2 * net/dsa/dsa2.c - Hardware switch handling, binding version 2
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
5 * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/device.h>
14 #include <linux/err.h>
15 #include <linux/list.h>
16 #include <linux/netdevice.h>
17 #include <linux/slab.h>
18 #include <linux/rtnetlink.h>
20 #include <linux/of_net.h>
24 static LIST_HEAD(dsa_tree_list);
25 static DEFINE_MUTEX(dsa2_mutex);
27 static const struct devlink_ops dsa_devlink_ops = {
30 static struct dsa_switch_tree *dsa_tree_find(int index)
32 struct dsa_switch_tree *dst;
34 list_for_each_entry(dst, &dsa_tree_list, list)
35 if (dst->index == index)
41 static struct dsa_switch_tree *dsa_tree_alloc(int index)
43 struct dsa_switch_tree *dst;
45 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
51 INIT_LIST_HEAD(&dst->list);
52 list_add_tail(&dst->list, &dsa_tree_list);
54 kref_init(&dst->refcount);
59 static void dsa_tree_free(struct dsa_switch_tree *dst)
65 static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst)
68 kref_get(&dst->refcount);
73 static struct dsa_switch_tree *dsa_tree_touch(int index)
75 struct dsa_switch_tree *dst;
77 dst = dsa_tree_find(index);
79 return dsa_tree_get(dst);
81 return dsa_tree_alloc(index);
84 static void dsa_tree_release(struct kref *ref)
86 struct dsa_switch_tree *dst;
88 dst = container_of(ref, struct dsa_switch_tree, refcount);
93 static void dsa_tree_put(struct dsa_switch_tree *dst)
96 kref_put(&dst->refcount, dsa_tree_release);
99 static bool dsa_port_is_dsa(struct dsa_port *port)
101 return port->type == DSA_PORT_TYPE_DSA;
104 static bool dsa_port_is_cpu(struct dsa_port *port)
106 return port->type == DSA_PORT_TYPE_CPU;
109 static bool dsa_port_is_user(struct dsa_port *dp)
111 return dp->type == DSA_PORT_TYPE_USER;
114 static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst,
115 struct device_node *dn)
117 struct dsa_switch *ds;
121 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
122 ds = dst->ds[device];
126 for (port = 0; port < ds->num_ports; port++) {
127 dp = &ds->ports[port];
137 static bool dsa_port_setup_routing_table(struct dsa_port *dp)
139 struct dsa_switch *ds = dp->ds;
140 struct dsa_switch_tree *dst = ds->dst;
141 struct device_node *dn = dp->dn;
142 struct of_phandle_iterator it;
143 struct dsa_port *link_dp;
146 of_for_each_phandle(&it, err, dn, "link", NULL, 0) {
147 link_dp = dsa_tree_find_port_by_node(dst, it.node);
149 of_node_put(it.node);
153 ds->rtable[link_dp->ds->index] = dp->index;
159 static bool dsa_switch_setup_routing_table(struct dsa_switch *ds)
161 bool complete = true;
165 for (i = 0; i < DSA_MAX_SWITCHES; i++)
166 ds->rtable[i] = DSA_RTABLE_NONE;
168 for (i = 0; i < ds->num_ports; i++) {
171 if (dsa_port_is_dsa(dp)) {
172 complete = dsa_port_setup_routing_table(dp);
181 static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst)
183 struct dsa_switch *ds;
184 bool complete = true;
187 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
188 ds = dst->ds[device];
192 complete = dsa_switch_setup_routing_table(ds);
200 static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst)
202 struct dsa_switch *ds;
206 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
207 ds = dst->ds[device];
211 for (port = 0; port < ds->num_ports; port++) {
212 dp = &ds->ports[port];
214 if (dsa_port_is_cpu(dp))
222 static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst)
224 struct dsa_switch *ds;
228 /* DSA currently only supports a single CPU port */
229 dst->cpu_dp = dsa_tree_find_first_cpu(dst);
231 pr_warn("Tree has no master device\n");
235 /* Assign the default CPU port to all ports of the fabric */
236 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
237 ds = dst->ds[device];
241 for (port = 0; port < ds->num_ports; port++) {
242 dp = &ds->ports[port];
244 if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp))
245 dp->cpu_dp = dst->cpu_dp;
252 static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
254 /* DSA currently only supports a single CPU port */
258 static int dsa_port_setup(struct dsa_port *dp)
260 struct dsa_switch *ds = dp->ds;
263 memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));
264 dp->mac = of_get_mac_address(dp->dn);
266 if (dp->type != DSA_PORT_TYPE_UNUSED)
267 err = devlink_port_register(ds->devlink, &dp->devlink_port,
273 case DSA_PORT_TYPE_UNUSED:
275 case DSA_PORT_TYPE_CPU:
276 /* dp->index is used now as port_number. However
277 * CPU ports should have separate numbering
278 * independent from front panel port numbers.
280 devlink_port_attrs_set(&dp->devlink_port,
281 DEVLINK_PORT_FLAVOUR_CPU,
282 dp->index, false, 0);
283 err = dsa_port_link_register_of(dp);
285 dev_err(ds->dev, "failed to setup link for port %d.%d\n",
286 ds->index, dp->index);
290 case DSA_PORT_TYPE_DSA:
291 /* dp->index is used now as port_number. However
292 * DSA ports should have separate numbering
293 * independent from front panel port numbers.
295 devlink_port_attrs_set(&dp->devlink_port,
296 DEVLINK_PORT_FLAVOUR_DSA,
297 dp->index, false, 0);
298 err = dsa_port_link_register_of(dp);
300 dev_err(ds->dev, "failed to setup link for port %d.%d\n",
301 ds->index, dp->index);
305 case DSA_PORT_TYPE_USER:
306 devlink_port_attrs_set(&dp->devlink_port,
307 DEVLINK_PORT_FLAVOUR_PHYSICAL,
308 dp->index, false, 0);
309 err = dsa_slave_create(dp);
311 dev_err(ds->dev, "failed to create slave for port %d.%d\n",
312 ds->index, dp->index);
314 devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
321 static void dsa_port_teardown(struct dsa_port *dp)
323 if (dp->type != DSA_PORT_TYPE_UNUSED)
324 devlink_port_unregister(&dp->devlink_port);
327 case DSA_PORT_TYPE_UNUSED:
329 case DSA_PORT_TYPE_CPU:
330 case DSA_PORT_TYPE_DSA:
331 dsa_port_link_unregister_of(dp);
333 case DSA_PORT_TYPE_USER:
335 dsa_slave_destroy(dp->slave);
342 static int dsa_switch_setup(struct dsa_switch *ds)
346 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
347 * driver and before ops->setup() has run, since the switch drivers and
348 * the slave MDIO bus driver rely on these values for probing PHY
351 ds->phys_mii_mask |= dsa_user_ports(ds);
353 /* Add the switch to devlink before calling setup, so that setup can
356 ds->devlink = devlink_alloc(&dsa_devlink_ops, 0);
360 err = devlink_register(ds->devlink, ds->dev);
364 err = ds->ops->setup(ds);
368 err = dsa_switch_register_notifier(ds);
372 if (!ds->slave_mii_bus && ds->ops->phy_read) {
373 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
374 if (!ds->slave_mii_bus)
377 dsa_slave_mii_bus_init(ds);
379 err = mdiobus_register(ds->slave_mii_bus);
387 static void dsa_switch_teardown(struct dsa_switch *ds)
389 if (ds->slave_mii_bus && ds->ops->phy_read)
390 mdiobus_unregister(ds->slave_mii_bus);
392 dsa_switch_unregister_notifier(ds);
395 devlink_unregister(ds->devlink);
396 devlink_free(ds->devlink);
402 static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
404 struct dsa_switch *ds;
409 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
410 ds = dst->ds[device];
414 err = dsa_switch_setup(ds);
418 for (port = 0; port < ds->num_ports; port++) {
419 dp = &ds->ports[port];
421 err = dsa_port_setup(dp);
430 static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
432 struct dsa_switch *ds;
436 for (device = 0; device < DSA_MAX_SWITCHES; device++) {
437 ds = dst->ds[device];
441 for (port = 0; port < ds->num_ports; port++) {
442 dp = &ds->ports[port];
444 dsa_port_teardown(dp);
447 dsa_switch_teardown(ds);
451 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
453 struct dsa_port *cpu_dp = dst->cpu_dp;
454 struct net_device *master = cpu_dp->master;
456 /* DSA currently supports a single pair of CPU port and master device */
457 return dsa_master_setup(master, cpu_dp);
460 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
462 struct dsa_port *cpu_dp = dst->cpu_dp;
463 struct net_device *master = cpu_dp->master;
465 return dsa_master_teardown(master);
468 static int dsa_tree_setup(struct dsa_switch_tree *dst)
474 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
479 complete = dsa_tree_setup_routing_table(dst);
483 err = dsa_tree_setup_default_cpu(dst);
487 err = dsa_tree_setup_switches(dst);
491 err = dsa_tree_setup_master(dst);
497 pr_info("DSA: tree %d setup\n", dst->index);
502 static void dsa_tree_teardown(struct dsa_switch_tree *dst)
507 dsa_tree_teardown_master(dst);
509 dsa_tree_teardown_switches(dst);
511 dsa_tree_teardown_default_cpu(dst);
513 pr_info("DSA: tree %d torn down\n", dst->index);
518 static void dsa_tree_remove_switch(struct dsa_switch_tree *dst,
521 dsa_tree_teardown(dst);
523 dst->ds[index] = NULL;
527 static int dsa_tree_add_switch(struct dsa_switch_tree *dst,
528 struct dsa_switch *ds)
530 unsigned int index = ds->index;
539 err = dsa_tree_setup(dst);
541 dsa_tree_remove_switch(dst, index);
546 static int dsa_port_parse_user(struct dsa_port *dp, const char *name)
551 dp->type = DSA_PORT_TYPE_USER;
557 static int dsa_port_parse_dsa(struct dsa_port *dp)
559 dp->type = DSA_PORT_TYPE_DSA;
564 static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
566 struct dsa_switch *ds = dp->ds;
567 struct dsa_switch_tree *dst = ds->dst;
568 const struct dsa_device_ops *tag_ops;
569 enum dsa_tag_protocol tag_protocol;
571 tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
572 tag_ops = dsa_resolve_tag_protocol(tag_protocol);
573 if (IS_ERR(tag_ops)) {
574 dev_warn(ds->dev, "No tagger for this switch\n");
575 return PTR_ERR(tag_ops);
578 dp->type = DSA_PORT_TYPE_CPU;
579 dp->rcv = tag_ops->rcv;
580 dp->tag_ops = tag_ops;
587 static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
589 struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0);
590 const char *name = of_get_property(dn, "label", NULL);
591 bool link = of_property_read_bool(dn, "link");
596 struct net_device *master;
598 master = of_find_net_device_by_node(ethernet);
599 of_node_put(ethernet);
601 return -EPROBE_DEFER;
603 return dsa_port_parse_cpu(dp, master);
607 return dsa_port_parse_dsa(dp);
609 return dsa_port_parse_user(dp, name);
612 static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
613 struct device_node *dn)
615 struct device_node *ports, *port;
620 ports = of_get_child_by_name(dn, "ports");
622 dev_err(ds->dev, "no ports child node found\n");
626 for_each_available_child_of_node(ports, port) {
627 err = of_property_read_u32(port, "reg", ®);
631 if (reg >= ds->num_ports)
634 dp = &ds->ports[reg];
636 err = dsa_port_parse_of(dp, port);
644 static int dsa_switch_parse_member_of(struct dsa_switch *ds,
645 struct device_node *dn)
650 /* Don't error out if this optional property isn't found */
651 sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
652 if (sz < 0 && sz != -EINVAL)
656 if (ds->index >= DSA_MAX_SWITCHES)
659 ds->dst = dsa_tree_touch(m[0]);
666 static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
670 err = dsa_switch_parse_member_of(ds, dn);
674 return dsa_switch_parse_ports_of(ds, dn);
677 static int dsa_port_parse(struct dsa_port *dp, const char *name,
680 if (!strcmp(name, "cpu")) {
681 struct net_device *master;
683 master = dsa_dev_to_net_device(dev);
685 return -EPROBE_DEFER;
689 return dsa_port_parse_cpu(dp, master);
692 if (!strcmp(name, "dsa"))
693 return dsa_port_parse_dsa(dp);
695 return dsa_port_parse_user(dp, name);
698 static int dsa_switch_parse_ports(struct dsa_switch *ds,
699 struct dsa_chip_data *cd)
701 bool valid_name_found = false;
708 for (i = 0; i < DSA_MAX_PORTS; i++) {
709 name = cd->port_names[i];
716 err = dsa_port_parse(dp, name, dev);
720 valid_name_found = true;
723 if (!valid_name_found && i == DSA_MAX_PORTS)
729 static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
733 /* We don't support interconnected switches nor multiple trees via
734 * platform data, so this is the unique switch of the tree.
737 ds->dst = dsa_tree_touch(0);
741 return dsa_switch_parse_ports(ds, cd);
744 static int dsa_switch_add(struct dsa_switch *ds)
746 struct dsa_switch_tree *dst = ds->dst;
748 return dsa_tree_add_switch(dst, ds);
751 static int dsa_switch_probe(struct dsa_switch *ds)
753 struct dsa_chip_data *pdata = ds->dev->platform_data;
754 struct device_node *np = ds->dev->of_node;
758 err = dsa_switch_parse_of(ds, np);
760 err = dsa_switch_parse(ds, pdata);
767 return dsa_switch_add(ds);
770 struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
772 size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
773 struct dsa_switch *ds;
776 ds = devm_kzalloc(dev, size, GFP_KERNEL);
780 /* We avoid allocating memory outside dsa_switch
781 * if it is not needed.
783 if (n <= sizeof(ds->_bitmap) * 8) {
784 ds->bitmap = &ds->_bitmap;
786 ds->bitmap = devm_kcalloc(dev,
788 sizeof(unsigned long),
790 if (unlikely(!ds->bitmap))
797 for (i = 0; i < ds->num_ports; ++i) {
798 ds->ports[i].index = i;
799 ds->ports[i].ds = ds;
804 EXPORT_SYMBOL_GPL(dsa_switch_alloc);
806 int dsa_register_switch(struct dsa_switch *ds)
810 mutex_lock(&dsa2_mutex);
811 err = dsa_switch_probe(ds);
812 dsa_tree_put(ds->dst);
813 mutex_unlock(&dsa2_mutex);
817 EXPORT_SYMBOL_GPL(dsa_register_switch);
819 static void dsa_switch_remove(struct dsa_switch *ds)
821 struct dsa_switch_tree *dst = ds->dst;
822 unsigned int index = ds->index;
824 dsa_tree_remove_switch(dst, index);
827 void dsa_unregister_switch(struct dsa_switch *ds)
829 mutex_lock(&dsa2_mutex);
830 dsa_switch_remove(ds);
831 mutex_unlock(&dsa2_mutex);
833 EXPORT_SYMBOL_GPL(dsa_unregister_switch);