Re: [dpdk-dev] [PATCH] librte_pmd_packet: add PMD for AF_PACKET-based virtual devices

[Neil Horman <nhorman@tuxdriver.com>]

On Tue, Jul 15, 2014 at 11:27:45PM +0200, Thomas Monjalon wrote:
> 2014-07-14 09:46, John W. Linville:
> > On Sat, Jul 12, 2014 at 12:34:46AM +0200, Thomas Monjalon wrote:
> > > 2014-07-11 13:40, John W. Linville:
> > > > Is there an example of code in DPDK that requires specific kernel
> > > > versions?  What is the preferred method for coding such dependencies?
> > > 
> > > No there is no userspace code checking kernel version in DPDK.
> > > Feel free to use what you think the best method.
> > > Please keep in mind that checking version number is a maintenance
> > > nightmare
> > > because of backports (like RedHat do ;).
> > 
Actually, I feel the need to correct this (I know you're being humorous, but
just the same).  You don't have a maintenence nightmare on your hands because
RedHat backports kernel features, you have a nightmare maintenece situation on
your hands because the DPDK uses kernel features that were never meant to be
directly accessed outside of kernel space.
Neil

> > I suppose that it could be a configuration option?
> 
> If there is no other way to configure kernel-dependent features, we can add 
> options. But I feel that relying on a macro (#ifdef) would be better if such 
> macro exist.
> 
> -- 
> Thomas
>