summaryrefslogtreecommitdiff
path: root/include/net/tcx.h
blob: 04be9377785d77956c063f900cbee2bbadba0f5e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2023 Isovalent */
#ifndef __NET_TCX_H
#define __NET_TCX_H

#include <linux/bpf.h>
#include <linux/bpf_mprog.h>

#include <net/sch_generic.h>

struct mini_Qdisc;

struct tcx_entry {
	struct mini_Qdisc __rcu *miniq;
	struct bpf_mprog_bundle bundle;
	bool miniq_active;
	struct rcu_head rcu;
};

struct tcx_link {
	struct bpf_link link;
	struct net_device *dev;
	u32 location;
};

static inline void tcx_set_ingress(struct sk_buff *skb, bool ingress)
{
#ifdef CONFIG_NET_XGRESS
	skb->tc_at_ingress = ingress;
#endif
}

#ifdef CONFIG_NET_XGRESS
static inline struct tcx_entry *tcx_entry(struct bpf_mprog_entry *entry)
{
	struct bpf_mprog_bundle *bundle = entry->parent;

	return container_of(bundle, struct tcx_entry, bundle);
}

static inline struct tcx_link *tcx_link(const struct bpf_link *link)
{
	return container_of(link, struct tcx_link, link);
}

void tcx_inc(void);
void tcx_dec(void);

static inline void tcx_entry_sync(void)
{
	/* bpf_mprog_entry got a/b swapped, therefore ensure that
	 * there are no inflight users on the old one anymore.
	 */
	synchronize_rcu();
}

static inline void
tcx_entry_update(struct net_device *dev, struct bpf_mprog_entry *entry,
		 bool ingress)
{
	ASSERT_RTNL();
	if (ingress)
		rcu_assign_pointer(dev->tcx_ingress, entry);
	else
		rcu_assign_pointer(dev->tcx_egress, entry);
}

static inline struct bpf_mprog_entry *
tcx_entry_fetch(struct net_device *dev, bool ingress)
{
	ASSERT_RTNL();
	if (ingress)
		return rcu_dereference_rtnl(dev->tcx_ingress);
	else
		return rcu_dereference_rtnl(dev->tcx_egress);
}

static inline struct bpf_mprog_entry *tcx_entry_create(void)
{
	struct tcx_entry *tcx = kzalloc(sizeof(*tcx), GFP_KERNEL);

	if (tcx) {
		bpf_mprog_bundle_init(&tcx->bundle);
		return &tcx->bundle.a;
	}
	return NULL;
}

static inline void tcx_entry_free(struct bpf_mprog_entry *entry)
{
	kfree_rcu(tcx_entry(entry), rcu);
}

static inline struct bpf_mprog_entry *
tcx_entry_fetch_or_create(struct net_device *dev, bool ingress, bool *created)
{
	struct bpf_mprog_entry *entry = tcx_entry_fetch(dev, ingress);

	*created = false;
	if (!entry) {
		entry = tcx_entry_create();
		if (!entry)
			return NULL;
		*created = true;
	}
	return entry;
}

static inline void tcx_skeys_inc(bool ingress)
{
	tcx_inc();
	if (ingress)
		net_inc_ingress_queue();
	else
		net_inc_egress_queue();
}

static inline void tcx_skeys_dec(bool ingress)
{
	if (ingress)
		net_dec_ingress_queue();
	else
		net_dec_egress_queue();
	tcx_dec();
}

static inline void tcx_miniq_set_active(struct bpf_mprog_entry *entry,
					const bool active)
{
	ASSERT_RTNL();
	tcx_entry(entry)->miniq_active = active;
}

static inline bool tcx_entry_is_active(struct bpf_mprog_entry *entry)
{
	ASSERT_RTNL();
	return bpf_mprog_total(entry) || tcx_entry(entry)->miniq_active;
}

static inline enum tcx_action_base tcx_action_code(struct sk_buff *skb,
						   int code)
{
	switch (code) {
	case TCX_PASS:
		skb->tc_index = qdisc_skb_cb(skb)->tc_classid;
		fallthrough;
	case TCX_DROP:
	case TCX_REDIRECT:
		return code;
	case TCX_NEXT:
	default:
		return TCX_NEXT;
	}
}
#endif /* CONFIG_NET_XGRESS */

#if defined(CONFIG_NET_XGRESS) && defined(CONFIG_BPF_SYSCALL)
int tcx_prog_attach(const union bpf_attr *attr, struct bpf_prog *prog);
int tcx_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
int tcx_prog_detach(const union bpf_attr *attr, struct bpf_prog *prog);
void tcx_uninstall(struct net_device *dev, bool ingress);

int tcx_prog_query(const union bpf_attr *attr,
		   union bpf_attr __user *uattr);

static inline void dev_tcx_uninstall(struct net_device *dev)
{
	ASSERT_RTNL();
	tcx_uninstall(dev, true);
	tcx_uninstall(dev, false);
}
#else
static inline int tcx_prog_attach(const union bpf_attr *attr,
				  struct bpf_prog *prog)
{
	return -EINVAL;
}

static inline int tcx_link_attach(const union bpf_attr *attr,
				  struct bpf_prog *prog)
{
	return -EINVAL;
}

static inline int tcx_prog_detach(const union bpf_attr *attr,
				  struct bpf_prog *prog)
{
	return -EINVAL;
}

static inline int tcx_prog_query(const union bpf_attr *attr,
				 union bpf_attr __user *uattr)
{
	return -EINVAL;
}

static inline void dev_tcx_uninstall(struct net_device *dev)
{
}
#endif /* CONFIG_NET_XGRESS && CONFIG_BPF_SYSCALL */
#endif /* __NET_TCX_H */