net/dsa/switch.c

   1 /*
   2  * Handling of a single switch chip, part of a switch fabric
   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/netdevice.h>
  14 #include <linux/notifier.h>
  15 #include <net/switchdev.h>
  16
  17 #include "dsa_priv.h"
  18
  19 static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
  20                                                    unsigned int ageing_time)
  21 {
  22         int i;
  23
  24         for (i = 0; i < ds->num_ports; ++i) {
  25                 struct dsa_port *dp = &ds->ports[i];
  26
  27                 if (dp->ageing_time && dp->ageing_time < ageing_time)
  28                         ageing_time = dp->ageing_time;
  29         }
  30
  31         return ageing_time;
  32 }
  33
  34 static int dsa_switch_ageing_time(struct dsa_switch *ds,
  35                                   struct dsa_notifier_ageing_time_info *info)
  36 {
  37         unsigned int ageing_time = info->ageing_time;
  38         struct switchdev_trans *trans = info->trans;
  39
  40         if (switchdev_trans_ph_prepare(trans)) {
  41                 if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
  42                         return -ERANGE;
  43                 if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
  44                         return -ERANGE;
  45                 return 0;
  46         }
  47
  48         /* Program the fastest ageing time in case of multiple bridges */
  49         ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
  50
  51         if (ds->ops->set_ageing_time)
  52                 return ds->ops->set_ageing_time(ds, ageing_time);
  53
  54         return 0;
  55 }
  56
  57 static int dsa_switch_bridge_join(struct dsa_switch *ds,
  58                                   struct dsa_notifier_bridge_info *info)
  59 {
  60         if (ds->index == info->sw_index && ds->ops->port_bridge_join)
  61                 return ds->ops->port_bridge_join(ds, info->port, info->br);
  62
  63         if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
  64                 return ds->ops->crosschip_bridge_join(ds, info->sw_index,
  65                                                       info->port, info->br);
  66
  67         return 0;
  68 }
  69
  70 static int dsa_switch_bridge_leave(struct dsa_switch *ds,
  71                                    struct dsa_notifier_bridge_info *info)
  72 {
  73         if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
  74                 ds->ops->port_bridge_leave(ds, info->port, info->br);
  75
  76         if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
  77                 ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
  78                                                 info->br);
  79
  80         return 0;
  81 }
  82
  83 static int dsa_switch_fdb_add(struct dsa_switch *ds,
  84                               struct dsa_notifier_fdb_info *info)
  85 {
  86         const struct switchdev_obj_port_fdb *fdb = info->fdb;
  87
  88         /* Do not care yet about other switch chips of the fabric */
  89         if (ds->index != info->sw_index)
  90                 return 0;
  91
  92         if (!ds->ops->port_fdb_add)
  93                 return -EOPNOTSUPP;
  94
  95         return ds->ops->port_fdb_add(ds, info->port, fdb->addr, fdb->vid);
  96 }
  97
  98 static int dsa_switch_fdb_del(struct dsa_switch *ds,
  99                               struct dsa_notifier_fdb_info *info)
 100 {
 101         const struct switchdev_obj_port_fdb *fdb = info->fdb;
 102
 103         /* Do not care yet about other switch chips of the fabric */
 104         if (ds->index != info->sw_index)
 105                 return 0;
 106
 107         if (!ds->ops->port_fdb_del)
 108                 return -EOPNOTSUPP;
 109
 110         return ds->ops->port_fdb_del(ds, info->port, fdb->addr,
 111                                      fdb->vid);
 112 }
 113
 114 static int dsa_switch_mdb_add(struct dsa_switch *ds,
 115                               struct dsa_notifier_mdb_info *info)
 116 {
 117         const struct switchdev_obj_port_mdb *mdb = info->mdb;
 118         struct switchdev_trans *trans = info->trans;
 119         DECLARE_BITMAP(group, ds->num_ports);
 120         int port, err;
 121
 122         /* Build a mask of Multicast group members */
 123         bitmap_zero(group, ds->num_ports);
 124         if (ds->index == info->sw_index)
 125                 set_bit(info->port, group);
 126         for (port = 0; port < ds->num_ports; port++)
 127                 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
 128                         set_bit(port, group);
 129
 130         if (switchdev_trans_ph_prepare(trans)) {
 131                 if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 132                         return -EOPNOTSUPP;
 133
 134                 for_each_set_bit(port, group, ds->num_ports) {
 135                         err = ds->ops->port_mdb_prepare(ds, port, mdb, trans);
 136                         if (err)
 137                                 return err;
 138                 }
 139         }
 140
 141         for_each_set_bit(port, group, ds->num_ports)
 142                 ds->ops->port_mdb_add(ds, port, mdb, trans);
 143
 144         return 0;
 145 }
 146
 147 static int dsa_switch_mdb_del(struct dsa_switch *ds,
 148                               struct dsa_notifier_mdb_info *info)
 149 {
 150         const struct switchdev_obj_port_mdb *mdb = info->mdb;
 151
 152         if (!ds->ops->port_mdb_del)
 153                 return -EOPNOTSUPP;
 154
 155         if (ds->index == info->sw_index)
 156                 return ds->ops->port_mdb_del(ds, info->port, mdb);
 157
 158         return 0;
 159 }
 160
 161 static int dsa_switch_vlan_add(struct dsa_switch *ds,
 162                                struct dsa_notifier_vlan_info *info)
 163 {
 164         const struct switchdev_obj_port_vlan *vlan = info->vlan;
 165         struct switchdev_trans *trans = info->trans;
 166         DECLARE_BITMAP(members, ds->num_ports);
 167         int port, err;
 168
 169         /* Build a mask of VLAN members */
 170         bitmap_zero(members, ds->num_ports);
 171         if (ds->index == info->sw_index)
 172                 set_bit(info->port, members);
 173         for (port = 0; port < ds->num_ports; port++)
 174                 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
 175                         set_bit(port, members);
 176
 177         if (switchdev_trans_ph_prepare(trans)) {
 178                 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 179                         return -EOPNOTSUPP;
 180
 181                 for_each_set_bit(port, members, ds->num_ports) {
 182                         err = ds->ops->port_vlan_prepare(ds, port, vlan, trans);
 183                         if (err)
 184                                 return err;
 185                 }
 186         }
 187
 188         for_each_set_bit(port, members, ds->num_ports)
 189                 ds->ops->port_vlan_add(ds, port, vlan, trans);
 190
 191         return 0;
 192 }
 193
 194 static int dsa_switch_vlan_del(struct dsa_switch *ds,
 195                                struct dsa_notifier_vlan_info *info)
 196 {
 197         const struct switchdev_obj_port_vlan *vlan = info->vlan;
 198
 199         if (!ds->ops->port_vlan_del)
 200                 return -EOPNOTSUPP;
 201
 202         if (ds->index == info->sw_index)
 203                 return ds->ops->port_vlan_del(ds, info->port, vlan);
 204
 205         return 0;
 206 }
 207
 208 static int dsa_switch_event(struct notifier_block *nb,
 209                             unsigned long event, void *info)
 210 {
 211         struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
 212         int err;
 213
 214         switch (event) {
 215         case DSA_NOTIFIER_AGEING_TIME:
 216                 err = dsa_switch_ageing_time(ds, info);
 217                 break;
 218         case DSA_NOTIFIER_BRIDGE_JOIN:
 219                 err = dsa_switch_bridge_join(ds, info);
 220                 break;
 221         case DSA_NOTIFIER_BRIDGE_LEAVE:
 222                 err = dsa_switch_bridge_leave(ds, info);
 223                 break;
 224         case DSA_NOTIFIER_FDB_ADD:
 225                 err = dsa_switch_fdb_add(ds, info);
 226                 break;
 227         case DSA_NOTIFIER_FDB_DEL:
 228                 err = dsa_switch_fdb_del(ds, info);
 229                 break;
 230         case DSA_NOTIFIER_MDB_ADD:
 231                 err = dsa_switch_mdb_add(ds, info);
 232                 break;
 233         case DSA_NOTIFIER_MDB_DEL:
 234                 err = dsa_switch_mdb_del(ds, info);
 235                 break;
 236         case DSA_NOTIFIER_VLAN_ADD:
 237                 err = dsa_switch_vlan_add(ds, info);
 238                 break;
 239         case DSA_NOTIFIER_VLAN_DEL:
 240                 err = dsa_switch_vlan_del(ds, info);
 241                 break;
 242         default:
 243                 err = -EOPNOTSUPP;
 244                 break;
 245         }
 246
 247         /* Non-switchdev operations cannot be rolled back. If a DSA driver
 248          * returns an error during the chained call, switch chips may be in an
 249          * inconsistent state.
 250          */
 251         if (err)
 252                 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
 253                         event, err);
 254
 255         return notifier_from_errno(err);
 256 }
 257
 258 int dsa_switch_register_notifier(struct dsa_switch *ds)
 259 {
 260         ds->nb.notifier_call = dsa_switch_event;
 261
 262         return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
 263 }
 264
 265 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
 266 {
 267         int err;
 268
 269         err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
 270         if (err)
 271                 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
 272 }