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