From: Steve Wise <swise@opengridcomputing.com>
Date: Thu, 10 Jun 2010 19:03:00 +0000 (+0000)
Subject: RDMA/cxgb4: Support variable sized work requests
X-Git-Tag: v2.6.36-rc1~492^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d37ac31ddc24c1a0beed134278bc074c98812210;p=pandora-kernel.git

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>
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