staging/rdma/hfi1: Workaround to prevent corruption during packet delivery

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Disabling one receive context when RX_DMA is receiving a packet can cause
incorrect packet delivery for a subsequent packet on another receive
context.

This is resolved by doing the following:
1. Programming dummy tail address for every receive context
   before enabling it
2. While deallocating receive context resetting tail address
   to dummy address
3. Leaving the dummy address in when disabling tail update
4. When disabling receive context leaving tail update enabled

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Mark F. Brown <mark.f.brown@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Mark F. Brown 2015-11-09 19:18:20 -05:00 • committed by Greg Kroah-Hartman

parent d7b8ba5121

commit 46b010d3ee

3 changed files with 47 additions and 3 deletions

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18

drivers/staging/rdma/hfi1/chip.c

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4

drivers/staging/rdma/hfi1/hfi.h

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28

drivers/staging/rdma/hfi1/init.c

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