tmp_suning_uos_patched/drivers/infiniband
Steve Wise d37ac31ddc RDMA/cxgb4: Support variable sized work requests
T4 EQ entries are in multiples of 64 bytes.  Currently the RDMA SQ and
RQ use fixed sized entries composed of 4 EQ entries for the SQ and 2
EQ entries for the RQ.  For optimial latency with small IO, we need to
change this so the HW only needs to DMA the EQ entries actually used
by a given work request.

Implementation:

- add wq_pidx counter to track where we are in the EQ.  cidx/pidx are
  used for the sw sq/rq tracking and flow control.

- the variable part of work requests is the SGL.  Add new functions to
  build the SGL and/or immediate data directly in the EQ memory
  wrapping when needed.

- adjust the min burst size for the EQ contexts to 64B.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-07-21 11:16:20 -07:00
..
core IB/ucm: Use memdup_user() 2010-05-25 21:10:57 -07:00
hw RDMA/cxgb4: Support variable sized work requests 2010-07-21 11:16:20 -07:00
ulp IPoIB: Fix world-writable child interface control sysfs attributes 2010-07-06 14:23:22 -07:00
Kconfig IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters 2010-05-23 21:44:54 -07:00
Makefile IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters 2010-05-23 21:44:54 -07:00