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

[Dai, Wei]

Hi, Jingjing
Thanks for your feedback.

> > 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?
Yes, it is my typo error, it 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 at dpdk.org
> >
> > Signed-off-by: Wei Dai <wei.dai at 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.

Yes, I have followed your suggestion and tested it with my following code change.
it works well.
The function rte_intr_disable( ) can be moved into i40evf_dev_start( ) and only
be called it if rx queue interrupt is enabled.
Meanwhile, the calling of rte_intr_enable( ) in i40evf_dev_interrupt_handle( )
and i40evf_dev_rx_queue_intr_enable( ) can also be removed.


> >  }
> >
> >  static int
> > --
> > 2.7.5