[dpdk-dev] [PATCH 2/6] net/hns3: fix requested FC mode roolback

["Min Hu (Connor)" <humin29@huawei.com>]

From: Huisong Li <lihuisong@huawei.com>

Currently, the "requested_fc_mode" lacks rollback when enabling link
FC or PFC fails. For example, it encounters a reset. This may result
in incorrect FC mode after a reset.

Fixes: d4fdb71a0e7b ("net/hns3: fix flow control mode")
Fixes: 62e3ccc2b94c ("net/hns3: support flow control")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 drivers/net/hns3/hns3_dcb.c    | 30 ++++++++++++++++++++++++++++++
 drivers/net/hns3/hns3_ethdev.c | 28 ----------------------------
 2 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/drivers/net/hns3/hns3_dcb.c b/drivers/net/hns3/hns3_dcb.c
index ab307f1..bea4115 100644
--- a/drivers/net/hns3/hns3_dcb.c
+++ b/drivers/net/hns3/hns3_dcb.c
@@ -1760,6 +1760,30 @@ hns3_dcb_cfg_update(struct hns3_adapter *hns)
 	return ret;
 }
 
+static void
+hns3_get_fc_mode(struct hns3_hw *hw, enum rte_eth_fc_mode mode)
+{
+	switch (mode) {
+	case RTE_FC_NONE:
+		hw->requested_fc_mode = HNS3_FC_NONE;
+		break;
+	case RTE_FC_RX_PAUSE:
+		hw->requested_fc_mode = HNS3_FC_RX_PAUSE;
+		break;
+	case RTE_FC_TX_PAUSE:
+		hw->requested_fc_mode = HNS3_FC_TX_PAUSE;
+		break;
+	case RTE_FC_FULL:
+		hw->requested_fc_mode = HNS3_FC_FULL;
+		break;
+	default:
+		hw->requested_fc_mode = HNS3_FC_NONE;
+		hns3_warn(hw, "fc_mode(%u) exceeds member scope and is "
+			  "configured to RTE_FC_NONE", mode);
+		break;
+	}
+}
+
 /*
  * hns3_dcb_pfc_enable - Enable priority flow control
  * @dev: pointer to ethernet device
@@ -1772,6 +1796,7 @@ hns3_dcb_pfc_enable(struct rte_eth_dev *dev, struct rte_eth_pfc_conf *pfc_conf)
 	struct hns3_hw *hw = HNS3_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	struct hns3_pf *pf = HNS3_DEV_PRIVATE_TO_PF(dev->data->dev_private);
 	enum hns3_fc_status fc_status = hw->current_fc_status;
+	enum hns3_fc_mode old_fc_mode = hw->requested_fc_mode;
 	uint8_t hw_pfc_map = hw->dcb_info.hw_pfc_map;
 	uint8_t pfc_en = hw->dcb_info.pfc_en;
 	uint8_t priority = pfc_conf->priority;
@@ -1779,6 +1804,7 @@ hns3_dcb_pfc_enable(struct rte_eth_dev *dev, struct rte_eth_pfc_conf *pfc_conf)
 	int ret, status;
 
 	pf->pause_time = pfc_conf->fc.pause_time;
+	hns3_get_fc_mode(hw, pfc_conf->fc.mode);
 	hw->current_fc_status = HNS3_FC_STATUS_PFC;
 	hw->dcb_info.pfc_en |= BIT(priority);
 	hw->dcb_info.hw_pfc_map =
@@ -1800,6 +1826,7 @@ hns3_dcb_pfc_enable(struct rte_eth_dev *dev, struct rte_eth_pfc_conf *pfc_conf)
 	return 0;
 
 pfc_setup_fail:
+	hw->requested_fc_mode = old_fc_mode;
 	hw->current_fc_status = fc_status;
 	pf->pause_time = pause_time;
 	hw->dcb_info.pfc_en = pfc_en;
@@ -1822,11 +1849,13 @@ hns3_fc_enable(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
 {
 	struct hns3_hw *hw = HNS3_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	struct hns3_pf *pf = HNS3_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+	enum hns3_fc_mode old_fc_mode = hw->requested_fc_mode;
 	enum hns3_fc_status fc_status = hw->current_fc_status;
 	uint16_t pause_time = pf->pause_time;
 	int ret;
 
 	pf->pause_time = fc_conf->pause_time;
+	hns3_get_fc_mode(hw, fc_conf->mode);
 
 	/*
 	 * In fact, current_fc_status is HNS3_FC_STATUS_NONE when mode
@@ -1846,6 +1875,7 @@ hns3_fc_enable(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
 	return 0;
 
 setup_fc_fail:
+	hw->requested_fc_mode = old_fc_mode;
 	hw->current_fc_status = fc_status;
 	pf->pause_time = pause_time;
 
diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index 0589e3f..f49f220 100644
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c
@@ -6059,30 +6059,6 @@ hns3_flow_ctrl_get(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
 	return 0;
 }
 
-static void
-hns3_get_fc_mode(struct hns3_hw *hw, enum rte_eth_fc_mode mode)
-{
-	switch (mode) {
-	case RTE_FC_NONE:
-		hw->requested_fc_mode = HNS3_FC_NONE;
-		break;
-	case RTE_FC_RX_PAUSE:
-		hw->requested_fc_mode = HNS3_FC_RX_PAUSE;
-		break;
-	case RTE_FC_TX_PAUSE:
-		hw->requested_fc_mode = HNS3_FC_TX_PAUSE;
-		break;
-	case RTE_FC_FULL:
-		hw->requested_fc_mode = HNS3_FC_FULL;
-		break;
-	default:
-		hw->requested_fc_mode = HNS3_FC_NONE;
-		hns3_warn(hw, "fc_mode(%u) exceeds member scope and is "
-			  "configured to RTE_FC_NONE", mode);
-		break;
-	}
-}
-
 static int
 hns3_check_fc_autoneg_valid(struct hns3_hw *hw, uint8_t autoneg)
 {
@@ -6156,8 +6132,6 @@ hns3_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
 		return -EOPNOTSUPP;
 	}
 
-	hns3_get_fc_mode(hw, fc_conf->mode);
-
 	rte_spinlock_lock(&hw->lock);
 	ret = hns3_fc_enable(dev, fc_conf);
 	rte_spinlock_unlock(&hw->lock);
@@ -6204,8 +6178,6 @@ hns3_priority_flow_ctrl_set(struct rte_eth_dev *dev,
 		return -EOPNOTSUPP;
 	}
 
-	hns3_get_fc_mode(hw, pfc_conf->fc.mode);
-
 	rte_spinlock_lock(&hw->lock);
 	ret = hns3_dcb_pfc_enable(dev, pfc_conf);
 	rte_spinlock_unlock(&hw->lock);
-- 
2.7.4