netdev - [net 09/11] ixgbe: fix driver behaviour after issuing VFLR

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Date:   Fri, 24 Aug 2018 11:47:33 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Sebastian Basierski <sebastianx.basierski@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net 09/11] ixgbe: fix driver behaviour after issuing VFLR

From: Sebastian Basierski <sebastianx.basierski@...el.com>

Since VFLR doesn't clear VFMBMEM (VF Mailbox Memory)
and is not re-enabling queues correctly we should fix
this behavior.

Signed-off-by: Sebastian Basierski <sebastianx.basierski@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 .../net/ethernet/intel/ixgbe/ixgbe_sriov.c    | 26 +++++++++++++++++++
 drivers/net/ethernet/intel/ixgbe/ixgbe_type.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index 9264a5f8a5d0..3c6f01c41b78 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -693,8 +693,13 @@ static int ixgbe_set_vf_macvlan(struct ixgbe_adapter *adapter,
 static inline void ixgbe_vf_reset_event(struct ixgbe_adapter *adapter, u32 vf)
 {
 	struct ixgbe_hw *hw = &adapter->hw;
+	struct ixgbe_ring_feature *vmdq = &adapter->ring_feature[RING_F_VMDQ];
 	struct vf_data_storage *vfinfo = &adapter->vfinfo[vf];
+	u32 q_per_pool = __ALIGN_MASK(1, ~vmdq->mask);
 	u8 num_tcs = adapter->hw_tcs;
+	u32 reg_val;
+	u32 queue;
+	u32 word;
 
 	/* remove VLAN filters beloning to this VF */
 	ixgbe_clear_vf_vlans(adapter, vf);
@@ -731,6 +736,27 @@ static inline void ixgbe_vf_reset_event(struct ixgbe_adapter *adapter, u32 vf)
 
 	/* reset VF api back to unknown */
 	adapter->vfinfo[vf].vf_api = ixgbe_mbox_api_10;
+
+	/* Restart each queue for given VF */
+	for (queue = 0; queue < q_per_pool; queue++) {
+		unsigned int reg_idx = (vf * q_per_pool) + queue;
+
+		reg_val = IXGBE_READ_REG(hw, IXGBE_PVFTXDCTL(reg_idx));
+
+		/* Re-enabling only configured queues */
+		if (reg_val) {
+			reg_val |= IXGBE_TXDCTL_ENABLE;
+			IXGBE_WRITE_REG(hw, IXGBE_PVFTXDCTL(reg_idx), reg_val);
+			reg_val &= ~IXGBE_TXDCTL_ENABLE;
+			IXGBE_WRITE_REG(hw, IXGBE_PVFTXDCTL(reg_idx), reg_val);
+		}
+	}
+
+	/* Clear VF's mailbox memory */
+	for (word = 0; word < IXGBE_VFMAILBOX_SIZE; word++)
+		IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf), word, 0);
+
+	IXGBE_WRITE_FLUSH(hw);
 }
 
 static int ixgbe_set_vf_mac(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 44cfb2021145..41bcbb337e83 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -2518,6 +2518,7 @@ enum {
 /* Translated register #defines */
 #define IXGBE_PVFTDH(P)		(0x06010 + (0x40 * (P)))
 #define IXGBE_PVFTDT(P)		(0x06018 + (0x40 * (P)))
+#define IXGBE_PVFTXDCTL(P)	(0x06028 + (0x40 * (P)))
 #define IXGBE_PVFTDWBAL(P)	(0x06038 + (0x40 * (P)))
 #define IXGBE_PVFTDWBAH(P)	(0x0603C + (0x40 * (P)))
 
-- 
2.17.1