[openfabrics-ewg] OFED-1.1-rc4 is ready

[Robert Walsh]

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> I don't think you can do symbol versioning here.

Right - probably being a little more verbose about finding the file but
not the symbol would be a good idea, though.  It took me a bit of gdb
work to track the problem down: not really a big deal, but a clearer
error might have helped.

Another idea (I haven't thought the implications through yet - just
throwing it out there) is to dlsym() a "version" symbol that the library
is expected to provide and check that it matches what you expect it to:
sort of like the way the user verbs stuff checks that the kernel uverbs
module matches it.  If dlsym() fails to find a symbol, then you're
running an older one anyway.

None of this helps at compile time, where it would be preferable to spot
the problem.  Another not-really-sat-down-and-thought-about-it idea is
to have something like this in infiniband/driver.h:

  #define VERBS_LIBRARY_VERSION 2

  #ifdef VERBS_DRIVER_VERSION
  #if VERBS_DRIVER_VERSION != VERBS_LIBRARY_VERSION
  #error verbs library version doesn't match driver version.
  #endif
  #endif

The VERBS_LIBRARY_VERSION would be bumped on an API change.

VERBS_DRIVER_VERSION would be defined in the driver library (in mthca.h,
ipathverbs.h and ehca_uinit.c) and would be updated to match.

Just brainstorming.  Anyone else got any thoughts or suggestions?

Regards,
 Robert.
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