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 } 279