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         int port = dsa_towards_port(ds, info->sw_index, info->port);
  87
  88         if (!ds->ops->port_fdb_add)
  89                 return -EOPNOTSUPP;
  90
  91         return ds->ops->port_fdb_add(ds, port, info->addr, info->vid);
  92 }
  93
  94 static int dsa_switch_fdb_del(struct dsa_switch *ds,
  95                               struct dsa_notifier_fdb_info *info)
  96 {
  97         int port = dsa_towards_port(ds, info->sw_index, info->port);
  98
  99         if (!ds->ops->port_fdb_del)
 100                 return -EOPNOTSUPP;
 101
 102         return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
 103 }
 104
 105 static int
 106 dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
 107                               const struct switchdev_obj_port_mdb *mdb,
 108                               const unsigned long *bitmap)
 109 {
 110         int port, err;
 111
 112         if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
 113                 return -EOPNOTSUPP;
 114
 115         for_each_set_bit(port, bitmap, ds->num_ports) {
 116                 err = ds->ops->port_mdb_prepare(ds, port, mdb);
 117                 if (err)
 118                         return err;
 119         }
 120
 121         return 0;
 122 }
 123
 124 static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
 125                                       const struct switchdev_obj_port_mdb *mdb,
 126                                       const unsigned long *bitmap)
 127 {
 128         int port;
 129
 130         for_each_set_bit(port, bitmap, ds->num_ports)
 131                 ds->ops->port_mdb_add(ds, port, mdb);
 132 }
 133
 134 static int dsa_switch_mdb_add(struct dsa_switch *ds,
 135                               struct dsa_notifier_mdb_info *info)
 136 {
 137         const struct switchdev_obj_port_mdb *mdb = info->mdb;
 138         struct switchdev_trans *trans = info->trans;
 139         DECLARE_BITMAP(group, ds->num_ports);
 140         int port;
 141
 142         /* Build a mask of Multicast group members */
 143         bitmap_zero(group, ds->num_ports);
 144         if (ds->index == info->sw_index)
 145                 set_bit(info->port, group);
 146         for (port = 0; port < ds->num_ports; port++)
 147                 if (dsa_is_dsa_port(ds, port))
 148                         set_bit(port, group);
 149
 150         if (switchdev_trans_ph_prepare(trans))
 151                 return dsa_switch_mdb_prepare_bitmap(ds, mdb, group);
 152
 153         dsa_switch_mdb_add_bitmap(ds, mdb, group);
 154
 155         return 0;
 156 }
 157
 158 static int dsa_switch_mdb_del(struct dsa_switch *ds,
 159                               struct dsa_notifier_mdb_info *info)
 160 {
 161         const struct switchdev_obj_port_mdb *mdb = info->mdb;
 162
 163         if (!ds->ops->port_mdb_del)
 164                 return -EOPNOTSUPP;
 165
 166         if (ds->index == info->sw_index)
 167                 return ds->ops->port_mdb_del(ds, info->port, mdb);
 168
 169         return 0;
 170 }
 171
 172 static int
 173 dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
 174                                const struct switchdev_obj_port_vlan *vlan,
 175                                const unsigned long *bitmap)
 176 {
 177         int port, err;
 178
 179         if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 180                 return -EOPNOTSUPP;
 181
 182         for_each_set_bit(port, bitmap, ds->num_ports) {
 183                 err = ds->ops->port_vlan_prepare(ds, port, vlan);
 184                 if (err)
 185                         return err;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static void
 192 dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
 193                            const struct switchdev_obj_port_vlan *vlan,
 194                            const unsigned long *bitmap)
 195 {
 196         int port;
 197
 198         for_each_set_bit(port, bitmap, ds->num_ports)
 199                 ds->ops->port_vlan_add(ds, port, vlan);
 200 }
 201
 202 static int dsa_switch_vlan_add(struct dsa_switch *ds,
 203                                struct dsa_notifier_vlan_info *info)
 204 {
 205         const struct switchdev_obj_port_vlan *vlan = info->vlan;
 206         struct switchdev_trans *trans = info->trans;
 207         DECLARE_BITMAP(members, ds->num_ports);
 208         int port;
 209
 210         /* Build a mask of VLAN members */
 211         bitmap_zero(members, ds->num_ports);
 212         if (ds->index == info->sw_index)
 213                 set_bit(info->port, members);
 214         for (port = 0; port < ds->num_ports; port++)
 215                 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
 216                         set_bit(port, members);
 217
 218         if (switchdev_trans_ph_prepare(trans))
 219                 return dsa_switch_vlan_prepare_bitmap(ds, vlan, members);
 220
 221         dsa_switch_vlan_add_bitmap(ds, vlan, members);
 222
 223         return 0;
 224 }
 225
 226 static int dsa_switch_vlan_del(struct dsa_switch *ds,
 227                                struct dsa_notifier_vlan_info *info)
 228 {
 229         const struct switchdev_obj_port_vlan *vlan = info->vlan;
 230
 231         if (!ds->ops->port_vlan_del)
 232                 return -EOPNOTSUPP;
 233
 234         if (ds->index == info->sw_index)
 235                 return ds->ops->port_vlan_del(ds, info->port, vlan);
 236
 237         return 0;
 238 }
 239
 240 static int dsa_switch_event(struct notifier_block *nb,
 241                             unsigned long event, void *info)
 242 {
 243         struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
 244         int err;
 245
 246         switch (event) {
 247         case DSA_NOTIFIER_AGEING_TIME:
 248                 err = dsa_switch_ageing_time(ds, info);
 249                 break;
 250         case DSA_NOTIFIER_BRIDGE_JOIN:
 251                 err = dsa_switch_bridge_join(ds, info);
 252                 break;
 253         case DSA_NOTIFIER_BRIDGE_LEAVE:
 254                 err = dsa_switch_bridge_leave(ds, info);
 255                 break;
 256         case DSA_NOTIFIER_FDB_ADD:
 257                 err = dsa_switch_fdb_add(ds, info);
 258                 break;
 259         case DSA_NOTIFIER_FDB_DEL:
 260                 err = dsa_switch_fdb_del(ds, info);
 261                 break;
 262         case DSA_NOTIFIER_MDB_ADD:
 263                 err = dsa_switch_mdb_add(ds, info);
 264                 break;
 265         case DSA_NOTIFIER_MDB_DEL:
 266                 err = dsa_switch_mdb_del(ds, info);
 267                 break;
 268         case DSA_NOTIFIER_VLAN_ADD:
 269                 err = dsa_switch_vlan_add(ds, info);
 270                 break;
 271         case DSA_NOTIFIER_VLAN_DEL:
 272                 err = dsa_switch_vlan_del(ds, info);
 273                 break;
 274         default:
 275                 err = -EOPNOTSUPP;
 276                 break;
 277         }
 278
 279         /* Non-switchdev operations cannot be rolled back. If a DSA driver
 280          * returns an error during the chained call, switch chips may be in an
 281          * inconsistent state.
 282          */
 283         if (err)
 284                 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
 285                         event, err);
 286
 287         return notifier_from_errno(err);
 288 }
 289
 290 int dsa_switch_register_notifier(struct dsa_switch *ds)
 291 {
 292         ds->nb.notifier_call = dsa_switch_event;
 293
 294         return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
 295 }
 296
 297 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
 298 {
 299         int err;
 300
 301         err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
 302         if (err)
 303                 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
 304 }