[dpdk-dev] [PATCH v2 0/2] dpdk: Allow for dynamic enablement of some isolated features

[Neil Horman <nhorman@tuxdriver.com>]

Hey all-
        I've been trying to update the fedora dpdk package to support VFIO
enabled drivers and ran into a problem in which ixgbe didn't compile because the
rxtx_vec code uses sse4.2 instruction intrinsics, which aren't supported in the
default config I have.  I tried to remedy this by replacing the intrinsics with
the __builtin macros, but it was pointed out (correctly), that this doesn't work
properly.  So this is my second attempt, which I actually like a bit better.  I
noted that code that uses intrinsics (ixgbe and the acl library), don't need to
have those instructions turned on build-wide.  Rather, we can just enable the
instructions in the specific code we want to build with support for that, and
test for instruction support dynamically at run time.  This allows me to build
the dpdk for a generic platform, but in such a way that some optimizations can
be used if the executing cpu supports them at run time.

Change notes:

v2)
	* Added Log messages to run time check failures per Konstantin
	* Removed run time check caching in acl per Konstantin

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Thomas Monjalon <thomas.monjalon@6wind.com>