Re: [dpdk-dev] Debugging EAL PCI / Driver Init

[Alex Markuze <alex@weka.io>]

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
different 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.

PMD_REGISTER_DRIVER(rte_ixgbe_driver);
PMD_REGISTER_DRIVER(rte_ixgbevf_driver);


On Sun, Aug 3, 2014 at 1:38 PM, Alex Markuze <alex@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@mhcomputing.net> wrote:
>> On Sun, Aug 03, 2014 at 01:37:06AM +0900, Masaru Oki wrote:
>>> cc links library funtion from archive only if call from other object.
>>> but new dpdk pmd library has constractor section and not call directly.
>>> 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 -Wl,--no-whole-archive
>>
>> 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. Importantly,
>> "-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 you said.
>>
>> Matthew.