Re: Troubleshooting DPDK in Intel Ethernet NIC

[David Marchand <david.marchand@redhat.com>]

Hello,

On Fri, Sep 8, 2023 at 8:42 AM Antón Rey Villaverde
<anton.rey@cactussoft.biz> wrote:
>
> Hi,
> I have a problem while trying to manage my physical Ethernet interface from DPDK (latest version compiled from source).
> I have a:
> NIC: 0000:00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (13) I219-LM (rev 20)
>
> which belongs to the list of supported NICs in DPDK.
>
> Also, I have bound my NICto vfio-pci, not the kernel:
>
> dpdk-23.07$ usertools/dpdk-devbind.py --status
> Network devices using DPDK-compatible driver ============================================ 0000:00:1f.6 'Ethernet Connection (13) I219-LM 15fb' drv=vfio-pci unused=e1000e
>
> I also enabled hugepages (2G).
>
> when I enter "sudo build/app/dpdk-testpmd -c7 -- -i" I get:
> EAL: Detected CPU lcores: 8
> EAL: Detected NUMA nodes: 1
> EAL: Detected static linkage of DPDK
> EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
> EAL: Selected IOVA mode 'VA'
> EAL: VFIO support initialized
> TELEMETRY: No legacy callbacks, legacy socket not created
> testpmd: No probed ethernet devices
> Interactive-mode selected
> testpmd: create a new mbuf pool <mb_pool_0>: n=163456, size=2176, socket=0
> testpmd: preferred mempool ops selected: ring_mp_mc
> Done
> testpmd>
>
> When I enter "show port info all" in the testpmd CLI I get nothing (no ports).
>
> When I start testpmd with "-a 0000:00:1f.6" (the address of the ethernet NIC I want to manage from DPDK), The same happens (no ports).

Afaics, this nic is not supported by DPDK drivers.
You will have to find some other nic, or run on another server with
supported nics.
Some details below.


For a statically linked DPDK application (which is the default for
testpmd), you can check with dpdk-pmd-info.py which PCI devices are
supported.
Example:
$ ./usertools/dpdk-pmdinfo.py build/app/dpdk-testpmd | grep -i 15fb


>
> If I try to start testpmd with "-d build/drivers/librte_net_e1000.so" (the shared library of the driver of that device), I get a crash:
>
> dpdk-23.07$ sudo build/app/dpdk-testpmd -c7 -a 0000:00:1f.6 -d build/drivers/librte_net_e1000.so -- -i
> EAL: Detected CPU lcores: 8
> EAL: Detected NUMA nodes: 1
> EAL: Detected static linkage of DPDK

Your testpmd binary has been statically linked (as I said above, this
is the default) and you can see the log message confirming it.


> EAL: UIO_RESOURCE_LIST tailq is already registered PANIC in tailqinitfn_rte_uio_tailq(): Cannot initialize tailq: UIO_RESOURCE_LIST
> 0: build/app/dpdk-testpmd (rte_dump_stack+0x32) [55be1839afe2]
> 1: build/app/dpdk-testpmd (__rte_panic+0xf1) [55be18369e68]
> 2: /home/anton/tdr/dpdk-23.07/build/drivers/librte_bus_pci.so.23 (7f52153f6000+0x5d86) [7f52153fbd86]
> 3: /lib64/ld-linux-x86-64.so.2 (7f5215f90000+0x11b9a) [7f5215fa1b9a]
> 4: /lib64/ld-linux-x86-64.so.2 (7f5215f90000+0x11ca1) [7f5215fa1ca1]
> 5: /lib/x86_64-linux-gnu/libc.so.6 (_dl_catch_exception+0xe5) [7f5215970985]
> 6: /lib64/ld-linux-x86-64.so.2 (7f5215f90000+0x160cf) [7f5215fa60cf]
> 7: /lib/x86_64-linux-gnu/libc.so.6 (_dl_catch_exception+0x88) [7f5215970928]
> 8: /lib64/ld-linux-x86-64.so.2 (7f5215f90000+0x1560a) [7f5215fa560a]
> 9: /lib/x86_64-linux-gnu/libdl.so.2 (7f5215e15000+0x134c) [7f5215e1634c]
> 10: /lib/x86_64-linux-gnu/libc.so.6 (_dl_catch_exception+0x88) [7f5215970928]
> 11: /lib/x86_64-linux-gnu/libc.so.6 (_dl_catch_error+0x33) [7f52159709f3]
> 12: /lib/x86_64-linux-gnu/libdl.so.2 (7f5215e15000+0x1b59) [7f5215e16b59]
> 13: /lib/x86_64-linux-gnu/libdl.so.2 (dlopen+0x4a) [7f5215e163da]
> 14: build/app/dpdk-testpmd (55be17b79000+0x8013ee) [55be1837a3ee]
> 15: build/app/dpdk-testpmd (eal_plugins_init+0x14f) [55be1837a6d8]
> 16: build/app/dpdk-testpmd (rte_eal_init+0x1af) [55be1839ec21]
> 17: build/app/dpdk-testpmd (main+0xde) [55be17da108b]
> 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [7f5215834083]
> 19: build/app/dpdk-testpmd (_start+0x2e) [55be17cef1fe]
> Aborted

This is not a crash, EAL willingly aborts because initialising UIO
shared tailq has been requested twice and this is not something
supported.
This happened as you requested to load a driver that is embedded in
the testpmd binary and has already been initialised.


-- 
David Marchand