[openib-general] Different low level drivers returns different return values incase of an error

[Dotan Barak]

Hi.

I noticed that low level drivers from different vendors don't act the 
same when there is an error.
For example:
    when ibv_post_send fails, libmthca returns -1
    when ibv_post_send fails, libehca returns -(errno value), such as: 
-EINVAL, -ENOMEM
    (i didn't check the code of ipath)

I wrote the man pages to the libibverbs (that i hope, soon will be 
committed), and tried to describe the
return values of the verbs.

I don't think that the description(behavior) of the verb need to be 
according to the HW which is being used ..

If we are going to change to change the return values to a common 
behavior i suggest to use a way
which will give more information to the user that uses the verbs (create 
IB oriented errno values(?)), or
another method which will give the user a hint of the problem. for 
example: when the user try to modify a QP
with a bad value there is an EINVAL return value for all of the values 
that he tries to modify ...

What do you think?
Dotan