common/mlx5: fix build without dlopen option
[dpdk.git] / drivers / common / mlx5 / mlx5_common.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright 2019 Mellanox Technologies, Ltd
3  */
4
5 #include <unistd.h>
6 #include <string.h>
7 #include <stdio.h>
8 #ifdef RTE_IBVERBS_LINK_DLOPEN
9 #include <dlfcn.h>
10 #endif
11
12 #include <rte_errno.h>
13
14 #include "mlx5_common.h"
15 #include "mlx5_common_utils.h"
16 #include "mlx5_glue.h"
17
18
19 int mlx5_common_logtype;
20
21
22 /**
23  * Get PCI information by sysfs device path.
24  *
25  * @param dev_path
26  *   Pointer to device sysfs folder name.
27  * @param[out] pci_addr
28  *   PCI bus address output buffer.
29  *
30  * @return
31  *   0 on success, a negative errno value otherwise and rte_errno is set.
32  */
33 int
34 mlx5_dev_to_pci_addr(const char *dev_path,
35                      struct rte_pci_addr *pci_addr)
36 {
37         FILE *file;
38         char line[32];
39         MKSTR(path, "%s/device/uevent", dev_path);
40
41         file = fopen(path, "rb");
42         if (file == NULL) {
43                 rte_errno = errno;
44                 return -rte_errno;
45         }
46         while (fgets(line, sizeof(line), file) == line) {
47                 size_t len = strlen(line);
48                 int ret;
49
50                 /* Truncate long lines. */
51                 if (len == (sizeof(line) - 1))
52                         while (line[(len - 1)] != '\n') {
53                                 ret = fgetc(file);
54                                 if (ret == EOF)
55                                         break;
56                                 line[(len - 1)] = ret;
57                         }
58                 /* Extract information. */
59                 if (sscanf(line,
60                            "PCI_SLOT_NAME="
61                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
62                            &pci_addr->domain,
63                            &pci_addr->bus,
64                            &pci_addr->devid,
65                            &pci_addr->function) == 4) {
66                         ret = 0;
67                         break;
68                 }
69         }
70         fclose(file);
71         return 0;
72 }
73
74 static int
75 mlx5_class_check_handler(__rte_unused const char *key, const char *value,
76                          void *opaque)
77 {
78         enum mlx5_class *ret = opaque;
79
80         if (strcmp(value, "vdpa") == 0) {
81                 *ret = MLX5_CLASS_VDPA;
82         } else if (strcmp(value, "net") == 0) {
83                 *ret = MLX5_CLASS_NET;
84         } else {
85                 DRV_LOG(ERR, "Invalid mlx5 class %s. Maybe typo in device"
86                         " class argument setting?", value);
87                 *ret = MLX5_CLASS_INVALID;
88         }
89         return 0;
90 }
91
92 enum mlx5_class
93 mlx5_class_get(struct rte_devargs *devargs)
94 {
95         struct rte_kvargs *kvlist;
96         const char *key = MLX5_CLASS_ARG_NAME;
97         enum mlx5_class ret = MLX5_CLASS_NET;
98
99         if (devargs == NULL)
100                 return ret;
101         kvlist = rte_kvargs_parse(devargs->args, NULL);
102         if (kvlist == NULL)
103                 return ret;
104         if (rte_kvargs_count(kvlist, key))
105                 rte_kvargs_process(kvlist, key, mlx5_class_check_handler, &ret);
106         rte_kvargs_free(kvlist);
107         return ret;
108 }
109
110 /**
111  * Extract port name, as a number, from sysfs or netlink information.
112  *
113  * @param[in] port_name_in
114  *   String representing the port name.
115  * @param[out] port_info_out
116  *   Port information, including port name as a number and port name
117  *   type if recognized
118  *
119  * @return
120  *   port_name field set according to recognized name format.
121  */
122 void
123 mlx5_translate_port_name(const char *port_name_in,
124                          struct mlx5_switch_info *port_info_out)
125 {
126         char pf_c1, pf_c2, vf_c1, vf_c2;
127         char *end;
128         int sc_items;
129
130         /*
131          * Check for port-name as a string of the form pf0vf0
132          * (support kernel ver >= 5.0 or OFED ver >= 4.6).
133          */
134         sc_items = sscanf(port_name_in, "%c%c%d%c%c%d",
135                           &pf_c1, &pf_c2, &port_info_out->pf_num,
136                           &vf_c1, &vf_c2, &port_info_out->port_name);
137         if (sc_items == 6 &&
138             pf_c1 == 'p' && pf_c2 == 'f' &&
139             vf_c1 == 'v' && vf_c2 == 'f') {
140                 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_PFVF;
141                 return;
142         }
143         /*
144          * Check for port-name as a string of the form p0
145          * (support kernel ver >= 5.0, or OFED ver >= 4.6).
146          */
147         sc_items = sscanf(port_name_in, "%c%d",
148                           &pf_c1, &port_info_out->port_name);
149         if (sc_items == 2 && pf_c1 == 'p') {
150                 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UPLINK;
151                 return;
152         }
153         /* Check for port-name as a number (support kernel ver < 5.0 */
154         errno = 0;
155         port_info_out->port_name = strtol(port_name_in, &end, 0);
156         if (!errno &&
157             (size_t)(end - port_name_in) == strlen(port_name_in)) {
158                 port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_LEGACY;
159                 return;
160         }
161         port_info_out->name_type = MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN;
162         return;
163 }
164
165 #ifdef RTE_IBVERBS_LINK_DLOPEN
166
167 /**
168  * Suffix RTE_EAL_PMD_PATH with "-glue".
169  *
170  * This function performs a sanity check on RTE_EAL_PMD_PATH before
171  * suffixing its last component.
172  *
173  * @param buf[out]
174  *   Output buffer, should be large enough otherwise NULL is returned.
175  * @param size
176  *   Size of @p out.
177  *
178  * @return
179  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
180  */
181 static char *
182 mlx5_glue_path(char *buf, size_t size)
183 {
184         static const char *const bad[] = { "/", ".", "..", NULL };
185         const char *path = RTE_EAL_PMD_PATH;
186         size_t len = strlen(path);
187         size_t off;
188         int i;
189
190         while (len && path[len - 1] == '/')
191                 --len;
192         for (off = len; off && path[off - 1] != '/'; --off)
193                 ;
194         for (i = 0; bad[i]; ++i)
195                 if (!strncmp(path + off, bad[i], (int)(len - off)))
196                         goto error;
197         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
198         if (i == -1 || (size_t)i >= size)
199                 goto error;
200         return buf;
201 error:
202         RTE_LOG(ERR, PMD, "unable to append \"-glue\" to last component of"
203                 " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"), please"
204                 " re-configure DPDK");
205         return NULL;
206 }
207 #endif
208
209 /**
210  * Initialization routine for run-time dependency on rdma-core.
211  */
212 RTE_INIT_PRIO(mlx5_glue_init, CLASS)
213 {
214         /* Initialize common log type. */
215         mlx5_common_logtype = rte_log_register("pmd.common.mlx5");
216         if (mlx5_common_logtype >= 0)
217                 rte_log_set_level(mlx5_common_logtype, RTE_LOG_NOTICE);
218         /*
219          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
220          * huge pages. Calling ibv_fork_init() during init allows
221          * applications to use fork() safely for purposes other than
222          * using this PMD, which is not supported in forked processes.
223          */
224         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
225         /* Match the size of Rx completion entry to the size of a cacheline. */
226         if (RTE_CACHE_LINE_SIZE == 128)
227                 setenv("MLX5_CQE_SIZE", "128", 0);
228         /*
229          * MLX5_DEVICE_FATAL_CLEANUP tells ibv_destroy functions to
230          * cleanup all the Verbs resources even when the device was removed.
231          */
232         setenv("MLX5_DEVICE_FATAL_CLEANUP", "1", 1);
233         /* The glue initialization was done earlier by mlx5 common library. */
234 #ifdef RTE_IBVERBS_LINK_DLOPEN
235         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
236         void *handle = NULL;
237
238         const char *path[] = {
239                 /*
240                  * A basic security check is necessary before trusting
241                  * MLX5_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
242                  */
243                 (geteuid() == getuid() && getegid() == getgid() ?
244                  getenv("MLX5_GLUE_PATH") : NULL),
245                 /*
246                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
247                  * variant, otherwise let dlopen() look up libraries on its
248                  * own.
249                  */
250                 (*RTE_EAL_PMD_PATH ?
251                  mlx5_glue_path(glue_path, sizeof(glue_path)) : ""),
252         };
253         unsigned int i = 0;
254         void **sym;
255         const char *dlmsg;
256
257         while (!handle && i != RTE_DIM(path)) {
258                 const char *end;
259                 size_t len;
260                 int ret;
261
262                 if (!path[i]) {
263                         ++i;
264                         continue;
265                 }
266                 end = strpbrk(path[i], ":;");
267                 if (!end)
268                         end = path[i] + strlen(path[i]);
269                 len = end - path[i];
270                 ret = 0;
271                 do {
272                         char name[ret + 1];
273
274                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX5_GLUE,
275                                        (int)len, path[i],
276                                        (!len || *(end - 1) == '/') ? "" : "/");
277                         if (ret == -1)
278                                 break;
279                         if (sizeof(name) != (size_t)ret + 1)
280                                 continue;
281                         DRV_LOG(DEBUG, "Looking for rdma-core glue as "
282                                 "\"%s\"", name);
283                         handle = dlopen(name, RTLD_LAZY);
284                         break;
285                 } while (1);
286                 path[i] = end + 1;
287                 if (!*end)
288                         ++i;
289         }
290         if (!handle) {
291                 rte_errno = EINVAL;
292                 dlmsg = dlerror();
293                 if (dlmsg)
294                         DRV_LOG(WARNING, "Cannot load glue library: %s", dlmsg);
295                 goto glue_error;
296         }
297         sym = dlsym(handle, "mlx5_glue");
298         if (!sym || !*sym) {
299                 rte_errno = EINVAL;
300                 dlmsg = dlerror();
301                 if (dlmsg)
302                         DRV_LOG(ERR, "Cannot resolve glue symbol: %s", dlmsg);
303                 goto glue_error;
304         }
305         mlx5_glue = *sym;
306 #endif /* RTE_IBVERBS_LINK_DLOPEN */
307 #ifdef RTE_LIBRTE_MLX5_DEBUG
308         /* Glue structure must not contain any NULL pointers. */
309         {
310                 unsigned int i;
311
312                 for (i = 0; i != sizeof(*mlx5_glue) / sizeof(void *); ++i)
313                         MLX5_ASSERT(((const void *const *)mlx5_glue)[i]);
314         }
315 #endif
316         if (strcmp(mlx5_glue->version, MLX5_GLUE_VERSION)) {
317                 rte_errno = EINVAL;
318                 DRV_LOG(ERR, "rdma-core glue \"%s\" mismatch: \"%s\" is "
319                         "required", mlx5_glue->version, MLX5_GLUE_VERSION);
320                 goto glue_error;
321         }
322         mlx5_glue->fork_init();
323         return;
324 glue_error:
325 #ifdef RTE_IBVERBS_LINK_DLOPEN
326         if (handle)
327                 dlclose(handle);
328 #endif
329         DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing"
330                 " run-time dependency on rdma-core libraries (libibverbs,"
331                 " libmlx5)");
332         mlx5_glue = NULL;
333         return;
334 }