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