IB/hfi1: Add interlock between TID RDMA WRITE and other requests

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This locking mechanism is designed to provent vavious memory corruption
scenarios from occurring when requests are pipelined, especially when
RDMA WRITE requests are interleaved with TID RDMA READ requests:
1. READ-AFTER-READ;
2. READ-AFTER-WRITE;
3. WRITE-AFTER-READ;
4. WRITE-AFTER-WRITE.
When memory corruption is likely, a request will be held back until
previous requests have been completed.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Kaike Wan 2019-01-23 21:51:49 -08:00 • committed by Doug Ledford

parent 3c6cb20a0d

commit c6c231175c

3 changed files with 59 additions and 2 deletions

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6

drivers/infiniband/hw/hfi1/rc.c

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46

drivers/infiniband/hw/hfi1/tid_rdma.c

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9

drivers/infiniband/hw/hfi1/tid_rdma.h

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