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504 lines
12 KiB
504 lines
12 KiB
// 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 <[email protected]> |
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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, pt); |
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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_is_port_initialized(struct dsa_switch *ds, int p) |
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{ |
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const struct dsa_port *dp = dsa_to_port(ds, p); |
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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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int i, ret = 0; |
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/* Suspend slave network devices */ |
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for (i = 0; i < ds->num_ports; i++) { |
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if (!dsa_is_port_initialized(ds, i)) |
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continue; |
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ret = dsa_slave_suspend(dsa_to_port(ds, i)->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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int i, 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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for (i = 0; i < ds->num_ports; i++) { |
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if (!dsa_is_port_initialized(ds, i)) |
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continue; |
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ret = dsa_slave_resume(dsa_to_port(ds, i)->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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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, NULL); |
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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 <[email protected]>"); |
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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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