netdev - Re: [PATCH nf] netfilter: nf_tables: map basechain priority to hardware priority

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Message-ID: <20190730190804.GQ6204@localhost.localdomain>
Date:   Tue, 30 Jul 2019 16:08:04 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netfilter-devel@...r.kernel.org, wenxu@...oud.cn, jiri@...nulli.us,
        saeedm@...lanox.com, gerlitz.or@...il.com, paulb@...lanox.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH nf] netfilter: nf_tables: map basechain priority to
 hardware priority

On Tue, Jul 30, 2019 at 12:54:17PM +0200, Pablo Neira Ayuso wrote:
> This patch maps basechain netfilter priorities from -8192 to 8191 to
> hardware priority 0xC000 + 1. tcf_auto_prio() uses 0xC000 if the user
> specifies no priority, then it subtract 1 for each new tcf_proto object.
> This patch uses the hardware priority range from 0xC000 to 0xFFFF for
> netfilter.

This makes more sense, thanks Pablo.
Nit below.

> +u16 nft_chain_offload_priority(struct nft_base_chain *basechain)
> +{
> +	u16 prio;
> +
> +	if (basechain->ops.priority < NFT_BASECHAIN_OFFLOAD_PRIO_MIN ||
> +	    basechain->ops.priority > NFT_BASECHAIN_OFFLOAD_PRIO_MAX)
> +		return 0;
> +
> +	/* map netfilter chain priority to hardware priority. */
> +	prio = basechain->ops.priority +
> +		NFT_BASECHAIN_OFFLOAD_PRIO_MAX +
> +			NFT_BASECHAIN_OFFLOAD_HW_PRIO_BASE;

Weird indent here.

> +
> +	return prio;
> +}