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net: hns3: adjust the process of PF reset

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When doing PF reset, the driver needs to do some preparatory work
before asserting PF reset. Since when hardware is resetting, it
is necessary to stop tx/rx queue, clear hardware table, etc,
otherwise hardware may run into unrecoverable state if there is
still IO running when the hardware is resetting.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Huazhong Tan 2018-11-07 12:06:15 +08:00 committed by David S. Miller
parent 0742ed7c24
commit 35d93a3004
1 changed files with 36 additions and 2 deletions
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38
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
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@ -2396,7 +2396,6 @@ static void hclge_do_reset(struct hclge_dev *hdev)
break;
case HNAE3_FUNC_RESET:
dev_info(&pdev->dev, "PF Reset requested\n");
hclge_func_reset_cmd(hdev, 0);
/* schedule again to check later */
set_bit(HNAE3_FUNC_RESET, &hdev->reset_pending);
hclge_reset_task_schedule(hdev);
@ -2462,6 +2461,35 @@ static void hclge_clear_reset_cause(struct hclge_dev *hdev)
hclge_enable_vector(&hdev->misc_vector, true);
}
static int hclge_reset_prepare_wait(struct hclge_dev *hdev)
{
int ret = 0;
switch (hdev->reset_type) {
case HNAE3_FUNC_RESET:
ret = hclge_func_reset_cmd(hdev, 0);
if (ret) {
dev_err(&hdev->pdev->dev,
"assertting function reset fail %d!\n", ret);
return ret;
}
/* After performaning pf reset, it is not necessary to do the
* mailbox handling or send any command to firmware, because
* any mailbox handling or command to firmware is only valid
* after hclge_cmd_init is called.
*/
set_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state);
break;
default:
break;
}
dev_info(&hdev->pdev->dev, "prepare wait ok\n");
return ret;
}
static void hclge_reset(struct hclge_dev *hdev)
{
struct hnae3_ae_dev *ae_dev = pci_get_drvdata(hdev->pdev);
@ -2477,6 +2505,8 @@ static void hclge_reset(struct hclge_dev *hdev)
hclge_notify_client(hdev, HNAE3_DOWN_CLIENT);
rtnl_unlock();
hclge_reset_prepare_wait(hdev);
if (!hclge_reset_wait(hdev)) {
rtnl_lock();
hclge_notify_client(hdev, HNAE3_UNINIT_CLIENT);
@ -4873,7 +4903,11 @@ static void hclge_ae_stop(struct hnae3_handle *handle)
cancel_work_sync(&hdev->service_task);
clear_bit(HCLGE_STATE_SERVICE_SCHED, &hdev->state);
if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state)) {
/* If it is not PF reset, the firmware will disable the MAC,
* so it only need to stop phy here.
*/
if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state) &&
hdev->reset_type != HNAE3_FUNC_RESET) {
hclge_mac_stop_phy(hdev);
return;
}