[dpdk-dev] virtio UIO / PMD issues in default Ubuntu Cloud Images

[Matthew Hall]

Yes, I suspected some of your patches were related to this besides just the COMBINE_LIBS options. However none of these will fix the issue that the virtio non-UIO PMD doesn't work right with a statically linked DPDK, so, despite all your fixes I've still got problems getting it all to work right.

Matthew.
-- 
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On October 14, 2014 1:22:56 AM PDT, "Gonzalez Monroy, Sergio" <sergio.gonzalez.monroy at intel.com> wrote:
>
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Matthew Hall
>> Sent: Tuesday, October 14, 2014 7:34 AM
>> To: dev at dpdk.org
>> Subject: Re: [dpdk-dev] virtio UIO / PMD issues in default Ubuntu
>Cloud
>> Images
>> 
>> 
>> 
>> On Mon, Oct 13, 2014 at 11:03:53PM -0700, Matthew Hall wrote:
>> > Another weird issue... when I tried to compile a DPDK shared lib
>using
>> > clang I got this really, really weird error:
>> >
>> > /usr/bin/ld: test: hidden symbol `mknod' in
>> > /usr/lib/x86_64-linux-gnu/libc_nonshared.a(mknod.oS) is referenced
>by
>> > DSO
>> > /usr/bin/ld: final link failed: Bad value
>> 
>> Note: this specific error seems to be a bug in the behavior of DPDK
>> compilation when the following two options are enabled
>simultaneously:
>> 
>> CONFIG_RTE_BUILD_SHARED_LIB=y
>> CONFIG_RTE_BUILD_COMBINE_LIBS=y
>> 
>
>Hi Matthew,
>
>The problem as you point out is that the combined library is not being
>linked properly, 
>in this case we are not linking against libc when building the shared
>library.
>One way of fixing this issue is to use CC instead of LD to do the
>linking.
>
>I have submitted a patch that updates the lib building process which
>main purpose was
>to fix this issue but it seems that the removing of
>CONFIG_RTE_BUILD_COMBINE_LIBS
>took over its real purpose.
>Another fix that the patch fixes is linking against other external
>required libs
>(ie. libm, librt, etc) when needed, so they would show on ldd if they
>are required.
>
>Please have a look at
>http://dpdk.org/ml/archives/dev/2014-October/006453.html.
>I would expect many of your issues to be fixed with that patch and
>would really
>appreciate any feedback on it.
>
>Thanks,
>Sergio
>
>
>> I think this is a pretty serious problem for anybody that's packaging
>or
>> distributing a complete DPDK because compiling both the static and
>dynamic
>> DPDK's at the same time as one another is going to fail with this
>weird error.
>> 
>> Matthew.