From fef45f4ce221fc110f70716a00f40be697c5b254 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Fri, 11 Dec 2009 22:57:34 -0800 Subject: [PATCH] igb: fix handling of mailbox collisions between PF/VF This patch changes the handling of collisions between the use of the PF/VF sides of the mailbox. Signed-off-by: Alexander Duyck Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/igb/igb_main.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index 16349ba6873..78963a0e128 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); }