IB/hfi1: Drop stale TID RDMA packets that cause TIDErr

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In a congested fabric with adaptive routing enabled, traces show that
packets could be delivered out of order. A stale TID RDMA data packet
could lead to TidErr if the TID entries have been released by duplicate
data packets generated from retries, and subsequently erroneously force
the qp into error state in the current implementation.

Since the payload has already been dropped by hardware, the packet can
be simply dropped and it is no longer necessary to put the qp into
error state.

Fixes: 9905bf06e8 ("IB/hfi1: Add functions to receive TID RDMA READ response")
Cc: <stable@vger.kernel.org>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Link: https://lore.kernel.org/r/20190815192058.105923.72324.stgit@awfm-01.aw.intel.com
Signed-off-by: Doug Ledford <dledford@redhat.com>

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This commit is contained in:

Kaike Wan 2019-08-15 15:20:58 -04:00 • committed by Doug Ledford

parent 90fdae66e7

commit d9d1f5e7bb

1 changed files with 3 additions and 44 deletions

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drivers/infiniband/hw/hfi1/tid_rdma.c

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