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RDMA/vmw_pvrdma: Report CQ missed events

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There is a chance of a race between arming the CQ and receiving
completions. By reporting CQ missed events any ULPs should poll
again to get the completions.

Fixes: 29c8d9eba5 ("IB: Add vmw_pvrdma driver")
Acked-by: Aditya Sarwade <asarwade@vmware.com>
Signed-off-by: Bryan Tan <bryantan@vmware.com>
Signed-off-by: Adit Ranadive <aditr@vmware.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bryan Tan 2017-08-10 12:05:02 -07:00 committed by Doug Ledford
parent 48107c4e59
commit a7d2e03928
1 changed files with 16 additions and 1 deletions
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17
drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
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@ -65,13 +65,28 @@ int pvrdma_req_notify_cq(struct ib_cq *ibcq,
struct pvrdma_dev *dev = to_vdev(ibcq->device);
struct pvrdma_cq *cq = to_vcq(ibcq);
u32 val = cq->cq_handle;
unsigned long flags;
int has_data = 0;
val |= (notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
PVRDMA_UAR_CQ_ARM_SOL : PVRDMA_UAR_CQ_ARM;
spin_lock_irqsave(&cq->cq_lock, flags);
pvrdma_write_uar_cq(dev, val);
return 0;
if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
unsigned int head;
has_data = pvrdma_idx_ring_has_data(&cq->ring_state->rx,
cq->ibcq.cqe, &head);
if (unlikely(has_data == PVRDMA_INVALID_IDX))
dev_err(&dev->pdev->dev, "CQ ring state invalid\n");
}
spin_unlock_irqrestore(&cq->cq_lock, flags);
return has_data;
}
/**