netdev - Re: [net-next PATCH v2 5/6] i40e: Add TX and RX support in switchdev mode.

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Date:   Sat, 7 Jan 2017 09:27:47 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kubakici@...pl>
Cc:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        alexander.h.duyck@...el.com, john.r.fastabend@...el.com,
        anjali.singhai@...el.com, jakub.kicinski@...ronome.com,
        davem@...emloft.net, intel-wired-lan@...ts.osuosl.org,
        netdev@...r.kernel.org
Subject: Re: [net-next PATCH v2 5/6] i40e: Add TX and RX support in switchdev
 mode.

Fri, Jan 06, 2017 at 08:08:58PM CET, kubakici@...pl wrote:
>On Fri, 6 Jan 2017 18:30:35 +0100, Jiri Pirko wrote:
>> >> > +	skb_dst_drop(skb);
>> >> > +	dst_hold(&priv->vfpr_dst->dst);
>> >> > +	skb_dst_set(skb, &priv->vfpr_dst->dst);
>> >> > +	skb->dev = vsi->netdev;  
>> >> This dst dance seems a bit odd to me. Why don't you just call
>> >> i40e_xmit_frame_ring with an extra arg holding the needed metadata?  
>> >
>> >We don't have TX/RX queues associated with VFPR netdevs, so we need to set
>> >the dev to PF netdev and requeue the skb.  
>> 
>> Still, you eventually call a function within same .c file. Using dst
>> does not look right to me.
>
>Do you mean you don't like reusing the dst_metadata to store the
>representative id?  The missing patch provided the reasoning behind
>this design [1].  It's mostly about being able to comfortably use the
>queuing infrastructure.  Trying to push data from multiple netdevs into
>single ring at driver layer is even less pretty.
>
>[1] http://patchwork.ozlabs.org/patch/710563/

Okay, makes sense. Thanks.