dsa2.c 13.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
/*
 * net/dsa/dsa2.c - Hardware switch handling, binding version 2
 * Copyright (c) 2008-2009 Marvell Semiconductor
 * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
 * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <net/dsa.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include "dsa_priv.h"

static LIST_HEAD(dsa_switch_trees);
static DEFINE_MUTEX(dsa2_mutex);

static struct dsa_switch_tree *dsa_get_dst(u32 tree)
{
	struct dsa_switch_tree *dst;

	list_for_each_entry(dst, &dsa_switch_trees, list)
31 32
		if (dst->tree == tree) {
			kref_get(&dst->refcount);
33
			return dst;
34
		}
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
	return NULL;
}

static void dsa_free_dst(struct kref *ref)
{
	struct dsa_switch_tree *dst = container_of(ref, struct dsa_switch_tree,
						   refcount);

	list_del(&dst->list);
	kfree(dst);
}

static void dsa_put_dst(struct dsa_switch_tree *dst)
{
	kref_put(&dst->refcount, dsa_free_dst);
}

static struct dsa_switch_tree *dsa_add_dst(u32 tree)
{
	struct dsa_switch_tree *dst;

	dst = kzalloc(sizeof(*dst), GFP_KERNEL);
	if (!dst)
		return NULL;
	dst->tree = tree;
	INIT_LIST_HEAD(&dst->list);
	list_add_tail(&dsa_switch_trees, &dst->list);
	kref_init(&dst->refcount);

	return dst;
}

static void dsa_dst_add_ds(struct dsa_switch_tree *dst,
			   struct dsa_switch *ds, u32 index)
{
	kref_get(&dst->refcount);
	dst->ds[index] = ds;
}

static void dsa_dst_del_ds(struct dsa_switch_tree *dst,
			   struct dsa_switch *ds, u32 index)
{
	dst->ds[index] = NULL;
	kref_put(&dst->refcount, dsa_free_dst);
}

81
static bool dsa_port_is_valid(struct dsa_port *port)
82
{
83
	return !!port->dn;
84 85
}

86
static bool dsa_port_is_dsa(struct dsa_port *port)
87
{
88 89 90 91 92 93
	return !!of_parse_phandle(port->dn, "link", 0);
}

static bool dsa_port_is_cpu(struct dsa_port *port)
{
	return !!of_parse_phandle(port->dn, "ethernet", 0);
94 95
}

96 97
static bool dsa_ds_find_port_dn(struct dsa_switch *ds,
				struct device_node *port)
98 99 100 101 102 103 104 105 106
{
	u32 index;

	for (index = 0; index < DSA_MAX_PORTS; index++)
		if (ds->ports[index].dn == port)
			return true;
	return false;
}

107 108
static struct dsa_switch *dsa_dst_find_port_dn(struct dsa_switch_tree *dst,
					       struct device_node *port)
109 110 111 112 113 114 115 116 117
{
	struct dsa_switch *ds;
	u32 index;

	for (index = 0; index < DSA_MAX_SWITCHES; index++) {
		ds = dst->ds[index];
		if (!ds)
			continue;

118
		if (dsa_ds_find_port_dn(ds, port))
119 120 121 122 123 124 125 126
			return ds;
	}

	return NULL;
}

static int dsa_port_complete(struct dsa_switch_tree *dst,
			     struct dsa_switch *src_ds,
127
			     struct dsa_port *port,
128 129 130 131 132 133 134
			     u32 src_port)
{
	struct device_node *link;
	int index;
	struct dsa_switch *dst_ds;

	for (index = 0;; index++) {
135
		link = of_parse_phandle(port->dn, "link", index);
136 137 138
		if (!link)
			break;

139
		dst_ds = dsa_dst_find_port_dn(dst, link);
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
		of_node_put(link);

		if (!dst_ds)
			return 1;

		src_ds->rtable[dst_ds->index] = src_port;
	}

	return 0;
}

/* A switch is complete if all the DSA ports phandles point to ports
 * known in the tree. A return value of 1 means the tree is not
 * complete. This is not an error condition. A value of 0 is
 * success.
 */
static int dsa_ds_complete(struct dsa_switch_tree *dst, struct dsa_switch *ds)
{
158
	struct dsa_port *port;
159 160 161 162
	u32 index;
	int err;

	for (index = 0; index < DSA_MAX_PORTS; index++) {
163 164
		port = &ds->ports[index];
		if (!dsa_port_is_valid(port))
165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
			continue;

		if (!dsa_port_is_dsa(port))
			continue;

		err = dsa_port_complete(dst, ds, port, index);
		if (err != 0)
			return err;

		ds->dsa_port_mask |= BIT(index);
	}

	return 0;
}

/* A tree is complete if all the DSA ports phandles point to ports
 * known in the tree. A return value of 1 means the tree is not
 * complete. This is not an error condition. A value of 0 is
 * success.
 */
static int dsa_dst_complete(struct dsa_switch_tree *dst)
{
	struct dsa_switch *ds;
	u32 index;
	int err;

	for (index = 0; index < DSA_MAX_SWITCHES; index++) {
		ds = dst->ds[index];
		if (!ds)
			continue;

		err = dsa_ds_complete(dst, ds);
		if (err != 0)
			return err;
	}

	return 0;
}

204
static int dsa_dsa_port_apply(struct dsa_port *port, u32 index,
205 206 207 208 209 210 211 212 213 214 215 216 217 218
			      struct dsa_switch *ds)
{
	int err;

	err = dsa_cpu_dsa_setup(ds, ds->dev, port, index);
	if (err) {
		dev_warn(ds->dev, "Failed to setup dsa port %d: %d\n",
			 index, err);
		return err;
	}

	return 0;
}

219
static void dsa_dsa_port_unapply(struct dsa_port *port, u32 index,
220 221 222 223 224
				 struct dsa_switch *ds)
{
	dsa_cpu_dsa_destroy(port);
}

225
static int dsa_cpu_port_apply(struct dsa_port *port, u32 index,
226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
			      struct dsa_switch *ds)
{
	int err;

	err = dsa_cpu_dsa_setup(ds, ds->dev, port, index);
	if (err) {
		dev_warn(ds->dev, "Failed to setup cpu port %d: %d\n",
			 index, err);
		return err;
	}

	ds->cpu_port_mask |= BIT(index);

	return 0;
}

242
static void dsa_cpu_port_unapply(struct dsa_port *port, u32 index,
243 244 245 246 247 248 249
				 struct dsa_switch *ds)
{
	dsa_cpu_dsa_destroy(port);
	ds->cpu_port_mask &= ~BIT(index);

}

250
static int dsa_user_port_apply(struct dsa_port *port, u32 index,
251 252 253 254 255
			       struct dsa_switch *ds)
{
	const char *name;
	int err;

256
	name = of_get_property(port->dn, "label", NULL);
257 258
	if (!name)
		name = "eth%d";
259 260 261 262 263 264 265 266 267 268 269

	err = dsa_slave_create(ds, ds->dev, index, name);
	if (err) {
		dev_warn(ds->dev, "Failed to create slave %d: %d\n",
			 index, err);
		return err;
	}

	return 0;
}

270
static void dsa_user_port_unapply(struct dsa_port *port, u32 index,
271 272 273 274 275
				  struct dsa_switch *ds)
{
	if (ds->ports[index].netdev) {
		dsa_slave_destroy(ds->ports[index].netdev);
		ds->ports[index].netdev = NULL;
276
		ds->enabled_port_mask &= ~(1 << index);
277 278 279 280 281
	}
}

static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
{
282
	struct dsa_port *port;
283 284 285
	u32 index;
	int err;

286
	/* Initialize ds->phys_mii_mask before registering the slave MDIO bus
287
	 * driver and before ops->setup() has run, since the switch drivers and
288 289 290 291 292
	 * the slave MDIO bus driver rely on these values for probing PHY
	 * devices or not
	 */
	ds->phys_mii_mask = ds->enabled_port_mask;

293
	err = ds->ops->setup(ds);
294 295 296
	if (err < 0)
		return err;

297 298 299 300 301
	if (ds->ops->set_addr) {
		err = ds->ops->set_addr(ds, dst->master_netdev->dev_addr);
		if (err < 0)
			return err;
	}
302

303
	if (!ds->slave_mii_bus && ds->ops->phy_read) {
304 305 306 307 308 309 310 311 312 313 314
		ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
		if (!ds->slave_mii_bus)
			return -ENOMEM;

		dsa_slave_mii_bus_init(ds);

		err = mdiobus_register(ds->slave_mii_bus);
		if (err < 0)
			return err;
	}

315
	for (index = 0; index < DSA_MAX_PORTS; index++) {
316 317
		port = &ds->ports[index];
		if (!dsa_port_is_valid(port))
318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343
			continue;

		if (dsa_port_is_dsa(port)) {
			err = dsa_dsa_port_apply(port, index, ds);
			if (err)
				return err;
			continue;
		}

		if (dsa_port_is_cpu(port)) {
			err = dsa_cpu_port_apply(port, index, ds);
			if (err)
				return err;
			continue;
		}

		err = dsa_user_port_apply(port, index, ds);
		if (err)
			continue;
	}

	return 0;
}

static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
{
344
	struct dsa_port *port;
345 346 347
	u32 index;

	for (index = 0; index < DSA_MAX_PORTS; index++) {
348 349
		port = &ds->ports[index];
		if (!dsa_port_is_valid(port))
350 351 352 353 354 355 356 357 358 359 360 361 362 363
			continue;

		if (dsa_port_is_dsa(port)) {
			dsa_dsa_port_unapply(port, index, ds);
			continue;
		}

		if (dsa_port_is_cpu(port)) {
			dsa_cpu_port_unapply(port, index, ds);
			continue;
		}

		dsa_user_port_unapply(port, index, ds);
	}
364

365
	if (ds->slave_mii_bus && ds->ops->phy_read)
366
		mdiobus_unregister(ds->slave_mii_bus);
367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384
}

static int dsa_dst_apply(struct dsa_switch_tree *dst)
{
	struct dsa_switch *ds;
	u32 index;
	int err;

	for (index = 0; index < DSA_MAX_SWITCHES; index++) {
		ds = dst->ds[index];
		if (!ds)
			continue;

		err = dsa_ds_apply(dst, ds);
		if (err)
			return err;
	}

385 386
	if (dst->cpu_switch) {
		err = dsa_cpu_port_ethtool_setup(dst->cpu_switch);
387 388 389
		if (err)
			return err;
	}
390

391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
	/* If we use a tagging format that doesn't have an ethertype
	 * field, make sure that all packets from this point on get
	 * sent to the tag format's receive function.
	 */
	wmb();
	dst->master_netdev->dsa_ptr = (void *)dst;
	dst->applied = true;

	return 0;
}

static void dsa_dst_unapply(struct dsa_switch_tree *dst)
{
	struct dsa_switch *ds;
	u32 index;

	if (!dst->applied)
		return;

	dst->master_netdev->dsa_ptr = NULL;

	/* If we used a tagging format that doesn't have an ethertype
	 * field, make sure that all packets from this point get sent
	 * without the tag and go through the regular receive path.
	 */
	wmb();

	for (index = 0; index < DSA_MAX_SWITCHES; index++) {
		ds = dst->ds[index];
		if (!ds)
			continue;

		dsa_ds_unapply(dst, ds);
	}

426 427
	if (dst->cpu_switch)
		dsa_cpu_port_ethtool_restore(dst->cpu_switch);
428

429 430 431 432
	pr_info("DSA: tree %d unapplied\n", dst->tree);
	dst->applied = false;
}

433
static int dsa_cpu_parse(struct dsa_port *port, u32 index,
434 435 436
			 struct dsa_switch_tree *dst,
			 struct dsa_switch *ds)
{
437
	enum dsa_tag_protocol tag_protocol;
438 439 440
	struct net_device *ethernet_dev;
	struct device_node *ethernet;

441
	ethernet = of_parse_phandle(port->dn, "ethernet", 0);
442 443 444 445 446 447 448 449 450 451 452 453 454
	if (!ethernet)
		return -EINVAL;

	ethernet_dev = of_find_net_device_by_node(ethernet);
	if (!ethernet_dev)
		return -EPROBE_DEFER;

	if (!ds->master_netdev)
		ds->master_netdev = ethernet_dev;

	if (!dst->master_netdev)
		dst->master_netdev = ethernet_dev;

455 456
	if (!dst->cpu_switch) {
		dst->cpu_switch = ds;
457 458 459
		dst->cpu_port = index;
	}

460
	tag_protocol = ds->ops->get_tag_protocol(ds);
461
	dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
462 463 464 465 466 467 468 469 470 471 472 473
	if (IS_ERR(dst->tag_ops)) {
		dev_warn(ds->dev, "No tagger for this switch\n");
		return PTR_ERR(dst->tag_ops);
	}

	dst->rcv = dst->tag_ops->rcv;

	return 0;
}

static int dsa_ds_parse(struct dsa_switch_tree *dst, struct dsa_switch *ds)
{
474
	struct dsa_port *port;
475 476 477 478
	u32 index;
	int err;

	for (index = 0; index < DSA_MAX_PORTS; index++) {
479 480
		port = &ds->ports[index];
		if (!dsa_port_is_valid(port))
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535
			continue;

		if (dsa_port_is_cpu(port)) {
			err = dsa_cpu_parse(port, index, dst, ds);
			if (err)
				return err;
		}
	}

	pr_info("DSA: switch %d %d parsed\n", dst->tree, ds->index);

	return 0;
}

static int dsa_dst_parse(struct dsa_switch_tree *dst)
{
	struct dsa_switch *ds;
	u32 index;
	int err;

	for (index = 0; index < DSA_MAX_SWITCHES; index++) {
		ds = dst->ds[index];
		if (!ds)
			continue;

		err = dsa_ds_parse(dst, ds);
		if (err)
			return err;
	}

	if (!dst->master_netdev) {
		pr_warn("Tree has no master device\n");
		return -EINVAL;
	}

	pr_info("DSA: tree %d parsed\n", dst->tree);

	return 0;
}

static int dsa_parse_ports_dn(struct device_node *ports, struct dsa_switch *ds)
{
	struct device_node *port;
	int err;
	u32 reg;

	for_each_available_child_of_node(ports, port) {
		err = of_property_read_u32(port, "reg", &reg);
		if (err)
			return err;

		if (reg >= DSA_MAX_PORTS)
			return -EINVAL;

		ds->ports[reg].dn = port;
536

537
		/* Initialize enabled_port_mask now for ops->setup()
538 539 540
		 * to have access to a correct value, just like what
		 * net/dsa/dsa.c::dsa_switch_setup_one does.
		 */
541
		if (!dsa_port_is_cpu(&ds->ports[reg]))
542
			ds->enabled_port_mask |= 1 << reg;
543 544 545 546 547
	}

	return 0;
}

548
static int dsa_parse_member_dn(struct device_node *np, u32 *tree, u32 *index)
549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585
{
	int err;

	*tree = *index = 0;

	err = of_property_read_u32_index(np, "dsa,member", 0, tree);
	if (err) {
		/* Does not exist, but it is optional */
		if (err == -EINVAL)
			return 0;
		return err;
	}

	err = of_property_read_u32_index(np, "dsa,member", 1, index);
	if (err)
		return err;

	if (*index >= DSA_MAX_SWITCHES)
		return -EINVAL;

	return 0;
}

static struct device_node *dsa_get_ports(struct dsa_switch *ds,
					 struct device_node *np)
{
	struct device_node *ports;

	ports = of_get_child_by_name(np, "ports");
	if (!ports) {
		dev_err(ds->dev, "no ports child node found\n");
		return ERR_PTR(-EINVAL);
	}

	return ports;
}

586
static int _dsa_register_switch(struct dsa_switch *ds, struct device *dev)
587
{
588
	struct device_node *np = dev->of_node;
589
	struct dsa_switch_tree *dst;
590
	struct device_node *ports;
591
	u32 tree, index;
592
	int i, err;
593

594
	err = dsa_parse_member_dn(np, &tree, &index);
595 596 597
	if (err)
		return err;

598
	ports = dsa_get_ports(ds, np);
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
	if (IS_ERR(ports))
		return PTR_ERR(ports);

	err = dsa_parse_ports_dn(ports, ds);
	if (err)
		return err;

	dst = dsa_get_dst(tree);
	if (!dst) {
		dst = dsa_add_dst(tree);
		if (!dst)
			return -ENOMEM;
	}

	if (dst->ds[index]) {
		err = -EBUSY;
		goto out;
	}

	ds->dst = dst;
	ds->index = index;
620 621 622 623 624

	/* Initialize the routing table */
	for (i = 0; i < DSA_MAX_SWITCHES; ++i)
		ds->rtable[i] = DSA_RTABLE_NONE;

625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
	dsa_dst_add_ds(dst, ds, index);

	err = dsa_dst_complete(dst);
	if (err < 0)
		goto out_del_dst;

	if (err == 1) {
		/* Not all switches registered yet */
		err = 0;
		goto out;
	}

	if (dst->applied) {
		pr_info("DSA: Disjoint trees?\n");
		return -EINVAL;
	}

	err = dsa_dst_parse(dst);
643 644 645 646 647 648
	if (err) {
		if (err == -EPROBE_DEFER) {
			dsa_dst_del_ds(dst, ds, ds->index);
			return err;
		}

649
		goto out_del_dst;
650
	}
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668

	err = dsa_dst_apply(dst);
	if (err) {
		dsa_dst_unapply(dst);
		goto out_del_dst;
	}

	dsa_put_dst(dst);
	return 0;

out_del_dst:
	dsa_dst_del_ds(dst, ds, ds->index);
out:
	dsa_put_dst(dst);

	return err;
}

669
int dsa_register_switch(struct dsa_switch *ds, struct device *dev)
670 671 672 673
{
	int err;

	mutex_lock(&dsa2_mutex);
674
	err = _dsa_register_switch(ds, dev);
675 676 677 678 679 680
	mutex_unlock(&dsa2_mutex);

	return err;
}
EXPORT_SYMBOL_GPL(dsa_register_switch);

681
static void _dsa_unregister_switch(struct dsa_switch *ds)
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
{
	struct dsa_switch_tree *dst = ds->dst;

	dsa_dst_unapply(dst);

	dsa_dst_del_ds(dst, ds, ds->index);
}

void dsa_unregister_switch(struct dsa_switch *ds)
{
	mutex_lock(&dsa2_mutex);
	_dsa_unregister_switch(ds);
	mutex_unlock(&dsa2_mutex);
}
EXPORT_SYMBOL_GPL(dsa_unregister_switch);