net: hns3: add suspend and resume pm_ops

To implement the system suspend/resume functions, the NIC driver needs
to support:
1. When the system enters the suspend mode, the driver needs to
implement the suspend callback function of the NIC device. The driver
needs to mute the device, stop all RX/TX activities of the device, and
unmap the interrupt.
2. When the system enters the resume mode, the driver needs to
implement the resume callback function of the NIC device and restore
the device to the state before suspension.

When the system enters the suspend and resume mode, the NIC driver
actually executes the PF function reset process.

When the PFs are suspending/resuming, VFs also enter the suspend/resume
state because the PFs trigger the VFs to reset, therefore no operation
is required when the VF pci_driver is suspending or resuming.

Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 67fc5aa42bdd8fb449c3bb7ca48c41f2e69180f0..25afe5a3348ce1ff186056577dac0837ef09d440 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2365,6 +2365,32 @@ static void hns3_shutdown(struct pci_dev *pdev)
                pci_set_power_state(pdev, PCI_D3hot);
 }
 
+static int __maybe_unused hns3_suspend(struct device *dev)
+{
+       struct hnae3_ae_dev *ae_dev = dev_get_drvdata(dev);
+
+       if (hns3_is_phys_func(ae_dev->pdev)) {
+               dev_info(dev, "Begin to suspend.\n");
+               if (ae_dev && ae_dev->ops && ae_dev->ops->reset_prepare)
+                       ae_dev->ops->reset_prepare(ae_dev, HNAE3_FUNC_RESET);
+       }
+
+       return 0;
+}
+
+static int __maybe_unused hns3_resume(struct device *dev)
+{
+       struct hnae3_ae_dev *ae_dev = dev_get_drvdata(dev);
+
+       if (hns3_is_phys_func(ae_dev->pdev)) {
+               dev_info(dev, "Begin to resume.\n");
+               if (ae_dev && ae_dev->ops && ae_dev->ops->reset_done)
+                       ae_dev->ops->reset_done(ae_dev);
+       }
+
+       return 0;
+}
+
 static pci_ers_result_t hns3_error_detected(struct pci_dev *pdev,
                                            pci_channel_state_t state)
 {
@@ -2443,12 +2469,15 @@ static const struct pci_error_handlers hns3_err_handler = {
        .reset_done     = hns3_reset_done,
 };
 
+static SIMPLE_DEV_PM_OPS(hns3_pm_ops, hns3_suspend, hns3_resume);
+
 static struct pci_driver hns3_driver = {
        .name     = hns3_driver_name,
        .id_table = hns3_pci_tbl,
        .probe    = hns3_probe,
        .remove   = hns3_remove,
        .shutdown = hns3_shutdown,
+       .driver.pm  = &hns3_pm_ops,
        .sriov_configure = hns3_pci_sriov_configure,
        .err_handler    = &hns3_err_handler,
 };

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 47c95dcec3d7726f4da0c0008aa19d7746619dec..c446b63be503102b9d4bfb7967fe0d1532d489e8 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -11094,6 +11094,8 @@ retry:
 
        if (hdev->reset_type == HNAE3_FLR_RESET)
                hdev->rst_stats.flr_rst_cnt++;
+       else if (hdev->reset_type == HNAE3_FUNC_RESET)
+               hdev->rst_stats.pf_rst_cnt++;
 }
 
 static void hclge_reset_done(struct hnae3_ae_dev *ae_dev)