Re: BUG: Bisected Gianfar in bridge not forwarding packets (was:3.0-rc1 Bridge not forwarding unicast packages)
From: Michael Guntsche
Date: Wed Aug 10 2011 - 03:40:56 EST
On Wed, Aug 10, 2011 at 9:07 AM, Jiri Pirko <jpirko@xxxxxxxxxx> wrote:
> Wed, Aug 10, 2011 at 02:50:20AM CEST, mguntsche@xxxxxxxxx wrote:
>>> I just upgraded my router/bridge combo to 3.1-rc1 from 3.0 for
>>> testing. On a first look everything seemed to work fine, but when I
>>> tried to connect via openvpn to my internal network (tap0 being bridged
>>> with the internal network) I noticed that I was not able to access the
>>> server on my internal network. I could access the bridge (which is
>>> acting as the openvpn server as well) just fine though.
>>> To debug this I ran tcpdump on the openvpn client and started a ping to the
>>> internal network. I could see the ARP requests being answered.....
>>After much digging and testing I found the commit that causes the
>>problem for me here.
>>87c288c6e gianfar: do vlan cleanup
>>Before this commit my bridge works fine. I simplified the test case
>>and just tried to access the server from a local wireless device with
>>gets also bridged via
>>a gianfar nic to the wired lan. Before commit 87c288c6e I can ping the
>>device from the internal network afterwards it stops.
>>For testing purposes I reverted this commit (plus some others to make
>>the code compile) and it started working again.
>>The hardware is a routerboard with three onboard nics two of em gianfar.
>>The gianfar nics do not support any kind of offloading,
> Thanks for testing/report. I'm not sure I understand your simplified
> case :(
Sorry if my explanation was confusing but it was late night/morning
when I wrote it.
The setup is quite easy.
WLAN ----->|Bridge|<----- Wired Lan (gianfar nic)
Client (in WLAN): 192.168.42.55
Server (on Wired): 192.168.42.127
With your patch the Bridge can ping the client and the server, but the
client cannot reach the server and vice-versa.
> Anyway, gianfar supports rx/tx vlan accel. Would you please try to turn
> it on/off manually by ethtool to see if it works in some setup?
The gianfar chip in this routerboard does NOT support vlan accel it is
a TSEC model.
ethtool complains that this feature is not supported.
> I presume you have no vlans involved in your setup, right?
No, there are no vlans in my setup.
>>Is it possible that the new code is tripped up by the bridge offload
>>parameters somehow and thinks that the gianfar nic supports it as
> I don't see how now. Outside the bridge all is working correctly?
Yes I can access the server from the bridge so the network is working.
For me it looks like that the packets are just dropped when they
should go through the bridge.
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