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| author | Mike Marciniszyn <mike.marciniszyn@qlogic.com> | 2011-02-16 15:48:25 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-02-17 14:04:50 -0800 |
| commit | c0af2c057d7ce3f0b260f9380d187a82bb5cab28 (patch) | |
| tree | 30b59bf396145825d5b005dcc8f6fa1abf5c2b1f /drivers/infiniband | |
| parent | 414ed90cee32486c50f91b28990443e0dc21c868 (diff) | |
| download | linux-c0af2c057d7ce3f0b260f9380d187a82bb5cab28.tar.gz linux-c0af2c057d7ce3f0b260f9380d187a82bb5cab28.tar.bz2 linux-c0af2c057d7ce3f0b260f9380d187a82bb5cab28.zip | |
IB/qib: Prevent double completions after a timeout or RNR error
There is a double completion associated with error handling for RC QPs.
The sequence is:
- The do_rc_ack() routine fields an RNR nack and there are 0
rnr_retries configured on the QP.
- qib_error_qp() stops the pending timer
- qib_rc_send_complete() is called from sdma_complete()
- qib_rc_send_complete() starts the timer because the msb of the psn
just completed says an ack is needed.
- a bunch of flushes occur as ipoib posts WQEs to an error'ed QP
- rc_timeout() calls qib_restart_rc()
- qib_restart_rc() calls qib_send_complete() with a
IB_WC_RETRY_EXC_ERR on a wqe that has already been completed in the
past
The fix avoids starting the timer since another packet will never
arrive.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_rc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/qib/qib_rc.c b/drivers/infiniband/hw/qib/qib_rc.c index 31e09b05a1a7..eca0c41f1226 100644 --- a/drivers/infiniband/hw/qib/qib_rc.c +++ b/drivers/infiniband/hw/qib/qib_rc.c @@ -1005,7 +1005,8 @@ void qib_rc_send_complete(struct qib_qp *qp, struct qib_ib_header *hdr) * there are still requests that haven't been acked. */ if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail && - !(qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR | QIB_S_WAIT_PSN))) + !(qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR | QIB_S_WAIT_PSN)) && + (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) start_timer(qp); while (qp->s_last != qp->s_acked) { |