The day before yesterday I found that renaming a network
device under 2.5 doesn't update sysfs. While trying to
figure this out I've found that there's another stuff that
don't get updated with the new name: sysctl.
My system renames one of my cards to ethlan on boot. Later I
manually renamed it to another name. Here are the 3 different names
that the kernel see for the same network device.
ifconfig, sees the right name (ethlanX):
[root@callisto ~]# ifconfig ethlanX
ethlanX Link encap:Ethernet HWaddr 00:80:AD:00:DB:BC
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:2225 errors:0 dropped:0 overruns:0 frame:0
TX packets:2984 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:472674 (461.5 KiB) TX bytes:2466241 (2.3 MiB)
Interrupt:5 Base address:0xb000
sysfs, sees the name of the device at module load time (eth0 or eth1):
[root@callisto ~]# ls -l /sys/class/net
total 0
drwxr-xr-x 3 root root 0 Jun 29 20:41 eth0
drwxr-xr-x 3 root root 0 Jun 29 20:41 eth1
drwxr-xr-x 3 root root 0 Jun 29 20:41 lo
drwxr-xr-x 3 root root 0 Jun 29 20:41 ppp0
sysctl, sees the name of the device at some point in time
when the directory was instantiated by the user (ethlan):
[root@callisto ~]# ls -l /proc/sys/net/ipv4/conf
total 0
dr-xr-xr-x 2 root root 0 Jun 29 21:20 all
dr-xr-xr-x 2 root root 0 Jun 29 21:20 default
dr-xr-xr-x 2 root root 0 Jun 29 21:20 ethinet
dr-xr-xr-x 2 root root 0 Jun 29 21:20 ethlan
dr-xr-xr-x 2 root root 0 Jun 29 21:20 lo
dr-xr-xr-x 2 root root 0 Jun 29 21:20 ppp0
Note that this is also affects sysctl(2), as it uses /proc:
[root@callisto /home/karrde]# sysctl -a | grep ethlan.tag
net.ipv4.conf.ethlan.tag = 0
I think this should be fixed before 2.6. I'm starting to figure out
about sysfs, but I have no idea how to fix the sysctl part at the
moment.
-- Dan Aloni da-x@gmx.net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Jun 30 2003 - 22:00:31 EST