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/inet_dscp.h>
8 #include <net/switchdev.h>
9 #include <linux/rhashtable.h>
12 #include "prestera_router_hw.h"
14 struct prestera_kern_fib_cache_key {
15 struct prestera_ip_addr addr;
17 u32 kern_tb_id; /* tb_id from kernel (not fixed) */
20 /* Subscribing on neighbours in kernel */
21 struct prestera_kern_fib_cache {
22 struct prestera_kern_fib_cache_key key;
24 struct prestera_fib_key fib_key;
25 enum prestera_fib_type fib_type;
26 } lpm_info; /* hold prepared lpm info */
27 /* Indicate if route is not overlapped by another table */
28 struct rhash_head ht_node; /* node of prestera_router */
35 static const struct rhashtable_params __prestera_kern_fib_cache_ht_params = {
36 .key_offset = offsetof(struct prestera_kern_fib_cache, key),
37 .head_offset = offsetof(struct prestera_kern_fib_cache, ht_node),
38 .key_len = sizeof(struct prestera_kern_fib_cache_key),
39 .automatic_shrinking = true,
42 /* This util to be used, to convert kernel rules for default vr in hw_vr */
43 static u32 prestera_fix_tb_id(u32 tb_id)
45 if (tb_id == RT_TABLE_UNSPEC ||
46 tb_id == RT_TABLE_LOCAL ||
47 tb_id == RT_TABLE_DEFAULT)
48 tb_id = RT_TABLE_MAIN;
54 prestera_util_fen_info2fib_cache_key(struct fib_entry_notifier_info *fen_info,
55 struct prestera_kern_fib_cache_key *key)
57 memset(key, 0, sizeof(*key));
58 key->addr.u.ipv4 = cpu_to_be32(fen_info->dst);
59 key->prefix_len = fen_info->dst_len;
60 key->kern_tb_id = fen_info->tb_id;
63 static struct prestera_kern_fib_cache *
64 prestera_kern_fib_cache_find(struct prestera_switch *sw,
65 struct prestera_kern_fib_cache_key *key)
67 struct prestera_kern_fib_cache *fib_cache;
70 rhashtable_lookup_fast(&sw->router->kern_fib_cache_ht, key,
71 __prestera_kern_fib_cache_ht_params);
76 prestera_kern_fib_cache_destroy(struct prestera_switch *sw,
77 struct prestera_kern_fib_cache *fib_cache)
79 fib_info_put(fib_cache->fi);
80 rhashtable_remove_fast(&sw->router->kern_fib_cache_ht,
82 __prestera_kern_fib_cache_ht_params);
86 /* Operations on fi (offload, etc) must be wrapped in utils.
87 * This function just create storage.
89 static struct prestera_kern_fib_cache *
90 prestera_kern_fib_cache_create(struct prestera_switch *sw,
91 struct prestera_kern_fib_cache_key *key,
92 struct fib_info *fi, dscp_t dscp, u8 type)
94 struct prestera_kern_fib_cache *fib_cache;
97 fib_cache = kzalloc(sizeof(*fib_cache), GFP_KERNEL);
101 memcpy(&fib_cache->key, key, sizeof(*key));
104 fib_cache->kern_dscp = dscp;
105 fib_cache->kern_type = type;
107 err = rhashtable_insert_fast(&sw->router->kern_fib_cache_ht,
109 __prestera_kern_fib_cache_ht_params);
123 __prestera_k_arb_fib_lpm_offload_set(struct prestera_switch *sw,
124 struct prestera_kern_fib_cache *fc,
125 bool fail, bool offload, bool trap)
127 struct fib_rt_info fri;
129 if (fc->key.addr.v != PRESTERA_IPV4)
133 fri.tb_id = fc->key.kern_tb_id;
134 fri.dst = fc->key.addr.u.ipv4;
135 fri.dst_len = fc->key.prefix_len;
136 fri.dscp = fc->kern_dscp;
137 fri.type = fc->kern_type;
139 fri.offload = offload;
141 fri.offload_failed = fail;
143 fib_alias_hw_flags_set(&init_net, &fri);
147 __prestera_pr_k_arb_fc_lpm_info_calc(struct prestera_switch *sw,
148 struct prestera_kern_fib_cache *fc)
150 memset(&fc->lpm_info, 0, sizeof(fc->lpm_info));
152 switch (fc->fi->fib_type) {
154 fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_TRAP;
156 /* Unsupported. Leave it for kernel: */
159 /* Routes we must trap by design: */
161 case RTN_UNREACHABLE:
163 fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_TRAP;
166 fc->lpm_info.fib_type = PRESTERA_FIB_TYPE_DROP;
169 dev_err(sw->dev->dev, "Unsupported fib_type");
173 fc->lpm_info.fib_key.addr = fc->key.addr;
174 fc->lpm_info.fib_key.prefix_len = fc->key.prefix_len;
175 fc->lpm_info.fib_key.tb_id = prestera_fix_tb_id(fc->key.kern_tb_id);
180 static int __prestera_k_arb_f_lpm_set(struct prestera_switch *sw,
181 struct prestera_kern_fib_cache *fc,
184 struct prestera_fib_node *fib_node;
186 fib_node = prestera_fib_node_find(sw, &fc->lpm_info.fib_key);
188 prestera_fib_node_destroy(sw, fib_node);
193 fib_node = prestera_fib_node_create(sw, &fc->lpm_info.fib_key,
194 fc->lpm_info.fib_type);
197 dev_err(sw->dev->dev, "fib_node=NULL %pI4n/%d kern_tb_id = %d",
198 &fc->key.addr.u.ipv4, fc->key.prefix_len,
206 static int __prestera_k_arb_fc_apply(struct prestera_switch *sw,
207 struct prestera_kern_fib_cache *fc)
211 err = __prestera_pr_k_arb_fc_lpm_info_calc(sw, fc);
215 err = __prestera_k_arb_f_lpm_set(sw, fc, fc->reachable);
217 __prestera_k_arb_fib_lpm_offload_set(sw, fc,
222 switch (fc->lpm_info.fib_type) {
223 case PRESTERA_FIB_TYPE_TRAP:
224 __prestera_k_arb_fib_lpm_offload_set(sw, fc, false,
225 false, fc->reachable);
227 case PRESTERA_FIB_TYPE_DROP:
228 __prestera_k_arb_fib_lpm_offload_set(sw, fc, false, true,
231 case PRESTERA_FIB_TYPE_INVALID:
238 static struct prestera_kern_fib_cache *
239 __prestera_k_arb_util_fib_overlaps(struct prestera_switch *sw,
240 struct prestera_kern_fib_cache *fc)
242 struct prestera_kern_fib_cache_key fc_key;
243 struct prestera_kern_fib_cache *rfc;
245 /* TODO: parse kernel rules */
247 if (fc->key.kern_tb_id == RT_TABLE_LOCAL) {
248 memcpy(&fc_key, &fc->key, sizeof(fc_key));
249 fc_key.kern_tb_id = RT_TABLE_MAIN;
250 rfc = prestera_kern_fib_cache_find(sw, &fc_key);
256 static struct prestera_kern_fib_cache *
257 __prestera_k_arb_util_fib_overlapped(struct prestera_switch *sw,
258 struct prestera_kern_fib_cache *fc)
260 struct prestera_kern_fib_cache_key fc_key;
261 struct prestera_kern_fib_cache *rfc;
263 /* TODO: parse kernel rules */
265 if (fc->key.kern_tb_id == RT_TABLE_MAIN) {
266 memcpy(&fc_key, &fc->key, sizeof(fc_key));
267 fc_key.kern_tb_id = RT_TABLE_LOCAL;
268 rfc = prestera_kern_fib_cache_find(sw, &fc_key);
275 prestera_k_arb_fib_evt(struct prestera_switch *sw,
276 bool replace, /* replace or del */
277 struct fib_entry_notifier_info *fen_info)
279 struct prestera_kern_fib_cache *tfib_cache, *bfib_cache; /* top/btm */
280 struct prestera_kern_fib_cache_key fc_key;
281 struct prestera_kern_fib_cache *fib_cache;
284 prestera_util_fen_info2fib_cache_key(fen_info, &fc_key);
285 fib_cache = prestera_kern_fib_cache_find(sw, &fc_key);
287 fib_cache->reachable = false;
288 err = __prestera_k_arb_fc_apply(sw, fib_cache);
290 dev_err(sw->dev->dev,
291 "Applying destroyed fib_cache failed");
293 bfib_cache = __prestera_k_arb_util_fib_overlaps(sw, fib_cache);
294 tfib_cache = __prestera_k_arb_util_fib_overlapped(sw, fib_cache);
295 if (!tfib_cache && bfib_cache) {
296 bfib_cache->reachable = true;
297 err = __prestera_k_arb_fc_apply(sw, bfib_cache);
299 dev_err(sw->dev->dev,
300 "Applying fib_cache btm failed");
303 prestera_kern_fib_cache_destroy(sw, fib_cache);
307 fib_cache = prestera_kern_fib_cache_create(sw, &fc_key,
312 dev_err(sw->dev->dev, "fib_cache == NULL");
316 bfib_cache = __prestera_k_arb_util_fib_overlaps(sw, fib_cache);
317 tfib_cache = __prestera_k_arb_util_fib_overlapped(sw, fib_cache);
319 fib_cache->reachable = true;
322 bfib_cache->reachable = false;
323 err = __prestera_k_arb_fc_apply(sw, bfib_cache);
325 dev_err(sw->dev->dev,
326 "Applying fib_cache btm failed");
329 err = __prestera_k_arb_fc_apply(sw, fib_cache);
331 dev_err(sw->dev->dev, "Applying fib_cache failed");
337 static int __prestera_inetaddr_port_event(struct net_device *port_dev,
339 struct netlink_ext_ack *extack)
341 struct prestera_port *port = netdev_priv(port_dev);
342 struct prestera_rif_entry_key re_key = {};
343 struct prestera_rif_entry *re;
347 err = prestera_is_valid_mac_addr(port, port_dev->dev_addr);
349 NL_SET_ERR_MSG_MOD(extack, "RIF MAC must have the same prefix");
353 kern_tb_id = l3mdev_fib_table(port_dev);
354 re_key.iface.type = PRESTERA_IF_PORT_E;
355 re_key.iface.dev_port.hw_dev_num = port->dev_id;
356 re_key.iface.dev_port.port_num = port->hw_id;
357 re = prestera_rif_entry_find(port->sw, &re_key);
362 NL_SET_ERR_MSG_MOD(extack, "RIF already exist");
365 re = prestera_rif_entry_create(port->sw, &re_key,
366 prestera_fix_tb_id(kern_tb_id),
369 NL_SET_ERR_MSG_MOD(extack, "Can't create RIF");
376 NL_SET_ERR_MSG_MOD(extack, "Can't find RIF");
379 prestera_rif_entry_destroy(port->sw, re);
387 static int __prestera_inetaddr_event(struct prestera_switch *sw,
388 struct net_device *dev,
390 struct netlink_ext_ack *extack)
392 if (!prestera_netdev_check(dev) || netif_is_bridge_port(dev) ||
393 netif_is_lag_port(dev) || netif_is_ovs_port(dev))
396 return __prestera_inetaddr_port_event(dev, event, extack);
399 static int __prestera_inetaddr_cb(struct notifier_block *nb,
400 unsigned long event, void *ptr)
402 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
403 struct net_device *dev = ifa->ifa_dev->dev;
404 struct prestera_router *router = container_of(nb,
405 struct prestera_router,
407 struct in_device *idev;
410 if (event != NETDEV_DOWN)
413 /* Ignore if this is not latest address */
414 idev = __in_dev_get_rtnl(dev);
415 if (idev && idev->ifa_list)
418 err = __prestera_inetaddr_event(router->sw, dev, event, NULL);
420 return notifier_from_errno(err);
423 static int __prestera_inetaddr_valid_cb(struct notifier_block *nb,
424 unsigned long event, void *ptr)
426 struct in_validator_info *ivi = (struct in_validator_info *)ptr;
427 struct net_device *dev = ivi->ivi_dev->dev;
428 struct prestera_router *router = container_of(nb,
429 struct prestera_router,
431 struct in_device *idev;
434 if (event != NETDEV_UP)
437 /* Ignore if this is not first address */
438 idev = __in_dev_get_rtnl(dev);
439 if (idev && idev->ifa_list)
442 if (ipv4_is_multicast(ivi->ivi_addr)) {
443 NL_SET_ERR_MSG_MOD(ivi->extack,
444 "Multicast addr on RIF is not supported");
449 err = __prestera_inetaddr_event(router->sw, dev, event, ivi->extack);
451 return notifier_from_errno(err);
454 struct prestera_fib_event_work {
455 struct work_struct work;
456 struct prestera_switch *sw;
457 struct fib_entry_notifier_info fen_info;
461 static void __prestera_router_fib_event_work(struct work_struct *work)
463 struct prestera_fib_event_work *fib_work =
464 container_of(work, struct prestera_fib_event_work, work);
465 struct prestera_switch *sw = fib_work->sw;
470 switch (fib_work->event) {
471 case FIB_EVENT_ENTRY_REPLACE:
472 err = prestera_k_arb_fib_evt(sw, true, &fib_work->fen_info);
477 case FIB_EVENT_ENTRY_DEL:
478 err = prestera_k_arb_fib_evt(sw, false, &fib_work->fen_info);
488 dev_err(sw->dev->dev, "Error when processing %pI4h/%d",
489 &fib_work->fen_info.dst,
490 fib_work->fen_info.dst_len);
492 fib_info_put(fib_work->fen_info.fi);
497 /* Called with rcu_read_lock() */
498 static int __prestera_router_fib_event(struct notifier_block *nb,
499 unsigned long event, void *ptr)
501 struct prestera_fib_event_work *fib_work;
502 struct fib_entry_notifier_info *fen_info;
503 struct fib_notifier_info *info = ptr;
504 struct prestera_router *router;
506 if (info->family != AF_INET)
509 router = container_of(nb, struct prestera_router, fib_nb);
512 case FIB_EVENT_ENTRY_REPLACE:
513 case FIB_EVENT_ENTRY_DEL:
514 fen_info = container_of(info, struct fib_entry_notifier_info,
519 fib_work = kzalloc(sizeof(*fib_work), GFP_ATOMIC);
520 if (WARN_ON(!fib_work))
523 fib_info_hold(fen_info->fi);
524 fib_work->fen_info = *fen_info;
525 fib_work->event = event;
526 fib_work->sw = router->sw;
527 INIT_WORK(&fib_work->work, __prestera_router_fib_event_work);
528 prestera_queue_work(&fib_work->work);
537 int prestera_router_init(struct prestera_switch *sw)
539 struct prestera_router *router;
542 router = kzalloc(sizeof(*sw->router), GFP_KERNEL);
549 err = prestera_router_hw_init(sw);
551 goto err_router_lib_init;
553 err = rhashtable_init(&router->kern_fib_cache_ht,
554 &__prestera_kern_fib_cache_ht_params);
556 goto err_kern_fib_cache_ht_init;
558 router->inetaddr_valid_nb.notifier_call = __prestera_inetaddr_valid_cb;
559 err = register_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
561 goto err_register_inetaddr_validator_notifier;
563 router->inetaddr_nb.notifier_call = __prestera_inetaddr_cb;
564 err = register_inetaddr_notifier(&router->inetaddr_nb);
566 goto err_register_inetaddr_notifier;
568 router->fib_nb.notifier_call = __prestera_router_fib_event;
569 err = register_fib_notifier(&init_net, &router->fib_nb,
570 /* TODO: flush fib entries */ NULL, NULL);
572 goto err_register_fib_notifier;
576 err_register_fib_notifier:
577 unregister_inetaddr_notifier(&router->inetaddr_nb);
578 err_register_inetaddr_notifier:
579 unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
580 err_register_inetaddr_validator_notifier:
581 rhashtable_destroy(&router->kern_fib_cache_ht);
582 err_kern_fib_cache_ht_init:
583 prestera_router_hw_fini(sw);
589 void prestera_router_fini(struct prestera_switch *sw)
591 unregister_inetaddr_notifier(&sw->router->inetaddr_nb);
592 unregister_inetaddr_validator_notifier(&sw->router->inetaddr_valid_nb);
593 rhashtable_destroy(&sw->router->kern_fib_cache_ht);
594 prestera_router_hw_fini(sw);