[dpdk-stable] [PATCH v2] net/i40e: fix link down and negotiation

[Jeff Guo]

[ backported from upstream commit 1bb8f661168d942927cb65e355ec64d4ab195281 ]

Enable the functions set link down and set link up in i40e by check
phy_type, and fix the issue of auto negotiation failed in XXV710 when
bind kernel driver after unbind from DPDK driver by modify the speed
setting distinguish from set link up and down. With this fix, if unbind
DPDK to bind kernel driver, no need to set auto negotiation and ifconfig
up anymore, remove the part from doc.

Fixes: ca7e599d4506 ("net/i40e: fix link management")
Fixes: 2f1e22817420 ("i40e: skip link control as firmware workaround")
Fixes: 6e145fcc754b ("i40e: support autoneg or force link speed")

Signed-off-by: Jeff Guo <jia.guo at intel.com>
Acked-by: Jingjing Wu <jingjing.wu at intel.com>
---
v2->v1: rebase the branch to 16.11
---
 drivers/net/i40e/i40e_ethdev.c | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index f65ddc7..65e10f3 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -1591,11 +1591,15 @@ i40e_parse_link_speeds(uint16_t link_speeds)
 static int
 i40e_phy_conf_link(struct i40e_hw *hw,
 		   uint8_t abilities,
-		   uint8_t force_speed)
+		   uint8_t force_speed,
+		   bool is_up)
 {
 	enum i40e_status_code status;
 	struct i40e_aq_get_phy_abilities_resp phy_ab;
 	struct i40e_aq_set_phy_config phy_conf;
+	enum i40e_aq_phy_type cnt;
+	uint32_t phy_type_mask = 0;
+
 	const uint8_t mask = I40E_AQ_PHY_FLAG_PAUSE_TX |
 			I40E_AQ_PHY_FLAG_PAUSE_RX |
 			I40E_AQ_PHY_FLAG_PAUSE_RX |
@@ -1613,6 +1617,10 @@ i40e_phy_conf_link(struct i40e_hw *hw,
 	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 */
@@ -1623,13 +1631,21 @@ i40e_phy_conf_link(struct i40e_hw *hw,
 	if (abilities & I40E_AQ_PHY_AN_ENABLED)
 		phy_conf.link_speed = advt;
 	else
-		phy_conf.link_speed = force_speed;
+		phy_conf.link_speed = is_up ? force_speed : phy_ab.link_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 = phy_ab.phy_type;
-	phy_conf.phy_type_ext = phy_ab.phy_type_ext;
+	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 |
+		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.mod_type_ext;
 	phy_conf.eee_capability = phy_ab.eee_capability;
 	phy_conf.eeer = phy_ab.eeer_val;
@@ -1661,13 +1677,7 @@ i40e_apply_link_speed(struct rte_eth_dev *dev)
 		abilities |= I40E_AQ_PHY_AN_ENABLED;
 	abilities |= I40E_AQ_PHY_LINK_ENABLED;
 
-	/* Skip changing speed on 40G interfaces, FW does not support */
-	if (I40E_PHY_TYPE_SUPPORT_40G(hw->phy.phy_types)) {
-		speed =  I40E_LINK_SPEED_UNKNOWN;
-		abilities |= I40E_AQ_PHY_AN_ENABLED;
-	}
-
-	return i40e_phy_conf_link(hw, abilities, speed);
+	return i40e_phy_conf_link(hw, abilities, speed, true);
 }
 
 static int
@@ -1992,7 +2002,7 @@ i40e_dev_set_link_down(struct rte_eth_dev *dev)
 	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 
 	abilities = I40E_AQ_PHY_ENABLE_ATOMIC_LINK;
-	return i40e_phy_conf_link(hw, abilities, speed);
+	return i40e_phy_conf_link(hw, abilities, speed, false);
 }
 
 int
-- 
2.7.4