/* * net/dsa/dsa.c - Hardware switch handling * Copyright (c) 2008-2009 Marvell Semiconductor * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/device.h> #include <linux/list.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/notifier.h> #include <linux/of.h> #include <linux/of_mdio.h> #include <linux/of_platform.h> #include <linux/of_net.h> #include <linux/of_gpio.h> #include <linux/netdevice.h> #include <linux/sysfs.h> #include <linux/phy_fixed.h> #include <linux/ptp_classify.h> #include <linux/gpio/consumer.h> #include <linux/etherdevice.h> #include "dsa_priv.h" static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb, struct net_device *dev) { /* Just return the original SKB */ return skb; } static const struct dsa_device_ops none_ops = { .xmit = dsa_slave_notag_xmit, .rcv = NULL, }; const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = { #ifdef CONFIG_NET_DSA_TAG_BRCM [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND [DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_DSA [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_EDSA [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_KSZ [DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_LAN9303 [DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_MTK [DSA_TAG_PROTO_MTK] = &mtk_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_QCA [DSA_TAG_PROTO_QCA] = &qca_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_TRAILER [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops, #endif [DSA_TAG_PROTO_NONE] = &none_ops, }; const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol) { const struct dsa_device_ops *ops; if (tag_protocol >= DSA_TAG_LAST) return ERR_PTR(-EINVAL); ops = dsa_device_ops[tag_protocol]; if (!ops) return ERR_PTR(-ENOPROTOOPT); return ops; } static int dev_is_class(struct device *dev, void *class) { if (dev->class != NULL && !strcmp(dev->class->name, class)) return 1; return 0; } static struct device *dev_find_class(struct device *parent, char *class) { if (dev_is_class(parent, class)) { get_device(parent); return parent; } return device_find_child(parent, class, dev_is_class); } struct net_device *dsa_dev_to_net_device(struct device *dev) { struct device *d; d = dev_find_class(dev, "net"); if (d != NULL) { struct net_device *nd; nd = to_net_dev(d); dev_hold(nd); put_device(d); return nd; } return NULL; } EXPORT_SYMBOL_GPL(dsa_dev_to_net_device); /* Determine if we should defer delivery of skb until we have a rx timestamp. * * Called from dsa_switch_rcv. For now, this will only work if tagging is * enabled on the switch. Normally the MAC driver would retrieve the hardware * timestamp when it reads the packet out of the hardware. However in a DSA * switch, the DSA driver owning the interface to which the packet is * delivered is never notified unless we do so here. */ static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p, struct sk_buff *skb) { struct dsa_switch *ds = p->dp->ds; unsigned int type; if (skb_headroom(skb) < ETH_HLEN) return false; __skb_push(skb, ETH_HLEN); type = ptp_classify_raw(skb); __skb_pull(skb, ETH_HLEN); if (type == PTP_CLASS_NONE) return false; if (likely(ds->ops->port_rxtstamp)) return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type); return false; } static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *unused) { struct dsa_port *cpu_dp = dev->dsa_ptr; struct sk_buff *nskb = NULL; struct pcpu_sw_netstats *s; struct dsa_slave_priv *p; if (unlikely(!cpu_dp)) { kfree_skb(skb); return 0; } skb = skb_unshare(skb, GFP_ATOMIC); if (!skb) return 0; nskb = cpu_dp->rcv(skb, dev, pt); if (!nskb) { kfree_skb(skb); return 0; } skb = nskb; p = netdev_priv(skb->dev); skb_push(skb, ETH_HLEN); skb->pkt_type = PACKET_HOST; skb->protocol = eth_type_trans(skb, skb->dev); s = this_cpu_ptr(p->stats64); u64_stats_update_begin(&s->syncp); s->rx_packets++; s->rx_bytes += skb->len; u64_stats_update_end(&s->syncp); if (dsa_skb_defer_rx_timestamp(p, skb)) return 0; netif_receive_skb(skb); return 0; } #ifdef CONFIG_PM_SLEEP static bool dsa_is_port_initialized(struct dsa_switch *ds, int p) { return dsa_is_user_port(ds, p) && ds->ports[p].slave; } int dsa_switch_suspend(struct dsa_switch *ds) { int i, ret = 0; /* Suspend slave network devices */ for (i = 0; i < ds->num_ports; i++) { if (!dsa_is_port_initialized(ds, i)) continue; ret = dsa_slave_suspend(ds->ports[i].slave); if (ret) return ret; } if (ds->ops->suspend) ret = ds->ops->suspend(ds); return ret; } EXPORT_SYMBOL_GPL(dsa_switch_suspend); int dsa_switch_resume(struct dsa_switch *ds) { int i, ret = 0; if (ds->ops->resume) ret = ds->ops->resume(ds); if (ret) return ret; /* Resume slave network devices */ for (i = 0; i < ds->num_ports; i++) { if (!dsa_is_port_initialized(ds, i)) continue; ret = dsa_slave_resume(ds->ports[i].slave); if (ret) return ret; } return 0; } EXPORT_SYMBOL_GPL(dsa_switch_resume); #endif static struct packet_type dsa_pack_type __read_mostly = { .type = cpu_to_be16(ETH_P_XDSA), .func = dsa_switch_rcv, }; static struct workqueue_struct *dsa_owq; bool dsa_schedule_work(struct work_struct *work) { return queue_work(dsa_owq, work); } static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain); int register_dsa_notifier(struct notifier_block *nb) { return atomic_notifier_chain_register(&dsa_notif_chain, nb); } EXPORT_SYMBOL_GPL(register_dsa_notifier); int unregister_dsa_notifier(struct notifier_block *nb) { return atomic_notifier_chain_unregister(&dsa_notif_chain, nb); } EXPORT_SYMBOL_GPL(unregister_dsa_notifier); int call_dsa_notifiers(unsigned long val, struct net_device *dev, struct dsa_notifier_info *info) { info->dev = dev; return atomic_notifier_call_chain(&dsa_notif_chain, val, info); } EXPORT_SYMBOL_GPL(call_dsa_notifiers); static int __init dsa_init_module(void) { int rc; dsa_owq = alloc_ordered_workqueue("dsa_ordered", WQ_MEM_RECLAIM); if (!dsa_owq) return -ENOMEM; rc = dsa_slave_register_notifier(); if (rc) return rc; rc = dsa_legacy_register(); if (rc) return rc; dev_add_pack(&dsa_pack_type); return 0; } module_init(dsa_init_module); static void __exit dsa_cleanup_module(void) { dsa_slave_unregister_notifier(); dev_remove_pack(&dsa_pack_type); dsa_legacy_unregister(); destroy_workqueue(dsa_owq); } module_exit(dsa_cleanup_module); MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:dsa");