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 } 270