[openib-general] segmentation fault in ibv_modify_srq

[Roland Dreier]

    Matt>    Is this due to memfree vs. memfull hardware or firmware
    Matt> difference?  If you flash the memfull HCA with the memfree
    Matt> firmware (which I was told you can do) will the HCA generate
    Matt> an SRQ limit reached event?

I believe it's a firmware difference.  There are basically three
Mellanox HCA chips:

MT23108 - PCI-X - memfull only (FW 3.x.y)
MT25208 - 2 port PCI Express - memfull (FW 4.x.y) or memfree (FW 5.x.y)
                               memfree FW will work even if HCA board
                               has memory on it.  Obviously memfree FW
                               is required if the HCA board has no memory.
MT25204 - 1 port PCI Express - memfree only (FW 1.x.y)

Any HCA that works with memfree FW (ie any PCI Express HCA) should be
able to generate SRQ limit events.  In the current FW release, memfull
HCAs do not generate SRQ limit events.

 - R.