I checked the following documentation in for libibverbs. I hope this helps.
--- userspace/libibverbs/include/infiniband/verbs.h (revision 5959)
+++ userspace/libibverbs/include/infiniband/verbs.h (working copy)
@@ -795,7 +795,13 @@ static inline int ibv_poll_cq(struct ibv
}
/**
- * ibv_req_notify_cq - Request completion notification on a CQ.
+ * ibv_req_notify_cq - Request completion notification on a CQ. An
+ * event will be added to the completion channel associated with the
+ * CQ when an entry is added to the CQ.
+ * @cq: The completion queue to request notification for.
+ * @solicited_only: If non-zero, an event will be generated only for
+ * the next solicited CQ entry. If zero, any CQ entry, solicited or
+ * not, will generate an event.
*/
static inline int ibv_req_notify_cq(struct ibv_cq *cq, int solicited_only)
{
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