function ibv_post_recv() return -1, but according to documentation it should return errno.
How to know the fail reason in this case?
Best Regards,
It returns -1 and sets errno. Check the errno value when the function returns.
What low-level hardware driver are you using? What version? I'm guessing it's libmlx4 (Mellanox ConnectX/ConnectX-2/ConnectX-3).
If so, versions >= libmlx4 1.0.2 actually have this fixed -- ibv_post_send() will return an error code rather than -1.
In any case (and this is actually not very dependent of low-level driver -- I think libmthca, libcxgb4, etc. are petty much the same), the reasons that ibv_post_send()
might return an immediate error are:
send queue is full (ie number of sends posted with uncollected completions is >= size of send queue).
opcode in send WR is invalid
number of gather entries is invalid (either <= 0 or > max gs entries specified when send queue was created)
inline data is bigger than maximum inline data for send queue
EDIT: I see I read the question too fast and confused ibv_post_recv()
and ibv_post_send()
. The answer for ibv_post_recv()
is pretty much the same, just a little simpler. Basically the only reasons why ibv_post_recv()
might return an error are:
receive queue is full
number of scatter entries in a receive work request is invalid
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