staging/rdma/hfi1: Add coalescing support for SDMA TX descriptors

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This fixes transmit errors when the number of scatter gather elements in the
request is more that the number of per packet descriptors supported by the
hardware, allocate and coalesce the extra scatter gather elements into a single
buffer. The last descriptor is reserved and used for this coalesced buffer.

Verbs potentially need this support when transferring small data chunks
involving different memory regions.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Niranjana Vishwanathapura 2015-10-26 10:28:32 -04:00 • committed by Greg Kroah-Hartman

parent 3c2f85b8ce

commit f4d26d81ad

2 changed files with 168 additions and 30 deletions

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124

drivers/staging/rdma/hfi1/sdma.c

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74

drivers/staging/rdma/hfi1/sdma.h

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