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 static unsigned int dsa_fastest_ageing_time(struct dsa_switch *ds,
 132                                             unsigned int ageing_time)
 133 {
 134         int i;
 135
 136         for (i = 0; i < ds->num_ports; ++i) {
 137                 struct dsa_port *dp = &ds->ports[i];
 138
 139                 if (dp->ageing_time && dp->ageing_time < ageing_time)
 140                         ageing_time = dp->ageing_time;
 141         }
 142
 143         return ageing_time;
 144 }
 145
 146 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
 147                          struct switchdev_trans *trans)
 148 {
 149         unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
 150         unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
 151         struct dsa_switch *ds = dp->ds;
 152
 153         if (switchdev_trans_ph_prepare(trans)) {
 154                 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
 155                         return -ERANGE;
 156                 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
 157                         return -ERANGE;
 158                 return 0;
 159         }
 160
 161         /* Keep the fastest ageing time in case of multiple bridges */
 162         dp->ageing_time = ageing_time;
 163         ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
 164
 165         if (ds->ops->set_ageing_time)
 166                 return ds->ops->set_ageing_time(ds, ageing_time);
 167
 168         return 0;
 169 }
 170
 171 int dsa_port_fdb_add(struct dsa_port *dp,
 172                      const struct switchdev_obj_port_fdb *fdb,
 173                      struct switchdev_trans *trans)
 174 {
 175         struct dsa_switch *ds = dp->ds;
 176
 177         if (switchdev_trans_ph_prepare(trans)) {
 178                 if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
 179                         return -EOPNOTSUPP;
 180
 181                 return ds->ops->port_fdb_prepare(ds, dp->index, fdb, trans);
 182         }
 183
 184         ds->ops->port_fdb_add(ds, dp->index, fdb, trans);
 185
 186         return 0;
 187 }
 188
 189 int dsa_port_fdb_del(struct dsa_port *dp,
 190                      const struct switchdev_obj_port_fdb *fdb)
 191 {
 192         struct dsa_switch *ds = dp->ds;
 193
 194         if (ds->ops->port_fdb_del)
 195                 return -EOPNOTSUPP;
 196
 197         return ds->ops->port_fdb_del(ds, dp->index, fdb);
 198 }
 199
 200 int dsa_port_fdb_dump(struct dsa_port *dp, struct switchdev_obj_port_fdb *fdb,
 201                       switchdev_obj_dump_cb_t *cb)
 202 {
 203         struct dsa_switch *ds = dp->ds;
 204
 205         if (ds->ops->port_fdb_dump)
 206                 return ds->ops->port_fdb_dump(ds, dp->index, fdb, cb);
 207
 208         return -EOPNOTSUPP;
 209 }
 210
 211 int dsa_port_mdb_add(struct dsa_port *dp,
 212                      const struct switchdev_obj_port_mdb *mdb,
 213                      struct switchdev_trans *trans)
 214 {
 215         struct dsa_switch *ds = dp->ds;
 216
 217         if (switchdev_trans_ph_prepare(trans)) {
 218                 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 219                         return -EOPNOTSUPP;
 220
 221                 return ds->ops->port_mdb_prepare(ds, dp->index, mdb, trans);
 222         }
 223
 224         ds->ops->port_mdb_add(ds, dp->index, mdb, trans);
 225
 226         return 0;
 227 }
 228
 229 int dsa_port_mdb_del(struct dsa_port *dp,
 230                      const struct switchdev_obj_port_mdb *mdb)
 231 {
 232         struct dsa_switch *ds = dp->ds;
 233
 234         if (ds->ops->port_mdb_del)
 235                 return ds->ops->port_mdb_del(ds, dp->index, mdb);
 236
 237         return -EOPNOTSUPP;
 238 }
 239
 240 int dsa_port_mdb_dump(struct dsa_port *dp, struct switchdev_obj_port_mdb *mdb,
 241                       switchdev_obj_dump_cb_t *cb)
 242 {
 243         struct dsa_switch *ds = dp->ds;
 244
 245         if (ds->ops->port_mdb_dump)
 246                 return ds->ops->port_mdb_dump(ds, dp->index, mdb, cb);
 247
 248         return -EOPNOTSUPP;
 249 }