[dpdk-stable] patch 'net/ixgbe: fix VFIO interrupt mapping in VF' has been queued to LTS release 16.11.4

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to LTS release 16.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/01/17. So please
shout if anyone has objections.

Thanks.

Kind regards,
Luca Boccassi

---
>From 50f47bf258bf043b917ac1e8cead95fdcc217b43 Mon Sep 17 00:00:00 2001
From: Wei Dai <wei.dai at intel.com>
Date: Thu, 28 Sep 2017 10:28:33 +0800
Subject: [PATCH] net/ixgbe: fix VFIO interrupt mapping in VF

[ upstream commit 06938770186afcfd05a4d6d3addee12645c9c558 ]

When a VF port is bound to VFIO-PIC, only miscellaneous interrupt
is mapped to VFIO vector 0 in eth_ixgbevf_dev_init( ).
In ixgbevf_dev_start(), if previous VFIO interrupt mapping set in
eth_ixgbevf_dev_init( ) is not cleard, it will fail when calling
rte_intr_enable( ) tries to map Rx queue interrupt to other VFIO
vectors. This patch clears the VFIO interrupt mappings before
setting both miscellaneous and Rx queue interrupt mappings again
to avoid failure.

Fixes: 77234603fba0 ("net/ixgbe: support VF mailbox interrupt for link up/down")

Signed-off-by: Wei Dai <wei.dai at intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
Tested-by: Jianwei Ma <jianwei.ma at intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 3b51bcc3d..d471488cb 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -4250,6 +4250,15 @@ ixgbevf_dev_start(struct rte_eth_dev *dev)
 	}
 	ixgbevf_configure_msix(dev);
 
+	/* When a VF port is bound to VFIO-PCI, only miscellaneous interrupt
+	 * is mapped to VFIO vector 0 in eth_ixgbevf_dev_init( ).
+	 * If previous VFIO interrupt mapping setting in eth_ixgbevf_dev_init( )
+	 * is not cleared, it will fail when following rte_intr_enable( ) tries
+	 * to map Rx queue interrupt to other VFIO vectors.
+	 * So clear uio/vfio intr/evevnfd first to avoid failure.
+	 */
+	rte_intr_disable(intr_handle);
+
 	rte_intr_enable(intr_handle);
 
 	/* Re-enable interrupt for VF */
-- 
2.11.0