1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef __NET_SCHED_PIE_H 2 #ifndef __NET_SCHED_PIE_H
3 #define __NET_SCHED_PIE_H 3 #define __NET_SCHED_PIE_H
4 4
5 #include <linux/ktime.h> 5 #include <linux/ktime.h>
6 #include <linux/skbuff.h> 6 #include <linux/skbuff.h>
7 #include <linux/types.h> 7 #include <linux/types.h>
8 #include <net/inet_ecn.h> 8 #include <net/inet_ecn.h>
9 #include <net/pkt_sched.h> 9 #include <net/pkt_sched.h>
10 10
11 #define MAX_PROB (U64_MAX >> BITS_PER_B 11 #define MAX_PROB (U64_MAX >> BITS_PER_BYTE)
12 #define DTIME_INVALID U64_MAX 12 #define DTIME_INVALID U64_MAX
13 #define QUEUE_THRESHOLD 16384 13 #define QUEUE_THRESHOLD 16384
14 #define DQCOUNT_INVALID -1 14 #define DQCOUNT_INVALID -1
15 #define PIE_SCALE 8 15 #define PIE_SCALE 8
16 16
17 /** 17 /**
18 * struct pie_params - contains pie parameters 18 * struct pie_params - contains pie parameters
19 * @target: target delay in psched 19 * @target: target delay in pschedtime
20 * @tupdate: interval at which drop 20 * @tupdate: interval at which drop probability is calculated
21 * @limit: total number of packet 21 * @limit: total number of packets that can be in the queue
22 * @alpha: parameter to control d 22 * @alpha: parameter to control drop probability
23 * @beta: parameter to control d 23 * @beta: parameter to control drop probability
24 * @ecn: is ECN marking of pack 24 * @ecn: is ECN marking of packets enabled
25 * @bytemode: is drop probability sc 25 * @bytemode: is drop probability scaled based on pkt size
26 * @dq_rate_estimator: is Little's law used f 26 * @dq_rate_estimator: is Little's law used for qdelay calculation
27 */ 27 */
28 struct pie_params { 28 struct pie_params {
29 psched_time_t target; 29 psched_time_t target;
30 u32 tupdate; 30 u32 tupdate;
31 u32 limit; 31 u32 limit;
32 u32 alpha; 32 u32 alpha;
33 u32 beta; 33 u32 beta;
34 u8 ecn; 34 u8 ecn;
35 u8 bytemode; 35 u8 bytemode;
36 u8 dq_rate_estimator; 36 u8 dq_rate_estimator;
37 }; 37 };
38 38
39 /** 39 /**
40 * struct pie_vars - contains pie variables 40 * struct pie_vars - contains pie variables
41 * @qdelay: current queue delay 41 * @qdelay: current queue delay
42 * @qdelay_old: queue delay in previou 42 * @qdelay_old: queue delay in previous qdelay calculation
43 * @burst_time: burst time allowance 43 * @burst_time: burst time allowance
44 * @dq_tstamp: timestamp at which dq 44 * @dq_tstamp: timestamp at which dq rate was last calculated
45 * @prob: drop probability 45 * @prob: drop probability
46 * @accu_prob: accumulated drop proba 46 * @accu_prob: accumulated drop probability
47 * @dq_count: number of bytes dequeu 47 * @dq_count: number of bytes dequeued in a measurement cycle
48 * @avg_dq_rate: calculated average dq 48 * @avg_dq_rate: calculated average dq rate
49 * @backlog_old: queue backlog during p 49 * @backlog_old: queue backlog during previous qdelay calculation
50 */ 50 */
51 struct pie_vars { 51 struct pie_vars {
52 psched_time_t qdelay; 52 psched_time_t qdelay;
53 psched_time_t qdelay_old; 53 psched_time_t qdelay_old;
54 psched_time_t burst_time; 54 psched_time_t burst_time;
55 psched_time_t dq_tstamp; 55 psched_time_t dq_tstamp;
56 u64 prob; 56 u64 prob;
57 u64 accu_prob; 57 u64 accu_prob;
58 u64 dq_count; 58 u64 dq_count;
59 u32 avg_dq_rate; 59 u32 avg_dq_rate;
60 u32 backlog_old; 60 u32 backlog_old;
61 }; 61 };
62 62
63 /** 63 /**
64 * struct pie_stats - contains pie stats 64 * struct pie_stats - contains pie stats
65 * @packets_in: total number of packets enqueu 65 * @packets_in: total number of packets enqueued
66 * @dropped: packets dropped due to pie act 66 * @dropped: packets dropped due to pie action
67 * @overlimit: packets dropped due to lack of 67 * @overlimit: packets dropped due to lack of space in queue
68 * @ecn_mark: packets marked with ECN 68 * @ecn_mark: packets marked with ECN
69 * @maxq: maximum queue size 69 * @maxq: maximum queue size
70 */ 70 */
71 struct pie_stats { 71 struct pie_stats {
72 u32 packets_in; 72 u32 packets_in;
73 u32 dropped; 73 u32 dropped;
74 u32 overlimit; 74 u32 overlimit;
75 u32 ecn_mark; 75 u32 ecn_mark;
76 u32 maxq; 76 u32 maxq;
77 }; 77 };
78 78
79 /** 79 /**
80 * struct pie_skb_cb - contains private skb va 80 * struct pie_skb_cb - contains private skb vars
81 * @enqueue_time: timestamp when the pac 81 * @enqueue_time: timestamp when the packet is enqueued
82 * @mem_usage: size of the skb during 82 * @mem_usage: size of the skb during enqueue
83 */ 83 */
84 struct pie_skb_cb { 84 struct pie_skb_cb {
85 psched_time_t enqueue_time; 85 psched_time_t enqueue_time;
86 u32 mem_usage; 86 u32 mem_usage;
87 }; 87 };
88 88
89 static inline void pie_params_init(struct pie_ 89 static inline void pie_params_init(struct pie_params *params)
90 { 90 {
91 params->target = PSCHED_NS2TICKS(15 * 91 params->target = PSCHED_NS2TICKS(15 * NSEC_PER_MSEC); /* 15 ms */
92 params->tupdate = usecs_to_jiffies(15 92 params->tupdate = usecs_to_jiffies(15 * USEC_PER_MSEC); /* 15 ms */
93 params->limit = 1000; 93 params->limit = 1000;
94 params->alpha = 2; 94 params->alpha = 2;
95 params->beta = 20; 95 params->beta = 20;
96 params->ecn = false; 96 params->ecn = false;
97 params->bytemode = false; 97 params->bytemode = false;
98 params->dq_rate_estimator = false; 98 params->dq_rate_estimator = false;
99 } 99 }
100 100
101 static inline void pie_vars_init(struct pie_va 101 static inline void pie_vars_init(struct pie_vars *vars)
102 { 102 {
103 vars->burst_time = PSCHED_NS2TICKS(150 103 vars->burst_time = PSCHED_NS2TICKS(150 * NSEC_PER_MSEC); /* 150 ms */
104 vars->dq_tstamp = DTIME_INVALID; 104 vars->dq_tstamp = DTIME_INVALID;
105 vars->accu_prob = 0; 105 vars->accu_prob = 0;
106 vars->dq_count = DQCOUNT_INVALID; 106 vars->dq_count = DQCOUNT_INVALID;
107 vars->avg_dq_rate = 0; 107 vars->avg_dq_rate = 0;
108 } 108 }
109 109
110 static inline struct pie_skb_cb *get_pie_cb(co 110 static inline struct pie_skb_cb *get_pie_cb(const struct sk_buff *skb)
111 { 111 {
112 qdisc_cb_private_validate(skb, sizeof( 112 qdisc_cb_private_validate(skb, sizeof(struct pie_skb_cb));
113 return (struct pie_skb_cb *)qdisc_skb_ 113 return (struct pie_skb_cb *)qdisc_skb_cb(skb)->data;
114 } 114 }
115 115
116 static inline psched_time_t pie_get_enqueue_ti 116 static inline psched_time_t pie_get_enqueue_time(const struct sk_buff *skb)
117 { 117 {
118 return get_pie_cb(skb)->enqueue_time; 118 return get_pie_cb(skb)->enqueue_time;
119 } 119 }
120 120
121 static inline void pie_set_enqueue_time(struct 121 static inline void pie_set_enqueue_time(struct sk_buff *skb)
122 { 122 {
123 get_pie_cb(skb)->enqueue_time = psched 123 get_pie_cb(skb)->enqueue_time = psched_get_time();
124 } 124 }
125 125
126 bool pie_drop_early(struct Qdisc *sch, struct 126 bool pie_drop_early(struct Qdisc *sch, struct pie_params *params,
127 struct pie_vars *vars, u32 127 struct pie_vars *vars, u32 backlog, u32 packet_size);
128 128
129 void pie_process_dequeue(struct sk_buff *skb, 129 void pie_process_dequeue(struct sk_buff *skb, struct pie_params *params,
130 struct pie_vars *vars 130 struct pie_vars *vars, u32 backlog);
131 131
132 void pie_calculate_probability(struct pie_para 132 void pie_calculate_probability(struct pie_params *params, struct pie_vars *vars,
133 u32 backlog); 133 u32 backlog);
134 134
135 #endif 135 #endif
136 136
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