[Collectl-interest] patch for Mellanox cards in Ethernet mode

Hi Mark, All,

we've recently started deploying a few systems with Mellanox connectX 
cards used as Ethernet adaptors and a second Mellanox card as Infiniband 
HBA. In this configuration we have been seeing error in syslog as below.

kernel: infiniband mlx4_0: ib_register_mad_agent: QP 0 not supported

This seems to be a bit similar to the issue discussed here:

https://sourceforge.net/p/collectl/discussion/696865/thread/16e495ae/

The attached patch based on the discussions above seems to fix the issue 
for us.

I'll also include a second patch for an error message I noticed while 
investigating this. Note that I'm not that fluent in perl, so I'm not 
sure if this is the right fix or if this just hides something else...

I would appreciate if these patches could be included in future releases 
if appropriate.

Kind regards,
Frederik
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Frederik Ferner
Senior Computer Systems Administrator (storage) phone: +44 1235 77 8624
Diamond Light Source Ltd.                       mob:   +44 7917 08 5110

Duty Sys Admin can be reached on x8596


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