target/linux/generic/backport-5.15/705-01-v5.17-net-dsa-mt7530-iterate-using-dsa_switch_for_each_use.patch

   1 From 505560028b6deb9b4385cf6100f05ca6f4aacaf8 Mon Sep 17 00:00:00 2001
   2 From: Vladimir Oltean <vladimir.oltean@nxp.com>
   3 Date: Mon, 6 Dec 2021 18:57:49 +0200
   4 Subject: [PATCH 01/13] net: dsa: mt7530: iterate using
   5  dsa_switch_for_each_user_port in bridging ops
   6
   7 Avoid repeated calls to dsa_to_port() (some hidden behind dsa_is_user_port
   8 and some in plain sight) by keeping two struct dsa_port references: one
   9 to the port passed as argument, and another to the other ports of the
  10 switch that we're iterating over.
  11
  12 dsa_to_port(ds, i) gets replaced by other_dp, i gets replaced by
  13 other_port which is derived from other_dp->index, dsa_is_user_port is
  14 handled by the DSA iterator.
  15
  16 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
  17 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  18 ---
  19  drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++++++-----------------
  20  1 file changed, 30 insertions(+), 22 deletions(-)
  21
  22 --- a/drivers/net/dsa/mt7530.c
  23 +++ b/drivers/net/dsa/mt7530.c
  24 @@ -1198,27 +1198,31 @@ static int
  25  mt7530_port_bridge_join(struct dsa_switch *ds, int port,
  26                         struct net_device *bridge)
  27  {
  28 -       struct mt7530_priv *priv = ds->priv;
  29 +       struct dsa_port *dp = dsa_to_port(ds, port), *other_dp;
  30         u32 port_bitmap = BIT(MT7530_CPU_PORT);
  31 -       int i;
  32 +       struct mt7530_priv *priv = ds->priv;
  33
  34         mutex_lock(&priv->reg_mutex);
  35
  36 -       for (i = 0; i < MT7530_NUM_PORTS; i++) {
  37 +       dsa_switch_for_each_user_port(other_dp, ds) {
  38 +               int other_port = other_dp->index;
  39 +
  40 +               if (dp == other_dp)
  41 +                       continue;
  42 +
  43                 /* Add this port to the port matrix of the other ports in the
  44                  * same bridge. If the port is disabled, port matrix is kept
  45                  * and not being setup until the port becomes enabled.
  46                  */
  47 -               if (dsa_is_user_port(ds, i) && i != port) {
  48 -                       if (dsa_to_port(ds, i)->bridge_dev != bridge)
  49 -                               continue;
  50 -                       if (priv->ports[i].enable)
  51 -                               mt7530_set(priv, MT7530_PCR_P(i),
  52 -                                          PCR_MATRIX(BIT(port)));
  53 -                       priv->ports[i].pm |= PCR_MATRIX(BIT(port));
  54 +               if (other_dp->bridge_dev != bridge)
  55 +                       continue;
  56
  57 -                       port_bitmap |= BIT(i);
  58 -               }
  59 +               if (priv->ports[other_port].enable)
  60 +                       mt7530_set(priv, MT7530_PCR_P(other_port),
  61 +                                  PCR_MATRIX(BIT(port)));
  62 +               priv->ports[other_port].pm |= PCR_MATRIX(BIT(port));
  63 +
  64 +               port_bitmap |= BIT(other_port);
  65         }
  66
  67         /* Add the all other ports to this port matrix. */
  68 @@ -1323,24 +1327,28 @@ static void
  69  mt7530_port_bridge_leave(struct dsa_switch *ds, int port,
  70                          struct net_device *bridge)
  71  {
  72 +       struct dsa_port *dp = dsa_to_port(ds, port), *other_dp;
  73         struct mt7530_priv *priv = ds->priv;
  74 -       int i;
  75
  76         mutex_lock(&priv->reg_mutex);
  77
  78 -       for (i = 0; i < MT7530_NUM_PORTS; i++) {
  79 +       dsa_switch_for_each_user_port(other_dp, ds) {
  80 +               int other_port = other_dp->index;
  81 +
  82 +               if (dp == other_dp)
  83 +                       continue;
  84 +
  85                 /* Remove this port from the port matrix of the other ports
  86                  * in the same bridge. If the port is disabled, port matrix
  87                  * is kept and not being setup until the port becomes enabled.
  88                  */
  89 -               if (dsa_is_user_port(ds, i) && i != port) {
  90 -                       if (dsa_to_port(ds, i)->bridge_dev != bridge)
  91 -                               continue;
  92 -                       if (priv->ports[i].enable)
  93 -                               mt7530_clear(priv, MT7530_PCR_P(i),
  94 -                                            PCR_MATRIX(BIT(port)));
  95 -                       priv->ports[i].pm &= ~PCR_MATRIX(BIT(port));
  96 -               }
  97 +               if (other_dp->bridge_dev != bridge)
  98 +                       continue;
  99 +
 100 +               if (priv->ports[other_port].enable)
 101 +                       mt7530_clear(priv, MT7530_PCR_P(other_port),
 102 +                                    PCR_MATRIX(BIT(port)));
 103 +               priv->ports[other_port].pm &= ~PCR_MATRIX(BIT(port));
 104         }
 105
 106         /* Set the cpu port to be the only one in the port matrix of