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                 return 0;
 138         }
 139
 140         for_each_set_bit(port, group, ds->num_ports)
 141                 ds->ops->port_mdb_add(ds, port, mdb, trans);
 142
 143         return 0;
 144 }
 145
 146 static int dsa_switch_mdb_del(struct dsa_switch *ds,
 147                               struct dsa_notifier_mdb_info *info)
 148 {
 149         const struct switchdev_obj_port_mdb *mdb = info->mdb;
 150
 151         if (!ds->ops->port_mdb_del)
 152                 return -EOPNOTSUPP;
 153
 154         if (ds->index == info->sw_index)
 155                 return ds->ops->port_mdb_del(ds, info->port, mdb);
 156
 157         return 0;
 158 }
 159
 160 static int dsa_switch_vlan_add(struct dsa_switch *ds,
 161                                struct dsa_notifier_vlan_info *info)
 162 {
 163         const struct switchdev_obj_port_vlan *vlan = info->vlan;
 164         struct switchdev_trans *trans = info->trans;
 165         DECLARE_BITMAP(members, ds->num_ports);
 166         int port, err;
 167
 168         /* Build a mask of VLAN members */
 169         bitmap_zero(members, ds->num_ports);
 170         if (ds->index == info->sw_index)
 171                 set_bit(info->port, members);
 172         for (port = 0; port < ds->num_ports; port++)
 173                 if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
 174                         set_bit(port, members);
 175
 176         if (switchdev_trans_ph_prepare(trans)) {
 177                 if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
 178                         return -EOPNOTSUPP;
 179
 180                 for_each_set_bit(port, members, ds->num_ports) {
 181                         err = ds->ops->port_vlan_prepare(ds, port, vlan, trans);
 182                         if (err)
 183                                 return err;
 184                 }
 185
 186                 return 0;
 187         }
 188
 189         for_each_set_bit(port, members, ds->num_ports)
 190                 ds->ops->port_vlan_add(ds, port, vlan, trans);
 191
 192         return 0;
 193 }
 194
 195 static int dsa_switch_vlan_del(struct dsa_switch *ds,
 196                                struct dsa_notifier_vlan_info *info)
 197 {
 198         const struct switchdev_obj_port_vlan *vlan = info->vlan;
 199
 200         if (!ds->ops->port_vlan_del)
 201                 return -EOPNOTSUPP;
 202
 203         if (ds->index == info->sw_index)
 204                 return ds->ops->port_vlan_del(ds, info->port, vlan);
 205
 206         return 0;
 207 }
 208
 209 static int dsa_switch_event(struct notifier_block *nb,
 210                             unsigned long event, void *info)
 211 {
 212         struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
 213         int err;
 214
 215         switch (event) {
 216         case DSA_NOTIFIER_AGEING_TIME:
 217                 err = dsa_switch_ageing_time(ds, info);
 218                 break;
 219         case DSA_NOTIFIER_BRIDGE_JOIN:
 220                 err = dsa_switch_bridge_join(ds, info);
 221                 break;
 222         case DSA_NOTIFIER_BRIDGE_LEAVE:
 223                 err = dsa_switch_bridge_leave(ds, info);
 224                 break;
 225         case DSA_NOTIFIER_FDB_ADD:
 226                 err = dsa_switch_fdb_add(ds, info);
 227                 break;
 228         case DSA_NOTIFIER_FDB_DEL:
 229                 err = dsa_switch_fdb_del(ds, info);
 230                 break;
 231         case DSA_NOTIFIER_MDB_ADD:
 232                 err = dsa_switch_mdb_add(ds, info);
 233                 break;
 234         case DSA_NOTIFIER_MDB_DEL:
 235                 err = dsa_switch_mdb_del(ds, info);
 236                 break;
 237         case DSA_NOTIFIER_VLAN_ADD:
 238                 err = dsa_switch_vlan_add(ds, info);
 239                 break;
 240         case DSA_NOTIFIER_VLAN_DEL:
 241                 err = dsa_switch_vlan_del(ds, info);
 242                 break;
 243         default:
 244                 err = -EOPNOTSUPP;
 245                 break;
 246         }
 247
 248         /* Non-switchdev operations cannot be rolled back. If a DSA driver
 249          * returns an error during the chained call, switch chips may be in an
 250          * inconsistent state.
 251          */
 252         if (err)
 253                 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
 254                         event, err);
 255
 256         return notifier_from_errno(err);
 257 }
 258
 259 int dsa_switch_register_notifier(struct dsa_switch *ds)
 260 {
 261         ds->nb.notifier_call = dsa_switch_event;
 262
 263         return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
 264 }
 265
 266 void dsa_switch_unregister_notifier(struct dsa_switch *ds)
 267 {
 268         int err;
 269
 270         err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
 271         if (err)
 272                 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
 273 }