net/rds: Assign the correct service level

net/rds: Assign the correct service level

Commit 2bbf6158c769 ("net/rds: remove the RDS specific path record
caching") has changed the service level (SL) to TOS mapping to be
1:1. Nevertheless, it has assigned the SL to be a 8-bit value even though
IB specification section 7.7.3 mentioned that the SL is only a 4-bit
field. Thus, this patch assigns the SL correctly.

Orabug: 27607213

Signed-off-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reported-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
(cherry picked from commit 8305552e624618c7196575d5a6ae64c0c024fc20
repo uek5)

Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>