Re: [EXT] [PATCH 09/15] qed: use new module_firmware_crashed()

quoted

So I think its not a good place to insert this call.
Its hard to find exact good place to insert it in qed.

Is there a way to check if what happened was indeed a fw crash?

Our driver has two firmwares (slowpath and fastpath).
For slowpath firmware the way to understand it crashed is to observe command
response timeout. This is in qed_mcp.c, around "The MFW failed to respond to
command" traceout.

For fastpath this is tricky, think you may leave the above place as the only
place to invoke module_firmware_crashed()

quoted

One more thing is that AFAIU taint flag gets permanent on kernel, but

for

quoted

example our device can recover itself from some FW crashes, thus it'd be
transparent for user.

Similar things are *supposed* to recoverable with other device, however
this can also sometimes lead to a situation where devices are not usable
anymore, and require a full driver unload / load.

quoted

Whats the logical purpose of module_firmware_crashed? Does it mean fatal
unrecoverable error on device?

Its just to annotate on the module and kernel that this has happened.

I take it you may agree that, firmware crashing *often* is not good
design,
and these issues should be reported to / fixed by vendors. In cases
where driver bugs are reported it is good to see if a firmware crash has
happened before, so that during analysis this is ruled out.

Probably, but still I see some misalignment here, in sense that taint is about
the kernel state, not about a hardware state indication.

devlink health could really be a much better candidate for such things.

Regards
  Igor