net/dsa/port.c

   1 /*
   2  * Handling of a single switch port
   3  *
   4  * Copyright (c) 2017 Savoir-faire Linux Inc.
   5  *      Vivien Didelot <vivien.didelot@savoirfairelinux.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/if_bridge.h>
  14 #include <linux/notifier.h>
  15
  16 #include "dsa_priv.h"
  17
  18 static int dsa_port_notify(struct dsa_port *dp, unsigned long e, void *v)
  19 {
  20         struct raw_notifier_head *nh = &dp->ds->dst->nh;
  21         int err;
  22
  23         err = raw_notifier_call_chain(nh, e, v);
  24
  25         return notifier_to_errno(err);
  26 }
  27
  28 int dsa_port_set_state(struct dsa_port *dp, u8 state,
  29                        struct switchdev_trans *trans)
  30 {
  31         struct dsa_switch *ds = dp->ds;
  32         int port = dp->index;
  33
  34         if (switchdev_trans_ph_prepare(trans))
  35                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
  36
  37         if (ds->ops->port_stp_state_set)
  38                 ds->ops->port_stp_state_set(ds, port, state);
  39
  40         if (ds->ops->port_fast_age) {
  41                 /* Fast age FDB entries or flush appropriate forwarding database
  42                  * for the given port, if we are moving it from Learning or
  43                  * Forwarding state, to Disabled or Blocking or Listening state.
  44                  */
  45
  46                 if ((dp->stp_state == BR_STATE_LEARNING ||
  47                      dp->stp_state == BR_STATE_FORWARDING) &&
  48                     (state == BR_STATE_DISABLED ||
  49                      state == BR_STATE_BLOCKING ||
  50                      state == BR_STATE_LISTENING))
  51                         ds->ops->port_fast_age(ds, port);
  52         }
  53
  54         dp->stp_state = state;
  55
  56         return 0;
  57 }
  58
  59 void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
  60 {
  61         int err;
  62
  63         err = dsa_port_set_state(dp, state, NULL);
  64         if (err)
  65                 pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
  66 }
  67
  68 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
  69 {
  70         struct dsa_notifier_bridge_info info = {
  71                 .sw_index = dp->ds->index,
  72                 .port = dp->index,
  73                 .br = br,
  74         };
  75         int err;
  76
  77         /* Here the port is already bridged. Reflect the current configuration
  78          * so that drivers can program their chips accordingly.
  79          */
  80         dp->bridge_dev = br;
  81
  82         err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
  83
  84         /* The bridging is rolled back on error */
  85         if (err)
  86                 dp->bridge_dev = NULL;
  87
  88         return err;
  89 }
  90
  91 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
  92 {
  93         struct dsa_notifier_bridge_info info = {
  94                 .sw_index = dp->ds->index,
  95                 .port = dp->index,
  96                 .br = br,
  97         };
  98         int err;
  99
 100         /* Here the port is already unbridged. Reflect the current configuration
 101          * so that drivers can program their chips accordingly.
 102          */
 103         dp->bridge_dev = NULL;
 104
 105         err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 106         if (err)
 107                 pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
 108
 109         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
 110          * so allow it to be in BR_STATE_FORWARDING to be kept functional
 111          */
 112         dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 113 }
 114
 115 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
 116                             struct switchdev_trans *trans)
 117 {
 118         struct dsa_switch *ds = dp->ds;
 119
 120         /* bridge skips -EOPNOTSUPP, so skip the prepare phase */
 121         if (switchdev_trans_ph_prepare(trans))
 122                 return 0;
 123
 124         if (ds->ops->port_vlan_filtering)
 125                 return ds->ops->port_vlan_filtering(ds, dp->index,
 126                                                     vlan_filtering);
 127
 128         return 0;
 129 }
 130
 131 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
 132                          struct switchdev_trans *trans)
 133 {
 134         unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
 135         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 136         struct dsa_notifier_ageing_time_info info = {
 137                 .ageing_time = ageing_time,
 138                 .trans = trans,
 139         };
 140
 141         if (switchdev_trans_ph_prepare(trans))
 142                 return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 143
 144         dp->ageing_time = ageing_time;
 145
 146         return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 147 }
 148
 149 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 150                      u16 vid)
 151 {
 152         struct dsa_notifier_fdb_info info = {
 153                 .sw_index = dp->ds->index,
 154                 .port = dp->index,
 155                 .addr = addr,
 156                 .vid = vid,
 157         };
 158
 159         return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
 160 }
 161
 162 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 163                      u16 vid)
 164 {
 165         struct dsa_notifier_fdb_info info = {
 166                 .sw_index = dp->ds->index,
 167                 .port = dp->index,
 168                 .addr = addr,
 169                 .vid = vid,
 170
 171         };
 172
 173         return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
 174 }
 175
 176 int dsa_port_mdb_add(struct dsa_port *dp,
 177                      const struct switchdev_obj_port_mdb *mdb,
 178                      struct switchdev_trans *trans)
 179 {
 180         struct dsa_notifier_mdb_info info = {
 181                 .sw_index = dp->ds->index,
 182                 .port = dp->index,
 183                 .trans = trans,
 184                 .mdb = mdb,
 185         };
 186
 187         return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
 188 }
 189
 190 int dsa_port_mdb_del(struct dsa_port *dp,
 191                      const struct switchdev_obj_port_mdb *mdb)
 192 {
 193         struct dsa_notifier_mdb_info info = {
 194                 .sw_index = dp->ds->index,
 195                 .port = dp->index,
 196                 .mdb = mdb,
 197         };
 198
 199         return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
 200 }
 201
 202 int dsa_port_vlan_add(struct dsa_port *dp,
 203                       const struct switchdev_obj_port_vlan *vlan,
 204                       struct switchdev_trans *trans)
 205 {
 206         struct dsa_notifier_vlan_info info = {
 207                 .sw_index = dp->ds->index,
 208                 .port = dp->index,
 209                 .trans = trans,
 210                 .vlan = vlan,
 211         };
 212
 213         return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
 214 }
 215
 216 int dsa_port_vlan_del(struct dsa_port *dp,
 217                       const struct switchdev_obj_port_vlan *vlan)
 218 {
 219         struct dsa_notifier_vlan_info info = {
 220                 .sw_index = dp->ds->index,
 221                 .port = dp->index,
 222                 .vlan = vlan,
 223         };
 224
 225         return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
 226 }