Re: Check if interface supports Device Polling
- From: Jeremy Chadwick <koitsu@xxxxxxxxxxx>
- Date: Wed, 22 Oct 2008 08:24:07 -0700
On Wed, Oct 22, 2008 at 08:12:28AM -0700, Jeremy Chadwick wrote:
# ifconfig -v rl0 caps
Capabilities: 48
The above patch is completely unnecessary. The -m flag in ifconfig
will do what you want.
However, the existing ifconfig code does not print POLLING as a
capability, which is where the bug truly lies.
I'll provide a patch that extends the capability list properly, and will
allow you to determine a full capability list.
I'm both correct and incorrect.
Correct: ifconfig -m will show you want. No need for the patch.
Incorrect: I missed the "POLLING" part of #define IFCAPBITS in
ifconfig.c -- it is in fact listed there.
Maybe the polling bit is only made available if you've built a kernel
with "option DEVICE_POLLING"? For example, I can do "ifconfig em1
polling", which returns no error, but "ifconfig -m em1" does not show
POLLING. (My kernel does NOT have DEVICE_POLLING defined.)
In your above output, capabilities is 0x48, which means POLLING is
available, and VLAN_MTU is available. You did not provide us output of
"ifconfig -m rl0", but I'd be inclined to believe "POLLING" is shown
there... I hope. :-)
Also, it appears ifconfig does not print TOE4 or TOE6 capability bits;
that's probably a missing feature.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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