Merge branch 'qed-aer'

Sudarsana Reddy Kalluru says:

====================
qed*: Add support for pcie advanced error recovery.

The patch series adds qed/qede driver changes for PCIe Advanced Error
Recovery (AER) support.
Patch (1) adds qed changes to enable the device to send error messages
to root port when detected.
Patch (2) adds qede support for handling the detected errors (AERs).

Changes from previous version:
-------------------------------
v2: use pci_num_vf() instead of caching the value in edev.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 77 insertions, 1 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index 96356e897c80..38a1d26ca9db 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -49,6 +49,7 @@
 #include <linux/qed/qed_if.h>
 #include <linux/qed/qed_ll2_if.h>
 #include <net/devlink.h>
+#include <linux/aer.h>
 
 #include "qed.h"
 #include "qed_sriov.h"
@@ -129,6 +130,8 @@ static void qed_free_pci(struct qed_dev *cdev)
 {
 	struct pci_dev *pdev = cdev->pdev;
 
+	pci_disable_pcie_error_reporting(pdev);
+
 	if (cdev->doorbells && cdev->db_size)
 		iounmap(cdev->doorbells);
 	if (cdev->regview)
@@ -231,6 +234,12 @@ static int qed_init_pci(struct qed_dev *cdev, struct pci_dev *pdev)
 		return -ENOMEM;
 	}
 
+	/* AER (Advanced Error reporting) configuration */
+	rc = pci_enable_pcie_error_reporting(pdev);
+	if (rc)
+		DP_VERBOSE(cdev, NETIF_MSG_DRV,
+			   "Failed to configure PCIe AER [%d]\n", rc);
+
 	return 0;
 
 err2:
diff --git a/drivers/net/ethernet/qlogic/qede/qede.h b/drivers/net/ethernet/qlogic/qede/qede.h
index 234c6f30effb..1a708f95ce94 100644
--- a/drivers/net/ethernet/qlogic/qede/qede.h
+++ b/drivers/net/ethernet/qlogic/qede/qede.h
@@ -485,6 +485,7 @@ struct qede_fastpath {
 
 #define QEDE_SP_RECOVERY		0
 #define QEDE_SP_RX_MODE			1
+#define QEDE_SP_AER			7
 
 #ifdef CONFIG_RFS_ACCEL
 int qede_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 34fa3917eb33..9b456198cb50 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -60,6 +60,7 @@
 #include <net/ip6_checksum.h>
 #include <linux/bitops.h>
 #include <linux/vmalloc.h>
+#include <linux/aer.h>
 #include "qede.h"
 #include "qede_ptp.h"
 
@@ -124,6 +125,8 @@ static const struct pci_device_id qede_pci_tbl[] = {
 MODULE_DEVICE_TABLE(pci, qede_pci_tbl);
 
 static int qede_probe(struct pci_dev *pdev, const struct pci_device_id *id);
+static pci_ers_result_t
+qede_io_error_detected(struct pci_dev *pdev, pci_channel_state_t state);
 
 #define TX_TIMEOUT		(5 * HZ)
 
@@ -203,6 +206,10 @@ static int qede_sriov_configure(struct pci_dev *pdev, int num_vfs_param)
 }
 #endif
 
+static const struct pci_error_handlers qede_err_handler = {
+	.error_detected = qede_io_error_detected,
+};
+
 static struct pci_driver qede_pci_driver = {
 	.name = "qede",
 	.id_table = qede_pci_tbl,
@@ -212,6 +219,7 @@ static struct pci_driver qede_pci_driver = {
 #ifdef CONFIG_QED_SRIOV
 	.sriov_configure = qede_sriov_configure,
 #endif
+	.err_handler = &qede_err_handler,
 };
 
 static struct qed_eth_cb_ops qede_ll_ops = {
@@ -974,7 +982,8 @@ static void qede_sp_task(struct work_struct *work)
 		/* SRIOV must be disabled outside the lock to avoid a deadlock.
 		 * The recovery of the active VFs is currently not supported.
 		 */
-		qede_sriov_configure(edev->pdev, 0);
+		if (pci_num_vf(edev->pdev))
+			qede_sriov_configure(edev->pdev, 0);
 #endif
 		qede_lock(edev);
 		qede_recovery_handler(edev);
@@ -994,6 +1003,17 @@ static void qede_sp_task(struct work_struct *work)
 	}
 #endif
 	__qede_unlock(edev);
+
+	if (test_and_clear_bit(QEDE_SP_AER, &edev->sp_flags)) {
+#ifdef CONFIG_QED_SRIOV
+		/* SRIOV must be disabled outside the lock to avoid a deadlock.
+		 * The recovery of the active VFs is currently not supported.
+		 */
+		if (pci_num_vf(edev->pdev))
+			qede_sriov_configure(edev->pdev, 0);
+#endif
+		edev->ops->common->recovery_process(edev->cdev);
+	}
 }
 
 static void qede_update_pf_params(struct qed_dev *cdev)
@@ -2579,3 +2599,49 @@ static void qede_get_eth_tlv_data(void *dev, void *data)
 	etlv->num_txqs_full_set = true;
 	etlv->num_rxqs_full_set = true;
 }
+
+/**
+ * qede_io_error_detected - called when PCI error is detected
+ * @pdev: Pointer to PCI device
+ * @state: The current pci connection state
+ *
+ * This function is called after a PCI bus error affecting
+ * this device has been detected.
+ */
+static pci_ers_result_t
+qede_io_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct qede_dev *edev = netdev_priv(dev);
+
+	if (!edev)
+		return PCI_ERS_RESULT_NONE;
+
+	DP_NOTICE(edev, "IO error detected [%d]\n", state);
+
+	__qede_lock(edev);
+	if (edev->state == QEDE_STATE_RECOVERY) {
+		DP_NOTICE(edev, "Device already in the recovery state\n");
+		__qede_unlock(edev);
+		return PCI_ERS_RESULT_NONE;
+	}
+
+	/* PF handles the recovery of its VFs */
+	if (IS_VF(edev)) {
+		DP_VERBOSE(edev, QED_MSG_IOV,
+			   "VF recovery is handled by its PF\n");
+		__qede_unlock(edev);
+		return PCI_ERS_RESULT_RECOVERED;
+	}
+
+	/* Close OS Tx */
+	netif_tx_disable(edev->ndev);
+	netif_carrier_off(edev->ndev);
+
+	set_bit(QEDE_SP_AER, &edev->sp_flags);
+	schedule_delayed_work(&edev->sp_task, 0);
+
+	__qede_unlock(edev);
+
+	return PCI_ERS_RESULT_CAN_RECOVER;
+}