[net-2.6 PATCH 1/2] igb: fix handling of mailbox collisions between PF/VF

[net-2.6 PATCH 1/2] igb: fix handling of mailbox collisions between PF/VF

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This patch changes the handling of collisions between the use of the PF/VF
sides of the mailbox.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/igb/igb_main.c |   22 +++++++++++++---------
 1 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 16349ba..78963a0 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -4608,8 +4608,14 @@ static void igb_rcv_msg_from_vf(struct igb_adapter *adapter, u32 vf)
 
 	retval = igb_read_mbx(hw, msgbuf, E1000_VFMAILBOX_SIZE, vf);
 
-	if (retval)
+	if (retval) {
+		/* if receive failed revoke VF CTS stats and restart init */
 		dev_err(&pdev->dev, "Error receiving message from VF\n");
+		vf_data->flags &= ~IGB_VF_FLAG_CTS;
+		if (!time_after(jiffies, vf_data->last_nack + (2 * HZ)))
+			return;
+		goto out;
+	}
 
 	/* this is a message we already processed, do nothing */
 	if (msgbuf[0] & (E1000_VT_MSGTYPE_ACK | E1000_VT_MSGTYPE_NACK))
@@ -4626,12 +4632,10 @@ static void igb_rcv_msg_from_vf(struct igb_adapter *adapter, u32 vf)
 	}
 
 	if (!(vf_data->flags & IGB_VF_FLAG_CTS)) {
-		msgbuf[0] = E1000_VT_MSGTYPE_NACK;
-		if (time_after(jiffies, vf_data->last_nack + (2 * HZ))) {
-			igb_write_mbx(hw, msgbuf, 1, vf);
-			vf_data->last_nack = jiffies;
-		}
-		return;
+		if (!time_after(jiffies, vf_data->last_nack + (2 * HZ)))
+			return;
+		retval = -1;
+		goto out;
 	}
 
 	switch ((msgbuf[0] & 0xFFFF)) {
@@ -4656,14 +4660,14 @@ static void igb_rcv_msg_from_vf(struct igb_adapter *adapter, u32 vf)
 		break;
 	}
 
+	msgbuf[0] |= E1000_VT_MSGTYPE_CTS;
+out:
 	/* notify the VF of the results of what it sent us */
 	if (retval)
 		msgbuf[0] |= E1000_VT_MSGTYPE_NACK;
 	else
 		msgbuf[0] |= E1000_VT_MSGTYPE_ACK;
 
-	msgbuf[0] |= E1000_VT_MSGTYPE_CTS;
-
 	igb_write_mbx(hw, msgbuf, 1, vf);
 }
 

[net-2.6 PATCH 2/2] igbvf: avoid reset storms due to mailbox issues

[Jeff Kirsher]

From: Alexander Duyck <alexander.h.duyck@intel.com>

This change makes it so that reset/interrupt storms can be avoided when
there are mailbox issues.  The new behavior is to only allow the device to
trigger mailbox related resets only once every 10 seconds.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/igbvf/igbvf.h  |    1 +
 drivers/net/igbvf/netdev.c |    8 +++++++-
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/net/igbvf/igbvf.h b/drivers/net/igbvf/igbvf.h
index 3d1ee7a..a1774b2 100644
--- a/drivers/net/igbvf/igbvf.h
+++ b/drivers/net/igbvf/igbvf.h
@@ -276,6 +276,7 @@ struct igbvf_adapter {
 	unsigned long led_status;
 
 	unsigned int flags;
+	unsigned long last_reset;
 };
 
 struct igbvf_info {
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index a127620..e9dd95f 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -1469,6 +1469,8 @@ static void igbvf_reset(struct igbvf_adapter *adapter)
 		memcpy(netdev->perm_addr, adapter->hw.mac.addr,
 		       netdev->addr_len);
 	}
+
+	adapter->last_reset = jiffies;
 }
 
 int igbvf_up(struct igbvf_adapter *adapter)
@@ -1812,11 +1814,15 @@ static bool igbvf_has_link(struct igbvf_adapter *adapter)
 	s32 ret_val = E1000_SUCCESS;
 	bool link_active;
 
+	/* If interface is down, stay link down */
+	if (test_bit(__IGBVF_DOWN, &adapter->state))
+		return false;
+
 	ret_val = hw->mac.ops.check_for_link(hw);
 	link_active = !hw->mac.get_link_status;
 
 	/* if check for link returns error we will need to reset */
-	if (ret_val)
+	if (ret_val && time_after(jiffies, adapter->last_reset + (10 * HZ)))
 		schedule_work(&adapter->reset_task);
 
 	return link_active;

Re: [net-2.6 PATCH 1/2] igb: fix handling of mailbox collisions between PF/VF

[David Miller]

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Fri, 11 Dec 2009 19:40:57 -0800

> From: Alexander Duyck <alexander.h.duyck@intel.com>
> 
> This patch changes the handling of collisions between the use of the PF/VF
> sides of the mailbox.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Applied.

Re: [net-2.6 PATCH 2/2] igbvf: avoid reset storms due to mailbox issues

[David Miller]

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Fri, 11 Dec 2009 19:41:16 -0800

> From: Alexander Duyck <alexander.h.duyck@intel.com>
> 
> This change makes it so that reset/interrupt storms can be avoided when
> there are mailbox issues.  The new behavior is to only allow the device to
> trigger mailbox related resets only once every 10 seconds.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Applied.