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 } 274