SocketCAN version numbering

SocketCAN version numbering

[Heinz-Jürgen Oertel]

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Hello,

What is the suggested way to get the SocketCAN version number?
On my two systems, according to Documentation/networking/can.txt, I always get 

 $ cat /proc/net/can/version
 rev 20090105 abi 8

on different systems.
But one has support for error counters the other not with the same interface board

Regards
    Heinz

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Re: SocketCAN version numbering

[Oliver Hartkopp]

On 27.04.2012 11:25, Heinz-Jürgen Oertel wrote:

> What is the suggested way to get the SocketCAN version number?
> On my two systems, according to Documentation/networking/can.txt, I always get
>
>   $ cat /proc/net/can/version
>   rev 20090105 abi 8
>
> on different systems.
> But one has support for error counters the other not with the same interface board

Hello Heinz,

the version number is intended for the network layer stuff located in
linux/net/can and not for the CAN drivers.

Generally the version number is obsolete as it is part of the Kernel and
therefore e.g. the ABI for applications has to be stable and backwards
compatible.

Btw. i think when adding support for CAN FD we should indicate that with a
new version number and ABI version 9.

When there are new functionalities that are implemented in a specific Kernel
version, you may use the uname() function to retrieve the Kernel version.

http://www.kernel.org/doc/man-pages/online/pages/man2/uname.2.html

Or check if a new function is known or not.

Regards,
Oliver

Re: SocketCAN version numbering

[Wolfgang Grandegger]

Hello Heinz,

On 04/27/2012 11:25 AM, Heinz-Jürgen Oertel wrote:
> 
> Hello,
> 
> What is the suggested way to get the SocketCAN version number?
> On my two systems, according to Documentation/networking/can.txt, I always get 
> 
>  $ cat /proc/net/can/version
>  rev 20090105 abi 8

This is for the CAN protocol implementation but I'm not sure if it's
well maintained...

> on different systems.
> But one has support for error counters the other not with the same interface board

... and for CAN drives we do not maintain extra version number. Usually,
the kernel version is used to understand if a feature exists or is
supported. For the bus error counter and such features, capability flags
would be a nice to have, though Anyway, what would you like to use the
berr_counters for? If they are not available, a netlink request will
return an error.

Wolfgang.