev(dev);
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unsigned char operstate;
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read_lock(&dev_base_lock);
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operstate = netdev->operstate;
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if (!netif_running(netdev))
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operstate = IF_OPER_DOWN;
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read_unlock(&dev_base_lock);
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if (operstate >= ARRAY_SIZE(operstates))
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return -EINVAL; /* should not happen */
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return sprintf(buf, "%s\n", operstates[operstate]);
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}
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static DEVICE_ATTR_RO(operstate);
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static ssize_t carrier_changes_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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return sprintf(buf, fmt_dec,
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atomic_read(&netdev->carrier_up_count) +
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atomic_read(&netdev->carrier_down_count));
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}
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static DEVICE_ATTR_RO(carrier_changes);
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static ssize_t carrier_up_count_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
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}
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static DEVICE_ATTR_RO(carrier_up_count);
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static ssize_t carrier_down_count_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
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}
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static DEVICE_ATTR_RO(carrier_down_count);
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/* read-write attributes */
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static int change_mtu(struct net_device *dev, unsigned long new_mtu)
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{
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return dev_set_mtu(dev, (int)new_mtu);
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}
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static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return netdev_store(dev, attr, buf, len, change_mtu);
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}
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NETDEVICE_SHOW_RW(mtu, fmt_dec);
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static int change_flags(struct net_device *dev, unsigned long new_flags)
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{
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return dev_change_flags(dev, (unsigned int)new_flags, NULL);
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}
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static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return netdev_store(dev, attr, buf, len, change_flags);
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}
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NETDEVICE_SHOW_RW(flags, fmt_hex);
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static ssize_t tx_queue_len_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
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}
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NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
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static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
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{
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WRITE_ONCE(dev->gro_flush_timeout, val);
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return 0;
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}
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static ssize_t gro_flush_timeout_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
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}
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NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
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static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
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{
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WRITE_ONCE(dev->napi_defer_hard_irqs, val);
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return 0;
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}
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static ssize_t napi_defer_hard_irqs_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
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}
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NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
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|
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static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
|
|
struct net_device *netdev = to_net_dev(dev);
|
|
struct net *net = dev_net(netdev);
|
|
size_t count = len;
|
|
ssize_t ret = 0;
|
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* ignore trailing newline */
|
|
if (len > 0 && buf[len - 1] == '\n')
|
|
--count;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
if (dev_isalive(netdev)) {
|
|
ret = dev_set_alias(netdev, buf, count);
|
|
if (ret < 0)
|
|
goto err;
|
|
ret = len;
|
|
netdev_state_change(netdev);
|
|
}
|
|
err:
|
|
rtnl_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ifalias_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
const struct net_device *netdev = to_net_dev(dev);
|
|
char tmp[IFALIASZ];
|
|
ssize_t ret = 0;
|
|
|
|
ret = dev_get_alias(netdev, tmp, sizeof(tmp));
|
|
if (ret > 0)
|
|
ret = sprintf(buf, "%s\n", tmp);
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RW(ifalias);
|
|
|
|
static int change_group(struct net_device *dev, unsigned long new_group)
|
|
{
|
|
dev_set_group(dev, (int)new_group);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t group_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, attr, buf, len, change_group);
|
|
}
|
|
NETDEVICE_SHOW(group, fmt_dec);
|
|
static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
|
|
|
|
static int change_proto_down(struct net_device *dev, unsigned long proto_down)
|
|
{
|
|
return dev_change_proto_down(dev, (bool)proto_down);
|
|
}
|
|
|
|
static ssize_t proto_down_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, attr, buf, len, change_proto_down);
|
|
}
|
|
NETDEVICE_SHOW_RW(proto_down, fmt_dec);
|
|
|
|
static ssize_t phys_port_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net_device *netdev = to_net_dev(dev);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
/* The check is also done in dev_get_phys_port_id; this helps returning
|
|
* early without hitting the trylock/restart below.
|
|
*/
|
|
if (!netdev->netdev_ops->ndo_get_phys_port_id)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
if (dev_isalive(netdev)) {
|
|
struct netdev_phys_item_id ppid;
|
|
|
|
ret = dev_get_phys_port_id(netdev, &ppid);
|
|
if (!ret)
|
|
ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RO(phys_port_id);
|
|
|
|
static ssize_t phys_port_name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net_device *netdev = to_net_dev(dev);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
/* The checks are also done in dev_get_phys_port_name; this helps
|
|
* returning early without hitting the trylock/restart below.
|
|
*/
|
|
if (!netdev->netdev_ops->ndo_get_phys_port_name &&
|
|
!netdev->netdev_ops->ndo_get_devlink_port)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
if (dev_isalive(netdev)) {
|
|
char name[IFNAMSIZ];
|
|
|
|
ret = dev_get_phys_port_name(netdev, name, sizeof(name));
|
|
if (!ret)
|
|
ret = sprintf(buf, "%s\n", name);
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RO(phys_port_name);
|
|
|
|
static ssize_t phys_switch_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net_device *netdev = to_net_dev(dev);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
/* The checks are also done in dev_get_phys_port_name; this helps
|
|
* returning early without hitting the trylock/restart below. This works
|
|
* because recurse is false when calling dev_get_port_parent_id.
|
|
*/
|
|
if (!netdev->netdev_ops->ndo_get_port_parent_id &&
|
|
!netdev->netdev_ops->ndo_get_devlink_port)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
if (dev_isalive(netdev)) {
|
|
struct netdev_phys_item_id ppid = { };
|
|
|
|
ret = dev_get_port_parent_id(netdev, &ppid, false);
|
|
if (!ret)
|
|
ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RO(phys_switch_id);
|
|
|
|
static ssize_t threaded_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct net_device *netdev = to_net_dev(dev);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
if (dev_isalive(netdev))
|
|
ret = sprintf(buf, fmt_dec, netdev->threaded);
|
|
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static int modify_napi_threaded(struct net_device *dev, unsigned long val)
|
|
{
|
|
int ret;
|
|
|
|
if (list_empty(&dev->napi_list))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (val != 0 && val != 1)
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = dev_set_threaded(dev, val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t threaded_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
return netdev_store(dev, attr, buf, len, modify_napi_threaded);
|
|
}
|
|
static DEVICE_ATTR_RW(threaded);
|
|
|
|
static struct attribute *net_class_attrs[] __ro_after_init = {
|
|
&dev_attr_netdev_group.attr,
|
|
&dev_attr_type.attr,
|
|
&dev_attr_dev_id.attr,
|
|
&dev_attr_dev_port.attr,
|
|
&dev_attr_iflink.attr,
|
|
&dev_attr_ifindex.attr,
|
|
&dev_attr_name_assign_type.attr,
|
|
&dev_attr_addr_assign_type.attr,
|
|
&dev_attr_addr_len.attr,
|
|
&dev_attr_link_mode.attr,
|
|
&dev_attr_address.attr,
|
|
&dev_attr_broadcast.attr,
|
|
&dev_attr_speed.attr,
|
|
&dev_attr_duplex.attr,
|
|
&dev_attr_dormant.attr,
|
|
&dev_attr_testing.attr,
|
|
&dev_attr_operstate.attr,
|
|
&dev_attr_carrier_changes.attr,
|
|
&dev_attr_ifalias.attr,
|
|
&dev_attr_carrier.attr,
|
|
&dev_attr_mtu.attr,
|
|
&dev_attr_flags.attr,
|
|
&dev_attr_tx_queue_len.attr,
|
|
&dev_attr_gro_flush_timeout.attr,
|
|
&dev_attr_napi_defer_hard_irqs.attr,
|
|
&dev_attr_phys_port_id.attr,
|
|
&dev_attr_phys_port_name.attr,
|
|
&dev_attr_phys_switch_id.attr,
|
|
&dev_attr_proto_down.attr,
|
|
&dev_attr_carrier_up_count.attr,
|
|
&dev_attr_carrier_down_count.attr,
|
|
&dev_attr_threaded.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(net_class);
|
|
|
|
/* Show a given an attribute in the statistics group */
|
|
static ssize_t netstat_show(const struct device *d,
|
|
struct device_attribute *attr, char *buf,
|
|
unsigned long offset)
|
|
{
|
|
struct net_device *dev = to_net_dev(d);
|
|
ssize_t ret = -EINVAL;
|
|
|
|
WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
|
|
offset % sizeof(u64) != 0);
|
|
|
|
read_lock(&dev_base_lock);
|
|
if (dev_isalive(dev)) {
|
|
struct rtnl_link_stats64 temp;
|
|
const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
|
|
|
|
ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
|
|
}
|
|
read_unlock(&dev_base_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* generate a read-only statistics attribute */
|
|
#define NETSTAT_ENTRY(name) \
|
|
static ssize_t name##_show(struct device *d, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
return netstat_show(d, attr, buf, \
|
|
offsetof(struct rtnl_link_stats64, name)); \
|
|
} \
|
|
static DEVICE_ATTR_RO(name)
|
|
|
|
NETSTAT_ENTRY(rx_packets);
|
|
NETSTAT_ENTRY(tx_packets);
|
|
NETSTAT_ENTRY(rx_bytes);
|
|
NETSTAT_ENTRY(tx_bytes);
|
|
NETSTAT_ENTRY(rx_errors);
|
|
NETSTAT_ENTRY(tx_errors);
|
|
NETSTAT_ENTRY(rx_dropped);
|
|
NETSTAT_ENTRY(tx_dropped);
|
|
NETSTAT_ENTRY(multicast);
|
|
NETSTAT_ENTRY(collisions);
|
|
NETSTAT_ENTRY(rx_length_errors);
|
|
NETSTAT_ENTRY(rx_over_errors);
|
|
NETSTAT_ENTRY(rx_crc_errors);
|
|
NETSTAT_ENTRY(rx_frame_errors);
|
|
NETSTAT_ENTRY(rx_fifo_errors);
|
|
NETSTAT_ENTRY(rx_missed_errors);
|
|
NETSTAT_ENTRY(tx_aborted_errors);
|
|
NETSTAT_ENTRY(tx_carrier_errors);
|
|
NETSTAT_ENTRY(tx_fifo_errors);
|
|
NETSTAT_ENTRY(tx_heartbeat_errors);
|
|
NETSTAT_ENTRY(tx_window_errors);
|
|
NETSTAT_ENTRY(rx_compressed);
|
|
NETSTAT_ENTRY(tx_compressed);
|
|
NETSTAT_ENTRY(rx_nohandler);
|
|
|
|
static struct attribute *netstat_attrs[] __ro_after_init = {
|
|
&dev_attr_rx_packets.attr,
|
|
&dev_attr_tx_packets.attr,
|
|
&dev_attr_rx_bytes.attr,
|
|
&dev_attr_tx_bytes.attr,
|
|
&dev_attr_rx_errors.attr,
|
|
&dev_attr_tx_errors.attr,
|
|
&dev_attr_rx_dropped.attr,
|
|
&dev_attr_tx_dropped.attr,
|
|
&dev_attr_multicast.attr,
|
|
&dev_attr_collisions.attr,
|
|
&dev_attr_rx_length_errors.attr,
|
|
&dev_attr_rx_over_errors.attr,
|
|
&dev_attr_rx_crc_errors.attr,
|
|
&dev_attr_rx_frame_errors.attr,
|
|
&dev_attr_rx_fifo_errors.attr,
|
|
&dev_attr_rx_missed_errors.attr,
|
|
&dev_attr_tx_aborted_errors.attr,
|
|
&dev_attr_tx_carrier_errors.attr,
|
|
&dev_attr_tx_fifo_errors.attr,
|
|
&dev_attr_tx_heartbeat_errors.attr,
|
|
&dev_attr_tx_window_errors.attr,
|
|
&dev_attr_rx_compressed.attr,
|
|
&dev_attr_tx_compressed.attr,
|
|
&dev_attr_rx_nohandler.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group netstat_group = {
|
|
.name = "statistics",
|
|
.attrs = netstat_attrs,
|
|
};
|
|
|
|
static struct attribute *wireless_attrs[] = {
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group wireless_group = {
|
|
.name = "wireless",
|
|
.attrs = wireless_attrs,
|
|
};
|
|
|
|
static bool wireless_group_needed(struct net_device *ndev)
|
|
{
|
|
#if IS_ENABLED(CONFIG_CFG80211)
|
|
if (ndev->ieee80211_ptr)
|
|
return true;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_WIRELESS_EXT)
|
|
if (ndev->wireless_handlers)
|
|
return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
#else /* CONFIG_SYSFS */
|
|
#define net_class_groups NULL
|
|
#endif /* CONFIG_SYSFS */
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
#define to_rx_queue_attr(_attr) \
|
|
container_of(_attr, struct rx_queue_attribute, attr)
|
|
|
|
#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
|
|
|
|
static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
|
|
char *buf)
|
|
{
|
|
const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
|
|
struct netdev_rx_queue *queue = to_rx_queue(kobj);
|
|
|
|
if (!attribute->show)
|
|
return -EIO;
|
|
|
|
return attribute->show(queue, buf);
|
|
}
|
|
|
|
static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
|
|
struct netdev_rx_queue *queue = to_rx_queue(kobj);
|
|
|
|
if (!attribute->store)
|
|
return -EIO;
|
|
|
|
return attribute->store(queue, buf, count);
|
|
}
|
|
|
|
static const struct sysfs_ops rx_queue_sysfs_ops = {
|
|
.show = rx_queue_attr_show,
|
|
.store = rx_queue_attr_store,
|
|
};
|
|
|
|
#ifdef CONFIG_RPS
|
|
static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
|
|
{
|
|
struct rps_map *map;
|
|
cpumask_var_t mask;
|
|
int i, len;
|
|
|
|
if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
rcu_read_lock();
|
|
map = rcu_dereference(queue->rps_map);
|
|
if (map)
|
|
for (i = 0; i < map->len; i++)
|
|
cpumask_set_cpu(map->cpus[i], mask);
|
|
|
|
len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
|
|
rcu_read_unlock();
|
|
free_cpumask_var(mask);
|
|
|
|
return len < PAGE_SIZE ? len : -EINVAL;
|
|
}
|
|
|
|
static ssize_t store_rps_map(struct netdev_rx_queue *queue,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct rps_map *old_map, *map;
|
|
cpumask_var_t mask;
|
|
int err, cpu, i;
|
|
static DEFINE_MUTEX(rps_map_mutex);
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
|
|
if (err) {
|
|
free_cpumask_var(mask);
|
|
return err;
|
|
}
|
|
|
|
if (!cpumask_empty(mask)) {
|
|
cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
|
|
cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
|
|
if (cpumask_empty(mask)) {
|
|
free_cpumask_var(mask);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
map = kzalloc(max_t(unsigned int,
|
|
RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
|
|
GFP_KERNEL);
|
|
if (!map) {
|
|
free_cpumask_var(mask);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
i = 0;
|
|
for_each_cpu_and(cpu, mask, cpu_online_mask)
|
|
map->cpus[i++] = cpu;
|
|
|
|
if (i) {
|
|
map->len = i;
|
|
} else {
|
|
kfree(map);
|
|
map = NULL;
|
|
}
|
|
|
|
mutex_lock(&rps_map_mutex);
|
|
old_map = rcu_dereference_protected(queue->rps_map,
|
|
mutex_is_locked(&rps_map_mutex));
|
|
rcu_assign_pointer(queue->rps_map, map);
|
|
|
|
if (map)
|
|
static_branch_inc(&rps_needed);
|
|
if (old_map)
|
|
static_branch_dec(&rps_needed);
|
|
|
|
mutex_unlock(&rps_map_mutex);
|
|
|
|
if (old_map)
|
|
kfree_rcu(old_map, rcu);
|
|
|
|
free_cpumask_var(mask);
|
|
return len;
|
|
}
|
|
|
|
static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
|
|
char *buf)
|
|
{
|
|
struct rps_dev_flow_table *flow_table;
|
|
unsigned long val = 0;
|
|
|
|
rcu_read_lock();
|
|
flow_table = rcu_dereference(queue->rps_flow_table);
|
|
if (flow_table)
|
|
val = (unsigned long)flow_table->mask + 1;
|
|
rcu_read_unlock();
|
|
|
|
return sprintf(buf, "%lu\n", val);
|
|
}
|
|
|
|
static void rps_dev_flow_table_release(struct rcu_head *rcu)
|
|
{
|
|
struct rps_dev_flow_table *table = container_of(rcu,
|
|
struct rps_dev_flow_table, rcu);
|
|
vfree(table);
|
|
}
|
|
|
|
static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
|
|
const char *buf, size_t len)
|
|
{
|
|
unsigned long mask, count;
|
|
struct rps_dev_flow_table *table, *old_table;
|
|
static DEFINE_SPINLOCK(rps_dev_flow_lock);
|
|
int rc;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
rc = kstrtoul(buf, 0, &count);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (count) {
|
|
mask = count - 1;
|
|
/* mask = roundup_pow_of_two(count) - 1;
|
|
* without overflows...
|
|
*/
|
|
while ((mask | (mask >> 1)) != mask)
|
|
mask |= (mask >> 1);
|
|
/* On 64 bit arches, must check mask fits in table->mask (u32),
|
|
* and on 32bit arches, must check
|
|
* RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
|
|
*/
|
|
#if BITS_PER_LONG > 32
|
|
if (mask > (unsigned long)(u32)mask)
|
|
return -EINVAL;
|
|
#else
|
|
if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
|
|
/ sizeof(struct rps_dev_flow)) {
|
|
/* Enforce a limit to prevent overflow */
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
|
|
if (!table)
|
|
return -ENOMEM;
|
|
|
|
table->mask = mask;
|
|
for (count = 0; count <= mask; count++)
|
|
table->flows[count].cpu = RPS_NO_CPU;
|
|
} else {
|
|
table = NULL;
|
|
}
|
|
|
|
spin_lock(&rps_dev_flow_lock);
|
|
old_table = rcu_dereference_protected(queue->rps_flow_table,
|
|
lockdep_is_held(&rps_dev_flow_lock));
|
|
rcu_assign_pointer(queue->rps_flow_table, table);
|
|
spin_unlock(&rps_dev_flow_lock);
|
|
|
|
if (old_table)
|
|
call_rcu(&old_table->rcu, rps_dev_flow_table_release);
|
|
|
|
return len;
|
|
}
|
|
|
|
static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
|
|
= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
|
|
|
|
static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
|
|
= __ATTR(rps_flow_cnt, 0644,
|
|
show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
|
|
#endif /* CONFIG_RPS */
|
|
|
|
static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
|
|
#ifdef CONFIG_RPS
|
|
&rps_cpus_attribute.attr,
|
|
&rps_dev_flow_table_cnt_attribute.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(rx_queue_default);
|
|
|
|
static void rx_queue_release(struct kobject *kobj)
|
|
{
|
|
struct netdev_rx_queue *queue = to_rx_queue(kobj);
|
|
#ifdef CONFIG_RPS
|
|
struct rps_map *map;
|
|
struct rps_dev_flow_table *flow_table;
|
|
|
|
map = rcu_dereference_protected(queue->rps_map, 1);
|
|
if (map) {
|
|
RCU_INIT_POINTER(queue->rps_map, NULL);
|
|
kfree_rcu(map, rcu);
|
|
}
|
|
|
|
flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
|
|
if (flow_table) {
|
|
RCU_INIT_POINTER(queue->rps_flow_table, NULL);
|
|
call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
|
|
}
|
|
#endif
|
|
|
|
memset(kobj, 0, sizeof(*kobj));
|
|
dev_put_track(queue->dev, &queue->dev_tracker);
|
|
}
|
|
|
|
static const void *rx_queue_namespace(struct kobject *kobj)
|
|
{
|
|
struct netdev_rx_queue *queue = to_rx_queue(kobj);
|
|
struct device *dev = &queue->dev->dev;
|
|
const void *ns = NULL;
|
|
|
|
if (dev->class && dev->class->ns_type)
|
|
ns = dev->class->namespace(dev);
|
|
|
|
return ns;
|
|
}
|
|
|
|
static void rx_queue_get_ownership(struct kobject *kobj,
|
|
kuid_t *uid, kgid_t *gid)
|
|
{
|
|
const struct net *net = rx_queue_namespace(kobj);
|
|
|
|
net_ns_get_ownership(net, uid, gid);
|
|
}
|
|
|
|
static struct kobj_type rx_queue_ktype __ro_after_init = {
|
|
.sysfs_ops = &rx_queue_sysfs_ops,
|
|
.release = rx_queue_release,
|
|
.default_groups = rx_queue_default_groups,
|
|
.namespace = rx_queue_namespace,
|
|
.get_ownership = rx_queue_get_ownership,
|
|
};
|
|
|
|
static int rx_queue_add_kobject(struct net_device *dev, int index)
|
|
{
|
|
struct netdev_rx_queue *queue = dev->_rx + index;
|
|
struct kobject *kobj = &queue->kobj;
|
|
int error = 0;
|
|
|
|
/* Kobject_put later will trigger rx_queue_release call which
|
|
* decreases dev refcount: Take that reference here
|
|
*/
|
|
dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
|
|
|
|
kobj->kset = dev->queues_kset;
|
|
error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
|
|
"rx-%u", index);
|
|
if (error)
|
|
goto err;
|
|
|
|
if (dev->sysfs_rx_queue_group) {
|
|
error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
|
|
if (error)
|
|
goto err;
|
|
}
|
|
|
|
kobject_uevent(kobj, KOBJ_ADD);
|
|
|
|
return error;
|
|
|
|
err:
|
|
kobject_put(kobj);
|
|
return error;
|
|
}
|
|
|
|
static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
|
|
kgid_t kgid)
|
|
{
|
|
struct netdev_rx_queue *queue = dev->_rx + index;
|
|
struct kobject *kobj = &queue->kobj;
|
|
int error;
|
|
|
|
error = sysfs_change_owner(kobj, kuid, kgid);
|
|
if (error)
|
|
return error;
|
|
|
|
if (dev->sysfs_rx_queue_group)
|
|
error = sysfs_group_change_owner(
|
|
kobj, dev->sysfs_rx_queue_group, kuid, kgid);
|
|
|
|
return error;
|
|
}
|
|
#endif /* CONFIG_SYSFS */
|
|
|
|
int
|
|
net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
|
|
{
|
|
#ifdef CONFIG_SYSFS
|
|
int i;
|
|
int error = 0;
|
|
|
|
#ifndef CONFIG_RPS
|
|
if (!dev->sysfs_rx_queue_group)
|
|
return 0;
|
|
#endif
|
|
for (i = old_num; i < new_num; i++) {
|
|
error = rx_queue_add_kobject(dev, i);
|
|
if (error) {
|
|
new_num = old_num;
|
|
break;
|
|
}
|
|
}
|
|
|
|
while (--i >= new_num) {
|
|
struct kobject *kobj = &dev->_rx[i].kobj;
|
|
|
|
if (!refcount_read(&dev_net(dev)->ns.count))
|
|
kobj->uevent_suppress = 1;
|
|
if (dev->sysfs_rx_queue_group)
|
|
sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
|
|
kobject_put(kobj);
|
|
}
|
|
|
|
return error;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static int net_rx_queue_change_owner(struct net_device *dev, int num,
|
|
kuid_t kuid, kgid_t kgid)
|
|
{
|
|
#ifdef CONFIG_SYSFS
|
|
int error = 0;
|
|
int i;
|
|
|
|
#ifndef CONFIG_RPS
|
|
if (!dev->sysfs_rx_queue_group)
|
|
return 0;
|
|
#endif
|
|
for (i = 0; i < num; i++) {
|
|
error = rx_queue_change_owner(dev, i, kuid, kgid);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
/*
|
|
* netdev_queue sysfs structures and functions.
|
|
*/
|
|
struct netdev_queue_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct netdev_queue *queue, char *buf);
|
|
ssize_t (*store)(struct netdev_queue *queue,
|
|
const char *buf, size_t len);
|
|
};
|
|
#define to_netdev_queue_attr(_attr) \
|
|
container_of(_attr, struct netdev_queue_attribute, attr)
|
|
|
|
#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
|
|
|
|
static ssize_t netdev_queue_attr_show(struct kobject *kobj,
|
|
struct attribute *attr, char *buf)
|
|
{
|
|
const struct netdev_queue_attribute *attribute
|
|
= to_netdev_queue_attr(attr);
|
|
struct netdev_queue *queue = to_netdev_queue(kobj);
|
|
|
|
if (!attribute->show)
|
|
return -EIO;
|
|
|
|
return attribute->show(queue, buf);
|
|
}
|
|
|
|
static ssize_t netdev_queue_attr_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
const struct netdev_queue_attribute *attribute
|
|
= to_netdev_queue_attr(attr);
|
|
struct netdev_queue *queue = to_netdev_queue(kobj);
|
|
|
|
if (!attribute->store)
|
|
return -EIO;
|
|
|
|
return attribute->store(queue, buf, count);
|
|
}
|
|
|
|
static const struct sysfs_ops netdev_queue_sysfs_ops = {
|
|
.show = netdev_queue_attr_show,
|
|
.store = netdev_queue_attr_store,
|
|
};
|
|
|
|
static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
|
|
{
|
|
unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
|
|
|
|
return sprintf(buf, fmt_ulong, trans_timeout);
|
|
}
|
|
|
|
static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
unsigned int i;
|
|
|
|
i = queue - dev->_tx;
|
|
BUG_ON(i >= dev->num_tx_queues);
|
|
|
|
return i;
|
|
}
|
|
|
|
static ssize_t traffic_class_show(struct netdev_queue *queue,
|
|
char *buf)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
int num_tc, tc;
|
|
int index;
|
|
|
|
if (!netif_is_multiqueue(dev))
|
|
return -ENOENT;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
index = get_netdev_queue_index(queue);
|
|
|
|
/* If queue belongs to subordinate dev use its TC mapping */
|
|
dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
|
|
|
|
num_tc = dev->num_tc;
|
|
tc = netdev_txq_to_tc(dev, index);
|
|
|
|
rtnl_unlock();
|
|
|
|
if (tc < 0)
|
|
return -EINVAL;
|
|
|
|
/* We can report the traffic class one of two ways:
|
|
* Subordinate device traffic classes are reported with the traffic
|
|
* class first, and then the subordinate class so for example TC0 on
|
|
* subordinate device 2 will be reported as "0-2". If the queue
|
|
* belongs to the root device it will be reported with just the
|
|
* traffic class, so just "0" for TC 0 for example.
|
|
*/
|
|
return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
|
|
sprintf(buf, "%d\n", tc);
|
|
}
|
|
|
|
#ifdef CONFIG_XPS
|
|
static ssize_t tx_maxrate_show(struct netdev_queue *queue,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", queue->tx_maxrate);
|
|
}
|
|
|
|
static ssize_t tx_maxrate_store(struct netdev_queue *queue,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
int err, index = get_netdev_queue_index(queue);
|
|
u32 rate = 0;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* The check is also done later; this helps returning early without
|
|
* hitting the trylock/restart below.
|
|
*/
|
|
if (!dev->netdev_ops->ndo_set_tx_maxrate)
|
|
return -EOPNOTSUPP;
|
|
|
|
err = kstrtou32(buf, 10, &rate);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
err = -EOPNOTSUPP;
|
|
if (dev->netdev_ops->ndo_set_tx_maxrate)
|
|
err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
|
|
|
|
rtnl_unlock();
|
|
if (!err) {
|
|
queue->tx_maxrate = rate;
|
|
return len;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
|
|
= __ATTR_RW(tx_maxrate);
|
|
#endif
|
|
|
|
static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
|
|
= __ATTR_RO(tx_timeout);
|
|
|
|
static struct netdev_queue_attribute queue_traffic_class __ro_after_init
|
|
= __ATTR_RO(traffic_class);
|
|
|
|
#ifdef CONFIG_BQL
|
|
/*
|
|
* Byte queue limits sysfs structures and functions.
|
|
*/
|
|
static ssize_t bql_show(char *buf, unsigned int value)
|
|
{
|
|
return sprintf(buf, "%u\n", value);
|
|
}
|
|
|
|
static ssize_t bql_set(const char *buf, const size_t count,
|
|
unsigned int *pvalue)
|
|
{
|
|
unsigned int value;
|
|
int err;
|
|
|
|
if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
|
|
value = DQL_MAX_LIMIT;
|
|
} else {
|
|
err = kstrtouint(buf, 10, &value);
|
|
if (err < 0)
|
|
return err;
|
|
if (value > DQL_MAX_LIMIT)
|
|
return -EINVAL;
|
|
}
|
|
|
|
*pvalue = value;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t bql_show_hold_time(struct netdev_queue *queue,
|
|
char *buf)
|
|
{
|
|
struct dql *dql = &queue->dql;
|
|
|
|
return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
|
|
}
|
|
|
|
static ssize_t bql_set_hold_time(struct netdev_queue *queue,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct dql *dql = &queue->dql;
|
|
unsigned int value;
|
|
int err;
|
|
|
|
err = kstrtouint(buf, 10, &value);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
dql->slack_hold_time = msecs_to_jiffies(value);
|
|
|
|
return len;
|
|
}
|
|
|
|
static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
|
|
= __ATTR(hold_time, 0644,
|
|
bql_show_hold_time, bql_set_hold_time);
|
|
|
|
static ssize_t bql_show_inflight(struct netdev_queue *queue,
|
|
char *buf)
|
|
{
|
|
struct dql *dql = &queue->dql;
|
|
|
|
return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
|
|
}
|
|
|
|
static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
|
|
__ATTR(inflight, 0444, bql_show_inflight, NULL);
|
|
|
|
#define BQL_ATTR(NAME, FIELD) \
|
|
static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
|
|
char *buf) \
|
|
{ \
|
|
return bql_show(buf, queue->dql.FIELD); \
|
|
} \
|
|
\
|
|
static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
|
|
const char *buf, size_t len) \
|
|
{ \
|
|
return bql_set(buf, len, &queue->dql.FIELD); \
|
|
} \
|
|
\
|
|
static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
|
|
= __ATTR(NAME, 0644, \
|
|
bql_show_ ## NAME, bql_set_ ## NAME)
|
|
|
|
BQL_ATTR(limit, limit);
|
|
BQL_ATTR(limit_max, max_limit);
|
|
BQL_ATTR(limit_min, min_limit);
|
|
|
|
static struct attribute *dql_attrs[] __ro_after_init = {
|
|
&bql_limit_attribute.attr,
|
|
&bql_limit_max_attribute.attr,
|
|
&bql_limit_min_attribute.attr,
|
|
&bql_hold_time_attribute.attr,
|
|
&bql_inflight_attribute.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group dql_group = {
|
|
.name = "byte_queue_limits",
|
|
.attrs = dql_attrs,
|
|
};
|
|
#endif /* CONFIG_BQL */
|
|
|
|
#ifdef CONFIG_XPS
|
|
static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
|
|
int tc, char *buf, enum xps_map_type type)
|
|
{
|
|
struct xps_dev_maps *dev_maps;
|
|
unsigned long *mask;
|
|
unsigned int nr_ids;
|
|
int j, len;
|
|
|
|
rcu_read_lock();
|
|
dev_maps = rcu_dereference(dev->xps_maps[type]);
|
|
|
|
/* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
|
|
* when dev_maps hasn't been allocated yet, to be backward compatible.
|
|
*/
|
|
nr_ids = dev_maps ? dev_maps->nr_ids :
|
|
(type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
|
|
|
|
mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
|
|
if (!mask) {
|
|
rcu_read_unlock();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!dev_maps || tc >= dev_maps->num_tc)
|
|
goto out_no_maps;
|
|
|
|
for (j = 0; j < nr_ids; j++) {
|
|
int i, tci = j * dev_maps->num_tc + tc;
|
|
struct xps_map *map;
|
|
|
|
map = rcu_dereference(dev_maps->attr_map[tci]);
|
|
if (!map)
|
|
continue;
|
|
|
|
for (i = map->len; i--;) {
|
|
if (map->queues[i] == index) {
|
|
__set_bit(j, mask);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
out_no_maps:
|
|
rcu_read_unlock();
|
|
|
|
len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
|
|
bitmap_free(mask);
|
|
|
|
return len < PAGE_SIZE ? len : -EINVAL;
|
|
}
|
|
|
|
static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
unsigned int index;
|
|
int len, tc;
|
|
|
|
if (!netif_is_multiqueue(dev))
|
|
return -ENOENT;
|
|
|
|
index = get_netdev_queue_index(queue);
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
/* If queue belongs to subordinate dev use its map */
|
|
dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
|
|
|
|
tc = netdev_txq_to_tc(dev, index);
|
|
if (tc < 0) {
|
|
rtnl_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Make sure the subordinate device can't be freed */
|
|
get_device(&dev->dev);
|
|
rtnl_unlock();
|
|
|
|
len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
|
|
|
|
put_device(&dev->dev);
|
|
return len;
|
|
}
|
|
|
|
static ssize_t xps_cpus_store(struct netdev_queue *queue,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
unsigned int index;
|
|
cpumask_var_t mask;
|
|
int err;
|
|
|
|
if (!netif_is_multiqueue(dev))
|
|
return -ENOENT;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
index = get_netdev_queue_index(queue);
|
|
|
|
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
|
|
if (err) {
|
|
free_cpumask_var(mask);
|
|
return err;
|
|
}
|
|
|
|
if (!rtnl_trylock()) {
|
|
free_cpumask_var(mask);
|
|
return restart_syscall();
|
|
}
|
|
|
|
err = netif_set_xps_queue(dev, mask, index);
|
|
rtnl_unlock();
|
|
|
|
free_cpumask_var(mask);
|
|
|
|
return err ? : len;
|
|
}
|
|
|
|
static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
|
|
= __ATTR_RW(xps_cpus);
|
|
|
|
static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
unsigned int index;
|
|
int tc;
|
|
|
|
index = get_netdev_queue_index(queue);
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
tc = netdev_txq_to_tc(dev, index);
|
|
rtnl_unlock();
|
|
if (tc < 0)
|
|
return -EINVAL;
|
|
|
|
return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
|
|
}
|
|
|
|
static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
|
|
size_t len)
|
|
{
|
|
struct net_device *dev = queue->dev;
|
|
struct net *net = dev_net(dev);
|
|
unsigned long *mask;
|
|
unsigned int index;
|
|
int err;
|
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
|
|
if (!mask)
|
|
return -ENOMEM;
|
|
|
|
index = get_netdev_queue_index(queue);
|
|
|
|
err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
|
|
if (err) {
|
|
bitmap_free(mask);
|
|
return err;
|
|
}
|
|
|
|
if (!rtnl_trylock()) {
|
|
bitmap_free(mask);
|
|
return restart_syscall();
|
|
}
|
|
|
|
cpus_read_lock();
|
|
err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
|
|
cpus_read_unlock();
|
|
|
|
rtnl_unlock();
|
|
|
|
bitmap_free(mask);
|
|
return err ? : len;
|
|
}
|
|
|
|
static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
|
|
= __ATTR_RW(xps_rxqs);
|
|
#endif /* CONFIG_XPS */
|
|
|
|
static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
|
|
&queue_trans_timeout.attr,
|
|
&queue_traffic_class.attr,
|
|
#ifdef CONFIG_XPS
|
|
&xps_cpus_attribute.attr,
|
|
&xps_rxqs_attribute.attr,
|
|
&queue_tx_maxrate.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(netdev_queue_default);
|
|
|
|
static void netdev_queue_release(struct kobject *kobj)
|
|
{
|
|
struct netdev_queue *queue = to_netdev_queue(kobj);
|
|
|
|
memset(kobj, 0, sizeof(*kobj));
|
|
dev_put_track(queue->dev, &queue->dev_tracker);
|
|
}
|
|
|
|
static const void *netdev_queue_namespace(struct kobject *kobj)
|
|
{
|
|
struct netdev_queue *queue = to_netdev_queue(kobj);
|
|
struct device *dev = &queue->dev->dev;
|
|
const void *ns = NULL;
|
|
|
|
if (dev->class && dev->class->ns_type)
|
|
ns = dev->class->namespace(dev);
|
|
|
|
return ns;
|
|
}
|
|
|
|
static void netdev_queue_get_ownership(struct kobject *kobj,
|
|
kuid_t *uid, kgid_t *gid)
|
|
{
|
|
const struct net *net = netdev_queue_namespace(kobj);
|
|
|
|
net_ns_get_ownership(net, uid, gid);
|
|
}
|
|
|
|
static struct kobj_type netdev_queue_ktype __ro_after_init = {
|
|
.sysfs_ops = &netdev_queue_sysfs_ops,
|
|
.release = netdev_queue_release,
|
|
.default_groups = netdev_queue_default_groups,
|
|
.namespace = netdev_queue_namespace,
|
|
.get_ownership = netdev_queue_get_ownership,
|
|
};
|
|
|
|
static int netdev_queue_add_kobject(struct net_device *dev, int index)
|
|
{
|
|
struct netdev_queue *queue = dev->_tx + index;
|
|
struct kobject *kobj = &queue->kobj;
|
|
int error = 0;
|
|
|
|
/* Kobject_put later will trigger netdev_queue_release call
|
|
* which decreases dev refcount: Take that reference here
|
|
*/
|
|
dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
|
|
|
|
kobj->kset = dev->queues_kset;
|
|
error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
|
|
"tx-%u", index);
|
|
if (error)
|
|
goto err;
|
|
|
|
#ifdef CONFIG_BQL
|
|
error = sysfs_create_group(kobj, &dql_group);
|
|
if (error)
|
|
goto err;
|
|
#endif
|
|
|
|
kobject_uevent(kobj, KOBJ_ADD);
|
|
return 0;
|
|
|
|
err:
|
|
kobject_put(kobj);
|
|
return error;
|
|
}
|
|
|
|
static int tx_queue_change_owner(struct net_device *ndev, int index,
|
|
kuid_t kuid, kgid_t kgid)
|
|
{
|
|
struct netdev_queue *queue = ndev->_tx + index;
|
|
struct kobject *kobj = &queue->kobj;
|
|
int error;
|
|
|
|
error = sysfs_change_owner(kobj, kuid, kgid);
|
|
if (error)
|
|
return error;
|
|
|
|
#ifdef CONFIG_BQL
|
|
error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
|
|
#endif
|
|
return error;
|
|
}
|
|
#endif /* CONFIG_SYSFS */
|
|
|
|
int
|
|
netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
|
|
{
|
|
#ifdef CONFIG_SYSFS
|
|
int i;
|
|
int error = 0;
|
|
|
|
/* Tx queue kobjects are allowed to be updated when a device is being
|
|
* unregistered, but solely to remove queues from qdiscs. Any path
|
|
* adding queues should be fixed.
|
|
*/
|
|
WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
|
|
"New queues can't be registered after device unregistration.");
|
|
|
|
for (i = old_num; i < new_num; i++) {
|
|
error = netdev_queue_add_kobject(dev, i);
|
|
if (error) {
|
|
new_num = old_num;
|
|
break;
|
|
}
|
|
}
|
|
|
|
while (--i >= new_num) {
|
|
struct netdev_queue *queue = dev->_tx + i;
|
|
|
|
if (!refcount_read(&dev_net(dev)->ns.count))
|
|
queue->kobj.uevent_suppress = 1;
|
|
#ifdef CONFIG_BQL
|
|
sysfs_remove_group(&queue->kobj, &dql_group);
|
|
#endif
|
|
kobject_put(&queue->kobj);
|
|
}
|
|
|
|
return error;
|
|
#else
|
|
return 0;
|
|
#endif /* CONFIG_SYSFS */
|
|
}
|
|
|
|
static int net_tx_queue_change_owner(struct net_device *dev, int num,
|
|
kuid_t kuid, kgid_t kgid)
|
|
{
|
|
#ifdef CONFIG_SYSFS
|
|
int error = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < num; i++) {
|
|
error = tx_queue_change_owner(dev, i, kuid, kgid);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
#else
|
|
return 0;
|
|
#endif /* CONFIG_SYSFS */
|
|
}
|
|
|
|
static int register_queue_kobjects(struct net_device *dev)
|
|
{
|
|
int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
dev->queues_kset = kset_create_and_add("queues",
|
|
NULL, &dev->dev.kobj);
|
|
if (!dev->queues_kset)
|
|
return -ENOMEM;
|
|
real_rx = dev->real_num_rx_queues;
|
|
#endif
|
|
real_tx = dev->real_num_tx_queues;
|
|
|
|
error = net_rx_queue_update_kobjects(dev, 0, real_rx);
|
|
if (error)
|
|
goto error;
|
|
rxq = real_rx;
|
|
|
|
error = netdev_queue_update_kobjects(dev, 0, real_tx);
|
|
if (error)
|
|
goto error;
|
|
txq = real_tx;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
netdev_queue_update_kobjects(dev, txq, 0);
|
|
net_rx_queue_update_kobjects(dev, rxq, 0);
|
|
#ifdef CONFIG_SYSFS
|
|
kset_unregister(dev->queues_kset);
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
|
|
{
|
|
int error = 0, real_rx = 0, real_tx = 0;
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
if (ndev->queues_kset) {
|
|
error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
|
|
if (error)
|
|
return error;
|
|
}
|
|
real_rx = ndev->real_num_rx_queues;
|
|
#endif
|
|
real_tx = ndev->real_num_tx_queues;
|
|
|
|
error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
|
|
if (error)
|
|
return error;
|
|
|
|
error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
|
|
if (error)
|
|
return error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void remove_queue_kobjects(struct net_device *dev)
|
|
{
|
|
int real_rx = 0, real_tx = 0;
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
real_rx = dev->real_num_rx_queues;
|
|
#endif
|
|
real_tx = dev->real_num_tx_queues;
|
|
|
|
net_rx_queue_update_kobjects(dev, real_rx, 0);
|
|
netdev_queue_update_kobjects(dev, real_tx, 0);
|
|
|
|
dev->real_num_rx_queues = 0;
|
|
dev->real_num_tx_queues = 0;
|
|
#ifdef CONFIG_SYSFS
|
|
kset_unregister(dev->queues_kset);
|
|
#endif
|
|
}
|
|
|
|
static bool net_current_may_mount(void)
|
|
{
|
|
struct net *net = current->nsproxy->net_ns;
|
|
|
|
return ns_capable(net->user_ns, CAP_SYS_ADMIN);
|
|
}
|
|
|
|
static void *net_grab_current_ns(void)
|
|
{
|
|
struct net *ns = current->nsproxy->net_ns;
|
|
#ifdef CONFIG_NET_NS
|
|
if (ns)
|
|
refcount_inc(&ns->passive);
|
|
#endif
|
|
return ns;
|
|
}
|
|
|
|
static const void *net_initial_ns(void)
|
|
{
|
|
return &init_net;
|
|
}
|
|
|
|
static const void *net_netlink_ns(struct sock *sk)
|
|
{
|
|
return sock_net(sk);
|
|
}
|
|
|
|
const struct kobj_ns_type_operations net_ns_type_operations = {
|
|
.type = KOBJ_NS_TYPE_NET,
|
|
.current_may_mount = net_current_may_mount,
|
|
.grab_current_ns = net_grab_current_ns,
|
|
.netlink_ns = net_netlink_ns,
|
|
.initial_ns = net_initial_ns,
|
|
.drop_ns = net_drop_ns,
|
|
};
|
|
EXPORT_SYMBOL_GPL(net_ns_type_operations);
|
|
|
|
static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
|
|
{
|
|
struct net_device *dev = to_net_dev(d);
|
|
int retval;
|
|
|
|
/* pass interface to uevent. */
|
|
retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
|
|
if (retval)
|
|
goto exit;
|
|
|
|
/* pass ifindex to uevent.
|
|
* ifindex is useful as it won't change (interface name may change)
|
|
* and is what RtNetlink uses natively.
|
|
*/
|
|
retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* netdev_release -- destroy and free a dead device.
|
|
* Called when last reference to device kobject is gone.
|
|
*/
|
|
static void netdev_release(struct device *d)
|
|
{
|
|
struct net_device *dev = to_net_dev(d);
|
|
|
|
BUG_ON(dev->reg_state != NETREG_RELEASED);
|
|
|
|
/* no need to wait for rcu grace period:
|
|
* device is dead and about to be freed.
|
|
*/
|
|
kfree(rcu_access_pointer(dev->ifalias));
|
|
netdev_freemem(dev);
|
|
}
|
|
|
|
static const void *net_namespace(struct device *d)
|
|
{
|
|
struct net_device *dev = to_net_dev(d);
|
|
|
|
return dev_net(dev);
|
|
}
|
|
|
|
static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
|
|
{
|
|
struct net_device *dev = to_net_dev(d);
|
|
const struct net *net = dev_net(dev);
|
|
|
|
net_ns_get_ownership(net, uid, gid);
|
|
}
|
|
|
|
static struct class net_class __ro_after_init = {
|
|
.name = "net",
|
|
.dev_release = netdev_release,
|
|
.dev_groups = net_class_groups,
|
|
.dev_uevent = netdev_uevent,
|
|
.ns_type = &net_ns_type_operations,
|
|
.namespace = net_namespace,
|
|
.get_ownership = net_get_ownership,
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static int of_dev_node_match(struct device *dev, const void *data)
|
|
{
|
|
for (; dev; dev = dev->parent) {
|
|
if (dev->of_node == data)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* of_find_net_device_by_node - lookup the net device for the device node
|
|
* @np: OF device node
|
|
*
|
|
* Looks up the net_device structure corresponding with the device node.
|
|
* If successful, returns a pointer to the net_device with the embedded
|
|
* struct device refcount incremented by one, or NULL on failure. The
|
|
* refcount must be dropped when done with the net_device.
|
|
*/
|
|
struct net_device *of_find_net_device_by_node(struct device_node *np)
|
|
{
|
|
struct device *dev;
|
|
|
|
dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
return to_net_dev(dev);
|
|
}
|
|
EXPORT_SYMBOL(of_find_net_device_by_node);
|
|
#endif
|
|
|
|
/* Delete sysfs entries but hold kobject reference until after all
|
|
* netdev references are gone.
|
|
*/
|
|
void netdev_unregister_kobject(struct net_device *ndev)
|
|
{
|
|
struct device *dev = &ndev->dev;
|
|
|
|
if (!refcount_read(&dev_net(ndev)->ns.count))
|
|
dev_set_uevent_suppress(dev, 1);
|
|
|
|
kobject_get(&dev->kobj);
|
|
|
|
remove_queue_kobjects(ndev);
|
|
|
|
pm_runtime_set_memalloc_noio(dev, false);
|
|
|
|
device_del(dev);
|
|
}
|
|
|
|
/* Create sysfs entries for network device. */
|
|
int netdev_register_kobject(struct net_device *ndev)
|
|
{
|
|
struct device *dev = &ndev->dev;
|
|
const struct attribute_group **groups = ndev->sysfs_groups;
|
|
int error = 0;
|
|
|
|
device_initialize(dev);
|
|
dev->class = &net_class;
|
|
dev->platform_data = ndev;
|
|
dev->groups = groups;
|
|
|
|
dev_set_name(dev, "%s", ndev->name);
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
/* Allow for a device specific group */
|
|
if (*groups)
|
|
groups++;
|
|
|
|
*groups++ = &netstat_group;
|
|
|
|
if (wireless_group_needed(ndev))
|
|
*groups++ = &wireless_group;
|
|
#endif /* CONFIG_SYSFS */
|
|
|
|
error = device_add(dev);
|
|
if (error)
|
|
return error;
|
|
|
|
error = register_queue_kobjects(ndev);
|
|
if (error) {
|
|
device_del(dev);
|
|
return error;
|
|
}
|
|
|
|
pm_runtime_set_memalloc_noio(dev, true);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* Change owner for sysfs entries when moving network devices across network
|
|
* namespaces owned by different user namespaces.
|
|
*/
|
|
int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
|
|
const struct net *net_new)
|
|
{
|
|
kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
|
|
kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
|
|
struct device *dev = &ndev->dev;
|
|
int error;
|
|
|
|
net_ns_get_ownership(net_old, &old_uid, &old_gid);
|
|
net_ns_get_ownership(net_new, &new_uid, &new_gid);
|
|
|
|
/* The network namespace was changed but the owning user namespace is
|
|
* identical so there's no need to change the owner of sysfs entries.
|
|
*/
|
|
if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
|
|
return 0;
|
|
|
|
error = device_change_owner(dev, new_uid, new_gid);
|
|
if (error)
|
|
return error;
|
|
|
|
error = queue_change_owner(ndev, new_uid, new_gid);
|
|
if (error)
|
|
return error;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int netdev_class_create_file_ns(const struct class_attribute *class_attr,
|
|
const void *ns)
|
|
{
|
|
return class_create_file_ns(&net_class, class_attr, ns);
|
|
}
|
|
EXPORT_SYMBOL(netdev_class_create_file_ns);
|
|
|
|
void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
|
|
const void *ns)
|
|
{
|
|
class_remove_file_ns(&net_class, class_attr, ns);
|
|
}
|
|
EXPORT_SYMBOL(netdev_class_remove_file_ns);
|
|
|
|
int __init netdev_kobject_init(void)
|
|
{
|
|
kobj_ns_type_register(&net_ns_type_operations);
|
|
return class_register(&net_class);
|
|
}
|