mlx4 weird error "Failed to map EQ context memory" after update

[Hans Petter Selasky]

On 01/20/18 00:17, Greg V via freebsd-net wrote:
> 
> On 01/19/2018 12:54, Hans Petter Selasky wrote:
>> On 01/18/18 14:11, Greg V wrote:
>>> Hi. I've upgraded CURRENT from December 19 
>>> (https://github.com/freebsd/freebsd/commit/fd53ccf393f4f8ac1948e97eca108) 
>>> to today 
>>> (https://github.com/freebsd/freebsd/commit/391a83c86bb91ae3840cf37b7de478f42cc97e2a) 
>>> and my Mellanox ConnectX-2 network card stopped working:
>>>
>>> mlx4_core0: <mlx4_core> mem 
>>> 0xfe100000-0xfe1fffff,0xf0800000-0xf0ffffff irq 32 at device 0.0 on pci7
>>> mlx4_core: Mellanox ConnectX core driver v3.4.1 (October 2017)
>>> mlx4_core: Initializing mlx4_core
>>> mlx4_core0: command 0xffa failed: fw status = 0x1
>>> mlx4_core0: Failed to map EQ context memory, aborting
>>> device_attach: mlx4_core0 attach returned 12
>>>
>>>
>>> Loading the OLD mlx4.ko and mlx4en.ko on the NEW kernel actually does 
>>> work fine!
>>>
>>> Reverting all mlx4 changes between then and now (no big changes, 
>>> mostly just the 1 << 31 thing from D13858) and rebuilding the mlx4 
>>> module with CC=clang50 does not help.
>>>
>>> What happened?!
>>
>> Hi,
>>
>> Can you do:
>>
>> objdump -Dx /boot/kernel/mlx4.ko > mlx4.ko.txt
>> objdump -Dx /boot/kernel/mlx4en.ko > mlx4en.ko.txt
>>
>> And diff the text result between working and non-working ko's.
> That results in 180883 lines (9.2 megabytes) of diff for mlx4.ko. The 
> CC=clang50 one is only a bit better at 7.6 MB :(

Can you open this diff using "meld". And look for instructions which 
have changed, not only their location.

--HPS