Re: loopback/recv own messages option not working as expected with plx_pci (Adlink Technology PCI-7841)

[Oliver Hartkopp <socketcan@hartkopp.net>]

Hi Felix,

On 12.01.2012 14:53, Felix Obenhuber wrote:


> I just encountered a problem with the loopback and receive own
> messages option in combination with the plx_pci driver serving a
> Adlink PCI-7841. It driver behaves a the CAN_RAW_RECV_OWN_MSGS and
> LOOPBACK option would have been set (and they aren't).
> 
> One box with the Adlink card connected to another host with a approved
> and well initialized CAN card. Sending single frames from each hosts
> works fine. When I start the canecho test from trunk/test and send a
> frame on  the bus (from the other node) its duplicated each time
> canecho reads/writes the frame. You would get the same result if you
> set the CAN_RAW_RECV_OWN_MSGS and LOOPBACK option on the socket in the
> canecho test.
> I have the same behavior with a tool written by me and tested with the
> latest trunk revision - same result.
> Running canecho on a vcan or peak usb device works as expected.


Both vcan & the PEAK driver use a fallback solution for that - so it is not a
real statement when they work.

> 
> Has someone seen something similar with that driver? I'd just like to
> ask before digging into it.


No - i assume you are using a 2.6.30.x (0 <= x < 5) kernel, right?

See

http://old.nabble.com/Local-loopback-broken--td24108048.html

Regards,
Oliver