Re: Debugging EAL PCI / Driver Init

I did a bit more experimentation and found the following. If I unmark the 
rte_igb_pmd_init function as static, and call it directly from my code, the 
driver will load, and the port count increments to 2:

EAL: PCI device 0000:01:00.0 on NUMA socket -1
EAL:   probe driver: 8086:1521 rte_igb_pmd
EAL:   PCI memory mapped at 0x7f09d45f2000
EAL:   PCI memory mapped at 0x7f09d4730000
PMD: eth_igb_dev_init(): port_id 0 vendorID=0x8086 deviceID=0x1521

EAL: PCI device 0000:01:00.1 on NUMA socket -1
EAL:   probe driver: 8086:1521 rte_igb_pmd
EAL:   PCI memory mapped at 0x7f09d0f00000
EAL:   PCI memory mapped at 0x7f09d472c000
PMD: eth_igb_dev_init(): port_id 1 vendorID=0x8086 deviceID=0x1521

So it seems like when you enable these options:

# Combine to one single library
CONFIG_RTE_BUILD_COMBINE_LIBS=y
CONFIG_RTE_LIBNAME="intel_dpdk"

You don't really get a working DPDK inside of "-lintel_dpdk". Someone 
suggested linking with "-Xlinker -lintel_dpdk" but that didn't seem to help.

Is there a secret to getting a single integrated static library, where all of 
the PMD's end up in the PCI driver list so rte_eal_pci_probe can find them? Or 
some secret to linking against the combined library which works properly?

Matthew.

On Fri, Aug 01, 2014 at 10:51:38AM -0700, Matthew Hall wrote:

Hello,

I am running into a problem where Eth driver init works fine in a sample app 
and finds my NICs, and the NICs appear in rte_eal_pci_dump(stdout) but they 
don't show up in rte_eth_dev_count() even after rte_eal_pci_probe() is called 
the same as the sample apps, so my app won't boot.

I have a lot of experience using the older versions of the DPDK where you had 
to call the PMD init functions manually but no experience with the later 
versions where the DPDK is supposed to init the PMDs itself automatically.

What do I have to do to dump the most possible debug output on why the driver 
list for my PCI devices always seems empty? Any places I should look to see 
the issue? Maybe I didn't link it together with the right DPDK libs? I used 
the combined DPDK static lib libintel_dpdk.a to make things simpler as I had 
seen recommended in various places.

Thanks,
Matthew.