Re: [dpdk-dev] [PATCH v11 6/9] net/virtio: add vectorized packed ring Rx path

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, Apr 30, 2020 at 10:48:35AM +0100, Ferruh Yigit wrote:
> On 4/28/2020 9:32 AM, Marvin Liu wrote:
> > Optimize packed ring Rx path with SIMD instructions. Solution of
> > optimization is pretty like vhost, is that split path into batch and
> > single functions. Batch function is further optimized by AVX512
> > instructions. Also pad desc extra structure to 16 bytes aligned, thus
> > four elements will be saved in one batch.
> > 
> > Signed-off-by: Marvin Liu <yong.liu@intel.com>
> > Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> 
> <...>
> 
> > @@ -9,6 +9,20 @@ sources += files('virtio_ethdev.c',
> >  deps += ['kvargs', 'bus_pci']
> >  
> >  if arch_subdir == 'x86'
> > +	if '-mno-avx512f' not in machine_args
> > +		if cc.has_argument('-mavx512f') and cc.has_argument('-mavx512vl') and cc.has_argument('-mavx512bw')
> > +			cflags += ['-mavx512f', '-mavx512bw', '-mavx512vl']
> > +			cflags += ['-DCC_AVX512_SUPPORT']
> > +			if (toolchain == 'gcc' and cc.version().version_compare('>=8.3.0'))
> > +				cflags += '-DVHOST_GCC_UNROLL_PRAGMA'
> > +			elif (toolchain == 'clang' and cc.version().version_compare('>=3.7.0'))
> > +				cflags += '-DVHOST_CLANG_UNROLL_PRAGMA'
> > +			elif (toolchain == 'icc' and cc.version().version_compare('>=16.0.0'))
> > +				cflags += '-DVHOST_ICC_UNROLL_PRAGMA'
> > +			endif
> > +			sources += files('virtio_rxtx_packed_avx.c')
> > +		endif
> > +	endif
> 
> This is giving following error in Travis build [1], it is seems this usage is
> supported since meson 0.49 [2] and Travis has 0.47 [3], also DPDK supports
> version 0.47.1+ [4].
> 
> Can you please check for meson v0.47 version way of doing same thing?
> 
> 
<arrayname>.contains() is probably what you want.

/Bruce