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Vector Packet Processing
spp_timers.h
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1 /*
2  *------------------------------------------------------------------
3  * spp_timers.h
4  *
5  * Copyright (c) 2008-2009 Cisco and/or its affiliates.
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at:
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  *------------------------------------------------------------------
18  */
19 #ifndef __SPP_TIMERS_H__
20 #define __SPP_TIMERS_H__
21 
22 
23 typedef struct d_list_el_ {
24  struct d_list_el_ *next;
25  struct d_list_el_ *prev;
26 } d_list_el_t;
27 
28 /*
29  * d_list_init
30  */
31 
32 static inline void d_list_init (d_list_el_t *headp)
33 {
34  headp->prev = headp->next = headp;
35 }
36 
37 /*
38  * d_list_init - add at head of list
39  */
40 
41 static inline void d_list_add_head (d_list_el_t *headp,
42  d_list_el_t *elp)
43 {
44  ASSERT(elp->prev == elp); /* multiple enqueue, BAD! */
45  ASSERT(elp->next == elp);
46 
47  elp->next = headp->next;
48  headp->next = elp;
49  elp->prev = elp->next->prev;
50  elp->next->prev = elp;
51 }
52 
53 /*
54  * d_list_add_tail - add element at tail of list
55  */
56 static inline void d_list_add_tail (d_list_el_t *headp,
57  d_list_el_t *elp)
58 {
59  ASSERT(elp->prev == elp); /* multiple enqueue, BAD! */
60  ASSERT(elp->next == elp);
61 
62  headp = headp->prev;
63 
64  elp->next = headp->next;
65  headp->next = elp;
66  elp->prev = elp->next->prev;
67  elp->next->prev = elp;
68 }
69 
70 /*
71  * d_list_rem_head - removes first element from list
72  */
73 static inline d_list_el_t *d_list_rem_head (d_list_el_t *headp)
74 {
75  d_list_el_t *elp;
76 
77  elp = headp->next;
78  if (elp == headp)
79  return (NULL);
80  headp->next = elp->next;
81  elp->next->prev = elp->prev;
82 
83  elp->next = elp->prev = elp;
84  return (elp);
85 }
86 
87 /*
88  * d_list_rem_elem - removes specific element from list.
89  */
90 static inline void d_list_rem_elem (d_list_el_t *elp)
91 {
92  d_list_el_t *headp;
93 
94  headp = elp->prev;
95 
96  headp->next = elp->next;
97  elp->next->prev = elp->prev;
98  elp->next = elp->prev = elp;
99 }
100 
101 #define TIMER_BKTS_PER_WHEEL 128 /* power of 2, please */
102 #define TIMER_NWHEELS 4
103 
104 typedef struct {
105  i32 curindex; /* current index for this wheel */
106  d_list_el_t *bkts; /* vector of bucket listheads */
108 
109 
110 typedef struct {
111  u64 next_run_ticks; /* Next time we expire timers */
112  spp_timer_wheel_t **wheels; /* pointers to wheels */
114 
115 
116 typedef struct {
121 } spp_timer_t;
122 
123 #define SPP_TIMER_RUNNING 0x0001
124 
125 
126 /*
127  * prototypes
128  */
131 void spp_timer_expire(spp_timer_axle_t *ta, u64 now);
132 void spp_timer_final_init(void);
133 
134 void spp_timer_start(spp_timer_t *tp);
136 void spp_timer_stop(spp_timer_t *tp);
138 
139 #endif /* __SPP_TIMERS_H__ */
u16 spp_timer_register_callback(void(*fp)(spp_timer_t *))
struct d_list_el_ * prev
Definition: spp_timers.h:25
static void d_list_init(d_list_el_t *headp)
Definition: spp_timers.h:32
void spp_timer_start_axle(spp_timer_axle_t *ta, spp_timer_t *tp)
#define NULL
Definition: clib.h:55
struct d_list_el_ d_list_el_t
void spp_timer_stop(spp_timer_t *tp)
static void d_list_rem_elem(d_list_el_t *elp)
Definition: spp_timers.h:90
int i32
Definition: types.h:81
unsigned long u64
Definition: types.h:89
static d_list_el_t * d_list_rem_head(d_list_el_t *headp)
Definition: spp_timers.h:73
static void d_list_add_head(d_list_el_t *headp, d_list_el_t *elp)
Definition: spp_timers.h:41
void spp_timer_start(spp_timer_t *tp)
void spp_timer_set_ticks_per_ms(u64)
d_list_el_t * bkts
Definition: spp_timers.h:106
void spp_timer_axle_init(spp_timer_axle_t *ta)
#define ASSERT(truth)
d_list_el_t el
Definition: spp_timers.h:117
unsigned short u16
Definition: types.h:57
void spp_timer_final_init(void)
spp_timer_wheel_t ** wheels
Definition: spp_timers.h:112
static void d_list_add_tail(d_list_el_t *headp, d_list_el_t *elp)
Definition: spp_timers.h:56
void spp_timer_expire(spp_timer_axle_t *ta, u64 now)
struct d_list_el_ * next
Definition: spp_timers.h:24