netdev - Re: [PATCH RFC net-next 03/19] net: dsa: tag_ar9331: add .flow

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Date:   Mon, 30 Dec 2019 10:22:36 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Alexander Lobakin <alobakin@...nk.ru>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Edward Cree <ecree@...arflare.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Taehee Yoo <ap420073@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Song Liu <songliubraving@...com>,
        Matteo Croce <mcroce@...hat.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Paul Blakey <paulb@...lanox.com>,
        Yoshiki Komachi <komachi.yoshiki@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC net-next 03/19] net: dsa: tag_ar9331: add
 .flow_dissect() callback

On 12/30/19 6:30 AM, Alexander Lobakin wrote:
> ...to make RPS work correctly if user would like to configure it.
> Misc: fix identation of ar9331_netdev_ops structure.
> 
> Signed-off-by: Alexander Lobakin <alobakin@...nk.ru>
> ---
>  net/dsa/tag_ar9331.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/net/dsa/tag_ar9331.c b/net/dsa/tag_ar9331.c
> index 466ffa92a474..399ca21ec03b 100644
> --- a/net/dsa/tag_ar9331.c
> +++ b/net/dsa/tag_ar9331.c
> @@ -83,12 +83,20 @@ static struct sk_buff *ar9331_tag_rcv(struct sk_buff *skb,
>  	return skb;
>  }
>  
> +static void ar9331_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
> +				    int *offset)
> +{
> +	*offset = AR9331_HDR_LEN;
> +	*proto = *(__be16 *)skb->data;

If we provided an offset from the beginning of the frame, then there is
no need to call .flow_dissect() at all and we can just return the
dsa_device_ops::overhead and offset_start (whatever is the name we pick)
and avoid a function call.

> +}
> +
>  static const struct dsa_device_ops ar9331_netdev_ops = {
> -	.name	= "ar9331",
> -	.proto	= DSA_TAG_PROTO_AR9331,
> -	.xmit	= ar9331_tag_xmit,
> -	.rcv	= ar9331_tag_rcv,
> -	.overhead = AR9331_HDR_LEN,
> +	.name		= "ar9331",
> +	.proto		= DSA_TAG_PROTO_AR9331,
> +	.xmit		= ar9331_tag_xmit,
> +	.rcv		= ar9331_tag_rcv,
> +	.flow_dissect	= ar9331_tag_flow_dissect,
> +	.overhead	= AR9331_HDR_LEN,
>  };
>  
>  MODULE_LICENSE("GPL v2");
> 


-- 
Florian