[dpdk-stable] patch 'net/i40e: 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 11/12/17. So please
shout if anyone has objections.

Thanks.

Kind regards,
Luca Boccassi

---
>From 4eeaed0686eefed1500f0dfb2be54c3d1d77c149 Mon Sep 17 00:00:00 2001
From: Wei Dai <wei.dai at intel.com>
Date: Fri, 3 Nov 2017 16:47:29 +0800
Subject: [PATCH] net/i40e: fix VFIO interrupt mapping in VF

[ upstream commit 66b8304f9d5f8be5dccd169a7ced4fb6c058b488 ]

When a VF port is bound to VFIO-PIC, only miscellaneous interrupt
is mapped to VFIO vector 0 in i40evf_dev_init( ).
In i40evf_dev_interrupt_handle( ) and i40evf_dev_rx_queue_intr_enable( ),
if previous VFIO interrupt mapping set in i40evf_dev_init( ) is not
cleared, it will fail when PMD tries to map Rx queue interrupt to other
VFIO vectors by calling rte_intr_enable( ).

This patch clears the VFIO interrupt mappings before setting both
miscellaneous and Rx queue interrupt mappings again to avoid failure.
And remove the calling of rte_intr_enable( ) in
i40evf_dev_interrupt_handler( ) as there is no need to map VFIO interrupt
in this function repeatedly.

Fixes: 4b90a3ff26c5 ("i40evf: support Rx interrupt")

Signed-off-by: Wei Dai <wei.dai at intel.com>
Tested-by: Lei Yao <lei.a.yao at intel.com>
Acked-by: Jingjing Wu <jingjing.wu at intel.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index d47265f70..424942a33 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1504,7 +1504,6 @@ i40evf_dev_interrupt_handler(__rte_unused struct rte_intr_handle *handle,
 
 done:
 	i40evf_enable_irq0(hw);
-	rte_intr_enable(&dev->pci_dev->intr_handle);
 }
 
 static int
@@ -2155,7 +2154,20 @@ i40evf_dev_start(struct rte_eth_dev *dev)
 		goto err_mac;
 	}
 
+	/* When a VF port is bound to VFIO-PCI, only miscellaneous interrupt
+	 * is mapped to VFIO vector 0 in i40evf_dev_init( ).
+	 * If previous VFIO interrupt mapping set in i40evf_dev_init( ) is
+	 * not cleared, it will fail when rte_intr_enable( ) tries to map Rx
+	 * queue interrupt to other VFIO vectors.
+	 * So clear uio/vfio intr/evevnfd first to avoid failure.
+	 */
+	if (dev->data->dev_conf.intr_conf.rxq != 0) {
+		rte_intr_disable(intr_handle);
+		rte_intr_enable(intr_handle);
+	}
+
 	i40evf_enable_queues_intr(dev);
+
 	return 0;
 
 err_mac:
-- 
2.11.0