1 /*
2  * Copyright (c) 2012-2016 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 <linux/errno.h>
47 #include <linux/slab.h>
48 #include <linux/bitmap.h>
49 
50 #include "pvrdma.h"
51 
52 int pvrdma_page_dir_init(struct pvrdma_dev *dev, struct pvrdma_page_dir *pdir,
53 			 u64 npages, bool alloc_pages)
54 {
55 	u64 i;
56 
57 	if (npages > PVRDMA_PAGE_DIR_MAX_PAGES)
58 		return -EINVAL;
59 
60 	memset(pdir, 0, sizeof(*pdir));
61 
62 	pdir->dir = dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
63 				       &pdir->dir_dma, GFP_KERNEL);
64 	if (!pdir->dir)
65 		goto err;
66 
67 	pdir->ntables = PVRDMA_PAGE_DIR_TABLE(npages - 1) + 1;
68 	pdir->tables = kcalloc(pdir->ntables, sizeof(*pdir->tables),
69 			       GFP_KERNEL);
70 	if (!pdir->tables)
71 		goto err;
72 
73 	for (i = 0; i < pdir->ntables; i++) {
74 		pdir->tables[i] = dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
75 						(dma_addr_t *)&pdir->dir[i],
76 						GFP_KERNEL);
77 		if (!pdir->tables[i])
78 			goto err;
79 	}
80 
81 	pdir->npages = npages;
82 
83 	if (alloc_pages) {
84 		pdir->pages = kcalloc(npages, sizeof(*pdir->pages),
85 				      GFP_KERNEL);
86 		if (!pdir->pages)
87 			goto err;
88 
89 		for (i = 0; i < pdir->npages; i++) {
90 			dma_addr_t page_dma;
91 
92 			pdir->pages[i] = dma_alloc_coherent(&dev->pdev->dev,
93 							    PAGE_SIZE,
94 							    &page_dma,
95 							    GFP_KERNEL);
96 			if (!pdir->pages[i])
97 				goto err;
98 
99 			pvrdma_page_dir_insert_dma(pdir, i, page_dma);
100 		}
101 	}
102 
103 	return 0;
104 
105 err:
106 	pvrdma_page_dir_cleanup(dev, pdir);
107 
108 	return -ENOMEM;
109 }
110 
111 static u64 *pvrdma_page_dir_table(struct pvrdma_page_dir *pdir, u64 idx)
112 {
113 	return pdir->tables[PVRDMA_PAGE_DIR_TABLE(idx)];
114 }
115 
116 dma_addr_t pvrdma_page_dir_get_dma(struct pvrdma_page_dir *pdir, u64 idx)
117 {
118 	return pvrdma_page_dir_table(pdir, idx)[PVRDMA_PAGE_DIR_PAGE(idx)];
119 }
120 
121 static void pvrdma_page_dir_cleanup_pages(struct pvrdma_dev *dev,
122 					  struct pvrdma_page_dir *pdir)
123 {
124 	if (pdir->pages) {
125 		u64 i;
126 
127 		for (i = 0; i < pdir->npages && pdir->pages[i]; i++) {
128 			dma_addr_t page_dma = pvrdma_page_dir_get_dma(pdir, i);
129 
130 			dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
131 					  pdir->pages[i], page_dma);
132 		}
133 
134 		kfree(pdir->pages);
135 	}
136 }
137 
138 static void pvrdma_page_dir_cleanup_tables(struct pvrdma_dev *dev,
139 					   struct pvrdma_page_dir *pdir)
140 {
141 	if (pdir->tables) {
142 		int i;
143 
144 		pvrdma_page_dir_cleanup_pages(dev, pdir);
145 
146 		for (i = 0; i < pdir->ntables; i++) {
147 			u64 *table = pdir->tables[i];
148 
149 			if (table)
150 				dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
151 						  table, pdir->dir[i]);
152 		}
153 
154 		kfree(pdir->tables);
155 	}
156 }
157 
158 void pvrdma_page_dir_cleanup(struct pvrdma_dev *dev,
159 			     struct pvrdma_page_dir *pdir)
160 {
161 	if (pdir->dir) {
162 		pvrdma_page_dir_cleanup_tables(dev, pdir);
163 		dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
164 				  pdir->dir, pdir->dir_dma);
165 	}
166 }
167 
168 int pvrdma_page_dir_insert_dma(struct pvrdma_page_dir *pdir, u64 idx,
169 			       dma_addr_t daddr)
170 {
171 	u64 *table;
172 
173 	if (idx >= pdir->npages)
174 		return -EINVAL;
175 
176 	table = pvrdma_page_dir_table(pdir, idx);
177 	table[PVRDMA_PAGE_DIR_PAGE(idx)] = daddr;
178 
179 	return 0;
180 }
181 
182 int pvrdma_page_dir_insert_umem(struct pvrdma_page_dir *pdir,
183 				struct ib_umem *umem, u64 offset)
184 {
185 	u64 i = offset;
186 	int j, entry;
187 	int ret = 0, len = 0;
188 	struct scatterlist *sg;
189 
190 	if (offset >= pdir->npages)
191 		return -EINVAL;
192 
193 	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
194 		len = sg_dma_len(sg) >> PAGE_SHIFT;
195 		for (j = 0; j < len; j++) {
196 			dma_addr_t addr = sg_dma_address(sg) +
197 					  (j << umem->page_shift);
198 
199 			ret = pvrdma_page_dir_insert_dma(pdir, i, addr);
200 			if (ret)
201 				goto exit;
202 
203 			i++;
204 		}
205 	}
206 
207 exit:
208 	return ret;
209 }
210 
211 int pvrdma_page_dir_insert_page_list(struct pvrdma_page_dir *pdir,
212 				     u64 *page_list,
213 				     int num_pages)
214 {
215 	int i;
216 	int ret;
217 
218 	if (num_pages > pdir->npages)
219 		return -EINVAL;
220 
221 	for (i = 0; i < num_pages; i++) {
222 		ret = pvrdma_page_dir_insert_dma(pdir, i, page_list[i]);
223 		if (ret)
224 			return ret;
225 	}
226 
227 	return 0;
228 }
229 
230 void pvrdma_qp_cap_to_ib(struct ib_qp_cap *dst, const struct pvrdma_qp_cap *src)
231 {
232 	dst->max_send_wr = src->max_send_wr;
233 	dst->max_recv_wr = src->max_recv_wr;
234 	dst->max_send_sge = src->max_send_sge;
235 	dst->max_recv_sge = src->max_recv_sge;
236 	dst->max_inline_data = src->max_inline_data;
237 }
238 
239 void ib_qp_cap_to_pvrdma(struct pvrdma_qp_cap *dst, const struct ib_qp_cap *src)
240 {
241 	dst->max_send_wr = src->max_send_wr;
242 	dst->max_recv_wr = src->max_recv_wr;
243 	dst->max_send_sge = src->max_send_sge;
244 	dst->max_recv_sge = src->max_recv_sge;
245 	dst->max_inline_data = src->max_inline_data;
246 }
247 
248 void pvrdma_gid_to_ib(union ib_gid *dst, const union pvrdma_gid *src)
249 {
250 	BUILD_BUG_ON(sizeof(union pvrdma_gid) != sizeof(union ib_gid));
251 	memcpy(dst, src, sizeof(*src));
252 }
253 
254 void ib_gid_to_pvrdma(union pvrdma_gid *dst, const union ib_gid *src)
255 {
256 	BUILD_BUG_ON(sizeof(union pvrdma_gid) != sizeof(union ib_gid));
257 	memcpy(dst, src, sizeof(*src));
258 }
259 
260 void pvrdma_global_route_to_ib(struct ib_global_route *dst,
261 			       const struct pvrdma_global_route *src)
262 {
263 	pvrdma_gid_to_ib(&dst->dgid, &src->dgid);
264 	dst->flow_label = src->flow_label;
265 	dst->sgid_index = src->sgid_index;
266 	dst->hop_limit = src->hop_limit;
267 	dst->traffic_class = src->traffic_class;
268 }
269 
270 void ib_global_route_to_pvrdma(struct pvrdma_global_route *dst,
271 			       const struct ib_global_route *src)
272 {
273 	ib_gid_to_pvrdma(&dst->dgid, &src->dgid);
274 	dst->flow_label = src->flow_label;
275 	dst->sgid_index = src->sgid_index;
276 	dst->hop_limit = src->hop_limit;
277 	dst->traffic_class = src->traffic_class;
278 }
279 
280 void pvrdma_ah_attr_to_rdma(struct rdma_ah_attr *dst,
281 			    const struct pvrdma_ah_attr *src)
282 {
283 	dst->type = RDMA_AH_ATTR_TYPE_ROCE;
284 	pvrdma_global_route_to_ib(rdma_ah_retrieve_grh(dst), &src->grh);
285 	rdma_ah_set_dlid(dst, src->dlid);
286 	rdma_ah_set_sl(dst, src->sl);
287 	rdma_ah_set_path_bits(dst, src->src_path_bits);
288 	rdma_ah_set_static_rate(dst, src->static_rate);
289 	rdma_ah_set_ah_flags(dst, src->ah_flags);
290 	rdma_ah_set_port_num(dst, src->port_num);
291 	memcpy(dst->roce.dmac, &src->dmac, ETH_ALEN);
292 }
293 
294 void rdma_ah_attr_to_pvrdma(struct pvrdma_ah_attr *dst,
295 			    const struct rdma_ah_attr *src)
296 {
297 	ib_global_route_to_pvrdma(&dst->grh, rdma_ah_read_grh(src));
298 	dst->dlid = rdma_ah_get_dlid(src);
299 	dst->sl = rdma_ah_get_sl(src);
300 	dst->src_path_bits = rdma_ah_get_path_bits(src);
301 	dst->static_rate = rdma_ah_get_static_rate(src);
302 	dst->ah_flags = rdma_ah_get_ah_flags(src);
303 	dst->port_num = rdma_ah_get_port_num(src);
304 	memcpy(&dst->dmac, src->roce.dmac, sizeof(dst->dmac));
305 }
306 
307 u8 ib_gid_type_to_pvrdma(enum ib_gid_type gid_type)
308 {
309 	return (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ?
310 		PVRDMA_GID_TYPE_FLAG_ROCE_V2 :
311 		PVRDMA_GID_TYPE_FLAG_ROCE_V1;
312 }
313