From: Bryan Tan <bryantan@xxxxxxxxxx>
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: 29c8d9eba550 ("IB: Add vmw_pvrdma driver")
Acked-by: Aditya Sarwade <asarwade@xxxxxxxxxx>
Signed-off-by: Bryan Tan <bryantan@xxxxxxxxxx>
Signed-off-by: Adit Ranadive <aditr@xxxxxxxxxx>
---
drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
index 69bda61..f4ab5fa 100644
--- a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
+++ b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
@@ -65,12 +65,27 @@ 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;
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);
+ if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
+ unsigned int head;
+
+ if (pvrdma_idx_ring_has_data(&cq->ring_state->rx,
+ cq->ibcq.cqe, &head)) {
+ spin_unlock_irqrestore(&cq->cq_lock, flags);
+ return 1;
+ }
+ }
+
+ spin_unlock_irqrestore(&cq->cq_lock, flags);
+
return 0;
}
--
2.7.4
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