2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
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.
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>
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>
31 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
32 struct net_device *dev)
34 /* Just return the original SKB */
38 static const struct dsa_device_ops none_ops = {
39 .xmit = dsa_slave_notag_xmit,
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,
47 #ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
48 [DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops,
50 #ifdef CONFIG_NET_DSA_TAG_DSA
51 [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
53 #ifdef CONFIG_NET_DSA_TAG_EDSA
54 [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
56 #ifdef CONFIG_NET_DSA_TAG_KSZ
57 [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
59 #ifdef CONFIG_NET_DSA_TAG_LAN9303
60 [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
62 #ifdef CONFIG_NET_DSA_TAG_MTK
63 [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
65 #ifdef CONFIG_NET_DSA_TAG_QCA
66 [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
68 #ifdef CONFIG_NET_DSA_TAG_TRAILER
69 [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
71 [DSA_TAG_PROTO_NONE] = &none_ops,
74 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
76 const struct dsa_device_ops *ops;
78 if (tag_protocol >= DSA_TAG_LAST)
79 return ERR_PTR(-EINVAL);
80 ops = dsa_device_ops[tag_protocol];
83 return ERR_PTR(-ENOPROTOOPT);
88 static int dev_is_class(struct device *dev, void *class)
90 if (dev->class != NULL && !strcmp(dev->class->name, class))
96 static struct device *dev_find_class(struct device *parent, char *class)
98 if (dev_is_class(parent, class)) {
103 return device_find_child(parent, class, dev_is_class);
106 struct net_device *dsa_dev_to_net_device(struct device *dev)
110 d = dev_find_class(dev, "net");
112 struct net_device *nd;
123 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
125 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
126 struct packet_type *pt, struct net_device *unused)
128 struct dsa_port *cpu_dp = dev->dsa_ptr;
129 struct sk_buff *nskb = NULL;
130 struct pcpu_sw_netstats *s;
131 struct dsa_slave_priv *p;
133 if (unlikely(!cpu_dp)) {
138 skb = skb_unshare(skb, GFP_ATOMIC);
142 nskb = cpu_dp->rcv(skb, dev, pt);
149 p = netdev_priv(skb->dev);
150 skb_push(skb, ETH_HLEN);
151 skb->pkt_type = PACKET_HOST;
152 skb->protocol = eth_type_trans(skb, skb->dev);
154 s = this_cpu_ptr(p->stats64);
155 u64_stats_update_begin(&s->syncp);
157 s->rx_bytes += skb->len;
158 u64_stats_update_end(&s->syncp);
160 netif_receive_skb(skb);
165 #ifdef CONFIG_PM_SLEEP
166 static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
168 return dsa_is_user_port(ds, p) && ds->ports[p].slave;
171 int dsa_switch_suspend(struct dsa_switch *ds)
175 /* Suspend slave network devices */
176 for (i = 0; i < ds->num_ports; i++) {
177 if (!dsa_is_port_initialized(ds, i))
180 ret = dsa_slave_suspend(ds->ports[i].slave);
185 if (ds->ops->suspend)
186 ret = ds->ops->suspend(ds);
190 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
192 int dsa_switch_resume(struct dsa_switch *ds)
197 ret = ds->ops->resume(ds);
202 /* Resume slave network devices */
203 for (i = 0; i < ds->num_ports; i++) {
204 if (!dsa_is_port_initialized(ds, i))
207 ret = dsa_slave_resume(ds->ports[i].slave);
214 EXPORT_SYMBOL_GPL(dsa_switch_resume);
217 static struct packet_type dsa_pack_type __read_mostly = {
218 .type = cpu_to_be16(ETH_P_XDSA),
219 .func = dsa_switch_rcv,
222 static struct workqueue_struct *dsa_owq;
224 bool dsa_schedule_work(struct work_struct *work)
226 return queue_work(dsa_owq, work);
229 static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);
231 int register_dsa_notifier(struct notifier_block *nb)
233 return atomic_notifier_chain_register(&dsa_notif_chain, nb);
235 EXPORT_SYMBOL_GPL(register_dsa_notifier);
237 int unregister_dsa_notifier(struct notifier_block *nb)
239 return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
241 EXPORT_SYMBOL_GPL(unregister_dsa_notifier);
243 int call_dsa_notifiers(unsigned long val, struct net_device *dev,
244 struct dsa_notifier_info *info)
247 return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
249 EXPORT_SYMBOL_GPL(call_dsa_notifiers);
251 static int __init dsa_init_module(void)
255 dsa_owq = alloc_ordered_workqueue("dsa_ordered",
260 rc = dsa_slave_register_notifier();
264 rc = dsa_legacy_register();
268 dev_add_pack(&dsa_pack_type);
272 module_init(dsa_init_module);
274 static void __exit dsa_cleanup_module(void)
276 dsa_slave_unregister_notifier();
277 dev_remove_pack(&dsa_pack_type);
278 dsa_legacy_unregister();
279 destroy_workqueue(dsa_owq);
281 module_exit(dsa_cleanup_module);
284 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
285 MODULE_LICENSE("GPL");
286 MODULE_ALIAS("platform:dsa");