Commit | Line | Data |
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bf3994d2 JP |
1 | /* |
2 | * net/sched/cls_matchll.c Match-all classifier | |
3 | * | |
4 | * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | ||
16 | #include <net/sch_generic.h> | |
17 | #include <net/pkt_cls.h> | |
18 | ||
fd62d9f5 | 19 | struct cls_mall_head { |
bf3994d2 JP |
20 | struct tcf_exts exts; |
21 | struct tcf_result res; | |
22 | u32 handle; | |
b87f7936 | 23 | u32 flags; |
df2735ee CW |
24 | union { |
25 | struct work_struct work; | |
26 | struct rcu_head rcu; | |
27 | }; | |
bf3994d2 JP |
28 | }; |
29 | ||
30 | static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
31 | struct tcf_result *res) | |
32 | { | |
33 | struct cls_mall_head *head = rcu_dereference_bh(tp->root); | |
bf3994d2 | 34 | |
fd62d9f5 | 35 | if (tc_skip_sw(head->flags)) |
b87f7936 YG |
36 | return -1; |
37 | ||
3ff4cbec | 38 | *res = head->res; |
fd62d9f5 | 39 | return tcf_exts_exec(skb, &head->exts, res); |
bf3994d2 JP |
40 | } |
41 | ||
42 | static int mall_init(struct tcf_proto *tp) | |
43 | { | |
bf3994d2 JP |
44 | return 0; |
45 | } | |
46 | ||
df2735ee CW |
47 | static void mall_destroy_work(struct work_struct *work) |
48 | { | |
49 | struct cls_mall_head *head = container_of(work, struct cls_mall_head, | |
50 | work); | |
51 | rtnl_lock(); | |
52 | tcf_exts_destroy(&head->exts); | |
53 | kfree(head); | |
54 | rtnl_unlock(); | |
55 | } | |
56 | ||
fd62d9f5 | 57 | static void mall_destroy_rcu(struct rcu_head *rcu) |
bf3994d2 | 58 | { |
fd62d9f5 YG |
59 | struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, |
60 | rcu); | |
bf3994d2 | 61 | |
df2735ee CW |
62 | INIT_WORK(&head->work, mall_destroy_work); |
63 | tcf_queue_work(&head->work); | |
bf3994d2 JP |
64 | } |
65 | ||
b87f7936 | 66 | static int mall_replace_hw_filter(struct tcf_proto *tp, |
fd62d9f5 | 67 | struct cls_mall_head *head, |
b87f7936 YG |
68 | unsigned long cookie) |
69 | { | |
70 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 71 | struct tc_cls_matchall_offload cls_mall = {}; |
c7d2b2f5 | 72 | int err; |
b87f7936 | 73 | |
de4784ca JP |
74 | tc_cls_common_offload_init(&cls_mall.common, tp); |
75 | cls_mall.command = TC_CLSMATCHALL_REPLACE; | |
76 | cls_mall.exts = &head->exts; | |
77 | cls_mall.cookie = cookie; | |
b87f7936 | 78 | |
ade9b658 | 79 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, |
de4784ca | 80 | &cls_mall); |
c7d2b2f5 OG |
81 | if (!err) |
82 | head->flags |= TCA_CLS_FLAGS_IN_HW; | |
83 | ||
84 | return err; | |
b87f7936 YG |
85 | } |
86 | ||
87 | static void mall_destroy_hw_filter(struct tcf_proto *tp, | |
fd62d9f5 | 88 | struct cls_mall_head *head, |
b87f7936 YG |
89 | unsigned long cookie) |
90 | { | |
91 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 92 | struct tc_cls_matchall_offload cls_mall = {}; |
b87f7936 | 93 | |
de4784ca JP |
94 | tc_cls_common_offload_init(&cls_mall.common, tp); |
95 | cls_mall.command = TC_CLSMATCHALL_DESTROY; | |
96 | cls_mall.cookie = cookie; | |
b87f7936 | 97 | |
de4784ca | 98 | dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, &cls_mall); |
b87f7936 YG |
99 | } |
100 | ||
763dbf63 | 101 | static void mall_destroy(struct tcf_proto *tp) |
bf3994d2 JP |
102 | { |
103 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 | 104 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 | 105 | |
fd62d9f5 | 106 | if (!head) |
763dbf63 | 107 | return; |
bf3994d2 | 108 | |
7b06e8ae | 109 | if (tc_should_offload(dev, head->flags)) |
fd62d9f5 | 110 | mall_destroy_hw_filter(tp, head, (unsigned long) head); |
b87f7936 | 111 | |
fd62d9f5 | 112 | call_rcu(&head->rcu, mall_destroy_rcu); |
bf3994d2 JP |
113 | } |
114 | ||
8113c095 | 115 | static void *mall_get(struct tcf_proto *tp, u32 handle) |
bf3994d2 | 116 | { |
8113c095 | 117 | return NULL; |
bf3994d2 JP |
118 | } |
119 | ||
120 | static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { | |
121 | [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, | |
122 | [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, | |
123 | }; | |
124 | ||
125 | static int mall_set_parms(struct net *net, struct tcf_proto *tp, | |
fd62d9f5 | 126 | struct cls_mall_head *head, |
bf3994d2 JP |
127 | unsigned long base, struct nlattr **tb, |
128 | struct nlattr *est, bool ovr) | |
129 | { | |
bf3994d2 JP |
130 | int err; |
131 | ||
a74cb369 | 132 | err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr); |
bf3994d2 | 133 | if (err < 0) |
a74cb369 | 134 | return err; |
bf3994d2 JP |
135 | |
136 | if (tb[TCA_MATCHALL_CLASSID]) { | |
fd62d9f5 YG |
137 | head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); |
138 | tcf_bind_filter(tp, &head->res, base); | |
bf3994d2 | 139 | } |
bf3994d2 JP |
140 | return 0; |
141 | } | |
142 | ||
143 | static int mall_change(struct net *net, struct sk_buff *in_skb, | |
144 | struct tcf_proto *tp, unsigned long base, | |
145 | u32 handle, struct nlattr **tca, | |
8113c095 | 146 | void **arg, bool ovr) |
bf3994d2 JP |
147 | { |
148 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
b87f7936 | 149 | struct net_device *dev = tp->q->dev_queue->dev; |
bf3994d2 | 150 | struct nlattr *tb[TCA_MATCHALL_MAX + 1]; |
fd62d9f5 | 151 | struct cls_mall_head *new; |
b87f7936 | 152 | u32 flags = 0; |
bf3994d2 JP |
153 | int err; |
154 | ||
155 | if (!tca[TCA_OPTIONS]) | |
156 | return -EINVAL; | |
157 | ||
fd62d9f5 YG |
158 | if (head) |
159 | return -EEXIST; | |
bf3994d2 | 160 | |
fceb6435 JB |
161 | err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], |
162 | mall_policy, NULL); | |
bf3994d2 JP |
163 | if (err < 0) |
164 | return err; | |
165 | ||
b87f7936 YG |
166 | if (tb[TCA_MATCHALL_FLAGS]) { |
167 | flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); | |
168 | if (!tc_flags_valid(flags)) | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
fd62d9f5 YG |
172 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
173 | if (!new) | |
bf3994d2 JP |
174 | return -ENOBUFS; |
175 | ||
e2160156 | 176 | err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); |
ec2507d2 YG |
177 | if (err) |
178 | goto err_exts_init; | |
bf3994d2 JP |
179 | |
180 | if (!handle) | |
181 | handle = 1; | |
fd62d9f5 YG |
182 | new->handle = handle; |
183 | new->flags = flags; | |
bf3994d2 | 184 | |
fd62d9f5 | 185 | err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); |
bf3994d2 | 186 | if (err) |
ec2507d2 | 187 | goto err_set_parms; |
bf3994d2 | 188 | |
7b06e8ae | 189 | if (tc_should_offload(dev, flags)) { |
fd62d9f5 | 190 | err = mall_replace_hw_filter(tp, new, (unsigned long) new); |
b87f7936 YG |
191 | if (err) { |
192 | if (tc_skip_sw(flags)) | |
ec2507d2 | 193 | goto err_replace_hw_filter; |
b87f7936 YG |
194 | else |
195 | err = 0; | |
196 | } | |
197 | } | |
c7d2b2f5 OG |
198 | |
199 | if (!tc_in_hw(new->flags)) | |
200 | new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
b87f7936 | 201 | |
8113c095 | 202 | *arg = head; |
fd62d9f5 | 203 | rcu_assign_pointer(tp->root, new); |
bf3994d2 JP |
204 | return 0; |
205 | ||
ec2507d2 YG |
206 | err_replace_hw_filter: |
207 | err_set_parms: | |
e2160156 | 208 | tcf_exts_destroy(&new->exts); |
ec2507d2 | 209 | err_exts_init: |
fd62d9f5 | 210 | kfree(new); |
bf3994d2 JP |
211 | return err; |
212 | } | |
213 | ||
8113c095 | 214 | static int mall_delete(struct tcf_proto *tp, void *arg, bool *last) |
bf3994d2 | 215 | { |
fd62d9f5 | 216 | return -EOPNOTSUPP; |
bf3994d2 JP |
217 | } |
218 | ||
219 | static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
220 | { | |
221 | struct cls_mall_head *head = rtnl_dereference(tp->root); | |
bf3994d2 JP |
222 | |
223 | if (arg->count < arg->skip) | |
224 | goto skip; | |
8113c095 | 225 | if (arg->fn(tp, head, arg) < 0) |
bf3994d2 JP |
226 | arg->stop = 1; |
227 | skip: | |
228 | arg->count++; | |
229 | } | |
230 | ||
8113c095 | 231 | static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, |
bf3994d2 JP |
232 | struct sk_buff *skb, struct tcmsg *t) |
233 | { | |
8113c095 | 234 | struct cls_mall_head *head = fh; |
bf3994d2 JP |
235 | struct nlattr *nest; |
236 | ||
fd62d9f5 | 237 | if (!head) |
bf3994d2 JP |
238 | return skb->len; |
239 | ||
fd62d9f5 | 240 | t->tcm_handle = head->handle; |
bf3994d2 JP |
241 | |
242 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
243 | if (!nest) | |
244 | goto nla_put_failure; | |
245 | ||
fd62d9f5 YG |
246 | if (head->res.classid && |
247 | nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) | |
bf3994d2 JP |
248 | goto nla_put_failure; |
249 | ||
7a335ada OG |
250 | if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) |
251 | goto nla_put_failure; | |
252 | ||
fd62d9f5 | 253 | if (tcf_exts_dump(skb, &head->exts)) |
bf3994d2 JP |
254 | goto nla_put_failure; |
255 | ||
256 | nla_nest_end(skb, nest); | |
257 | ||
fd62d9f5 | 258 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
bf3994d2 JP |
259 | goto nla_put_failure; |
260 | ||
261 | return skb->len; | |
262 | ||
263 | nla_put_failure: | |
264 | nla_nest_cancel(skb, nest); | |
265 | return -1; | |
266 | } | |
267 | ||
07d79fc7 CW |
268 | static void mall_bind_class(void *fh, u32 classid, unsigned long cl) |
269 | { | |
270 | struct cls_mall_head *head = fh; | |
271 | ||
272 | if (head && head->res.classid == classid) | |
273 | head->res.class = cl; | |
274 | } | |
275 | ||
bf3994d2 JP |
276 | static struct tcf_proto_ops cls_mall_ops __read_mostly = { |
277 | .kind = "matchall", | |
278 | .classify = mall_classify, | |
279 | .init = mall_init, | |
280 | .destroy = mall_destroy, | |
281 | .get = mall_get, | |
282 | .change = mall_change, | |
283 | .delete = mall_delete, | |
284 | .walk = mall_walk, | |
285 | .dump = mall_dump, | |
07d79fc7 | 286 | .bind_class = mall_bind_class, |
bf3994d2 JP |
287 | .owner = THIS_MODULE, |
288 | }; | |
289 | ||
290 | static int __init cls_mall_init(void) | |
291 | { | |
292 | return register_tcf_proto_ops(&cls_mall_ops); | |
293 | } | |
294 | ||
295 | static void __exit cls_mall_exit(void) | |
296 | { | |
297 | unregister_tcf_proto_ops(&cls_mall_ops); | |
298 | } | |
299 | ||
300 | module_init(cls_mall_init); | |
301 | module_exit(cls_mall_exit); | |
302 | ||
303 | MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); | |
304 | MODULE_DESCRIPTION("Match-all classifier"); | |
305 | MODULE_LICENSE("GPL v2"); |