NWR04B: Turning to the switch
01 Jan 2006I'm not making much headway erasing flash, so I'm taking a bit of a break from that by turning my attention to the network interfaces.
There are five ethernet interfaces on the NWR04B, plus the wireless card. Only one of the ethernet interfaces comes up enabled in Linux, so I've been trying to track down how it's all initialized and how to change it. The problem is, once again, that I really don't know what I'm doing, and I'm having to teach myself as I go along.
For example: the driver and the datasheet for the CPU talk about the CPU port for the switch. What the hell is that? Originally I thought that might be a special ethernet interface -- you know, like the one that's enabled in Linux. But this info says no, it's essentially a logical interface that may or may not be connected to a particular ethernet interface.
Yeah, the info is for the ADM5120 switch (which in turn is based on a MIPS chip) "a/o/t the ADM5106 (which is ARM-based) I'm working with, but I think the principal should be the same. It certainly seems to match the sort of stuff I'm seeing in the driver code. I'm hopeful, too, that the configuration tool for the 5120 will be, broadly speaking, applicable to the 5106...they talk about ioctls in the driver being used for this sort of thing; not sure if they're in the 5106 driver (I suspect not), but the source code available for 5120-based routers might have enough info to let me cut-and-paste^Wport something over.
Update: So the config tool for the 5120 uses a couple ioctls,
SIOCSMATRIX
and SIOCGMATRIX
, to control which interfaces are on
which VLAN. SIOCSMATRIX
is defined in the config tool's code as
SIOCDEVPRIVATE
, and that has to be defined by the driver. It
wasn't there in the source code, but a quick search for
SIOCSMATRIX turned up a few diffs against the main
kernel tree for the 5120. Looks like the switch driver may be a bit
more full-featured than what I've currently got for the 5106, and I
think it may be more or less a simple cut-n-paste to get it working
for the NWR04B. Here's hoping.
1 Comment
From: Vlad
20-January-2006-01:20:47
On 2.4.31/32 there are bitmask of connected logican interfaces:
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