Re: [RFC v2 net-next 4/8] net: mscc: ocelot: add gate and police action offload to PSFP

[Vladimir Oltean]

On Wed, Aug 18, 2021 at 02:19:18PM +0800, Xiaoliang Yang wrote:
> @@ -718,6 +734,15 @@ int ocelot_cls_flower_replace(struct ocelot *ocelot, int port,
>  	if (filter->type == OCELOT_VCAP_FILTER_DUMMY)
>  		return ocelot_vcap_dummy_filter_add(ocelot, filter);
>  
> +	if (filter->type == OCELOT_PSFP_FILTER_OFFLOAD) {
> +		kfree(filter);
> +		if (ocelot->ops->psfp_filter_add)
> +			return ocelot->ops->psfp_filter_add(ocelot, f);
> +
> +		NL_SET_ERR_MSG_MOD(extack, "PSFP chain is not supported in HW");
> +		return -EOPNOTSUPP;
> +	}
> +
>  	return ocelot_vcap_filter_add(ocelot, filter, f->common.extack);
>  }

Hmm, I don't really like the idea of allocating an ocelot_vcap_filter
which we don't need for PSFP filters, just to kfree it later.

Is it that much more complicated to not allocate it at all in the first
place, add a bunch of "if" conditions that allocate a VCAP filter only
if we are offloading a VCAP chain?

And that means, don't create ocelot_vcap_filter::type == OCELOT_PSFP_FILTER_OFFLOAD,
because PSFP filters are not VCAP filters.