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

["Wu, Jingjing" <jingjing.wu@intel.com>]

> -----Original Message-----
> From: Dai, Wei
> Sent: Thursday, November 2, 2017 9:11 PM
> To: Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>;
> Liang, Cunming <cunming.liang@intel.com>
> Cc: dev@dpdk.org; Dai, Wei <wei.dai@intel.com>; stable@dpdk.org
> Subject: [PATCH 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 ixgbevf_dev_interrupt_handler( ), if previous VFIO interrupt mapping set in

Ixgbevf? Should be i40evf?

> i40evf_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: 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 | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev_vf.c
> b/drivers/net/i40e/i40e_ethdev_vf.c
> index 3b76c9e..567b7d0 100644
> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> @@ -1432,8 +1432,9 @@ i40evf_dev_interrupt_handler(void *param)
>  				   " do nothing");
> 
>  done:
> -	i40evf_enable_irq0(hw);
> +	rte_intr_disable(dev->intr_handle);
>  	rte_intr_enable(dev->intr_handle);
> +	i40evf_enable_irq0(hw);

If that reason, you can move the rte_intr_disable to dev_start when deal with the rxq setting in intr_conf.
>  }
> 
>  static int
> --
> 2.7.5