// SPDX-License-Identifier: GPL-2.0-or-later /* * net/dsa/dsa.c - Hardware switch handling * Copyright (c) 2008-2009 Marvell Semiconductor * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> */ #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/netdevice.h> #include <linux/sysfs.h> #include <linux/phy_fixed.h> #include <linux/ptp_classify.h> #include <linux/etherdevice.h> #include "dsa_priv.h" static LIST_HEAD(dsa_tag_drivers_list); static DEFINE_MUTEX(dsa_tag_drivers_lock); 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 = { .name = "none", .proto = DSA_TAG_PROTO_NONE, .xmit = dsa_slave_notag_xmit, .rcv = NULL, }; DSA_TAG_DRIVER(none_ops); static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver, struct module *owner) { dsa_tag_driver->owner = owner; mutex_lock(&dsa_tag_drivers_lock); list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list); mutex_unlock(&dsa_tag_drivers_lock); } void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[], unsigned int count, struct module *owner) { unsigned int i; for (i = 0; i < count; i++) dsa_tag_driver_register(dsa_tag_driver_array[i], owner); } static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver) { mutex_lock(&dsa_tag_drivers_lock); list_del(&dsa_tag_driver->list); mutex_unlock(&dsa_tag_drivers_lock); } EXPORT_SYMBOL_GPL(dsa_tag_drivers_register); void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[], unsigned int count) { unsigned int i; for (i = 0; i < count; i++) dsa_tag_driver_unregister(dsa_tag_driver_array[i]); } EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister); const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops) { return ops->name; }; /* Function takes a reference on the module owning the tagger, * so dsa_tag_driver_put must be called afterwards. */ const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf) { const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT); struct dsa_tag_driver *dsa_tag_driver; mutex_lock(&dsa_tag_drivers_lock); list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) { const struct dsa_device_ops *tmp = dsa_tag_driver->ops; if (!sysfs_streq(buf, tmp->name)) continue; if (!try_module_get(dsa_tag_driver->owner)) break; ops = tmp; break; } mutex_unlock(&dsa_tag_drivers_lock); return ops; } const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol) { struct dsa_tag_driver *dsa_tag_driver; const struct dsa_device_ops *ops; bool found = false; request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol); mutex_lock(&dsa_tag_drivers_lock); list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) { ops = dsa_tag_driver->ops; if (ops->proto == tag_protocol) { found = true; break; } } if (found) { if (!try_module_get(dsa_tag_driver->owner)) ops = ERR_PTR(-ENOPROTOOPT); } else { ops = ERR_PTR(-ENOPROTOOPT); } mutex_unlock(&dsa_tag_drivers_lock); return ops; } void dsa_tag_driver_put(const struct dsa_device_ops *ops) { struct dsa_tag_driver *dsa_tag_driver; mutex_lock(&dsa_tag_drivers_lock); list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) { if (dsa_tag_driver->ops == ops) { module_put(dsa_tag_driver->owner); break; } } mutex_unlock(&dsa_tag_drivers_lock); } 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 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); if (!nskb) { kfree_skb(skb); return 0; } skb = nskb; skb_push(skb, ETH_HLEN); skb->pkt_type = PACKET_HOST; skb->protocol = eth_type_trans(skb, skb->dev); if (unlikely(!dsa_slave_dev_check(skb->dev))) { /* Packet is to be injected directly on an upper * device, e.g. a team/bond, so skip all DSA-port * specific actions. */ netif_rx(skb); return 0; } p = netdev_priv(skb->dev); if (unlikely(cpu_dp->ds->untag_bridge_pvid)) { nskb = dsa_untag_bridge_pvid(skb); if (!nskb) { kfree_skb(skb); return 0; } skb = nskb; } dev_sw_netstats_rx_add(skb->dev, skb->len); if (dsa_skb_defer_rx_timestamp(p, skb)) return 0; gro_cells_receive(&p->gcells, skb); return 0; } #ifdef CONFIG_PM_SLEEP static bool dsa_port_is_initialized(const struct dsa_port *dp) { return dp->type == DSA_PORT_TYPE_USER && dp->slave; } int dsa_switch_suspend(struct dsa_switch *ds) { struct dsa_port *dp; int ret = 0; /* Suspend slave network devices */ dsa_switch_for_each_port(dp, ds) { if (!dsa_port_is_initialized(dp)) continue; ret = dsa_slave_suspend(dp->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) { struct dsa_port *dp; int ret = 0; if (ds->ops->resume) ret = ds->ops->resume(ds); if (ret) return ret; /* Resume slave network devices */ dsa_switch_for_each_port(dp, ds) { if (!dsa_port_is_initialized(dp)) continue; ret = dsa_slave_resume(dp->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); } void dsa_flush_workqueue(void) { flush_workqueue(dsa_owq); } int dsa_devlink_param_get(struct devlink *dl, u32 id, struct devlink_param_gset_ctx *ctx) { struct dsa_switch *ds = dsa_devlink_to_ds(dl); if (!ds->ops->devlink_param_get) return -EOPNOTSUPP; return ds->ops->devlink_param_get(ds, id, ctx); } EXPORT_SYMBOL_GPL(dsa_devlink_param_get); int dsa_devlink_param_set(struct devlink *dl, u32 id, struct devlink_param_gset_ctx *ctx) { struct dsa_switch *ds = dsa_devlink_to_ds(dl); if (!ds->ops->devlink_param_set) return -EOPNOTSUPP; return ds->ops->devlink_param_set(ds, id, ctx); } EXPORT_SYMBOL_GPL(dsa_devlink_param_set); int dsa_devlink_params_register(struct dsa_switch *ds, const struct devlink_param *params, size_t params_count) { return devlink_params_register(ds->devlink, params, params_count); } EXPORT_SYMBOL_GPL(dsa_devlink_params_register); void dsa_devlink_params_unregister(struct dsa_switch *ds, const struct devlink_param *params, size_t params_count) { devlink_params_unregister(ds->devlink, params, params_count); } EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister); int dsa_devlink_resource_register(struct dsa_switch *ds, const char *resource_name, u64 resource_size, u64 resource_id, u64 parent_resource_id, const struct devlink_resource_size_params *size_params) { return devlink_resource_register(ds->devlink, resource_name, resource_size, resource_id, parent_resource_id, size_params); } EXPORT_SYMBOL_GPL(dsa_devlink_resource_register); void dsa_devlink_resources_unregister(struct dsa_switch *ds) { devlink_resources_unregister(ds->devlink, NULL); } EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister); void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds, u64 resource_id, devlink_resource_occ_get_t *occ_get, void *occ_get_priv) { return devlink_resource_occ_get_register(ds->devlink, resource_id, occ_get, occ_get_priv); } EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register); void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds, u64 resource_id) { devlink_resource_occ_get_unregister(ds->devlink, resource_id); } EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister); struct devlink_region * dsa_devlink_region_create(struct dsa_switch *ds, const struct devlink_region_ops *ops, u32 region_max_snapshots, u64 region_size) { return devlink_region_create(ds->devlink, ops, region_max_snapshots, region_size); } EXPORT_SYMBOL_GPL(dsa_devlink_region_create); struct devlink_region * dsa_devlink_port_region_create(struct dsa_switch *ds, int port, const struct devlink_port_region_ops *ops, u32 region_max_snapshots, u64 region_size) { struct dsa_port *dp = dsa_to_port(ds, port); return devlink_port_region_create(&dp->devlink_port, ops, region_max_snapshots, region_size); } EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create); void dsa_devlink_region_destroy(struct devlink_region *region) { devlink_region_destroy(region); } EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy); struct dsa_port *dsa_port_from_netdev(struct net_device *netdev) { if (!netdev || !dsa_slave_dev_check(netdev)) return ERR_PTR(-ENODEV); return dsa_slave_to_port(netdev); } EXPORT_SYMBOL_GPL(dsa_port_from_netdev); 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) goto register_notifier_fail; dev_add_pack(&dsa_pack_type); dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops), THIS_MODULE); return 0; register_notifier_fail: destroy_workqueue(dsa_owq); return rc; } module_init(dsa_init_module); static void __exit dsa_cleanup_module(void) { dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops)); dsa_slave_unregister_notifier(); dev_remove_pack(&dsa_pack_type); 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");