f7fe831d61ae77c4159b66bf72f0d2dc1a30da83
[dpdk.git] / drivers / net / mlx4 / mlx4.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright 2012 6WIND S.A.
3  * Copyright 2012 Mellanox Technologies, Ltd
4  */
5
6 /**
7  * @file
8  * mlx4 driver initialization.
9  */
10
11 #include <errno.h>
12 #include <inttypes.h>
13 #include <stddef.h>
14 #include <stdint.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18 #include <sys/mman.h>
19 #include <unistd.h>
20 #ifdef RTE_IBVERBS_LINK_DLOPEN
21 #include <dlfcn.h>
22 #endif
23
24 /* Verbs headers do not support -pedantic. */
25 #ifdef PEDANTIC
26 #pragma GCC diagnostic ignored "-Wpedantic"
27 #endif
28 #include <infiniband/verbs.h>
29 #ifdef PEDANTIC
30 #pragma GCC diagnostic error "-Wpedantic"
31 #endif
32
33 #include <rte_common.h>
34 #include <rte_dev.h>
35 #include <rte_errno.h>
36 #include <ethdev_driver.h>
37 #include <ethdev_pci.h>
38 #include <rte_ether.h>
39 #include <rte_flow.h>
40 #include <rte_interrupts.h>
41 #include <rte_kvargs.h>
42 #include <rte_malloc.h>
43 #include <rte_mbuf.h>
44
45 #include "mlx4.h"
46 #include "mlx4_glue.h"
47 #include "mlx4_flow.h"
48 #include "mlx4_mr.h"
49 #include "mlx4_rxtx.h"
50 #include "mlx4_utils.h"
51
52 #ifdef MLX4_GLUE
53 const struct mlx4_glue *mlx4_glue;
54 #endif
55
56 static const char *MZ_MLX4_PMD_SHARED_DATA = "mlx4_pmd_shared_data";
57
58 /* Shared memory between primary and secondary processes. */
59 struct mlx4_shared_data *mlx4_shared_data;
60
61 /* Spinlock for mlx4_shared_data allocation. */
62 static rte_spinlock_t mlx4_shared_data_lock = RTE_SPINLOCK_INITIALIZER;
63
64 /* Process local data for secondary processes. */
65 static struct mlx4_local_data mlx4_local_data;
66
67 /** Configuration structure for device arguments. */
68 struct mlx4_conf {
69         struct {
70                 uint32_t present; /**< Bit-field for existing ports. */
71                 uint32_t enabled; /**< Bit-field for user-enabled ports. */
72         } ports;
73         int mr_ext_memseg_en;
74         /** Whether memseg should be extended for MR creation. */
75 };
76
77 /* Available parameters list. */
78 const char *pmd_mlx4_init_params[] = {
79         MLX4_PMD_PORT_KVARG,
80         MLX4_MR_EXT_MEMSEG_EN_KVARG,
81         NULL,
82 };
83
84 static int mlx4_dev_stop(struct rte_eth_dev *dev);
85
86 /**
87  * Initialize shared data between primary and secondary process.
88  *
89  * A memzone is reserved by primary process and secondary processes attach to
90  * the memzone.
91  *
92  * @return
93  *   0 on success, a negative errno value otherwise and rte_errno is set.
94  */
95 static int
96 mlx4_init_shared_data(void)
97 {
98         const struct rte_memzone *mz;
99         int ret = 0;
100
101         rte_spinlock_lock(&mlx4_shared_data_lock);
102         if (mlx4_shared_data == NULL) {
103                 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
104                         /* Allocate shared memory. */
105                         mz = rte_memzone_reserve(MZ_MLX4_PMD_SHARED_DATA,
106                                                  sizeof(*mlx4_shared_data),
107                                                  SOCKET_ID_ANY, 0);
108                         if (mz == NULL) {
109                                 ERROR("Cannot allocate mlx4 shared data\n");
110                                 ret = -rte_errno;
111                                 goto error;
112                         }
113                         mlx4_shared_data = mz->addr;
114                         memset(mlx4_shared_data, 0, sizeof(*mlx4_shared_data));
115                         rte_spinlock_init(&mlx4_shared_data->lock);
116                 } else {
117                         /* Lookup allocated shared memory. */
118                         mz = rte_memzone_lookup(MZ_MLX4_PMD_SHARED_DATA);
119                         if (mz == NULL) {
120                                 ERROR("Cannot attach mlx4 shared data\n");
121                                 ret = -rte_errno;
122                                 goto error;
123                         }
124                         mlx4_shared_data = mz->addr;
125                         memset(&mlx4_local_data, 0, sizeof(mlx4_local_data));
126                 }
127         }
128 error:
129         rte_spinlock_unlock(&mlx4_shared_data_lock);
130         return ret;
131 }
132
133 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
134 /**
135  * Verbs callback to allocate a memory. This function should allocate the space
136  * according to the size provided residing inside a huge page.
137  * Please note that all allocation must respect the alignment from libmlx4
138  * (i.e. currently sysconf(_SC_PAGESIZE)).
139  *
140  * @param[in] size
141  *   The size in bytes of the memory to allocate.
142  * @param[in] data
143  *   A pointer to the callback data.
144  *
145  * @return
146  *   Allocated buffer, NULL otherwise and rte_errno is set.
147  */
148 static void *
149 mlx4_alloc_verbs_buf(size_t size, void *data)
150 {
151         struct mlx4_priv *priv = data;
152         void *ret;
153         size_t alignment = sysconf(_SC_PAGESIZE);
154         unsigned int socket = SOCKET_ID_ANY;
155
156         if (priv->verbs_alloc_ctx.type == MLX4_VERBS_ALLOC_TYPE_TX_QUEUE) {
157                 const struct txq *txq = priv->verbs_alloc_ctx.obj;
158
159                 socket = txq->socket;
160         } else if (priv->verbs_alloc_ctx.type ==
161                    MLX4_VERBS_ALLOC_TYPE_RX_QUEUE) {
162                 const struct rxq *rxq = priv->verbs_alloc_ctx.obj;
163
164                 socket = rxq->socket;
165         }
166         MLX4_ASSERT(data != NULL);
167         ret = rte_malloc_socket(__func__, size, alignment, socket);
168         if (!ret && size)
169                 rte_errno = ENOMEM;
170         return ret;
171 }
172
173 /**
174  * Verbs callback to free a memory.
175  *
176  * @param[in] ptr
177  *   A pointer to the memory to free.
178  * @param[in] data
179  *   A pointer to the callback data.
180  */
181 static void
182 mlx4_free_verbs_buf(void *ptr, void *data __rte_unused)
183 {
184         MLX4_ASSERT(data != NULL);
185         rte_free(ptr);
186 }
187 #endif
188
189 /**
190  * Initialize process private data structure.
191  *
192  * @param dev
193  *   Pointer to Ethernet device structure.
194  *
195  * @return
196  *   0 on success, a negative errno value otherwise and rte_errno is set.
197  */
198 int
199 mlx4_proc_priv_init(struct rte_eth_dev *dev)
200 {
201         struct mlx4_proc_priv *ppriv;
202         size_t ppriv_size;
203
204         mlx4_proc_priv_uninit(dev);
205         /*
206          * UAR register table follows the process private structure. BlueFlame
207          * registers for Tx queues are stored in the table.
208          */
209         ppriv_size = sizeof(struct mlx4_proc_priv) +
210                      dev->data->nb_tx_queues * sizeof(void *);
211         ppriv = rte_zmalloc_socket("mlx4_proc_priv", ppriv_size,
212                                    RTE_CACHE_LINE_SIZE, dev->device->numa_node);
213         if (!ppriv) {
214                 rte_errno = ENOMEM;
215                 return -rte_errno;
216         }
217         ppriv->uar_table_sz = dev->data->nb_tx_queues;
218         dev->process_private = ppriv;
219         return 0;
220 }
221
222 /**
223  * Un-initialize process private data structure.
224  *
225  * @param dev
226  *   Pointer to Ethernet device structure.
227  */
228 void
229 mlx4_proc_priv_uninit(struct rte_eth_dev *dev)
230 {
231         if (!dev->process_private)
232                 return;
233         rte_free(dev->process_private);
234         dev->process_private = NULL;
235 }
236
237 /**
238  * DPDK callback for Ethernet device configuration.
239  *
240  * @param dev
241  *   Pointer to Ethernet device structure.
242  *
243  * @return
244  *   0 on success, negative errno value otherwise and rte_errno is set.
245  */
246 static int
247 mlx4_dev_configure(struct rte_eth_dev *dev)
248 {
249         struct mlx4_priv *priv = dev->data->dev_private;
250         struct rte_flow_error error;
251         int ret;
252
253         /* Prepare internal flow rules. */
254         ret = mlx4_flow_sync(priv, &error);
255         if (ret) {
256                 ERROR("cannot set up internal flow rules (code %d, \"%s\"),"
257                       " flow error type %d, cause %p, message: %s",
258                       -ret, strerror(-ret), error.type, error.cause,
259                       error.message ? error.message : "(unspecified)");
260                 goto exit;
261         }
262         ret = mlx4_intr_install(priv);
263         if (ret) {
264                 ERROR("%p: interrupt handler installation failed",
265                       (void *)dev);
266                 goto exit;
267         }
268         ret = mlx4_proc_priv_init(dev);
269         if (ret) {
270                 ERROR("%p: process private data allocation failed",
271                       (void *)dev);
272                 goto exit;
273         }
274 exit:
275         return ret;
276 }
277
278 /**
279  * DPDK callback to start the device.
280  *
281  * Simulate device start by initializing common RSS resources and attaching
282  * all configured flows.
283  *
284  * @param dev
285  *   Pointer to Ethernet device structure.
286  *
287  * @return
288  *   0 on success, negative errno value otherwise and rte_errno is set.
289  */
290 static int
291 mlx4_dev_start(struct rte_eth_dev *dev)
292 {
293         struct mlx4_priv *priv = dev->data->dev_private;
294         struct rte_flow_error error;
295         int ret;
296
297         if (priv->started)
298                 return 0;
299         DEBUG("%p: attaching configured flows to all RX queues", (void *)dev);
300         priv->started = 1;
301         ret = mlx4_rss_init(priv);
302         if (ret) {
303                 ERROR("%p: cannot initialize RSS resources: %s",
304                       (void *)dev, strerror(-ret));
305                 goto err;
306         }
307 #ifdef RTE_LIBRTE_MLX4_DEBUG
308         mlx4_mr_dump_dev(dev);
309 #endif
310         ret = mlx4_rxq_intr_enable(priv);
311         if (ret) {
312                 ERROR("%p: interrupt handler installation failed",
313                      (void *)dev);
314                 goto err;
315         }
316         ret = mlx4_flow_sync(priv, &error);
317         if (ret) {
318                 ERROR("%p: cannot attach flow rules (code %d, \"%s\"),"
319                       " flow error type %d, cause %p, message: %s",
320                       (void *)dev,
321                       -ret, strerror(-ret), error.type, error.cause,
322                       error.message ? error.message : "(unspecified)");
323                 goto err;
324         }
325         rte_wmb();
326         dev->tx_pkt_burst = mlx4_tx_burst;
327         dev->rx_pkt_burst = mlx4_rx_burst;
328         /* Enable datapath on secondary process. */
329         mlx4_mp_req_start_rxtx(dev);
330         return 0;
331 err:
332         mlx4_dev_stop(dev);
333         return ret;
334 }
335
336 /**
337  * DPDK callback to stop the device.
338  *
339  * Simulate device stop by detaching all configured flows.
340  *
341  * @param dev
342  *   Pointer to Ethernet device structure.
343  */
344 static int
345 mlx4_dev_stop(struct rte_eth_dev *dev)
346 {
347         struct mlx4_priv *priv = dev->data->dev_private;
348
349         if (!priv->started)
350                 return 0;
351         DEBUG("%p: detaching flows from all RX queues", (void *)dev);
352         priv->started = 0;
353         dev->tx_pkt_burst = mlx4_tx_burst_removed;
354         dev->rx_pkt_burst = mlx4_rx_burst_removed;
355         rte_wmb();
356         /* Disable datapath on secondary process. */
357         mlx4_mp_req_stop_rxtx(dev);
358         mlx4_flow_sync(priv, NULL);
359         mlx4_rxq_intr_disable(priv);
360         mlx4_rss_deinit(priv);
361
362         return 0;
363 }
364
365 /**
366  * DPDK callback to close the device.
367  *
368  * Destroy all queues and objects, free memory.
369  *
370  * @param dev
371  *   Pointer to Ethernet device structure.
372  */
373 static int
374 mlx4_dev_close(struct rte_eth_dev *dev)
375 {
376         struct mlx4_priv *priv = dev->data->dev_private;
377         unsigned int i;
378
379         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
380                 rte_eth_dev_release_port(dev);
381                 return 0;
382         }
383         DEBUG("%p: closing device \"%s\"",
384               (void *)dev,
385               ((priv->ctx != NULL) ? priv->ctx->device->name : ""));
386         dev->rx_pkt_burst = mlx4_rx_burst_removed;
387         dev->tx_pkt_burst = mlx4_tx_burst_removed;
388         rte_wmb();
389         /* Disable datapath on secondary process. */
390         mlx4_mp_req_stop_rxtx(dev);
391         mlx4_flow_clean(priv);
392         mlx4_rss_deinit(priv);
393         for (i = 0; i != dev->data->nb_rx_queues; ++i)
394                 mlx4_rx_queue_release(dev, i);
395         for (i = 0; i != dev->data->nb_tx_queues; ++i)
396                 mlx4_tx_queue_release(dev, i);
397         mlx4_proc_priv_uninit(dev);
398         mlx4_mr_release(dev);
399         if (priv->pd != NULL) {
400                 MLX4_ASSERT(priv->ctx != NULL);
401                 claim_zero(mlx4_glue->dealloc_pd(priv->pd));
402                 claim_zero(mlx4_glue->close_device(priv->ctx));
403         } else
404                 MLX4_ASSERT(priv->ctx == NULL);
405         mlx4_intr_uninstall(priv);
406         memset(priv, 0, sizeof(*priv));
407         /* mac_addrs must not be freed because part of dev_private */
408         dev->data->mac_addrs = NULL;
409         return 0;
410 }
411
412 static const struct eth_dev_ops mlx4_dev_ops = {
413         .dev_configure = mlx4_dev_configure,
414         .dev_start = mlx4_dev_start,
415         .dev_stop = mlx4_dev_stop,
416         .dev_set_link_down = mlx4_dev_set_link_down,
417         .dev_set_link_up = mlx4_dev_set_link_up,
418         .dev_close = mlx4_dev_close,
419         .link_update = mlx4_link_update,
420         .promiscuous_enable = mlx4_promiscuous_enable,
421         .promiscuous_disable = mlx4_promiscuous_disable,
422         .allmulticast_enable = mlx4_allmulticast_enable,
423         .allmulticast_disable = mlx4_allmulticast_disable,
424         .mac_addr_remove = mlx4_mac_addr_remove,
425         .mac_addr_add = mlx4_mac_addr_add,
426         .mac_addr_set = mlx4_mac_addr_set,
427         .set_mc_addr_list = mlx4_set_mc_addr_list,
428         .stats_get = mlx4_stats_get,
429         .stats_reset = mlx4_stats_reset,
430         .fw_version_get = mlx4_fw_version_get,
431         .dev_infos_get = mlx4_dev_infos_get,
432         .dev_supported_ptypes_get = mlx4_dev_supported_ptypes_get,
433         .vlan_filter_set = mlx4_vlan_filter_set,
434         .rx_queue_setup = mlx4_rx_queue_setup,
435         .tx_queue_setup = mlx4_tx_queue_setup,
436         .rx_queue_release = mlx4_rx_queue_release,
437         .tx_queue_release = mlx4_tx_queue_release,
438         .flow_ctrl_get = mlx4_flow_ctrl_get,
439         .flow_ctrl_set = mlx4_flow_ctrl_set,
440         .mtu_set = mlx4_mtu_set,
441         .flow_ops_get = mlx4_flow_ops_get,
442         .rx_queue_intr_enable = mlx4_rx_intr_enable,
443         .rx_queue_intr_disable = mlx4_rx_intr_disable,
444         .is_removed = mlx4_is_removed,
445 };
446
447 /* Available operations from secondary process. */
448 static const struct eth_dev_ops mlx4_dev_sec_ops = {
449         .stats_get = mlx4_stats_get,
450         .stats_reset = mlx4_stats_reset,
451         .fw_version_get = mlx4_fw_version_get,
452         .dev_infos_get = mlx4_dev_infos_get,
453 };
454
455 /**
456  * Get PCI information from struct ibv_device.
457  *
458  * @param device
459  *   Pointer to Ethernet device structure.
460  * @param[out] pci_addr
461  *   PCI bus address output buffer.
462  *
463  * @return
464  *   0 on success, negative errno value otherwise and rte_errno is set.
465  */
466 static int
467 mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
468                             struct rte_pci_addr *pci_addr)
469 {
470         FILE *file;
471         char line[32];
472         MKSTR(path, "%s/device/uevent", device->ibdev_path);
473
474         file = fopen(path, "rb");
475         if (file == NULL) {
476                 rte_errno = errno;
477                 return -rte_errno;
478         }
479         while (fgets(line, sizeof(line), file) == line) {
480                 size_t len = strlen(line);
481                 int ret;
482
483                 /* Truncate long lines. */
484                 if (len == (sizeof(line) - 1))
485                         while (line[(len - 1)] != '\n') {
486                                 ret = fgetc(file);
487                                 if (ret == EOF)
488                                         break;
489                                 line[(len - 1)] = ret;
490                         }
491                 /* Extract information. */
492                 if (sscanf(line,
493                            "PCI_SLOT_NAME="
494                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
495                            &pci_addr->domain,
496                            &pci_addr->bus,
497                            &pci_addr->devid,
498                            &pci_addr->function) == 4) {
499                         break;
500                 }
501         }
502         fclose(file);
503         return 0;
504 }
505
506 /**
507  * Verify and store value for device argument.
508  *
509  * @param[in] key
510  *   Key argument to verify.
511  * @param[in] val
512  *   Value associated with key.
513  * @param[in, out] conf
514  *   Shared configuration data.
515  *
516  * @return
517  *   0 on success, negative errno value otherwise and rte_errno is set.
518  */
519 static int
520 mlx4_arg_parse(const char *key, const char *val, struct mlx4_conf *conf)
521 {
522         unsigned long tmp;
523
524         errno = 0;
525         tmp = strtoul(val, NULL, 0);
526         if (errno) {
527                 rte_errno = errno;
528                 WARN("%s: \"%s\" is not a valid integer", key, val);
529                 return -rte_errno;
530         }
531         if (strcmp(MLX4_PMD_PORT_KVARG, key) == 0) {
532                 uint32_t ports = rte_log2_u32(conf->ports.present + 1);
533
534                 if (tmp >= ports) {
535                         ERROR("port index %lu outside range [0,%" PRIu32 ")",
536                               tmp, ports);
537                         return -EINVAL;
538                 }
539                 if (!(conf->ports.present & (1 << tmp))) {
540                         rte_errno = EINVAL;
541                         ERROR("invalid port index %lu", tmp);
542                         return -rte_errno;
543                 }
544                 conf->ports.enabled |= 1 << tmp;
545         } else if (strcmp(MLX4_MR_EXT_MEMSEG_EN_KVARG, key) == 0) {
546                 conf->mr_ext_memseg_en = !!tmp;
547         } else {
548                 rte_errno = EINVAL;
549                 WARN("%s: unknown parameter", key);
550                 return -rte_errno;
551         }
552         return 0;
553 }
554
555 /**
556  * Parse device parameters.
557  *
558  * @param devargs
559  *   Device arguments structure.
560  *
561  * @return
562  *   0 on success, negative errno value otherwise and rte_errno is set.
563  */
564 static int
565 mlx4_args(struct rte_devargs *devargs, struct mlx4_conf *conf)
566 {
567         struct rte_kvargs *kvlist;
568         unsigned int arg_count;
569         int ret = 0;
570         int i;
571
572         if (devargs == NULL)
573                 return 0;
574         kvlist = rte_kvargs_parse(devargs->args, pmd_mlx4_init_params);
575         if (kvlist == NULL) {
576                 rte_errno = EINVAL;
577                 ERROR("failed to parse kvargs");
578                 return -rte_errno;
579         }
580         /* Process parameters. */
581         for (i = 0; pmd_mlx4_init_params[i]; ++i) {
582                 arg_count = rte_kvargs_count(kvlist, pmd_mlx4_init_params[i]);
583                 while (arg_count-- > 0) {
584                         ret = rte_kvargs_process(kvlist,
585                                                  pmd_mlx4_init_params[i],
586                                                  (int (*)(const char *,
587                                                           const char *,
588                                                           void *))
589                                                  mlx4_arg_parse,
590                                                  conf);
591                         if (ret != 0)
592                                 goto free_kvlist;
593                 }
594         }
595 free_kvlist:
596         rte_kvargs_free(kvlist);
597         return ret;
598 }
599
600 /**
601  * Interpret RSS capabilities reported by device.
602  *
603  * This function returns the set of usable Verbs RSS hash fields, kernel
604  * quirks taken into account.
605  *
606  * @param ctx
607  *   Verbs context.
608  * @param pd
609  *   Verbs protection domain.
610  * @param device_attr_ex
611  *   Extended device attributes to interpret.
612  *
613  * @return
614  *   Usable RSS hash fields mask in Verbs format.
615  */
616 static uint64_t
617 mlx4_hw_rss_sup(struct ibv_context *ctx, struct ibv_pd *pd,
618                 struct ibv_device_attr_ex *device_attr_ex)
619 {
620         uint64_t hw_rss_sup = device_attr_ex->rss_caps.rx_hash_fields_mask;
621         struct ibv_cq *cq = NULL;
622         struct ibv_wq *wq = NULL;
623         struct ibv_rwq_ind_table *ind = NULL;
624         struct ibv_qp *qp = NULL;
625
626         if (!hw_rss_sup) {
627                 WARN("no RSS capabilities reported; disabling support for UDP"
628                      " RSS and inner VXLAN RSS");
629                 return IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4 |
630                         IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6 |
631                         IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP;
632         }
633         if (!(hw_rss_sup & IBV_RX_HASH_INNER))
634                 return hw_rss_sup;
635         /*
636          * Although reported as supported, missing code in some Linux
637          * versions (v4.15, v4.16) prevents the creation of hash QPs with
638          * inner capability.
639          *
640          * There is no choice but to attempt to instantiate a temporary RSS
641          * context in order to confirm its support.
642          */
643         cq = mlx4_glue->create_cq(ctx, 1, NULL, NULL, 0);
644         wq = cq ? mlx4_glue->create_wq
645                 (ctx,
646                  &(struct ibv_wq_init_attr){
647                         .wq_type = IBV_WQT_RQ,
648                         .max_wr = 1,
649                         .max_sge = 1,
650                         .pd = pd,
651                         .cq = cq,
652                  }) : NULL;
653         ind = wq ? mlx4_glue->create_rwq_ind_table
654                 (ctx,
655                  &(struct ibv_rwq_ind_table_init_attr){
656                         .log_ind_tbl_size = 0,
657                         .ind_tbl = &wq,
658                         .comp_mask = 0,
659                  }) : NULL;
660         qp = ind ? mlx4_glue->create_qp_ex
661                 (ctx,
662                  &(struct ibv_qp_init_attr_ex){
663                         .comp_mask =
664                                 (IBV_QP_INIT_ATTR_PD |
665                                  IBV_QP_INIT_ATTR_RX_HASH |
666                                  IBV_QP_INIT_ATTR_IND_TABLE),
667                         .qp_type = IBV_QPT_RAW_PACKET,
668                         .pd = pd,
669                         .rwq_ind_tbl = ind,
670                         .rx_hash_conf = {
671                                 .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
672                                 .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
673                                 .rx_hash_key = mlx4_rss_hash_key_default,
674                                 .rx_hash_fields_mask = hw_rss_sup,
675                         },
676                  }) : NULL;
677         if (!qp) {
678                 WARN("disabling unusable inner RSS capability due to kernel"
679                      " quirk");
680                 hw_rss_sup &= ~IBV_RX_HASH_INNER;
681         } else {
682                 claim_zero(mlx4_glue->destroy_qp(qp));
683         }
684         if (ind)
685                 claim_zero(mlx4_glue->destroy_rwq_ind_table(ind));
686         if (wq)
687                 claim_zero(mlx4_glue->destroy_wq(wq));
688         if (cq)
689                 claim_zero(mlx4_glue->destroy_cq(cq));
690         return hw_rss_sup;
691 }
692
693 static struct rte_pci_driver mlx4_driver;
694
695 /**
696  * PMD global initialization.
697  *
698  * Independent from individual device, this function initializes global
699  * per-PMD data structures distinguishing primary and secondary processes.
700  * Hence, each initialization is called once per a process.
701  *
702  * @return
703  *   0 on success, a negative errno value otherwise and rte_errno is set.
704  */
705 static int
706 mlx4_init_once(void)
707 {
708         struct mlx4_shared_data *sd;
709         struct mlx4_local_data *ld = &mlx4_local_data;
710         int ret = 0;
711
712         if (mlx4_init_shared_data())
713                 return -rte_errno;
714         sd = mlx4_shared_data;
715         MLX4_ASSERT(sd);
716         rte_spinlock_lock(&sd->lock);
717         switch (rte_eal_process_type()) {
718         case RTE_PROC_PRIMARY:
719                 if (sd->init_done)
720                         break;
721                 LIST_INIT(&sd->mem_event_cb_list);
722                 rte_rwlock_init(&sd->mem_event_rwlock);
723                 rte_mem_event_callback_register("MLX4_MEM_EVENT_CB",
724                                                 mlx4_mr_mem_event_cb, NULL);
725                 ret = mlx4_mp_init_primary();
726                 if (ret)
727                         goto out;
728                 sd->init_done = 1;
729                 break;
730         case RTE_PROC_SECONDARY:
731                 if (ld->init_done)
732                         break;
733                 ret = mlx4_mp_init_secondary();
734                 if (ret)
735                         goto out;
736                 ++sd->secondary_cnt;
737                 ld->init_done = 1;
738                 break;
739         default:
740                 break;
741         }
742 out:
743         rte_spinlock_unlock(&sd->lock);
744         return ret;
745 }
746
747 /**
748  * DPDK callback to register a PCI device.
749  *
750  * This function creates an Ethernet device for each port of a given
751  * PCI device.
752  *
753  * @param[in] pci_drv
754  *   PCI driver structure (mlx4_driver).
755  * @param[in] pci_dev
756  *   PCI device information.
757  *
758  * @return
759  *   0 on success, negative errno value otherwise and rte_errno is set.
760  */
761 static int
762 mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
763 {
764         struct ibv_device **list;
765         struct ibv_device *ibv_dev;
766         int err = 0;
767         struct ibv_context *attr_ctx = NULL;
768         struct ibv_device_attr device_attr;
769         struct ibv_device_attr_ex device_attr_ex;
770         struct rte_eth_dev *prev_dev = NULL;
771         struct mlx4_conf conf = {
772                 .ports.present = 0,
773                 .mr_ext_memseg_en = 1,
774         };
775         unsigned int vf;
776         int i;
777         char ifname[IF_NAMESIZE];
778
779         (void)pci_drv;
780         err = mlx4_init_once();
781         if (err) {
782                 ERROR("unable to init PMD global data: %s",
783                       strerror(rte_errno));
784                 return -rte_errno;
785         }
786         MLX4_ASSERT(pci_drv == &mlx4_driver);
787         list = mlx4_glue->get_device_list(&i);
788         if (list == NULL) {
789                 rte_errno = errno;
790                 MLX4_ASSERT(rte_errno);
791                 if (rte_errno == ENOSYS)
792                         ERROR("cannot list devices, is ib_uverbs loaded?");
793                 return -rte_errno;
794         }
795         MLX4_ASSERT(i >= 0);
796         /*
797          * For each listed device, check related sysfs entry against
798          * the provided PCI ID.
799          */
800         while (i != 0) {
801                 struct rte_pci_addr pci_addr;
802
803                 --i;
804                 DEBUG("checking device \"%s\"", list[i]->name);
805                 if (mlx4_ibv_device_to_pci_addr(list[i], &pci_addr))
806                         continue;
807                 if ((pci_dev->addr.domain != pci_addr.domain) ||
808                     (pci_dev->addr.bus != pci_addr.bus) ||
809                     (pci_dev->addr.devid != pci_addr.devid) ||
810                     (pci_dev->addr.function != pci_addr.function))
811                         continue;
812                 vf = (pci_dev->id.device_id ==
813                       PCI_DEVICE_ID_MELLANOX_CONNECTX3VF);
814                 INFO("PCI information matches, using device \"%s\" (VF: %s)",
815                      list[i]->name, (vf ? "true" : "false"));
816                 attr_ctx = mlx4_glue->open_device(list[i]);
817                 err = errno;
818                 break;
819         }
820         if (attr_ctx == NULL) {
821                 mlx4_glue->free_device_list(list);
822                 switch (err) {
823                 case 0:
824                         rte_errno = ENODEV;
825                         ERROR("cannot access device, is mlx4_ib loaded?");
826                         return -rte_errno;
827                 case EINVAL:
828                         rte_errno = EINVAL;
829                         ERROR("cannot use device, are drivers up to date?");
830                         return -rte_errno;
831                 }
832                 MLX4_ASSERT(err > 0);
833                 rte_errno = err;
834                 return -rte_errno;
835         }
836         ibv_dev = list[i];
837         DEBUG("device opened");
838         if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
839                 err = ENODEV;
840                 goto error;
841         }
842         INFO("%u port(s) detected", device_attr.phys_port_cnt);
843         conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
844         if (mlx4_args(pci_dev->device.devargs, &conf)) {
845                 ERROR("failed to process device arguments");
846                 err = EINVAL;
847                 goto error;
848         }
849         /* Use all ports when none are defined */
850         if (!conf.ports.enabled)
851                 conf.ports.enabled = conf.ports.present;
852         /* Retrieve extended device attributes. */
853         if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
854                 err = ENODEV;
855                 goto error;
856         }
857         MLX4_ASSERT(device_attr.max_sge >= MLX4_MAX_SGE);
858         for (i = 0; i < device_attr.phys_port_cnt; i++) {
859                 uint32_t port = i + 1; /* ports are indexed from one */
860                 struct ibv_context *ctx = NULL;
861                 struct ibv_port_attr port_attr;
862                 struct ibv_pd *pd = NULL;
863                 struct mlx4_priv *priv = NULL;
864                 struct rte_eth_dev *eth_dev = NULL;
865                 struct rte_ether_addr mac;
866                 char name[RTE_ETH_NAME_MAX_LEN];
867
868                 /* If port is not enabled, skip. */
869                 if (!(conf.ports.enabled & (1 << i)))
870                         continue;
871                 DEBUG("using port %u", port);
872                 ctx = mlx4_glue->open_device(ibv_dev);
873                 if (ctx == NULL) {
874                         err = ENODEV;
875                         goto port_error;
876                 }
877                 snprintf(name, sizeof(name), "%s port %u",
878                          mlx4_glue->get_device_name(ibv_dev), port);
879                 if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
880                         eth_dev = rte_eth_dev_attach_secondary(name);
881                         if (eth_dev == NULL) {
882                                 ERROR("can not attach rte ethdev");
883                                 rte_errno = ENOMEM;
884                                 err = rte_errno;
885                                 goto err_secondary;
886                         }
887                         priv = eth_dev->data->dev_private;
888                         if (!priv->verbs_alloc_ctx.enabled) {
889                                 ERROR("secondary process is not supported"
890                                       " due to lack of external allocator"
891                                       " from Verbs");
892                                 rte_errno = ENOTSUP;
893                                 err = rte_errno;
894                                 goto err_secondary;
895                         }
896                         eth_dev->device = &pci_dev->device;
897                         eth_dev->dev_ops = &mlx4_dev_sec_ops;
898                         err = mlx4_proc_priv_init(eth_dev);
899                         if (err)
900                                 goto err_secondary;
901                         /* Receive command fd from primary process. */
902                         err = mlx4_mp_req_verbs_cmd_fd(eth_dev);
903                         if (err < 0) {
904                                 err = rte_errno;
905                                 goto err_secondary;
906                         }
907                         /* Remap UAR for Tx queues. */
908                         err = mlx4_tx_uar_init_secondary(eth_dev, err);
909                         if (err) {
910                                 err = rte_errno;
911                                 goto err_secondary;
912                         }
913                         /*
914                          * Ethdev pointer is still required as input since
915                          * the primary device is not accessible from the
916                          * secondary process.
917                          */
918                         eth_dev->tx_pkt_burst = mlx4_tx_burst;
919                         eth_dev->rx_pkt_burst = mlx4_rx_burst;
920                         claim_zero(mlx4_glue->close_device(ctx));
921                         rte_eth_copy_pci_info(eth_dev, pci_dev);
922                         rte_eth_dev_probing_finish(eth_dev);
923                         prev_dev = eth_dev;
924                         continue;
925 err_secondary:
926                         claim_zero(mlx4_glue->close_device(ctx));
927                         rte_eth_dev_release_port(eth_dev);
928                         if (prev_dev)
929                                 rte_eth_dev_release_port(prev_dev);
930                         break;
931                 }
932                 /* Check port status. */
933                 err = mlx4_glue->query_port(ctx, port, &port_attr);
934                 if (err) {
935                         err = ENODEV;
936                         ERROR("port query failed: %s", strerror(err));
937                         goto port_error;
938                 }
939                 if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
940                         err = ENOTSUP;
941                         ERROR("port %d is not configured in Ethernet mode",
942                               port);
943                         goto port_error;
944                 }
945                 if (port_attr.state != IBV_PORT_ACTIVE)
946                         DEBUG("port %d is not active: \"%s\" (%d)",
947                               port, mlx4_glue->port_state_str(port_attr.state),
948                               port_attr.state);
949                 /* Make asynchronous FD non-blocking to handle interrupts. */
950                 err = mlx4_fd_set_non_blocking(ctx->async_fd);
951                 if (err) {
952                         ERROR("cannot make asynchronous FD non-blocking: %s",
953                               strerror(err));
954                         goto port_error;
955                 }
956                 /* Allocate protection domain. */
957                 pd = mlx4_glue->alloc_pd(ctx);
958                 if (pd == NULL) {
959                         err = ENOMEM;
960                         ERROR("PD allocation failure");
961                         goto port_error;
962                 }
963                 /* from rte_ethdev.c */
964                 priv = rte_zmalloc("ethdev private structure",
965                                    sizeof(*priv),
966                                    RTE_CACHE_LINE_SIZE);
967                 if (priv == NULL) {
968                         err = ENOMEM;
969                         ERROR("priv allocation failure");
970                         goto port_error;
971                 }
972                 priv->ctx = ctx;
973                 priv->device_attr = device_attr;
974                 priv->port = port;
975                 priv->pd = pd;
976                 priv->mtu = RTE_ETHER_MTU;
977                 priv->vf = vf;
978                 priv->hw_csum = !!(device_attr.device_cap_flags &
979                                    IBV_DEVICE_RAW_IP_CSUM);
980                 DEBUG("checksum offloading is %ssupported",
981                       (priv->hw_csum ? "" : "not "));
982                 /* Only ConnectX-3 Pro supports tunneling. */
983                 priv->hw_csum_l2tun =
984                         priv->hw_csum &&
985                         (device_attr.vendor_part_id ==
986                          PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO);
987                 DEBUG("L2 tunnel checksum offloads are %ssupported",
988                       priv->hw_csum_l2tun ? "" : "not ");
989                 priv->hw_rss_sup = mlx4_hw_rss_sup(priv->ctx, priv->pd,
990                                                    &device_attr_ex);
991                 DEBUG("supported RSS hash fields mask: %016" PRIx64,
992                       priv->hw_rss_sup);
993                 priv->hw_rss_max_qps =
994                         device_attr_ex.rss_caps.max_rwq_indirection_table_size;
995                 DEBUG("MAX RSS queues %d", priv->hw_rss_max_qps);
996                 priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
997                                         IBV_RAW_PACKET_CAP_SCATTER_FCS);
998                 DEBUG("FCS stripping toggling is %ssupported",
999                       priv->hw_fcs_strip ? "" : "not ");
1000                 priv->tso =
1001                         ((device_attr_ex.tso_caps.max_tso > 0) &&
1002                          (device_attr_ex.tso_caps.supported_qpts &
1003                           (1 << IBV_QPT_RAW_PACKET)));
1004                 if (priv->tso)
1005                         priv->tso_max_payload_sz =
1006                                         device_attr_ex.tso_caps.max_tso;
1007                 DEBUG("TSO is %ssupported",
1008                       priv->tso ? "" : "not ");
1009                 priv->mr_ext_memseg_en = conf.mr_ext_memseg_en;
1010                 /* Configure the first MAC address by default. */
1011                 err = mlx4_get_mac(priv, &mac.addr_bytes);
1012                 if (err) {
1013                         ERROR("cannot get MAC address, is mlx4_en loaded?"
1014                               " (error: %s)", strerror(err));
1015                         goto port_error;
1016                 }
1017                 INFO("port %u MAC address is " RTE_ETHER_ADDR_PRT_FMT,
1018                      priv->port, RTE_ETHER_ADDR_BYTES(&mac));
1019                 /* Register MAC address. */
1020                 priv->mac[0] = mac;
1021
1022                 if (mlx4_get_ifname(priv, &ifname) == 0) {
1023                         DEBUG("port %u ifname is \"%s\"",
1024                               priv->port, ifname);
1025                         priv->if_index = if_nametoindex(ifname);
1026                 } else {
1027                         DEBUG("port %u ifname is unknown", priv->port);
1028                 }
1029
1030                 /* Get actual MTU if possible. */
1031                 mlx4_mtu_get(priv, &priv->mtu);
1032                 DEBUG("port %u MTU is %u", priv->port, priv->mtu);
1033                 eth_dev = rte_eth_dev_allocate(name);
1034                 if (eth_dev == NULL) {
1035                         err = ENOMEM;
1036                         ERROR("can not allocate rte ethdev");
1037                         goto port_error;
1038                 }
1039                 eth_dev->data->dev_private = priv;
1040                 eth_dev->data->mac_addrs = priv->mac;
1041                 eth_dev->device = &pci_dev->device;
1042                 rte_eth_copy_pci_info(eth_dev, pci_dev);
1043                 eth_dev->data->dev_flags |= RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
1044                 /* Initialize local interrupt handle for current port. */
1045                 memset(&priv->intr_handle, 0, sizeof(struct rte_intr_handle));
1046                 priv->intr_handle.fd = -1;
1047                 priv->intr_handle.type = RTE_INTR_HANDLE_EXT;
1048                 /*
1049                  * Override ethdev interrupt handle pointer with private
1050                  * handle instead of that of the parent PCI device used by
1051                  * default. This prevents it from being shared between all
1052                  * ports of the same PCI device since each of them is
1053                  * associated its own Verbs context.
1054                  *
1055                  * Rx interrupts in particular require this as the PMD has
1056                  * no control over the registration of queue interrupts
1057                  * besides setting up eth_dev->intr_handle, the rest is
1058                  * handled by rte_intr_rx_ctl().
1059                  */
1060                 eth_dev->intr_handle = &priv->intr_handle;
1061                 priv->dev_data = eth_dev->data;
1062                 eth_dev->dev_ops = &mlx4_dev_ops;
1063 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
1064                 /* Hint libmlx4 to use PMD allocator for data plane resources */
1065                 err = mlx4_glue->dv_set_context_attr
1066                         (ctx, MLX4DV_SET_CTX_ATTR_BUF_ALLOCATORS,
1067                          (void *)((uintptr_t)&(struct mlx4dv_ctx_allocators){
1068                                  .alloc = &mlx4_alloc_verbs_buf,
1069                                  .free = &mlx4_free_verbs_buf,
1070                                  .data = priv,
1071                         }));
1072                 if (err)
1073                         WARN("Verbs external allocator is not supported");
1074                 else
1075                         priv->verbs_alloc_ctx.enabled = 1;
1076 #endif
1077                 /* Bring Ethernet device up. */
1078                 DEBUG("forcing Ethernet interface up");
1079                 mlx4_dev_set_link_up(eth_dev);
1080                 /* Update link status once if waiting for LSC. */
1081                 if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
1082                         mlx4_link_update(eth_dev, 0);
1083                 /*
1084                  * Once the device is added to the list of memory event
1085                  * callback, its global MR cache table cannot be expanded
1086                  * on the fly because of deadlock. If it overflows, lookup
1087                  * should be done by searching MR list linearly, which is slow.
1088                  */
1089                 err = mlx4_mr_btree_init(&priv->mr.cache,
1090                                          MLX4_MR_BTREE_CACHE_N * 2,
1091                                          eth_dev->device->numa_node);
1092                 if (err) {
1093                         /* rte_errno is already set. */
1094                         goto port_error;
1095                 }
1096                 /* Add device to memory callback list. */
1097                 rte_rwlock_write_lock(&mlx4_shared_data->mem_event_rwlock);
1098                 LIST_INSERT_HEAD(&mlx4_shared_data->mem_event_cb_list,
1099                                  priv, mem_event_cb);
1100                 rte_rwlock_write_unlock(&mlx4_shared_data->mem_event_rwlock);
1101                 rte_eth_dev_probing_finish(eth_dev);
1102                 prev_dev = eth_dev;
1103                 continue;
1104 port_error:
1105                 rte_free(priv);
1106                 if (eth_dev != NULL)
1107                         eth_dev->data->dev_private = NULL;
1108                 if (pd)
1109                         claim_zero(mlx4_glue->dealloc_pd(pd));
1110                 if (ctx)
1111                         claim_zero(mlx4_glue->close_device(ctx));
1112                 if (eth_dev != NULL) {
1113                         /* mac_addrs must not be freed because part of dev_private */
1114                         eth_dev->data->mac_addrs = NULL;
1115                         rte_eth_dev_release_port(eth_dev);
1116                 }
1117                 if (prev_dev)
1118                         mlx4_dev_close(prev_dev);
1119                 break;
1120         }
1121 error:
1122         if (attr_ctx)
1123                 claim_zero(mlx4_glue->close_device(attr_ctx));
1124         if (list)
1125                 mlx4_glue->free_device_list(list);
1126         if (err)
1127                 rte_errno = err;
1128         return -err;
1129 }
1130
1131 /**
1132  * DPDK callback to remove a PCI device.
1133  *
1134  * This function removes all Ethernet devices belong to a given PCI device.
1135  *
1136  * @param[in] pci_dev
1137  *   Pointer to the PCI device.
1138  *
1139  * @return
1140  *   0 on success, the function cannot fail.
1141  */
1142 static int
1143 mlx4_pci_remove(struct rte_pci_device *pci_dev)
1144 {
1145         uint16_t port_id;
1146         int ret = 0;
1147
1148         RTE_ETH_FOREACH_DEV_OF(port_id, &pci_dev->device) {
1149                 /*
1150                  * mlx4_dev_close() is not registered to secondary process,
1151                  * call the close function explicitly for secondary process.
1152                  */
1153                 if (rte_eal_process_type() == RTE_PROC_SECONDARY)
1154                         ret |= mlx4_dev_close(&rte_eth_devices[port_id]);
1155                 else
1156                         ret |= rte_eth_dev_close(port_id);
1157         }
1158         return ret == 0 ? 0 : -EIO;
1159 }
1160
1161 static const struct rte_pci_id mlx4_pci_id_map[] = {
1162         {
1163                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1164                                PCI_DEVICE_ID_MELLANOX_CONNECTX3)
1165         },
1166         {
1167                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1168                                PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO)
1169         },
1170         {
1171                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1172                                PCI_DEVICE_ID_MELLANOX_CONNECTX3VF)
1173         },
1174         {
1175                 .vendor_id = 0
1176         }
1177 };
1178
1179 static struct rte_pci_driver mlx4_driver = {
1180         .driver = {
1181                 .name = MLX4_DRIVER_NAME
1182         },
1183         .id_table = mlx4_pci_id_map,
1184         .probe = mlx4_pci_probe,
1185         .remove = mlx4_pci_remove,
1186         .drv_flags = RTE_PCI_DRV_INTR_LSC | RTE_PCI_DRV_INTR_RMV,
1187 };
1188
1189 #ifdef RTE_IBVERBS_LINK_DLOPEN
1190
1191 /**
1192  * Suffix RTE_EAL_PMD_PATH with "-glue".
1193  *
1194  * This function performs a sanity check on RTE_EAL_PMD_PATH before
1195  * suffixing its last component.
1196  *
1197  * @param buf[out]
1198  *   Output buffer, should be large enough otherwise NULL is returned.
1199  * @param size
1200  *   Size of @p out.
1201  *
1202  * @return
1203  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
1204  */
1205 static char *
1206 mlx4_glue_path(char *buf, size_t size)
1207 {
1208         static const char *const bad[] = { "/", ".", "..", NULL };
1209         const char *path = RTE_EAL_PMD_PATH;
1210         size_t len = strlen(path);
1211         size_t off;
1212         int i;
1213
1214         while (len && path[len - 1] == '/')
1215                 --len;
1216         for (off = len; off && path[off - 1] != '/'; --off)
1217                 ;
1218         for (i = 0; bad[i]; ++i)
1219                 if (!strncmp(path + off, bad[i], (int)(len - off)))
1220                         goto error;
1221         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
1222         if (i == -1 || (size_t)i >= size)
1223                 goto error;
1224         return buf;
1225 error:
1226         ERROR("unable to append \"-glue\" to last component of"
1227               " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
1228               " please re-configure DPDK");
1229         return NULL;
1230 }
1231
1232 /**
1233  * Initialization routine for run-time dependency on rdma-core.
1234  */
1235 static int
1236 mlx4_glue_init(void)
1237 {
1238         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
1239         const char *path[] = {
1240                 /*
1241                  * A basic security check is necessary before trusting
1242                  * MLX4_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
1243                  */
1244                 (geteuid() == getuid() && getegid() == getgid() ?
1245                  getenv("MLX4_GLUE_PATH") : NULL),
1246                 /*
1247                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
1248                  * variant, otherwise let dlopen() look up libraries on its
1249                  * own.
1250                  */
1251                 (*RTE_EAL_PMD_PATH ?
1252                  mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
1253         };
1254         unsigned int i = 0;
1255         void *handle = NULL;
1256         void **sym;
1257         const char *dlmsg;
1258
1259         while (!handle && i != RTE_DIM(path)) {
1260                 const char *end;
1261                 size_t len;
1262                 int ret;
1263
1264                 if (!path[i]) {
1265                         ++i;
1266                         continue;
1267                 }
1268                 end = strpbrk(path[i], ":;");
1269                 if (!end)
1270                         end = path[i] + strlen(path[i]);
1271                 len = end - path[i];
1272                 ret = 0;
1273                 do {
1274                         char name[ret + 1];
1275
1276                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX4_GLUE,
1277                                        (int)len, path[i],
1278                                        (!len || *(end - 1) == '/') ? "" : "/");
1279                         if (ret == -1)
1280                                 break;
1281                         if (sizeof(name) != (size_t)ret + 1)
1282                                 continue;
1283                         DEBUG("looking for rdma-core glue as \"%s\"", name);
1284                         handle = dlopen(name, RTLD_LAZY);
1285                         break;
1286                 } while (1);
1287                 path[i] = end + 1;
1288                 if (!*end)
1289                         ++i;
1290         }
1291         if (!handle) {
1292                 rte_errno = EINVAL;
1293                 dlmsg = dlerror();
1294                 if (dlmsg)
1295                         WARN("cannot load glue library: %s", dlmsg);
1296                 goto glue_error;
1297         }
1298         sym = dlsym(handle, "mlx4_glue");
1299         if (!sym || !*sym) {
1300                 rte_errno = EINVAL;
1301                 dlmsg = dlerror();
1302                 if (dlmsg)
1303                         ERROR("cannot resolve glue symbol: %s", dlmsg);
1304                 goto glue_error;
1305         }
1306         mlx4_glue = *sym;
1307         return 0;
1308 glue_error:
1309         if (handle)
1310                 dlclose(handle);
1311         WARN("cannot initialize PMD due to missing run-time"
1312              " dependency on rdma-core libraries (libibverbs,"
1313              " libmlx4)");
1314         return -rte_errno;
1315 }
1316
1317 #endif
1318
1319 /* Initialize driver log type. */
1320 RTE_LOG_REGISTER_DEFAULT(mlx4_logtype, NOTICE)
1321
1322 /**
1323  * Driver initialization routine.
1324  */
1325 RTE_INIT(rte_mlx4_pmd_init)
1326 {
1327         /*
1328          * MLX4_DEVICE_FATAL_CLEANUP tells ibv_destroy functions we
1329          * want to get success errno value in case of calling them
1330          * when the device was removed.
1331          */
1332         setenv("MLX4_DEVICE_FATAL_CLEANUP", "1", 1);
1333         /*
1334          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
1335          * huge pages. Calling ibv_fork_init() during init allows
1336          * applications to use fork() safely for purposes other than
1337          * using this PMD, which is not supported in forked processes.
1338          */
1339         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
1340 #ifdef RTE_IBVERBS_LINK_DLOPEN
1341         if (mlx4_glue_init())
1342                 return;
1343         MLX4_ASSERT(mlx4_glue);
1344 #endif
1345 #ifdef RTE_LIBRTE_MLX4_DEBUG
1346         /* Glue structure must not contain any NULL pointers. */
1347         {
1348                 unsigned int i;
1349
1350                 for (i = 0; i != sizeof(*mlx4_glue) / sizeof(void *); ++i)
1351                         MLX4_ASSERT(((const void *const *)mlx4_glue)[i]);
1352         }
1353 #endif
1354         if (strcmp(mlx4_glue->version, MLX4_GLUE_VERSION)) {
1355                 ERROR("rdma-core glue \"%s\" mismatch: \"%s\" is required",
1356                       mlx4_glue->version, MLX4_GLUE_VERSION);
1357                 return;
1358         }
1359         mlx4_glue->fork_init();
1360         rte_pci_register(&mlx4_driver);
1361 }
1362
1363 RTE_PMD_EXPORT_NAME(net_mlx4, __COUNTER__);
1364 RTE_PMD_REGISTER_PCI_TABLE(net_mlx4, mlx4_pci_id_map);
1365 RTE_PMD_REGISTER_KMOD_DEP(net_mlx4,
1366         "* ib_uverbs & mlx4_en & mlx4_core & mlx4_ib");