[dpdk-dev] Overriding rte_config.h

[Bruce Richardson]

On Fri, Oct 29, 2021 at 09:48:30AM -0400, Ben Magistro wrote:
> With the transition to meson, what is the best way to provide custom values
> to parameters in rte_config.h?  When using makefiles, (from memory, I
> think) we used common_base as a template that was copied in as a
> replacement for defconfig_x86....  Our current thinking is to apply a
> locally maintained patch so that we can track custom values easier to the
> rte_config.h file unless there is another way to pass in an overridden
> value.  As an example, one of the values we are customizing is
> IP_FRAG_MAX_FRAG.
> 
> Cheers,
> 
There is no one defined way for overriding values in rte_config with the
meson build system, as values there are ones that should rarely need to be
overridden. If it's the case that one does need tuning, we generally want
to look to either change the default so it works for everyone, or
alternatively look to replace it with a runtime option.

In the absense of that, a locally maintained patch may be reasonable. To
what value do you want to change MAX_FRAG? Would it be worth considering as
a newer default value in DPDK itself, since the current default is fairly
low?