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-rw-r--r--include/rdma/rdmavt_qp.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/rdma/rdmavt_qp.h b/include/rdma/rdmavt_qp.h
index f88392204ae9..8275954f5ce6 100644
--- a/include/rdma/rdmavt_qp.h
+++ b/include/rdma/rdmavt_qp.h
@@ -263,6 +263,25 @@ struct rvt_rq {
spinlock_t lock ____cacheline_aligned_in_smp;
};
+/**
+ * rvt_get_rq_count - count numbers of request work queue entries
+ * in circular buffer
+ * @rq: data structure for request queue entry
+ * @head: head indices of the circular buffer
+ * @tail: tail indices of the circular buffer
+ *
+ * Return - total number of entries in the Receive Queue
+ */
+
+static inline u32 rvt_get_rq_count(struct rvt_rq *rq, u32 head, u32 tail)
+{
+ u32 count = head - tail;
+
+ if ((s32)count < 0)
+ count += rq->size;
+ return count;
+}
+
/*
* This structure holds the information that the send tasklet needs
* to send a RDMA read response or atomic operation.