1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2019 Netronome Systems, Inc. */
3 
4 #include <linux/hash.h>
5 #include <linux/hashtable.h>
6 #include <linux/jhash.h>
7 #include <linux/math64.h>
8 #include <linux/vmalloc.h>
9 #include <net/pkt_cls.h>
10 #include <net/pkt_sched.h>
11 
12 #include "cmsg.h"
13 #include "main.h"
14 #include "../nfp_port.h"
15 
16 #define NFP_FL_QOS_UPDATE		msecs_to_jiffies(1000)
17 #define NFP_FL_QOS_PPS  BIT(15)
18 #define NFP_FL_QOS_METER  BIT(10)
19 
20 struct nfp_police_cfg_head {
21 	__be32 flags_opts;
22 	union {
23 		__be32 meter_id;
24 		__be32 port;
25 	};
26 };
27 
28 enum NFP_FL_QOS_TYPES {
29 	NFP_FL_QOS_TYPE_BPS,
30 	NFP_FL_QOS_TYPE_PPS,
31 	NFP_FL_QOS_TYPE_MAX,
32 };
33 
34 /* Police cmsg for configuring a trTCM traffic conditioner (8W/32B)
35  * See RFC 2698 for more details.
36  * ----------------------------------------------------------------
37  *    3                   2                   1
38  *  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
39  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40  * |             Reserved          |p|         Reserved            |
41  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42  * |                          Port Ingress                         |
43  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44  * |                        Token Bucket Peak                      |
45  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
46  * |                     Token Bucket Committed                    |
47  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
48  * |                         Peak Burst Size                       |
49  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
50  * |                      Committed Burst Size                     |
51  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
52  * |                      Peak Information Rate                    |
53  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54  * |                    Committed Information Rate                 |
55  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
56  * Word[0](FLag options):
57  * [15] p(pps) 1 for pps, 0 for bps
58  *
59  * Meter control message
60  *  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
61  * +-------------------------------+-+---+-----+-+---------+-+---+-+
62  * |            Reserved           |p| Y |TYPE |E|TSHFV    |P| PC|R|
63  * +-------------------------------+-+---+-----+-+---------+-+---+-+
64  * |                            meter ID                           |
65  * +-------------------------------+-------------------------------+
66  *
67  */
68 struct nfp_police_config {
69 	struct nfp_police_cfg_head head;
70 	__be32 bkt_tkn_p;
71 	__be32 bkt_tkn_c;
72 	__be32 pbs;
73 	__be32 cbs;
74 	__be32 pir;
75 	__be32 cir;
76 };
77 
78 struct nfp_police_stats_reply {
79 	struct nfp_police_cfg_head head;
80 	__be64 pass_bytes;
81 	__be64 pass_pkts;
82 	__be64 drop_bytes;
83 	__be64 drop_pkts;
84 };
85 
nfp_flower_offload_one_police(struct nfp_app * app,bool ingress,bool pps,u32 id,u32 rate,u32 burst)86 int nfp_flower_offload_one_police(struct nfp_app *app, bool ingress,
87 				  bool pps, u32 id, u32 rate, u32 burst)
88 {
89 	struct nfp_police_config *config;
90 	struct sk_buff *skb;
91 
92 	skb = nfp_flower_cmsg_alloc(app, sizeof(struct nfp_police_config),
93 				    NFP_FLOWER_CMSG_TYPE_QOS_MOD, GFP_KERNEL);
94 	if (!skb)
95 		return -ENOMEM;
96 
97 	config = nfp_flower_cmsg_get_data(skb);
98 	memset(config, 0, sizeof(struct nfp_police_config));
99 	if (pps)
100 		config->head.flags_opts |= cpu_to_be32(NFP_FL_QOS_PPS);
101 	if (!ingress)
102 		config->head.flags_opts |= cpu_to_be32(NFP_FL_QOS_METER);
103 
104 	if (ingress)
105 		config->head.port = cpu_to_be32(id);
106 	else
107 		config->head.meter_id = cpu_to_be32(id);
108 
109 	config->bkt_tkn_p = cpu_to_be32(burst);
110 	config->bkt_tkn_c = cpu_to_be32(burst);
111 	config->pbs = cpu_to_be32(burst);
112 	config->cbs = cpu_to_be32(burst);
113 	config->pir = cpu_to_be32(rate);
114 	config->cir = cpu_to_be32(rate);
115 	nfp_ctrl_tx(app->ctrl, skb);
116 
117 	return 0;
118 }
119 
nfp_policer_validate(const struct flow_action * action,const struct flow_action_entry * act,struct netlink_ext_ack * extack,bool ingress)120 static int nfp_policer_validate(const struct flow_action *action,
121 				const struct flow_action_entry *act,
122 				struct netlink_ext_ack *extack,
123 				bool ingress)
124 {
125 	if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
126 		NL_SET_ERR_MSG_MOD(extack,
127 				   "Offload not supported when exceed action is not drop");
128 		return -EOPNOTSUPP;
129 	}
130 
131 	if (ingress) {
132 		if (act->police.notexceed.act_id != FLOW_ACTION_CONTINUE &&
133 		    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
134 			NL_SET_ERR_MSG_MOD(extack,
135 					   "Offload not supported when conform action is not continue or ok");
136 			return -EOPNOTSUPP;
137 		}
138 	} else {
139 		if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
140 		    act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
141 			NL_SET_ERR_MSG_MOD(extack,
142 					   "Offload not supported when conform action is not pipe or ok");
143 			return -EOPNOTSUPP;
144 		}
145 	}
146 
147 	if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
148 	    !flow_action_is_last_entry(action, act)) {
149 		NL_SET_ERR_MSG_MOD(extack,
150 				   "Offload not supported when conform action is ok, but action is not last");
151 		return -EOPNOTSUPP;
152 	}
153 
154 	if (act->police.peakrate_bytes_ps ||
155 	    act->police.avrate || act->police.overhead) {
156 		NL_SET_ERR_MSG_MOD(extack,
157 				   "Offload not supported when peakrate/avrate/overhead is configured");
158 		return -EOPNOTSUPP;
159 	}
160 
161 	return 0;
162 }
163 
164 static int
nfp_flower_install_rate_limiter(struct nfp_app * app,struct net_device * netdev,struct tc_cls_matchall_offload * flow,struct netlink_ext_ack * extack)165 nfp_flower_install_rate_limiter(struct nfp_app *app, struct net_device *netdev,
166 				struct tc_cls_matchall_offload *flow,
167 				struct netlink_ext_ack *extack)
168 {
169 	struct flow_action_entry *paction = &flow->rule->action.entries[0];
170 	u32 action_num = flow->rule->action.num_entries;
171 	struct nfp_flower_priv *fl_priv = app->priv;
172 	struct flow_action_entry *action = NULL;
173 	struct nfp_flower_repr_priv *repr_priv;
174 	u32 netdev_port_id, i;
175 	struct nfp_repr *repr;
176 	bool pps_support;
177 	u32 bps_num = 0;
178 	u32 pps_num = 0;
179 	u32 burst;
180 	bool pps;
181 	u64 rate;
182 	int err;
183 
184 	if (!nfp_netdev_is_nfp_repr(netdev)) {
185 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload not supported on higher level port");
186 		return -EOPNOTSUPP;
187 	}
188 	repr = netdev_priv(netdev);
189 	repr_priv = repr->app_priv;
190 	netdev_port_id = nfp_repr_get_port_id(netdev);
191 	pps_support = !!(fl_priv->flower_ext_feats & NFP_FL_FEATS_QOS_PPS);
192 
193 	if (repr_priv->block_shared) {
194 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload not supported on shared blocks");
195 		return -EOPNOTSUPP;
196 	}
197 
198 	if (repr->port->type != NFP_PORT_VF_PORT) {
199 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload not supported on non-VF ports");
200 		return -EOPNOTSUPP;
201 	}
202 
203 	if (pps_support) {
204 		if (action_num > 2 || action_num == 0) {
205 			NL_SET_ERR_MSG_MOD(extack,
206 					   "unsupported offload: qos rate limit offload only support action number 1 or 2");
207 			return -EOPNOTSUPP;
208 		}
209 	} else {
210 		if (!flow_offload_has_one_action(&flow->rule->action)) {
211 			NL_SET_ERR_MSG_MOD(extack,
212 					   "unsupported offload: qos rate limit offload requires a single action");
213 			return -EOPNOTSUPP;
214 		}
215 	}
216 
217 	if (flow->common.prio != 1) {
218 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload requires highest priority");
219 		return -EOPNOTSUPP;
220 	}
221 
222 	for (i = 0 ; i < action_num; i++) {
223 		action = paction + i;
224 		if (action->id != FLOW_ACTION_POLICE) {
225 			NL_SET_ERR_MSG_MOD(extack,
226 					   "unsupported offload: qos rate limit offload requires police action");
227 			return -EOPNOTSUPP;
228 		}
229 
230 		err = nfp_policer_validate(&flow->rule->action, action, extack, true);
231 		if (err)
232 			return err;
233 
234 		if (action->police.rate_bytes_ps > 0) {
235 			if (bps_num++) {
236 				NL_SET_ERR_MSG_MOD(extack,
237 						   "unsupported offload: qos rate limit offload only support one BPS action");
238 				return -EOPNOTSUPP;
239 			}
240 		}
241 		if (action->police.rate_pkt_ps > 0) {
242 			if (!pps_support) {
243 				NL_SET_ERR_MSG_MOD(extack,
244 						   "unsupported offload: FW does not support PPS action");
245 				return -EOPNOTSUPP;
246 			}
247 			if (pps_num++) {
248 				NL_SET_ERR_MSG_MOD(extack,
249 						   "unsupported offload: qos rate limit offload only support one PPS action");
250 				return -EOPNOTSUPP;
251 			}
252 		}
253 	}
254 
255 	for (i = 0 ; i < action_num; i++) {
256 		/* Set QoS data for this interface */
257 		action = paction + i;
258 		if (action->police.rate_bytes_ps > 0) {
259 			rate = action->police.rate_bytes_ps;
260 			burst = action->police.burst;
261 		} else if (action->police.rate_pkt_ps > 0) {
262 			rate = action->police.rate_pkt_ps;
263 			burst = action->police.burst_pkt;
264 		} else {
265 			NL_SET_ERR_MSG_MOD(extack,
266 					   "unsupported offload: qos rate limit is not BPS or PPS");
267 			continue;
268 		}
269 
270 		if (rate != 0) {
271 			pps = false;
272 			if (action->police.rate_pkt_ps > 0)
273 				pps = true;
274 			nfp_flower_offload_one_police(repr->app, true,
275 						      pps, netdev_port_id,
276 						      rate, burst);
277 		}
278 	}
279 	repr_priv->qos_table.netdev_port_id = netdev_port_id;
280 	fl_priv->qos_rate_limiters++;
281 	if (fl_priv->qos_rate_limiters == 1)
282 		schedule_delayed_work(&fl_priv->qos_stats_work,
283 				      NFP_FL_QOS_UPDATE);
284 
285 	return 0;
286 }
287 
288 static int
nfp_flower_remove_rate_limiter(struct nfp_app * app,struct net_device * netdev,struct tc_cls_matchall_offload * flow,struct netlink_ext_ack * extack)289 nfp_flower_remove_rate_limiter(struct nfp_app *app, struct net_device *netdev,
290 			       struct tc_cls_matchall_offload *flow,
291 			       struct netlink_ext_ack *extack)
292 {
293 	struct nfp_flower_priv *fl_priv = app->priv;
294 	struct nfp_flower_repr_priv *repr_priv;
295 	struct nfp_police_config *config;
296 	u32 netdev_port_id, i;
297 	struct nfp_repr *repr;
298 	struct sk_buff *skb;
299 	bool pps_support;
300 
301 	if (!nfp_netdev_is_nfp_repr(netdev)) {
302 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload not supported on higher level port");
303 		return -EOPNOTSUPP;
304 	}
305 	repr = netdev_priv(netdev);
306 
307 	netdev_port_id = nfp_repr_get_port_id(netdev);
308 	repr_priv = repr->app_priv;
309 	pps_support = !!(fl_priv->flower_ext_feats & NFP_FL_FEATS_QOS_PPS);
310 
311 	if (!repr_priv->qos_table.netdev_port_id) {
312 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot remove qos entry that does not exist");
313 		return -EOPNOTSUPP;
314 	}
315 
316 	memset(&repr_priv->qos_table, 0, sizeof(struct nfp_fl_qos));
317 	fl_priv->qos_rate_limiters--;
318 	if (!fl_priv->qos_rate_limiters)
319 		cancel_delayed_work_sync(&fl_priv->qos_stats_work);
320 	for (i = 0 ; i < NFP_FL_QOS_TYPE_MAX; i++) {
321 		if (i == NFP_FL_QOS_TYPE_PPS && !pps_support)
322 			break;
323 		/* 0:bps 1:pps
324 		 * Clear QoS data for this interface.
325 		 * There is no need to check if a specific QOS_TYPE was
326 		 * configured as the firmware handles clearing a QoS entry
327 		 * safely, even if it wasn't explicitly added.
328 		 */
329 		skb = nfp_flower_cmsg_alloc(repr->app, sizeof(struct nfp_police_config),
330 					    NFP_FLOWER_CMSG_TYPE_QOS_DEL, GFP_KERNEL);
331 		if (!skb)
332 			return -ENOMEM;
333 
334 		config = nfp_flower_cmsg_get_data(skb);
335 		memset(config, 0, sizeof(struct nfp_police_config));
336 		if (i == NFP_FL_QOS_TYPE_PPS)
337 			config->head.flags_opts = cpu_to_be32(NFP_FL_QOS_PPS);
338 		config->head.port = cpu_to_be32(netdev_port_id);
339 		nfp_ctrl_tx(repr->app->ctrl, skb);
340 	}
341 
342 	return 0;
343 }
344 
nfp_flower_stats_rlim_reply(struct nfp_app * app,struct sk_buff * skb)345 void nfp_flower_stats_rlim_reply(struct nfp_app *app, struct sk_buff *skb)
346 {
347 	struct nfp_flower_priv *fl_priv = app->priv;
348 	struct nfp_flower_repr_priv *repr_priv;
349 	struct nfp_police_stats_reply *msg;
350 	struct nfp_stat_pair *curr_stats;
351 	struct nfp_stat_pair *prev_stats;
352 	struct net_device *netdev;
353 	struct nfp_repr *repr;
354 	u32 netdev_port_id;
355 
356 	msg = nfp_flower_cmsg_get_data(skb);
357 	if (be32_to_cpu(msg->head.flags_opts) & NFP_FL_QOS_METER)
358 		return nfp_act_stats_reply(app, msg);
359 
360 	netdev_port_id = be32_to_cpu(msg->head.port);
361 	rcu_read_lock();
362 	netdev = nfp_app_dev_get(app, netdev_port_id, NULL);
363 	if (!netdev)
364 		goto exit_unlock_rcu;
365 
366 	repr = netdev_priv(netdev);
367 	repr_priv = repr->app_priv;
368 	curr_stats = &repr_priv->qos_table.curr_stats;
369 	prev_stats = &repr_priv->qos_table.prev_stats;
370 
371 	spin_lock_bh(&fl_priv->qos_stats_lock);
372 	curr_stats->pkts = be64_to_cpu(msg->pass_pkts) +
373 			   be64_to_cpu(msg->drop_pkts);
374 	curr_stats->bytes = be64_to_cpu(msg->pass_bytes) +
375 			    be64_to_cpu(msg->drop_bytes);
376 
377 	if (!repr_priv->qos_table.last_update) {
378 		prev_stats->pkts = curr_stats->pkts;
379 		prev_stats->bytes = curr_stats->bytes;
380 	}
381 
382 	repr_priv->qos_table.last_update = jiffies;
383 	spin_unlock_bh(&fl_priv->qos_stats_lock);
384 
385 exit_unlock_rcu:
386 	rcu_read_unlock();
387 }
388 
389 static void
nfp_flower_stats_rlim_request(struct nfp_flower_priv * fl_priv,u32 id,bool ingress)390 nfp_flower_stats_rlim_request(struct nfp_flower_priv *fl_priv,
391 			      u32 id, bool ingress)
392 {
393 	struct nfp_police_cfg_head *head;
394 	struct sk_buff *skb;
395 
396 	skb = nfp_flower_cmsg_alloc(fl_priv->app,
397 				    sizeof(struct nfp_police_cfg_head),
398 				    NFP_FLOWER_CMSG_TYPE_QOS_STATS,
399 				    GFP_ATOMIC);
400 	if (!skb)
401 		return;
402 	head = nfp_flower_cmsg_get_data(skb);
403 
404 	memset(head, 0, sizeof(struct nfp_police_cfg_head));
405 	if (ingress) {
406 		head->port = cpu_to_be32(id);
407 	} else {
408 		head->flags_opts = cpu_to_be32(NFP_FL_QOS_METER);
409 		head->meter_id = cpu_to_be32(id);
410 	}
411 
412 	nfp_ctrl_tx(fl_priv->app->ctrl, skb);
413 }
414 
415 static void
nfp_flower_stats_rlim_request_all(struct nfp_flower_priv * fl_priv)416 nfp_flower_stats_rlim_request_all(struct nfp_flower_priv *fl_priv)
417 {
418 	struct nfp_reprs *repr_set;
419 	int i;
420 
421 	rcu_read_lock();
422 	repr_set = rcu_dereference(fl_priv->app->reprs[NFP_REPR_TYPE_VF]);
423 	if (!repr_set)
424 		goto exit_unlock_rcu;
425 
426 	for (i = 0; i < repr_set->num_reprs; i++) {
427 		struct net_device *netdev;
428 
429 		netdev = rcu_dereference(repr_set->reprs[i]);
430 		if (netdev) {
431 			struct nfp_repr *priv = netdev_priv(netdev);
432 			struct nfp_flower_repr_priv *repr_priv;
433 			u32 netdev_port_id;
434 
435 			repr_priv = priv->app_priv;
436 			netdev_port_id = repr_priv->qos_table.netdev_port_id;
437 			if (!netdev_port_id)
438 				continue;
439 
440 			nfp_flower_stats_rlim_request(fl_priv,
441 						      netdev_port_id, true);
442 		}
443 	}
444 
445 exit_unlock_rcu:
446 	rcu_read_unlock();
447 }
448 
update_stats_cache(struct work_struct * work)449 static void update_stats_cache(struct work_struct *work)
450 {
451 	struct delayed_work *delayed_work;
452 	struct nfp_flower_priv *fl_priv;
453 
454 	delayed_work = to_delayed_work(work);
455 	fl_priv = container_of(delayed_work, struct nfp_flower_priv,
456 			       qos_stats_work);
457 
458 	nfp_flower_stats_rlim_request_all(fl_priv);
459 	nfp_flower_stats_meter_request_all(fl_priv);
460 
461 	schedule_delayed_work(&fl_priv->qos_stats_work, NFP_FL_QOS_UPDATE);
462 }
463 
464 static int
nfp_flower_stats_rate_limiter(struct nfp_app * app,struct net_device * netdev,struct tc_cls_matchall_offload * flow,struct netlink_ext_ack * extack)465 nfp_flower_stats_rate_limiter(struct nfp_app *app, struct net_device *netdev,
466 			      struct tc_cls_matchall_offload *flow,
467 			      struct netlink_ext_ack *extack)
468 {
469 	struct nfp_flower_priv *fl_priv = app->priv;
470 	struct nfp_flower_repr_priv *repr_priv;
471 	struct nfp_stat_pair *curr_stats;
472 	struct nfp_stat_pair *prev_stats;
473 	u64 diff_bytes, diff_pkts;
474 	struct nfp_repr *repr;
475 
476 	if (!nfp_netdev_is_nfp_repr(netdev)) {
477 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload not supported on higher level port");
478 		return -EOPNOTSUPP;
479 	}
480 	repr = netdev_priv(netdev);
481 
482 	repr_priv = repr->app_priv;
483 	if (!repr_priv->qos_table.netdev_port_id) {
484 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot find qos entry for stats update");
485 		return -EOPNOTSUPP;
486 	}
487 
488 	spin_lock_bh(&fl_priv->qos_stats_lock);
489 	curr_stats = &repr_priv->qos_table.curr_stats;
490 	prev_stats = &repr_priv->qos_table.prev_stats;
491 	diff_pkts = curr_stats->pkts - prev_stats->pkts;
492 	diff_bytes = curr_stats->bytes - prev_stats->bytes;
493 	prev_stats->pkts = curr_stats->pkts;
494 	prev_stats->bytes = curr_stats->bytes;
495 	spin_unlock_bh(&fl_priv->qos_stats_lock);
496 
497 	flow_stats_update(&flow->stats, diff_bytes, diff_pkts, 0,
498 			  repr_priv->qos_table.last_update,
499 			  FLOW_ACTION_HW_STATS_DELAYED);
500 	return 0;
501 }
502 
nfp_flower_qos_init(struct nfp_app * app)503 void nfp_flower_qos_init(struct nfp_app *app)
504 {
505 	struct nfp_flower_priv *fl_priv = app->priv;
506 
507 	spin_lock_init(&fl_priv->qos_stats_lock);
508 	mutex_init(&fl_priv->meter_stats_lock);
509 	nfp_init_meter_table(app);
510 
511 	INIT_DELAYED_WORK(&fl_priv->qos_stats_work, &update_stats_cache);
512 }
513 
nfp_flower_qos_cleanup(struct nfp_app * app)514 void nfp_flower_qos_cleanup(struct nfp_app *app)
515 {
516 	struct nfp_flower_priv *fl_priv = app->priv;
517 
518 	cancel_delayed_work_sync(&fl_priv->qos_stats_work);
519 }
520 
nfp_flower_setup_qos_offload(struct nfp_app * app,struct net_device * netdev,struct tc_cls_matchall_offload * flow)521 int nfp_flower_setup_qos_offload(struct nfp_app *app, struct net_device *netdev,
522 				 struct tc_cls_matchall_offload *flow)
523 {
524 	struct netlink_ext_ack *extack = flow->common.extack;
525 	struct nfp_flower_priv *fl_priv = app->priv;
526 
527 	if (!(fl_priv->flower_ext_feats & NFP_FL_FEATS_VF_RLIM)) {
528 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support qos rate limit offload");
529 		return -EOPNOTSUPP;
530 	}
531 
532 	switch (flow->command) {
533 	case TC_CLSMATCHALL_REPLACE:
534 		return nfp_flower_install_rate_limiter(app, netdev, flow,
535 						       extack);
536 	case TC_CLSMATCHALL_DESTROY:
537 		return nfp_flower_remove_rate_limiter(app, netdev, flow,
538 						      extack);
539 	case TC_CLSMATCHALL_STATS:
540 		return nfp_flower_stats_rate_limiter(app, netdev, flow,
541 						     extack);
542 	default:
543 		return -EOPNOTSUPP;
544 	}
545 }
546 
547 /* Offload tc action, currently only for tc police */
548 
549 static const struct rhashtable_params stats_meter_table_params = {
550 	.key_offset	= offsetof(struct nfp_meter_entry, meter_id),
551 	.head_offset	= offsetof(struct nfp_meter_entry, ht_node),
552 	.key_len	= sizeof(u32),
553 };
554 
555 struct nfp_meter_entry *
nfp_flower_search_meter_entry(struct nfp_app * app,u32 meter_id)556 nfp_flower_search_meter_entry(struct nfp_app *app, u32 meter_id)
557 {
558 	struct nfp_flower_priv *priv = app->priv;
559 
560 	return rhashtable_lookup_fast(&priv->meter_table, &meter_id,
561 				      stats_meter_table_params);
562 }
563 
564 static struct nfp_meter_entry *
nfp_flower_add_meter_entry(struct nfp_app * app,u32 meter_id)565 nfp_flower_add_meter_entry(struct nfp_app *app, u32 meter_id)
566 {
567 	struct nfp_meter_entry *meter_entry = NULL;
568 	struct nfp_flower_priv *priv = app->priv;
569 
570 	meter_entry = rhashtable_lookup_fast(&priv->meter_table,
571 					     &meter_id,
572 					     stats_meter_table_params);
573 	if (meter_entry)
574 		return meter_entry;
575 
576 	meter_entry = kzalloc(sizeof(*meter_entry), GFP_KERNEL);
577 	if (!meter_entry)
578 		return NULL;
579 
580 	meter_entry->meter_id = meter_id;
581 	meter_entry->used = jiffies;
582 	if (rhashtable_insert_fast(&priv->meter_table, &meter_entry->ht_node,
583 				   stats_meter_table_params)) {
584 		kfree(meter_entry);
585 		return NULL;
586 	}
587 
588 	priv->qos_rate_limiters++;
589 	if (priv->qos_rate_limiters == 1)
590 		schedule_delayed_work(&priv->qos_stats_work,
591 				      NFP_FL_QOS_UPDATE);
592 
593 	return meter_entry;
594 }
595 
nfp_flower_del_meter_entry(struct nfp_app * app,u32 meter_id)596 static void nfp_flower_del_meter_entry(struct nfp_app *app, u32 meter_id)
597 {
598 	struct nfp_meter_entry *meter_entry = NULL;
599 	struct nfp_flower_priv *priv = app->priv;
600 
601 	meter_entry = rhashtable_lookup_fast(&priv->meter_table, &meter_id,
602 					     stats_meter_table_params);
603 	if (!meter_entry)
604 		return;
605 
606 	rhashtable_remove_fast(&priv->meter_table,
607 			       &meter_entry->ht_node,
608 			       stats_meter_table_params);
609 	kfree(meter_entry);
610 	priv->qos_rate_limiters--;
611 	if (!priv->qos_rate_limiters)
612 		cancel_delayed_work_sync(&priv->qos_stats_work);
613 }
614 
nfp_flower_setup_meter_entry(struct nfp_app * app,const struct flow_action_entry * action,enum nfp_meter_op op,u32 meter_id)615 int nfp_flower_setup_meter_entry(struct nfp_app *app,
616 				 const struct flow_action_entry *action,
617 				 enum nfp_meter_op op,
618 				 u32 meter_id)
619 {
620 	struct nfp_flower_priv *fl_priv = app->priv;
621 	struct nfp_meter_entry *meter_entry = NULL;
622 	int err = 0;
623 
624 	mutex_lock(&fl_priv->meter_stats_lock);
625 
626 	switch (op) {
627 	case NFP_METER_DEL:
628 		nfp_flower_del_meter_entry(app, meter_id);
629 		goto exit_unlock;
630 	case NFP_METER_ADD:
631 		meter_entry = nfp_flower_add_meter_entry(app, meter_id);
632 		break;
633 	default:
634 		err = -EOPNOTSUPP;
635 		goto exit_unlock;
636 	}
637 
638 	if (!meter_entry) {
639 		err = -ENOMEM;
640 		goto exit_unlock;
641 	}
642 
643 	if (action->police.rate_bytes_ps > 0) {
644 		meter_entry->bps = true;
645 		meter_entry->rate = action->police.rate_bytes_ps;
646 		meter_entry->burst = action->police.burst;
647 	} else {
648 		meter_entry->bps = false;
649 		meter_entry->rate = action->police.rate_pkt_ps;
650 		meter_entry->burst = action->police.burst_pkt;
651 	}
652 
653 exit_unlock:
654 	mutex_unlock(&fl_priv->meter_stats_lock);
655 	return err;
656 }
657 
nfp_init_meter_table(struct nfp_app * app)658 int nfp_init_meter_table(struct nfp_app *app)
659 {
660 	struct nfp_flower_priv *priv = app->priv;
661 
662 	return rhashtable_init(&priv->meter_table, &stats_meter_table_params);
663 }
664 
665 void
nfp_flower_stats_meter_request_all(struct nfp_flower_priv * fl_priv)666 nfp_flower_stats_meter_request_all(struct nfp_flower_priv *fl_priv)
667 {
668 	struct nfp_meter_entry *meter_entry = NULL;
669 	struct rhashtable_iter iter;
670 
671 	mutex_lock(&fl_priv->meter_stats_lock);
672 	rhashtable_walk_enter(&fl_priv->meter_table, &iter);
673 	rhashtable_walk_start(&iter);
674 
675 	while ((meter_entry = rhashtable_walk_next(&iter)) != NULL) {
676 		if (IS_ERR(meter_entry))
677 			continue;
678 		nfp_flower_stats_rlim_request(fl_priv,
679 					      meter_entry->meter_id, false);
680 	}
681 
682 	rhashtable_walk_stop(&iter);
683 	rhashtable_walk_exit(&iter);
684 	mutex_unlock(&fl_priv->meter_stats_lock);
685 }
686 
687 static int
nfp_act_install_actions(struct nfp_app * app,struct flow_offload_action * fl_act,struct netlink_ext_ack * extack)688 nfp_act_install_actions(struct nfp_app *app, struct flow_offload_action *fl_act,
689 			struct netlink_ext_ack *extack)
690 {
691 	struct flow_action_entry *paction = &fl_act->action.entries[0];
692 	u32 action_num = fl_act->action.num_entries;
693 	struct nfp_flower_priv *fl_priv = app->priv;
694 	struct flow_action_entry *action = NULL;
695 	u32 burst, i, meter_id;
696 	bool pps_support, pps;
697 	bool add = false;
698 	u64 rate;
699 	int err;
700 
701 	pps_support = !!(fl_priv->flower_ext_feats & NFP_FL_FEATS_QOS_PPS);
702 
703 	for (i = 0 ; i < action_num; i++) {
704 		/* Set qos associate data for this interface */
705 		action = paction + i;
706 		if (action->id != FLOW_ACTION_POLICE) {
707 			NL_SET_ERR_MSG_MOD(extack,
708 					   "unsupported offload: qos rate limit offload requires police action");
709 			continue;
710 		}
711 
712 		err = nfp_policer_validate(&fl_act->action, action, extack, false);
713 		if (err)
714 			return err;
715 
716 		if (action->police.rate_bytes_ps > 0) {
717 			rate = action->police.rate_bytes_ps;
718 			burst = action->police.burst;
719 		} else if (action->police.rate_pkt_ps > 0 && pps_support) {
720 			rate = action->police.rate_pkt_ps;
721 			burst = action->police.burst_pkt;
722 		} else {
723 			NL_SET_ERR_MSG_MOD(extack,
724 					   "unsupported offload: unsupported qos rate limit");
725 			continue;
726 		}
727 
728 		if (rate != 0) {
729 			meter_id = action->hw_index;
730 			if (nfp_flower_setup_meter_entry(app, action, NFP_METER_ADD, meter_id))
731 				continue;
732 
733 			pps = false;
734 			if (action->police.rate_pkt_ps > 0)
735 				pps = true;
736 			nfp_flower_offload_one_police(app, false, pps, meter_id,
737 						      rate, burst);
738 			add = true;
739 		}
740 	}
741 
742 	return add ? 0 : -EOPNOTSUPP;
743 }
744 
745 static int
nfp_act_remove_actions(struct nfp_app * app,struct flow_offload_action * fl_act,struct netlink_ext_ack * extack)746 nfp_act_remove_actions(struct nfp_app *app, struct flow_offload_action *fl_act,
747 		       struct netlink_ext_ack *extack)
748 {
749 	struct nfp_meter_entry *meter_entry = NULL;
750 	struct nfp_police_config *config;
751 	struct sk_buff *skb;
752 	u32 meter_id;
753 	bool pps;
754 
755 	/* Delete qos associate data for this interface */
756 	if (fl_act->id != FLOW_ACTION_POLICE) {
757 		NL_SET_ERR_MSG_MOD(extack,
758 				   "unsupported offload: qos rate limit offload requires police action");
759 		return -EOPNOTSUPP;
760 	}
761 
762 	meter_id = fl_act->index;
763 	meter_entry = nfp_flower_search_meter_entry(app, meter_id);
764 	if (!meter_entry) {
765 		NL_SET_ERR_MSG_MOD(extack,
766 				   "no meter entry when delete the action index.");
767 		return -ENOENT;
768 	}
769 	pps = !meter_entry->bps;
770 
771 	skb = nfp_flower_cmsg_alloc(app, sizeof(struct nfp_police_config),
772 				    NFP_FLOWER_CMSG_TYPE_QOS_DEL, GFP_KERNEL);
773 	if (!skb)
774 		return -ENOMEM;
775 
776 	config = nfp_flower_cmsg_get_data(skb);
777 	memset(config, 0, sizeof(struct nfp_police_config));
778 	config->head.flags_opts = cpu_to_be32(NFP_FL_QOS_METER);
779 	config->head.meter_id = cpu_to_be32(meter_id);
780 	if (pps)
781 		config->head.flags_opts |= cpu_to_be32(NFP_FL_QOS_PPS);
782 
783 	nfp_ctrl_tx(app->ctrl, skb);
784 	nfp_flower_setup_meter_entry(app, NULL, NFP_METER_DEL, meter_id);
785 
786 	return 0;
787 }
788 
789 void
nfp_act_stats_reply(struct nfp_app * app,void * pmsg)790 nfp_act_stats_reply(struct nfp_app *app, void *pmsg)
791 {
792 	struct nfp_flower_priv *fl_priv = app->priv;
793 	struct nfp_meter_entry *meter_entry = NULL;
794 	struct nfp_police_stats_reply *msg = pmsg;
795 	u32 meter_id;
796 
797 	meter_id = be32_to_cpu(msg->head.meter_id);
798 	mutex_lock(&fl_priv->meter_stats_lock);
799 
800 	meter_entry = nfp_flower_search_meter_entry(app, meter_id);
801 	if (!meter_entry)
802 		goto exit_unlock;
803 
804 	meter_entry->stats.curr.pkts = be64_to_cpu(msg->pass_pkts) +
805 				       be64_to_cpu(msg->drop_pkts);
806 	meter_entry->stats.curr.bytes = be64_to_cpu(msg->pass_bytes) +
807 					be64_to_cpu(msg->drop_bytes);
808 	meter_entry->stats.curr.drops = be64_to_cpu(msg->drop_pkts);
809 	if (!meter_entry->stats.update) {
810 		meter_entry->stats.prev.pkts = meter_entry->stats.curr.pkts;
811 		meter_entry->stats.prev.bytes = meter_entry->stats.curr.bytes;
812 		meter_entry->stats.prev.drops = meter_entry->stats.curr.drops;
813 	}
814 
815 	meter_entry->stats.update = jiffies;
816 
817 exit_unlock:
818 	mutex_unlock(&fl_priv->meter_stats_lock);
819 }
820 
821 static int
nfp_act_stats_actions(struct nfp_app * app,struct flow_offload_action * fl_act,struct netlink_ext_ack * extack)822 nfp_act_stats_actions(struct nfp_app *app, struct flow_offload_action *fl_act,
823 		      struct netlink_ext_ack *extack)
824 {
825 	struct nfp_flower_priv *fl_priv = app->priv;
826 	struct nfp_meter_entry *meter_entry = NULL;
827 	u64 diff_bytes, diff_pkts, diff_drops;
828 	int err = 0;
829 
830 	if (fl_act->id != FLOW_ACTION_POLICE) {
831 		NL_SET_ERR_MSG_MOD(extack,
832 				   "unsupported offload: qos rate limit offload requires police action");
833 		return -EOPNOTSUPP;
834 	}
835 
836 	mutex_lock(&fl_priv->meter_stats_lock);
837 	meter_entry = nfp_flower_search_meter_entry(app, fl_act->index);
838 	if (!meter_entry) {
839 		err = -ENOENT;
840 		goto exit_unlock;
841 	}
842 	diff_pkts = meter_entry->stats.curr.pkts > meter_entry->stats.prev.pkts ?
843 		    meter_entry->stats.curr.pkts - meter_entry->stats.prev.pkts : 0;
844 	diff_bytes = meter_entry->stats.curr.bytes > meter_entry->stats.prev.bytes ?
845 		     meter_entry->stats.curr.bytes - meter_entry->stats.prev.bytes : 0;
846 	diff_drops = meter_entry->stats.curr.drops > meter_entry->stats.prev.drops ?
847 		     meter_entry->stats.curr.drops - meter_entry->stats.prev.drops : 0;
848 
849 	flow_stats_update(&fl_act->stats, diff_bytes, diff_pkts, diff_drops,
850 			  meter_entry->stats.update,
851 			  FLOW_ACTION_HW_STATS_DELAYED);
852 
853 	meter_entry->stats.prev.pkts = meter_entry->stats.curr.pkts;
854 	meter_entry->stats.prev.bytes = meter_entry->stats.curr.bytes;
855 	meter_entry->stats.prev.drops = meter_entry->stats.curr.drops;
856 
857 exit_unlock:
858 	mutex_unlock(&fl_priv->meter_stats_lock);
859 	return err;
860 }
861 
nfp_setup_tc_act_offload(struct nfp_app * app,struct flow_offload_action * fl_act)862 int nfp_setup_tc_act_offload(struct nfp_app *app,
863 			     struct flow_offload_action *fl_act)
864 {
865 	struct netlink_ext_ack *extack = fl_act->extack;
866 	struct nfp_flower_priv *fl_priv = app->priv;
867 
868 	if (!(fl_priv->flower_ext_feats & NFP_FL_FEATS_QOS_METER))
869 		return -EOPNOTSUPP;
870 
871 	switch (fl_act->command) {
872 	case FLOW_ACT_REPLACE:
873 		return nfp_act_install_actions(app, fl_act, extack);
874 	case FLOW_ACT_DESTROY:
875 		return nfp_act_remove_actions(app, fl_act, extack);
876 	case FLOW_ACT_STATS:
877 		return nfp_act_stats_actions(app, fl_act, extack);
878 	default:
879 		return -EOPNOTSUPP;
880 	}
881 }
882