netdev - Re: [PATCH v2 net-next 6/6] net: dsa: remove cross-chip support from the MRP notifiers

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Date:   Tue, 22 Jun 2021 09:46:17 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH v2 net-next 6/6] net: dsa: remove cross-chip support from
 the MRP notifiers

The 06/21/2021 19:42, Vladimir Oltean wrote:

Reviewed-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> 
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> With MRP hardware assist being supported only by the ocelot switch
> family, which by design does not support cross-chip bridging, the
> current match functions are at best a guess and have not been confirmed
> in any way to do anything relevant in a multi-switch topology.
> 
> Drop the code and make the notifiers match only on the targeted switch
> port.
> 
> Cc: Horatiu Vultur <horatiu.vultur@...rochip.com>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> v1->v2: remove unused variable "err" in dsa_switch_mrp_add_ring_role()
> 
>  net/dsa/switch.c | 55 ++++++------------------------------------------
>  1 file changed, 7 insertions(+), 48 deletions(-)
> 
> diff --git a/net/dsa/switch.c b/net/dsa/switch.c
> index 75f567390a6b..c1e5afafe633 100644
> --- a/net/dsa/switch.c
> +++ b/net/dsa/switch.c
> @@ -346,36 +346,16 @@ static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
>         return 0;
>  }
> 
> -static bool dsa_switch_mrp_match(struct dsa_switch *ds, int port,
> -                                struct dsa_notifier_mrp_info *info)
> -{
> -       if (ds->index == info->sw_index && port == info->port)
> -               return true;
> -
> -       if (dsa_is_dsa_port(ds, port))
> -               return true;
> -
> -       return false;
> -}
> -
>  static int dsa_switch_mrp_add(struct dsa_switch *ds,
>                               struct dsa_notifier_mrp_info *info)
>  {
> -       int err = 0;
> -       int port;
> -
>         if (!ds->ops->port_mrp_add)
>                 return -EOPNOTSUPP;
> 
> -       for (port = 0; port < ds->num_ports; port++) {
> -               if (dsa_switch_mrp_match(ds, port, info)) {
> -                       err = ds->ops->port_mrp_add(ds, port, info->mrp);
> -                       if (err)
> -                               break;
> -               }
> -       }
> +       if (ds->index == info->sw_index)
> +               return ds->ops->port_mrp_add(ds, info->port, info->mrp);
> 
> -       return err;
> +       return 0;
>  }
> 
>  static int dsa_switch_mrp_del(struct dsa_switch *ds,
> @@ -390,39 +370,18 @@ static int dsa_switch_mrp_del(struct dsa_switch *ds,
>         return 0;
>  }
> 
> -static bool
> -dsa_switch_mrp_ring_role_match(struct dsa_switch *ds, int port,
> -                              struct dsa_notifier_mrp_ring_role_info *info)
> -{
> -       if (ds->index == info->sw_index && port == info->port)
> -               return true;
> -
> -       if (dsa_is_dsa_port(ds, port))
> -               return true;
> -
> -       return false;
> -}
> -
>  static int
>  dsa_switch_mrp_add_ring_role(struct dsa_switch *ds,
>                              struct dsa_notifier_mrp_ring_role_info *info)
>  {
> -       int err = 0;
> -       int port;
> -
>         if (!ds->ops->port_mrp_add)
>                 return -EOPNOTSUPP;
> 
> -       for (port = 0; port < ds->num_ports; port++) {
> -               if (dsa_switch_mrp_ring_role_match(ds, port, info)) {
> -                       err = ds->ops->port_mrp_add_ring_role(ds, port,
> -                                                             info->mrp);
> -                       if (err)
> -                               break;
> -               }
> -       }
> +       if (ds->index == info->sw_index)
> +               return ds->ops->port_mrp_add_ring_role(ds, info->port,
> +                                                      info->mrp);
> 
> -       return err;
> +       return 0;
>  }
> 
>  static int
> --
> 2.25.1
> 

-- 
/Horatiu