Re: [dpdk-dev] [PATCH v7 0/8] Support vector instructions on ICE

[Thomas Monjalon <thomas@monjalon.net>]

01/04/2019 16:56, Ferruh Yigit:
> On 4/1/2019 3:39 PM, Bruce Richardson wrote:
> > On Mon, Apr 01, 2019 at 01:51:38PM +0100, Ferruh Yigit wrote:
> >> On 3/31/2019 4:52 PM, Thomas Monjalon wrote:
> >>> 26/03/2019 10:50, Ferruh Yigit:
> >>>>> Wenzhuo Lu (8):
> >>>>>   net/ice: fix Tx function setting
> >>>>>   net/ice: add pointer for queue buffer release
> >>>>>   net/ice: support vector SSE in RX
> >>>>>   net/ice: support Rx scatter SSE vector
> >>>>>   net/ice: support Tx SSE vector
> >>>>>   net/ice: support Rx AVX2 vector
> >>>>>   net/ice: support Rx scatter AVX2 vector
> >>>>>   net/ice: support vector AVX2 in TX
> >>>>
> >>>> This version (v7) pulled from next-net-intel to next-net.
> >>>
> >>> I assume these patches have been tested, or at least compiled.
> >>> However, when running devtools/test-meson-builds.sh, there is a
> >>> compilation error for build-x86-default:
> >>>
> >>> In file included from ../drivers/net/ice/ice_ethdev.h:10:
> >>> rte_ethdev_pci.h:38:10: fatal error: 'rte_pci.h' file not found
> >>
> >> I tested this with meson but not able to catch the issue. Perhaps for my case
> >> dependencies were build fast enough to cause a problem.
> > 
> > That should be a problem with the meson builds. While with make builds, the
> > headers files are picked up after they are copied to the "include"
> > directory by the build process, in meson no such copying occurs and the
> > header files are picked up by having the paths to them passed in the
> > "dependency object" to each build. If the dependency does not exist then
> > the build will never pass, irrespective of ordering, and if the dependency
> > exists, the build will always find the header in its original location.
> 
> I was checking this and recognized that no copying is happening. And I can see
> many PMDs are using this header [1], not sure why ice is failing.
> 
> > 
> > [The biggest benefit of this is that when building with ninja there are no
> > dependencies between the individual .c files - each one can be compiled
> > in parallel with all the others. It's only at the linking step that we need
> > to wait for previous jobs to complete]
> > 
> > In terms of this specific error with the header - did it get root caused?
> > Since it occurs on the "default" path, I'd suggest the fallback handling in
> > the meson.build file for the absense of AVX may be faulty, e.g. are you
> > replacing c flags or dependencies rather than appending to them?
> 
> Trying to find out the root cause, but as you said it occurs on the 'default'
> path only, and taking into account that there is not copying dependent headers,
> I am not able to find it yet, checking.

Guys! Are you kidding me?
I already described the root cause and the possible fixes:
	http://mails.dpdk.org/archives/dev/2019-March/128375.html
This is in the case AVX2 being chosen at runtime.
rte_ethdev_pci.h is included in a header file.
The dependencies object is missing static_rte_pci and static_rte_bus_pci.
I chose to just use rte_ethdev_driver.h instead.