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 		dev_list = NULL;
218 	}
219 
220 	/* Try to find resources on an unused vf */
221 	list_for_each_entry(vf, &us_ibdev->vf_dev_list, link) {
222 		spin_lock(&vf->lock);
223 		vnic = vf->vnic;
224 		if (vf->qp_grp_ref_cnt == 0 &&
225 		    usnic_vnic_check_room(vnic, res_spec) == 0) {
226 			qp_grp = usnic_ib_qp_grp_create(us_ibdev->ufdev, vf,
227 							pd, res_spec,
228 							trans_spec);
229 
230 			spin_unlock(&vf->lock);
231 			goto qp_grp_check;
232 		}
233 		spin_unlock(&vf->lock);
234 	}
235 
236 	usnic_info("No free qp grp found on %s\n",
237 		   dev_name(&us_ibdev->ib_dev.dev));
238 	return ERR_PTR(-ENOMEM);
239 
240 qp_grp_check:
241 	if (IS_ERR_OR_NULL(qp_grp)) {
242 		usnic_err("Failed to allocate qp_grp\n");
243 		if (usnic_ib_share_vf)
244 			usnic_uiom_free_dev_list(dev_list);
245 		return ERR_PTR(qp_grp ? PTR_ERR(qp_grp) : -ENOMEM);
246 	}
247 	return qp_grp;
248 }
249 
250 static void qp_grp_destroy(struct usnic_ib_qp_grp *qp_grp)
251 {
252 	struct usnic_ib_vf *vf = qp_grp->vf;
253 
254 	WARN_ON(qp_grp->state != IB_QPS_RESET);
255 
256 	spin_lock(&vf->lock);
257 	usnic_ib_qp_grp_destroy(qp_grp);
258 	spin_unlock(&vf->lock);
259 }
260 
261 static int create_qp_validate_user_data(struct usnic_ib_create_qp_cmd cmd)
262 {
263 	if (cmd.spec.trans_type <= USNIC_TRANSPORT_UNKNOWN ||
264 			cmd.spec.trans_type >= USNIC_TRANSPORT_MAX)
265 		return -EINVAL;
266 
267 	return 0;
268 }
269 
270 /* Start of ib callback functions */
271 
272 enum rdma_link_layer usnic_ib_port_link_layer(struct ib_device *device,
273 					      u32 port_num)
274 {
275 	return IB_LINK_LAYER_ETHERNET;
276 }
277 
278 int usnic_ib_query_device(struct ib_device *ibdev,
279 			  struct ib_device_attr *props,
280 			  struct ib_udata *uhw)
281 {
282 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
283 	union ib_gid gid;
284 	struct ethtool_drvinfo info;
285 	int qp_per_vf;
286 
287 	usnic_dbg("\n");
288 	if (uhw->inlen || uhw->outlen)
289 		return -EINVAL;
290 
291 	mutex_lock(&us_ibdev->usdev_lock);
292 	us_ibdev->netdev->ethtool_ops->get_drvinfo(us_ibdev->netdev, &info);
293 	memset(props, 0, sizeof(*props));
294 	usnic_mac_ip_to_gid(us_ibdev->ufdev->mac, us_ibdev->ufdev->inaddr,
295 			&gid.raw[0]);
296 	memcpy(&props->sys_image_guid, &gid.global.interface_id,
297 		sizeof(gid.global.interface_id));
298 	usnic_ib_fw_string_to_u64(&info.fw_version[0], &props->fw_ver);
299 	props->max_mr_size = USNIC_UIOM_MAX_MR_SIZE;
300 	props->page_size_cap = USNIC_UIOM_PAGE_SIZE;
301 	props->vendor_id = PCI_VENDOR_ID_CISCO;
302 	props->vendor_part_id = PCI_DEVICE_ID_CISCO_VIC_USPACE_NIC;
303 	props->hw_ver = us_ibdev->pdev->subsystem_device;
304 	qp_per_vf = max(us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_WQ],
305 			us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_RQ]);
306 	props->max_qp = qp_per_vf *
307 		kref_read(&us_ibdev->vf_cnt);
308 	props->device_cap_flags = IB_DEVICE_PORT_ACTIVE_EVENT |
309 		IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_BLOCK_MULTICAST_LOOPBACK;
310 	props->max_cq = us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_CQ] *
311 		kref_read(&us_ibdev->vf_cnt);
312 	props->max_pd = USNIC_UIOM_MAX_PD_CNT;
313 	props->max_mr = USNIC_UIOM_MAX_MR_CNT;
314 	props->local_ca_ack_delay = 0;
315 	props->max_pkeys = 0;
316 	props->atomic_cap = IB_ATOMIC_NONE;
317 	props->masked_atomic_cap = props->atomic_cap;
318 	props->max_qp_rd_atom = 0;
319 	props->max_qp_init_rd_atom = 0;
320 	props->max_res_rd_atom = 0;
321 	props->max_srq = 0;
322 	props->max_srq_wr = 0;
323 	props->max_srq_sge = 0;
324 	props->max_fast_reg_page_list_len = 0;
325 	props->max_mcast_grp = 0;
326 	props->max_mcast_qp_attach = 0;
327 	props->max_total_mcast_qp_attach = 0;
328 	/* Owned by Userspace
329 	 * max_qp_wr, max_sge, max_sge_rd, max_cqe */
330 	mutex_unlock(&us_ibdev->usdev_lock);
331 
332 	return 0;
333 }
334 
335 int usnic_ib_query_port(struct ib_device *ibdev, u32 port,
336 				struct ib_port_attr *props)
337 {
338 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
339 
340 	usnic_dbg("\n");
341 
342 	if (ib_get_eth_speed(ibdev, port, &props->active_speed,
343 			     &props->active_width))
344 		return -EINVAL;
345 
346 	/*
347 	 * usdev_lock is acquired after (and not before) ib_get_eth_speed call
348 	 * because acquiring rtnl_lock in ib_get_eth_speed, while holding
349 	 * usdev_lock could lead to a deadlock.
350 	 */
351 	mutex_lock(&us_ibdev->usdev_lock);
352 	/* props being zeroed by the caller, avoid zeroing it here */
353 
354 	props->lid = 0;
355 	props->lmc = 1;
356 	props->sm_lid = 0;
357 	props->sm_sl = 0;
358 
359 	if (!us_ibdev->ufdev->link_up) {
360 		props->state = IB_PORT_DOWN;
361 		props->phys_state = IB_PORT_PHYS_STATE_DISABLED;
362 	} else if (!us_ibdev->ufdev->inaddr) {
363 		props->state = IB_PORT_INIT;
364 		props->phys_state =
365 			IB_PORT_PHYS_STATE_PORT_CONFIGURATION_TRAINING;
366 	} else {
367 		props->state = IB_PORT_ACTIVE;
368 		props->phys_state = IB_PORT_PHYS_STATE_LINK_UP;
369 	}
370 
371 	props->port_cap_flags = 0;
372 	props->gid_tbl_len = 1;
373 	props->bad_pkey_cntr = 0;
374 	props->qkey_viol_cntr = 0;
375 	props->max_mtu = IB_MTU_4096;
376 	props->active_mtu = iboe_get_mtu(us_ibdev->ufdev->mtu);
377 	/* Userspace will adjust for hdrs */
378 	props->max_msg_sz = us_ibdev->ufdev->mtu;
379 	props->max_vl_num = 1;
380 	mutex_unlock(&us_ibdev->usdev_lock);
381 
382 	return 0;
383 }
384 
385 int usnic_ib_query_qp(struct ib_qp *qp, struct ib_qp_attr *qp_attr,
386 				int qp_attr_mask,
387 				struct ib_qp_init_attr *qp_init_attr)
388 {
389 	struct usnic_ib_qp_grp *qp_grp;
390 	struct usnic_ib_vf *vf;
391 	int err;
392 
393 	usnic_dbg("\n");
394 
395 	memset(qp_attr, 0, sizeof(*qp_attr));
396 	memset(qp_init_attr, 0, sizeof(*qp_init_attr));
397 
398 	qp_grp = to_uqp_grp(qp);
399 	vf = qp_grp->vf;
400 	mutex_lock(&vf->pf->usdev_lock);
401 	usnic_dbg("\n");
402 	qp_attr->qp_state = qp_grp->state;
403 	qp_attr->cur_qp_state = qp_grp->state;
404 
405 	switch (qp_grp->ibqp.qp_type) {
406 	case IB_QPT_UD:
407 		qp_attr->qkey = 0;
408 		break;
409 	default:
410 		usnic_err("Unexpected qp_type %d\n", qp_grp->ibqp.qp_type);
411 		err = -EINVAL;
412 		goto err_out;
413 	}
414 
415 	mutex_unlock(&vf->pf->usdev_lock);
416 	return 0;
417 
418 err_out:
419 	mutex_unlock(&vf->pf->usdev_lock);
420 	return err;
421 }
422 
423 int usnic_ib_query_gid(struct ib_device *ibdev, u32 port, int index,
424 				union ib_gid *gid)
425 {
426 
427 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
428 	usnic_dbg("\n");
429 
430 	if (index > 1)
431 		return -EINVAL;
432 
433 	mutex_lock(&us_ibdev->usdev_lock);
434 	memset(&(gid->raw[0]), 0, sizeof(gid->raw));
435 	usnic_mac_ip_to_gid(us_ibdev->ufdev->mac, us_ibdev->ufdev->inaddr,
436 			&gid->raw[0]);
437 	mutex_unlock(&us_ibdev->usdev_lock);
438 
439 	return 0;
440 }
441 
442 int usnic_ib_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
443 {
444 	struct usnic_ib_pd *pd = to_upd(ibpd);
445 	void *umem_pd;
446 
447 	umem_pd = pd->umem_pd = usnic_uiom_alloc_pd();
448 	if (IS_ERR_OR_NULL(umem_pd)) {
449 		return umem_pd ? PTR_ERR(umem_pd) : -ENOMEM;
450 	}
451 
452 	return 0;
453 }
454 
455 int usnic_ib_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata)
456 {
457 	usnic_uiom_dealloc_pd((to_upd(pd))->umem_pd);
458 	return 0;
459 }
460 
461 struct ib_qp *usnic_ib_create_qp(struct ib_pd *pd,
462 					struct ib_qp_init_attr *init_attr,
463 					struct ib_udata *udata)
464 {
465 	int err;
466 	struct usnic_ib_dev *us_ibdev;
467 	struct usnic_ib_qp_grp *qp_grp;
468 	struct usnic_ib_ucontext *ucontext = rdma_udata_to_drv_context(
469 		udata, struct usnic_ib_ucontext, ibucontext);
470 	int cq_cnt;
471 	struct usnic_vnic_res_spec res_spec;
472 	struct usnic_ib_create_qp_cmd cmd;
473 	struct usnic_transport_spec trans_spec;
474 
475 	usnic_dbg("\n");
476 
477 	us_ibdev = to_usdev(pd->device);
478 
479 	if (init_attr->create_flags)
480 		return ERR_PTR(-EOPNOTSUPP);
481 
482 	err = ib_copy_from_udata(&cmd, udata, sizeof(cmd));
483 	if (err) {
484 		usnic_err("%s: cannot copy udata for create_qp\n",
485 			  dev_name(&us_ibdev->ib_dev.dev));
486 		return ERR_PTR(-EINVAL);
487 	}
488 
489 	err = create_qp_validate_user_data(cmd);
490 	if (err) {
491 		usnic_err("%s: Failed to validate user data\n",
492 			  dev_name(&us_ibdev->ib_dev.dev));
493 		return ERR_PTR(-EINVAL);
494 	}
495 
496 	if (init_attr->qp_type != IB_QPT_UD) {
497 		usnic_err("%s asked to make a non-UD QP: %d\n",
498 			  dev_name(&us_ibdev->ib_dev.dev), init_attr->qp_type);
499 		return ERR_PTR(-EOPNOTSUPP);
500 	}
501 
502 	trans_spec = cmd.spec;
503 	mutex_lock(&us_ibdev->usdev_lock);
504 	cq_cnt = (init_attr->send_cq == init_attr->recv_cq) ? 1 : 2;
505 	res_spec = min_transport_spec[trans_spec.trans_type];
506 	usnic_vnic_res_spec_update(&res_spec, USNIC_VNIC_RES_TYPE_CQ, cq_cnt);
507 	qp_grp = find_free_vf_and_create_qp_grp(us_ibdev, to_upd(pd),
508 						&trans_spec,
509 						&res_spec);
510 	if (IS_ERR_OR_NULL(qp_grp)) {
511 		err = qp_grp ? PTR_ERR(qp_grp) : -ENOMEM;
512 		goto out_release_mutex;
513 	}
514 
515 	err = usnic_ib_fill_create_qp_resp(qp_grp, udata);
516 	if (err) {
517 		err = -EBUSY;
518 		goto out_release_qp_grp;
519 	}
520 
521 	qp_grp->ctx = ucontext;
522 	list_add_tail(&qp_grp->link, &ucontext->qp_grp_list);
523 	usnic_ib_log_vf(qp_grp->vf);
524 	mutex_unlock(&us_ibdev->usdev_lock);
525 	return &qp_grp->ibqp;
526 
527 out_release_qp_grp:
528 	qp_grp_destroy(qp_grp);
529 out_release_mutex:
530 	mutex_unlock(&us_ibdev->usdev_lock);
531 	return ERR_PTR(err);
532 }
533 
534 int usnic_ib_destroy_qp(struct ib_qp *qp, struct ib_udata *udata)
535 {
536 	struct usnic_ib_qp_grp *qp_grp;
537 	struct usnic_ib_vf *vf;
538 
539 	usnic_dbg("\n");
540 
541 	qp_grp = to_uqp_grp(qp);
542 	vf = qp_grp->vf;
543 	mutex_lock(&vf->pf->usdev_lock);
544 	if (usnic_ib_qp_grp_modify(qp_grp, IB_QPS_RESET, NULL)) {
545 		usnic_err("Failed to move qp grp %u to reset\n",
546 				qp_grp->grp_id);
547 	}
548 
549 	list_del(&qp_grp->link);
550 	qp_grp_destroy(qp_grp);
551 	mutex_unlock(&vf->pf->usdev_lock);
552 
553 	return 0;
554 }
555 
556 int usnic_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
557 				int attr_mask, struct ib_udata *udata)
558 {
559 	struct usnic_ib_qp_grp *qp_grp;
560 	int status;
561 	usnic_dbg("\n");
562 
563 	if (attr_mask & ~IB_QP_ATTR_STANDARD_BITS)
564 		return -EOPNOTSUPP;
565 
566 	qp_grp = to_uqp_grp(ibqp);
567 
568 	mutex_lock(&qp_grp->vf->pf->usdev_lock);
569 	if ((attr_mask & IB_QP_PORT) && attr->port_num != 1) {
570 		/* usnic devices only have one port */
571 		status = -EINVAL;
572 		goto out_unlock;
573 	}
574 	if (attr_mask & IB_QP_STATE) {
575 		status = usnic_ib_qp_grp_modify(qp_grp, attr->qp_state, NULL);
576 	} else {
577 		usnic_err("Unhandled request, attr_mask=0x%x\n", attr_mask);
578 		status = -EINVAL;
579 	}
580 
581 out_unlock:
582 	mutex_unlock(&qp_grp->vf->pf->usdev_lock);
583 	return status;
584 }
585 
586 int usnic_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
587 		       struct ib_udata *udata)
588 {
589 	if (attr->flags)
590 		return -EOPNOTSUPP;
591 
592 	return 0;
593 }
594 
595 int usnic_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
596 {
597 	return 0;
598 }
599 
600 struct ib_mr *usnic_ib_reg_mr(struct ib_pd *pd, u64 start, u64 length,
601 					u64 virt_addr, int access_flags,
602 					struct ib_udata *udata)
603 {
604 	struct usnic_ib_mr *mr;
605 	int err;
606 
607 	usnic_dbg("start 0x%llx va 0x%llx length 0x%llx\n", start,
608 			virt_addr, length);
609 
610 	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
611 	if (!mr)
612 		return ERR_PTR(-ENOMEM);
613 
614 	mr->umem = usnic_uiom_reg_get(to_upd(pd)->umem_pd, start, length,
615 					access_flags, 0);
616 	if (IS_ERR_OR_NULL(mr->umem)) {
617 		err = mr->umem ? PTR_ERR(mr->umem) : -EFAULT;
618 		goto err_free;
619 	}
620 
621 	mr->ibmr.lkey = mr->ibmr.rkey = 0;
622 	return &mr->ibmr;
623 
624 err_free:
625 	kfree(mr);
626 	return ERR_PTR(err);
627 }
628 
629 int usnic_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
630 {
631 	struct usnic_ib_mr *mr = to_umr(ibmr);
632 
633 	usnic_dbg("va 0x%lx length 0x%zx\n", mr->umem->va, mr->umem->length);
634 
635 	usnic_uiom_reg_release(mr->umem);
636 	kfree(mr);
637 	return 0;
638 }
639 
640 int usnic_ib_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
641 {
642 	struct ib_device *ibdev = uctx->device;
643 	struct usnic_ib_ucontext *context = to_ucontext(uctx);
644 	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
645 	usnic_dbg("\n");
646 
647 	INIT_LIST_HEAD(&context->qp_grp_list);
648 	mutex_lock(&us_ibdev->usdev_lock);
649 	list_add_tail(&context->link, &us_ibdev->ctx_list);
650 	mutex_unlock(&us_ibdev->usdev_lock);
651 
652 	return 0;
653 }
654 
655 void usnic_ib_dealloc_ucontext(struct ib_ucontext *ibcontext)
656 {
657 	struct usnic_ib_ucontext *context = to_uucontext(ibcontext);
658 	struct usnic_ib_dev *us_ibdev = to_usdev(ibcontext->device);
659 	usnic_dbg("\n");
660 
661 	mutex_lock(&us_ibdev->usdev_lock);
662 	WARN_ON_ONCE(!list_empty(&context->qp_grp_list));
663 	list_del(&context->link);
664 	mutex_unlock(&us_ibdev->usdev_lock);
665 }
666 
667 int usnic_ib_mmap(struct ib_ucontext *context,
668 				struct vm_area_struct *vma)
669 {
670 	struct usnic_ib_ucontext *uctx = to_ucontext(context);
671 	struct usnic_ib_dev *us_ibdev;
672 	struct usnic_ib_qp_grp *qp_grp;
673 	struct usnic_ib_vf *vf;
674 	struct vnic_dev_bar *bar;
675 	dma_addr_t bus_addr;
676 	unsigned int len;
677 	unsigned int vfid;
678 
679 	usnic_dbg("\n");
680 
681 	us_ibdev = to_usdev(context->device);
682 	vma->vm_flags |= VM_IO;
683 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
684 	vfid = vma->vm_pgoff;
685 	usnic_dbg("Page Offset %lu PAGE_SHIFT %u VFID %u\n",
686 			vma->vm_pgoff, PAGE_SHIFT, vfid);
687 
688 	mutex_lock(&us_ibdev->usdev_lock);
689 	list_for_each_entry(qp_grp, &uctx->qp_grp_list, link) {
690 		vf = qp_grp->vf;
691 		if (usnic_vnic_get_index(vf->vnic) == vfid) {
692 			bar = usnic_vnic_get_bar(vf->vnic, 0);
693 			if ((vma->vm_end - vma->vm_start) != bar->len) {
694 				usnic_err("Bar0 Len %lu - Request map %lu\n",
695 						bar->len,
696 						vma->vm_end - vma->vm_start);
697 				mutex_unlock(&us_ibdev->usdev_lock);
698 				return -EINVAL;
699 			}
700 			bus_addr = bar->bus_addr;
701 			len = bar->len;
702 			usnic_dbg("bus: %pa vaddr: %p size: %ld\n",
703 					&bus_addr, bar->vaddr, bar->len);
704 			mutex_unlock(&us_ibdev->usdev_lock);
705 
706 			return remap_pfn_range(vma,
707 						vma->vm_start,
708 						bus_addr >> PAGE_SHIFT,
709 						len, vma->vm_page_prot);
710 		}
711 	}
712 
713 	mutex_unlock(&us_ibdev->usdev_lock);
714 	usnic_err("No VF %u found\n", vfid);
715 	return -EINVAL;
716 }
717 
718