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
 15MODULE_LICENSE("Dual BSD/GPL");
 16MODULE_DESCRIPTION("RDMA Verbs Transport Library");
 17
 18static 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}
 27module_init(rvt_init);
 28
 29static void __exit rvt_cleanup(void)
 30{
 31	rvt_cq_exit();
 32}
 33module_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 */
 48struct 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}
 62EXPORT_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 */
 70void rvt_dealloc_device(struct rvt_dev_info *rdi)
 71{
 72	kfree(rdi->ports);
 73	ib_dealloc_device(&rdi->ibdev);
 74}
 75EXPORT_SYMBOL(rvt_dealloc_device);
 76
 77static 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
 92static 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
 99static 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 */
119static 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 */
151static 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 */
187static 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 */
217static 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 */
245static 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 */
254static void rvt_dealloc_ucontext(struct ib_ucontext *context)
255{
256	return;
257}
258
259static 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
279enum {
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
327static 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
380static 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 */
478int 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
567bail_wss:
568	rvt_wss_exit(rdi);
569bail_mr:
570	rvt_mr_exit(rdi);
571
572bail_no_mr:
573	rvt_qp_exit(rdi);
574
575	return ret;
576}
577EXPORT_SYMBOL(rvt_register_device);
578
579/**
580 * rvt_unregister_device - remove a driver
581 * @rdi: rvt dev struct
582 */
583void 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}
596EXPORT_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 */
610int 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}
619EXPORT_SYMBOL(rvt_init_port);