examples/bridge to pass from stack to nic does not work on e1000e

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What steps will reproduce the problem?
1. clone repo and checkout commit e0aaedfadb...
2. compile and insert modules
3. compile examples/bridge
4. sudo ./bridge -i eth0

What is the expected output? What do you see instead?
Packets are not passed between the host stack and the interface. I used gdb and 
I could see that nm_ring_space(txring) - in this case the hw ring - always 
returns 0.


What version of the product are you using? On what operating system?
Ubuntu 12.04.3 LTS, kernel 3.5.0-43-generic. I updated to latest but the 
problem can be seen starting from the commit indicate above. My machine is a HP 
ProBook 6560b, intel i3-2350M and an e1000e NIC.


Please provide any additional information below.

Original issue reported on code.google.com by ciprian....@linaro.org on 21 Jan 2014 at 6:02

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Original comment by giuseppe.lettieri73 on 26 Feb 2014 at 9:30

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Original comment by giuseppe.lettieri73 on 26 Feb 2014 at 9:35

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[GoogleCodeExporter]

We reproduced your problem, trying to ping a remote machine, where the 
destination IP is reached through eth0.
In our experiment ping works for a while (say 15 packets) and then packets stop 
being passed between the host stack and interface.

After this fix 

     http://code.google.com/p/netmap/source/detail?r=bc3eb738c89a84c5b4db2855a541e0428377d79d

the problem disappeared for us.

Original comment by v.maffi...@gmail.com on 27 Feb 2014 at 8:10

• Changed state: Fixed
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[samiruor]

Hi,

Facing the same issue for e1000 on git head: add1e50
Only ~49 packets are transferred, then bridge application hangs with timeouts prints. Also I observed that if I keep the application running, after sometime another burst of 49 packets are transferred followed by timeouts.

Note: I am running the example inside a virtual machine.

Thanks,
Samir