RDMA/hns: Add SRQ asynchronous event support

This patch implements the process flow of SRQ asynchronous
event.
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_device.h

@@ -646,6 +646,12 @@ struct hns_roce_aeqe {
 			u32 rsv1;
 		} qp_event;
 
+		struct {
+			__le32 srq;
+			u32 rsv0;
+			u32 rsv1;
+		} srq_event;
+
 		struct {
 			__le32 cq;
 			u32 rsv0;
@@ -1135,6 +1141,7 @@ void hns_roce_free_db(struct hns_roce_dev *hr_dev, struct hns_roce_db *db);
 void hns_roce_cq_completion(struct hns_roce_dev *hr_dev, u32 cqn);
 void hns_roce_cq_event(struct hns_roce_dev *hr_dev, u32 cqn, int event_type);
 void hns_roce_qp_event(struct hns_roce_dev *hr_dev, u32 qpn, int event_type);
+void hns_roce_srq_event(struct hns_roce_dev *hr_dev, u32 srqn, int event_type);
 int hns_get_gid_index(struct hns_roce_dev *hr_dev, u8 port, int gid_index);
 int hns_roce_init(struct hns_roce_dev *hr_dev);
 void hns_roce_exit(struct hns_roce_dev *hr_dev);

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -4459,6 +4459,7 @@ static int hns_roce_v2_aeq_int(struct hns_roce_dev *hr_dev,
 	int aeqe_found = 0;
 	int event_type;
 	int sub_type;
+	u32 srqn;
 	u32 qpn;
 	u32 cqn;
 
@@ -4481,6 +4482,9 @@ static int hns_roce_v2_aeq_int(struct hns_roce_dev *hr_dev,
 		cqn = roce_get_field(aeqe->event.cq_event.cq,
 				     HNS_ROCE_V2_AEQE_EVENT_QUEUE_NUM_M,
 				     HNS_ROCE_V2_AEQE_EVENT_QUEUE_NUM_S);
+		srqn = roce_get_field(aeqe->event.srq_event.srq,
+				     HNS_ROCE_V2_AEQE_EVENT_QUEUE_NUM_M,
+				     HNS_ROCE_V2_AEQE_EVENT_QUEUE_NUM_S);
 
 		switch (event_type) {
 		case HNS_ROCE_EVENT_TYPE_PATH_MIG:
@@ -4488,13 +4492,14 @@ static int hns_roce_v2_aeq_int(struct hns_roce_dev *hr_dev,
 		case HNS_ROCE_EVENT_TYPE_COMM_EST:
 		case HNS_ROCE_EVENT_TYPE_SQ_DRAINED:
 		case HNS_ROCE_EVENT_TYPE_WQ_CATAS_ERROR:
+		case HNS_ROCE_EVENT_TYPE_SRQ_LAST_WQE_REACH:
 		case HNS_ROCE_EVENT_TYPE_INV_REQ_LOCAL_WQ_ERROR:
 		case HNS_ROCE_EVENT_TYPE_LOCAL_WQ_ACCESS_ERROR:
 			hns_roce_qp_event(hr_dev, qpn, event_type);
 			break;
 		case HNS_ROCE_EVENT_TYPE_SRQ_LIMIT_REACH:
-		case HNS_ROCE_EVENT_TYPE_SRQ_LAST_WQE_REACH:
 		case HNS_ROCE_EVENT_TYPE_SRQ_CATAS_ERROR:
+			hns_roce_srq_event(hr_dev, srqn, event_type);
 			break;
 		case HNS_ROCE_EVENT_TYPE_CQ_ACCESS_ERROR:
 		case HNS_ROCE_EVENT_TYPE_CQ_OVERFLOW:

drivers/infiniband/hw/hns/hns_roce_srq.c

@@ -9,6 +9,29 @@
 #include "hns_roce_cmd.h"
 #include "hns_roce_hem.h"
 
+void hns_roce_srq_event(struct hns_roce_dev *hr_dev, u32 srqn, int event_type)
+{
+	struct hns_roce_srq_table *srq_table = &hr_dev->srq_table;
+	struct hns_roce_srq *srq;
+
+	xa_lock(&srq_table->xa);
+	srq = xa_load(&srq_table->xa, srqn & (hr_dev->caps.num_srqs - 1));
+	if (srq)
+		atomic_inc(&srq->refcount);
+	xa_unlock(&srq_table->xa);
+
+	if (!srq) {
+		dev_warn(hr_dev->dev, "Async event for bogus SRQ %08x\n", srqn);
+		return;
+	}
+
+	srq->event(srq, event_type);
+
+	if (atomic_dec_and_test(&srq->refcount))
+		complete(&srq->free);
+}
+EXPORT_SYMBOL_GPL(hns_roce_srq_event);
+
 static void hns_roce_ib_srq_event(struct hns_roce_srq *srq,
 				  enum hns_roce_event event_type)
 {