3 files changed, 294 insertions, 31 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index c4afb852cb57..7ce42040b851 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -149,6 +149,7 @@ enum i40e_state_t {
 	__I40E_CLIENT_L2_CHANGE,
 	__I40E_CLIENT_RESET,
 	__I40E_VIRTCHNL_OP_PENDING,
+	__I40E_RECOVERY_MODE,
 	/* This must be last as it determines the size of the BITMAP */
 	__I40E_STATE_SIZE__,
 };
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 32e137499063..2c81afbd7c58 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -5141,6 +5141,12 @@ static int i40e_get_module_eeprom(struct net_device *netdev,
 	return 0;
 }
 
+static const struct ethtool_ops i40e_ethtool_recovery_mode_ops = {
+	.set_eeprom		= i40e_set_eeprom,
+	.get_eeprom_len		= i40e_get_eeprom_len,
+	.get_eeprom		= i40e_get_eeprom,
+};
+
 static const struct ethtool_ops i40e_ethtool_ops = {
 	.get_drvinfo		= i40e_get_drvinfo,
 	.get_regs_len		= i40e_get_regs_len,
@@ -5189,5 +5195,11 @@ static const struct ethtool_ops i40e_ethtool_ops = {
 
 void i40e_set_ethtool_ops(struct net_device *netdev)
 {
-	netdev->ethtool_ops = &i40e_ethtool_ops;
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_pf		*pf = np->vsi->back;
+
+	if (!test_bit(__I40E_RECOVERY_MODE, pf->state))
+		netdev->ethtool_ops = &i40e_ethtool_ops;
+	else
+		netdev->ethtool_ops = &i40e_ethtool_recovery_mode_ops;
 }
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index c2673d2cef8e..fa1b2cfd359e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -46,6 +46,10 @@ static int i40e_setup_pf_filter_control(struct i40e_pf *pf);
 static void i40e_prep_for_reset(struct i40e_pf *pf, bool lock_acquired);
 static int i40e_reset(struct i40e_pf *pf);
 static void i40e_rebuild(struct i40e_pf *pf, bool reinit, bool lock_acquired);
+static int i40e_setup_misc_vector_for_recovery_mode(struct i40e_pf *pf);
+static int i40e_restore_interrupt_scheme(struct i40e_pf *pf);
+static bool i40e_check_recovery_mode(struct i40e_pf *pf);
+static int i40e_init_recovery_mode(struct i40e_pf *pf, struct i40e_hw *hw);
 static void i40e_fdir_sb_setup(struct i40e_pf *pf);
 static int i40e_veb_get_bw_info(struct i40e_veb *veb);
 static int i40e_get_capabilities(struct i40e_pf *pf,
@@ -278,8 +282,9 @@ struct i40e_vsi *i40e_find_vsi_from_id(struct i40e_pf *pf, u16 id)
  **/
 void i40e_service_event_schedule(struct i40e_pf *pf)
 {
-	if (!test_bit(__I40E_DOWN, pf->state) &&
-	    !test_bit(__I40E_RESET_RECOVERY_PENDING, pf->state))
+	if ((!test_bit(__I40E_DOWN, pf->state) &&
+	     !test_bit(__I40E_RESET_RECOVERY_PENDING, pf->state)) ||
+	      test_bit(__I40E_RECOVERY_MODE, pf->state))
 		queue_work(i40e_wq, &pf->service_task);
 }
 
@@ -4019,7 +4024,8 @@ static irqreturn_t i40e_intr(int irq, void *data)
 enable_intr:
 	/* re-enable interrupt causes */
 	wr32(hw, I40E_PFINT_ICR0_ENA, ena_mask);
-	if (!test_bit(__I40E_DOWN, pf->state)) {
+	if (!test_bit(__I40E_DOWN, pf->state) ||
+	    test_bit(__I40E_RECOVERY_MODE, pf->state)) {
 		i40e_service_event_schedule(pf);
 		i40e_irq_dynamic_enable_icr0(pf);
 	}
@@ -9409,6 +9415,7 @@ static int i40e_reset(struct i40e_pf *pf)
  **/
 static void i40e_rebuild(struct i40e_pf *pf, bool reinit, bool lock_acquired)
 {
+	int old_recovery_mode_bit = test_bit(__I40E_RECOVERY_MODE, pf->state);
 	struct i40e_vsi *vsi = pf->vsi[pf->lan_vsi];
 	struct i40e_hw *hw = &pf->hw;
 	u8 set_fc_aq_fail = 0;
@@ -9416,7 +9423,14 @@ static void i40e_rebuild(struct i40e_pf *pf, bool reinit, bool lock_acquired)
 	u32 val;
 	int v;
 
-	if (test_bit(__I40E_DOWN, pf->state))
+	if (test_bit(__I40E_EMP_RESET_INTR_RECEIVED, pf->state) &&
+	    i40e_check_recovery_mode(pf)) {
+		i40e_set_ethtool_ops(pf->vsi[pf->lan_vsi]->netdev);
+	}
+
+	if (test_bit(__I40E_DOWN, pf->state) &&
+	    !test_bit(__I40E_RECOVERY_MODE, pf->state) &&
+	    !old_recovery_mode_bit)
 		goto clear_recovery;
 	dev_dbg(&pf->pdev->dev, "Rebuilding internal switch\n");
 
@@ -9445,6 +9459,44 @@ static void i40e_rebuild(struct i40e_pf *pf, bool reinit, bool lock_acquired)
 	if (test_and_clear_bit(__I40E_EMP_RESET_INTR_RECEIVED, pf->state))
 		i40e_verify_eeprom(pf);
 
+	/* if we are going out of or into recovery mode we have to act
+	 * accordingly with regard to resources initialization
+	 * and deinitialization
+	 */
+	if (test_bit(__I40E_RECOVERY_MODE, pf->state) ||
+	    old_recovery_mode_bit) {
+		if (i40e_get_capabilities(pf,
+					  i40e_aqc_opc_list_func_capabilities))
+			goto end_unlock;
+
+		if (test_bit(__I40E_RECOVERY_MODE, pf->state)) {
+			/* we're staying in recovery mode so we'll reinitialize
+			 * misc vector here
+			 */
+			if (i40e_setup_misc_vector_for_recovery_mode(pf))
+				goto end_unlock;
+		} else {
+			if (!lock_acquired)
+				rtnl_lock();
+			/* we're going out of recovery mode so we'll free
+			 * the IRQ allocated specifically for recovery mode
+			 * and restore the interrupt scheme
+			 */
+			free_irq(pf->pdev->irq, pf);
+			i40e_clear_interrupt_scheme(pf);
+			if (i40e_restore_interrupt_scheme(pf))
+				goto end_unlock;
+		}
+
+		/* tell the firmware that we're starting */
+		i40e_send_version(pf);
+
+		/* bail out in case recovery mode was detected, as there is
+		 * no need for further configuration.
+		 */
+		goto end_unlock;
+	}
+
 	i40e_clear_pxe_mode(hw);
 	ret = i40e_get_capabilities(pf, i40e_aqc_opc_list_func_capabilities);
 	if (ret)
@@ -9896,31 +9948,38 @@ static void i40e_service_task(struct work_struct *work)
 	unsigned long start_time = jiffies;
 
 	/* don't bother with service tasks if a reset is in progress */
-	if (test_bit(__I40E_RESET_RECOVERY_PENDING, pf->state))
+	if (test_bit(__I40E_RESET_RECOVERY_PENDING, pf->state) ||
+	    test_bit(__I40E_SUSPENDED, pf->state))
 		return;
 
 	if (test_and_set_bit(__I40E_SERVICE_SCHED, pf->state))
 		return;
 
-	i40e_detect_recover_hung(pf->vsi[pf->lan_vsi]);
-	i40e_sync_filters_subtask(pf);
-	i40e_reset_subtask(pf);
-	i40e_handle_mdd_event(pf);
-	i40e_vc_process_vflr_event(pf);
-	i40e_watchdog_subtask(pf);
-	i40e_fdir_reinit_subtask(pf);
-	if (test_and_clear_bit(__I40E_CLIENT_RESET, pf->state)) {
-		/* Client subtask will reopen next time through. */
-		i40e_notify_client_of_netdev_close(pf->vsi[pf->lan_vsi], true);
+	if (!test_bit(__I40E_RECOVERY_MODE, pf->state)) {
+		i40e_detect_recover_hung(pf->vsi[pf->lan_vsi]);
+		i40e_sync_filters_subtask(pf);
+		i40e_reset_subtask(pf);
+		i40e_handle_mdd_event(pf);
+		i40e_vc_process_vflr_event(pf);
+		i40e_watchdog_subtask(pf);
+		i40e_fdir_reinit_subtask(pf);
+		if (test_and_clear_bit(__I40E_CLIENT_RESET, pf->state)) {
+			/* Client subtask will reopen next time through. */
+			i40e_notify_client_of_netdev_close(pf->vsi[pf->lan_vsi],
+							   true);
+		} else {
+			i40e_client_subtask(pf);
+			if (test_and_clear_bit(__I40E_CLIENT_L2_CHANGE,
+					       pf->state))
+				i40e_notify_client_of_l2_param_changes(
+								pf->vsi[pf->lan_vsi]);
+		}
+		i40e_sync_filters_subtask(pf);
+		i40e_sync_udp_filters_subtask(pf);
 	} else {
-		i40e_client_subtask(pf);
-		if (test_and_clear_bit(__I40E_CLIENT_L2_CHANGE,
-				       pf->state))
-			i40e_notify_client_of_l2_param_changes(
-							pf->vsi[pf->lan_vsi]);
-	}
-	i40e_sync_filters_subtask(pf);
-	i40e_sync_udp_filters_subtask(pf);
+		i40e_reset_subtask(pf);
+	}
+
 	i40e_clean_adminq_subtask(pf);
 
 	/* flush memory to make sure state is correct before next watchdog */
@@ -10743,6 +10802,48 @@ err_unwind:
 }
 
 /**
+ * i40e_setup_misc_vector_for_recovery_mode - Setup the misc vector to handle
+ * non queue events in recovery mode
+ * @pf: board private structure
+ *
+ * This sets up the handler for MSIX 0 or MSI/legacy, which is used to manage
+ * the non-queue interrupts, e.g. AdminQ and errors in recovery mode.
+ * This is handled differently than in recovery mode since no Tx/Rx resources
+ * are being allocated.
+ **/
+static int i40e_setup_misc_vector_for_recovery_mode(struct i40e_pf *pf)
+{
+	int err;
+
+	if (pf->flags & I40E_FLAG_MSIX_ENABLED) {
+		err = i40e_setup_misc_vector(pf);
+
+		if (err) {
+			dev_info(&pf->pdev->dev,
+				 "MSI-X misc vector request failed, error %d\n",
+				 err);
+			return err;
+		}
+	} else {
+		u32 flags = pf->flags & I40E_FLAG_MSI_ENABLED ? 0 : IRQF_SHARED;
+
+		err = request_irq(pf->pdev->irq, i40e_intr, flags,
+				  pf->int_name, pf);
+
+		if (err) {
+			dev_info(&pf->pdev->dev,
+				 "MSI/legacy misc vector request failed, error %d\n",
+				 err);
+			return err;
+		}
+		i40e_enable_misc_int_causes(pf);
+		i40e_irq_dynamic_enable_icr0(pf);
+	}
+
+	return 0;
+}
+
+/**
  * i40e_setup_misc_vector - Setup the misc vector to handle non queue events
  * @pf: board private structure
  *
@@ -13905,6 +14006,125 @@ void i40e_set_fec_in_flags(u8 fec_cfg, u32 *flags)
 }
 
 /**
+ * i40e_check_recovery_mode - check if we are running transition firmware
+ * @pf: board private structure
+ *
+ * Check registers indicating the firmware runs in recovery mode. Sets the
+ * appropriate driver state.
+ *
+ * Returns true if the recovery mode was detected, false otherwise
+ **/
+static bool i40e_check_recovery_mode(struct i40e_pf *pf)
+{
+	u32 val = rd32(&pf->hw, I40E_GL_FWSTS);
+
+	if (val & I40E_GL_FWSTS_FWS1B_MASK) {
+		dev_notice(&pf->pdev->dev, "Firmware recovery mode detected. Limiting functionality.\n");
+		dev_notice(&pf->pdev->dev, "Refer to the Intel(R) Ethernet Adapters and Devices User Guide for details on firmware recovery mode.\n");
+		set_bit(__I40E_RECOVERY_MODE, pf->state);
+
+		return true;
+	}
+	if (test_and_clear_bit(__I40E_RECOVERY_MODE, pf->state))
+		dev_info(&pf->pdev->dev, "Reinitializing in normal mode with full functionality.\n");
+
+	return false;
+}
+
+/**
+ * i40e_init_recovery_mode - initialize subsystems needed in recovery mode
+ * @pf: board private structure
+ * @hw: ptr to the hardware info
+ *
+ * This function does a minimal setup of all subsystems needed for running
+ * recovery mode.
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int i40e_init_recovery_mode(struct i40e_pf *pf, struct i40e_hw *hw)
+{
+	struct i40e_vsi *vsi;
+	int err;
+	int v_idx;
+
+	pci_save_state(pf->pdev);
+
+	/* set up periodic task facility */
+	timer_setup(&pf->service_timer, i40e_service_timer, 0);
+	pf->service_timer_period = HZ;
+
+	INIT_WORK(&pf->service_task, i40e_service_task);
+	clear_bit(__I40E_SERVICE_SCHED, pf->state);
+
+	err = i40e_init_interrupt_scheme(pf);
+	if (err)
+		goto err_switch_setup;
+
+	/* The number of VSIs reported by the FW is the minimum guaranteed
+	 * to us; HW supports far more and we share the remaining pool with
+	 * the other PFs. We allocate space for more than the guarantee with
+	 * the understanding that we might not get them all later.
+	 */
+	if (pf->hw.func_caps.num_vsis < I40E_MIN_VSI_ALLOC)
+		pf->num_alloc_vsi = I40E_MIN_VSI_ALLOC;
+	else
+		pf->num_alloc_vsi = pf->hw.func_caps.num_vsis;
+
+	/* Set up the vsi struct and our local tracking of the MAIN PF vsi. */
+	pf->vsi = kcalloc(pf->num_alloc_vsi, sizeof(struct i40e_vsi *),
+			  GFP_KERNEL);
+	if (!pf->vsi) {
+		err = -ENOMEM;
+		goto err_switch_setup;
+	}
+
+	/* We allocate one VSI which is needed as absolute minimum
+	 * in order to register the netdev
+	 */
+	v_idx = i40e_vsi_mem_alloc(pf, I40E_VSI_MAIN);
+	if (v_idx < 0)
+		goto err_switch_setup;
+	pf->lan_vsi = v_idx;
+	vsi = pf->vsi[v_idx];
+	if (!vsi)
+		goto err_switch_setup;
+	vsi->alloc_queue_pairs = 1;
+	err = i40e_config_netdev(vsi);
+	if (err)
+		goto err_switch_setup;
+	err = register_netdev(vsi->netdev);
+	if (err)
+		goto err_switch_setup;
+	vsi->netdev_registered = true;
+	i40e_dbg_pf_init(pf);
+
+	err = i40e_setup_misc_vector_for_recovery_mode(pf);
+	if (err)
+		goto err_switch_setup;
+
+	/* tell the firmware that we're starting */
+	i40e_send_version(pf);
+
+	/* since everything's happy, start the service_task timer */
+	mod_timer(&pf->service_timer,
+		  round_jiffies(jiffies + pf->service_timer_period));
+
+	return 0;
+
+err_switch_setup:
+	i40e_reset_interrupt_capability(pf);
+	del_timer_sync(&pf->service_timer);
+	i40e_shutdown_adminq(hw);
+	iounmap(hw->hw_addr);
+	pci_disable_pcie_error_reporting(pf->pdev);
+	pci_release_mem_regions(pf->pdev);
+	pci_disable_device(pf->pdev);
+	kfree(pf);
+
+	return err;
+}
+
+/**
  * i40e_probe - Device initialization routine
  * @pdev: PCI device information struct
  * @ent: entry in i40e_pci_tbl
@@ -14029,13 +14249,14 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	/* Reset here to make sure all is clean and to define PF 'n' */
 	i40e_clear_hw(hw);
-	err = i40e_pf_reset(hw);
-	if (err) {
-		dev_info(&pdev->dev, "Initial pf_reset failed: %d\n", err);
-		goto err_pf_reset;
+	if (!i40e_check_recovery_mode(pf)) {
+		err = i40e_pf_reset(hw);
+		if (err) {
+			dev_info(&pdev->dev, "Initial pf_reset failed: %d\n", err);
+			goto err_pf_reset;
+		}
+		pf->pfr_count++;
 	}
-	pf->pfr_count++;
-
 	hw->aq.num_arq_entries = I40E_AQ_LEN;
 	hw->aq.num_asq_entries = I40E_AQ_LEN;
 	hw->aq.arq_buf_size = I40E_MAX_AQ_BUF_SIZE;
@@ -14103,6 +14324,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		dev_warn(&pdev->dev, "This device is a pre-production adapter/LOM. Please be aware there may be issues with your hardware. If you are experiencing problems please contact your Intel or hardware representative who provided you with this hardware.\n");
 
 	i40e_clear_pxe_mode(hw);
+
 	err = i40e_get_capabilities(pf, i40e_aqc_opc_list_func_capabilities);
 	if (err)
 		goto err_adminq_setup;
@@ -14113,6 +14335,9 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err_sw_init;
 	}
 
+	if (test_bit(__I40E_RECOVERY_MODE, pf->state))
+		return i40e_init_recovery_mode(pf, hw);
+
 	err = i40e_init_lan_hmc(hw, hw->func_caps.num_tx_qp,
 				hw->func_caps.num_rx_qp, 0, 0);
 	if (err) {
@@ -14498,6 +14723,19 @@ static void i40e_remove(struct pci_dev *pdev)
 	if (pf->service_task.func)
 		cancel_work_sync(&pf->service_task);
 
+	if (test_bit(__I40E_RECOVERY_MODE, pf->state)) {
+		struct i40e_vsi *vsi = pf->vsi[0];
+
+		/* We know that we have allocated only one vsi for this PF,
+		 * it was just for registering netdevice, so the interface
+		 * could be visible in the 'ifconfig' output
+		 */
+		unregister_netdev(vsi->netdev);
+		free_netdev(vsi->netdev);
+
+		goto unmap;
+	}
+
 	/* Client close must be called explicitly here because the timer
 	 * has been stopped.
 	 */
@@ -14547,6 +14785,12 @@ static void i40e_remove(struct pci_dev *pdev)
 				 ret_code);
 	}
 
+unmap:
+	/* Free MSI/legacy interrupt 0 when in recovery mode. */
+	if (test_bit(__I40E_RECOVERY_MODE, pf->state) &&
+	    !(pf->flags & I40E_FLAG_MSIX_ENABLED))
+		free_irq(pf->pdev->irq, pf);
+
 	/* shutdown the adminq */
 	i40e_shutdown_adminq(hw);
 
@@ -14559,7 +14803,8 @@ static void i40e_remove(struct pci_dev *pdev)
 	i40e_clear_interrupt_scheme(pf);
 	for (i = 0; i < pf->num_alloc_vsi; i++) {
 		if (pf->vsi[i]) {
-			i40e_vsi_clear_rings(pf->vsi[i]);
+			if (!test_bit(__I40E_RECOVERY_MODE, pf->state))
+				i40e_vsi_clear_rings(pf->vsi[i]);
 			i40e_vsi_clear(pf->vsi[i]);
 			pf->vsi[i] = NULL;
 		}
@@ -14767,6 +15012,11 @@ static void i40e_shutdown(struct pci_dev *pdev)
 	wr32(hw, I40E_PFPM_WUFC,
 	     (pf->wol_en ? I40E_PFPM_WUFC_MAG_MASK : 0));
 
+	/* Free MSI/legacy interrupt 0 when in recovery mode. */
+	if (test_bit(__I40E_RECOVERY_MODE, pf->state) &&
+	    !(pf->flags & I40E_FLAG_MSIX_ENABLED))
+		free_irq(pf->pdev->irq, pf);
+
 	/* Since we're going to destroy queues during the
 	 * i40e_clear_interrupt_scheme() we should hold the RTNL lock for this
 	 * whole section