[dpdk-dev] [PATCH v2 34/52] net/ice/base: update the vsi handle to remaining VSI

[Wang, Haiyue]

> -----Original Message-----
> From: Yigit, Ferruh <ferruh.yigit at intel.com>
> Sent: Friday, June 12, 2020 02:41
> To: Zhang, Qi Z <qi.z.zhang at intel.com>; Yang, Qiming <qiming.yang at intel.com>
> Cc: Ye, Xiaolong <xiaolong.ye at intel.com>; dev at dpdk.org; Wang, Haiyue <haiyue.wang at intel.com>;
> Stillwell Jr, Paul M <paul.m.stillwell.jr at intel.com>
> Subject: Re: [dpdk-dev] [PATCH v2 34/52] net/ice/base: update the vsi handle to remaining VSI
> 
> On 6/9/2020 12:59 PM, Qi Zhang wrote:
> > Needs to update the VSI handle to the last remaining VSI using the
> > rule for ICE_FWD_TO_VSI. Otherwise it may have error for deleting the
> > rule.
> 
> The reason of the patch is not clear, it looks to "prevent an error for deleting
> the rule", but can you please give more detail?
> Why it cause the error, what rule are we talking about, when this happens, what
> happens if it gives error, why setting to the last remaining VSI helps?
> 

Thing should be simple, it needs to update the VSI handle which is active, the original code
just used the first VSI handle always. If this VSI is removed, and left another latter added
VSI, it should use the latter added VSI handle which means 'the remaining'.

And the 'remaining' is the word in the VSI code context, so use it here to means 'the active'.

> Thanks
> 
> >
> > Signed-off-by: Haiyue Wang <haiyue.wang at intel.com>
> > Signed-off-by: Paul M. Stillwell Jr <paul.m.stillwell.jr at intel.com>
> > Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
> > ---
> >  drivers/net/ice/base/ice_switch.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/net/ice/base/ice_switch.c b/drivers/net/ice/base/ice_switch.c
> > index f379a5f5d..01dcace55 100644
> > --- a/drivers/net/ice/base/ice_switch.c
> > +++ b/drivers/net/ice/base/ice_switch.c
> > @@ -7491,6 +7491,7 @@ ice_adv_rem_update_vsi_list(struct ice_hw *hw, u16 vsi_handle,
> >  			ice_get_hw_vsi_num(hw, rem_vsi_handle);
> >  		fm_list->rule_info.sw_act.fwd_id.hw_vsi_id =
> >  			ice_get_hw_vsi_num(hw, rem_vsi_handle);
> > +		fm_list->rule_info.sw_act.vsi_handle = rem_vsi_handle;
> >
> >  		/* Update the previous switch rule of "MAC forward to VSI" to
> >  		 * "MAC fwd to VSI list"
> >