Re: Sv: FAILED: patch "[PATCH] net: dsa: microchip: fix bridging with more than two member" failed to apply to 5.16-stable tree

["gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>]

On Sat, Feb 26, 2022 at 01:17:11PM +0000, Svenning Sørensen wrote:
> Commit b3612ccdf284 ("net: dsa: microchip: implement multi-bridge support")
> plugged a packet leak between ports that were members of different bridges.
> Unfortunately, this broke another use case, namely that of more than two
> ports that are members of the same bridge.
> 
> After that commit, when a port is added to a bridge, hardware bridging
> between other member ports of that bridge will be cleared, preventing
> packet exchange between them.
> 
> Fix by ensuring that the Port VLAN Membership bitmap includes any existing
> ports in the bridge, not just the port being added.
> 
> Upstream commit 3d00827a90db6f79abc7cdc553887f89a2e0a184, backported to 5.16.
> 
> Fixes: b3612ccdf284 ("net: dsa: microchip: implement multi-bridge support")
> Signed-off-by: Svenning Sørensen <sss@secomea.com>
> Tested-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> ---
>  drivers/net/dsa/microchip/ksz_common.c | 26 +++++++++++++++++++++++---
>  1 file changed, 23 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> index 8a04302018dc..7ab9ab58de65 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -26,7 +26,7 @@ void ksz_update_port_member(struct ksz_device *dev, int port)
>         struct dsa_switch *ds = dev->ds;
>         u8 port_member = 0, cpu_port;
>         const struct dsa_port *dp;
> -       int i;
> +       int i, j;
> 
>         if (!dsa_is_user_port(ds, port))
>                 return;
> @@ -45,13 +45,33 @@ void ksz_update_port_member(struct ksz_device *dev, int port)
>                         continue;
>                 if (!dp->bridge_dev || dp->bridge_dev != other_dp->bridge_dev)
>                         continue;
> +               if (other_p->stp_state != BR_STATE_FORWARDING)
> +                       continue;
> 
> -               if (other_p->stp_state == BR_STATE_FORWARDING &&
> -                   p->stp_state == BR_STATE_FORWARDING) {
> +               if (p->stp_state == BR_STATE_FORWARDING) {
>                         val |= BIT(port);
>                         port_member |= BIT(i);
>                 }
> 
> +               /* Retain port [i]'s relationship to other ports than [port] */
> +               for (j = 0; j < ds->num_ports; j++) {
> +                       const struct dsa_port *third_dp;
> +                       struct ksz_port *third_p;
> +
> +                       if (j == i)
> +                               continue;
> +                       if (j == port)
> +                               continue;
> +                       if (!dsa_is_user_port(ds, j))
> +                               continue;
> +                       third_p = &dev->ports[j];
> +                       if (third_p->stp_state != BR_STATE_FORWARDING)
> +                               continue;
> +                       third_dp = dsa_to_port(ds, j);
> +                       if (third_dp->bridge_dev == dp->bridge_dev)
> +                               val |= BIT(j);
> +               }
> +
>                 dev->dev_ops->cfg_port_member(dev, i, val | cpu_port);
>         }
> 
> --
> 2.20.1
> 

Patch is whitespace corrupted (tabs -> spaces) and can not be applied at
all :(

Please fix up and resend.

thanks,

greg k-h