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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / dsa / slave.c
blob4a0498bf6c65e8eb521bdf40ac4357b683ab46e4
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/dsa/slave.c - Slave device handling
4 * Copyright (c) 2008-2009 Marvell Semiconductor
5 */
6
7 #include <linux/list.h>
8 #include <linux/etherdevice.h>
9 #include <linux/netdevice.h>
10 #include <linux/phy.h>
11 #include <linux/phy_fixed.h>
12 #include <linux/phylink.h>
13 #include <linux/of_net.h>
14 #include <linux/of_mdio.h>
15 #include <linux/mdio.h>
16 #include <net/rtnetlink.h>
17 #include <net/pkt_cls.h>
18 #include <net/tc_act/tc_mirred.h>
19 #include <linux/if_bridge.h>
20 #include <linux/netpoll.h>
21 #include <linux/ptp_classify.h>
22
23 #include "dsa_priv.h"
24
25 /* slave mii_bus handling ***************************************************/
26 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
27 {
28 struct dsa_switch *ds = bus->priv;
29
30 if (ds->phys_mii_mask & (1 << addr))
31 return ds->ops->phy_read(ds, addr, reg);
32
33 return 0xffff;
34 }
35
36 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
37 {
38 struct dsa_switch *ds = bus->priv;
39
40 if (ds->phys_mii_mask & (1 << addr))
41 return ds->ops->phy_write(ds, addr, reg, val);
42
43 return 0;
44 }
45
46 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
47 {
48 ds->slave_mii_bus->priv = (void *)ds;
49 ds->slave_mii_bus->name = "dsa slave smi";
50 ds->slave_mii_bus->read = dsa_slave_phy_read;
51 ds->slave_mii_bus->write = dsa_slave_phy_write;
52 snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
53 ds->dst->index, ds->index);
54 ds->slave_mii_bus->parent = ds->dev;
55 ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
56 }
57
58
59 /* slave device handling ****************************************************/
60 static int dsa_slave_get_iflink(const struct net_device *dev)
61 {
62 return dsa_slave_to_master(dev)->ifindex;
63 }
64
65 static int dsa_slave_open(struct net_device *dev)
66 {
67 struct net_device *master = dsa_slave_to_master(dev);
68 struct dsa_port *dp = dsa_slave_to_port(dev);
69 int err;
70
71 if (!(master->flags & IFF_UP))
72 return -ENETDOWN;
73
74 if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
75 err = dev_uc_add(master, dev->dev_addr);
76 if (err < 0)
77 goto out;
78 }
79
80 if (dev->flags & IFF_ALLMULTI) {
81 err = dev_set_allmulti(master, 1);
82 if (err < 0)
83 goto del_unicast;
84 }
85 if (dev->flags & IFF_PROMISC) {
86 err = dev_set_promiscuity(master, 1);
87 if (err < 0)
88 goto clear_allmulti;
89 }
90
91 err = dsa_port_enable_rt(dp, dev->phydev);
92 if (err)
93 goto clear_promisc;
94
95 return 0;
96
97 clear_promisc:
98 if (dev->flags & IFF_PROMISC)
99 dev_set_promiscuity(master, -1);
100 clear_allmulti:
101 if (dev->flags & IFF_ALLMULTI)
102 dev_set_allmulti(master, -1);
103 del_unicast:
104 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
105 dev_uc_del(master, dev->dev_addr);
106 out:
107 return err;
108 }
109
110 static int dsa_slave_close(struct net_device *dev)
111 {
112 struct net_device *master = dsa_slave_to_master(dev);
113 struct dsa_port *dp = dsa_slave_to_port(dev);
114
115 dsa_port_disable_rt(dp);
116
117 dev_mc_unsync(master, dev);
118 dev_uc_unsync(master, dev);
119 if (dev->flags & IFF_ALLMULTI)
120 dev_set_allmulti(master, -1);
121 if (dev->flags & IFF_PROMISC)
122 dev_set_promiscuity(master, -1);
123
124 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
125 dev_uc_del(master, dev->dev_addr);
126
127 return 0;
128 }
129
130 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
131 {
132 struct net_device *master = dsa_slave_to_master(dev);
133 if (dev->flags & IFF_UP) {
134 if (change & IFF_ALLMULTI)
135 dev_set_allmulti(master,
136 dev->flags & IFF_ALLMULTI ? 1 : -1);
137 if (change & IFF_PROMISC)
138 dev_set_promiscuity(master,
139 dev->flags & IFF_PROMISC ? 1 : -1);
140 }
141 }
142
143 static void dsa_slave_set_rx_mode(struct net_device *dev)
144 {
145 struct net_device *master = dsa_slave_to_master(dev);
146
147 dev_mc_sync(master, dev);
148 dev_uc_sync(master, dev);
149 }
150
151 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
152 {
153 struct net_device *master = dsa_slave_to_master(dev);
154 struct sockaddr *addr = a;
155 int err;
156
157 if (!is_valid_ether_addr(addr->sa_data))
158 return -EADDRNOTAVAIL;
159
160 if (!(dev->flags & IFF_UP))
161 goto out;
162
163 if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
164 err = dev_uc_add(master, addr->sa_data);
165 if (err < 0)
166 return err;
167 }
168
169 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
170 dev_uc_del(master, dev->dev_addr);
171
172 out:
173 ether_addr_copy(dev->dev_addr, addr->sa_data);
174
175 return 0;
176 }
177
178 struct dsa_slave_dump_ctx {
179 struct net_device *dev;
180 struct sk_buff *skb;
181 struct netlink_callback *cb;
182 int idx;
183 };
184
185 static int
186 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
187 bool is_static, void *data)
188 {
189 struct dsa_slave_dump_ctx *dump = data;
190 u32 portid = NETLINK_CB(dump->cb->skb).portid;
191 u32 seq = dump->cb->nlh->nlmsg_seq;
192 struct nlmsghdr *nlh;
193 struct ndmsg *ndm;
194
195 if (dump->idx < dump->cb->args[2])
196 goto skip;
197
198 nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
199 sizeof(*ndm), NLM_F_MULTI);
200 if (!nlh)
201 return -EMSGSIZE;
202
203 ndm = nlmsg_data(nlh);
204 ndm->ndm_family = AF_BRIDGE;
205 ndm->ndm_pad1 = 0;
206 ndm->ndm_pad2 = 0;
207 ndm->ndm_flags = NTF_SELF;
208 ndm->ndm_type = 0;
209 ndm->ndm_ifindex = dump->dev->ifindex;
210 ndm->ndm_state = is_static ? NUD_NOARP : NUD_REACHABLE;
211
212 if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
213 goto nla_put_failure;
214
215 if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
216 goto nla_put_failure;
217
218 nlmsg_end(dump->skb, nlh);
219
220 skip:
221 dump->idx++;
222 return 0;
223
224 nla_put_failure:
225 nlmsg_cancel(dump->skb, nlh);
226 return -EMSGSIZE;
227 }
228
229 static int
230 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
231 struct net_device *dev, struct net_device *filter_dev,
232 int *idx)
233 {
234 struct dsa_port *dp = dsa_slave_to_port(dev);
235 struct dsa_slave_dump_ctx dump = {
236 .dev = dev,
237 .skb = skb,
238 .cb = cb,
239 .idx = *idx,
240 };
241 int err;
242
243 err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
244 *idx = dump.idx;
245
246 return err;
247 }
248
249 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
250 {
251 struct dsa_slave_priv *p = netdev_priv(dev);
252 struct dsa_switch *ds = p->dp->ds;
253 int port = p->dp->index;
254
255 /* Pass through to switch driver if it supports timestamping */
256 switch (cmd) {
257 case SIOCGHWTSTAMP:
258 if (ds->ops->port_hwtstamp_get)
259 return ds->ops->port_hwtstamp_get(ds, port, ifr);
260 break;
261 case SIOCSHWTSTAMP:
262 if (ds->ops->port_hwtstamp_set)
263 return ds->ops->port_hwtstamp_set(ds, port, ifr);
264 break;
265 }
266
267 return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
268 }
269
270 static int dsa_slave_port_attr_set(struct net_device *dev,
271 const struct switchdev_attr *attr,
272 struct switchdev_trans *trans)
273 {
274 struct dsa_port *dp = dsa_slave_to_port(dev);
275 int ret;
276
277 switch (attr->id) {
278 case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
279 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
280 break;
281 case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
282 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
283 trans);
284 break;
285 case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
286 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
287 break;
288 case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
289 ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
290 trans);
291 break;
292 case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
293 ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
294 break;
295 case SWITCHDEV_ATTR_ID_BRIDGE_MROUTER:
296 ret = dsa_port_mrouter(dp->cpu_dp, attr->u.mrouter, trans);
297 break;
298 default:
299 ret = -EOPNOTSUPP;
300 break;
301 }
302
303 return ret;
304 }
305
306 /* Must be called under rcu_read_lock() */
307 static int
308 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
309 const struct switchdev_obj_port_vlan *vlan)
310 {
311 struct net_device *upper_dev;
312 struct list_head *iter;
313
314 netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
315 u16 vid;
316
317 if (!is_vlan_dev(upper_dev))
318 continue;
319
320 vid = vlan_dev_vlan_id(upper_dev);
321 if (vid >= vlan->vid_begin && vid <= vlan->vid_end)
322 return -EBUSY;
323 }
324
325 return 0;
326 }
327
328 static int dsa_slave_vlan_add(struct net_device *dev,
329 const struct switchdev_obj *obj,
330 struct switchdev_trans *trans)
331 {
332 struct net_device *master = dsa_slave_to_master(dev);
333 struct dsa_port *dp = dsa_slave_to_port(dev);
334 struct switchdev_obj_port_vlan vlan;
335 int vid, err;
336
337 if (obj->orig_dev != dev)
338 return -EOPNOTSUPP;
339
340 if (dsa_port_skip_vlan_configuration(dp))
341 return 0;
342
343 vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
344
345 /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
346 * the same VID.
347 */
348 if (trans->ph_prepare && br_vlan_enabled(dp->bridge_dev)) {
349 rcu_read_lock();
350 err = dsa_slave_vlan_check_for_8021q_uppers(dev, &vlan);
351 rcu_read_unlock();
352 if (err)
353 return err;
354 }
355
356 err = dsa_port_vlan_add(dp, &vlan, trans);
357 if (err)
358 return err;
359
360 /* We need the dedicated CPU port to be a member of the VLAN as well.
361 * Even though drivers often handle CPU membership in special ways,
362 * it doesn't make sense to program a PVID, so clear this flag.
363 */
364 vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
365
366 err = dsa_port_vlan_add(dp->cpu_dp, &vlan, trans);
367 if (err)
368 return err;
369
370 for (vid = vlan.vid_begin; vid <= vlan.vid_end; vid++) {
371 err = vlan_vid_add(master, htons(ETH_P_8021Q), vid);
372 if (err)
373 return err;
374 }
375
376 return 0;
377 }
378
379 static int dsa_slave_port_obj_add(struct net_device *dev,
380 const struct switchdev_obj *obj,
381 struct switchdev_trans *trans,
382 struct netlink_ext_ack *extack)
383 {
384 struct dsa_port *dp = dsa_slave_to_port(dev);
385 int err;
386
387 /* For the prepare phase, ensure the full set of changes is feasable in
388 * one go in order to signal a failure properly. If an operation is not
389 * supported, return -EOPNOTSUPP.
390 */
391
392 switch (obj->id) {
393 case SWITCHDEV_OBJ_ID_PORT_MDB:
394 if (obj->orig_dev != dev)
395 return -EOPNOTSUPP;
396 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
397 break;
398 case SWITCHDEV_OBJ_ID_HOST_MDB:
399 /* DSA can directly translate this to a normal MDB add,
400 * but on the CPU port.
401 */
402 err = dsa_port_mdb_add(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj),
403 trans);
404 break;
405 case SWITCHDEV_OBJ_ID_PORT_VLAN:
406 err = dsa_slave_vlan_add(dev, obj, trans);
407 break;
408 default:
409 err = -EOPNOTSUPP;
410 break;
411 }
412
413 return err;
414 }
415
416 static int dsa_slave_vlan_del(struct net_device *dev,
417 const struct switchdev_obj *obj)
418 {
419 struct net_device *master = dsa_slave_to_master(dev);
420 struct dsa_port *dp = dsa_slave_to_port(dev);
421 struct switchdev_obj_port_vlan *vlan;
422 int vid, err;
423
424 if (obj->orig_dev != dev)
425 return -EOPNOTSUPP;
426
427 if (dsa_port_skip_vlan_configuration(dp))
428 return 0;
429
430 vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
431
432 /* Do not deprogram the CPU port as it may be shared with other user
433 * ports which can be members of this VLAN as well.
434 */
435 err = dsa_port_vlan_del(dp, vlan);
436 if (err)
437 return err;
438
439 for (vid = vlan->vid_begin; vid <= vlan->vid_end; vid++)
440 vlan_vid_del(master, htons(ETH_P_8021Q), vid);
441
442 return 0;
443 }
444
445 static int dsa_slave_port_obj_del(struct net_device *dev,
446 const struct switchdev_obj *obj)
447 {
448 struct dsa_port *dp = dsa_slave_to_port(dev);
449 int err;
450
451 switch (obj->id) {
452 case SWITCHDEV_OBJ_ID_PORT_MDB:
453 if (obj->orig_dev != dev)
454 return -EOPNOTSUPP;
455 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
456 break;
457 case SWITCHDEV_OBJ_ID_HOST_MDB:
458 /* DSA can directly translate this to a normal MDB add,
459 * but on the CPU port.
460 */
461 err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
462 break;
463 case SWITCHDEV_OBJ_ID_PORT_VLAN:
464 err = dsa_slave_vlan_del(dev, obj);
465 break;
466 default:
467 err = -EOPNOTSUPP;
468 break;
469 }
470
471 return err;
472 }
473
474 static int dsa_slave_get_port_parent_id(struct net_device *dev,
475 struct netdev_phys_item_id *ppid)
476 {
477 struct dsa_port *dp = dsa_slave_to_port(dev);
478 struct dsa_switch *ds = dp->ds;
479 struct dsa_switch_tree *dst = ds->dst;
480
481 /* For non-legacy ports, devlink is used and it takes
482 * care of the name generation. This ndo implementation
483 * should be removed with legacy support.
484 */
485 if (dp->ds->devlink)
486 return -EOPNOTSUPP;
487
488 ppid->id_len = sizeof(dst->index);
489 memcpy(&ppid->id, &dst->index, ppid->id_len);
490
491 return 0;
492 }
493
494 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
495 struct sk_buff *skb)
496 {
497 #ifdef CONFIG_NET_POLL_CONTROLLER
498 struct dsa_slave_priv *p = netdev_priv(dev);
499
500 return netpoll_send_skb(p->netpoll, skb);
501 #else
502 BUG();
503 return NETDEV_TX_OK;
504 #endif
505 }
506
507 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
508 struct sk_buff *skb)
509 {
510 struct dsa_switch *ds = p->dp->ds;
511 struct sk_buff *clone;
512 unsigned int type;
513
514 type = ptp_classify_raw(skb);
515 if (type == PTP_CLASS_NONE)
516 return;
517
518 if (!ds->ops->port_txtstamp)
519 return;
520
521 clone = skb_clone_sk(skb);
522 if (!clone)
523 return;
524
525 if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type)) {
526 DSA_SKB_CB(skb)->clone = clone;
527 return;
528 }
529
530 kfree_skb(clone);
531 }
532
533 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
534 {
535 /* SKB for netpoll still need to be mangled with the protocol-specific
536 * tag to be successfully transmitted
537 */
538 if (unlikely(netpoll_tx_running(dev)))
539 return dsa_slave_netpoll_send_skb(dev, skb);
540
541 /* Queue the SKB for transmission on the parent interface, but
542 * do not modify its EtherType
543 */
544 skb->dev = dsa_slave_to_master(dev);
545 dev_queue_xmit(skb);
546
547 return NETDEV_TX_OK;
548 }
549 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
550
551 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
552 {
553 int needed_headroom = dev->needed_headroom;
554 int needed_tailroom = dev->needed_tailroom;
555
556 /* For tail taggers, we need to pad short frames ourselves, to ensure
557 * that the tail tag does not fail at its role of being at the end of
558 * the packet, once the master interface pads the frame. Account for
559 * that pad length here, and pad later.
560 */
561 if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
562 needed_tailroom += ETH_ZLEN - skb->len;
563 /* skb_headroom() returns unsigned int... */
564 needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
565 needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
566
567 if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
568 /* No reallocation needed, yay! */
569 return 0;
570
571 return pskb_expand_head(skb, needed_headroom, needed_tailroom,
572 GFP_ATOMIC);
573 }
574
575 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
576 {
577 struct dsa_slave_priv *p = netdev_priv(dev);
578 struct sk_buff *nskb;
579
580 dev_sw_netstats_tx_add(dev, 1, skb->len);
581
582 DSA_SKB_CB(skb)->clone = NULL;
583
584 /* Identify PTP protocol packets, clone them, and pass them to the
585 * switch driver
586 */
587 dsa_skb_tx_timestamp(p, skb);
588
589 if (dsa_realloc_skb(skb, dev)) {
590 dev_kfree_skb_any(skb);
591 return NETDEV_TX_OK;
592 }
593
594 /* needed_tailroom should still be 'warm' in the cache line from
595 * dsa_realloc_skb(), which has also ensured that padding is safe.
596 */
597 if (dev->needed_tailroom)
598 eth_skb_pad(skb);
599
600 /* Transmit function may have to reallocate the original SKB,
601 * in which case it must have freed it. Only free it here on error.
602 */
603 nskb = p->xmit(skb, dev);
604 if (!nskb) {
605 kfree_skb(skb);
606 return NETDEV_TX_OK;
607 }
608
609 return dsa_enqueue_skb(nskb, dev);
610 }
611
612 /* ethtool operations *******************************************************/
613
614 static void dsa_slave_get_drvinfo(struct net_device *dev,
615 struct ethtool_drvinfo *drvinfo)
616 {
617 strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
618 strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
619 strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
620 }
621
622 static int dsa_slave_get_regs_len(struct net_device *dev)
623 {
624 struct dsa_port *dp = dsa_slave_to_port(dev);
625 struct dsa_switch *ds = dp->ds;
626
627 if (ds->ops->get_regs_len)
628 return ds->ops->get_regs_len(ds, dp->index);
629
630 return -EOPNOTSUPP;
631 }
632
633 static void
634 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
635 {
636 struct dsa_port *dp = dsa_slave_to_port(dev);
637 struct dsa_switch *ds = dp->ds;
638
639 if (ds->ops->get_regs)
640 ds->ops->get_regs(ds, dp->index, regs, _p);
641 }
642
643 static int dsa_slave_nway_reset(struct net_device *dev)
644 {
645 struct dsa_port *dp = dsa_slave_to_port(dev);
646
647 return phylink_ethtool_nway_reset(dp->pl);
648 }
649
650 static int dsa_slave_get_eeprom_len(struct net_device *dev)
651 {
652 struct dsa_port *dp = dsa_slave_to_port(dev);
653 struct dsa_switch *ds = dp->ds;
654
655 if (ds->cd && ds->cd->eeprom_len)
656 return ds->cd->eeprom_len;
657
658 if (ds->ops->get_eeprom_len)
659 return ds->ops->get_eeprom_len(ds);
660
661 return 0;
662 }
663
664 static int dsa_slave_get_eeprom(struct net_device *dev,
665 struct ethtool_eeprom *eeprom, u8 *data)
666 {
667 struct dsa_port *dp = dsa_slave_to_port(dev);
668 struct dsa_switch *ds = dp->ds;
669
670 if (ds->ops->get_eeprom)
671 return ds->ops->get_eeprom(ds, eeprom, data);
672
673 return -EOPNOTSUPP;
674 }
675
676 static int dsa_slave_set_eeprom(struct net_device *dev,
677 struct ethtool_eeprom *eeprom, u8 *data)
678 {
679 struct dsa_port *dp = dsa_slave_to_port(dev);
680 struct dsa_switch *ds = dp->ds;
681
682 if (ds->ops->set_eeprom)
683 return ds->ops->set_eeprom(ds, eeprom, data);
684
685 return -EOPNOTSUPP;
686 }
687
688 static void dsa_slave_get_strings(struct net_device *dev,
689 uint32_t stringset, uint8_t *data)
690 {
691 struct dsa_port *dp = dsa_slave_to_port(dev);
692 struct dsa_switch *ds = dp->ds;
693
694 if (stringset == ETH_SS_STATS) {
695 int len = ETH_GSTRING_LEN;
696
697 strncpy(data, "tx_packets", len);
698 strncpy(data + len, "tx_bytes", len);
699 strncpy(data + 2 * len, "rx_packets", len);
700 strncpy(data + 3 * len, "rx_bytes", len);
701 if (ds->ops->get_strings)
702 ds->ops->get_strings(ds, dp->index, stringset,
703 data + 4 * len);
704 }
705 }
706
707 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
708 struct ethtool_stats *stats,
709 uint64_t *data)
710 {
711 struct dsa_port *dp = dsa_slave_to_port(dev);
712 struct dsa_switch *ds = dp->ds;
713 struct pcpu_sw_netstats *s;
714 unsigned int start;
715 int i;
716
717 for_each_possible_cpu(i) {
718 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
719
720 s = per_cpu_ptr(dev->tstats, i);
721 do {
722 start = u64_stats_fetch_begin_irq(&s->syncp);
723 tx_packets = s->tx_packets;
724 tx_bytes = s->tx_bytes;
725 rx_packets = s->rx_packets;
726 rx_bytes = s->rx_bytes;
727 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
728 data[0] += tx_packets;
729 data[1] += tx_bytes;
730 data[2] += rx_packets;
731 data[3] += rx_bytes;
732 }
733 if (ds->ops->get_ethtool_stats)
734 ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
735 }
736
737 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
738 {
739 struct dsa_port *dp = dsa_slave_to_port(dev);
740 struct dsa_switch *ds = dp->ds;
741
742 if (sset == ETH_SS_STATS) {
743 int count;
744
745 count = 4;
746 if (ds->ops->get_sset_count)
747 count += ds->ops->get_sset_count(ds, dp->index, sset);
748
749 return count;
750 }
751
752 return -EOPNOTSUPP;
753 }
754
755 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
756 {
757 struct dsa_port *dp = dsa_slave_to_port(dev);
758 struct dsa_switch *ds = dp->ds;
759
760 phylink_ethtool_get_wol(dp->pl, w);
761
762 if (ds->ops->get_wol)
763 ds->ops->get_wol(ds, dp->index, w);
764 }
765
766 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
767 {
768 struct dsa_port *dp = dsa_slave_to_port(dev);
769 struct dsa_switch *ds = dp->ds;
770 int ret = -EOPNOTSUPP;
771
772 phylink_ethtool_set_wol(dp->pl, w);
773
774 if (ds->ops->set_wol)
775 ret = ds->ops->set_wol(ds, dp->index, w);
776
777 return ret;
778 }
779
780 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
781 {
782 struct dsa_port *dp = dsa_slave_to_port(dev);
783 struct dsa_switch *ds = dp->ds;
784 int ret;
785
786 /* Port's PHY and MAC both need to be EEE capable */
787 if (!dev->phydev || !dp->pl)
788 return -ENODEV;
789
790 if (!ds->ops->set_mac_eee)
791 return -EOPNOTSUPP;
792
793 ret = ds->ops->set_mac_eee(ds, dp->index, e);
794 if (ret)
795 return ret;
796
797 return phylink_ethtool_set_eee(dp->pl, e);
798 }
799
800 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
801 {
802 struct dsa_port *dp = dsa_slave_to_port(dev);
803 struct dsa_switch *ds = dp->ds;
804 int ret;
805
806 /* Port's PHY and MAC both need to be EEE capable */
807 if (!dev->phydev || !dp->pl)
808 return -ENODEV;
809
810 if (!ds->ops->get_mac_eee)
811 return -EOPNOTSUPP;
812
813 ret = ds->ops->get_mac_eee(ds, dp->index, e);
814 if (ret)
815 return ret;
816
817 return phylink_ethtool_get_eee(dp->pl, e);
818 }
819
820 static int dsa_slave_get_link_ksettings(struct net_device *dev,
821 struct ethtool_link_ksettings *cmd)
822 {
823 struct dsa_port *dp = dsa_slave_to_port(dev);
824
825 return phylink_ethtool_ksettings_get(dp->pl, cmd);
826 }
827
828 static int dsa_slave_set_link_ksettings(struct net_device *dev,
829 const struct ethtool_link_ksettings *cmd)
830 {
831 struct dsa_port *dp = dsa_slave_to_port(dev);
832
833 return phylink_ethtool_ksettings_set(dp->pl, cmd);
834 }
835
836 static void dsa_slave_get_pauseparam(struct net_device *dev,
837 struct ethtool_pauseparam *pause)
838 {
839 struct dsa_port *dp = dsa_slave_to_port(dev);
840
841 phylink_ethtool_get_pauseparam(dp->pl, pause);
842 }
843
844 static int dsa_slave_set_pauseparam(struct net_device *dev,
845 struct ethtool_pauseparam *pause)
846 {
847 struct dsa_port *dp = dsa_slave_to_port(dev);
848
849 return phylink_ethtool_set_pauseparam(dp->pl, pause);
850 }
851
852 #ifdef CONFIG_NET_POLL_CONTROLLER
853 static int dsa_slave_netpoll_setup(struct net_device *dev,
854 struct netpoll_info *ni)
855 {
856 struct net_device *master = dsa_slave_to_master(dev);
857 struct dsa_slave_priv *p = netdev_priv(dev);
858 struct netpoll *netpoll;
859 int err = 0;
860
861 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
862 if (!netpoll)
863 return -ENOMEM;
864
865 err = __netpoll_setup(netpoll, master);
866 if (err) {
867 kfree(netpoll);
868 goto out;
869 }
870
871 p->netpoll = netpoll;
872 out:
873 return err;
874 }
875
876 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
877 {
878 struct dsa_slave_priv *p = netdev_priv(dev);
879 struct netpoll *netpoll = p->netpoll;
880
881 if (!netpoll)
882 return;
883
884 p->netpoll = NULL;
885
886 __netpoll_free(netpoll);
887 }
888
889 static void dsa_slave_poll_controller(struct net_device *dev)
890 {
891 }
892 #endif
893
894 static int dsa_slave_get_phys_port_name(struct net_device *dev,
895 char *name, size_t len)
896 {
897 struct dsa_port *dp = dsa_slave_to_port(dev);
898
899 /* For non-legacy ports, devlink is used and it takes
900 * care of the name generation. This ndo implementation
901 * should be removed with legacy support.
902 */
903 if (dp->ds->devlink)
904 return -EOPNOTSUPP;
905
906 if (snprintf(name, len, "p%d", dp->index) >= len)
907 return -EINVAL;
908
909 return 0;
910 }
911
912 static struct dsa_mall_tc_entry *
913 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
914 {
915 struct dsa_slave_priv *p = netdev_priv(dev);
916 struct dsa_mall_tc_entry *mall_tc_entry;
917
918 list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
919 if (mall_tc_entry->cookie == cookie)
920 return mall_tc_entry;
921
922 return NULL;
923 }
924
925 static int
926 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
927 struct tc_cls_matchall_offload *cls,
928 bool ingress)
929 {
930 struct dsa_port *dp = dsa_slave_to_port(dev);
931 struct dsa_slave_priv *p = netdev_priv(dev);
932 struct dsa_mall_mirror_tc_entry *mirror;
933 struct dsa_mall_tc_entry *mall_tc_entry;
934 struct dsa_switch *ds = dp->ds;
935 struct flow_action_entry *act;
936 struct dsa_port *to_dp;
937 int err;
938
939 if (!ds->ops->port_mirror_add)
940 return -EOPNOTSUPP;
941
942 if (!flow_action_basic_hw_stats_check(&cls->rule->action,
943 cls->common.extack))
944 return -EOPNOTSUPP;
945
946 act = &cls->rule->action.entries[0];
947
948 if (!act->dev)
949 return -EINVAL;
950
951 if (!dsa_slave_dev_check(act->dev))
952 return -EOPNOTSUPP;
953
954 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
955 if (!mall_tc_entry)
956 return -ENOMEM;
957
958 mall_tc_entry->cookie = cls->cookie;
959 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
960 mirror = &mall_tc_entry->mirror;
961
962 to_dp = dsa_slave_to_port(act->dev);
963
964 mirror->to_local_port = to_dp->index;
965 mirror->ingress = ingress;
966
967 err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress);
968 if (err) {
969 kfree(mall_tc_entry);
970 return err;
971 }
972
973 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
974
975 return err;
976 }
977
978 static int
979 dsa_slave_add_cls_matchall_police(struct net_device *dev,
980 struct tc_cls_matchall_offload *cls,
981 bool ingress)
982 {
983 struct netlink_ext_ack *extack = cls->common.extack;
984 struct dsa_port *dp = dsa_slave_to_port(dev);
985 struct dsa_slave_priv *p = netdev_priv(dev);
986 struct dsa_mall_policer_tc_entry *policer;
987 struct dsa_mall_tc_entry *mall_tc_entry;
988 struct dsa_switch *ds = dp->ds;
989 struct flow_action_entry *act;
990 int err;
991
992 if (!ds->ops->port_policer_add) {
993 NL_SET_ERR_MSG_MOD(extack,
994 "Policing offload not implemented");
995 return -EOPNOTSUPP;
996 }
997
998 if (!ingress) {
999 NL_SET_ERR_MSG_MOD(extack,
1000 "Only supported on ingress qdisc");
1001 return -EOPNOTSUPP;
1002 }
1003
1004 if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1005 cls->common.extack))
1006 return -EOPNOTSUPP;
1007
1008 list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1009 if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1010 NL_SET_ERR_MSG_MOD(extack,
1011 "Only one port policer allowed");
1012 return -EEXIST;
1013 }
1014 }
1015
1016 act = &cls->rule->action.entries[0];
1017
1018 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1019 if (!mall_tc_entry)
1020 return -ENOMEM;
1021
1022 mall_tc_entry->cookie = cls->cookie;
1023 mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1024 policer = &mall_tc_entry->policer;
1025 policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1026 policer->burst = act->police.burst;
1027
1028 err = ds->ops->port_policer_add(ds, dp->index, policer);
1029 if (err) {
1030 kfree(mall_tc_entry);
1031 return err;
1032 }
1033
1034 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1035
1036 return err;
1037 }
1038
1039 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1040 struct tc_cls_matchall_offload *cls,
1041 bool ingress)
1042 {
1043 int err = -EOPNOTSUPP;
1044
1045 if (cls->common.protocol == htons(ETH_P_ALL) &&
1046 flow_offload_has_one_action(&cls->rule->action) &&
1047 cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1048 err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1049 else if (flow_offload_has_one_action(&cls->rule->action) &&
1050 cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1051 err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1052
1053 return err;
1054 }
1055
1056 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1057 struct tc_cls_matchall_offload *cls)
1058 {
1059 struct dsa_port *dp = dsa_slave_to_port(dev);
1060 struct dsa_mall_tc_entry *mall_tc_entry;
1061 struct dsa_switch *ds = dp->ds;
1062
1063 mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1064 if (!mall_tc_entry)
1065 return;
1066
1067 list_del(&mall_tc_entry->list);
1068
1069 switch (mall_tc_entry->type) {
1070 case DSA_PORT_MALL_MIRROR:
1071 if (ds->ops->port_mirror_del)
1072 ds->ops->port_mirror_del(ds, dp->index,
1073 &mall_tc_entry->mirror);
1074 break;
1075 case DSA_PORT_MALL_POLICER:
1076 if (ds->ops->port_policer_del)
1077 ds->ops->port_policer_del(ds, dp->index);
1078 break;
1079 default:
1080 WARN_ON(1);
1081 }
1082
1083 kfree(mall_tc_entry);
1084 }
1085
1086 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1087 struct tc_cls_matchall_offload *cls,
1088 bool ingress)
1089 {
1090 if (cls->common.chain_index)
1091 return -EOPNOTSUPP;
1092
1093 switch (cls->command) {
1094 case TC_CLSMATCHALL_REPLACE:
1095 return dsa_slave_add_cls_matchall(dev, cls, ingress);
1096 case TC_CLSMATCHALL_DESTROY:
1097 dsa_slave_del_cls_matchall(dev, cls);
1098 return 0;
1099 default:
1100 return -EOPNOTSUPP;
1101 }
1102 }
1103
1104 static int dsa_slave_add_cls_flower(struct net_device *dev,
1105 struct flow_cls_offload *cls,
1106 bool ingress)
1107 {
1108 struct dsa_port *dp = dsa_slave_to_port(dev);
1109 struct dsa_switch *ds = dp->ds;
1110 int port = dp->index;
1111
1112 if (!ds->ops->cls_flower_add)
1113 return -EOPNOTSUPP;
1114
1115 return ds->ops->cls_flower_add(ds, port, cls, ingress);
1116 }
1117
1118 static int dsa_slave_del_cls_flower(struct net_device *dev,
1119 struct flow_cls_offload *cls,
1120 bool ingress)
1121 {
1122 struct dsa_port *dp = dsa_slave_to_port(dev);
1123 struct dsa_switch *ds = dp->ds;
1124 int port = dp->index;
1125
1126 if (!ds->ops->cls_flower_del)
1127 return -EOPNOTSUPP;
1128
1129 return ds->ops->cls_flower_del(ds, port, cls, ingress);
1130 }
1131
1132 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1133 struct flow_cls_offload *cls,
1134 bool ingress)
1135 {
1136 struct dsa_port *dp = dsa_slave_to_port(dev);
1137 struct dsa_switch *ds = dp->ds;
1138 int port = dp->index;
1139
1140 if (!ds->ops->cls_flower_stats)
1141 return -EOPNOTSUPP;
1142
1143 return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1144 }
1145
1146 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1147 struct flow_cls_offload *cls,
1148 bool ingress)
1149 {
1150 switch (cls->command) {
1151 case FLOW_CLS_REPLACE:
1152 return dsa_slave_add_cls_flower(dev, cls, ingress);
1153 case FLOW_CLS_DESTROY:
1154 return dsa_slave_del_cls_flower(dev, cls, ingress);
1155 case FLOW_CLS_STATS:
1156 return dsa_slave_stats_cls_flower(dev, cls, ingress);
1157 default:
1158 return -EOPNOTSUPP;
1159 }
1160 }
1161
1162 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1163 void *cb_priv, bool ingress)
1164 {
1165 struct net_device *dev = cb_priv;
1166
1167 if (!tc_can_offload(dev))
1168 return -EOPNOTSUPP;
1169
1170 switch (type) {
1171 case TC_SETUP_CLSMATCHALL:
1172 return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1173 case TC_SETUP_CLSFLOWER:
1174 return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1175 default:
1176 return -EOPNOTSUPP;
1177 }
1178 }
1179
1180 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1181 void *type_data, void *cb_priv)
1182 {
1183 return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1184 }
1185
1186 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1187 void *type_data, void *cb_priv)
1188 {
1189 return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1190 }
1191
1192 static LIST_HEAD(dsa_slave_block_cb_list);
1193
1194 static int dsa_slave_setup_tc_block(struct net_device *dev,
1195 struct flow_block_offload *f)
1196 {
1197 struct flow_block_cb *block_cb;
1198 flow_setup_cb_t *cb;
1199
1200 if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1201 cb = dsa_slave_setup_tc_block_cb_ig;
1202 else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1203 cb = dsa_slave_setup_tc_block_cb_eg;
1204 else
1205 return -EOPNOTSUPP;
1206
1207 f->driver_block_list = &dsa_slave_block_cb_list;
1208
1209 switch (f->command) {
1210 case FLOW_BLOCK_BIND:
1211 if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1212 return -EBUSY;
1213
1214 block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1215 if (IS_ERR(block_cb))
1216 return PTR_ERR(block_cb);
1217
1218 flow_block_cb_add(block_cb, f);
1219 list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1220 return 0;
1221 case FLOW_BLOCK_UNBIND:
1222 block_cb = flow_block_cb_lookup(f->block, cb, dev);
1223 if (!block_cb)
1224 return -ENOENT;
1225
1226 flow_block_cb_remove(block_cb, f);
1227 list_del(&block_cb->driver_list);
1228 return 0;
1229 default:
1230 return -EOPNOTSUPP;
1231 }
1232 }
1233
1234 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1235 void *type_data)
1236 {
1237 struct dsa_port *dp = dsa_slave_to_port(dev);
1238 struct dsa_switch *ds = dp->ds;
1239
1240 if (type == TC_SETUP_BLOCK)
1241 return dsa_slave_setup_tc_block(dev, type_data);
1242
1243 if (!ds->ops->port_setup_tc)
1244 return -EOPNOTSUPP;
1245
1246 return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1247 }
1248
1249 static int dsa_slave_get_rxnfc(struct net_device *dev,
1250 struct ethtool_rxnfc *nfc, u32 *rule_locs)
1251 {
1252 struct dsa_port *dp = dsa_slave_to_port(dev);
1253 struct dsa_switch *ds = dp->ds;
1254
1255 if (!ds->ops->get_rxnfc)
1256 return -EOPNOTSUPP;
1257
1258 return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1259 }
1260
1261 static int dsa_slave_set_rxnfc(struct net_device *dev,
1262 struct ethtool_rxnfc *nfc)
1263 {
1264 struct dsa_port *dp = dsa_slave_to_port(dev);
1265 struct dsa_switch *ds = dp->ds;
1266
1267 if (!ds->ops->set_rxnfc)
1268 return -EOPNOTSUPP;
1269
1270 return ds->ops->set_rxnfc(ds, dp->index, nfc);
1271 }
1272
1273 static int dsa_slave_get_ts_info(struct net_device *dev,
1274 struct ethtool_ts_info *ts)
1275 {
1276 struct dsa_slave_priv *p = netdev_priv(dev);
1277 struct dsa_switch *ds = p->dp->ds;
1278
1279 if (!ds->ops->get_ts_info)
1280 return -EOPNOTSUPP;
1281
1282 return ds->ops->get_ts_info(ds, p->dp->index, ts);
1283 }
1284
1285 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1286 u16 vid)
1287 {
1288 struct net_device *master = dsa_slave_to_master(dev);
1289 struct dsa_port *dp = dsa_slave_to_port(dev);
1290 struct switchdev_obj_port_vlan vlan = {
1291 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1292 .vid_begin = vid,
1293 .vid_end = vid,
1294 /* This API only allows programming tagged, non-PVID VIDs */
1295 .flags = 0,
1296 };
1297 struct switchdev_trans trans;
1298 int ret;
1299
1300 /* User port... */
1301 trans.ph_prepare = true;
1302 ret = dsa_port_vlan_add(dp, &vlan, &trans);
1303 if (ret)
1304 return ret;
1305
1306 trans.ph_prepare = false;
1307 ret = dsa_port_vlan_add(dp, &vlan, &trans);
1308 if (ret)
1309 return ret;
1310
1311 /* And CPU port... */
1312 trans.ph_prepare = true;
1313 ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1314 if (ret)
1315 return ret;
1316
1317 trans.ph_prepare = false;
1318 ret = dsa_port_vlan_add(dp->cpu_dp, &vlan, &trans);
1319 if (ret)
1320 return ret;
1321
1322 return vlan_vid_add(master, proto, vid);
1323 }
1324
1325 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1326 u16 vid)
1327 {
1328 struct net_device *master = dsa_slave_to_master(dev);
1329 struct dsa_port *dp = dsa_slave_to_port(dev);
1330 struct switchdev_obj_port_vlan vlan = {
1331 .vid_begin = vid,
1332 .vid_end = vid,
1333 /* This API only allows programming tagged, non-PVID VIDs */
1334 .flags = 0,
1335 };
1336 int err;
1337
1338 /* Do not deprogram the CPU port as it may be shared with other user
1339 * ports which can be members of this VLAN as well.
1340 */
1341 err = dsa_port_vlan_del(dp, &vlan);
1342 if (err)
1343 return err;
1344
1345 vlan_vid_del(master, proto, vid);
1346
1347 return 0;
1348 }
1349
1350 struct dsa_hw_port {
1351 struct list_head list;
1352 struct net_device *dev;
1353 int old_mtu;
1354 };
1355
1356 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1357 {
1358 const struct dsa_hw_port *p;
1359 int err;
1360
1361 list_for_each_entry(p, hw_port_list, list) {
1362 if (p->dev->mtu == mtu)
1363 continue;
1364
1365 err = dev_set_mtu(p->dev, mtu);
1366 if (err)
1367 goto rollback;
1368 }
1369
1370 return 0;
1371
1372 rollback:
1373 list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1374 if (p->dev->mtu == p->old_mtu)
1375 continue;
1376
1377 if (dev_set_mtu(p->dev, p->old_mtu))
1378 netdev_err(p->dev, "Failed to restore MTU\n");
1379 }
1380
1381 return err;
1382 }
1383
1384 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1385 {
1386 struct dsa_hw_port *p, *n;
1387
1388 list_for_each_entry_safe(p, n, hw_port_list, list)
1389 kfree(p);
1390 }
1391
1392 /* Make the hardware datapath to/from @dev limited to a common MTU */
1393 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1394 {
1395 struct list_head hw_port_list;
1396 struct dsa_switch_tree *dst;
1397 int min_mtu = ETH_MAX_MTU;
1398 struct dsa_port *other_dp;
1399 int err;
1400
1401 if (!dp->ds->mtu_enforcement_ingress)
1402 return;
1403
1404 if (!dp->bridge_dev)
1405 return;
1406
1407 INIT_LIST_HEAD(&hw_port_list);
1408
1409 /* Populate the list of ports that are part of the same bridge
1410 * as the newly added/modified port
1411 */
1412 list_for_each_entry(dst, &dsa_tree_list, list) {
1413 list_for_each_entry(other_dp, &dst->ports, list) {
1414 struct dsa_hw_port *hw_port;
1415 struct net_device *slave;
1416
1417 if (other_dp->type != DSA_PORT_TYPE_USER)
1418 continue;
1419
1420 if (other_dp->bridge_dev != dp->bridge_dev)
1421 continue;
1422
1423 if (!other_dp->ds->mtu_enforcement_ingress)
1424 continue;
1425
1426 slave = other_dp->slave;
1427
1428 if (min_mtu > slave->mtu)
1429 min_mtu = slave->mtu;
1430
1431 hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1432 if (!hw_port)
1433 goto out;
1434
1435 hw_port->dev = slave;
1436 hw_port->old_mtu = slave->mtu;
1437
1438 list_add(&hw_port->list, &hw_port_list);
1439 }
1440 }
1441
1442 /* Attempt to configure the entire hardware bridge to the newly added
1443 * interface's MTU first, regardless of whether the intention of the
1444 * user was to raise or lower it.
1445 */
1446 err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1447 if (!err)
1448 goto out;
1449
1450 /* Clearly that didn't work out so well, so just set the minimum MTU on
1451 * all hardware bridge ports now. If this fails too, then all ports will
1452 * still have their old MTU rolled back anyway.
1453 */
1454 dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1455
1456 out:
1457 dsa_hw_port_list_free(&hw_port_list);
1458 }
1459
1460 static int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1461 {
1462 struct net_device *master = dsa_slave_to_master(dev);
1463 struct dsa_port *dp = dsa_slave_to_port(dev);
1464 struct dsa_slave_priv *p = netdev_priv(dev);
1465 struct dsa_switch *ds = p->dp->ds;
1466 struct dsa_port *cpu_dp;
1467 int port = p->dp->index;
1468 int largest_mtu = 0;
1469 int new_master_mtu;
1470 int old_master_mtu;
1471 int mtu_limit;
1472 int cpu_mtu;
1473 int err, i;
1474
1475 if (!ds->ops->port_change_mtu)
1476 return -EOPNOTSUPP;
1477
1478 for (i = 0; i < ds->num_ports; i++) {
1479 int slave_mtu;
1480
1481 if (!dsa_is_user_port(ds, i))
1482 continue;
1483
1484 /* During probe, this function will be called for each slave
1485 * device, while not all of them have been allocated. That's
1486 * ok, it doesn't change what the maximum is, so ignore it.
1487 */
1488 if (!dsa_to_port(ds, i)->slave)
1489 continue;
1490
1491 /* Pretend that we already applied the setting, which we
1492 * actually haven't (still haven't done all integrity checks)
1493 */
1494 if (i == port)
1495 slave_mtu = new_mtu;
1496 else
1497 slave_mtu = dsa_to_port(ds, i)->slave->mtu;
1498
1499 if (largest_mtu < slave_mtu)
1500 largest_mtu = slave_mtu;
1501 }
1502
1503 cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1504
1505 mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1506 old_master_mtu = master->mtu;
1507 new_master_mtu = largest_mtu + cpu_dp->tag_ops->overhead;
1508 if (new_master_mtu > mtu_limit)
1509 return -ERANGE;
1510
1511 /* If the master MTU isn't over limit, there's no need to check the CPU
1512 * MTU, since that surely isn't either.
1513 */
1514 cpu_mtu = largest_mtu;
1515
1516 /* Start applying stuff */
1517 if (new_master_mtu != old_master_mtu) {
1518 err = dev_set_mtu(master, new_master_mtu);
1519 if (err < 0)
1520 goto out_master_failed;
1521
1522 /* We only need to propagate the MTU of the CPU port to
1523 * upstream switches.
1524 */
1525 err = dsa_port_mtu_change(cpu_dp, cpu_mtu, true);
1526 if (err)
1527 goto out_cpu_failed;
1528 }
1529
1530 err = dsa_port_mtu_change(dp, new_mtu, false);
1531 if (err)
1532 goto out_port_failed;
1533
1534 dev->mtu = new_mtu;
1535
1536 dsa_bridge_mtu_normalization(dp);
1537
1538 return 0;
1539
1540 out_port_failed:
1541 if (new_master_mtu != old_master_mtu)
1542 dsa_port_mtu_change(cpu_dp, old_master_mtu -
1543 cpu_dp->tag_ops->overhead,
1544 true);
1545 out_cpu_failed:
1546 if (new_master_mtu != old_master_mtu)
1547 dev_set_mtu(master, old_master_mtu);
1548 out_master_failed:
1549 return err;
1550 }
1551
1552 static const struct ethtool_ops dsa_slave_ethtool_ops = {
1553 .get_drvinfo = dsa_slave_get_drvinfo,
1554 .get_regs_len = dsa_slave_get_regs_len,
1555 .get_regs = dsa_slave_get_regs,
1556 .nway_reset = dsa_slave_nway_reset,
1557 .get_link = ethtool_op_get_link,
1558 .get_eeprom_len = dsa_slave_get_eeprom_len,
1559 .get_eeprom = dsa_slave_get_eeprom,
1560 .set_eeprom = dsa_slave_set_eeprom,
1561 .get_strings = dsa_slave_get_strings,
1562 .get_ethtool_stats = dsa_slave_get_ethtool_stats,
1563 .get_sset_count = dsa_slave_get_sset_count,
1564 .set_wol = dsa_slave_set_wol,
1565 .get_wol = dsa_slave_get_wol,
1566 .set_eee = dsa_slave_set_eee,
1567 .get_eee = dsa_slave_get_eee,
1568 .get_link_ksettings = dsa_slave_get_link_ksettings,
1569 .set_link_ksettings = dsa_slave_set_link_ksettings,
1570 .get_pauseparam = dsa_slave_get_pauseparam,
1571 .set_pauseparam = dsa_slave_set_pauseparam,
1572 .get_rxnfc = dsa_slave_get_rxnfc,
1573 .set_rxnfc = dsa_slave_set_rxnfc,
1574 .get_ts_info = dsa_slave_get_ts_info,
1575 };
1576
1577 /* legacy way, bypassing the bridge *****************************************/
1578 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1579 struct net_device *dev,
1580 const unsigned char *addr, u16 vid,
1581 u16 flags,
1582 struct netlink_ext_ack *extack)
1583 {
1584 struct dsa_port *dp = dsa_slave_to_port(dev);
1585
1586 return dsa_port_fdb_add(dp, addr, vid);
1587 }
1588
1589 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1590 struct net_device *dev,
1591 const unsigned char *addr, u16 vid)
1592 {
1593 struct dsa_port *dp = dsa_slave_to_port(dev);
1594
1595 return dsa_port_fdb_del(dp, addr, vid);
1596 }
1597
1598 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
1599 {
1600 struct dsa_port *dp = dsa_slave_to_port(dev);
1601
1602 return dp->ds->devlink ? &dp->devlink_port : NULL;
1603 }
1604
1605 static const struct net_device_ops dsa_slave_netdev_ops = {
1606 .ndo_open = dsa_slave_open,
1607 .ndo_stop = dsa_slave_close,
1608 .ndo_start_xmit = dsa_slave_xmit,
1609 .ndo_change_rx_flags = dsa_slave_change_rx_flags,
1610 .ndo_set_rx_mode = dsa_slave_set_rx_mode,
1611 .ndo_set_mac_address = dsa_slave_set_mac_address,
1612 .ndo_fdb_add = dsa_legacy_fdb_add,
1613 .ndo_fdb_del = dsa_legacy_fdb_del,
1614 .ndo_fdb_dump = dsa_slave_fdb_dump,
1615 .ndo_do_ioctl = dsa_slave_ioctl,
1616 .ndo_get_iflink = dsa_slave_get_iflink,
1617 #ifdef CONFIG_NET_POLL_CONTROLLER
1618 .ndo_netpoll_setup = dsa_slave_netpoll_setup,
1619 .ndo_netpoll_cleanup = dsa_slave_netpoll_cleanup,
1620 .ndo_poll_controller = dsa_slave_poll_controller,
1621 #endif
1622 .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
1623 .ndo_setup_tc = dsa_slave_setup_tc,
1624 .ndo_get_stats64 = dev_get_tstats64,
1625 .ndo_get_port_parent_id = dsa_slave_get_port_parent_id,
1626 .ndo_vlan_rx_add_vid = dsa_slave_vlan_rx_add_vid,
1627 .ndo_vlan_rx_kill_vid = dsa_slave_vlan_rx_kill_vid,
1628 .ndo_get_devlink_port = dsa_slave_get_devlink_port,
1629 .ndo_change_mtu = dsa_slave_change_mtu,
1630 };
1631
1632 static struct device_type dsa_type = {
1633 .name = "dsa",
1634 };
1635
1636 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
1637 {
1638 const struct dsa_port *dp = dsa_to_port(ds, port);
1639
1640 if (dp->pl)
1641 phylink_mac_change(dp->pl, up);
1642 }
1643 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
1644
1645 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
1646 struct phylink_link_state *state)
1647 {
1648 struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
1649 struct dsa_switch *ds = dp->ds;
1650
1651 /* No need to check that this operation is valid, the callback would
1652 * not be called if it was not.
1653 */
1654 ds->ops->phylink_fixed_state(ds, dp->index, state);
1655 }
1656
1657 /* slave device setup *******************************************************/
1658 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
1659 {
1660 struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1661 struct dsa_switch *ds = dp->ds;
1662
1663 slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
1664 if (!slave_dev->phydev) {
1665 netdev_err(slave_dev, "no phy at %d\n", addr);
1666 return -ENODEV;
1667 }
1668
1669 return phylink_connect_phy(dp->pl, slave_dev->phydev);
1670 }
1671
1672 static int dsa_slave_phy_setup(struct net_device *slave_dev)
1673 {
1674 struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1675 struct device_node *port_dn = dp->dn;
1676 struct dsa_switch *ds = dp->ds;
1677 phy_interface_t mode;
1678 u32 phy_flags = 0;
1679 int ret;
1680
1681 ret = of_get_phy_mode(port_dn, &mode);
1682 if (ret)
1683 mode = PHY_INTERFACE_MODE_NA;
1684
1685 dp->pl_config.dev = &slave_dev->dev;
1686 dp->pl_config.type = PHYLINK_NETDEV;
1687
1688 /* The get_fixed_state callback takes precedence over polling the
1689 * link GPIO in PHYLINK (see phylink_get_fixed_state). Only set
1690 * this if the switch provides such a callback.
1691 */
1692 if (ds->ops->phylink_fixed_state) {
1693 dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
1694 dp->pl_config.poll_fixed_state = true;
1695 }
1696
1697 dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
1698 &dsa_port_phylink_mac_ops);
1699 if (IS_ERR(dp->pl)) {
1700 netdev_err(slave_dev,
1701 "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
1702 return PTR_ERR(dp->pl);
1703 }
1704
1705 if (ds->ops->get_phy_flags)
1706 phy_flags = ds->ops->get_phy_flags(ds, dp->index);
1707
1708 ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
1709 if (ret == -ENODEV && ds->slave_mii_bus) {
1710 /* We could not connect to a designated PHY or SFP, so try to
1711 * use the switch internal MDIO bus instead
1712 */
1713 ret = dsa_slave_phy_connect(slave_dev, dp->index);
1714 if (ret) {
1715 netdev_err(slave_dev,
1716 "failed to connect to port %d: %d\n",
1717 dp->index, ret);
1718 phylink_destroy(dp->pl);
1719 return ret;
1720 }
1721 }
1722
1723 return ret;
1724 }
1725
1726 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1727 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1728 struct netdev_queue *txq,
1729 void *_unused)
1730 {
1731 lockdep_set_class(&txq->_xmit_lock,
1732 &dsa_slave_netdev_xmit_lock_key);
1733 }
1734
1735 int dsa_slave_suspend(struct net_device *slave_dev)
1736 {
1737 struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1738
1739 if (!netif_running(slave_dev))
1740 return 0;
1741
1742 netif_device_detach(slave_dev);
1743
1744 rtnl_lock();
1745 phylink_stop(dp->pl);
1746 rtnl_unlock();
1747
1748 return 0;
1749 }
1750
1751 int dsa_slave_resume(struct net_device *slave_dev)
1752 {
1753 struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1754
1755 if (!netif_running(slave_dev))
1756 return 0;
1757
1758 netif_device_attach(slave_dev);
1759
1760 rtnl_lock();
1761 phylink_start(dp->pl);
1762 rtnl_unlock();
1763
1764 return 0;
1765 }
1766
1767 static void dsa_slave_notify(struct net_device *dev, unsigned long val)
1768 {
1769 struct net_device *master = dsa_slave_to_master(dev);
1770 struct dsa_port *dp = dsa_slave_to_port(dev);
1771 struct dsa_notifier_register_info rinfo = {
1772 .switch_number = dp->ds->index,
1773 .port_number = dp->index,
1774 .master = master,
1775 .info.dev = dev,
1776 };
1777
1778 call_dsa_notifiers(val, dev, &rinfo.info);
1779 }
1780
1781 int dsa_slave_create(struct dsa_port *port)
1782 {
1783 const struct dsa_port *cpu_dp = port->cpu_dp;
1784 struct net_device *master = cpu_dp->master;
1785 struct dsa_switch *ds = port->ds;
1786 const char *name = port->name;
1787 struct net_device *slave_dev;
1788 struct dsa_slave_priv *p;
1789 int ret;
1790
1791 if (!ds->num_tx_queues)
1792 ds->num_tx_queues = 1;
1793
1794 slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
1795 NET_NAME_UNKNOWN, ether_setup,
1796 ds->num_tx_queues, 1);
1797 if (slave_dev == NULL)
1798 return -ENOMEM;
1799
1800 slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1801 if (ds->ops->port_vlan_add && ds->ops->port_vlan_del)
1802 slave_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1803 slave_dev->hw_features |= NETIF_F_HW_TC;
1804 slave_dev->features |= NETIF_F_LLTX;
1805 slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1806 if (!IS_ERR_OR_NULL(port->mac))
1807 ether_addr_copy(slave_dev->dev_addr, port->mac);
1808 else
1809 eth_hw_addr_inherit(slave_dev, master);
1810 slave_dev->priv_flags |= IFF_NO_QUEUE;
1811 slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1812 if (ds->ops->port_max_mtu)
1813 slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
1814 if (cpu_dp->tag_ops->tail_tag)
1815 slave_dev->needed_tailroom = cpu_dp->tag_ops->overhead;
1816 else
1817 slave_dev->needed_headroom = cpu_dp->tag_ops->overhead;
1818 /* Try to save one extra realloc later in the TX path (in the master)
1819 * by also inheriting the master's needed headroom and tailroom.
1820 * The 8021q driver also does this.
1821 */
1822 slave_dev->needed_headroom += master->needed_headroom;
1823 slave_dev->needed_tailroom += master->needed_tailroom;
1824 SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1825
1826 netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1827 NULL);
1828
1829 SET_NETDEV_DEV(slave_dev, port->ds->dev);
1830 slave_dev->dev.of_node = port->dn;
1831 slave_dev->vlan_features = master->vlan_features;
1832
1833 p = netdev_priv(slave_dev);
1834 slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1835 if (!slave_dev->tstats) {
1836 free_netdev(slave_dev);
1837 return -ENOMEM;
1838 }
1839
1840 ret = gro_cells_init(&p->gcells, slave_dev);
1841 if (ret)
1842 goto out_free;
1843
1844 p->dp = port;
1845 INIT_LIST_HEAD(&p->mall_tc_list);
1846 p->xmit = cpu_dp->tag_ops->xmit;
1847 port->slave = slave_dev;
1848
1849 rtnl_lock();
1850 ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
1851 rtnl_unlock();
1852 if (ret && ret != -EOPNOTSUPP)
1853 dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
1854 ret, ETH_DATA_LEN, port->index);
1855
1856 netif_carrier_off(slave_dev);
1857
1858 ret = dsa_slave_phy_setup(slave_dev);
1859 if (ret) {
1860 netdev_err(slave_dev,
1861 "error %d setting up PHY for tree %d, switch %d, port %d\n",
1862 ret, ds->dst->index, ds->index, port->index);
1863 goto out_gcells;
1864 }
1865
1866 dsa_slave_notify(slave_dev, DSA_PORT_REGISTER);
1867
1868 rtnl_lock();
1869
1870 ret = register_netdevice(slave_dev);
1871 if (ret) {
1872 netdev_err(master, "error %d registering interface %s\n",
1873 ret, slave_dev->name);
1874 rtnl_unlock();
1875 goto out_phy;
1876 }
1877
1878 ret = netdev_upper_dev_link(master, slave_dev, NULL);
1879
1880 rtnl_unlock();
1881
1882 if (ret)
1883 goto out_unregister;
1884
1885 return 0;
1886
1887 out_unregister:
1888 unregister_netdev(slave_dev);
1889 out_phy:
1890 rtnl_lock();
1891 phylink_disconnect_phy(p->dp->pl);
1892 rtnl_unlock();
1893 phylink_destroy(p->dp->pl);
1894 out_gcells:
1895 gro_cells_destroy(&p->gcells);
1896 out_free:
1897 free_percpu(slave_dev->tstats);
1898 free_netdev(slave_dev);
1899 port->slave = NULL;
1900 return ret;
1901 }
1902
1903 void dsa_slave_destroy(struct net_device *slave_dev)
1904 {
1905 struct net_device *master = dsa_slave_to_master(slave_dev);
1906 struct dsa_port *dp = dsa_slave_to_port(slave_dev);
1907 struct dsa_slave_priv *p = netdev_priv(slave_dev);
1908
1909 netif_carrier_off(slave_dev);
1910 rtnl_lock();
1911 netdev_upper_dev_unlink(master, slave_dev);
1912 unregister_netdevice(slave_dev);
1913 phylink_disconnect_phy(dp->pl);
1914 rtnl_unlock();
1915
1916 dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
1917 phylink_destroy(dp->pl);
1918 gro_cells_destroy(&p->gcells);
1919 free_percpu(slave_dev->tstats);
1920 free_netdev(slave_dev);
1921 }
1922
1923 bool dsa_slave_dev_check(const struct net_device *dev)
1924 {
1925 return dev->netdev_ops == &dsa_slave_netdev_ops;
1926 }
1927
1928 static int dsa_slave_changeupper(struct net_device *dev,
1929 struct netdev_notifier_changeupper_info *info)
1930 {
1931 struct dsa_port *dp = dsa_slave_to_port(dev);
1932 int err = NOTIFY_DONE;
1933
1934 if (netif_is_bridge_master(info->upper_dev)) {
1935 if (info->linking) {
1936 err = dsa_port_bridge_join(dp, info->upper_dev);
1937 if (!err)
1938 dsa_bridge_mtu_normalization(dp);
1939 err = notifier_from_errno(err);
1940 } else {
1941 dsa_port_bridge_leave(dp, info->upper_dev);
1942 err = NOTIFY_OK;
1943 }
1944 }
1945
1946 return err;
1947 }
1948
1949 static int
1950 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
1951 struct netdev_notifier_changeupper_info *info)
1952 {
1953 struct netlink_ext_ack *ext_ack;
1954 struct net_device *slave;
1955 struct dsa_port *dp;
1956
1957 ext_ack = netdev_notifier_info_to_extack(&info->info);
1958
1959 if (!is_vlan_dev(dev))
1960 return NOTIFY_DONE;
1961
1962 slave = vlan_dev_real_dev(dev);
1963 if (!dsa_slave_dev_check(slave))
1964 return NOTIFY_DONE;
1965
1966 dp = dsa_slave_to_port(slave);
1967 if (!dp->bridge_dev)
1968 return NOTIFY_DONE;
1969
1970 /* Deny enslaving a VLAN device into a VLAN-aware bridge */
1971 if (br_vlan_enabled(dp->bridge_dev) &&
1972 netif_is_bridge_master(info->upper_dev) && info->linking) {
1973 NL_SET_ERR_MSG_MOD(ext_ack,
1974 "Cannot enslave VLAN device into VLAN aware bridge");
1975 return notifier_from_errno(-EINVAL);
1976 }
1977
1978 return NOTIFY_DONE;
1979 }
1980
1981 static int
1982 dsa_slave_check_8021q_upper(struct net_device *dev,
1983 struct netdev_notifier_changeupper_info *info)
1984 {
1985 struct dsa_port *dp = dsa_slave_to_port(dev);
1986 struct net_device *br = dp->bridge_dev;
1987 struct bridge_vlan_info br_info;
1988 struct netlink_ext_ack *extack;
1989 int err = NOTIFY_DONE;
1990 u16 vid;
1991
1992 if (!br || !br_vlan_enabled(br))
1993 return NOTIFY_DONE;
1994
1995 extack = netdev_notifier_info_to_extack(&info->info);
1996 vid = vlan_dev_vlan_id(info->upper_dev);
1997
1998 /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
1999 * device, respectively the VID is not found, returning
2000 * 0 means success, which is a failure for us here.
2001 */
2002 err = br_vlan_get_info(br, vid, &br_info);
2003 if (err == 0) {
2004 NL_SET_ERR_MSG_MOD(extack,
2005 "This VLAN is already configured by the bridge");
2006 return notifier_from_errno(-EBUSY);
2007 }
2008
2009 return NOTIFY_DONE;
2010 }
2011
2012 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2013 unsigned long event, void *ptr)
2014 {
2015 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2016
2017 switch (event) {
2018 case NETDEV_PRECHANGEUPPER: {
2019 struct netdev_notifier_changeupper_info *info = ptr;
2020 struct dsa_switch *ds;
2021 struct dsa_port *dp;
2022 int err;
2023
2024 if (!dsa_slave_dev_check(dev))
2025 return dsa_prevent_bridging_8021q_upper(dev, ptr);
2026
2027 dp = dsa_slave_to_port(dev);
2028 ds = dp->ds;
2029
2030 if (ds->ops->port_prechangeupper) {
2031 err = ds->ops->port_prechangeupper(ds, dp->index, info);
2032 if (err)
2033 return notifier_from_errno(err);
2034 }
2035
2036 if (is_vlan_dev(info->upper_dev))
2037 return dsa_slave_check_8021q_upper(dev, ptr);
2038 break;
2039 }
2040 case NETDEV_CHANGEUPPER:
2041 if (!dsa_slave_dev_check(dev))
2042 return NOTIFY_DONE;
2043
2044 return dsa_slave_changeupper(dev, ptr);
2045 }
2046
2047 return NOTIFY_DONE;
2048 }
2049
2050 struct dsa_switchdev_event_work {
2051 struct work_struct work;
2052 struct switchdev_notifier_fdb_info fdb_info;
2053 struct net_device *dev;
2054 unsigned long event;
2055 };
2056
2057 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2058 {
2059 struct dsa_switchdev_event_work *switchdev_work =
2060 container_of(work, struct dsa_switchdev_event_work, work);
2061 struct net_device *dev = switchdev_work->dev;
2062 struct switchdev_notifier_fdb_info *fdb_info;
2063 struct dsa_port *dp = dsa_slave_to_port(dev);
2064 int err;
2065
2066 rtnl_lock();
2067 switch (switchdev_work->event) {
2068 case SWITCHDEV_FDB_ADD_TO_DEVICE:
2069 fdb_info = &switchdev_work->fdb_info;
2070 if (!fdb_info->added_by_user)
2071 break;
2072
2073 err = dsa_port_fdb_add(dp, fdb_info->addr, fdb_info->vid);
2074 if (err) {
2075 netdev_dbg(dev, "fdb add failed err=%d\n", err);
2076 break;
2077 }
2078 fdb_info->offloaded = true;
2079 call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED, dev,
2080 &fdb_info->info, NULL);
2081 break;
2082
2083 case SWITCHDEV_FDB_DEL_TO_DEVICE:
2084 fdb_info = &switchdev_work->fdb_info;
2085 if (!fdb_info->added_by_user)
2086 break;
2087
2088 err = dsa_port_fdb_del(dp, fdb_info->addr, fdb_info->vid);
2089 if (err) {
2090 netdev_dbg(dev, "fdb del failed err=%d\n", err);
2091 dev_close(dev);
2092 }
2093 break;
2094 }
2095 rtnl_unlock();
2096
2097 kfree(switchdev_work->fdb_info.addr);
2098 kfree(switchdev_work);
2099 dev_put(dev);
2100 }
2101
2102 static int
2103 dsa_slave_switchdev_fdb_work_init(struct dsa_switchdev_event_work *
2104 switchdev_work,
2105 const struct switchdev_notifier_fdb_info *
2106 fdb_info)
2107 {
2108 memcpy(&switchdev_work->fdb_info, fdb_info,
2109 sizeof(switchdev_work->fdb_info));
2110 switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
2111 if (!switchdev_work->fdb_info.addr)
2112 return -ENOMEM;
2113 ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
2114 fdb_info->addr);
2115 return 0;
2116 }
2117
2118 /* Called under rcu_read_lock() */
2119 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2120 unsigned long event, void *ptr)
2121 {
2122 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2123 struct dsa_switchdev_event_work *switchdev_work;
2124 int err;
2125
2126 if (event == SWITCHDEV_PORT_ATTR_SET) {
2127 err = switchdev_handle_port_attr_set(dev, ptr,
2128 dsa_slave_dev_check,
2129 dsa_slave_port_attr_set);
2130 return notifier_from_errno(err);
2131 }
2132
2133 if (!dsa_slave_dev_check(dev))
2134 return NOTIFY_DONE;
2135
2136 switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2137 if (!switchdev_work)
2138 return NOTIFY_BAD;
2139
2140 INIT_WORK(&switchdev_work->work,
2141 dsa_slave_switchdev_event_work);
2142 switchdev_work->dev = dev;
2143 switchdev_work->event = event;
2144
2145 switch (event) {
2146 case SWITCHDEV_FDB_ADD_TO_DEVICE:
2147 case SWITCHDEV_FDB_DEL_TO_DEVICE:
2148 if (dsa_slave_switchdev_fdb_work_init(switchdev_work, ptr))
2149 goto err_fdb_work_init;
2150 dev_hold(dev);
2151 break;
2152 default:
2153 kfree(switchdev_work);
2154 return NOTIFY_DONE;
2155 }
2156
2157 dsa_schedule_work(&switchdev_work->work);
2158 return NOTIFY_OK;
2159
2160 err_fdb_work_init:
2161 kfree(switchdev_work);
2162 return NOTIFY_BAD;
2163 }
2164
2165 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2166 unsigned long event, void *ptr)
2167 {
2168 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2169 int err;
2170
2171 switch (event) {
2172 case SWITCHDEV_PORT_OBJ_ADD:
2173 err = switchdev_handle_port_obj_add(dev, ptr,
2174 dsa_slave_dev_check,
2175 dsa_slave_port_obj_add);
2176 return notifier_from_errno(err);
2177 case SWITCHDEV_PORT_OBJ_DEL:
2178 err = switchdev_handle_port_obj_del(dev, ptr,
2179 dsa_slave_dev_check,
2180 dsa_slave_port_obj_del);
2181 return notifier_from_errno(err);
2182 case SWITCHDEV_PORT_ATTR_SET:
2183 err = switchdev_handle_port_attr_set(dev, ptr,
2184 dsa_slave_dev_check,
2185 dsa_slave_port_attr_set);
2186 return notifier_from_errno(err);
2187 }
2188
2189 return NOTIFY_DONE;
2190 }
2191
2192 static struct notifier_block dsa_slave_nb __read_mostly = {
2193 .notifier_call = dsa_slave_netdevice_event,
2194 };
2195
2196 static struct notifier_block dsa_slave_switchdev_notifier = {
2197 .notifier_call = dsa_slave_switchdev_event,
2198 };
2199
2200 static struct notifier_block dsa_slave_switchdev_blocking_notifier = {
2201 .notifier_call = dsa_slave_switchdev_blocking_event,
2202 };
2203
2204 int dsa_slave_register_notifier(void)
2205 {
2206 struct notifier_block *nb;
2207 int err;
2208
2209 err = register_netdevice_notifier(&dsa_slave_nb);
2210 if (err)
2211 return err;
2212
2213 err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
2214 if (err)
2215 goto err_switchdev_nb;
2216
2217 nb = &dsa_slave_switchdev_blocking_notifier;
2218 err = register_switchdev_blocking_notifier(nb);
2219 if (err)
2220 goto err_switchdev_blocking_nb;
2221
2222 return 0;
2223
2224 err_switchdev_blocking_nb:
2225 unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2226 err_switchdev_nb:
2227 unregister_netdevice_notifier(&dsa_slave_nb);
2228 return err;
2229 }
2230
2231 void dsa_slave_unregister_notifier(void)
2232 {
2233 struct notifier_block *nb;
2234 int err;
2235
2236 nb = &dsa_slave_switchdev_blocking_notifier;
2237 err = unregister_switchdev_blocking_notifier(nb);
2238 if (err)
2239 pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
2240
2241 err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
2242 if (err)
2243 pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
2244
2245 err = unregister_netdevice_notifier(&dsa_slave_nb);
2246 if (err)
2247 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
2248 }
Linux with added FPC-III support