1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2 /*
3  * Copyright(c) 2016 - 2018 Intel Corporation.
4  */
5 
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/dma-mapping.h>
9 #include "vt.h"
10 #include "cq.h"
11 #include "trace.h"
12 
13 #define RVT_UVERBS_ABI_VERSION 2
14 
15 MODULE_LICENSE("Dual BSD/GPL");
16 MODULE_DESCRIPTION("RDMA Verbs Transport Library");
17 
rvt_init(void)18 static int __init rvt_init(void)
19 {
20 	int ret = rvt_driver_cq_init();
21 
22 	if (ret)
23 		pr_err("Error in driver CQ init.\n");
24 
25 	return ret;
26 }
27 module_init(rvt_init);
28 
rvt_cleanup(void)29 static void __exit rvt_cleanup(void)
30 {
31 	rvt_cq_exit();
32 }
33 module_exit(rvt_cleanup);
34 
35 /**
36  * rvt_alloc_device - allocate rdi
37  * @size: how big of a structure to allocate
38  * @nports: number of ports to allocate array slots for
39  *
40  * Use IB core device alloc to allocate space for the rdi which is assumed to be
41  * inside of the ib_device. Any extra space that drivers require should be
42  * included in size.
43  *
44  * We also allocate a port array based on the number of ports.
45  *
46  * Return: pointer to allocated rdi
47  */
rvt_alloc_device(size_t size,int nports)48 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports)
49 {
50 	struct rvt_dev_info *rdi;
51 
52 	rdi = container_of(_ib_alloc_device(size), struct rvt_dev_info, ibdev);
53 	if (!rdi)
54 		return rdi;
55 
56 	rdi->ports = kcalloc(nports, sizeof(*rdi->ports), GFP_KERNEL);
57 	if (!rdi->ports)
58 		ib_dealloc_device(&rdi->ibdev);
59 
60 	return rdi;
61 }
62 EXPORT_SYMBOL(rvt_alloc_device);
63 
64 /**
65  * rvt_dealloc_device - deallocate rdi
66  * @rdi: structure to free
67  *
68  * Free a structure allocated with rvt_alloc_device()
69  */
rvt_dealloc_device(struct rvt_dev_info * rdi)70 void rvt_dealloc_device(struct rvt_dev_info *rdi)
71 {
72 	kfree(rdi->ports);
73 	ib_dealloc_device(&rdi->ibdev);
74 }
75 EXPORT_SYMBOL(rvt_dealloc_device);
76 
rvt_query_device(struct ib_device * ibdev,struct ib_device_attr * props,struct ib_udata * uhw)77 static int rvt_query_device(struct ib_device *ibdev,
78 			    struct ib_device_attr *props,
79 			    struct ib_udata *uhw)
80 {
81 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
82 
83 	if (uhw->inlen || uhw->outlen)
84 		return -EINVAL;
85 	/*
86 	 * Return rvt_dev_info.dparms.props contents
87 	 */
88 	*props = rdi->dparms.props;
89 	return 0;
90 }
91 
rvt_get_numa_node(struct ib_device * ibdev)92 static int rvt_get_numa_node(struct ib_device *ibdev)
93 {
94 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
95 
96 	return rdi->dparms.node;
97 }
98 
rvt_modify_device(struct ib_device * device,int device_modify_mask,struct ib_device_modify * device_modify)99 static int rvt_modify_device(struct ib_device *device,
100 			     int device_modify_mask,
101 			     struct ib_device_modify *device_modify)
102 {
103 	/*
104 	 * There is currently no need to supply this based on qib and hfi1.
105 	 * Future drivers may need to implement this though.
106 	 */
107 
108 	return -EOPNOTSUPP;
109 }
110 
111 /**
112  * rvt_query_port - Passes the query port call to the driver
113  * @ibdev: Verbs IB dev
114  * @port_num: port number, 1 based from ib core
115  * @props: structure to hold returned properties
116  *
117  * Return: 0 on success
118  */
rvt_query_port(struct ib_device * ibdev,u32 port_num,struct ib_port_attr * props)119 static int rvt_query_port(struct ib_device *ibdev, u32 port_num,
120 			  struct ib_port_attr *props)
121 {
122 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
123 	struct rvt_ibport *rvp;
124 	u32 port_index = ibport_num_to_idx(ibdev, port_num);
125 
126 	rvp = rdi->ports[port_index];
127 	/* props being zeroed by the caller, avoid zeroing it here */
128 	props->sm_lid = rvp->sm_lid;
129 	props->sm_sl = rvp->sm_sl;
130 	props->port_cap_flags = rvp->port_cap_flags;
131 	props->max_msg_sz = 0x80000000;
132 	props->pkey_tbl_len = rvt_get_npkeys(rdi);
133 	props->bad_pkey_cntr = rvp->pkey_violations;
134 	props->qkey_viol_cntr = rvp->qkey_violations;
135 	props->subnet_timeout = rvp->subnet_timeout;
136 	props->init_type_reply = 0;
137 
138 	/* Populate the remaining ib_port_attr elements */
139 	return rdi->driver_f.query_port_state(rdi, port_num, props);
140 }
141 
142 /**
143  * rvt_modify_port - modify port
144  * @ibdev: Verbs IB dev
145  * @port_num: Port number, 1 based from ib core
146  * @port_modify_mask: How to change the port
147  * @props: Structure to fill in
148  *
149  * Return: 0 on success
150  */
rvt_modify_port(struct ib_device * ibdev,u32 port_num,int port_modify_mask,struct ib_port_modify * props)151 static int rvt_modify_port(struct ib_device *ibdev, u32 port_num,
152 			   int port_modify_mask, struct ib_port_modify *props)
153 {
154 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
155 	struct rvt_ibport *rvp;
156 	int ret = 0;
157 	u32 port_index = ibport_num_to_idx(ibdev, port_num);
158 
159 	rvp = rdi->ports[port_index];
160 	if (port_modify_mask & IB_PORT_OPA_MASK_CHG) {
161 		rvp->port_cap3_flags |= props->set_port_cap_mask;
162 		rvp->port_cap3_flags &= ~props->clr_port_cap_mask;
163 	} else {
164 		rvp->port_cap_flags |= props->set_port_cap_mask;
165 		rvp->port_cap_flags &= ~props->clr_port_cap_mask;
166 	}
167 
168 	if (props->set_port_cap_mask || props->clr_port_cap_mask)
169 		rdi->driver_f.cap_mask_chg(rdi, port_num);
170 	if (port_modify_mask & IB_PORT_SHUTDOWN)
171 		ret = rdi->driver_f.shut_down_port(rdi, port_num);
172 	if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR)
173 		rvp->qkey_violations = 0;
174 
175 	return ret;
176 }
177 
178 /**
179  * rvt_query_pkey - Return a pkey from the table at a given index
180  * @ibdev: Verbs IB dev
181  * @port_num: Port number, 1 based from ib core
182  * @index: Index into pkey table
183  * @pkey: returned pkey from the port pkey table
184  *
185  * Return: 0 on failure pkey otherwise
186  */
rvt_query_pkey(struct ib_device * ibdev,u32 port_num,u16 index,u16 * pkey)187 static int rvt_query_pkey(struct ib_device *ibdev, u32 port_num, u16 index,
188 			  u16 *pkey)
189 {
190 	/*
191 	 * Driver will be responsible for keeping rvt_dev_info.pkey_table up to
192 	 * date. This function will just return that value. There is no need to
193 	 * lock, if a stale value is read and sent to the user so be it there is
194 	 * no way to protect against that anyway.
195 	 */
196 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
197 	u32 port_index;
198 
199 	port_index = ibport_num_to_idx(ibdev, port_num);
200 
201 	if (index >= rvt_get_npkeys(rdi))
202 		return -EINVAL;
203 
204 	*pkey = rvt_get_pkey(rdi, port_index, index);
205 	return 0;
206 }
207 
208 /**
209  * rvt_query_gid - Return a gid from the table
210  * @ibdev: Verbs IB dev
211  * @port_num: Port number, 1 based from ib core
212  * @guid_index: Index in table
213  * @gid: Gid to return
214  *
215  * Return: 0 on success
216  */
rvt_query_gid(struct ib_device * ibdev,u32 port_num,int guid_index,union ib_gid * gid)217 static int rvt_query_gid(struct ib_device *ibdev, u32 port_num,
218 			 int guid_index, union ib_gid *gid)
219 {
220 	struct rvt_dev_info *rdi;
221 	struct rvt_ibport *rvp;
222 	u32 port_index;
223 
224 	/*
225 	 * Driver is responsible for updating the guid table. Which will be used
226 	 * to craft the return value. This will work similar to how query_pkey()
227 	 * is being done.
228 	 */
229 	port_index = ibport_num_to_idx(ibdev, port_num);
230 
231 	rdi = ib_to_rvt(ibdev);
232 	rvp = rdi->ports[port_index];
233 
234 	gid->global.subnet_prefix = rvp->gid_prefix;
235 
236 	return rdi->driver_f.get_guid_be(rdi, rvp, guid_index,
237 					 &gid->global.interface_id);
238 }
239 
240 /**
241  * rvt_alloc_ucontext - Allocate a user context
242  * @uctx: Verbs context
243  * @udata: User data allocated
244  */
rvt_alloc_ucontext(struct ib_ucontext * uctx,struct ib_udata * udata)245 static int rvt_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
246 {
247 	return 0;
248 }
249 
250 /**
251  * rvt_dealloc_ucontext - Free a user context
252  * @context: Unused
253  */
rvt_dealloc_ucontext(struct ib_ucontext * context)254 static void rvt_dealloc_ucontext(struct ib_ucontext *context)
255 {
256 	return;
257 }
258 
rvt_get_port_immutable(struct ib_device * ibdev,u32 port_num,struct ib_port_immutable * immutable)259 static int rvt_get_port_immutable(struct ib_device *ibdev, u32 port_num,
260 				  struct ib_port_immutable *immutable)
261 {
262 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
263 	struct ib_port_attr attr;
264 	int err;
265 
266 	immutable->core_cap_flags = rdi->dparms.core_cap_flags;
267 
268 	err = ib_query_port(ibdev, port_num, &attr);
269 	if (err)
270 		return err;
271 
272 	immutable->pkey_tbl_len = attr.pkey_tbl_len;
273 	immutable->gid_tbl_len = attr.gid_tbl_len;
274 	immutable->max_mad_size = rdi->dparms.max_mad_size;
275 
276 	return 0;
277 }
278 
279 enum {
280 	MISC,
281 	QUERY_DEVICE,
282 	MODIFY_DEVICE,
283 	QUERY_PORT,
284 	MODIFY_PORT,
285 	QUERY_PKEY,
286 	QUERY_GID,
287 	ALLOC_UCONTEXT,
288 	DEALLOC_UCONTEXT,
289 	GET_PORT_IMMUTABLE,
290 	CREATE_QP,
291 	MODIFY_QP,
292 	DESTROY_QP,
293 	QUERY_QP,
294 	POST_SEND,
295 	POST_RECV,
296 	POST_SRQ_RECV,
297 	CREATE_AH,
298 	DESTROY_AH,
299 	MODIFY_AH,
300 	QUERY_AH,
301 	CREATE_SRQ,
302 	MODIFY_SRQ,
303 	DESTROY_SRQ,
304 	QUERY_SRQ,
305 	ATTACH_MCAST,
306 	DETACH_MCAST,
307 	GET_DMA_MR,
308 	REG_USER_MR,
309 	DEREG_MR,
310 	ALLOC_MR,
311 	MAP_MR_SG,
312 	ALLOC_FMR,
313 	MAP_PHYS_FMR,
314 	UNMAP_FMR,
315 	DEALLOC_FMR,
316 	MMAP,
317 	CREATE_CQ,
318 	DESTROY_CQ,
319 	POLL_CQ,
320 	REQ_NOTFIY_CQ,
321 	RESIZE_CQ,
322 	ALLOC_PD,
323 	DEALLOC_PD,
324 	_VERB_IDX_MAX /* Must always be last! */
325 };
326 
327 static const struct ib_device_ops rvt_dev_ops = {
328 	.uverbs_abi_ver = RVT_UVERBS_ABI_VERSION,
329 
330 	.alloc_mr = rvt_alloc_mr,
331 	.alloc_pd = rvt_alloc_pd,
332 	.alloc_ucontext = rvt_alloc_ucontext,
333 	.attach_mcast = rvt_attach_mcast,
334 	.create_ah = rvt_create_ah,
335 	.create_cq = rvt_create_cq,
336 	.create_qp = rvt_create_qp,
337 	.create_srq = rvt_create_srq,
338 	.create_user_ah = rvt_create_ah,
339 	.dealloc_pd = rvt_dealloc_pd,
340 	.dealloc_ucontext = rvt_dealloc_ucontext,
341 	.dereg_mr = rvt_dereg_mr,
342 	.destroy_ah = rvt_destroy_ah,
343 	.destroy_cq = rvt_destroy_cq,
344 	.destroy_qp = rvt_destroy_qp,
345 	.destroy_srq = rvt_destroy_srq,
346 	.detach_mcast = rvt_detach_mcast,
347 	.get_dma_mr = rvt_get_dma_mr,
348 	.get_numa_node = rvt_get_numa_node,
349 	.get_port_immutable = rvt_get_port_immutable,
350 	.map_mr_sg = rvt_map_mr_sg,
351 	.mmap = rvt_mmap,
352 	.modify_ah = rvt_modify_ah,
353 	.modify_device = rvt_modify_device,
354 	.modify_port = rvt_modify_port,
355 	.modify_qp = rvt_modify_qp,
356 	.modify_srq = rvt_modify_srq,
357 	.poll_cq = rvt_poll_cq,
358 	.post_recv = rvt_post_recv,
359 	.post_send = rvt_post_send,
360 	.post_srq_recv = rvt_post_srq_recv,
361 	.query_ah = rvt_query_ah,
362 	.query_device = rvt_query_device,
363 	.query_gid = rvt_query_gid,
364 	.query_pkey = rvt_query_pkey,
365 	.query_port = rvt_query_port,
366 	.query_qp = rvt_query_qp,
367 	.query_srq = rvt_query_srq,
368 	.reg_user_mr = rvt_reg_user_mr,
369 	.req_notify_cq = rvt_req_notify_cq,
370 	.resize_cq = rvt_resize_cq,
371 
372 	INIT_RDMA_OBJ_SIZE(ib_ah, rvt_ah, ibah),
373 	INIT_RDMA_OBJ_SIZE(ib_cq, rvt_cq, ibcq),
374 	INIT_RDMA_OBJ_SIZE(ib_pd, rvt_pd, ibpd),
375 	INIT_RDMA_OBJ_SIZE(ib_qp, rvt_qp, ibqp),
376 	INIT_RDMA_OBJ_SIZE(ib_srq, rvt_srq, ibsrq),
377 	INIT_RDMA_OBJ_SIZE(ib_ucontext, rvt_ucontext, ibucontext),
378 };
379 
check_support(struct rvt_dev_info * rdi,int verb)380 static noinline int check_support(struct rvt_dev_info *rdi, int verb)
381 {
382 	switch (verb) {
383 	case MISC:
384 		/*
385 		 * These functions are not part of verbs specifically but are
386 		 * required for rdmavt to function.
387 		 */
388 		if ((!rdi->ibdev.ops.port_groups) ||
389 		    (!rdi->driver_f.get_pci_dev))
390 			return -EINVAL;
391 		break;
392 
393 	case MODIFY_DEVICE:
394 		/*
395 		 * rdmavt does not support modify device currently drivers must
396 		 * provide.
397 		 */
398 		if (!rdi->ibdev.ops.modify_device)
399 			return -EOPNOTSUPP;
400 		break;
401 
402 	case QUERY_PORT:
403 		if (!rdi->ibdev.ops.query_port)
404 			if (!rdi->driver_f.query_port_state)
405 				return -EINVAL;
406 		break;
407 
408 	case MODIFY_PORT:
409 		if (!rdi->ibdev.ops.modify_port)
410 			if (!rdi->driver_f.cap_mask_chg ||
411 			    !rdi->driver_f.shut_down_port)
412 				return -EINVAL;
413 		break;
414 
415 	case QUERY_GID:
416 		if (!rdi->ibdev.ops.query_gid)
417 			if (!rdi->driver_f.get_guid_be)
418 				return -EINVAL;
419 		break;
420 
421 	case CREATE_QP:
422 		if (!rdi->ibdev.ops.create_qp)
423 			if (!rdi->driver_f.qp_priv_alloc ||
424 			    !rdi->driver_f.qp_priv_free ||
425 			    !rdi->driver_f.notify_qp_reset ||
426 			    !rdi->driver_f.flush_qp_waiters ||
427 			    !rdi->driver_f.stop_send_queue ||
428 			    !rdi->driver_f.quiesce_qp)
429 				return -EINVAL;
430 		break;
431 
432 	case MODIFY_QP:
433 		if (!rdi->ibdev.ops.modify_qp)
434 			if (!rdi->driver_f.notify_qp_reset ||
435 			    !rdi->driver_f.schedule_send ||
436 			    !rdi->driver_f.get_pmtu_from_attr ||
437 			    !rdi->driver_f.flush_qp_waiters ||
438 			    !rdi->driver_f.stop_send_queue ||
439 			    !rdi->driver_f.quiesce_qp ||
440 			    !rdi->driver_f.notify_error_qp ||
441 			    !rdi->driver_f.mtu_from_qp ||
442 			    !rdi->driver_f.mtu_to_path_mtu)
443 				return -EINVAL;
444 		break;
445 
446 	case DESTROY_QP:
447 		if (!rdi->ibdev.ops.destroy_qp)
448 			if (!rdi->driver_f.qp_priv_free ||
449 			    !rdi->driver_f.notify_qp_reset ||
450 			    !rdi->driver_f.flush_qp_waiters ||
451 			    !rdi->driver_f.stop_send_queue ||
452 			    !rdi->driver_f.quiesce_qp)
453 				return -EINVAL;
454 		break;
455 
456 	case POST_SEND:
457 		if (!rdi->ibdev.ops.post_send)
458 			if (!rdi->driver_f.schedule_send ||
459 			    !rdi->driver_f.do_send ||
460 			    !rdi->post_parms)
461 				return -EINVAL;
462 		break;
463 
464 	}
465 
466 	return 0;
467 }
468 
469 /**
470  * rvt_register_device - register a driver
471  * @rdi: main dev structure for all of rdmavt operations
472  *
473  * It is up to drivers to allocate the rdi and fill in the appropriate
474  * information.
475  *
476  * Return: 0 on success otherwise an errno.
477  */
rvt_register_device(struct rvt_dev_info * rdi)478 int rvt_register_device(struct rvt_dev_info *rdi)
479 {
480 	int ret = 0, i;
481 
482 	if (!rdi)
483 		return -EINVAL;
484 
485 	/*
486 	 * Check to ensure drivers have setup the required helpers for the verbs
487 	 * they want rdmavt to handle
488 	 */
489 	for (i = 0; i < _VERB_IDX_MAX; i++)
490 		if (check_support(rdi, i)) {
491 			pr_err("Driver support req not met at %d\n", i);
492 			return -EINVAL;
493 		}
494 
495 	ib_set_device_ops(&rdi->ibdev, &rvt_dev_ops);
496 
497 	/* Once we get past here we can use rvt_pr macros and tracepoints */
498 	trace_rvt_dbg(rdi, "Driver attempting registration");
499 	rvt_mmap_init(rdi);
500 
501 	/* Queue Pairs */
502 	ret = rvt_driver_qp_init(rdi);
503 	if (ret) {
504 		pr_err("Error in driver QP init.\n");
505 		return -EINVAL;
506 	}
507 
508 	/* Address Handle */
509 	spin_lock_init(&rdi->n_ahs_lock);
510 	rdi->n_ahs_allocated = 0;
511 
512 	/* Shared Receive Queue */
513 	rvt_driver_srq_init(rdi);
514 
515 	/* Multicast */
516 	rvt_driver_mcast_init(rdi);
517 
518 	/* Mem Region */
519 	ret = rvt_driver_mr_init(rdi);
520 	if (ret) {
521 		pr_err("Error in driver MR init.\n");
522 		goto bail_no_mr;
523 	}
524 
525 	/* Memory Working Set Size */
526 	ret = rvt_wss_init(rdi);
527 	if (ret) {
528 		rvt_pr_err(rdi, "Error in WSS init.\n");
529 		goto bail_mr;
530 	}
531 
532 	/* Completion queues */
533 	spin_lock_init(&rdi->n_cqs_lock);
534 
535 	/* Protection Domain */
536 	spin_lock_init(&rdi->n_pds_lock);
537 	rdi->n_pds_allocated = 0;
538 
539 	/*
540 	 * There are some things which could be set by underlying drivers but
541 	 * really should be up to rdmavt to set. For instance drivers can't know
542 	 * exactly which functions rdmavt supports, nor do they know the ABI
543 	 * version, so we do all of this sort of stuff here.
544 	 */
545 	rdi->ibdev.uverbs_cmd_mask |=
546 		(1ull << IB_USER_VERBS_CMD_POLL_CQ)             |
547 		(1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ)       |
548 		(1ull << IB_USER_VERBS_CMD_POST_SEND)           |
549 		(1ull << IB_USER_VERBS_CMD_POST_RECV)           |
550 		(1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
551 	rdi->ibdev.node_type = RDMA_NODE_IB_CA;
552 	if (!rdi->ibdev.num_comp_vectors)
553 		rdi->ibdev.num_comp_vectors = 1;
554 
555 	/* We are now good to announce we exist */
556 	ret = ib_register_device(&rdi->ibdev, dev_name(&rdi->ibdev.dev), NULL);
557 	if (ret) {
558 		rvt_pr_err(rdi, "Failed to register driver with ib core.\n");
559 		goto bail_wss;
560 	}
561 
562 	rvt_create_mad_agents(rdi);
563 
564 	rvt_pr_info(rdi, "Registration with rdmavt done.\n");
565 	return ret;
566 
567 bail_wss:
568 	rvt_wss_exit(rdi);
569 bail_mr:
570 	rvt_mr_exit(rdi);
571 
572 bail_no_mr:
573 	rvt_qp_exit(rdi);
574 
575 	return ret;
576 }
577 EXPORT_SYMBOL(rvt_register_device);
578 
579 /**
580  * rvt_unregister_device - remove a driver
581  * @rdi: rvt dev struct
582  */
rvt_unregister_device(struct rvt_dev_info * rdi)583 void rvt_unregister_device(struct rvt_dev_info *rdi)
584 {
585 	trace_rvt_dbg(rdi, "Driver is unregistering.");
586 	if (!rdi)
587 		return;
588 
589 	rvt_free_mad_agents(rdi);
590 
591 	ib_unregister_device(&rdi->ibdev);
592 	rvt_wss_exit(rdi);
593 	rvt_mr_exit(rdi);
594 	rvt_qp_exit(rdi);
595 }
596 EXPORT_SYMBOL(rvt_unregister_device);
597 
598 /**
599  * rvt_init_port - init internal data for driver port
600  * @rdi: rvt_dev_info struct
601  * @port: rvt port
602  * @port_index: 0 based index of ports, different from IB core port num
603  * @pkey_table: pkey_table for @port
604  *
605  * Keep track of a list of ports. No need to have a detach port.
606  * They persist until the driver goes away.
607  *
608  * Return: always 0
609  */
rvt_init_port(struct rvt_dev_info * rdi,struct rvt_ibport * port,int port_index,u16 * pkey_table)610 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,
611 		  int port_index, u16 *pkey_table)
612 {
613 
614 	rdi->ports[port_index] = port;
615 	rdi->ports[port_index]->pkey_table = pkey_table;
616 
617 	return 0;
618 }
619 EXPORT_SYMBOL(rvt_init_port);
620