[dpdk-dev] [PATCH 06/10] net/hns3: clear residual hardware configurations on init

[Wei Hu (Xavier)]

From: Hongbo Zheng <zhenghongbo3 at huawei.com>

When the last driver exits abnormally, for example, it is killed by
'kill -9', it may be too late to clear the configuration and cause the
configuration to remain. Therefore, to ensure that the hardware environment
is clean during initialization, the PF driver actively clear the hardware
environment during initialization, including PF and corresponding VFs'
vlan, mac, flow table configurations, etc.

Fixes: d51867db65c1 ("net/hns3: add initialization")
Cc: stable at dpdk.org

Signed-off-by: Hongbo Zheng <zhenghongbo3 at huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei at huawei.com>
Signed-off-by: Chengwen Feng <fengchengwen at huawei.com>
---
 drivers/net/hns3/hns3_cmd.h    |  3 +++
 drivers/net/hns3/hns3_ethdev.c | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/net/hns3/hns3_cmd.h b/drivers/net/hns3/hns3_cmd.h
index da770ac..b203e66 100644
--- a/drivers/net/hns3/hns3_cmd.h
+++ b/drivers/net/hns3/hns3_cmd.h
@@ -207,6 +207,9 @@ enum hns3_opcode_type {
 	HNS3_OPC_FD_AD_OP               = 0x1204,
 	HNS3_OPC_FD_COUNTER_OP          = 0x1205,
 
+	/* Clear hardware state command */
+	HNS3_OPC_CLEAR_HW_STATE         = 0x700A,
+
 	/* SFP command */
 	HNS3_OPC_SFP_GET_SPEED          = 0x7104,
 
diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index a43ed82..1c234da 100644
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c
@@ -4322,6 +4322,21 @@ hns3_init_hardware(struct hns3_adapter *hns)
 }
 
 static int
+hns3_clear_hw(struct hns3_hw *hw)
+{
+	struct hns3_cmd_desc desc;
+	int ret;
+
+	hns3_cmd_setup_basic_desc(&desc, HNS3_OPC_CLEAR_HW_STATE, false);
+
+	ret = hns3_cmd_send(hw, &desc, 1);
+	if (ret && ret != -EOPNOTSUPP)
+		return ret;
+
+	return 0;
+}
+
+static int
 hns3_init_pf(struct rte_eth_dev *eth_dev)
 {
 	struct rte_device *dev = eth_dev->device;
@@ -4351,6 +4366,18 @@ hns3_init_pf(struct rte_eth_dev *eth_dev)
 		goto err_cmd_init;
 	}
 
+	/*
+	 * To ensure that the hardware environment is clean during
+	 * initialization, the driver actively clear the hardware environment
+	 * during initialization, including PF and corresponding VFs' vlan, mac,
+	 * flow table configurations, etc.
+	 */
+	ret = hns3_clear_hw(hw);
+	if (ret) {
+		PMD_INIT_LOG(ERR, "failed to clear hardware: %d", ret);
+		goto err_cmd_init;
+	}
+
 	ret = rte_intr_callback_register(&pci_dev->intr_handle,
 					 hns3_interrupt_handler,
 					 eth_dev);
-- 
2.7.4