ice: Set physical link up/down when an interface is set up/down

When a netdev is set up/down we need to set the phsyical link state
accordingly. This patch adds that functionality by calling
ice_force_phys_link_state(vsi, link_up) in both the ice_stop() and
ice_open() paths.

In order to force link, ice_force_phys_link_state(vsi, link_up) will
first determine the current phy capabilities. If link has not changed
there is nothing to do. If link has changed, previous PHY capabilities
are saved and the "Enable Automatic Link Update" and "Link Establishment
State Machine (LESM)" enable bits are set. Then the new PHY config is
saved. The "Enable Automatic Link Update" will force the FW to execute
Setup link and restart auto-negotiation. This *should* then result in a
"Link Status Event (LSE)" which will cause the driver to get the current
link status.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ice/ice_adminq_cmd.h

@@ -851,7 +851,7 @@ struct ice_aqc_get_phy_caps {
 
 struct ice_aqc_get_phy_caps_data {
 	__le64 phy_type_low; /* Use values from ICE_PHY_TYPE_LOW_* */
-	__le64 reserved;
+	__le64 phy_type_high; /* Use values from ICE_PHY_TYPE_HIGH_* */
 	u8 caps;
 #define ICE_AQC_PHY_EN_TX_LINK_PAUSE			BIT(0)
 #define ICE_AQC_PHY_EN_RX_LINK_PAUSE			BIT(1)
@@ -916,7 +916,7 @@ struct ice_aqc_set_phy_cfg {
 /* Set PHY config command data structure */
 struct ice_aqc_set_phy_cfg_data {
 	__le64 phy_type_low; /* Use values from ICE_PHY_TYPE_LOW_* */
-	__le64 rsvd0;
+	__le64 phy_type_high; /* Use values from ICE_PHY_TYPE_HIGH_* */
 	u8 caps;
 #define ICE_AQ_PHY_ENA_TX_PAUSE_ABILITY		BIT(0)
 #define ICE_AQ_PHY_ENA_RX_PAUSE_ABILITY		BIT(1)

drivers/net/ethernet/intel/ice/ice_main.c

@@ -2944,13 +2944,92 @@ static void ice_napi_disable_all(struct ice_vsi *vsi)
 	}
 }
 
+/**
+ * ice_force_phys_link_state - Force the physical link state
+ * @vsi: VSI to force the physical link state to up/down
+ * @link_up: true/false indicates to set the physical link to up/down
+ *
+ * Force the physical link state by getting the current PHY capabilities from
+ * hardware and setting the PHY config based on the determined capabilities. If
+ * link changes a link event will be triggered because both the Enable Automatic
+ * Link Update and LESM Enable bits are set when setting the PHY capabilities.
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int ice_force_phys_link_state(struct ice_vsi *vsi, bool link_up)
+{
+	struct ice_aqc_get_phy_caps_data *pcaps;
+	struct ice_aqc_set_phy_cfg_data *cfg;
+	struct ice_port_info *pi;
+	struct device *dev;
+	int retcode;
+
+	if (!vsi || !vsi->port_info || !vsi->back)
+		return -EINVAL;
+	if (vsi->type != ICE_VSI_PF)
+		return 0;
+
+	dev = &vsi->back->pdev->dev;
+
+	pi = vsi->port_info;
+
+	pcaps = devm_kzalloc(dev, sizeof(*pcaps), GFP_KERNEL);
+	if (!pcaps)
+		return -ENOMEM;
+
+	retcode = ice_aq_get_phy_caps(pi, false, ICE_AQC_REPORT_SW_CFG, pcaps,
+				      NULL);
+	if (retcode) {
+		dev_err(dev,
+			"Failed to get phy capabilities, VSI %d error %d\n",
+			vsi->vsi_num, retcode);
+		retcode = -EIO;
+		goto out;
+	}
+
+	/* No change in link */
+	if (link_up == !!(pcaps->caps & ICE_AQC_PHY_EN_LINK) &&
+	    link_up == !!(pi->phy.link_info.link_info & ICE_AQ_LINK_UP))
+		goto out;
+
+	cfg = devm_kzalloc(dev, sizeof(*cfg), GFP_KERNEL);
+	if (!cfg) {
+		retcode = -ENOMEM;
+		goto out;
+	}
+
+	cfg->phy_type_low = pcaps->phy_type_low;
+	cfg->phy_type_high = pcaps->phy_type_high;
+	cfg->caps = pcaps->caps | ICE_AQ_PHY_ENA_AUTO_LINK_UPDT;
+	cfg->low_power_ctrl = pcaps->low_power_ctrl;
+	cfg->eee_cap = pcaps->eee_cap;
+	cfg->eeer_value = pcaps->eeer_value;
+	cfg->link_fec_opt = pcaps->link_fec_options;
+	if (link_up)
+		cfg->caps |= ICE_AQ_PHY_ENA_LINK;
+	else
+		cfg->caps &= ~ICE_AQ_PHY_ENA_LINK;
+
+	retcode = ice_aq_set_phy_cfg(&vsi->back->hw, pi->lport, cfg, NULL);
+	if (retcode) {
+		dev_err(dev, "Failed to set phy config, VSI %d error %d\n",
+			vsi->vsi_num, retcode);
+		retcode = -EIO;
+	}
+
+	devm_kfree(dev, cfg);
+out:
+	devm_kfree(dev, pcaps);
+	return retcode;
+}
+
 /**
  * ice_down - Shutdown the connection
  * @vsi: The VSI being stopped
  */
 int ice_down(struct ice_vsi *vsi)
 {
-	int i, tx_err, rx_err;
+	int i, tx_err, rx_err, link_err;
 
 	/* Caller of this function is expected to set the
 	 * vsi->state __ICE_DOWN bit
@@ -2975,13 +3054,19 @@ int ice_down(struct ice_vsi *vsi)
 
 	ice_napi_disable_all(vsi);
 
+	link_err = ice_force_phys_link_state(vsi, false);
+	if (link_err)
+		netdev_err(vsi->netdev,
+			   "Failed to set physical link down, VSI %d error %d\n",
+			   vsi->vsi_num, link_err);
+
 	ice_for_each_txq(vsi, i)
 		ice_clean_tx_ring(vsi->tx_rings[i]);
 
 	ice_for_each_rxq(vsi, i)
 		ice_clean_rx_ring(vsi->rx_rings[i]);
 
-	if (tx_err || rx_err) {
+	if (tx_err || rx_err || link_err) {
 		netdev_err(vsi->netdev,
 			   "Failed to close VSI 0x%04X on switch 0x%04X\n",
 			   vsi->vsi_num, vsi->vsw->sw_id);
@@ -3815,8 +3900,14 @@ static int ice_open(struct net_device *netdev)
 
 	netif_carrier_off(netdev);
 
-	err = ice_vsi_open(vsi);
+	err = ice_force_phys_link_state(vsi, true);
+	if (err) {
+		netdev_err(netdev,
+			   "Failed to set physical link up, error %d\n", err);
+		return err;
+	}
 
+	err = ice_vsi_open(vsi);
 	if (err)
 		netdev_err(netdev, "Failed to open VSI 0x%04X on switch 0x%04X\n",
 			   vsi->vsi_num, vsi->vsw->sw_id);