RE: VF is still resetting

["Xing, Beilei" <beilei.xing@intel.com>]

Hi Steve,

Could you please help on this? Thanks.

BR,
Beilei

> -----Original Message-----
> From: Nobin Mathew <nobin.mathew@gmail.com>
> Sent: Wednesday, July 20, 2022 12:18 AM
> To: users@dpdk.org
> Subject: VF is still resetting
> 
> Hi,
> 
> We are running a dpdk app inside a pod, and orchestrating the app very
> frequently(test app).
> 
> 1/100 or so we are getting an error:
> 
> 2022-07-17T22:34:24.620291289+03:00 iavf_check_vf_reset_done(): reset
> VFR value: 3
> 2022-07-17T22:34:24.620310455+03:00 iavf_init_vf(): VF is still resetting
> 2022-07-17T22:34:24.620339697+03:00 iavf_dev_init(): Init vf failed
> 2022-07-17T22:34:24.620390802+03:00 EAL: Releasing PCI mapped resource
> for 0000:3b:0f.5
> 2022-07-17T22:34:24.620397381+03:00 EAL: Calling pci_unmap_resource for
> 0000:3b:0f.5 at 0x2101000000
> 2022-07-17T22:34:24.620442514+03:00 EAL: Calling pci_unmap_resource for
> 0000:3b:0f.5 at 0x2101010000
> 2022-07-17T22:34:24.729012277+03:00 EAL: Requested device 0000:3b:0f.5
> cannot be used
> 2022-07-17T22:34:24.729028758+03:00 EAL: Bus (pci) probe failed.
> 
> we added one log in dpdk lib to print the VFGEN_RSTAT register of the VF. In
> problematic cases, we are seeing the value 3 which maps to 0xDEADBEEF
> 
> / VF reset states - these are written into the RSTAT register:
> * VFGEN_RSTAT on the VF
> * When the PF initiates a reset, it writes 0
> * When the reset is complete, it writes 1
> * When the PF detects that the VF has recovered, it writes 2
> * VF checks this register periodically to determine if a reset has occurred,
> * then polls it to know when the reset is complete.
> * If either the PF or VF reads the register while the hardware
> * is in a reset state, it will return DEADBEEF, which, when masked
> * will result in 3.
> /
> enum virtchnl_vfr_states {
> VIRTCHNL_VFR_INPROGRESS = 0,
> VIRTCHNL_VFR_COMPLETED,
> VIRTCHNL_VFR_VFACTIVE,
> };
> 
> We tried this patch also, increasing the poll time, no help.
> https://github.com/DPDK/dpdk/commit/be7226980c9ad4963b92b489c8afb
> 17f08899953
> 
> Details of the setup:
> 
> DPDK library version
> 21.11
> VF Driver:-
> intel-iavf version 4.0.1-3.2
> PF driver:-
> sudo ethtool -i enp94s0f1
> driver: i40e
> version: 2.14.13
> firmware-version: 8.15 0x800096ca 20.0.17
> 
> Since we are seeing 0xDEADBEEF, I am assuming VF-PF reset mailbox msg is
> received by PF, and PF initiated the RESET sequence by writing VFSWR to
> VPGEN_VFRTRIG register.
> 
> I am not seeing
> " dev_err(&pf->pdev->dev, "VF reset check timeout on VF %d\n", "
> anywhere in syslog.
> 
> Any pointers?, why does this happen(why VF reset is not complete)?...
> 
> One more question, what is the sequence of calls in the reset path?
> i40e_vc_process_vf_msg() -> VIRTCHNL_OP_RESET_VF i40e_vc_reset_vf() ->
> i40e_reset_vf() -> i40e_trigger_vf_reset() & i40e_cleanup_reset_vf()
> 
> this one?
> 
> -Nobin