[dpdk-stable] patch 'net/e1000: fix mailbox interrupt handler' has been queued to LTS release 16.11.5

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to LTS release 16.11.5

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 01/28/18. So please
shout if anyone has objections.

Thanks.

Luca Boccassi

---
>From 91485eca8ac3eea797188c9b85e9e1d89962bfdb Mon Sep 17 00:00:00 2001
From: Qi Zhang <qi.z.zhang at intel.com>
Date: Wed, 27 Dec 2017 15:22:30 -0500
Subject: [PATCH] net/e1000: fix mailbox interrupt handler

[ upstream commit dd18b06a32833543c6951b6206ac39896eaac154 ]

Mailbox interrupt handler only takecare of the PF reset notification,
for other message mbx->ops.read should not be called since it gets
chance to break the foreground VF to PF communication.

Fixes: 316f4f1adc2e ("net/igb: support VF mailbox interrupt for link up/down")

Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
Acked-by: Wei Dai <wei.dai at intel.com>
---
 drivers/net/e1000/igb_ethdev.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index b9b794388..3c85aff3d 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -2757,12 +2757,17 @@ void igbvf_mbx_process(struct rte_eth_dev *dev)
 	struct e1000_mbx_info *mbx = &hw->mbx;
 	u32 in_msg = 0;
 
-	if (mbx->ops.read(hw, &in_msg, 1, 0))
-		return;
+	/* peek the message first */
+	in_msg = E1000_READ_REG(hw, E1000_VMBMEM(0));
 
 	/* PF reset VF event */
-	if (in_msg == E1000_PF_CONTROL_MSG)
-		_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_RESET, NULL);
+	if (in_msg == E1000_PF_CONTROL_MSG) {
+		/* dummy mbx read to ack pf */
+		if (mbx->ops.read(hw, &in_msg, 1, 0))
+			return;
+		_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_RESET,
+					      NULL);
+	}
 }
 
 static int
-- 
2.14.2