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