linux-kernel - Re: [PATCH net-next v2 2/2] net: mscc: ocelot: Hardware ofload for tc flower filter

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Date:   Wed, 29 May 2019 15:18:44 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "Paul Burton" <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        <linux-mips@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/2] net: mscc: ocelot: Hardware ofload for
 tc flower filter

On Wed, 29 May 2019 12:26:20 +0200, Horatiu Vultur wrote:
> +static int ocelot_flower_replace(struct tc_cls_flower_offload *f,
> +				 struct ocelot_port_block *port_block)
> +{
> +	struct ocelot_ace_rule *rule;
> +	int ret;
> +
> +	if (port_block->port->tc.block_shared)
> +		return -EOPNOTSUPP;

FWIW since you only support TRAP and DROP actions here (AFAICT) you
should actually be okay with shared blocks.  The problems with shared
blocks start when the action is stateful (like act_police), because we
can't share that state between devices.  But for most actions which just
maintain statistics, it's fine to allow shared blocks.  HTH