iw_cxgb4: don't truncate the recv window size

Fixed a bug that shows up with recv window sizes that exceed the size of
the RCV_BUFSIZ field in opt0 (>= 1024K).  If the recv window exceeds
this, then we specify the max possible in opt0, add add the rest in via
a RX_DATA_ACK credits.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/infiniband/hw/cxgb4/cm.c
Simple merge

diff --cc drivers/infiniband/hw/cxgb4/iw_cxgb4.h
Simple merge

diff --cc drivers/net/ethernet/chelsio/cxgb4/t4_msg.h
Simple merge