RDMA/cm: Base cm_id destruction timeout on CMA values

RDMA/cm: Base cm_id destruction timeout on CMA values

When a GSI MAD packet is sent on the QP, it will potentially be
retried CMA_MAX_CM_RETRIES times with a timeout value of:

    4.096usec * 2 ^ CMA_CM_RESPONSE_TIMEOUT

The above equates to ~64 seconds using the default CMA values.

The cm_id_priv's refcount will be incremented for this period.
Therefore, the timeout value waiting for a cm_id destruction must be
based on the effective timeout of MAD packets.  To provide additional
leeway, we add 25% to this timeout and use that instead of the
constant 10 seconds timeout, which may result in false negatives.

Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Link: https://patch.msgid.link/20251021132738.4179604-1-haakon.bugge@oracle.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>