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IBTA declares "vendor option not supported" reject reason in REJ messages
if passive side doesn't want to accept proposed ECE options.

Due to the fact that ECE is managed by userspace, there is a need to let
users to provide such rejected reason.

Link: https://lore.kernel.org/r/20200526103304.196371-7-leon@kernel.org

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>