Multiple "if"s and "||" make extension of process_mad() function as a tedious task, rewrite that function to be more readable. Link: https://lore.kernel.org/r/20191029062745.7932-14-leon@kernel.org Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>