1 /*
2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  */
33 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/errno.h>
37 
38 #include <rdma/ib_user_verbs.h>
39 #include <rdma/ib_addr.h>
40 #include <rdma/uverbs_ioctl.h>
41 
42 #include "usnic_abi.h"
43 #include "usnic_ib.h"
44 #include "usnic_common_util.h"
45 #include "usnic_ib_qp_grp.h"
46 #include "usnic_ib_verbs.h"
47 #include "usnic_fwd.h"
48 #include "usnic_log.h"
49 #include "usnic_uiom.h"
50 #include "usnic_transport.h"
51 
52 #define USNIC_DEFAULT_TRANSPORT USNIC_TRANSPORT_ROCE_CUSTOM
53 
54 const struct usnic_vnic_res_spec min_transport_spec[USNIC_TRANSPORT_MAX] = {
55 	{ /*USNIC_TRANSPORT_UNKNOWN*/
56 		.resources = {
57 			{.type = USNIC_VNIC_RES_TYPE_EOL,	.cnt = 0,},
58 		},
59 	},
60 	{ /*USNIC_TRANSPORT_ROCE_CUSTOM*/
61 		.resources = {
62 			{.type = USNIC_VNIC_RES_TYPE_WQ,	.cnt = 1,},
63 			{.type = USNIC_VNIC_RES_TYPE_RQ,	.cnt = 1,},
64 			{.type = USNIC_VNIC_RES_TYPE_CQ,	.cnt = 1,},
65 			{.type = USNIC_VNIC_RES_TYPE_EOL,	.cnt = 0,},
66 		},
67 	},
68 	{ /*USNIC_TRANSPORT_IPV4_UDP*/
69 		.resources = {
70 			{.type = USNIC_VNIC_RES_TYPE_WQ,	.cnt = 1,},
71 			{.type = USNIC_VNIC_RES_TYPE_RQ,	.cnt = 1,},
72 			{.type = USNIC_VNIC_RES_TYPE_CQ,	.cnt = 1,},
73 			{.type = USNIC_VNIC_RES_TYPE_EOL,	.cnt = 0,},
74 		},
75 	},
76 };
77 
78 static void usnic_ib_fw_string_to_u64(char *fw_ver_str, u64 *fw_ver)
79 {
80 	*fw_ver = *((u64 *)fw_ver_str);
81 }
82 
83 static int usnic_ib_fill_create_qp_resp(struct usnic_ib_qp_grp *qp_grp,
84 					struct ib_udata *udata)
85 {
86 	struct usnic_ib_dev *us_ibdev;
87 	struct usnic_ib_create_qp_resp resp;
88 	struct pci_dev *pdev;
89 	struct vnic_dev_bar *bar;
90 	struct usnic_vnic_res_chunk *chunk;
91 	struct usnic_ib_qp_grp_flow *default_flow;
92 	int i, err;
93 
94 	memset(&resp, 0, sizeof(resp));
95 
96 	us_ibdev = qp_grp->vf->pf;
97 	pdev = usnic_vnic_get_pdev(qp_grp->vf->vnic);
98 	if (!pdev) {
99 		usnic_err("Failed to get pdev of qp_grp %d\n",
100 				qp_grp->grp_id);
101 		return -EFAULT;
102 	}
103 
104 	bar = usnic_vnic_get_bar(qp_grp->vf->vnic, 0);
105 	if (!bar) {
106 		usnic_err("Failed to get bar0 of qp_grp %d vf %s",
107 				qp_grp->grp_id, pci_name(pdev));
108 		return -EFAULT;
109 	}
110 
111 	resp.vfid = usnic_vnic_get_index(qp_grp->vf->vnic);
112 	resp.bar_bus_addr = bar->bus_addr;
113 	resp.bar_len = bar->len;
114 
115 	chunk = usnic_ib_qp_grp_get_chunk(qp_grp, USNIC_VNIC_RES_TYPE_RQ);
116 	if (IS_ERR(chunk)) {
117 		usnic_err("Failed to get chunk %s for qp_grp %d with err %ld\n",
118 			usnic_vnic_res_type_to_str(USNIC_VNIC_RES_TYPE_RQ),
119 			qp_grp->grp_id,
120 			PTR_ERR(chunk));
121 		return PTR_ERR(chunk);
122 	}
123 
124 	WARN_ON(chunk->type != USNIC_VNIC_RES_TYPE_RQ);
125 	resp.rq_cnt = chunk->cnt;
126 	for (i = 0; i < chunk->cnt; i++)
127 		resp.rq_idx[i] = chunk->res[i]->vnic_idx;
128 
129 	chunk = usnic_ib_qp_grp_get_chunk(qp_grp, USNIC_VNIC_RES_TYPE_WQ);
130 	if (IS_ERR(chunk)) {
131 		usnic_err("Failed to get chunk %s for qp_grp %d with err %ld\n",
132 			usnic_vnic_res_type_to_str(USNIC_VNIC_RES_TYPE_WQ),
133 			qp_grp->grp_id,
134 			PTR_ERR(chunk));
135 		return PTR_ERR(chunk);
136 	}
137 
138 	WARN_ON(chunk->type != USNIC_VNIC_RES_TYPE_WQ);
139 	resp.wq_cnt = chunk->cnt;
140 	for (i = 0; i < chunk->cnt; i++)
141 		resp.wq_idx[i] = chunk->res[i]->vnic_idx;
142 
143 	chunk = usnic_ib_qp_grp_get_chunk(qp_grp, USNIC_VNIC_RES_TYPE_CQ);
144 	if (IS_ERR(chunk)) {
145 		usnic_err("Failed to get chunk %s for qp_grp %d with err %ld\n",
146 			usnic_vnic_res_type_to_str(USNIC_VNIC_RES_TYPE_CQ),
147 			qp_grp->grp_id,
148 			PTR_ERR(chunk));
149 		return PTR_ERR(chunk);
150 	}
151 
152 	WARN_ON(chunk->type != USNIC_VNIC_RES_TYPE_CQ);
153 	resp.cq_cnt = chunk->cnt;
154 	for (i = 0; i < chunk->cnt; i++)
155 		resp.cq_idx[i] = chunk->res[i]->vnic_idx;
156 
157 	default_flow = list_first_entry(&qp_grp->flows_lst,
158 					struct usnic_ib_qp_grp_flow, link);
159 	resp.transport = default_flow->trans_type;
160 
161 	err = ib_copy_to_udata(udata, &resp, sizeof(resp));
162 	if (err) {
163 		usnic_err("Failed to copy udata for %s",
164 			  dev_name(&us_ibdev->ib_dev.dev));
165 		return err;
166 	}
167 
168 	return 0;
169 }
170 
171 static struct usnic_ib_qp_grp*
172 find_free_vf_and_create_qp_grp(struct usnic_ib_dev *us_ibdev,
173 				struct usnic_ib_pd *pd,
174 				struct usnic_transport_spec *trans_spec,
175 				struct usnic_vnic_res_spec *res_spec)
176 {
177 	struct usnic_ib_vf *vf;
178 	struct usnic_vnic *vnic;
179 	struct usnic_ib_qp_grp *qp_grp;
180 	struct device *dev, **dev_list;
181 	int i;
182 
183 	BUG_ON(!mutex_is_locked(&us_ibdev->usdev_lock));
184 
185 	if (list_empty(&us_ibdev->vf_dev_list)) {
186 		usnic_info("No vfs to allocate\n");
187 		return NULL;
188 	}
189 
190 	if (usnic_ib_share_vf) {
191 		/* Try to find resouces on a used vf which is in pd */
192 		dev_list = usnic_uiom_get_dev_list(pd->umem_pd);
193 		if (IS_ERR(dev_list))
194 			return ERR_CAST(dev_list);
195 		for (i = 0; dev_list[i]; i++) {
196 			dev = dev_list[i];
197 			vf = dev_get_drvdata(dev);
198 			spin_lock(&vf->lock);
199 			vnic = vf->vnic;
200 			if (!usnic_vnic_check_room(vnic, res_spec)) {
201 				usnic_dbg("Found used vnic %s from %s\n",
202 						dev_name(&us_ibdev->ib_dev.dev),
203 						pci_name(usnic_vnic_get_pdev(
204 									vnic)));
205 				qp_grp = usnic_ib_qp_grp_create(us_ibdev->ufdev,
206 								vf, pd,
207 								res_spec,
208 								trans_spec);
209 
210 				spin_unlock(&vf->lock);
211 				goto qp_grp_check;
212 			}
213 			spin_unlock(&vf->lock);
214 
215 		}
216 		usnic_uiom_free_dev_list(dev_list);
217 	}
218 
219 	/* Try to find resources on an unused vf */
220 	list_for_each_entry(vf, &us_ibdev->vf_dev_list, link) {
221 		spin_lock(&vf->lock);
222 		vnic = vf->vnic;
223 		if (vf->qp_grp_ref_cnt == 0 &&
224 		    usnic_vnic_check_room(vnic, res_spec) == 0) {
225 			qp_grp = usnic_ib_qp_grp_create(us_ibdev->ufdev, vf,
226 							pd, res_spec,
227 							trans_spec);
228 
229 			spin_unlock(&vf->lock);
230 			goto qp_grp_check;
231 		}
232 		spin_unlock(&vf->lock);
233 	}
234 
235 	usnic_info("No free qp grp found on %s\n",
236 		   dev_name(&us_ibdev->ib_dev.dev));
237 	return ERR_PTR(-ENOMEM);
238 
239 qp_grp_check:
240 	if (IS_ERR_OR_NULL(qp_grp)) {
241 		usnic_err("Failed to allocate qp_grp\n");
242 		return ERR_PTR(qp_grp ? PTR_ERR(qp_grp) : -ENOMEM);
243 	}
244 	return qp_grp;
245 }
246 
247 static void qp_grp_destroy(struct usnic_ib_qp_grp *qp_grp)
248 {
249 	struct usnic_ib_vf *vf = qp_grp->vf;
250 
251 	WARN_ON(qp_grp->state != IB_QPS_RESET);
252 
253 	spin_lock(&vf->lock);
254 	usnic_ib_qp_grp_destroy(qp_grp);
255 	spin_unlock(&vf->lock);
256 }
257 
258 static int create_qp_validate_user_data(struct usnic_ib_create_qp_cmd cmd)
259 {
260 	if (cmd.spec.trans_type <= USNIC_TRANSPORT_UNKNOWN ||
261 			cmd.spec.trans_type >= USNIC_TRANSPORT_MAX)
262 		return -EINVAL;
263 
264 	return 0;
265 }
266 
267 /* Start of ib callback functions */
268 
269 enum rdma_link_layer usnic_ib_port_link_layer(struct ib_device *device,
270 						u8 port_num)
271 {
272 	return IB_LINK_LAYER_ETHERNET;
273 }
274 
275 int usnic_ib_query_device(struct ib_device *ibdev,
276 			  struct ib_device_attr *props,
277 			  struct ib_udata *uhw)
278 {
279 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
280 	union ib_gid gid;
281 	struct ethtool_drvinfo info;
282 	int qp_per_vf;
283 
284 	usnic_dbg("\n");
285 	if (uhw->inlen || uhw->outlen)
286 		return -EINVAL;
287 
288 	mutex_lock(&us_ibdev->usdev_lock);
289 	us_ibdev->netdev->ethtool_ops->get_drvinfo(us_ibdev->netdev, &info);
290 	memset(props, 0, sizeof(*props));
291 	usnic_mac_ip_to_gid(us_ibdev->ufdev->mac, us_ibdev->ufdev->inaddr,
292 			&gid.raw[0]);
293 	memcpy(&props->sys_image_guid, &gid.global.interface_id,
294 		sizeof(gid.global.interface_id));
295 	usnic_ib_fw_string_to_u64(&info.fw_version[0], &props->fw_ver);
296 	props->max_mr_size = USNIC_UIOM_MAX_MR_SIZE;
297 	props->page_size_cap = USNIC_UIOM_PAGE_SIZE;
298 	props->vendor_id = PCI_VENDOR_ID_CISCO;
299 	props->vendor_part_id = PCI_DEVICE_ID_CISCO_VIC_USPACE_NIC;
300 	props->hw_ver = us_ibdev->pdev->subsystem_device;
301 	qp_per_vf = max(us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_WQ],
302 			us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_RQ]);
303 	props->max_qp = qp_per_vf *
304 		kref_read(&us_ibdev->vf_cnt);
305 	props->device_cap_flags = IB_DEVICE_PORT_ACTIVE_EVENT |
306 		IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_BLOCK_MULTICAST_LOOPBACK;
307 	props->max_cq = us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_CQ] *
308 		kref_read(&us_ibdev->vf_cnt);
309 	props->max_pd = USNIC_UIOM_MAX_PD_CNT;
310 	props->max_mr = USNIC_UIOM_MAX_MR_CNT;
311 	props->local_ca_ack_delay = 0;
312 	props->max_pkeys = 0;
313 	props->atomic_cap = IB_ATOMIC_NONE;
314 	props->masked_atomic_cap = props->atomic_cap;
315 	props->max_qp_rd_atom = 0;
316 	props->max_qp_init_rd_atom = 0;
317 	props->max_res_rd_atom = 0;
318 	props->max_srq = 0;
319 	props->max_srq_wr = 0;
320 	props->max_srq_sge = 0;
321 	props->max_fast_reg_page_list_len = 0;
322 	props->max_mcast_grp = 0;
323 	props->max_mcast_qp_attach = 0;
324 	props->max_total_mcast_qp_attach = 0;
325 	/* Owned by Userspace
326 	 * max_qp_wr, max_sge, max_sge_rd, max_cqe */
327 	mutex_unlock(&us_ibdev->usdev_lock);
328 
329 	return 0;
330 }
331 
332 int usnic_ib_query_port(struct ib_device *ibdev, u8 port,
333 				struct ib_port_attr *props)
334 {
335 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
336 
337 	usnic_dbg("\n");
338 
339 	if (ib_get_eth_speed(ibdev, port, &props->active_speed,
340 			     &props->active_width))
341 		return -EINVAL;
342 
343 	/*
344 	 * usdev_lock is acquired after (and not before) ib_get_eth_speed call
345 	 * because acquiring rtnl_lock in ib_get_eth_speed, while holding
346 	 * usdev_lock could lead to a deadlock.
347 	 */
348 	mutex_lock(&us_ibdev->usdev_lock);
349 	/* props being zeroed by the caller, avoid zeroing it here */
350 
351 	props->lid = 0;
352 	props->lmc = 1;
353 	props->sm_lid = 0;
354 	props->sm_sl = 0;
355 
356 	if (!us_ibdev->ufdev->link_up) {
357 		props->state = IB_PORT_DOWN;
358 		props->phys_state = IB_PORT_PHYS_STATE_DISABLED;
359 	} else if (!us_ibdev->ufdev->inaddr) {
360 		props->state = IB_PORT_INIT;
361 		props->phys_state =
362 			IB_PORT_PHYS_STATE_PORT_CONFIGURATION_TRAINING;
363 	} else {
364 		props->state = IB_PORT_ACTIVE;
365 		props->phys_state = IB_PORT_PHYS_STATE_LINK_UP;
366 	}
367 
368 	props->port_cap_flags = 0;
369 	props->gid_tbl_len = 1;
370 	props->pkey_tbl_len = 1;
371 	props->bad_pkey_cntr = 0;
372 	props->qkey_viol_cntr = 0;
373 	props->max_mtu = IB_MTU_4096;
374 	props->active_mtu = iboe_get_mtu(us_ibdev->ufdev->mtu);
375 	/* Userspace will adjust for hdrs */
376 	props->max_msg_sz = us_ibdev->ufdev->mtu;
377 	props->max_vl_num = 1;
378 	mutex_unlock(&us_ibdev->usdev_lock);
379 
380 	return 0;
381 }
382 
383 int usnic_ib_query_qp(struct ib_qp *qp, struct ib_qp_attr *qp_attr,
384 				int qp_attr_mask,
385 				struct ib_qp_init_attr *qp_init_attr)
386 {
387 	struct usnic_ib_qp_grp *qp_grp;
388 	struct usnic_ib_vf *vf;
389 	int err;
390 
391 	usnic_dbg("\n");
392 
393 	memset(qp_attr, 0, sizeof(*qp_attr));
394 	memset(qp_init_attr, 0, sizeof(*qp_init_attr));
395 
396 	qp_grp = to_uqp_grp(qp);
397 	vf = qp_grp->vf;
398 	mutex_lock(&vf->pf->usdev_lock);
399 	usnic_dbg("\n");
400 	qp_attr->qp_state = qp_grp->state;
401 	qp_attr->cur_qp_state = qp_grp->state;
402 
403 	switch (qp_grp->ibqp.qp_type) {
404 	case IB_QPT_UD:
405 		qp_attr->qkey = 0;
406 		break;
407 	default:
408 		usnic_err("Unexpected qp_type %d\n", qp_grp->ibqp.qp_type);
409 		err = -EINVAL;
410 		goto err_out;
411 	}
412 
413 	mutex_unlock(&vf->pf->usdev_lock);
414 	return 0;
415 
416 err_out:
417 	mutex_unlock(&vf->pf->usdev_lock);
418 	return err;
419 }
420 
421 int usnic_ib_query_gid(struct ib_device *ibdev, u8 port, int index,
422 				union ib_gid *gid)
423 {
424 
425 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
426 	usnic_dbg("\n");
427 
428 	if (index > 1)
429 		return -EINVAL;
430 
431 	mutex_lock(&us_ibdev->usdev_lock);
432 	memset(&(gid->raw[0]), 0, sizeof(gid->raw));
433 	usnic_mac_ip_to_gid(us_ibdev->ufdev->mac, us_ibdev->ufdev->inaddr,
434 			&gid->raw[0]);
435 	mutex_unlock(&us_ibdev->usdev_lock);
436 
437 	return 0;
438 }
439 
440 int usnic_ib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
441 				u16 *pkey)
442 {
443 	if (index > 0)
444 		return -EINVAL;
445 
446 	*pkey = 0xffff;
447 	return 0;
448 }
449 
450 int usnic_ib_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
451 {
452 	struct usnic_ib_pd *pd = to_upd(ibpd);
453 	void *umem_pd;
454 
455 	umem_pd = pd->umem_pd = usnic_uiom_alloc_pd();
456 	if (IS_ERR_OR_NULL(umem_pd)) {
457 		return umem_pd ? PTR_ERR(umem_pd) : -ENOMEM;
458 	}
459 
460 	return 0;
461 }
462 
463 void usnic_ib_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata)
464 {
465 	usnic_uiom_dealloc_pd((to_upd(pd))->umem_pd);
466 }
467 
468 struct ib_qp *usnic_ib_create_qp(struct ib_pd *pd,
469 					struct ib_qp_init_attr *init_attr,
470 					struct ib_udata *udata)
471 {
472 	int err;
473 	struct usnic_ib_dev *us_ibdev;
474 	struct usnic_ib_qp_grp *qp_grp;
475 	struct usnic_ib_ucontext *ucontext = rdma_udata_to_drv_context(
476 		udata, struct usnic_ib_ucontext, ibucontext);
477 	int cq_cnt;
478 	struct usnic_vnic_res_spec res_spec;
479 	struct usnic_ib_create_qp_cmd cmd;
480 	struct usnic_transport_spec trans_spec;
481 
482 	usnic_dbg("\n");
483 
484 	us_ibdev = to_usdev(pd->device);
485 
486 	if (init_attr->create_flags)
487 		return ERR_PTR(-EINVAL);
488 
489 	err = ib_copy_from_udata(&cmd, udata, sizeof(cmd));
490 	if (err) {
491 		usnic_err("%s: cannot copy udata for create_qp\n",
492 			  dev_name(&us_ibdev->ib_dev.dev));
493 		return ERR_PTR(-EINVAL);
494 	}
495 
496 	err = create_qp_validate_user_data(cmd);
497 	if (err) {
498 		usnic_err("%s: Failed to validate user data\n",
499 			  dev_name(&us_ibdev->ib_dev.dev));
500 		return ERR_PTR(-EINVAL);
501 	}
502 
503 	if (init_attr->qp_type != IB_QPT_UD) {
504 		usnic_err("%s asked to make a non-UD QP: %d\n",
505 			  dev_name(&us_ibdev->ib_dev.dev), init_attr->qp_type);
506 		return ERR_PTR(-EOPNOTSUPP);
507 	}
508 
509 	trans_spec = cmd.spec;
510 	mutex_lock(&us_ibdev->usdev_lock);
511 	cq_cnt = (init_attr->send_cq == init_attr->recv_cq) ? 1 : 2;
512 	res_spec = min_transport_spec[trans_spec.trans_type];
513 	usnic_vnic_res_spec_update(&res_spec, USNIC_VNIC_RES_TYPE_CQ, cq_cnt);
514 	qp_grp = find_free_vf_and_create_qp_grp(us_ibdev, to_upd(pd),
515 						&trans_spec,
516 						&res_spec);
517 	if (IS_ERR_OR_NULL(qp_grp)) {
518 		err = qp_grp ? PTR_ERR(qp_grp) : -ENOMEM;
519 		goto out_release_mutex;
520 	}
521 
522 	err = usnic_ib_fill_create_qp_resp(qp_grp, udata);
523 	if (err) {
524 		err = -EBUSY;
525 		goto out_release_qp_grp;
526 	}
527 
528 	qp_grp->ctx = ucontext;
529 	list_add_tail(&qp_grp->link, &ucontext->qp_grp_list);
530 	usnic_ib_log_vf(qp_grp->vf);
531 	mutex_unlock(&us_ibdev->usdev_lock);
532 	return &qp_grp->ibqp;
533 
534 out_release_qp_grp:
535 	qp_grp_destroy(qp_grp);
536 out_release_mutex:
537 	mutex_unlock(&us_ibdev->usdev_lock);
538 	return ERR_PTR(err);
539 }
540 
541 int usnic_ib_destroy_qp(struct ib_qp *qp, struct ib_udata *udata)
542 {
543 	struct usnic_ib_qp_grp *qp_grp;
544 	struct usnic_ib_vf *vf;
545 
546 	usnic_dbg("\n");
547 
548 	qp_grp = to_uqp_grp(qp);
549 	vf = qp_grp->vf;
550 	mutex_lock(&vf->pf->usdev_lock);
551 	if (usnic_ib_qp_grp_modify(qp_grp, IB_QPS_RESET, NULL)) {
552 		usnic_err("Failed to move qp grp %u to reset\n",
553 				qp_grp->grp_id);
554 	}
555 
556 	list_del(&qp_grp->link);
557 	qp_grp_destroy(qp_grp);
558 	mutex_unlock(&vf->pf->usdev_lock);
559 
560 	return 0;
561 }
562 
563 int usnic_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
564 				int attr_mask, struct ib_udata *udata)
565 {
566 	struct usnic_ib_qp_grp *qp_grp;
567 	int status;
568 	usnic_dbg("\n");
569 
570 	qp_grp = to_uqp_grp(ibqp);
571 
572 	mutex_lock(&qp_grp->vf->pf->usdev_lock);
573 	if ((attr_mask & IB_QP_PORT) && attr->port_num != 1) {
574 		/* usnic devices only have one port */
575 		status = -EINVAL;
576 		goto out_unlock;
577 	}
578 	if (attr_mask & IB_QP_STATE) {
579 		status = usnic_ib_qp_grp_modify(qp_grp, attr->qp_state, NULL);
580 	} else {
581 		usnic_err("Unhandled request, attr_mask=0x%x\n", attr_mask);
582 		status = -EINVAL;
583 	}
584 
585 out_unlock:
586 	mutex_unlock(&qp_grp->vf->pf->usdev_lock);
587 	return status;
588 }
589 
590 int usnic_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
591 		       struct ib_udata *udata)
592 {
593 	if (attr->flags)
594 		return -EINVAL;
595 
596 	return 0;
597 }
598 
599 void usnic_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
600 {
601 	return;
602 }
603 
604 struct ib_mr *usnic_ib_reg_mr(struct ib_pd *pd, u64 start, u64 length,
605 					u64 virt_addr, int access_flags,
606 					struct ib_udata *udata)
607 {
608 	struct usnic_ib_mr *mr;
609 	int err;
610 
611 	usnic_dbg("start 0x%llx va 0x%llx length 0x%llx\n", start,
612 			virt_addr, length);
613 
614 	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
615 	if (!mr)
616 		return ERR_PTR(-ENOMEM);
617 
618 	mr->umem = usnic_uiom_reg_get(to_upd(pd)->umem_pd, start, length,
619 					access_flags, 0);
620 	if (IS_ERR_OR_NULL(mr->umem)) {
621 		err = mr->umem ? PTR_ERR(mr->umem) : -EFAULT;
622 		goto err_free;
623 	}
624 
625 	mr->ibmr.lkey = mr->ibmr.rkey = 0;
626 	return &mr->ibmr;
627 
628 err_free:
629 	kfree(mr);
630 	return ERR_PTR(err);
631 }
632 
633 int usnic_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
634 {
635 	struct usnic_ib_mr *mr = to_umr(ibmr);
636 
637 	usnic_dbg("va 0x%lx length 0x%zx\n", mr->umem->va, mr->umem->length);
638 
639 	usnic_uiom_reg_release(mr->umem);
640 	kfree(mr);
641 	return 0;
642 }
643 
644 int usnic_ib_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
645 {
646 	struct ib_device *ibdev = uctx->device;
647 	struct usnic_ib_ucontext *context = to_ucontext(uctx);
648 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
649 	usnic_dbg("\n");
650 
651 	INIT_LIST_HEAD(&context->qp_grp_list);
652 	mutex_lock(&us_ibdev->usdev_lock);
653 	list_add_tail(&context->link, &us_ibdev->ctx_list);
654 	mutex_unlock(&us_ibdev->usdev_lock);
655 
656 	return 0;
657 }
658 
659 void usnic_ib_dealloc_ucontext(struct ib_ucontext *ibcontext)
660 {
661 	struct usnic_ib_ucontext *context = to_uucontext(ibcontext);
662 	struct usnic_ib_dev *us_ibdev = to_usdev(ibcontext->device);
663 	usnic_dbg("\n");
664 
665 	mutex_lock(&us_ibdev->usdev_lock);
666 	WARN_ON_ONCE(!list_empty(&context->qp_grp_list));
667 	list_del(&context->link);
668 	mutex_unlock(&us_ibdev->usdev_lock);
669 }
670 
671 int usnic_ib_mmap(struct ib_ucontext *context,
672 				struct vm_area_struct *vma)
673 {
674 	struct usnic_ib_ucontext *uctx = to_ucontext(context);
675 	struct usnic_ib_dev *us_ibdev;
676 	struct usnic_ib_qp_grp *qp_grp;
677 	struct usnic_ib_vf *vf;
678 	struct vnic_dev_bar *bar;
679 	dma_addr_t bus_addr;
680 	unsigned int len;
681 	unsigned int vfid;
682 
683 	usnic_dbg("\n");
684 
685 	us_ibdev = to_usdev(context->device);
686 	vma->vm_flags |= VM_IO;
687 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
688 	vfid = vma->vm_pgoff;
689 	usnic_dbg("Page Offset %lu PAGE_SHIFT %u VFID %u\n",
690 			vma->vm_pgoff, PAGE_SHIFT, vfid);
691 
692 	mutex_lock(&us_ibdev->usdev_lock);
693 	list_for_each_entry(qp_grp, &uctx->qp_grp_list, link) {
694 		vf = qp_grp->vf;
695 		if (usnic_vnic_get_index(vf->vnic) == vfid) {
696 			bar = usnic_vnic_get_bar(vf->vnic, 0);
697 			if ((vma->vm_end - vma->vm_start) != bar->len) {
698 				usnic_err("Bar0 Len %lu - Request map %lu\n",
699 						bar->len,
700 						vma->vm_end - vma->vm_start);
701 				mutex_unlock(&us_ibdev->usdev_lock);
702 				return -EINVAL;
703 			}
704 			bus_addr = bar->bus_addr;
705 			len = bar->len;
706 			usnic_dbg("bus: %pa vaddr: %p size: %ld\n",
707 					&bus_addr, bar->vaddr, bar->len);
708 			mutex_unlock(&us_ibdev->usdev_lock);
709 
710 			return remap_pfn_range(vma,
711 						vma->vm_start,
712 						bus_addr >> PAGE_SHIFT,
713 						len, vma->vm_page_prot);
714 		}
715 	}
716 
717 	mutex_unlock(&us_ibdev->usdev_lock);
718 	usnic_err("No VF %u found\n", vfid);
719 	return -EINVAL;
720 }
721 
722