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 } 305