[Bug 290793] iovctl on mlx5en won't work

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290793

--- Comment #4 from Bjoern A. Zeeb <[email protected]> ---
(In reply to David BOYER from comment #3)

What's the call graph into this?


I can only find mlx5_core/mlx5_main.c::request_bar -> pci_request_regions()
which ends up at the end of a loop in lkpi_pci_request_region().

You made me actually look at Linux code and there you end up in
__pci_request_region()
which has the same checks at the beginning it seems:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/pci.c#n3935

So the problem is likely elsewhere in the LinuxKPI emulation or in mlx5.


Also the error logged:
mlx5_core2: lkpi_pci_request_region: failed to alloc bar 0 type 3 rid 16
comes from after that check?  So if it would fail and return we would not see
this?  Is that a secondary problem?


If you say "On FreeBSD, the BAR size of VFs can temporarily be 0 and."
Would we assume mlx5core to only call pci_request_regions() once they are
properly initialized?


I am trying to get access to a mlx5 in order to see if I can dig into this but
someone who knows the driver should likely be able to do this a lot easier than
I.

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