1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
3 */
4
5 #include <sys/queue.h>
6 #include <stdio.h>
7 #include <string.h>
8
9 #include <rte_eal.h>
10 #include <rte_eal_memconfig.h>
11 #include <rte_log.h>
12 #include <rte_string_fns.h>
13
14 #include "eal_private.h"
15 #include "eal_memcfg.h"
16
17 TAILQ_HEAD(rte_tailq_elem_head, rte_tailq_elem);
18 /* local tailq list */
19 static struct rte_tailq_elem_head rte_tailq_elem_head =
20 TAILQ_HEAD_INITIALIZER(rte_tailq_elem_head);
21
22 /* number of tailqs registered, -1 before call to rte_eal_tailqs_init */
23 static int rte_tailqs_count = -1;
24
25 struct rte_tailq_head *
rte_eal_tailq_lookup(const char * name)26 rte_eal_tailq_lookup(const char *name)
27 {
28 unsigned i;
29 struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
30
31 if (name == NULL)
32 return NULL;
33
34 for (i = 0; i < RTE_MAX_TAILQ; i++) {
35 if (!strncmp(name, mcfg->tailq_head[i].name,
36 RTE_TAILQ_NAMESIZE-1))
37 return &mcfg->tailq_head[i];
38 }
39
40 return NULL;
41 }
42
43 void
rte_dump_tailq(FILE * f)44 rte_dump_tailq(FILE *f)
45 {
46 struct rte_mem_config *mcfg;
47 unsigned i = 0;
48
49 mcfg = rte_eal_get_configuration()->mem_config;
50
51 rte_mcfg_tailq_read_lock();
52 for (i = 0; i < RTE_MAX_TAILQ; i++) {
53 const struct rte_tailq_head *tailq = &mcfg->tailq_head[i];
54 const struct rte_tailq_entry_head *head = &tailq->tailq_head;
55
56 fprintf(f, "Tailq %u: qname:<%s>, tqh_first:%p, tqh_last:%p\n",
57 i, tailq->name, head->tqh_first, head->tqh_last);
58 }
59 rte_mcfg_tailq_read_unlock();
60 }
61
62 static struct rte_tailq_head *
rte_eal_tailq_create(const char * name)63 rte_eal_tailq_create(const char *name)
64 {
65 struct rte_tailq_head *head = NULL;
66
67 if (!rte_eal_tailq_lookup(name) &&
68 (rte_tailqs_count + 1 < RTE_MAX_TAILQ)) {
69 struct rte_mem_config *mcfg;
70
71 mcfg = rte_eal_get_configuration()->mem_config;
72 head = &mcfg->tailq_head[rte_tailqs_count];
73 strlcpy(head->name, name, sizeof(head->name) - 1);
74 TAILQ_INIT(&head->tailq_head);
75 rte_tailqs_count++;
76 }
77
78 return head;
79 }
80
81 /* local register, used to store "early" tailqs before rte_eal_init() and to
82 * ensure secondary process only registers tailqs once. */
83 static int
rte_eal_tailq_local_register(struct rte_tailq_elem * t)84 rte_eal_tailq_local_register(struct rte_tailq_elem *t)
85 {
86 struct rte_tailq_elem *temp;
87
88 TAILQ_FOREACH(temp, &rte_tailq_elem_head, next) {
89 if (!strncmp(t->name, temp->name, sizeof(temp->name)))
90 return -1;
91 }
92
93 TAILQ_INSERT_TAIL(&rte_tailq_elem_head, t, next);
94 return 0;
95 }
96
97 static void
rte_eal_tailq_update(struct rte_tailq_elem * t)98 rte_eal_tailq_update(struct rte_tailq_elem *t)
99 {
100 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
101 /* primary process is the only one that creates */
102 t->head = rte_eal_tailq_create(t->name);
103 } else {
104 t->head = rte_eal_tailq_lookup(t->name);
105 }
106 }
107
108 int
rte_eal_tailq_register(struct rte_tailq_elem * t)109 rte_eal_tailq_register(struct rte_tailq_elem *t)
110 {
111 if (rte_eal_tailq_local_register(t) < 0) {
112 EAL_LOG(ERR,
113 "%s tailq is already registered", t->name);
114 goto error;
115 }
116
117 /* if a register happens after rte_eal_tailqs_init(), then we can update
118 * tailq head */
119 if (rte_tailqs_count >= 0) {
120 rte_eal_tailq_update(t);
121 if (t->head == NULL) {
122 EAL_LOG(ERR,
123 "Cannot initialize tailq: %s", t->name);
124 TAILQ_REMOVE(&rte_tailq_elem_head, t, next);
125 goto error;
126 }
127 }
128
129 return 0;
130
131 error:
132 t->head = NULL;
133 return -1;
134 }
135
136 int
rte_eal_tailqs_init(void)137 rte_eal_tailqs_init(void)
138 {
139 struct rte_tailq_elem *t;
140
141 rte_tailqs_count = 0;
142
143 TAILQ_FOREACH(t, &rte_tailq_elem_head, next) {
144 /* second part of register job for "early" tailqs, see
145 * rte_eal_tailq_register and EAL_REGISTER_TAILQ */
146 rte_eal_tailq_update(t);
147 if (t->head == NULL) {
148 EAL_LOG(ERR,
149 "Cannot initialize tailq: %s", t->name);
150 /* TAILQ_REMOVE not needed, error is already fatal */
151 goto fail;
152 }
153 }
154
155 return 0;
156
157 fail:
158 rte_dump_tailq(stderr);
159 return -1;
160 }
161