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

[Neil Horman]

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.

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