[dpdk-dev] Debugging EAL PCI / Driver Init

Matthew Hall mhall at mhcomputing.net
Sun Aug 3 23:39:03 CEST 2014

Yes, that's the one! It made a lot of my linking problems go away when I used that along with the whole-archive flags.

Sent from my mobile device.

On August 3, 2014 11:13:55 AM PDT, "Jayakumar, Muthurajan" <muthurajan.jayakumar at intel.com> wrote:
>Are you referring to CONFIG_RTE_BUILD_COMBINE_LIBS ? 
>(ps: referenced here
>M Jay
>-----Original Message-----
>From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Matthew Hall
>Sent: Sunday, August 03, 2014 10:23 AM
>To: Alex Markuze
>Cc: dev at dpdk.org
>Subject: Re: [dpdk-dev] Debugging EAL PCI / Driver Init
>There is an option in the DPDK build config which compiles every DPDK
>lib into a single static lib. I don't have the name of the option in
>front of me but it had COMBINE in its name. When this option is used
>you can get every function in the whole DPDK with a single library.
>After that I had a lot fewer linking issues.
>Sent from my mobile device.
>On August 3, 2014 4:41:51 AM PDT, Alex Markuze <alex at weka.io> wrote:
>>Resolved just as Matt has described.
>>To remove any ambiguity (for future reference).
>>This line in the gcc command resolves the issue in my case (a
>>nic may need a different lib):
>>--whole-archive -Wl,--start-group -lrte_pmd_ixgbe -Wl,--end-group -Wl,
>>The problem is that the probe command polls over all pci devices and 
>>tries to find a matching driver, these drivers register With these 
>>macros which will only be called when the --whole-archive option is 
>>provided and its actually the reason for this flags existence. Without
>>this flag the driver list is empty.
>>On Sun, Aug 3, 2014 at 1:38 PM, Alex Markuze <alex at weka.io> wrote:
>>> Hi Matt, Dev
>>> I'm Trying to compile ann app linking to dpdk and dpdk based libs.
>>> And I'm seeing the same issue you've reported.
>>> The probe function doesn't seem to find any ixgbevf(SRIOV VM) ports.
>>> Same code compiled as a dpdk app works fine.
>>> In your solution to this issue you are referring to  -lintel_dpdk? I
>>> couldn't find any reference to it.
>>> Thanks
>>> Alex.
>>> On Sat, Aug 2, 2014 at 7:46 PM, Matthew Hall <mhall at mhcomputing.net>
>>>> On Sun, Aug 03, 2014 at 01:37:06AM +0900, Masaru Oki wrote:
>>>>> cc links library funtion from archive only if call from other
>>>>> but new dpdk pmd library has constractor section and not call
>>>>> ld always links library funtion with constractor section.
>>>>> use -Xlinker, or use ld instead of cc.
>>>> Hello Oki-san,
>>>> The trick to fix it was this, I finally found it in the example
>>Makefiles with
>>>> V=1 flag.
>>>> -Wl,--whole-archive -Wl,--start-group -lintel_dpdk -Wl,--end-group
>>>> Thank you for the advice you provided, I couldn't have fixed it
>>without your
>>>> suggestions... it got me to look more closely at the linking.
>>>> "-Wl,--whole-archive" includes the entire archive whether or not
>>it's called
>>>> from other objects, so we don't lose the constructors, just like
>>>> Matthew.

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