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1 /*
2  * Copyright (c) 2005 Topspin Communications.  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  * OpenIB.org 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 #if HAVE_CONFIG_H
34 #  include <config.h>
35 #endif /* HAVE_CONFIG_H */
36
37 #include <stdlib.h>
38 #include <netinet/in.h>
39 #include <pthread.h>
40 #include <string.h>
41
42 #include "mthca.h"
43
44 struct mthca_ah_page {
45         struct mthca_ah_page *prev, *next;
46         struct mthca_buf      buf;
47         struct ibv_mr        *mr;
48         int                   use_cnt;
49         unsigned              free[0];
50 };
51
52 static struct mthca_ah_page *__add_page(struct mthca_pd *pd, int page_size, int per_page)
53 {
54         struct mthca_ah_page *page;
55         int i;
56
57         page = malloc(sizeof *page + per_page * sizeof (int));
58         if (!page)
59                 return NULL;
60
61         if (mthca_alloc_buf(&page->buf, page_size, page_size)) {
62                 free(page);
63                 return NULL;
64         }
65
66         page->mr = mthca_reg_mr(&pd->ibv_pd, page->buf.buf, page_size, 0);
67         if (!page->mr) {
68                 mthca_free_buf(&page->buf);
69                 free(page);
70                 return NULL;
71         }
72
73         page->mr->context = pd->ibv_pd.context;
74
75         page->use_cnt = 0;
76         for (i = 0; i < per_page; ++i)
77                 page->free[i] = ~0;
78
79         page->prev = NULL;
80         page->next = pd->ah_list;
81         pd->ah_list = page;
82         if (page->next)
83                 page->next->prev = page;
84
85         return page;
86 }
87
88 int mthca_alloc_av(struct mthca_pd *pd, struct ibv_ah_attr *attr,
89                    struct mthca_ah *ah)
90 {
91         if (mthca_is_memfree(pd->ibv_pd.context)) {
92                 ah->av = malloc(sizeof *ah->av);
93                 if (!ah->av)
94                         return -1;
95         } else {
96                 struct mthca_ah_page *page;
97                 int ps;
98                 int pp;
99                 int i, j;
100
101                 ps = to_mdev(pd->ibv_pd.context->device)->page_size;
102                 pp = ps / (sizeof *ah->av * 8 * sizeof (int));
103
104                 pthread_mutex_lock(&pd->ah_mutex);
105                 for (page = pd->ah_list; page; page = page->next)
106                         if (page->use_cnt < ps / sizeof *ah->av)
107                                 for (i = 0; i < pp; ++i)
108                                         if (page->free[i])
109                                                 goto found;
110
111                 page = __add_page(pd, ps, pp);
112                 if (!page) {
113                         pthread_mutex_unlock(&pd->ah_mutex);
114                         return -1;
115                 }
116
117         found:
118                 ++page->use_cnt;
119
120                 for (i = 0, j = -1; i < pp; ++i)
121                         if (page->free[i]) {
122                                 j = ffs(page->free[i]);
123                                 page->free[i] &= ~(1 << (j - 1));
124                                 ah->av = page->buf.buf +
125                                         (i * 8 * sizeof (int) + (j - 1)) * sizeof *ah->av;
126                                 break;
127                         }
128
129                 ah->key  = page->mr->lkey;
130                 ah->page = page;
131
132                 pthread_mutex_unlock(&pd->ah_mutex);
133         }
134
135         memset(ah->av, 0, sizeof *ah->av);
136
137         ah->av->port_pd = htonl(pd->pdn | (attr->port_num << 24));
138         ah->av->g_slid  = attr->src_path_bits;
139         ah->av->dlid    = htons(attr->dlid);
140         ah->av->msg_sr  = (3 << 4) | /* 2K message */
141                 attr->static_rate;
142         ah->av->sl_tclass_flowlabel = htonl(attr->sl << 28);
143         if (attr->is_global) {
144                 ah->av->g_slid |= 0x80;
145                 /* XXX get gid_table length */
146                 ah->av->gid_index = (attr->port_num - 1) * 32 +
147                         attr->grh.sgid_index;
148                 ah->av->hop_limit = attr->grh.hop_limit;
149                 ah->av->sl_tclass_flowlabel |=
150                         htonl((attr->grh.traffic_class << 20) |
151                                     attr->grh.flow_label);
152                 memcpy(ah->av->dgid, attr->grh.dgid.raw, 16);
153         } else {
154                 /* Arbel workaround -- low byte of GID must be 2 */
155                 ah->av->dgid[3] = htonl(2);
156         }
157
158         return 0;
159 }
160
161 void mthca_free_av(struct mthca_ah *ah)
162 {
163         if (mthca_is_memfree(ah->ibv_ah.context)) {
164                 free(ah->av);
165         } else {
166                 struct mthca_pd *pd = to_mpd(ah->ibv_ah.pd);
167                 struct mthca_ah_page *page;
168                 int i;
169
170                 pthread_mutex_lock(&pd->ah_mutex);
171
172                 page = ah->page;
173                 i = ((void *) ah->av - page->buf.buf) / sizeof *ah->av;
174                 page->free[i / (8 * sizeof (int))] |= 1 << (i % (8 * sizeof (int)));
175
176                 if (!--page->use_cnt) {
177                         if (page->prev)
178                                 page->prev->next = page->next;
179                         else
180                                 pd->ah_list = page->next;
181                         if (page->next)
182                                 page->next->prev = page->prev;
183
184                         mthca_dereg_mr(page->mr);
185                         mthca_free_buf(&page->buf);
186                         free(page);
187                 }
188
189                 pthread_mutex_unlock(&pd->ah_mutex);
190         }
191 }