510 lines
12 KiB
C
510 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/dsa/dsa.c - Hardware switch handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
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*/
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#include <linux/of_net.h>
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#include <linux/netdevice.h>
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#include <linux/sysfs.h>
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#include <linux/phy_fixed.h>
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#include <linux/ptp_classify.h>
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#include <linux/etherdevice.h>
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#include "dsa_priv.h"
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static LIST_HEAD(dsa_tag_drivers_list);
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static DEFINE_MUTEX(dsa_tag_drivers_lock);
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static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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/* Just return the original SKB */
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return skb;
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}
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static const struct dsa_device_ops none_ops = {
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.name = "none",
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.proto = DSA_TAG_PROTO_NONE,
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.xmit = dsa_slave_notag_xmit,
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.rcv = NULL,
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};
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DSA_TAG_DRIVER(none_ops);
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static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
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struct module *owner)
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{
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dsa_tag_driver->owner = owner;
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mutex_lock(&dsa_tag_drivers_lock);
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list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
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mutex_unlock(&dsa_tag_drivers_lock);
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}
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void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
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unsigned int count, struct module *owner)
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{
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unsigned int i;
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for (i = 0; i < count; i++)
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dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
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}
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static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
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{
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mutex_lock(&dsa_tag_drivers_lock);
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list_del(&dsa_tag_driver->list);
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mutex_unlock(&dsa_tag_drivers_lock);
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}
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EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);
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void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
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unsigned int count)
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{
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unsigned int i;
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for (i = 0; i < count; i++)
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dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
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}
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EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);
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const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
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{
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return ops->name;
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};
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/* Function takes a reference on the module owning the tagger,
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* so dsa_tag_driver_put must be called afterwards.
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*/
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const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf)
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{
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const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
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struct dsa_tag_driver *dsa_tag_driver;
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mutex_lock(&dsa_tag_drivers_lock);
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list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
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const struct dsa_device_ops *tmp = dsa_tag_driver->ops;
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if (!sysfs_streq(buf, tmp->name))
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continue;
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if (!try_module_get(dsa_tag_driver->owner))
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break;
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ops = tmp;
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break;
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}
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mutex_unlock(&dsa_tag_drivers_lock);
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return ops;
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}
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const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
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{
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struct dsa_tag_driver *dsa_tag_driver;
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const struct dsa_device_ops *ops;
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bool found = false;
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request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);
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mutex_lock(&dsa_tag_drivers_lock);
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list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
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ops = dsa_tag_driver->ops;
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if (ops->proto == tag_protocol) {
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found = true;
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break;
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}
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}
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if (found) {
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if (!try_module_get(dsa_tag_driver->owner))
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ops = ERR_PTR(-ENOPROTOOPT);
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} else {
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ops = ERR_PTR(-ENOPROTOOPT);
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}
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mutex_unlock(&dsa_tag_drivers_lock);
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return ops;
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}
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void dsa_tag_driver_put(const struct dsa_device_ops *ops)
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{
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struct dsa_tag_driver *dsa_tag_driver;
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mutex_lock(&dsa_tag_drivers_lock);
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list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
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if (dsa_tag_driver->ops == ops) {
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module_put(dsa_tag_driver->owner);
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break;
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}
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}
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mutex_unlock(&dsa_tag_drivers_lock);
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}
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static int dev_is_class(struct device *dev, void *class)
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{
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if (dev->class != NULL && !strcmp(dev->class->name, class))
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return 1;
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return 0;
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}
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static struct device *dev_find_class(struct device *parent, char *class)
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{
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if (dev_is_class(parent, class)) {
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get_device(parent);
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return parent;
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}
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return device_find_child(parent, class, dev_is_class);
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}
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struct net_device *dsa_dev_to_net_device(struct device *dev)
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{
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struct device *d;
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d = dev_find_class(dev, "net");
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if (d != NULL) {
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struct net_device *nd;
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nd = to_net_dev(d);
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dev_hold(nd);
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put_device(d);
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return nd;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
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/* Determine if we should defer delivery of skb until we have a rx timestamp.
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*
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* Called from dsa_switch_rcv. For now, this will only work if tagging is
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* enabled on the switch. Normally the MAC driver would retrieve the hardware
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* timestamp when it reads the packet out of the hardware. However in a DSA
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* switch, the DSA driver owning the interface to which the packet is
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* delivered is never notified unless we do so here.
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*/
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static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
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struct sk_buff *skb)
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{
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struct dsa_switch *ds = p->dp->ds;
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unsigned int type;
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if (skb_headroom(skb) < ETH_HLEN)
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return false;
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__skb_push(skb, ETH_HLEN);
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type = ptp_classify_raw(skb);
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__skb_pull(skb, ETH_HLEN);
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if (type == PTP_CLASS_NONE)
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return false;
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if (likely(ds->ops->port_rxtstamp))
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return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
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return false;
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}
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static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *unused)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct sk_buff *nskb = NULL;
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struct dsa_slave_priv *p;
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if (unlikely(!cpu_dp)) {
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kfree_skb(skb);
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return 0;
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}
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (!skb)
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return 0;
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nskb = cpu_dp->rcv(skb, dev);
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if (!nskb) {
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kfree_skb(skb);
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return 0;
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}
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skb = nskb;
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skb_push(skb, ETH_HLEN);
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skb->pkt_type = PACKET_HOST;
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skb->protocol = eth_type_trans(skb, skb->dev);
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if (unlikely(!dsa_slave_dev_check(skb->dev))) {
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/* Packet is to be injected directly on an upper
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* device, e.g. a team/bond, so skip all DSA-port
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* specific actions.
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*/
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netif_rx(skb);
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return 0;
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}
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p = netdev_priv(skb->dev);
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if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
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nskb = dsa_untag_bridge_pvid(skb);
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if (!nskb) {
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kfree_skb(skb);
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return 0;
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}
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skb = nskb;
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}
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dev_sw_netstats_rx_add(skb->dev, skb->len);
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if (dsa_skb_defer_rx_timestamp(p, skb))
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return 0;
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gro_cells_receive(&p->gcells, skb);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static bool dsa_port_is_initialized(const struct dsa_port *dp)
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{
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return dp->type == DSA_PORT_TYPE_USER && dp->slave;
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}
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int dsa_switch_suspend(struct dsa_switch *ds)
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{
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struct dsa_port *dp;
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int ret = 0;
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/* Suspend slave network devices */
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dsa_switch_for_each_port(dp, ds) {
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if (!dsa_port_is_initialized(dp))
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continue;
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ret = dsa_slave_suspend(dp->slave);
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if (ret)
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return ret;
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}
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if (ds->ops->suspend)
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ret = ds->ops->suspend(ds);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dsa_switch_suspend);
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int dsa_switch_resume(struct dsa_switch *ds)
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{
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struct dsa_port *dp;
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int ret = 0;
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if (ds->ops->resume)
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ret = ds->ops->resume(ds);
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if (ret)
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return ret;
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/* Resume slave network devices */
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dsa_switch_for_each_port(dp, ds) {
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if (!dsa_port_is_initialized(dp))
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continue;
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ret = dsa_slave_resume(dp->slave);
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if (ret)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(dsa_switch_resume);
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#endif
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static struct packet_type dsa_pack_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_XDSA),
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.func = dsa_switch_rcv,
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};
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static struct workqueue_struct *dsa_owq;
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bool dsa_schedule_work(struct work_struct *work)
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{
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return queue_work(dsa_owq, work);
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}
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void dsa_flush_workqueue(void)
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{
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flush_workqueue(dsa_owq);
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}
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int dsa_devlink_param_get(struct devlink *dl, u32 id,
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struct devlink_param_gset_ctx *ctx)
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{
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struct dsa_switch *ds = dsa_devlink_to_ds(dl);
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if (!ds->ops->devlink_param_get)
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return -EOPNOTSUPP;
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return ds->ops->devlink_param_get(ds, id, ctx);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_param_get);
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int dsa_devlink_param_set(struct devlink *dl, u32 id,
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struct devlink_param_gset_ctx *ctx)
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{
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struct dsa_switch *ds = dsa_devlink_to_ds(dl);
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if (!ds->ops->devlink_param_set)
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return -EOPNOTSUPP;
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return ds->ops->devlink_param_set(ds, id, ctx);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_param_set);
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int dsa_devlink_params_register(struct dsa_switch *ds,
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const struct devlink_param *params,
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size_t params_count)
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{
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return devlink_params_register(ds->devlink, params, params_count);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_params_register);
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void dsa_devlink_params_unregister(struct dsa_switch *ds,
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const struct devlink_param *params,
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size_t params_count)
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{
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devlink_params_unregister(ds->devlink, params, params_count);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);
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int dsa_devlink_resource_register(struct dsa_switch *ds,
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const char *resource_name,
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u64 resource_size,
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u64 resource_id,
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u64 parent_resource_id,
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const struct devlink_resource_size_params *size_params)
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{
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return devlink_resource_register(ds->devlink, resource_name,
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resource_size, resource_id,
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parent_resource_id,
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size_params);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);
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void dsa_devlink_resources_unregister(struct dsa_switch *ds)
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{
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devlink_resources_unregister(ds->devlink);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);
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void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
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u64 resource_id,
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devlink_resource_occ_get_t *occ_get,
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void *occ_get_priv)
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{
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return devlink_resource_occ_get_register(ds->devlink, resource_id,
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occ_get, occ_get_priv);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register);
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void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
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u64 resource_id)
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{
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devlink_resource_occ_get_unregister(ds->devlink, resource_id);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister);
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struct devlink_region *
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dsa_devlink_region_create(struct dsa_switch *ds,
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const struct devlink_region_ops *ops,
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u32 region_max_snapshots, u64 region_size)
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{
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return devlink_region_create(ds->devlink, ops, region_max_snapshots,
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region_size);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_region_create);
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struct devlink_region *
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dsa_devlink_port_region_create(struct dsa_switch *ds,
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int port,
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const struct devlink_port_region_ops *ops,
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u32 region_max_snapshots, u64 region_size)
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{
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struct dsa_port *dp = dsa_to_port(ds, port);
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return devlink_port_region_create(&dp->devlink_port, ops,
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region_max_snapshots,
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region_size);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create);
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void dsa_devlink_region_destroy(struct devlink_region *region)
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{
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devlink_region_destroy(region);
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}
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EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy);
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struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
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{
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if (!netdev || !dsa_slave_dev_check(netdev))
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return ERR_PTR(-ENODEV);
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return dsa_slave_to_port(netdev);
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}
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EXPORT_SYMBOL_GPL(dsa_port_from_netdev);
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static int __init dsa_init_module(void)
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{
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int rc;
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dsa_owq = alloc_ordered_workqueue("dsa_ordered",
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WQ_MEM_RECLAIM);
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if (!dsa_owq)
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return -ENOMEM;
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rc = dsa_slave_register_notifier();
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if (rc)
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goto register_notifier_fail;
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dev_add_pack(&dsa_pack_type);
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dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
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THIS_MODULE);
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return 0;
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register_notifier_fail:
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destroy_workqueue(dsa_owq);
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return rc;
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}
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module_init(dsa_init_module);
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static void __exit dsa_cleanup_module(void)
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{
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dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));
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dsa_slave_unregister_notifier();
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dev_remove_pack(&dsa_pack_type);
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destroy_workqueue(dsa_owq);
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}
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module_exit(dsa_cleanup_module);
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MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
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MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:dsa");
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