[dpdk-dev] [Bug 652] Link detection failing when DPDK takes control of XXV710 NIC

[dpdk-dev] [Bug 652] Link detection failing when DPDK takes control of XXV710 NIC

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=652

            Bug ID: 652
           Summary: Link detection failing when DPDK takes control of
                    XXV710 NIC
           Product: DPDK
           Version: 18.05
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: hajim@juniper.net
  Target Milestone: ---

DPDK version: 
 17.x, 18.x, 19.x
OS: RHSOP13
Compiler: gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
Hardware platform: Intel(R) Xeon(R) Gold 6238R CPU @ 2.20GHz 
NIC hardware: Fortville NIC - XXV710
NIC firmware: 
Test Setup
Steps to reproduce


# when DPDK takes control of XXV710 NIC(vfio-pci - i40e), Link detection is
failing on compute side and switch side. we tried to bind back to kernel
driver, still link is not detecting.Reboot is the only way to recover from this
state.
# once system is rebooted, the link stays UP for few seconds and it goes down.
Rebooting DPDK process doesn't have any effect.
# We tried testing using DPDK-testpmd stock binaries of 17.02, 18.05 & 19.11.6,
the behaviour is consistent.

Additional Logs:
cat lscpu.txt 
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                112
On-line CPU(s) list:   0-111
Thread(s) per core:    2
Core(s) per socket:    28
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 85
Model name:            Intel(R) Xeon(R) Gold 6238R CPU @ 2.20GHz
Stepping:              7
CPU MHz:               2201.000
CPU max MHz:           2201.0000
CPU min MHz:           1000.0000
BogoMIPS:              4400.00
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              1024K
L3 cache:              39424K
NUMA node0 CPU(s):     0-27,56-83
NUMA node1 CPU(s):     28-55,84-111
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl
vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic
movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm
3dnowprefetch epb cat_l3 cdp_l3 invpcid_single intel_ppin intel_pt ssbd mba
ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid fsgsbase
tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f
avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt
xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida
arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke avx512_vnni
md_clear spec_ctrl intel_stibp flush_l1d arch_capabilities

CPU_LIST=2-15
DPDK_COMMAND_ADDITIONAL_ARGS="--vr_mempool_sz 262144 --dpdk_txd_sz 2048
--dpdk_rxd_sz 2048"

$ cat cmdline.txt 
BOOT_IMAGE=/boot/vmlinuz-3.10.0-1127.19.1.el7.x86_64
root=UUID=8aeeff73-a636-4e5f-a120-dec2269aa892 ro console=tty0
console=ttyS0,115200n8 crashkernel=auto rhgb quiet default_hugepagesz=1G
hugepagesz=1G hugepages=344 hugepagesz=2M hugepages=80
isolcpus=1-27,30-55,57-83,86-111 intel_iommu=on iommu=pt skew_tick=1 nohz=on
nohz_full=1-27,30-55,57-83,86-111 rcu_nocbs=1-27,30-55,57-83,86-111
tuned.non_isolcpus=00300000,01000000,30000001 intel_pstate=disable nosoftlockup

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