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 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol) 72 { 73 const struct dsa_device_ops *ops; 74 75 if (tag_protocol >= DSA_TAG_LAST) 76 return ERR_PTR(-EINVAL); 77 ops = dsa_device_ops[tag_protocol]; 78 79 if (!ops) 80 return ERR_PTR(-ENOPROTOOPT); 81 82 return ops; 83 } 84 85 static int dev_is_class(struct device *dev, void *class) 86 { 87 if (dev->class != NULL && !strcmp(dev->class->name, class)) 88 return 1; 89 90 return 0; 91 } 92 93 static struct device *dev_find_class(struct device *parent, char *class) 94 { 95 if (dev_is_class(parent, class)) { 96 get_device(parent); 97 return parent; 98 } 99 100 return device_find_child(parent, class, dev_is_class); 101 } 102 103 struct net_device *dsa_dev_to_net_device(struct device *dev) 104 { 105 struct device *d; 106 107 d = dev_find_class(dev, "net"); 108 if (d != NULL) { 109 struct net_device *nd; 110 111 nd = to_net_dev(d); 112 dev_hold(nd); 113 put_device(d); 114 115 return nd; 116 } 117 118 return NULL; 119 } 120 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device); 121 122 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, 123 struct packet_type *pt, struct net_device *unused) 124 { 125 struct dsa_port *cpu_dp = dev->dsa_ptr; 126 struct sk_buff *nskb = NULL; 127 struct pcpu_sw_netstats *s; 128 struct dsa_slave_priv *p; 129 130 if (unlikely(!cpu_dp)) { 131 kfree_skb(skb); 132 return 0; 133 } 134 135 skb = skb_unshare(skb, GFP_ATOMIC); 136 if (!skb) 137 return 0; 138 139 nskb = cpu_dp->rcv(skb, dev, pt); 140 if (!nskb) { 141 kfree_skb(skb); 142 return 0; 143 } 144 145 skb = nskb; 146 p = netdev_priv(skb->dev); 147 skb_push(skb, ETH_HLEN); 148 skb->pkt_type = PACKET_HOST; 149 skb->protocol = eth_type_trans(skb, skb->dev); 150 151 s = this_cpu_ptr(p->stats64); 152 u64_stats_update_begin(&s->syncp); 153 s->rx_packets++; 154 s->rx_bytes += skb->len; 155 u64_stats_update_end(&s->syncp); 156 157 netif_receive_skb(skb); 158 159 return 0; 160 } 161 162 #ifdef CONFIG_PM_SLEEP 163 static bool dsa_is_port_initialized(struct dsa_switch *ds, int p) 164 { 165 return dsa_is_user_port(ds, p) && ds->ports[p].slave; 166 } 167 168 int dsa_switch_suspend(struct dsa_switch *ds) 169 { 170 int i, ret = 0; 171 172 /* Suspend slave network devices */ 173 for (i = 0; i < ds->num_ports; i++) { 174 if (!dsa_is_port_initialized(ds, i)) 175 continue; 176 177 ret = dsa_slave_suspend(ds->ports[i].slave); 178 if (ret) 179 return ret; 180 } 181 182 if (ds->ops->suspend) 183 ret = ds->ops->suspend(ds); 184 185 return ret; 186 } 187 EXPORT_SYMBOL_GPL(dsa_switch_suspend); 188 189 int dsa_switch_resume(struct dsa_switch *ds) 190 { 191 int i, ret = 0; 192 193 if (ds->ops->resume) 194 ret = ds->ops->resume(ds); 195 196 if (ret) 197 return ret; 198 199 /* Resume slave network devices */ 200 for (i = 0; i < ds->num_ports; i++) { 201 if (!dsa_is_port_initialized(ds, i)) 202 continue; 203 204 ret = dsa_slave_resume(ds->ports[i].slave); 205 if (ret) 206 return ret; 207 } 208 209 return 0; 210 } 211 EXPORT_SYMBOL_GPL(dsa_switch_resume); 212 #endif 213 214 static struct packet_type dsa_pack_type __read_mostly = { 215 .type = cpu_to_be16(ETH_P_XDSA), 216 .func = dsa_switch_rcv, 217 }; 218 219 static struct workqueue_struct *dsa_owq; 220 221 bool dsa_schedule_work(struct work_struct *work) 222 { 223 return queue_work(dsa_owq, work); 224 } 225 226 static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain); 227 228 int register_dsa_notifier(struct notifier_block *nb) 229 { 230 return atomic_notifier_chain_register(&dsa_notif_chain, nb); 231 } 232 EXPORT_SYMBOL_GPL(register_dsa_notifier); 233 234 int unregister_dsa_notifier(struct notifier_block *nb) 235 { 236 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb); 237 } 238 EXPORT_SYMBOL_GPL(unregister_dsa_notifier); 239 240 int call_dsa_notifiers(unsigned long val, struct net_device *dev, 241 struct dsa_notifier_info *info) 242 { 243 info->dev = dev; 244 return atomic_notifier_call_chain(&dsa_notif_chain, val, info); 245 } 246 EXPORT_SYMBOL_GPL(call_dsa_notifiers); 247 248 static int __init dsa_init_module(void) 249 { 250 int rc; 251 252 dsa_owq = alloc_ordered_workqueue("dsa_ordered", 253 WQ_MEM_RECLAIM); 254 if (!dsa_owq) 255 return -ENOMEM; 256 257 rc = dsa_slave_register_notifier(); 258 if (rc) 259 return rc; 260 261 rc = dsa_legacy_register(); 262 if (rc) 263 return rc; 264 265 dev_add_pack(&dsa_pack_type); 266 267 return 0; 268 } 269 module_init(dsa_init_module); 270 271 static void __exit dsa_cleanup_module(void) 272 { 273 dsa_slave_unregister_notifier(); 274 dev_remove_pack(&dsa_pack_type); 275 dsa_legacy_unregister(); 276 destroy_workqueue(dsa_owq); 277 } 278 module_exit(dsa_cleanup_module); 279 280 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); 281 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); 282 MODULE_LICENSE("GPL"); 283 MODULE_ALIAS("platform:dsa"); 284