1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2
3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4 /* Copyright (c) 2008-2019, IBM Corporation */
5
6 #include <linux/init.h>
7 #include <linux/errno.h>
8 #include <linux/netdevice.h>
9 #include <linux/inetdevice.h>
10 #include <net/net_namespace.h>
11 #include <linux/rtnetlink.h>
12 #include <linux/if_arp.h>
13 #include <linux/list.h>
14 #include <linux/kernel.h>
15 #include <linux/sched.h>
16 #include <linux/module.h>
17 #include <linux/dma-mapping.h>
18
19 #include <net/addrconf.h>
20 #include <rdma/ib_verbs.h>
21 #include <rdma/ib_user_verbs.h>
22 #include <rdma/rdma_netlink.h>
23 #include <linux/kthread.h>
24
25 #include "siw.h"
26 #include "siw_verbs.h"
27
28 MODULE_AUTHOR("Bernard Metzler");
29 MODULE_DESCRIPTION("Software iWARP Driver");
30 MODULE_LICENSE("Dual BSD/GPL");
31
32 /* transmit from user buffer, if possible */
33 const bool zcopy_tx = true;
34
35 /* Restrict usage of GSO, if hardware peer iwarp is unable to process
36 * large packets. try_gso = true lets siw try to use local GSO,
37 * if peer agrees. Not using GSO severly limits siw maximum tx bandwidth.
38 */
39 const bool try_gso;
40
41 /* Attach siw also with loopback devices */
42 const bool loopback_enabled = true;
43
44 /* We try to negotiate CRC on, if true */
45 const bool mpa_crc_required;
46
47 /* MPA CRC on/off enforced */
48 const bool mpa_crc_strict;
49
50 /* Control TCP_NODELAY socket option */
51 const bool siw_tcp_nagle;
52
53 /* Select MPA version to be used during connection setup */
54 u_char mpa_version = MPA_REVISION_2;
55
56 /* Selects MPA P2P mode (additional handshake during connection
57 * setup, if true.
58 */
59 const bool peer_to_peer;
60
61 struct task_struct *siw_tx_thread[NR_CPUS];
62 struct crypto_shash *siw_crypto_shash;
63
siw_device_register(struct siw_device * sdev,const char * name)64 static int siw_device_register(struct siw_device *sdev, const char *name)
65 {
66 struct ib_device *base_dev = &sdev->base_dev;
67 static int dev_id = 1;
68 int rv;
69
70 sdev->vendor_part_id = dev_id++;
71
72 rv = ib_register_device(base_dev, name, NULL);
73 if (rv) {
74 pr_warn("siw: device registration error %d\n", rv);
75 return rv;
76 }
77
78 siw_dbg(base_dev, "HWaddr=%pM\n", sdev->raw_gid);
79 return 0;
80 }
81
siw_device_cleanup(struct ib_device * base_dev)82 static void siw_device_cleanup(struct ib_device *base_dev)
83 {
84 struct siw_device *sdev = to_siw_dev(base_dev);
85
86 xa_destroy(&sdev->qp_xa);
87 xa_destroy(&sdev->mem_xa);
88 }
89
siw_dev_qualified(struct net_device * netdev)90 static int siw_dev_qualified(struct net_device *netdev)
91 {
92 /*
93 * Additional hardware support can be added here
94 * (e.g. ARPHRD_FDDI, ARPHRD_ATM, ...) - see
95 * <linux/if_arp.h> for type identifiers.
96 */
97 if (netdev->type == ARPHRD_ETHER || netdev->type == ARPHRD_IEEE802 ||
98 netdev->type == ARPHRD_NONE ||
99 (netdev->type == ARPHRD_LOOPBACK && loopback_enabled))
100 return 1;
101
102 return 0;
103 }
104
105 static DEFINE_PER_CPU(atomic_t, siw_use_cnt);
106
107 static struct {
108 struct cpumask **tx_valid_cpus;
109 int num_nodes;
110 } siw_cpu_info;
111
siw_init_cpulist(void)112 static int siw_init_cpulist(void)
113 {
114 int i, num_nodes = nr_node_ids;
115
116 memset(siw_tx_thread, 0, sizeof(siw_tx_thread));
117
118 siw_cpu_info.num_nodes = num_nodes;
119
120 siw_cpu_info.tx_valid_cpus =
121 kcalloc(num_nodes, sizeof(struct cpumask *), GFP_KERNEL);
122 if (!siw_cpu_info.tx_valid_cpus) {
123 siw_cpu_info.num_nodes = 0;
124 return -ENOMEM;
125 }
126 for (i = 0; i < siw_cpu_info.num_nodes; i++) {
127 siw_cpu_info.tx_valid_cpus[i] =
128 kzalloc(sizeof(struct cpumask), GFP_KERNEL);
129 if (!siw_cpu_info.tx_valid_cpus[i])
130 goto out_err;
131
132 cpumask_clear(siw_cpu_info.tx_valid_cpus[i]);
133 }
134 for_each_possible_cpu(i)
135 cpumask_set_cpu(i, siw_cpu_info.tx_valid_cpus[cpu_to_node(i)]);
136
137 return 0;
138
139 out_err:
140 siw_cpu_info.num_nodes = 0;
141 while (--i >= 0)
142 kfree(siw_cpu_info.tx_valid_cpus[i]);
143 kfree(siw_cpu_info.tx_valid_cpus);
144 siw_cpu_info.tx_valid_cpus = NULL;
145
146 return -ENOMEM;
147 }
148
siw_destroy_cpulist(void)149 static void siw_destroy_cpulist(void)
150 {
151 int i = 0;
152
153 while (i < siw_cpu_info.num_nodes)
154 kfree(siw_cpu_info.tx_valid_cpus[i++]);
155
156 kfree(siw_cpu_info.tx_valid_cpus);
157 }
158
159 /*
160 * Choose CPU with least number of active QP's from NUMA node of
161 * TX interface.
162 */
siw_get_tx_cpu(struct siw_device * sdev)163 int siw_get_tx_cpu(struct siw_device *sdev)
164 {
165 const struct cpumask *tx_cpumask;
166 int i, num_cpus, cpu, min_use, node = sdev->numa_node, tx_cpu = -1;
167
168 if (node < 0)
169 tx_cpumask = cpu_online_mask;
170 else
171 tx_cpumask = siw_cpu_info.tx_valid_cpus[node];
172
173 num_cpus = cpumask_weight(tx_cpumask);
174 if (!num_cpus) {
175 /* no CPU on this NUMA node */
176 tx_cpumask = cpu_online_mask;
177 num_cpus = cpumask_weight(tx_cpumask);
178 }
179 if (!num_cpus)
180 goto out;
181
182 cpu = cpumask_first(tx_cpumask);
183
184 for (i = 0, min_use = SIW_MAX_QP; i < num_cpus;
185 i++, cpu = cpumask_next(cpu, tx_cpumask)) {
186 int usage;
187
188 /* Skip any cores which have no TX thread */
189 if (!siw_tx_thread[cpu])
190 continue;
191
192 usage = atomic_read(&per_cpu(siw_use_cnt, cpu));
193 if (usage <= min_use) {
194 tx_cpu = cpu;
195 min_use = usage;
196 }
197 }
198 siw_dbg(&sdev->base_dev,
199 "tx cpu %d, node %d, %d qp's\n", tx_cpu, node, min_use);
200
201 out:
202 if (tx_cpu >= 0)
203 atomic_inc(&per_cpu(siw_use_cnt, tx_cpu));
204 else
205 pr_warn("siw: no tx cpu found\n");
206
207 return tx_cpu;
208 }
209
siw_put_tx_cpu(int cpu)210 void siw_put_tx_cpu(int cpu)
211 {
212 atomic_dec(&per_cpu(siw_use_cnt, cpu));
213 }
214
siw_get_base_qp(struct ib_device * base_dev,int id)215 static struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id)
216 {
217 struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id);
218
219 if (qp) {
220 /*
221 * siw_qp_id2obj() increments object reference count
222 */
223 siw_qp_put(qp);
224 return &qp->base_qp;
225 }
226 return NULL;
227 }
228
229 static const struct ib_device_ops siw_device_ops = {
230 .owner = THIS_MODULE,
231 .uverbs_abi_ver = SIW_ABI_VERSION,
232 .driver_id = RDMA_DRIVER_SIW,
233
234 .alloc_mr = siw_alloc_mr,
235 .alloc_pd = siw_alloc_pd,
236 .alloc_ucontext = siw_alloc_ucontext,
237 .create_cq = siw_create_cq,
238 .create_qp = siw_create_qp,
239 .create_srq = siw_create_srq,
240 .dealloc_driver = siw_device_cleanup,
241 .dealloc_pd = siw_dealloc_pd,
242 .dealloc_ucontext = siw_dealloc_ucontext,
243 .dereg_mr = siw_dereg_mr,
244 .destroy_cq = siw_destroy_cq,
245 .destroy_qp = siw_destroy_qp,
246 .destroy_srq = siw_destroy_srq,
247 .get_dma_mr = siw_get_dma_mr,
248 .get_port_immutable = siw_get_port_immutable,
249 .iw_accept = siw_accept,
250 .iw_add_ref = siw_qp_get_ref,
251 .iw_connect = siw_connect,
252 .iw_create_listen = siw_create_listen,
253 .iw_destroy_listen = siw_destroy_listen,
254 .iw_get_qp = siw_get_base_qp,
255 .iw_reject = siw_reject,
256 .iw_rem_ref = siw_qp_put_ref,
257 .map_mr_sg = siw_map_mr_sg,
258 .mmap = siw_mmap,
259 .mmap_free = siw_mmap_free,
260 .modify_qp = siw_verbs_modify_qp,
261 .modify_srq = siw_modify_srq,
262 .poll_cq = siw_poll_cq,
263 .post_recv = siw_post_receive,
264 .post_send = siw_post_send,
265 .post_srq_recv = siw_post_srq_recv,
266 .query_device = siw_query_device,
267 .query_gid = siw_query_gid,
268 .query_port = siw_query_port,
269 .query_qp = siw_query_qp,
270 .query_srq = siw_query_srq,
271 .req_notify_cq = siw_req_notify_cq,
272 .reg_user_mr = siw_reg_user_mr,
273
274 INIT_RDMA_OBJ_SIZE(ib_cq, siw_cq, base_cq),
275 INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd),
276 INIT_RDMA_OBJ_SIZE(ib_qp, siw_qp, base_qp),
277 INIT_RDMA_OBJ_SIZE(ib_srq, siw_srq, base_srq),
278 INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext),
279 };
280
siw_device_create(struct net_device * netdev)281 static struct siw_device *siw_device_create(struct net_device *netdev)
282 {
283 struct siw_device *sdev = NULL;
284 struct ib_device *base_dev;
285 int rv;
286
287 sdev = ib_alloc_device(siw_device, base_dev);
288 if (!sdev)
289 return NULL;
290
291 base_dev = &sdev->base_dev;
292 sdev->netdev = netdev;
293
294 if (netdev->addr_len) {
295 memcpy(sdev->raw_gid, netdev->dev_addr,
296 min_t(unsigned int, netdev->addr_len, ETH_ALEN));
297 } else {
298 /*
299 * This device does not have a HW address, but
300 * connection mangagement requires a unique gid.
301 */
302 eth_random_addr(sdev->raw_gid);
303 }
304 addrconf_addr_eui48((u8 *)&base_dev->node_guid, sdev->raw_gid);
305
306 base_dev->uverbs_cmd_mask |= BIT_ULL(IB_USER_VERBS_CMD_POST_SEND);
307
308 base_dev->node_type = RDMA_NODE_RNIC;
309 memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON,
310 sizeof(SIW_NODE_DESC_COMMON));
311
312 /*
313 * Current model (one-to-one device association):
314 * One Softiwarp device per net_device or, equivalently,
315 * per physical port.
316 */
317 base_dev->phys_port_cnt = 1;
318 base_dev->num_comp_vectors = num_possible_cpus();
319
320 xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1);
321 xa_init_flags(&sdev->mem_xa, XA_FLAGS_ALLOC1);
322
323 ib_set_device_ops(base_dev, &siw_device_ops);
324 rv = ib_device_set_netdev(base_dev, netdev, 1);
325 if (rv)
326 goto error;
327
328 memcpy(base_dev->iw_ifname, netdev->name,
329 sizeof(base_dev->iw_ifname));
330
331 /* Disable TCP port mapping */
332 base_dev->iw_driver_flags = IW_F_NO_PORT_MAP;
333
334 sdev->attrs.max_qp = SIW_MAX_QP;
335 sdev->attrs.max_qp_wr = SIW_MAX_QP_WR;
336 sdev->attrs.max_ord = SIW_MAX_ORD_QP;
337 sdev->attrs.max_ird = SIW_MAX_IRD_QP;
338 sdev->attrs.max_sge = SIW_MAX_SGE;
339 sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD;
340 sdev->attrs.max_cq = SIW_MAX_CQ;
341 sdev->attrs.max_cqe = SIW_MAX_CQE;
342 sdev->attrs.max_mr = SIW_MAX_MR;
343 sdev->attrs.max_pd = SIW_MAX_PD;
344 sdev->attrs.max_mw = SIW_MAX_MW;
345 sdev->attrs.max_srq = SIW_MAX_SRQ;
346 sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR;
347 sdev->attrs.max_srq_sge = SIW_MAX_SGE;
348
349 INIT_LIST_HEAD(&sdev->cep_list);
350 INIT_LIST_HEAD(&sdev->qp_list);
351
352 atomic_set(&sdev->num_ctx, 0);
353 atomic_set(&sdev->num_srq, 0);
354 atomic_set(&sdev->num_qp, 0);
355 atomic_set(&sdev->num_cq, 0);
356 atomic_set(&sdev->num_mr, 0);
357 atomic_set(&sdev->num_pd, 0);
358
359 sdev->numa_node = dev_to_node(&netdev->dev);
360 spin_lock_init(&sdev->lock);
361
362 return sdev;
363 error:
364 ib_dealloc_device(base_dev);
365
366 return NULL;
367 }
368
369 /*
370 * Network link becomes unavailable. Mark all
371 * affected QP's accordingly.
372 */
siw_netdev_down(struct work_struct * work)373 static void siw_netdev_down(struct work_struct *work)
374 {
375 struct siw_device *sdev =
376 container_of(work, struct siw_device, netdev_down);
377
378 struct siw_qp_attrs qp_attrs;
379 struct list_head *pos, *tmp;
380
381 memset(&qp_attrs, 0, sizeof(qp_attrs));
382 qp_attrs.state = SIW_QP_STATE_ERROR;
383
384 list_for_each_safe(pos, tmp, &sdev->qp_list) {
385 struct siw_qp *qp = list_entry(pos, struct siw_qp, devq);
386
387 down_write(&qp->state_lock);
388 WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE));
389 up_write(&qp->state_lock);
390 }
391 ib_device_put(&sdev->base_dev);
392 }
393
siw_device_goes_down(struct siw_device * sdev)394 static void siw_device_goes_down(struct siw_device *sdev)
395 {
396 if (ib_device_try_get(&sdev->base_dev)) {
397 INIT_WORK(&sdev->netdev_down, siw_netdev_down);
398 schedule_work(&sdev->netdev_down);
399 }
400 }
401
siw_netdev_event(struct notifier_block * nb,unsigned long event,void * arg)402 static int siw_netdev_event(struct notifier_block *nb, unsigned long event,
403 void *arg)
404 {
405 struct net_device *netdev = netdev_notifier_info_to_dev(arg);
406 struct ib_device *base_dev;
407 struct siw_device *sdev;
408
409 dev_dbg(&netdev->dev, "siw: event %lu\n", event);
410
411 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
412 if (!base_dev)
413 return NOTIFY_OK;
414
415 sdev = to_siw_dev(base_dev);
416
417 switch (event) {
418 case NETDEV_UP:
419 sdev->state = IB_PORT_ACTIVE;
420 siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE);
421 break;
422
423 case NETDEV_GOING_DOWN:
424 siw_device_goes_down(sdev);
425 break;
426
427 case NETDEV_DOWN:
428 sdev->state = IB_PORT_DOWN;
429 siw_port_event(sdev, 1, IB_EVENT_PORT_ERR);
430 break;
431
432 case NETDEV_REGISTER:
433 /*
434 * Device registration now handled only by
435 * rdma netlink commands. So it shall be impossible
436 * to end up here with a valid siw device.
437 */
438 siw_dbg(base_dev, "unexpected NETDEV_REGISTER event\n");
439 break;
440
441 case NETDEV_UNREGISTER:
442 ib_unregister_device_queued(&sdev->base_dev);
443 break;
444
445 case NETDEV_CHANGEADDR:
446 siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE);
447 break;
448 /*
449 * Todo: Below netdev events are currently not handled.
450 */
451 case NETDEV_CHANGEMTU:
452 case NETDEV_CHANGE:
453 break;
454
455 default:
456 break;
457 }
458 ib_device_put(&sdev->base_dev);
459
460 return NOTIFY_OK;
461 }
462
463 static struct notifier_block siw_netdev_nb = {
464 .notifier_call = siw_netdev_event,
465 };
466
siw_newlink(const char * basedev_name,struct net_device * netdev)467 static int siw_newlink(const char *basedev_name, struct net_device *netdev)
468 {
469 struct ib_device *base_dev;
470 struct siw_device *sdev = NULL;
471 int rv = -ENOMEM;
472
473 if (!siw_dev_qualified(netdev))
474 return -EINVAL;
475
476 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
477 if (base_dev) {
478 ib_device_put(base_dev);
479 return -EEXIST;
480 }
481 sdev = siw_device_create(netdev);
482 if (sdev) {
483 dev_dbg(&netdev->dev, "siw: new device\n");
484
485 if (netif_running(netdev) && netif_carrier_ok(netdev))
486 sdev->state = IB_PORT_ACTIVE;
487 else
488 sdev->state = IB_PORT_DOWN;
489
490 rv = siw_device_register(sdev, basedev_name);
491 if (rv)
492 ib_dealloc_device(&sdev->base_dev);
493 }
494 return rv;
495 }
496
497 static struct rdma_link_ops siw_link_ops = {
498 .type = "siw",
499 .newlink = siw_newlink,
500 };
501
502 /*
503 * siw_init_module - Initialize Softiwarp module and register with netdev
504 * subsystem.
505 */
siw_init_module(void)506 static __init int siw_init_module(void)
507 {
508 int rv;
509
510 if (SENDPAGE_THRESH < SIW_MAX_INLINE) {
511 pr_info("siw: sendpage threshold too small: %u\n",
512 (int)SENDPAGE_THRESH);
513 rv = -EINVAL;
514 goto out_error;
515 }
516 rv = siw_init_cpulist();
517 if (rv)
518 goto out_error;
519
520 rv = siw_cm_init();
521 if (rv)
522 goto out_error;
523
524 if (!siw_create_tx_threads()) {
525 pr_info("siw: Could not start any TX thread\n");
526 rv = -ENOMEM;
527 goto out_error;
528 }
529 /*
530 * Locate CRC32 algorithm. If unsuccessful, fail
531 * loading siw only, if CRC is required.
532 */
533 siw_crypto_shash = crypto_alloc_shash("crc32c", 0, 0);
534 if (IS_ERR(siw_crypto_shash)) {
535 pr_info("siw: Loading CRC32c failed: %ld\n",
536 PTR_ERR(siw_crypto_shash));
537 siw_crypto_shash = NULL;
538 if (mpa_crc_required) {
539 rv = -EOPNOTSUPP;
540 goto out_error;
541 }
542 }
543 rv = register_netdevice_notifier(&siw_netdev_nb);
544 if (rv)
545 goto out_error;
546
547 rdma_link_register(&siw_link_ops);
548
549 pr_info("SoftiWARP attached\n");
550 return 0;
551
552 out_error:
553 siw_stop_tx_threads();
554
555 if (siw_crypto_shash)
556 crypto_free_shash(siw_crypto_shash);
557
558 pr_info("SoftIWARP attach failed. Error: %d\n", rv);
559
560 siw_cm_exit();
561 siw_destroy_cpulist();
562
563 return rv;
564 }
565
siw_exit_module(void)566 static void __exit siw_exit_module(void)
567 {
568 siw_stop_tx_threads();
569
570 unregister_netdevice_notifier(&siw_netdev_nb);
571 rdma_link_unregister(&siw_link_ops);
572 ib_unregister_driver(RDMA_DRIVER_SIW);
573
574 siw_cm_exit();
575
576 siw_destroy_cpulist();
577
578 if (siw_crypto_shash)
579 crypto_free_shash(siw_crypto_shash);
580
581 pr_info("SoftiWARP detached\n");
582 }
583
584 module_init(siw_init_module);
585 module_exit(siw_exit_module);
586
587 MODULE_ALIAS_RDMA_LINK("siw");
588