net/dsa/dsa.c

   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_switch *ds, struct device *dev,
  71                       struct dsa_port *dport, int port)
  72 {
  73         struct device_node *port_dn = dport->dn;
  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(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, 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 int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
 116 {
 117         struct dsa_switch *ds = cpu_dp->ds;
 118         struct net_device *master;
 119         struct ethtool_ops *cpu_ops;
 120
 121         master = cpu_dp->netdev;
 122
 123         cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 124         if (!cpu_ops)
 125                 return -ENOMEM;
 126
 127         memcpy(&cpu_dp->ethtool_ops, master->ethtool_ops,
 128                sizeof(struct ethtool_ops));
 129         cpu_dp->orig_ethtool_ops = master->ethtool_ops;
 130         memcpy(cpu_ops, &cpu_dp->ethtool_ops,
 131                sizeof(struct ethtool_ops));
 132         dsa_cpu_port_ethtool_init(cpu_ops);
 133         master->ethtool_ops = cpu_ops;
 134
 135         return 0;
 136 }
 137
 138 void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
 139 {
 140         cpu_dp->netdev->ethtool_ops = cpu_dp->orig_ethtool_ops;
 141 }
 142
 143 void dsa_cpu_dsa_destroy(struct dsa_port *port)
 144 {
 145         struct device_node *port_dn = port->dn;
 146
 147         if (of_phy_is_fixed_link(port_dn))
 148                 of_phy_deregister_fixed_link(port_dn);
 149 }
 150
 151 static int dev_is_class(struct device *dev, void *class)
 152 {
 153         if (dev->class != NULL && !strcmp(dev->class->name, class))
 154                 return 1;
 155
 156         return 0;
 157 }
 158
 159 static struct device *dev_find_class(struct device *parent, char *class)
 160 {
 161         if (dev_is_class(parent, class)) {
 162                 get_device(parent);
 163                 return parent;
 164         }
 165
 166         return device_find_child(parent, class, dev_is_class);
 167 }
 168
 169 struct net_device *dsa_dev_to_net_device(struct device *dev)
 170 {
 171         struct device *d;
 172
 173         d = dev_find_class(dev, "net");
 174         if (d != NULL) {
 175                 struct net_device *nd;
 176
 177                 nd = to_net_dev(d);
 178                 dev_hold(nd);
 179                 put_device(d);
 180
 181                 return nd;
 182         }
 183
 184         return NULL;
 185 }
 186 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
 187
 188 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 189                           struct packet_type *pt, struct net_device *orig_dev)
 190 {
 191         struct dsa_switch_tree *dst = dev->dsa_ptr;
 192         struct sk_buff *nskb = NULL;
 193
 194         if (unlikely(dst == NULL)) {
 195                 kfree_skb(skb);
 196                 return 0;
 197         }
 198
 199         skb = skb_unshare(skb, GFP_ATOMIC);
 200         if (!skb)
 201                 return 0;
 202
 203         nskb = dst->rcv(skb, dev, pt, orig_dev);
 204         if (!nskb) {
 205                 kfree_skb(skb);
 206                 return 0;
 207         }
 208
 209         skb = nskb;
 210         skb_push(skb, ETH_HLEN);
 211         skb->pkt_type = PACKET_HOST;
 212         skb->protocol = eth_type_trans(skb, skb->dev);
 213
 214         skb->dev->stats.rx_packets++;
 215         skb->dev->stats.rx_bytes += skb->len;
 216
 217         netif_receive_skb(skb);
 218
 219         return 0;
 220 }
 221
 222 #ifdef CONFIG_PM_SLEEP
 223 int dsa_switch_suspend(struct dsa_switch *ds)
 224 {
 225         int i, ret = 0;
 226
 227         /* Suspend slave network devices */
 228         for (i = 0; i < ds->num_ports; i++) {
 229                 if (!dsa_is_port_initialized(ds, i))
 230                         continue;
 231
 232                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 233                 if (ret)
 234                         return ret;
 235         }
 236
 237         if (ds->ops->suspend)
 238                 ret = ds->ops->suspend(ds);
 239
 240         return ret;
 241 }
 242 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
 243
 244 int dsa_switch_resume(struct dsa_switch *ds)
 245 {
 246         int i, ret = 0;
 247
 248         if (ds->ops->resume)
 249                 ret = ds->ops->resume(ds);
 250
 251         if (ret)
 252                 return ret;
 253
 254         /* Resume slave network devices */
 255         for (i = 0; i < ds->num_ports; i++) {
 256                 if (!dsa_is_port_initialized(ds, i))
 257                         continue;
 258
 259                 ret = dsa_slave_resume(ds->ports[i].netdev);
 260                 if (ret)
 261                         return ret;
 262         }
 263
 264         return 0;
 265 }
 266 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 267 #endif
 268
 269 static struct packet_type dsa_pack_type __read_mostly = {
 270         .type   = cpu_to_be16(ETH_P_XDSA),
 271         .func   = dsa_switch_rcv,
 272 };
 273
 274 static int __init dsa_init_module(void)
 275 {
 276         int rc;
 277
 278         rc = dsa_slave_register_notifier();
 279         if (rc)
 280                 return rc;
 281
 282         rc = dsa_legacy_register();
 283         if (rc)
 284                 return rc;
 285
 286         dev_add_pack(&dsa_pack_type);
 287
 288         return 0;
 289 }
 290 module_init(dsa_init_module);
 291
 292 static void __exit dsa_cleanup_module(void)
 293 {
 294         dsa_slave_unregister_notifier();
 295         dev_remove_pack(&dsa_pack_type);
 296         dsa_legacy_unregister();
 297 }
 298 module_exit(dsa_cleanup_module);
 299
 300 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 301 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 302 MODULE_LICENSE("GPL");
 303 MODULE_ALIAS("platform:dsa");