linux-kernel - Re: [PATCH] DSA support for Micrel KSZ8895

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Message-ID: <20170828064020.GA7721@amd>
Date:   Mon, 28 Aug 2017 08:40:20 +0200
From:   Pavel Machek <pavel@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Woojung.Huh@...rochip.com, nathan.leigh.conrad@...il.com,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tristram.Ha@...rel.com
Subject: Re: [PATCH] DSA support for Micrel KSZ8895

Hi!

> > No, tag_ksz part probably is not acceptable. Do you see solution
> > better than just copying it into tag_ksz1 file?
> 
> How about something like this, which needs further work to actually
> compile, but should give you the idea.

If that's acceptable, yes, I can do something similar. I don't think
CONFIG_NET_DSA_TAG_KSZ_8K / CONFIG_NET_DSA_TAG_KSZ_9K is suitable
naming (these will probably differ according to number of ports), what
about keeping CONFIG_NET_DSA_TAG_KSZ and adding
CONFIG_NET_DSA_TAG_KSZ_1B (for one byte)?

Thanks,
								Pavel

> 	 Andrew
> 
> index 99e38af85fc5..843e77b7c270 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -49,8 +49,11 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
>  #ifdef CONFIG_NET_DSA_TAG_EDSA
>         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
>  #endif
> -#ifdef CONFIG_NET_DSA_TAG_KSZ
> -       [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
> +#ifdef CONFIG_NET_DSA_TAG_KSZ_8K
> +       [DSA_TAG_PROTO_KSZ8K] = &ksz8k_netdev_ops,
> +#endif
> +#ifdef CONFIG_NET_DSA_TAG_KSZ_9K
> +       [DSA_TAG_PROTO_KSZ9K] = &ksz9k_netdev_ops,
>  #endif
>  #ifdef CONFIG_NET_DSA_TAG_LAN9303
>         [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
> diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
> index de66ca8e6201..398b833889f1 100644
> --- a/net/dsa/tag_ksz.c
> +++ b/net/dsa/tag_ksz.c
> @@ -35,6 +35,9 @@
>  static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
>  {
>         struct dsa_slave_priv *p = netdev_priv(dev);
> +       struct dsa_port *dp = p->dp;
> +       struct dsa_switch *ds = dp->ds;
> +       struct dsa_switch_tree *dst = ds->dst;
>         struct sk_buff *nskb;
>         int padlen;
>         u8 *tag;
> @@ -69,8 +72,14 @@ static struct sk_buff *ksz_xmit(struct sk_buff *skb, struct net_device *dev)
>         }
>  
>         tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN);
> -       tag[0] = 0;
> -       tag[1] = 1 << p->dp->index; /* destination port */
> +       if (dst->tag_ops == ksz8k_netdev_ops) {
> +               tag[0] = 1 << p->dp->index; /* destination port */0;
> +               tag[1] = 0;
> +       }
> +
> +       if (dst->tag_ops == ksz9k_netdev_ops) {
> +               tag[0] = 0;
> +               tag[1] = 1 << p->dp->index; /* destination port */
>  
>         return nskb;
>  }
> @@ -98,7 +107,12 @@ static struct sk_buff *ksz_rcv(struct sk_buff *skb, struct net_device *dev,
>         return skb;
>  }
>  
> -const struct dsa_device_ops ksz_netdev_ops = {
> +const struct dsa_device_ops ksz8k_netdev_ops = {
> +       .xmit   = ksz_xmit,
> +       .rcv    = ksz_rcv,
> +};
> +
> +const struct dsa_device_ops ksz9k_netdev_ops = {
>         .xmit   = ksz_xmit,
>         .rcv    = ksz_rcv,
>  };

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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