1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /* Copyright (c) 2019-2021 Marvell International Ltd. All rights reserved */
4 #include <linux/kernel.h>
5 #include <linux/types.h>
6 #include <linux/inetdevice.h>
7 #include <net/switchdev.h>
8 #include <linux/rhashtable.h>
11 #include "prestera_router_hw.h"
13 struct prestera_kern_fib_cache_key {
14 struct prestera_ip_addr addr;
16 u32 kern_tb_id; /* tb_id from kernel (not fixed) */
19 /* Subscribing on neighbours in kernel */
20 struct prestera_kern_fib_cache {
21 struct prestera_kern_fib_cache_key key;
23 struct prestera_fib_key fib_key;
24 enum prestera_fib_type fib_type;
25 } lpm_info; /* hold prepared lpm info */
26 /* Indicate if route is not overlapped by another table */
27 struct rhash_head ht_node; /* node of prestera_router */
34 static const struct rhashtable_params __prestera_kern_fib_cache_ht_params = {
35 .key_offset = offsetof(struct prestera_kern_fib_cache, key),
36 .head_offset = offsetof(struct prestera_kern_fib_cache, ht_node),
37 .key_len = sizeof(struct prestera_kern_fib_cache_key),
38 .automatic_shrinking = true,
41 /* This util to be used, to convert kernel rules for default vr in hw_vr */
42 static u32 prestera_fix_tb_id(u32 tb_id)
44 if (tb_id == RT_TABLE_UNSPEC ||
45 tb_id == RT_TABLE_LOCAL ||
46 tb_id == RT_TABLE_DEFAULT)
47 tb_id = RT_TABLE_MAIN;
53 prestera_util_fen_info2fib_cache_key(struct fib_entry_notifier_info *fen_info,
54 struct prestera_kern_fib_cache_key *key)
56 memset(key, 0, sizeof(*key));
57 key->addr.u.ipv4 = cpu_to_be32(fen_info->dst);
58 key->prefix_len = fen_info->dst_len;
59 key->kern_tb_id = fen_info->tb_id;
62 static struct prestera_kern_fib_cache *
63 prestera_kern_fib_cache_find(struct prestera_switch *sw,
64 struct prestera_kern_fib_cache_key *key)
66 struct prestera_kern_fib_cache *fib_cache;
69 rhashtable_lookup_fast(&sw->router->kern_fib_cache_ht, key,
70 __prestera_kern_fib_cache_ht_params);
75 prestera_kern_fib_cache_destroy(struct prestera_switch *sw,
76 struct prestera_kern_fib_cache *fib_cache)
78 fib_info_put(fib_cache->fi);
79 rhashtable_remove_fast(&sw->router->kern_fib_cache_ht,
81 __prestera_kern_fib_cache_ht_params);
85 /* Operations on fi (offload, etc) must be wrapped in utils.
86 * This function just create storage.
88 static struct prestera_kern_fib_cache *
89 prestera_kern_fib_cache_create(struct prestera_switch *sw,
90 struct prestera_kern_fib_cache_key *key,
91 struct fib_info *fi, u8 tos, u8 type)
93 struct prestera_kern_fib_cache *fib_cache;
96 fib_cache = kzalloc(sizeof(*fib_cache), GFP_KERNEL);
100 memcpy(&fib_cache->key, key, sizeof(*key));
103 fib_cache->kern_tos = tos;
104 fib_cache->kern_type = type;
106 err = rhashtable_insert_fast(&sw->router->kern_fib_cache_ht,
108 __prestera_kern_fib_cache_ht_params);
122 __prestera_k_arb_fib_lpm_offload_set(struct prestera_switch *sw,
123 struct prestera_kern_fib_cache *fc,
124 bool fail, bool offload, bool trap)
126 struct fib_rt_info fri;
128 if (fc->key.addr.v != PRESTERA_IPV4)
132 fri.tb_id = fc->key.kern_tb_id;
133 fri.dst = fc->key.addr.u.ipv4;
134 fri.dst_len = fc->key.prefix_len;
135 fri.tos = fc->kern_tos;
136 fri.type = fc->kern_type;
138 fri.offload = offload;
140 fri.offload_failed = fail;
142 fib_alias_hw_flags_set(&init_net, &fri);
146 __prestera_pr_k_arb_fc_lpm_info_calc(struct prestera_switch *sw,
147 struct prestera_kern_fib_cache *fc)
149 memset(&fc->lpm_info, 0, sizeof(fc->lpm_info));
151 switch (fc->fi->fib_type) {
153 fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_TRAP;
155 /* Unsupported. Leave it for kernel: */
158 /* Routes we must trap by design: */
160 case RTN_UNREACHABLE:
162 fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_TRAP;
165 fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_DROP;
168 dev_err(sw->dev->dev, "Unsupported fib_type");
172 fc->lpm_info.fib_key.addr = fc->key.addr;
173 fc->lpm_info.fib_key.prefix_len = fc->key.prefix_len;
174 fc->lpm_info.fib_key.tb_id = prestera_fix_tb_id(fc->key.kern_tb_id);
179 static int __prestera_k_arb_f_lpm_set(struct prestera_switch *sw,
180 struct prestera_kern_fib_cache *fc,
183 struct prestera_fib_node *fib_node;
185 fib_node = prestera_fib_node_find(sw, &fc->lpm_info.fib_key);
187 prestera_fib_node_destroy(sw, fib_node);
192 fib_node = prestera_fib_node_create(sw, &fc->lpm_info.fib_key,
193 fc->lpm_info.fib_type);
196 dev_err(sw->dev->dev, "fib_node=NULL %pI4n/%d kern_tb_id = %d",
197 &fc->key.addr.u.ipv4, fc->key.prefix_len,
205 static int __prestera_k_arb_fc_apply(struct prestera_switch *sw,
206 struct prestera_kern_fib_cache *fc)
210 err = __prestera_pr_k_arb_fc_lpm_info_calc(sw, fc);
214 err = __prestera_k_arb_f_lpm_set(sw, fc, fc->reachable);
216 __prestera_k_arb_fib_lpm_offload_set(sw, fc,
221 switch (fc->lpm_info.fib_type) {
222 case PRESTERA_FIB_TYPE_TRAP:
223 __prestera_k_arb_fib_lpm_offload_set(sw, fc, false,
224 false, fc->reachable);
226 case PRESTERA_FIB_TYPE_DROP:
227 __prestera_k_arb_fib_lpm_offload_set(sw, fc, false, true,
230 case PRESTERA_FIB_TYPE_INVALID:
237 static struct prestera_kern_fib_cache *
238 __prestera_k_arb_util_fib_overlaps(struct prestera_switch *sw,
239 struct prestera_kern_fib_cache *fc)
241 struct prestera_kern_fib_cache_key fc_key;
242 struct prestera_kern_fib_cache *rfc;
244 /* TODO: parse kernel rules */
246 if (fc->key.kern_tb_id == RT_TABLE_LOCAL) {
247 memcpy(&fc_key, &fc->key, sizeof(fc_key));
248 fc_key.kern_tb_id = RT_TABLE_MAIN;
249 rfc = prestera_kern_fib_cache_find(sw, &fc_key);
255 static struct prestera_kern_fib_cache *
256 __prestera_k_arb_util_fib_overlapped(struct prestera_switch *sw,
257 struct prestera_kern_fib_cache *fc)
259 struct prestera_kern_fib_cache_key fc_key;
260 struct prestera_kern_fib_cache *rfc;
262 /* TODO: parse kernel rules */
264 if (fc->key.kern_tb_id == RT_TABLE_MAIN) {
265 memcpy(&fc_key, &fc->key, sizeof(fc_key));
266 fc_key.kern_tb_id = RT_TABLE_LOCAL;
267 rfc = prestera_kern_fib_cache_find(sw, &fc_key);
274 prestera_k_arb_fib_evt(struct prestera_switch *sw,
275 bool replace, /* replace or del */
276 struct fib_entry_notifier_info *fen_info)
278 struct prestera_kern_fib_cache *tfib_cache, *bfib_cache; /* top/btm */
279 struct prestera_kern_fib_cache_key fc_key;
280 struct prestera_kern_fib_cache *fib_cache;
283 prestera_util_fen_info2fib_cache_key(fen_info, &fc_key);
284 fib_cache = prestera_kern_fib_cache_find(sw, &fc_key);
286 fib_cache->reachable = false;
287 err = __prestera_k_arb_fc_apply(sw, fib_cache);
289 dev_err(sw->dev->dev,
290 "Applying destroyed fib_cache failed");
292 bfib_cache = __prestera_k_arb_util_fib_overlaps(sw, fib_cache);
293 tfib_cache = __prestera_k_arb_util_fib_overlapped(sw, fib_cache);
294 if (!tfib_cache && bfib_cache) {
295 bfib_cache->reachable = true;
296 err = __prestera_k_arb_fc_apply(sw, bfib_cache);
298 dev_err(sw->dev->dev,
299 "Applying fib_cache btm failed");
302 prestera_kern_fib_cache_destroy(sw, fib_cache);
306 fib_cache = prestera_kern_fib_cache_create(sw, &fc_key,
311 dev_err(sw->dev->dev, "fib_cache == NULL");
315 bfib_cache = __prestera_k_arb_util_fib_overlaps(sw, fib_cache);
316 tfib_cache = __prestera_k_arb_util_fib_overlapped(sw, fib_cache);
318 fib_cache->reachable = true;
321 bfib_cache->reachable = false;
322 err = __prestera_k_arb_fc_apply(sw, bfib_cache);
324 dev_err(sw->dev->dev,
325 "Applying fib_cache btm failed");
328 err = __prestera_k_arb_fc_apply(sw, fib_cache);
330 dev_err(sw->dev->dev, "Applying fib_cache failed");
336 static int __prestera_inetaddr_port_event(struct net_device *port_dev,
338 struct netlink_ext_ack *extack)
340 struct prestera_port *port = netdev_priv(port_dev);
341 struct prestera_rif_entry_key re_key = {};
342 struct prestera_rif_entry *re;
346 err = prestera_is_valid_mac_addr(port, port_dev->dev_addr);
348 NL_SET_ERR_MSG_MOD(extack, "RIF MAC must have the same prefix");
352 kern_tb_id = l3mdev_fib_table(port_dev);
353 re_key.iface.type = PRESTERA_IF_PORT_E;
354 re_key.iface.dev_port.hw_dev_num = port->dev_id;
355 re_key.iface.dev_port.port_num = port->hw_id;
356 re = prestera_rif_entry_find(port->sw, &re_key);
361 NL_SET_ERR_MSG_MOD(extack, "RIF already exist");
364 re = prestera_rif_entry_create(port->sw, &re_key,
365 prestera_fix_tb_id(kern_tb_id),
368 NL_SET_ERR_MSG_MOD(extack, "Can't create RIF");
375 NL_SET_ERR_MSG_MOD(extack, "Can't find RIF");
378 prestera_rif_entry_destroy(port->sw, re);
386 static int __prestera_inetaddr_event(struct prestera_switch *sw,
387 struct net_device *dev,
389 struct netlink_ext_ack *extack)
391 if (!prestera_netdev_check(dev) || netif_is_bridge_port(dev) ||
392 netif_is_lag_port(dev) || netif_is_ovs_port(dev))
395 return __prestera_inetaddr_port_event(dev, event, extack);
398 static int __prestera_inetaddr_cb(struct notifier_block *nb,
399 unsigned long event, void *ptr)
401 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
402 struct net_device *dev = ifa->ifa_dev->dev;
403 struct prestera_router *router = container_of(nb,
404 struct prestera_router,
406 struct in_device *idev;
409 if (event != NETDEV_DOWN)
412 /* Ignore if this is not latest address */
413 idev = __in_dev_get_rtnl(dev);
414 if (idev && idev->ifa_list)
417 err = __prestera_inetaddr_event(router->sw, dev, event, NULL);
419 return notifier_from_errno(err);
422 static int __prestera_inetaddr_valid_cb(struct notifier_block *nb,
423 unsigned long event, void *ptr)
425 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
426 struct net_device *dev = ivi->ivi_dev->dev;
427 struct prestera_router *router = container_of(nb,
428 struct prestera_router,
430 struct in_device *idev;
433 if (event != NETDEV_UP)
436 /* Ignore if this is not first address */
437 idev = __in_dev_get_rtnl(dev);
438 if (idev && idev->ifa_list)
441 if (ipv4_is_multicast(ivi->ivi_addr)) {
442 NL_SET_ERR_MSG_MOD(ivi->extack,
443 "Multicast addr on RIF is not supported");
448 err = __prestera_inetaddr_event(router->sw, dev, event, ivi->extack);
450 return notifier_from_errno(err);
453 struct prestera_fib_event_work {
454 struct work_struct work;
455 struct prestera_switch *sw;
456 struct fib_entry_notifier_info fen_info;
460 static void __prestera_router_fib_event_work(struct work_struct *work)
462 struct prestera_fib_event_work *fib_work =
463 container_of(work, struct prestera_fib_event_work, work);
464 struct prestera_switch *sw = fib_work->sw;
469 switch (fib_work->event) {
470 case FIB_EVENT_ENTRY_REPLACE:
471 err = prestera_k_arb_fib_evt(sw, true, &fib_work->fen_info);
476 case FIB_EVENT_ENTRY_DEL:
477 err = prestera_k_arb_fib_evt(sw, false, &fib_work->fen_info);
487 dev_err(sw->dev->dev, "Error when processing %pI4h/%d",
488 &fib_work->fen_info.dst,
489 fib_work->fen_info.dst_len);
491 fib_info_put(fib_work->fen_info.fi);
496 /* Called with rcu_read_lock() */
497 static int __prestera_router_fib_event(struct notifier_block *nb,
498 unsigned long event, void *ptr)
500 struct prestera_fib_event_work *fib_work;
501 struct fib_entry_notifier_info *fen_info;
502 struct fib_notifier_info *info = ptr;
503 struct prestera_router *router;
505 if (info->family != AF_INET)
508 router = container_of(nb, struct prestera_router, fib_nb);
511 case FIB_EVENT_ENTRY_REPLACE:
512 case FIB_EVENT_ENTRY_DEL:
513 fen_info = container_of(info, struct fib_entry_notifier_info,
518 fib_work = kzalloc(sizeof(*fib_work), GFP_ATOMIC);
519 if (WARN_ON(!fib_work))
522 fib_info_hold(fen_info->fi);
523 fib_work->fen_info = *fen_info;
524 fib_work->event = event;
525 fib_work->sw = router->sw;
526 INIT_WORK(&fib_work->work, __prestera_router_fib_event_work);
527 prestera_queue_work(&fib_work->work);
536 int prestera_router_init(struct prestera_switch *sw)
538 struct prestera_router *router;
541 router = kzalloc(sizeof(*sw->router), GFP_KERNEL);
548 err = prestera_router_hw_init(sw);
550 goto err_router_lib_init;
552 err = rhashtable_init(&router->kern_fib_cache_ht,
553 &__prestera_kern_fib_cache_ht_params);
555 goto err_kern_fib_cache_ht_init;
557 router->inetaddr_valid_nb.notifier_call = __prestera_inetaddr_valid_cb;
558 err = register_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
560 goto err_register_inetaddr_validator_notifier;
562 router->inetaddr_nb.notifier_call = __prestera_inetaddr_cb;
563 err = register_inetaddr_notifier(&router->inetaddr_nb);
565 goto err_register_inetaddr_notifier;
567 router->fib_nb.notifier_call = __prestera_router_fib_event;
568 err = register_fib_notifier(&init_net, &router->fib_nb,
569 /* TODO: flush fib entries */ NULL, NULL);
571 goto err_register_fib_notifier;
575 err_register_fib_notifier:
576 unregister_inetaddr_notifier(&router->inetaddr_nb);
577 err_register_inetaddr_notifier:
578 unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
579 err_register_inetaddr_validator_notifier:
580 rhashtable_destroy(&router->kern_fib_cache_ht);
581 err_kern_fib_cache_ht_init:
582 prestera_router_hw_fini(sw);
588 void prestera_router_fini(struct prestera_switch *sw)
590 unregister_inetaddr_notifier(&sw->router->inetaddr_nb);
591 unregister_inetaddr_validator_notifier(&sw->router->inetaddr_valid_nb);
592 rhashtable_destroy(&sw->router->kern_fib_cache_ht);
593 prestera_router_hw_fini(sw);