[dpdk-dev] [PATCH] net/i40e: fix link up failure issue

[Jeff Guo <jia.guo@intel.com>]

If don't enable auto negotiation when set PHY to be link down, will cause
PHY can’t be Link up again in some case, this patch aim to fix this
issue.  When rebind to kernel driver, it can use ethtool to set auto
negotiation and use ifconfig tool to link up the device. And for the
case of PHY config synchronous compatibility with kernel driver issue,
that is known issue and work around it by don't config PHY when stop
device.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 48 ++++++++++++++++++++++++------------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 014bfce..accfc05 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2039,16 +2039,11 @@ i40e_phy_conf_link(struct i40e_hw *hw,
 			I40E_LINK_SPEED_100MB;
 	int ret = -ENOTSUP;
 
-
 	status = i40e_aq_get_phy_capabilities(hw, false, false, &phy_ab,
 					      NULL);
 	if (status)
 		return ret;
 
-	/* If link already up, no need to set up again */
-	if (is_up && phy_ab.phy_type != 0)
-		return I40E_SUCCESS;
-
 	memset(&phy_conf, 0, sizeof(phy_conf));
 
 	/* bits 0-2 use the values from get_phy_abilities_resp */
@@ -2056,25 +2051,27 @@ i40e_phy_conf_link(struct i40e_hw *hw,
 	abilities |= phy_ab.abilities & mask;
 
 	/* update ablities and speed */
-	if (abilities & I40E_AQ_PHY_AN_ENABLED)
+	if (abilities & I40E_AQ_PHY_AN_ENABLED && is_up) {
+		if (phy_ab.link_speed != I40E_LINK_SPEED_UNKNOWN)
+			return I40E_SUCCESS;
 		phy_conf.link_speed = advt;
-	else
-		phy_conf.link_speed = is_up ? force_speed : phy_ab.link_speed;
-
+	} else {
+		phy_conf.link_speed = force_speed;
+	}
 	phy_conf.abilities = abilities;
 
-
-
 	/* To enable link, phy_type mask needs to include each type */
 	for (cnt = I40E_PHY_TYPE_SGMII; cnt < I40E_PHY_TYPE_MAX; cnt++)
 		phy_type_mask |= 1 << cnt;
 
 	/* use get_phy_abilities_resp value for the rest */
-	phy_conf.phy_type = is_up ? cpu_to_le32(phy_type_mask) : 0;
-	phy_conf.phy_type_ext = is_up ? (I40E_AQ_PHY_TYPE_EXT_25G_KR |
+	phy_conf.phy_type = cpu_to_le32(phy_type_mask);
+	phy_conf.phy_type_ext = I40E_AQ_PHY_TYPE_EXT_25G_KR |
 		I40E_AQ_PHY_TYPE_EXT_25G_CR | I40E_AQ_PHY_TYPE_EXT_25G_SR |
-		I40E_AQ_PHY_TYPE_EXT_25G_LR) : 0;
-	phy_conf.fec_config = phy_ab.fec_cfg_curr_mod_ext_info;
+		I40E_AQ_PHY_TYPE_EXT_25G_LR | I40E_AQ_PHY_TYPE_EXT_25G_AOC |
+		I40E_AQ_PHY_TYPE_EXT_25G_ACC;
+	phy_conf.fec_config = phy_ab.fec_cfg_curr_mod_ext_info |
+		I40E_AQ_PHY_FEC_CONFIG_MASK;
 	phy_conf.eee_capability = phy_ab.eee_capability;
 	phy_conf.eeer = phy_ab.eeer_val;
 	phy_conf.low_power_ctrl = phy_ab.d3_lpan;
@@ -2088,6 +2085,20 @@ i40e_phy_conf_link(struct i40e_hw *hw,
 	if (status)
 		return ret;
 
+	/* Update the link info */
+	status = i40e_update_link_info(hw);
+	if (status) {
+		/**
+		 * Wait a little bit (on 40G cards it sometimes takes a really
+		 * long time for link to come back from the atomic reset)
+		 * and try once more.
+		 */
+		msleep(1000);
+		status = i40e_update_link_info(hw);
+	}
+	if (status)
+		return ret;
+
 	return I40E_SUCCESS;
 }
 
@@ -2103,7 +2114,6 @@ i40e_apply_link_speed(struct rte_eth_dev *dev)
 	abilities |= I40E_AQ_PHY_ENABLE_ATOMIC_LINK;
 	if (!(conf->link_speeds & ETH_LINK_SPEED_FIXED))
 		abilities |= I40E_AQ_PHY_AN_ENABLED;
-	abilities |= I40E_AQ_PHY_LINK_ENABLED;
 
 	return i40e_phy_conf_link(hw, abilities, speed, true);
 }
@@ -2306,9 +2316,6 @@ i40e_dev_stop(struct rte_eth_dev *dev)
 	/* Clear all queues and release memory */
 	i40e_dev_clear_queues(dev);
 
-	/* Set link down */
-	i40e_dev_set_link_down(dev);
-
 	if (!rte_intr_allow_others(intr_handle))
 		/* resume to the default handler */
 		rte_intr_callback_register(intr_handle,
@@ -2516,7 +2523,8 @@ i40e_dev_set_link_down(struct rte_eth_dev *dev)
 	uint8_t abilities = 0;
 	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 
-	abilities = I40E_AQ_PHY_ENABLE_ATOMIC_LINK;
+	abilities = I40E_AQ_PHY_ENABLE_AN;
+	abilities |= I40E_AQ_PHY_ENABLE_ATOMIC_LINK;
 	return i40e_phy_conf_link(hw, abilities, speed, false);
 }
 
-- 
2.7.4