1/*
2 * Copyright (c) 2016-2017 VMware, Inc.  All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of EITHER the GNU General Public License
6 * version 2 as published by the Free Software Foundation or the BSD
7 * 2-Clause License. This program is distributed in the hope that it
8 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
9 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
10 * See the GNU General Public License version 2 for more details at
11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program available in the file COPYING in the main
15 * directory of this source tree.
16 *
17 * The BSD 2-Clause License
18 *
19 *     Redistribution and use in source and binary forms, with or
20 *     without modification, are permitted provided that the following
21 *     conditions are met:
22 *
23 *      - Redistributions of source code must retain the above
24 *        copyright notice, this list of conditions and the following
25 *        disclaimer.
26 *
27 *      - Redistributions in binary form must reproduce the above
28 *        copyright notice, this list of conditions and the following
29 *        disclaimer in the documentation and/or other materials
30 *        provided with the distribution.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
36 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43 * OF THE POSSIBILITY OF SUCH DAMAGE.
44 */
45
46#include <asm/page.h>
47#include <linux/io.h>
48#include <linux/wait.h>
49#include <rdma/ib_addr.h>
50#include <rdma/ib_smi.h>
51#include <rdma/ib_user_verbs.h>
52
53#include "pvrdma.h"
54
55/**
56 * pvrdma_query_srq - query shared receive queue
57 * @ibsrq: the shared receive queue to query
58 * @srq_attr: attributes to query and return to client
59 *
60 * @return: 0 for success, otherwise returns an errno.
61 */
62int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
63{
64	struct pvrdma_dev *dev = to_vdev(ibsrq->device);
65	struct pvrdma_srq *srq = to_vsrq(ibsrq);
66	union pvrdma_cmd_req req;
67	union pvrdma_cmd_resp rsp;
68	struct pvrdma_cmd_query_srq *cmd = &req.query_srq;
69	struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp;
70	int ret;
71
72	memset(cmd, 0, sizeof(*cmd));
73	cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ;
74	cmd->srq_handle = srq->srq_handle;
75
76	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP);
77	if (ret < 0) {
78		dev_warn(&dev->pdev->dev,
79			 "could not query shared receive queue, error: %d\n",
80			 ret);
81		return -EINVAL;
82	}
83
84	srq_attr->srq_limit = resp->attrs.srq_limit;
85	srq_attr->max_wr = resp->attrs.max_wr;
86	srq_attr->max_sge = resp->attrs.max_sge;
87
88	return 0;
89}
90
91/**
92 * pvrdma_create_srq - create shared receive queue
93 * @ibsrq: the IB shared receive queue
94 * @init_attr: shared receive queue attributes
95 * @udata: user data
96 *
97 * @return: 0 on success, otherwise returns an errno.
98 */
99int pvrdma_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init_attr,
100		      struct ib_udata *udata)
101{
102	struct pvrdma_srq *srq = to_vsrq(ibsrq);
103	struct pvrdma_dev *dev = to_vdev(ibsrq->device);
104	union pvrdma_cmd_req req;
105	union pvrdma_cmd_resp rsp;
106	struct pvrdma_cmd_create_srq *cmd = &req.create_srq;
107	struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp;
108	struct pvrdma_create_srq_resp srq_resp = {};
109	struct pvrdma_create_srq ucmd;
110	unsigned long flags;
111	int ret;
112
113	if (!udata) {
114		/* No support for kernel clients. */
115		dev_warn(&dev->pdev->dev,
116			 "no shared receive queue support for kernel client\n");
117		return -EOPNOTSUPP;
118	}
119
120	if (init_attr->srq_type != IB_SRQT_BASIC) {
121		dev_warn(&dev->pdev->dev,
122			 "shared receive queue type %d not supported\n",
123			 init_attr->srq_type);
124		return -EOPNOTSUPP;
125	}
126
127	if (init_attr->attr.max_wr  > dev->dsr->caps.max_srq_wr ||
128	    init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) {
129		dev_warn(&dev->pdev->dev,
130			 "shared receive queue size invalid\n");
131		return -EINVAL;
132	}
133
134	if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
135		return -ENOMEM;
136
137	spin_lock_init(&srq->lock);
138	refcount_set(&srq->refcnt, 1);
139	init_completion(&srq->free);
140
141	dev_dbg(&dev->pdev->dev,
142		"create shared receive queue from user space\n");
143
144	if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
145		ret = -EFAULT;
146		goto err_srq;
147	}
148
149	srq->umem = ib_umem_get(ibsrq->device, ucmd.buf_addr, ucmd.buf_size, 0);
150	if (IS_ERR(srq->umem)) {
151		ret = PTR_ERR(srq->umem);
152		goto err_srq;
153	}
154
155	srq->npages = ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE);
156
157	if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
158		dev_warn(&dev->pdev->dev,
159			 "overflow pages in shared receive queue\n");
160		ret = -EINVAL;
161		goto err_umem;
162	}
163
164	ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false);
165	if (ret) {
166		dev_warn(&dev->pdev->dev,
167			 "could not allocate page directory\n");
168		goto err_umem;
169	}
170
171	pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
172
173	memset(cmd, 0, sizeof(*cmd));
174	cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ;
175	cmd->srq_type = init_attr->srq_type;
176	cmd->nchunks = srq->npages;
177	cmd->pd_handle = to_vpd(ibsrq->pd)->pd_handle;
178	cmd->attrs.max_wr = init_attr->attr.max_wr;
179	cmd->attrs.max_sge = init_attr->attr.max_sge;
180	cmd->attrs.srq_limit = init_attr->attr.srq_limit;
181	cmd->pdir_dma = srq->pdir.dir_dma;
182
183	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP);
184	if (ret < 0) {
185		dev_warn(&dev->pdev->dev,
186			 "could not create shared receive queue, error: %d\n",
187			 ret);
188		goto err_page_dir;
189	}
190
191	srq->srq_handle = resp->srqn;
192	srq_resp.srqn = resp->srqn;
193	spin_lock_irqsave(&dev->srq_tbl_lock, flags);
194	dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq;
195	spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
196
197	/* Copy udata back. */
198	if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) {
199		dev_warn(&dev->pdev->dev, "failed to copy back udata\n");
200		pvrdma_destroy_srq(&srq->ibsrq, udata);
201		return -EINVAL;
202	}
203
204	return 0;
205
206err_page_dir:
207	pvrdma_page_dir_cleanup(dev, &srq->pdir);
208err_umem:
209	ib_umem_release(srq->umem);
210err_srq:
211	atomic_dec(&dev->num_srqs);
212
213	return ret;
214}
215
216static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq)
217{
218	unsigned long flags;
219
220	spin_lock_irqsave(&dev->srq_tbl_lock, flags);
221	dev->srq_tbl[srq->srq_handle] = NULL;
222	spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
223
224	if (refcount_dec_and_test(&srq->refcnt))
225		complete(&srq->free);
226	wait_for_completion(&srq->free);
227
228	/* There is no support for kernel clients, so this is safe. */
229	ib_umem_release(srq->umem);
230
231	pvrdma_page_dir_cleanup(dev, &srq->pdir);
232
233	atomic_dec(&dev->num_srqs);
234}
235
236/**
237 * pvrdma_destroy_srq - destroy shared receive queue
238 * @srq: the shared receive queue to destroy
239 * @udata: user data or null for kernel object
240 *
241 * @return: 0 for success.
242 */
243int pvrdma_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
244{
245	struct pvrdma_srq *vsrq = to_vsrq(srq);
246	union pvrdma_cmd_req req;
247	struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
248	struct pvrdma_dev *dev = to_vdev(srq->device);
249	int ret;
250
251	memset(cmd, 0, sizeof(*cmd));
252	cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
253	cmd->srq_handle = vsrq->srq_handle;
254
255	ret = pvrdma_cmd_post(dev, &req, NULL, 0);
256	if (ret < 0)
257		dev_warn(&dev->pdev->dev,
258			 "destroy shared receive queue failed, error: %d\n",
259			 ret);
260
261	pvrdma_free_srq(dev, vsrq);
262	return 0;
263}
264
265/**
266 * pvrdma_modify_srq - modify shared receive queue attributes
267 * @ibsrq: the shared receive queue to modify
268 * @attr: the shared receive queue's new attributes
269 * @attr_mask: attributes mask
270 * @udata: user data
271 *
272 * @returns 0 on success, otherwise returns an errno.
273 */
274int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
275		      enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
276{
277	struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
278	union pvrdma_cmd_req req;
279	struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
280	struct pvrdma_dev *dev = to_vdev(ibsrq->device);
281	int ret;
282
283	/* Only support SRQ limit. */
284	if (!(attr_mask & IB_SRQ_LIMIT))
285		return -EINVAL;
286
287	memset(cmd, 0, sizeof(*cmd));
288	cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
289	cmd->srq_handle = vsrq->srq_handle;
290	cmd->attrs.srq_limit = attr->srq_limit;
291	cmd->attr_mask = attr_mask;
292
293	ret = pvrdma_cmd_post(dev, &req, NULL, 0);
294	if (ret < 0) {
295		dev_warn(&dev->pdev->dev,
296			 "could not modify shared receive queue, error: %d\n",
297			 ret);
298
299		return -EINVAL;
300	}
301
302	return ret;
303}
304