Re: [PATCH v1 1/6] staging: qlge: Initialize devlink health dump framework for the dlge driver

From: Coiby Xu
Date: Wed Oct 14 2020 - 23:37:57 EST


On Tue, Oct 13, 2020 at 09:37:04AM +0900, Benjamin Poirier wrote:
On 2020-10-12 19:24 +0800, Coiby Xu wrote:
[...]
> I think, but didn't check in depth, that in those drivers, the devlink
> device is tied to the pci device and can exist independently of the
> netdev, at least in principle.
>
You are right. Take drivers/net/ethernet/mellanox/mlxsw as an example,
devlink reload would first first unregister_netdev and then
register_netdev but struct devlink stays put. But I have yet to
understand when unregister/register_netdev is needed.

Maybe it can be useful to manually recover if the hardware or driver
gets in an erroneous state. I've used `modprobe -r qlge && modprobe
qlge` for the same in the past.

Thank you for providing this user case!

Do we need to
add "devlink reload" for qlge?

Not for this patchset. That would be a new feature.

To implement this feature, it seems I need to understand how qlge work
under the hood. For example, what's the difference between
qlge_soft_reset_mpi_risc and qlge_hard_reset_mpi_risc? Or should we use
a brute-force way like do the tasks in qlge_remove and then re-do the
tasks in qlge_probe? Is a hardware reference manual for qlge device?

--
Best regards,
Coiby