1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * net/sched/cls_matchll.c Match-all classifier
5 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/percpu.h>
13 #include <net/sch_generic.h>
14 #include <net/pkt_cls.h>
16 struct cls_mall_head {
18 struct tcf_result res;
21 unsigned int in_hw_count;
22 struct tc_matchall_pcnt __percpu *pf;
23 struct rcu_work rwork;
27 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp,
28 struct tcf_result *res)
30 struct cls_mall_head *head = rcu_dereference_bh(tp->root);
35 if (tc_skip_sw(head->flags))
39 __this_cpu_inc(head->pf->rhit);
40 return tcf_exts_exec(skb, &head->exts, res);
43 static int mall_init(struct tcf_proto *tp)
48 static void __mall_destroy(struct cls_mall_head *head)
50 tcf_exts_destroy(&head->exts);
51 tcf_exts_put_net(&head->exts);
52 free_percpu(head->pf);
56 static void mall_destroy_work(struct work_struct *work)
58 struct cls_mall_head *head = container_of(to_rcu_work(work),
66 static void mall_destroy_hw_filter(struct tcf_proto *tp,
67 struct cls_mall_head *head,
69 struct netlink_ext_ack *extack)
71 struct tc_cls_matchall_offload cls_mall = {};
72 struct tcf_block *block = tp->chain->block;
74 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
75 cls_mall.command = TC_CLSMATCHALL_DESTROY;
76 cls_mall.cookie = cookie;
78 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false,
79 &head->flags, &head->in_hw_count, true);
82 static int mall_replace_hw_filter(struct tcf_proto *tp,
83 struct cls_mall_head *head,
85 struct netlink_ext_ack *extack)
87 struct tc_cls_matchall_offload cls_mall = {};
88 struct tcf_block *block = tp->chain->block;
89 bool skip_sw = tc_skip_sw(head->flags);
92 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
96 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
97 cls_mall.command = TC_CLSMATCHALL_REPLACE;
98 cls_mall.cookie = cookie;
100 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true);
102 kfree(cls_mall.rule);
103 mall_destroy_hw_filter(tp, head, cookie, NULL);
105 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
112 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall,
113 skip_sw, &head->flags, &head->in_hw_count, true);
114 tc_cleanup_flow_action(&cls_mall.rule->action);
115 kfree(cls_mall.rule);
118 mall_destroy_hw_filter(tp, head, cookie, NULL);
122 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW))
128 static void mall_destroy(struct tcf_proto *tp, bool rtnl_held,
129 struct netlink_ext_ack *extack)
131 struct cls_mall_head *head = rtnl_dereference(tp->root);
136 tcf_unbind_filter(tp, &head->res);
138 if (!tc_skip_hw(head->flags))
139 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack);
141 if (tcf_exts_get_net(&head->exts))
142 tcf_queue_work(&head->rwork, mall_destroy_work);
144 __mall_destroy(head);
147 static void *mall_get(struct tcf_proto *tp, u32 handle)
149 struct cls_mall_head *head = rtnl_dereference(tp->root);
151 if (head && head->handle == handle)
157 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
158 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC },
159 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 },
160 [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 },
163 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
164 struct cls_mall_head *head,
165 unsigned long base, struct nlattr **tb,
166 struct nlattr *est, bool ovr,
167 struct netlink_ext_ack *extack)
171 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
176 if (tb[TCA_MATCHALL_CLASSID]) {
177 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]);
178 tcf_bind_filter(tp, &head->res, base);
183 static int mall_change(struct net *net, struct sk_buff *in_skb,
184 struct tcf_proto *tp, unsigned long base,
185 u32 handle, struct nlattr **tca,
186 void **arg, bool ovr, bool rtnl_held,
187 struct netlink_ext_ack *extack)
189 struct cls_mall_head *head = rtnl_dereference(tp->root);
190 struct nlattr *tb[TCA_MATCHALL_MAX + 1];
191 struct cls_mall_head *new;
195 if (!tca[TCA_OPTIONS])
201 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX,
202 tca[TCA_OPTIONS], mall_policy, NULL);
206 if (tb[TCA_MATCHALL_FLAGS]) {
207 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]);
208 if (!tc_flags_valid(flags))
212 new = kzalloc(sizeof(*new), GFP_KERNEL);
216 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0);
222 new->handle = handle;
224 new->pf = alloc_percpu(struct tc_matchall_pcnt);
227 goto err_alloc_percpu;
230 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
235 if (!tc_skip_hw(new->flags)) {
236 err = mall_replace_hw_filter(tp, new, (unsigned long)new,
239 goto err_replace_hw_filter;
242 if (!tc_in_hw(new->flags))
243 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
246 rcu_assign_pointer(tp->root, new);
249 err_replace_hw_filter:
251 free_percpu(new->pf);
253 tcf_exts_destroy(&new->exts);
259 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last,
260 bool rtnl_held, struct netlink_ext_ack *extack)
262 struct cls_mall_head *head = rtnl_dereference(tp->root);
264 head->deleting = true;
269 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg,
272 struct cls_mall_head *head = rtnl_dereference(tp->root);
274 if (arg->count < arg->skip)
277 if (!head || head->deleting)
279 if (arg->fn(tp, head, arg) < 0)
285 static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
286 void *cb_priv, struct netlink_ext_ack *extack)
288 struct cls_mall_head *head = rtnl_dereference(tp->root);
289 struct tc_cls_matchall_offload cls_mall = {};
290 struct tcf_block *block = tp->chain->block;
293 if (tc_skip_hw(head->flags))
296 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts));
300 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack);
301 cls_mall.command = add ?
302 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
303 cls_mall.cookie = (unsigned long)head;
305 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true);
307 kfree(cls_mall.rule);
308 if (add && tc_skip_sw(head->flags)) {
309 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action");
315 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL,
316 &cls_mall, cb_priv, &head->flags,
318 tc_cleanup_flow_action(&cls_mall.rule->action);
319 kfree(cls_mall.rule);
327 static void mall_stats_hw_filter(struct tcf_proto *tp,
328 struct cls_mall_head *head,
329 unsigned long cookie)
331 struct tc_cls_matchall_offload cls_mall = {};
332 struct tcf_block *block = tp->chain->block;
334 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL);
335 cls_mall.command = TC_CLSMATCHALL_STATS;
336 cls_mall.cookie = cookie;
338 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true);
340 tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes,
341 cls_mall.stats.pkts, cls_mall.stats.lastused);
344 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh,
345 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
347 struct tc_matchall_pcnt gpf = {};
348 struct cls_mall_head *head = fh;
355 if (!tc_skip_hw(head->flags))
356 mall_stats_hw_filter(tp, head, (unsigned long)head);
358 t->tcm_handle = head->handle;
360 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
362 goto nla_put_failure;
364 if (head->res.classid &&
365 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid))
366 goto nla_put_failure;
368 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags))
369 goto nla_put_failure;
371 for_each_possible_cpu(cpu) {
372 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu);
374 gpf.rhit += pf->rhit;
377 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT,
378 sizeof(struct tc_matchall_pcnt),
379 &gpf, TCA_MATCHALL_PAD))
380 goto nla_put_failure;
382 if (tcf_exts_dump(skb, &head->exts))
383 goto nla_put_failure;
385 nla_nest_end(skb, nest);
387 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
388 goto nla_put_failure;
393 nla_nest_cancel(skb, nest);
397 static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
400 struct cls_mall_head *head = fh;
402 if (head && head->res.classid == classid) {
404 __tcf_bind_filter(q, &head->res, base);
406 __tcf_unbind_filter(q, &head->res);
410 static struct tcf_proto_ops cls_mall_ops __read_mostly = {
412 .classify = mall_classify,
414 .destroy = mall_destroy,
416 .change = mall_change,
417 .delete = mall_delete,
419 .reoffload = mall_reoffload,
421 .bind_class = mall_bind_class,
422 .owner = THIS_MODULE,
425 static int __init cls_mall_init(void)
427 return register_tcf_proto_ops(&cls_mall_ops);
430 static void __exit cls_mall_exit(void)
432 unregister_tcf_proto_ops(&cls_mall_ops);
435 module_init(cls_mall_init);
436 module_exit(cls_mall_exit);
438 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>");
439 MODULE_DESCRIPTION("Match-all classifier");
440 MODULE_LICENSE("GPL v2");