Re: [dpdk-dev] [PATCH v2] net/ixgbe: fix flow ctrl mode setting

["Konieczny, TomaszX" <tomaszx.konieczny@intel.com>]

Patch fixes reported issue.

Tested-by: Tomasz Konieczny <tomaszx.konieczny@intel.com>

Regards
Tomasz Konieczny
---------------------------------------------------------------------
Intel Corporation (UK) Ltd.
Co. Reg. #1134945
Pipers Way, Swindon SN3 1RJ

>Date: Thu, 19 Dec 2019 10:17:58 +0000
>From: Guinan Sun <guinanx.sun@intel.com>
>To: dev@dpdk.org
>Cc: Wenzhuo Lu <wenzhuo.lu@intel.com>, Qiming Yang
>	<qiming.yang@intel.com>, Qi Zhang <qi.z.zhang@intel.com>, Guinan Sun
>	<guinanx.sun@intel.com>, stable@dpdk.org
>Subject: [dpdk-dev] [PATCH v2] net/ixgbe: fix flow ctrl mode setting
>Message-ID: <20191219101758.24608-1-guinanx.sun@intel.com>
>
>When the port starts, the hw register is reset first,
>and then the required parameters are set again.
>If the parameters to be used are not set after resetting the register,
>a read register error will occur. This patch is used to fix the problem.
>
>Fixes: af75078fece3 ("first public release")
>Cc: stable@dpdk.org
>
>Signed-off-by: Guinan Sun <guinanx.sun@intel.com>
>---
>v2: changes
>* Modify the initial value of requested_mode and current_mode
>---
> drivers/net/ixgbe/ixgbe_ethdev.c | 24 ++++++++++++++++++++++--
> drivers/net/ixgbe/ixgbe_ethdev.h |  1 +
> 2 files changed, 23 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
>index 2c6fd0f13..573117e3a 100644
>--- a/drivers/net/ixgbe/ixgbe_ethdev.c
>+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
>@@ -1170,8 +1170,8 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev, void
>*init_params __rte_unused)
> 	memset(dcb_config, 0, sizeof(struct ixgbe_dcb_config));
> 	ixgbe_dcb_init(hw, dcb_config);
> 	/* Get Hardware Flow Control setting */
>-	hw->fc.requested_mode = ixgbe_fc_full;
>-	hw->fc.current_mode = ixgbe_fc_full;
>+	hw->fc.requested_mode = ixgbe_fc_none;
>+	hw->fc.current_mode = ixgbe_fc_none;
> 	hw->fc.pause_time = IXGBE_FC_PAUSE;
> 	for (i = 0; i < IXGBE_DCB_MAX_TRAFFIC_CLASS; i++) {
> 		hw->fc.low_water[i] = IXGBE_FC_LO;
>@@ -2539,6 +2539,7 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
> {
> 	struct ixgbe_hw *hw =
> 		IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
>+	struct ixgbe_adapter *adapter = dev->data->dev_private;
> 	struct ixgbe_vf_info *vfinfo =
> 		*IXGBE_DEV_PRIVATE_TO_P_VFDATA(dev->data->dev_private);
> 	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
>@@ -2555,6 +2556,7 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
> 		IXGBE_DEV_PRIVATE_TO_TM_CONF(dev->data->dev_private);
> 	struct ixgbe_macsec_setting *macsec_setting =
> 		IXGBE_DEV_PRIVATE_TO_MACSEC_SETTING(dev->data-
>>dev_private);
>+	uint32_t mflcn;
>
> 	PMD_INIT_FUNC_TRACE();
>
>@@ -2665,6 +2667,20 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
> 	}
>
> 	ixgbe_restore_statistics_mapping(dev);
>+	err = ixgbe_fc_enable(hw);
>+	if ((err == IXGBE_SUCCESS) || (err ==
>IXGBE_ERR_FC_NOT_NEGOTIATED)) {
>+
>+		mflcn = IXGBE_READ_REG(hw, IXGBE_MFLCN);
>+
>+		/* set or clear MFLCN.PMCF bit depending on configuration */
>+		if (adapter->mac_ctrl_frame_fwd != 0)
>+			mflcn |= IXGBE_MFLCN_PMCF;
>+		else
>+			mflcn &= ~IXGBE_MFLCN_PMCF;
>+
>+		IXGBE_WRITE_REG(hw, IXGBE_MFLCN, mflcn);
>+		IXGBE_WRITE_FLUSH(hw);
>+	}
>
> 	err = ixgbe_dev_rxtx_start(dev);
> 	if (err < 0) {
>@@ -2893,6 +2909,8 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
>
> 	adapter->rss_reta_updated = 0;
>
>+	adapter->mac_ctrl_frame_fwd = 0;
>+
> 	hw->adapter_stopped = true;
> }
>
>@@ -4646,6 +4664,7 @@ static int
> ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
> {
> 	struct ixgbe_hw *hw;
>+	struct ixgbe_adapter *adapter = dev->data->dev_private;
> 	int err;
> 	uint32_t rx_buf_size;
> 	uint32_t max_high_water;
>@@ -4682,6 +4701,7 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct
>rte_eth_fc_conf *fc_conf)
> 	hw->fc.low_water[0]   = fc_conf->low_water;
> 	hw->fc.send_xon       = fc_conf->send_xon;
> 	hw->fc.disable_fc_autoneg = !fc_conf->autoneg;
>+	adapter->mac_ctrl_frame_fwd = fc_conf->mac_ctrl_frame_fwd;
>
> 	err = ixgbe_fc_enable(hw);
>
>diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
>index 76a1b9d18..5af584f9e 100644
>--- a/drivers/net/ixgbe/ixgbe_ethdev.h
>+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
>@@ -510,6 +510,7 @@ struct ixgbe_adapter {
> 	 * mailbox status) link status.
> 	 */
> 	uint8_t pflink_fullchk;
>+	uint8_t mac_ctrl_frame_fwd;
> };
>
> struct ixgbe_vf_representor {
>--
>2.17.1