On 8/29/06, Peter Ennis <[EMAIL PROTECTED]> wrote:
LFS 6.2
Capitalization Issue:
=====================
7.13.1. Creating stable names for network interfaces
^ ^ ^ ^
Thanks.
Udev Stuff:
===========
Reading section 7.13.1 it mentions
"If you are going to use the bus position as a key, create Udev rules
similar to the following"
however, there is no information provided on how to get the
bus position (1) or why you would want to (3). Some googling
and info from gregkh (2) provided answers.
For the previous section a command is provided to get MAC info.
The useful commands are lspci and scanpci. An example
output from my system below shows how this maps to the info
needed for section 7.13.1
The problem is that these aren't guarenteed to be there on the host
and we don't build them in LFS. But, you can get the same info from
sysfs. I couldn't figure a really slick way to do this. Maybe
Alexander knows better. Here's one way to do it.
$ ls -l /sys/class/net/*/device
lrwxrwxrwx 1 root root 0 2006-08-29 06:50 /sys/class/net/eth0/device
-> ../../../devices/pci0000:00/0000:00:0f.0
I've only got one network device. It's the eth0 device. It's on the
pci bus and it's bus address is 0000:00:0f.0.
Another thing to do is ask udevinfo about a specific device path. The
only problem with this is that you have to know the existing interface
name. The bus address is the ID of the parent device.
$ udevinfo -a -p /class/net/eth0
Udevinfo 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 '/class/net/eth0':
KERNEL=="eth0"
SUBSYSTEM=="net"
SYSFS{weight}=="0"
SYSFS{tx_queue_len}=="1000"
SYSFS{flags}=="0x1023"
SYSFS{mtu}=="1500"
SYSFS{operstate}=="unknown"
SYSFS{dormant}=="0"
SYSFS{carrier}=="1"
SYSFS{broadcast}=="ff:ff:ff:ff:ff:ff"
SYSFS{address}=="00:05:5d:e5:ae:08"
SYSFS{link_mode}=="0"
SYSFS{type}=="1"
SYSFS{features}=="0x0"
SYSFS{ifindex}=="2"
SYSFS{iflink}=="2"
SYSFS{addr_len}=="6"
looking at parent device '/devices/pci0000:00/0000:00:0f.0':
ID=="0000:00:0f.0"
BUS=="pci"
DRIVER=="sundance"
SYSFS{modalias}=="pci:v00001186d00001002sv00001186sd00001002bc02sc00i00"
SYSFS{local_cpus}=="1"
SYSFS{irq}=="10"
SYSFS{class}=="0x020000"
SYSFS{subsystem_device}=="0x1002"
SYSFS{subsystem_vendor}=="0x1186"
SYSFS{device}=="0x1002"
SYSFS{vendor}=="0x1186"
looking at parent device '/devices/pci0000:00':
ID=="pci0000:00"
BUS==""
DRIVER==""
What do you think, Peter?
--
Dan
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