[Intel-wired-lan] [iwl-next v1 2/4] ixgbe: check for MDD events

[Michal Swiatkowski <michal.swiatkowski@linux.intel.com>]

From: Don Skidmore <donald.c.skidmore@intel.com>

When an event is detected it is logged and, for the time being, the
queue is immediately re-enabled.  This is due to the lack of an API
to the hypervisor so it could deal with it as it chooses.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Reviewed-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
---
 .../net/ethernet/intel/ixgbe/ixgbe_sriov.h    |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_type.h |  2 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  3 ++
 .../net/ethernet/intel/ixgbe/ixgbe_sriov.c    | 50 +++++++++++++++++++
 4 files changed, 56 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h
index 0690ecb8dfa3..bc4cab976bf9 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h
@@ -15,6 +15,7 @@
 #ifdef CONFIG_PCI_IOV
 void ixgbe_restore_vf_multicasts(struct ixgbe_adapter *adapter);
 #endif
+bool ixgbe_check_mdd_event(struct ixgbe_adapter *adapter);
 void ixgbe_msg_task(struct ixgbe_adapter *adapter);
 int ixgbe_vf_configuration(struct pci_dev *pdev, unsigned int event_mask);
 void ixgbe_ping_all_vfs(struct ixgbe_adapter *adapter);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index d446c375335a..aa3b498558bc 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -402,6 +402,8 @@ struct ixgbe_nvm_version {
 #define IXGBE_MRCTL(_i)      (0x0F600 + ((_i) * 4))
 #define IXGBE_VMRVLAN(_i)    (0x0F610 + ((_i) * 4))
 #define IXGBE_VMRVM(_i)      (0x0F630 + ((_i) * 4))
+#define IXGBE_LVMMC_RX	     0x2FA8
+#define IXGBE_LVMMC_TX	     0x8108
 #define IXGBE_WQBR_RX(_i)    (0x2FB0 + ((_i) * 4)) /* 4 total */
 #define IXGBE_WQBR_TX(_i)    (0x8130 + ((_i) * 4)) /* 4 total */
 #define IXGBE_L34T_IMIR(_i)  (0x0E800 + ((_i) * 4)) /*128 of these (0-127)*/
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 467f81239e12..3ff48207165c 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7959,6 +7959,9 @@ static void ixgbe_watchdog_link_is_up(struct ixgbe_adapter *adapter)
 	netif_carrier_on(netdev);
 	ixgbe_check_vf_rate_limit(adapter);
 
+	if (adapter->num_vfs && hw->mac.ops.enable_mdd)
+		hw->mac.ops.enable_mdd(hw);
+
 	/* enable transmits */
 	netif_tx_wake_all_queues(adapter->netdev);
 
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index ccdce80edd14..c374ebd4a56b 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -207,6 +207,7 @@ void ixgbe_enable_sriov(struct ixgbe_adapter *adapter, unsigned int max_vfs)
 int ixgbe_disable_sriov(struct ixgbe_adapter *adapter)
 {
 	unsigned int num_vfs = adapter->num_vfs, vf;
+	struct ixgbe_hw *hw = &adapter->hw;
 	unsigned long flags;
 	int rss;
 
@@ -237,6 +238,9 @@ int ixgbe_disable_sriov(struct ixgbe_adapter *adapter)
 	if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED))
 		return 0;
 
+	if (hw->mac.ops.disable_mdd)
+		hw->mac.ops.disable_mdd(hw);
+
 #ifdef CONFIG_PCI_IOV
 	/*
 	 * If our VFs are assigned we cannot shut down SR-IOV
@@ -1353,12 +1357,58 @@ static void ixgbe_rcv_ack_from_vf(struct ixgbe_adapter *adapter, u32 vf)
 		ixgbe_write_mbx(hw, &msg, 1, vf);
 }
 
+/**
+ * ixgbe_check_mdd_event - check for MDD event on all VFs
+ * @adapter: pointer to ixgbe adapter
+ *
+ * Return: true if there is a VF on which MDD event occurred, false otherwise.
+ */
+bool ixgbe_check_mdd_event(struct ixgbe_adapter *adapter)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	DECLARE_BITMAP(vf_bitmap, 64);
+	bool ret = false;
+	int i;
+
+	if (!hw->mac.ops.handle_mdd)
+		return false;
+
+	/* Did we have a malicious event */
+	hw->mac.ops.handle_mdd(hw, vf_bitmap);
+
+	/* Log any blocked queues and release lock */
+	for_each_set_bit(i, vf_bitmap, 64) {
+		dev_warn(&adapter->pdev->dev,
+			 "Malicious event on VF %d tx:%x rx:%x\n", i,
+			 IXGBE_READ_REG(hw, IXGBE_LVMMC_TX),
+			 IXGBE_READ_REG(hw, IXGBE_LVMMC_RX));
+
+		if (hw->mac.ops.restore_mdd_vf) {
+			u32 ping;
+
+			hw->mac.ops.restore_mdd_vf(hw, i);
+
+			/* get the VF to rebuild its queues */
+			adapter->vfinfo[i].clear_to_send = 0;
+			ping = IXGBE_PF_CONTROL_MSG |
+			       IXGBE_VT_MSGTYPE_CTS;
+			ixgbe_write_mbx(hw, &ping, 1, i);
+		}
+
+		ret = true;
+	}
+
+	return ret;
+}
+
 void ixgbe_msg_task(struct ixgbe_adapter *adapter)
 {
 	struct ixgbe_hw *hw = &adapter->hw;
 	unsigned long flags;
 	u32 vf;
 
+	ixgbe_check_mdd_event(adapter);
+
 	spin_lock_irqsave(&adapter->vfs_lock, flags);
 	for (vf = 0; vf < adapter->num_vfs; vf++) {
 		/* process any reset requests */
-- 
2.42.0