[dpdk-dev,v3,1/2] net/i40e: fix VFIO interrupt mapping in VF

Message ID 1509698850-13301-2-git-send-email-wei.dai@intel.com
State Accepted, archived
Delegated to: Ferruh Yigit
Headers show

Checks

Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Wei Dai Nov. 3, 2017, 8:47 a.m.
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")
Cc: stable@dpdk.org

Signed-off-by: Wei Dai <wei.dai@intel.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Comments

Wu, Jingjing Nov. 3, 2017, 10:36 a.m. | #1
> -----Original Message-----
> From: Dai, Wei
> Sent: Friday, November 3, 2017 4:47 PM
> To: Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> Cc: dev@dpdk.org; Dai, Wei <wei.dai@intel.com>; stable@dpdk.org
> Subject: [PATCH v3 1/2] net/i40e: 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 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")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Wei Dai <wei.dai@intel.com>

Acked-by: Jingjing Wu <jingjing.wu@intel.com>

Patch

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 3b76c9e..f2af022 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1433,7 +1433,6 @@  i40evf_dev_interrupt_handler(void *param)
 
 done:
 	i40evf_enable_irq0(hw);
-	rte_intr_enable(dev->intr_handle);
 }
 
 static int
@@ -2041,7 +2040,20 @@  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: