Jack Morgenstein ea54b10c77 IB/mlx4: Use multiple WQ blocks to post smaller send WQEs ... ConnectX HCA supports shrinking WQEs, so that a single work request can be made of multiple units of wqe_shift. This way, WRs can differ in size, and do not have to be a power of 2 in size, saving memory and speeding up send WR posting. Unfortunately, if we do this then the wqe_index field in CQEs can't be used to look up the WR ID anymore, so our implementation does this only if selective signaling is off. Further, on 32-bit platforms, we can't use vmap() to make the QP buffer virtually contigious. Thus we have to use constant-sized WRs to make sure a WR is always fully within a single page-sized chunk. Finally, we use WRs with the NOP opcode to avoid wrapping around the queue buffer in the middle of posting a WR, and we set the NoErrorCompletion bit to avoid getting completions with error for NOP WRs. However, NEC is only supported starting with firmware 2.2.232, so we use constant-sized WRs for older firmware. And, since MLX QPs only support SEND, we use constant-sized WRs in this case. When stamping during NOP posting, do stamping following setting of the NOP WQE valid bit. Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il> Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>		2008-02-08 13:30:02 -08:00
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cmd.h	IB/mlx4: Handle FW command interface rev 3	2007-06-18 08:15:02 -07:00
cq.h
device.h	IB/mlx4: Use multiple WQ blocks to post smaller send WQEs	2008-02-08 13:30:02 -08:00
doorbell.h	mlx4_core: Kill mlx4_write64_raw()	2007-10-14 20:17:39 -07:00
driver.h
qp.h	IB/mlx4: Use multiple WQ blocks to post smaller send WQEs	2008-02-08 13:30:02 -08:00
srq.h