net/ixgbe: fix VFIO interrupt mapping in VF

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")
Cc: stable@dpdk.org
Signed-off-by: Wei Dai <wei.dai@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Tested-by: Jianwei Ma <jianwei.ma@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index cfe1c11..a0588ab 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -5048,6 +5048,15 @@ 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 */