IB/srp: Drain the send queue before destroying a QP

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A quote from the IB spec:

However, if the Consumer does not wait for the Affiliated Asynchronous
Last WQE Reached Event, then WQE and Data Segment leakage may occur.
Therefore, it is good programming practice to tear down a QP that is
associated with an SRQ by using the following process:
* Put the QP in the Error State;
* wait for the Affiliated Asynchronous Last WQE Reached Event;
* either:
  * drain the CQ by invoking the Poll CQ verb and either wait for CQ
    to be empty or the number of Poll CQ operations has exceeded CQ
    capacity size; or
  * post another WR that completes on the same CQ and wait for this WR to return as a WC;
* and then invoke a Destroy QP or Reset QP.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Israel Rukshin <israelr@mellanox.com>
Cc: Max Gurtovoy <maxg@mellanox.com>
Cc: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

...

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Bart Van Assche 2017-02-14 10:56:36 -08:00 • committed by Doug Ledford

parent f039f44fc3

commit 9294000d6d

1 changed files with 14 additions and 5 deletions

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19

drivers/infiniband/ulp/srp/ib_srp.c

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