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udev比對兩張網卡

目錄

​​一、問題描述​​

​​二、問題處理​​

​​udevadm info -a -p /sys/class/net/FE0​​

​​udevadm info -a -p /sys/class/net/FE1​​

一、問題描述

        本人使用兩張以太網卡，分别為emac、gmac，insmod加載兩張網卡驅動後，一張為FE0，一張為eth0，與我的初衷需要生成的FE0、FE1不符合，出現問題的udev配置檔案如下

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="FE0"

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="FE1"

通過udevadm monitor指令監控發現，其實以上兩條規則比對的内容是一緻的，導緻無法生産FE0、FE1，是以需要增加一條比對鍵來區分這兩個網卡裝置。

二、問題處理

首先我們需要找到這兩個裝置的差異項，通過udevadm info指令

udevadm info -a -p /sys/class/net/FE0 

clou@SMIOS:/etc/udev/rules.d# udevadm info -a -p /sys/class/net/FE0

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/soc/emac0/net/FE0':
    KERNEL=="FE0"
    SUBSYSTEM=="net"
    DRIVER==""
    ATTR{addr_assign_type}=="3"
    ATTR{addr_len}=="6"
    ATTR{address}=="7a:56:90:5b:2f:4f"
    ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
    ATTR{carrier}=="1"
    ATTR{dev_id}=="0x0"
    ATTR{dormant}=="0"
    ATTR{duplex}=="full"
    ATTR{flags}=="0x1003"
    ATTR{ifalias}==""
    ATTR{ifindex}=="19"
    ATTR{iflink}=="19"
    ATTR{link_mode}=="0"
    ATTR{mtu}=="1500"
    ATTR{netdev_group}=="0"
    ATTR{operstate}=="up"
    ATTR{power/async}=="disabled"
    ATTR{power/control}=="auto"
    ATTR{power/runtime_active_kids}=="0"
    ATTR{power/runtime_active_time}=="0"
    ATTR{power/runtime_enabled}=="disabled"
    ATTR{power/runtime_status}=="unsupported"
    ATTR{power/runtime_suspended_time}=="0"
    ATTR{power/runtime_usage}=="0"
    ATTR{queues/rx-0/rps_cpus}=="0"
    ATTR{queues/rx-0/rps_flow_cnt}=="0"
    ATTR{queues/tx-0/byte_queue_limits/hold_time}=="1000"
    ATTR{queues/tx-0/byte_queue_limits/inflight}=="0"
    ATTR{queues/tx-0/byte_queue_limits/limit}=="0"
    ATTR{queues/tx-0/byte_queue_limits/limit_max}=="1879048192"
    ATTR{queues/tx-0/byte_queue_limits/limit_min}=="0"
    ATTR{queues/tx-0/tx_timeout}=="0"
    ATTR{queues/tx-0/xps_cpus}=="0"
    ATTR{speed}=="100"
    ATTR{statistics/collisions}=="0"
    ATTR{statistics/multicast}=="0"
    ATTR{statistics/rx_bytes}=="217282"
    ATTR{statistics/rx_compressed}=="0"
    ATTR{statistics/rx_crc_errors}=="0"
    ATTR{statistics/rx_dropped}=="7"
    ATTR{statistics/rx_errors}=="0"
    ATTR{statistics/rx_fifo_errors}=="0"
    ATTR{statistics/rx_frame_errors}=="0"
    ATTR{statistics/rx_length_errors}=="0"
    ATTR{statistics/rx_missed_errors}=="0"
    ATTR{statistics/rx_over_errors}=="0"
    ATTR{statistics/rx_packets}=="1981"
    ATTR{statistics/tx_aborted_errors}=="0"
    ATTR{statistics/tx_bytes}=="46857"
    ATTR{statistics/tx_carrier_errors}=="0"
    ATTR{statistics/tx_compressed}=="0"
    ATTR{statistics/tx_dropped}=="0"
    ATTR{statistics/tx_errors}=="0"
    ATTR{statistics/tx_fifo_errors}=="0"
    ATTR{statistics/tx_heartbeat_errors}=="0"
    ATTR{statistics/tx_packets}=="328"
    ATTR{statistics/tx_window_errors}=="0"
    ATTR{tx_queue_len}=="1000"
    ATTR{type}=="1"

  looking at parent device '/devices/soc/emac0':
    KERNELS=="emac0"
    SUBSYSTEMS=="platform"
    DRIVERS=="sun4i-emac"
    ATTRS{power/async}=="disabled"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_kids}=="0"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_enabled}=="disabled"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{power/runtime_usage}=="0"

  looking at parent device '/devices/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS==""
    ATTRS{power/async}=="disabled"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_kids}=="0"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_enabled}=="disabled"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{power/runtime_usage}=="0"

注意其中的比對鍵：KERNELS=="emac0"

udevadm info -a -p /sys/class/net/FE1 

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/soc/gmac0/net/FE1':
    KERNEL=="FE1"
    SUBSYSTEM=="net"
    DRIVER==""
    ATTR{addr_assign_type}=="0"
    ATTR{addr_len}=="6"
    ATTR{address}=="36:c9:e3:f1:b8:05"
    ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
    ATTR{dev_id}=="0x0"
    ATTR{flags}=="0x1002"
    ATTR{ifalias}==""
    ATTR{ifindex}=="32"
    ATTR{iflink}=="32"
    ATTR{link_mode}=="0"
    ATTR{mtu}=="1500"
    ATTR{netdev_group}=="0"
    ATTR{operstate}=="down"
    ATTR{power/async}=="disabled"
    ATTR{power/control}=="auto"
    ATTR{power/runtime_active_kids}=="0"
    ATTR{power/runtime_active_time}=="0"
    ATTR{power/runtime_enabled}=="disabled"
    ATTR{power/runtime_status}=="unsupported"
    ATTR{power/runtime_suspended_time}=="0"
    ATTR{power/runtime_usage}=="0"
    ATTR{queues/rx-0/rps_cpus}=="0"
    ATTR{queues/rx-0/rps_flow_cnt}=="0"
    ATTR{queues/tx-0/byte_queue_limits/hold_time}=="1000"
    ATTR{queues/tx-0/byte_queue_limits/inflight}=="0"
    ATTR{queues/tx-0/byte_queue_limits/limit}=="0"
    ATTR{queues/tx-0/byte_queue_limits/limit_max}=="1879048192"
    ATTR{queues/tx-0/byte_queue_limits/limit_min}=="0"
    ATTR{queues/tx-0/tx_timeout}=="0"
    ATTR{queues/tx-0/xps_cpus}=="0"
    ATTR{statistics/collisions}=="0"
    ATTR{statistics/multicast}=="0"
    ATTR{statistics/rx_bytes}=="0"
    ATTR{statistics/rx_compressed}=="0"
    ATTR{statistics/rx_crc_errors}=="0"
    ATTR{statistics/rx_dropped}=="0"
    ATTR{statistics/rx_errors}=="0"
    ATTR{statistics/rx_fifo_errors}=="0"
    ATTR{statistics/rx_frame_errors}=="0"
    ATTR{statistics/rx_length_errors}=="0"
    ATTR{statistics/rx_missed_errors}=="0"
    ATTR{statistics/rx_over_errors}=="0"
    ATTR{statistics/rx_packets}=="0"
    ATTR{statistics/tx_aborted_errors}=="0"
    ATTR{statistics/tx_bytes}=="0"
    ATTR{statistics/tx_carrier_errors}=="0"
    ATTR{statistics/tx_compressed}=="0"
    ATTR{statistics/tx_dropped}=="0"
    ATTR{statistics/tx_errors}=="0"
    ATTR{statistics/tx_fifo_errors}=="0"
    ATTR{statistics/tx_heartbeat_errors}=="0"
    ATTR{statistics/tx_packets}=="0"
    ATTR{statistics/tx_window_errors}=="0"
    ATTR{tx_queue_len}=="1000"
    ATTR{type}=="1"

  looking at parent device '/devices/soc/gmac0':
    KERNELS=="gmac0"
    SUBSYSTEMS=="platform"
    DRIVERS=="sunxi-gmac"
    ATTRS{power/async}=="enabled"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_kids}=="0"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_enabled}=="disabled"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{power/runtime_usage}=="0"

  looking at parent device '/devices/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS==""
    ATTRS{power/async}=="disabled"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_kids}=="0"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_enabled}=="disabled"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{power/runtime_usage}=="0"

注意其中的比對鍵：KERNELS=="gmac0"

是以，分别把以上兩條鍵值添加到規則表中

KERNELS=="emac0", SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="FE0"
KERNELS=="gmac0", SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="FE1"

常用比對鍵：

    * KERNEL     - 比對裝置在核心中的命名

    * SUBSYSTEM  - 比對裝置(在sysfs中)的subsystem名

    * DRIVER     - 比對裝置對應的驅動名

    * ATTR       - 比對裝置在sysfs中屬性

    * KERNELS    - 比對裝置及其父親在核心中的命名

    * SUBSYSTEMS - 比對裝置及其父親(在sysfs中)的subsystem名

    * DRIVERS    - 比對裝置及其父親對應的驅動名

    * ATTRS      - 比對裝置及其父親在sysfs中屬性

      注：父親表示直到最上層的所有祖先

至此，兩張相同的網卡emac、gmac同時加載，通過udev規則實作了比對。

udev比對兩張網卡
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