1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __NET_PKT_SCHED_H |
3 | #define __NET_PKT_SCHED_H |
4 | |
5 | #include <linux/jiffies.h> |
6 | #include <linux/ktime.h> |
7 | #include <linux/if_vlan.h> |
8 | #include <linux/netdevice.h> |
9 | #include <net/sch_generic.h> |
10 | #include <net/net_namespace.h> |
11 | #include <uapi/linux/pkt_sched.h> |
12 | |
13 | #define DEFAULT_TX_QUEUE_LEN 1000 |
14 | #define STAB_SIZE_LOG_MAX 30 |
15 | |
16 | struct qdisc_walker { |
17 | int stop; |
18 | int skip; |
19 | int count; |
20 | int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); |
21 | }; |
22 | |
23 | static inline void *qdisc_priv(struct Qdisc *q) |
24 | { |
25 | return &q->privdata; |
26 | } |
27 | |
28 | static inline struct Qdisc *qdisc_from_priv(void *priv) |
29 | { |
30 | return container_of(priv, struct Qdisc, privdata); |
31 | } |
32 | |
33 | /* |
34 | Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth |
35 | |
36 | Normal IP packet size ~ 512byte, hence: |
37 | |
38 | 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for |
39 | 10Mbit ethernet. |
40 | |
41 | 10msec resolution -> <50Kbit/sec. |
42 | |
43 | The result: [34]86 is not good choice for QoS router :-( |
44 | |
45 | The things are not so bad, because we may use artificial |
46 | clock evaluated by integration of network data flow |
47 | in the most critical places. |
48 | */ |
49 | |
50 | typedef u64 psched_time_t; |
51 | typedef long psched_tdiff_t; |
52 | |
53 | /* Avoid doing 64 bit divide */ |
54 | #define PSCHED_SHIFT 6 |
55 | #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) |
56 | #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) |
57 | |
58 | #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) |
59 | #define PSCHED_PASTPERFECT 0 |
60 | |
61 | static inline psched_time_t psched_get_time(void) |
62 | { |
63 | return PSCHED_NS2TICKS(ktime_get_ns()); |
64 | } |
65 | |
66 | struct qdisc_watchdog { |
67 | u64 last_expires; |
68 | struct hrtimer timer; |
69 | struct Qdisc *qdisc; |
70 | }; |
71 | |
72 | void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, |
73 | clockid_t clockid); |
74 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); |
75 | |
76 | void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, |
77 | u64 delta_ns); |
78 | |
79 | static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, |
80 | u64 expires) |
81 | { |
82 | return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL); |
83 | } |
84 | |
85 | static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, |
86 | psched_time_t expires) |
87 | { |
88 | qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); |
89 | } |
90 | |
91 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); |
92 | |
93 | extern struct Qdisc_ops pfifo_qdisc_ops; |
94 | extern struct Qdisc_ops bfifo_qdisc_ops; |
95 | extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; |
96 | |
97 | int fifo_set_limit(struct Qdisc *q, unsigned int limit); |
98 | struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, |
99 | unsigned int limit, |
100 | struct netlink_ext_ack *extack); |
101 | |
102 | int register_qdisc(struct Qdisc_ops *qops); |
103 | int unregister_qdisc(struct Qdisc_ops *qops); |
104 | void qdisc_get_default(char *id, size_t len); |
105 | int qdisc_set_default(const char *id); |
106 | |
107 | void qdisc_hash_add(struct Qdisc *q, bool invisible); |
108 | void qdisc_hash_del(struct Qdisc *q); |
109 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); |
110 | struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle); |
111 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
112 | struct nlattr *tab, |
113 | struct netlink_ext_ack *extack); |
114 | void qdisc_put_rtab(struct qdisc_rate_table *tab); |
115 | void qdisc_put_stab(struct qdisc_size_table *tab); |
116 | void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); |
117 | bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
118 | struct net_device *dev, struct netdev_queue *txq, |
119 | spinlock_t *root_lock, bool validate); |
120 | |
121 | void __qdisc_run(struct Qdisc *q); |
122 | |
123 | static inline void qdisc_run(struct Qdisc *q) |
124 | { |
125 | if (qdisc_run_begin(q)) { |
126 | __qdisc_run(q); |
127 | qdisc_run_end(q); |
128 | } |
129 | } |
130 | |
131 | /* Calculate maximal size of packet seen by hard_start_xmit |
132 | routine of this device. |
133 | */ |
134 | static inline unsigned int psched_mtu(const struct net_device *dev) |
135 | { |
136 | return dev->mtu + dev->hard_header_len; |
137 | } |
138 | |
139 | static inline struct net *qdisc_net(struct Qdisc *q) |
140 | { |
141 | return dev_net(q->dev_queue->dev); |
142 | } |
143 | |
144 | struct tc_cbs_qopt_offload { |
145 | u8 enable; |
146 | s32 queue; |
147 | s32 hicredit; |
148 | s32 locredit; |
149 | s32 idleslope; |
150 | s32 sendslope; |
151 | }; |
152 | |
153 | struct tc_etf_qopt_offload { |
154 | u8 enable; |
155 | s32 queue; |
156 | }; |
157 | |
158 | struct tc_taprio_sched_entry { |
159 | u8 command; /* TC_TAPRIO_CMD_* */ |
160 | |
161 | /* The gate_mask in the offloading side refers to traffic classes */ |
162 | u32 gate_mask; |
163 | u32 interval; |
164 | }; |
165 | |
166 | struct tc_taprio_qopt_offload { |
167 | u8 enable; |
168 | ktime_t base_time; |
169 | u64 cycle_time; |
170 | u64 cycle_time_extension; |
171 | |
172 | size_t num_entries; |
173 | struct tc_taprio_sched_entry entries[]; |
174 | }; |
175 | |
176 | #if IS_ENABLED(CONFIG_NET_SCH_TAPRIO) |
177 | |
178 | /* Reference counting */ |
179 | struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload |
180 | *offload); |
181 | void taprio_offload_free(struct tc_taprio_qopt_offload *offload); |
182 | |
183 | #else |
184 | |
185 | /* Reference counting */ |
186 | static inline struct tc_taprio_qopt_offload * |
187 | taprio_offload_get(struct tc_taprio_qopt_offload *offload) |
188 | { |
189 | return NULL; |
190 | } |
191 | |
192 | static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload) |
193 | { |
194 | } |
195 | |
196 | #endif |
197 | |
198 | /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is |
199 | * not mistaken for a software timestamp, because this will otherwise prevent |
200 | * the dispatch of hardware timestamps to the socket. |
201 | */ |
202 | static inline void skb_txtime_consumed(struct sk_buff *skb) |
203 | { |
204 | skb->tstamp = ktime_set(0, 0); |
205 | } |
206 | |
207 | struct tc_skb_cb { |
208 | struct qdisc_skb_cb qdisc_cb; |
209 | |
210 | u16 mru; |
211 | u8 post_ct:1; |
212 | u8 post_ct_snat:1; |
213 | u8 post_ct_dnat:1; |
214 | u16 zone; /* Only valid if post_ct = true */ |
215 | }; |
216 | |
217 | static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) |
218 | { |
219 | struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; |
220 | |
221 | BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); |
222 | return cb; |
223 | } |
224 | |
225 | #endif |
226 | |