1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation.
3 * Copyright 2013-2014 6WIND S.A.
4 */
5
6 #include <string.h>
7 #include <inttypes.h>
8 #include <stdint.h>
9 #include <stdlib.h>
10 #include <stdio.h>
11 #include <sys/queue.h>
12
13 #include <rte_errno.h>
14 #include <rte_interrupts.h>
15 #include <rte_log.h>
16 #include <rte_bus.h>
17 #include <rte_eal_paging.h>
18 #include <rte_per_lcore.h>
19 #include <rte_memory.h>
20 #include <rte_eal.h>
21 #include <rte_string_fns.h>
22 #include <rte_common.h>
23 #include <rte_debug.h>
24
25 #include "rte_pci.h"
26
27 static inline const char *
get_u8_pciaddr_field(const char * in,void * _u8,char dlm)28 get_u8_pciaddr_field(const char *in, void *_u8, char dlm)
29 {
30 unsigned long val;
31 uint8_t *u8 = _u8;
32 char *end;
33
34 /* empty string is an error though strtoul() returns 0 */
35 if (*in == '\0')
36 return NULL;
37
38 /* PCI field starting with spaces is forbidden.
39 * Negative wrap-around is not reported as an error by strtoul.
40 */
41 if (*in == ' ' || *in == '-')
42 return NULL;
43
44 errno = 0;
45 val = strtoul(in, &end, 16);
46 if (errno != 0 || end[0] != dlm || val > UINT8_MAX) {
47 errno = errno ? errno : EINVAL;
48 return NULL;
49 }
50 *u8 = (uint8_t)val;
51 return end + 1;
52 }
53
54 static int
pci_bdf_parse(const char * input,struct rte_pci_addr * dev_addr)55 pci_bdf_parse(const char *input, struct rte_pci_addr *dev_addr)
56 {
57 const char *in = input;
58
59 dev_addr->domain = 0;
60 in = get_u8_pciaddr_field(in, &dev_addr->bus, ':');
61 if (in == NULL)
62 return -EINVAL;
63 in = get_u8_pciaddr_field(in, &dev_addr->devid, '.');
64 if (in == NULL)
65 return -EINVAL;
66 in = get_u8_pciaddr_field(in, &dev_addr->function, '\0');
67 if (in == NULL)
68 return -EINVAL;
69 return 0;
70 }
71
72 static int
pci_dbdf_parse(const char * input,struct rte_pci_addr * dev_addr)73 pci_dbdf_parse(const char *input, struct rte_pci_addr *dev_addr)
74 {
75 const char *in = input;
76 unsigned long val;
77 char *end;
78
79 /* PCI id starting with spaces is forbidden.
80 * Negative wrap-around is not reported as an error by strtoul.
81 */
82 if (*in == ' ' || *in == '-')
83 return -EINVAL;
84
85 errno = 0;
86 val = strtoul(in, &end, 16);
87 /* Empty string is not an error for strtoul, but the check
88 * end[0] != ':'
89 * will detect the issue.
90 */
91 if (errno != 0 || end[0] != ':' || val > UINT32_MAX)
92 return -EINVAL;
93 dev_addr->domain = (uint32_t)val;
94 in = end + 1;
95 in = get_u8_pciaddr_field(in, &dev_addr->bus, ':');
96 if (in == NULL)
97 return -EINVAL;
98 in = get_u8_pciaddr_field(in, &dev_addr->devid, '.');
99 if (in == NULL)
100 return -EINVAL;
101 in = get_u8_pciaddr_field(in, &dev_addr->function, '\0');
102 if (in == NULL)
103 return -EINVAL;
104 return 0;
105 }
106
107 void
rte_pci_device_name(const struct rte_pci_addr * addr,char * output,size_t size)108 rte_pci_device_name(const struct rte_pci_addr *addr,
109 char *output, size_t size)
110 {
111 RTE_VERIFY(size >= PCI_PRI_STR_SIZE);
112 RTE_VERIFY(snprintf(output, size, PCI_PRI_FMT,
113 addr->domain, addr->bus,
114 addr->devid, addr->function) >= 0);
115 }
116
117 int
rte_pci_addr_cmp(const struct rte_pci_addr * addr,const struct rte_pci_addr * addr2)118 rte_pci_addr_cmp(const struct rte_pci_addr *addr,
119 const struct rte_pci_addr *addr2)
120 {
121 uint64_t dev_addr, dev_addr2;
122
123 if ((addr == NULL) || (addr2 == NULL))
124 return -1;
125
126 dev_addr = ((uint64_t)addr->domain << 24) |
127 (addr->bus << 16) | (addr->devid << 8) | addr->function;
128 dev_addr2 = ((uint64_t)addr2->domain << 24) |
129 (addr2->bus << 16) | (addr2->devid << 8) | addr2->function;
130
131 if (dev_addr > dev_addr2)
132 return 1;
133 else if (dev_addr < dev_addr2)
134 return -1;
135 else
136 return 0;
137 }
138
139 int
rte_pci_addr_parse(const char * str,struct rte_pci_addr * addr)140 rte_pci_addr_parse(const char *str, struct rte_pci_addr *addr)
141 {
142 if (pci_bdf_parse(str, addr) == 0 ||
143 pci_dbdf_parse(str, addr) == 0)
144 return 0;
145 return -1;
146 }
147