question about vlan driver
Hello,
I have a short question about vlan driver;
I see in the vlan driver the following code when creating a new vlan interface:
vlan_newlink() {
...
if (data[IFLA_VLAN_PROTOCOL])
proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
else
proto = htons(ETH_P_8021Q);
...
}
see:
http://lxr.free-electrons.com/source/net/8021q/vlan_netlink.c#L105
I understand that in the common case, proto is ETH_P_8021Q.
How can it be set to a different value when creating a vlan interface ?
And to which other values can it be set ?
I did not find anything by vconfig --help, and also by probing into
the userspace code of the vconfig tool.
any ideas?
Regards,
Kevin
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Re: question about vlan driver
Kevin Wilson wkev...@gmail.com writes:
Hello,
I have a short question about vlan driver;
I see in the vlan driver the following code when creating a new vlan
interface:
vlan_newlink() {
...
if (data[IFLA_VLAN_PROTOCOL])
proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
else
proto = htons(ETH_P_8021Q);
...
}
see:
http://lxr.free-electrons.com/source/net/8021q/vlan_netlink.c#L105
I understand that in the common case, proto is ETH_P_8021Q.
How can it be set to a different value when creating a vlan interface ?
And to which other values can it be set ?
I did not find anything by vconfig --help, and also by probing into
the userspace code of the vconfig tool.
That code is pretty new, so you won't find many examples on how to use
it. But the commit message includes an example:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/net/8021q/vlan_netlink.c?id=8ad227ff89a7e6f05d07cd0acfd95ed3a24450ca
You'll naturally need a pretty recent version of iproute2 as well.
Actually, the matching userspace code doesn't seem to be in
http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git just
yet. So you'd need a not-yet-there version of iproute2 :)
The iproute2 patch was submitted at the same time as the kernel patch:
http://www.spinics.net/lists/netdev/msg233587.html
Bjørn
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Re: question about vlan driver
Hi, Bjorn
Thanks a lot for your quick answer. This explains all !
It seems as though there was only one line from this patch was
applied, since in the latest git of iproute I see:
in include/linux/if_link.h:IFLA_VLAN_PROTOCOL
which was added in this patch you mentioned
http://www.spinics.net/lists/netdev/msg233587.html
but nothing else
It is probably a matter of sync between iproute version and kernel version
rgs
Kevin
On Mon, May 6, 2013 at 9:26 PM, Bjørn Mork bj...@mork.no wrote:
Kevin Wilson wkev...@gmail.com writes:
Hello,
I have a short question about vlan driver;
I see in the vlan driver the following code when creating a new vlan
interface:
vlan_newlink() {
...
if (data[IFLA_VLAN_PROTOCOL])
proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
else
proto = htons(ETH_P_8021Q);
...
}
see:
http://lxr.free-electrons.com/source/net/8021q/vlan_netlink.c#L105
I understand that in the common case, proto is ETH_P_8021Q.
How can it be set to a different value when creating a vlan interface ?
And to which other values can it be set ?
I did not find anything by vconfig --help, and also by probing into
the userspace code of the vconfig tool.
That code is pretty new, so you won't find many examples on how to use
it. But the commit message includes an example:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/net/8021q/vlan_netlink.c?id=8ad227ff89a7e6f05d07cd0acfd95ed3a24450ca
You'll naturally need a pretty recent version of iproute2 as well.
Actually, the matching userspace code doesn't seem to be in
http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git just
yet. So you'd need a not-yet-there version of iproute2 :)
The iproute2 patch was submitted at the same time as the kernel patch:
http://www.spinics.net/lists/netdev/msg233587.html
Bjørn
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