target/linux/generic/backport-6.1/780-v6.6-02-net-dsa-qca8k-limit-user-ports-access-to-the-first-C.patch

   1 From 18e8feae4a807994e4906d659116d249bfecd4c5 Mon Sep 17 00:00:00 2001
   2 From: Christian Marangi <ansuelsmth@gmail.com>
   3 Date: Sun, 30 Jul 2023 09:41:11 +0200
   4 Subject: [PATCH 2/4] net: dsa: qca8k: limit user ports access to the first CPU
   5  port on setup
   6
   7 In preparation for multi-CPU support, set CPU port LOOKUP MEMBER outside
   8 the port loop and setup the LOOKUP MEMBER mask for user ports only to
   9 the first CPU port.
  10
  11 This is to handle flooding condition where every CPU port is set as
  12 target and prevent packet duplication for unknown frames from user ports.
  13
  14 Secondary CPU port LOOKUP MEMBER mask will be setup later when
  15 port_change_master will be implemented.
  16
  17 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  18 Reviewed-by: Simon Horman <simon.horman@corigine.com>
  19 Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
  20 Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
  21 Link: https://lore.kernel.org/r/20230730074113.21889-3-ansuelsmth@gmail.com
  22 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
  23 ---
  24  drivers/net/dsa/qca/qca8k-8xxx.c | 14 ++++++--------
  25  1 file changed, 6 insertions(+), 8 deletions(-)
  26
  27 --- a/drivers/net/dsa/qca/qca8k-8xxx.c
  28 +++ b/drivers/net/dsa/qca/qca8k-8xxx.c
  29 @@ -1874,18 +1874,16 @@ qca8k_setup(struct dsa_switch *ds)
  30         if (ret)
  31                 return ret;
  32
  33 +       /* CPU port gets connected to all user ports of the switch */
  34 +       ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(cpu_port),
  35 +                       QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
  36 +       if (ret)
  37 +               return ret;
  38 +
  39         /* Setup connection between CPU port & user ports
  40          * Configure specific switch configuration for ports
  41          */
  42         for (i = 0; i < QCA8K_NUM_PORTS; i++) {
  43 -               /* CPU port gets connected to all user ports of the switch */
  44 -               if (dsa_is_cpu_port(ds, i)) {
  45 -                       ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
  46 -                                       QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
  47 -                       if (ret)
  48 -                               return ret;
  49 -               }
  50 -
  51                 /* Individual user ports get connected to CPU port only */
  52                 if (dsa_is_user_port(ds, i)) {
  53                         ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),