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(&dsa_tree_list
, &dst
->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
))
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
));
265 if (dp
->type
!= DSA_PORT_TYPE_UNUSED
)
266 err
= devlink_port_register(ds
->devlink
, &dp
->devlink_port
,
272 case DSA_PORT_TYPE_UNUSED
:
274 case DSA_PORT_TYPE_CPU
:
275 case DSA_PORT_TYPE_DSA
:
276 err
= dsa_port_fixed_link_register_of(dp
);
278 dev_err(ds
->dev
, "failed to register fixed link for port %d.%d\n",
279 ds
->index
, dp
->index
);
284 case DSA_PORT_TYPE_USER
:
285 err
= dsa_slave_create(dp
);
287 dev_err(ds
->dev
, "failed to create slave for port %d.%d\n",
288 ds
->index
, dp
->index
);
290 devlink_port_type_eth_set(&dp
->devlink_port
, dp
->slave
);
297 static void dsa_port_teardown(struct dsa_port
*dp
)
299 if (dp
->type
!= DSA_PORT_TYPE_UNUSED
)
300 devlink_port_unregister(&dp
->devlink_port
);
303 case DSA_PORT_TYPE_UNUSED
:
305 case DSA_PORT_TYPE_CPU
:
306 case DSA_PORT_TYPE_DSA
:
307 dsa_port_fixed_link_unregister_of(dp
);
309 case DSA_PORT_TYPE_USER
:
311 dsa_slave_destroy(dp
->slave
);
318 static int dsa_switch_setup(struct dsa_switch
*ds
)
322 /* Initialize ds->phys_mii_mask before registering the slave MDIO bus
323 * driver and before ops->setup() has run, since the switch drivers and
324 * the slave MDIO bus driver rely on these values for probing PHY
327 ds
->phys_mii_mask
|= dsa_user_ports(ds
);
329 /* Add the switch to devlink before calling setup, so that setup can
332 ds
->devlink
= devlink_alloc(&dsa_devlink_ops
, 0);
336 err
= devlink_register(ds
->devlink
, ds
->dev
);
340 err
= ds
->ops
->setup(ds
);
344 err
= dsa_switch_register_notifier(ds
);
348 if (!ds
->slave_mii_bus
&& ds
->ops
->phy_read
) {
349 ds
->slave_mii_bus
= devm_mdiobus_alloc(ds
->dev
);
350 if (!ds
->slave_mii_bus
)
353 dsa_slave_mii_bus_init(ds
);
355 err
= mdiobus_register(ds
->slave_mii_bus
);
363 static void dsa_switch_teardown(struct dsa_switch
*ds
)
365 if (ds
->slave_mii_bus
&& ds
->ops
->phy_read
)
366 mdiobus_unregister(ds
->slave_mii_bus
);
368 dsa_switch_unregister_notifier(ds
);
371 devlink_unregister(ds
->devlink
);
372 devlink_free(ds
->devlink
);
378 static int dsa_tree_setup_switches(struct dsa_switch_tree
*dst
)
380 struct dsa_switch
*ds
;
385 for (device
= 0; device
< DSA_MAX_SWITCHES
; device
++) {
386 ds
= dst
->ds
[device
];
390 err
= dsa_switch_setup(ds
);
394 for (port
= 0; port
< ds
->num_ports
; port
++) {
395 dp
= &ds
->ports
[port
];
397 err
= dsa_port_setup(dp
);
406 static void dsa_tree_teardown_switches(struct dsa_switch_tree
*dst
)
408 struct dsa_switch
*ds
;
412 for (device
= 0; device
< DSA_MAX_SWITCHES
; device
++) {
413 ds
= dst
->ds
[device
];
417 for (port
= 0; port
< ds
->num_ports
; port
++) {
418 dp
= &ds
->ports
[port
];
420 dsa_port_teardown(dp
);
423 dsa_switch_teardown(ds
);
427 static int dsa_tree_setup_master(struct dsa_switch_tree
*dst
)
429 struct dsa_port
*cpu_dp
= dst
->cpu_dp
;
430 struct net_device
*master
= cpu_dp
->master
;
432 /* DSA currently supports a single pair of CPU port and master device */
433 return dsa_master_setup(master
, cpu_dp
);
436 static void dsa_tree_teardown_master(struct dsa_switch_tree
*dst
)
438 struct dsa_port
*cpu_dp
= dst
->cpu_dp
;
439 struct net_device
*master
= cpu_dp
->master
;
441 return dsa_master_teardown(master
);
444 static int dsa_tree_setup(struct dsa_switch_tree
*dst
)
450 pr_err("DSA: tree %d already setup! Disjoint trees?\n",
455 complete
= dsa_tree_setup_routing_table(dst
);
459 err
= dsa_tree_setup_default_cpu(dst
);
463 err
= dsa_tree_setup_switches(dst
);
467 err
= dsa_tree_setup_master(dst
);
473 pr_info("DSA: tree %d setup\n", dst
->index
);
478 static void dsa_tree_teardown(struct dsa_switch_tree
*dst
)
483 dsa_tree_teardown_master(dst
);
485 dsa_tree_teardown_switches(dst
);
487 dsa_tree_teardown_default_cpu(dst
);
489 pr_info("DSA: tree %d torn down\n", dst
->index
);
494 static void dsa_tree_remove_switch(struct dsa_switch_tree
*dst
,
497 dsa_tree_teardown(dst
);
499 dst
->ds
[index
] = NULL
;
503 static int dsa_tree_add_switch(struct dsa_switch_tree
*dst
,
504 struct dsa_switch
*ds
)
506 unsigned int index
= ds
->index
;
515 err
= dsa_tree_setup(dst
);
517 dsa_tree_remove_switch(dst
, index
);
522 static int dsa_port_parse_user(struct dsa_port
*dp
, const char *name
)
527 dp
->type
= DSA_PORT_TYPE_USER
;
533 static int dsa_port_parse_dsa(struct dsa_port
*dp
)
535 dp
->type
= DSA_PORT_TYPE_DSA
;
540 static int dsa_port_parse_cpu(struct dsa_port
*dp
, struct net_device
*master
)
542 struct dsa_switch
*ds
= dp
->ds
;
543 struct dsa_switch_tree
*dst
= ds
->dst
;
544 const struct dsa_device_ops
*tag_ops
;
545 enum dsa_tag_protocol tag_protocol
;
547 tag_protocol
= ds
->ops
->get_tag_protocol(ds
, dp
->index
);
548 tag_ops
= dsa_resolve_tag_protocol(tag_protocol
);
549 if (IS_ERR(tag_ops
)) {
550 dev_warn(ds
->dev
, "No tagger for this switch\n");
551 return PTR_ERR(tag_ops
);
554 dp
->type
= DSA_PORT_TYPE_CPU
;
555 dp
->rcv
= tag_ops
->rcv
;
556 dp
->tag_ops
= tag_ops
;
563 static int dsa_port_parse_of(struct dsa_port
*dp
, struct device_node
*dn
)
565 struct device_node
*ethernet
= of_parse_phandle(dn
, "ethernet", 0);
566 const char *name
= of_get_property(dn
, "label", NULL
);
567 bool link
= of_property_read_bool(dn
, "link");
572 struct net_device
*master
;
574 master
= of_find_net_device_by_node(ethernet
);
576 return -EPROBE_DEFER
;
578 return dsa_port_parse_cpu(dp
, master
);
582 return dsa_port_parse_dsa(dp
);
584 return dsa_port_parse_user(dp
, name
);
587 static int dsa_switch_parse_ports_of(struct dsa_switch
*ds
,
588 struct device_node
*dn
)
590 struct device_node
*ports
, *port
;
595 ports
= of_get_child_by_name(dn
, "ports");
597 dev_err(ds
->dev
, "no ports child node found\n");
601 for_each_available_child_of_node(ports
, port
) {
602 err
= of_property_read_u32(port
, "reg", ®
);
606 if (reg
>= ds
->num_ports
)
609 dp
= &ds
->ports
[reg
];
611 err
= dsa_port_parse_of(dp
, port
);
619 static int dsa_switch_parse_member_of(struct dsa_switch
*ds
,
620 struct device_node
*dn
)
625 /* Don't error out if this optional property isn't found */
626 sz
= of_property_read_variable_u32_array(dn
, "dsa,member", m
, 2, 2);
627 if (sz
< 0 && sz
!= -EINVAL
)
631 if (ds
->index
>= DSA_MAX_SWITCHES
)
634 ds
->dst
= dsa_tree_touch(m
[0]);
641 static int dsa_switch_parse_of(struct dsa_switch
*ds
, struct device_node
*dn
)
645 err
= dsa_switch_parse_member_of(ds
, dn
);
649 return dsa_switch_parse_ports_of(ds
, dn
);
652 static int dsa_port_parse(struct dsa_port
*dp
, const char *name
,
655 if (!strcmp(name
, "cpu")) {
656 struct net_device
*master
;
658 master
= dsa_dev_to_net_device(dev
);
660 return -EPROBE_DEFER
;
664 return dsa_port_parse_cpu(dp
, master
);
667 if (!strcmp(name
, "dsa"))
668 return dsa_port_parse_dsa(dp
);
670 return dsa_port_parse_user(dp
, name
);
673 static int dsa_switch_parse_ports(struct dsa_switch
*ds
,
674 struct dsa_chip_data
*cd
)
676 bool valid_name_found
= false;
683 for (i
= 0; i
< DSA_MAX_PORTS
; i
++) {
684 name
= cd
->port_names
[i
];
691 err
= dsa_port_parse(dp
, name
, dev
);
695 valid_name_found
= true;
698 if (!valid_name_found
&& i
== DSA_MAX_PORTS
)
704 static int dsa_switch_parse(struct dsa_switch
*ds
, struct dsa_chip_data
*cd
)
708 /* We don't support interconnected switches nor multiple trees via
709 * platform data, so this is the unique switch of the tree.
712 ds
->dst
= dsa_tree_touch(0);
716 return dsa_switch_parse_ports(ds
, cd
);
719 static int dsa_switch_add(struct dsa_switch
*ds
)
721 struct dsa_switch_tree
*dst
= ds
->dst
;
723 return dsa_tree_add_switch(dst
, ds
);
726 static int dsa_switch_probe(struct dsa_switch
*ds
)
728 struct dsa_chip_data
*pdata
= ds
->dev
->platform_data
;
729 struct device_node
*np
= ds
->dev
->of_node
;
733 err
= dsa_switch_parse_of(ds
, np
);
735 err
= dsa_switch_parse(ds
, pdata
);
742 return dsa_switch_add(ds
);
745 struct dsa_switch
*dsa_switch_alloc(struct device
*dev
, size_t n
)
747 size_t size
= sizeof(struct dsa_switch
) + n
* sizeof(struct dsa_port
);
748 struct dsa_switch
*ds
;
751 ds
= devm_kzalloc(dev
, size
, GFP_KERNEL
);
758 for (i
= 0; i
< ds
->num_ports
; ++i
) {
759 ds
->ports
[i
].index
= i
;
760 ds
->ports
[i
].ds
= ds
;
765 EXPORT_SYMBOL_GPL(dsa_switch_alloc
);
767 int dsa_register_switch(struct dsa_switch
*ds
)
771 mutex_lock(&dsa2_mutex
);
772 err
= dsa_switch_probe(ds
);
773 dsa_tree_put(ds
->dst
);
774 mutex_unlock(&dsa2_mutex
);
778 EXPORT_SYMBOL_GPL(dsa_register_switch
);
780 static void dsa_switch_remove(struct dsa_switch
*ds
)
782 struct dsa_switch_tree
*dst
= ds
->dst
;
783 unsigned int index
= ds
->index
;
785 dsa_tree_remove_switch(dst
, index
);
788 void dsa_unregister_switch(struct dsa_switch
*ds
)
790 mutex_lock(&dsa2_mutex
);
791 dsa_switch_remove(ds
);
792 mutex_unlock(&dsa2_mutex
);
794 EXPORT_SYMBOL_GPL(dsa_unregister_switch
);