1 /* 2 * net/dsa/dsa.c - Hardware switch handling 3 * Copyright (c) 2008-2009 Marvell Semiconductor 4 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/device.h> 13 #include <linux/list.h> 14 #include <linux/platform_device.h> 15 #include <linux/slab.h> 16 #include <linux/module.h> 17 #include <linux/notifier.h> 18 #include <linux/of.h> 19 #include <linux/of_mdio.h> 20 #include <linux/of_platform.h> 21 #include <linux/of_net.h> 22 #include <linux/of_gpio.h> 23 #include <linux/netdevice.h> 24 #include <linux/sysfs.h> 25 #include <linux/phy_fixed.h> 26 #include <linux/gpio/consumer.h> 27 #include <linux/etherdevice.h> 28 29 #include "dsa_priv.h" 30 31 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb, 32 struct net_device *dev) 33 { 34 /* Just return the original SKB */ 35 return skb; 36 } 37 38 static const struct dsa_device_ops none_ops = { 39 .xmit = dsa_slave_notag_xmit, 40 .rcv = NULL, 41 }; 42 43 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = { 44 #ifdef CONFIG_NET_DSA_TAG_BRCM 45 [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops, 46 #endif 47 #ifdef CONFIG_NET_DSA_TAG_DSA 48 [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops, 49 #endif 50 #ifdef CONFIG_NET_DSA_TAG_EDSA 51 [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops, 52 #endif 53 #ifdef CONFIG_NET_DSA_TAG_KSZ 54 [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops, 55 #endif 56 #ifdef CONFIG_NET_DSA_TAG_LAN9303 57 [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops, 58 #endif 59 #ifdef CONFIG_NET_DSA_TAG_MTK 60 [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops, 61 #endif 62 #ifdef CONFIG_NET_DSA_TAG_QCA 63 [DSA_TAG_PROTO_QCA] = &qca_netdev_ops, 64 #endif 65 #ifdef CONFIG_NET_DSA_TAG_TRAILER 66 [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops, 67 #endif 68 [DSA_TAG_PROTO_NONE] = &none_ops, 69 }; 70 71 int dsa_cpu_dsa_setup(struct dsa_port *port) 72 { 73 struct device_node *port_dn = port->dn; 74 struct dsa_switch *ds = port->ds; 75 struct phy_device *phydev; 76 int ret, mode; 77 78 if (of_phy_is_fixed_link(port_dn)) { 79 ret = of_phy_register_fixed_link(port_dn); 80 if (ret) { 81 dev_err(ds->dev, "failed to register fixed PHY\n"); 82 return ret; 83 } 84 phydev = of_phy_find_device(port_dn); 85 86 mode = of_get_phy_mode(port_dn); 87 if (mode < 0) 88 mode = PHY_INTERFACE_MODE_NA; 89 phydev->interface = mode; 90 91 genphy_config_init(phydev); 92 genphy_read_status(phydev); 93 if (ds->ops->adjust_link) 94 ds->ops->adjust_link(ds, port->index, phydev); 95 96 put_device(&phydev->mdio.dev); 97 } 98 99 return 0; 100 } 101 102 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol) 103 { 104 const struct dsa_device_ops *ops; 105 106 if (tag_protocol >= DSA_TAG_LAST) 107 return ERR_PTR(-EINVAL); 108 ops = dsa_device_ops[tag_protocol]; 109 110 if (!ops) 111 return ERR_PTR(-ENOPROTOOPT); 112 113 return ops; 114 } 115 116 void dsa_cpu_dsa_destroy(struct dsa_port *port) 117 { 118 struct device_node *port_dn = port->dn; 119 120 if (of_phy_is_fixed_link(port_dn)) 121 of_phy_deregister_fixed_link(port_dn); 122 } 123 124 static int dev_is_class(struct device *dev, void *class) 125 { 126 if (dev->class != NULL && !strcmp(dev->class->name, class)) 127 return 1; 128 129 return 0; 130 } 131 132 static struct device *dev_find_class(struct device *parent, char *class) 133 { 134 if (dev_is_class(parent, class)) { 135 get_device(parent); 136 return parent; 137 } 138 139 return device_find_child(parent, class, dev_is_class); 140 } 141 142 struct net_device *dsa_dev_to_net_device(struct device *dev) 143 { 144 struct device *d; 145 146 d = dev_find_class(dev, "net"); 147 if (d != NULL) { 148 struct net_device *nd; 149 150 nd = to_net_dev(d); 151 dev_hold(nd); 152 put_device(d); 153 154 return nd; 155 } 156 157 return NULL; 158 } 159 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device); 160 161 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, 162 struct packet_type *pt, struct net_device *unused) 163 { 164 struct dsa_port *cpu_dp = dev->dsa_ptr; 165 struct sk_buff *nskb = NULL; 166 struct pcpu_sw_netstats *s; 167 struct dsa_slave_priv *p; 168 169 if (unlikely(!cpu_dp)) { 170 kfree_skb(skb); 171 return 0; 172 } 173 174 skb = skb_unshare(skb, GFP_ATOMIC); 175 if (!skb) 176 return 0; 177 178 nskb = cpu_dp->rcv(skb, dev, pt); 179 if (!nskb) { 180 kfree_skb(skb); 181 return 0; 182 } 183 184 skb = nskb; 185 p = netdev_priv(skb->dev); 186 skb_push(skb, ETH_HLEN); 187 skb->pkt_type = PACKET_HOST; 188 skb->protocol = eth_type_trans(skb, skb->dev); 189 190 s = this_cpu_ptr(p->stats64); 191 u64_stats_update_begin(&s->syncp); 192 s->rx_packets++; 193 s->rx_bytes += skb->len; 194 u64_stats_update_end(&s->syncp); 195 196 netif_receive_skb(skb); 197 198 return 0; 199 } 200 201 #ifdef CONFIG_PM_SLEEP 202 static bool dsa_is_port_initialized(struct dsa_switch *ds, int p) 203 { 204 return ds->enabled_port_mask & (1 << p) && ds->ports[p].slave; 205 } 206 207 int dsa_switch_suspend(struct dsa_switch *ds) 208 { 209 int i, ret = 0; 210 211 /* Suspend slave network devices */ 212 for (i = 0; i < ds->num_ports; i++) { 213 if (!dsa_is_port_initialized(ds, i)) 214 continue; 215 216 ret = dsa_slave_suspend(ds->ports[i].slave); 217 if (ret) 218 return ret; 219 } 220 221 if (ds->ops->suspend) 222 ret = ds->ops->suspend(ds); 223 224 return ret; 225 } 226 EXPORT_SYMBOL_GPL(dsa_switch_suspend); 227 228 int dsa_switch_resume(struct dsa_switch *ds) 229 { 230 int i, ret = 0; 231 232 if (ds->ops->resume) 233 ret = ds->ops->resume(ds); 234 235 if (ret) 236 return ret; 237 238 /* Resume slave network devices */ 239 for (i = 0; i < ds->num_ports; i++) { 240 if (!dsa_is_port_initialized(ds, i)) 241 continue; 242 243 ret = dsa_slave_resume(ds->ports[i].slave); 244 if (ret) 245 return ret; 246 } 247 248 return 0; 249 } 250 EXPORT_SYMBOL_GPL(dsa_switch_resume); 251 #endif 252 253 static struct packet_type dsa_pack_type __read_mostly = { 254 .type = cpu_to_be16(ETH_P_XDSA), 255 .func = dsa_switch_rcv, 256 }; 257 258 static struct workqueue_struct *dsa_owq; 259 260 bool dsa_schedule_work(struct work_struct *work) 261 { 262 return queue_work(dsa_owq, work); 263 } 264 265 static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain); 266 267 int register_dsa_notifier(struct notifier_block *nb) 268 { 269 return atomic_notifier_chain_register(&dsa_notif_chain, nb); 270 } 271 EXPORT_SYMBOL_GPL(register_dsa_notifier); 272 273 int unregister_dsa_notifier(struct notifier_block *nb) 274 { 275 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb); 276 } 277 EXPORT_SYMBOL_GPL(unregister_dsa_notifier); 278 279 int call_dsa_notifiers(unsigned long val, struct net_device *dev, 280 struct dsa_notifier_info *info) 281 { 282 info->dev = dev; 283 return atomic_notifier_call_chain(&dsa_notif_chain, val, info); 284 } 285 EXPORT_SYMBOL_GPL(call_dsa_notifiers); 286 287 static int __init dsa_init_module(void) 288 { 289 int rc; 290 291 dsa_owq = alloc_ordered_workqueue("dsa_ordered", 292 WQ_MEM_RECLAIM); 293 if (!dsa_owq) 294 return -ENOMEM; 295 296 rc = dsa_slave_register_notifier(); 297 if (rc) 298 return rc; 299 300 rc = dsa_legacy_register(); 301 if (rc) 302 return rc; 303 304 dev_add_pack(&dsa_pack_type); 305 306 return 0; 307 } 308 module_init(dsa_init_module); 309 310 static void __exit dsa_cleanup_module(void) 311 { 312 dsa_slave_unregister_notifier(); 313 dev_remove_pack(&dsa_pack_type); 314 dsa_legacy_unregister(); 315 destroy_workqueue(dsa_owq); 316 } 317 module_exit(dsa_cleanup_module); 318 319 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); 320 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); 321 MODULE_LICENSE("GPL"); 322 MODULE_ALIAS("platform:dsa"); 323