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    IB/srp: Drain the send queue before destroying a QP · 9294000d
    Bart Van Assche 提交于
    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: NBart 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: NDoug Ledford <dledford@redhat.com>
    9294000d
ib_srp.c 99.0 KB