[PATCH RFC 12/12] RDMA/hns: Support fast path for link-down events dispatching

[Junxian Huang]

From: Yuyu Li <liyuyu6@xxxxxxxxxx>

hns3 NIC driver can directly notify the RoCE driver about link status
events bypassing the netdev notifier. This can provide more timely
event dispatching for ULPs.

Signed-off-by: Yuyu Li <liyuyu6@xxxxxxxxxx>
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 697b17cca02e..5c911d1def03 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -7178,9 +7178,22 @@ static int hns_roce_hw_v2_reset_notify(struct hnae3_handle *handle,
 	return ret;
 }
 
+static void hns_roce_hw_v2_link_status_change(struct hnae3_handle *handle,
+					      bool linkup)
+{
+	struct hns_roce_dev *hr_dev = (struct hns_roce_dev *)handle->priv;
+	struct net_device *netdev = handle->rinfo.netdev;
+
+	if (linkup || !hr_dev)
+		return;
+
+	ib_dispatch_port_state_event(&hr_dev->ib_dev, netdev);
+}
+
 static const struct hnae3_client_ops hns_roce_hw_v2_ops = {
 	.init_instance = hns_roce_hw_v2_init_instance,
 	.uninit_instance = hns_roce_hw_v2_uninit_instance,
+	.link_status_change = hns_roce_hw_v2_link_status_change,
 	.reset_notify = hns_roce_hw_v2_reset_notify,
 };
 
-- 
2.33.0