Remove support for unsignaled receive requests.  This is a
non-standard extension to the IB spec that is not used by any known
applications or protocols, and is not supported by newer hardware.
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>