Re: kern/53814: wm0 device timeout in netbsd 7.1

[Masanobu SAITOH <msaitoh%execsw.org@localhost>]

On 2018/12/26 15:50, aravind.ss1094%gmail.com@localhost wrote:
> > Number:         53814
> > Category:       kern
> > Synopsis:       wm0 device timeout in netbsd 7.1
> > Confidential:   no
> > Severity:       serious
> > Priority:       medium
> > Responsible:    kern-bug-people
> > State:          open
> > Class:          sw-bug
> > Submitter-Id:   net
> > Arrival-Date:   Wed Dec 26 06:50:00 +0000 2018
> > Originator:     Aravind Mani
> > Release:        netbsd 7.1
> > Organization:
> private organization
> > Environment:
> chip type: I354
> > Description:
> We use WM_T_I354 chip type.When we reload continuously,we could able to observe device timeout issue. wm_init(),wm_reset() doesn't help to recover from problem state.The only way to recover is to reload the switch.There was no initialization error.
> > From wm_print_stats() and wm_pkt_stats(),i don't see any value in the registers listed and the packets are not hitting the hardware.
> wm_reset also didn't help to recover the issue.
>
> Do you need any other output to investigate further?
> Is there any other way to recover from this issue?.
> Is there any other fix has been done around this area?.
>
>
>
> > How-To-Repeat:
> Reload the switch continuously that runs with NetBSD 7.1.
> > Fix:

 Are you using modified version of if_wm.c? It has neither wm_print_stats()
nor wm_pkt_stats().

> Do you need any other output to investigate further?

wm(4) has WM_EVENT_COUNTERS option, so it would be good to
add "options WM_EVENT_COUNTERS" into your kernel configuration
file and see vmstat -e.

> Reload the switch continuously that runs with NetBSD 7.1.

It's little hard to know what triggers the problem because
I don't know what your switch implementation do in the reload.

I have SGMII based C2000 machines. I've not tested on others
(e.g. KX, PCIe SERDES or GMII). It would be good to check your
PHY configuration and/or status if your system is not SGMII based.


--
-----------------------------------------------
                SAITOH Masanobu (msaitoh%execsw.org@localhost
                                 msaitoh%netbsd.org@localhost)