IBV_WR_SEND_WITH_IMM failure

Hello list,

I am having a puzzling error with IBV_WR_SEND_WITH_IMM. Polling fails
with IBV_WC_RETRY_EXC_ERR when I use buffer bigger that 1KB.
Send/Receive buffers are of a larger size and properly registered.

Incidentally, it fails when exceeding the MTU size of my device, a
Connect-X 3 VPI configured as 10Gb/s RoCE. I have been poking around
the web, and found out that it should not be an issue. Any clue of
what could be happening?

Thanks,
Xavier
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