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[for-next,2/2] {topost} RDMA/hns: Add support for sending port down event quickly

Message ID 1570184954-21384-3-git-send-email-liweihang@hisilicon.com (mailing list archive)
State Changes Requested
Delegated to: Jason Gunthorpe
Headers show
Series RDMA/hns: Add support of net device event reporting to ULP | expand

Commit Message

Weihang Li Oct. 4, 2019, 10:29 a.m. UTC 
From: Lang Cheng <chenglang@huawei.com>

When the netdev port status changes, the roce driver sends a port down
event by parsing the netdev event dispatched by IB_CORE, which takes about
a few hundred milliseconds. It is not fast enough for ULP sometimes.

The HNS NIC driver can directly notify the ROCE driver to send port event
via callback function, which will only take a few milliseconds.
This patch implements above callback function.

Signed-off-by: Lang Cheng <chenglang@huawei.com>
Signed-off-by: Weihang Li <liweihang@hisilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 34 ++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
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Patch

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 20918f8..3196a11 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -6727,9 +6727,43 @@  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;
+	struct ib_event event;
+	unsigned long flags;
+	u8 phy_port;
+
+	if (linkup || !hr_dev)
+		return;
+
+	for (phy_port = 0; phy_port < hr_dev->caps.num_ports; phy_port++)
+		if (netdev == hr_dev->iboe.netdevs[phy_port])
+			break;
+
+	if (phy_port == hr_dev->caps.num_ports)
+		return;
+
+	spin_lock_irqsave(&hr_dev->iboe.lock, flags);
+	if (hr_dev->iboe.port_state[phy_port] == IB_PORT_DOWN) {
+		spin_unlock_irqrestore(&hr_dev->iboe.lock, flags);
+		return;
+	}
+	hr_dev->iboe.port_state[phy_port] = IB_PORT_DOWN;
+	spin_unlock_irqrestore(&hr_dev->iboe.lock, flags);
+
+	event.device = &hr_dev->ib_dev;
+	event.element.port_num = to_rdma_port_num(phy_port);
+	event.event = IB_EVENT_PORT_ERR;
+	ib_dispatch_event(&event);
+}
+
 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,
 };