Re: [PATCH v3] ethdev: add hint when creating async transfer table

[Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>]

On 9/28/22 12:24, Rongwei Liu wrote:
> The transfer domain rule is able to match traffic wire/vf
> origin and it means two directions' underlayer resource.
> 
> In customer deployments, they usually match only one direction
> traffic in single flow table: either from wire or from vf.
> 
> Introduce one new member transfer_mode into rte_flow_template_table_attr
> to indicate the flow table direction property: from wire, from vf
> or bi-direction(default).
> 
> It helps to save underlayer memory also on insertion rate, and this
> new field doesn't expose any matching criteira.
> 
> By default, the transfer domain is to match bi-direction traffic, and
> no behavior changed.
> 
> 1. Match wire origin only
>     flow template_table 0 create group 0 priority 0 transfer wire_orig...
> 2. Match vf origin only
>     flow template_table 0 create group 0 priority 0 transfer vf_orig...

Since wire_orig and vf_orig are just optional hints and not
all PMDs are obliged to handle it, it does not impose any
matching criteria. So, example above are misleading and you
need to add pattern items to highlight that corresponding rules
are really wire_orig or vf_orig.

> 
> Signed-off-by: Rongwei Liu <rongweil@nvidia.com>
> Acked-by: Ori Kam <orika@nvidia.com>

[snip]