include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6.git] / drivers / infiniband / hw / ehca / ehca_av.c
1 /*
2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
3  *
4  *  address vector functions
5  *
6  *  Authors: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
7  *           Khadija Souissi <souissik@de.ibm.com>
8  *           Reinhard Ernst <rernst@de.ibm.com>
9  *           Christoph Raisch <raisch@de.ibm.com>
10  *
11  *  Copyright (c) 2005 IBM Corporation
12  *
13  *  All rights reserved.
14  *
15  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
16  *  BSD.
17  *
18  * OpenIB BSD License
19  *
20  * Redistribution and use in source and binary forms, with or without
21  * modification, are permitted provided that the following conditions are met:
22  *
23  * Redistributions of source code must retain the above copyright notice, this
24  * list of conditions and the following disclaimer.
25  *
26  * Redistributions in binary form must reproduce the above copyright notice,
27  * this list of conditions and the following disclaimer in the documentation
28  * and/or other materials
29  * provided with the distribution.
30  *
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
32  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
35  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
38  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
39  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGE.
42  */
43
44 #include <linux/slab.h>
45
46 #include "ehca_tools.h"
47 #include "ehca_iverbs.h"
48 #include "hcp_if.h"
49
50 static struct kmem_cache *av_cache;
51
52 int ehca_calc_ipd(struct ehca_shca *shca, int port,
53                   enum ib_rate path_rate, u32 *ipd)
54 {
55         int path = ib_rate_to_mult(path_rate);
56         int link, ret;
57         struct ib_port_attr pa;
58
59         if (path_rate == IB_RATE_PORT_CURRENT) {
60                 *ipd = 0;
61                 return 0;
62         }
63
64         if (unlikely(path < 0)) {
65                 ehca_err(&shca->ib_device, "Invalid static rate! path_rate=%x",
66                          path_rate);
67                 return -EINVAL;
68         }
69
70         ret = ehca_query_port(&shca->ib_device, port, &pa);
71         if (unlikely(ret < 0)) {
72                 ehca_err(&shca->ib_device, "Failed to query port  ret=%i", ret);
73                 return ret;
74         }
75
76         link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
77
78         if (path >= link)
79                 /* no need to throttle if path faster than link */
80                 *ipd = 0;
81         else
82                 /* IPD = round((link / path) - 1) */
83                 *ipd = ((link + (path >> 1)) / path) - 1;
84
85         return 0;
86 }
87
88 struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
89 {
90         int ret;
91         struct ehca_av *av;
92         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
93                                               ib_device);
94
95         av = kmem_cache_alloc(av_cache, GFP_KERNEL);
96         if (!av) {
97                 ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
98                          pd, ah_attr);
99                 return ERR_PTR(-ENOMEM);
100         }
101
102         av->av.sl = ah_attr->sl;
103         av->av.dlid = ah_attr->dlid;
104         av->av.slid_path_bits = ah_attr->src_path_bits;
105
106         if (ehca_static_rate < 0) {
107                 u32 ipd;
108                 if (ehca_calc_ipd(shca, ah_attr->port_num,
109                                   ah_attr->static_rate, &ipd)) {
110                         ret = -EINVAL;
111                         goto create_ah_exit1;
112                 }
113                 av->av.ipd = ipd;
114         } else
115                 av->av.ipd = ehca_static_rate;
116
117         av->av.lnh = ah_attr->ah_flags;
118         av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
119         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
120                                             ah_attr->grh.traffic_class);
121         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
122                                             ah_attr->grh.flow_label);
123         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
124                                             ah_attr->grh.hop_limit);
125         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
126         /* set sgid in grh.word_1 */
127         if (ah_attr->ah_flags & IB_AH_GRH) {
128                 int rc;
129                 struct ib_port_attr port_attr;
130                 union ib_gid gid;
131                 memset(&port_attr, 0, sizeof(port_attr));
132                 rc = ehca_query_port(pd->device, ah_attr->port_num,
133                                      &port_attr);
134                 if (rc) { /* invalid port number */
135                         ret = -EINVAL;
136                         ehca_err(pd->device, "Invalid port number "
137                                  "ehca_query_port() returned %x "
138                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
139                         goto create_ah_exit1;
140                 }
141                 memset(&gid, 0, sizeof(gid));
142                 rc = ehca_query_gid(pd->device,
143                                     ah_attr->port_num,
144                                     ah_attr->grh.sgid_index, &gid);
145                 if (rc) {
146                         ret = -EINVAL;
147                         ehca_err(pd->device, "Failed to retrieve sgid "
148                                  "ehca_query_gid() returned %x "
149                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
150                         goto create_ah_exit1;
151                 }
152                 memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
153         }
154         av->av.pmtu = shca->max_mtu;
155
156         /* dgid comes in grh.word_3 */
157         memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
158                sizeof(ah_attr->grh.dgid));
159
160         return &av->ib_ah;
161
162 create_ah_exit1:
163         kmem_cache_free(av_cache, av);
164
165         return ERR_PTR(ret);
166 }
167
168 int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
169 {
170         struct ehca_av *av;
171         struct ehca_ud_av new_ehca_av;
172         struct ehca_shca *shca = container_of(ah->pd->device, struct ehca_shca,
173                                               ib_device);
174
175         memset(&new_ehca_av, 0, sizeof(new_ehca_av));
176         new_ehca_av.sl = ah_attr->sl;
177         new_ehca_av.dlid = ah_attr->dlid;
178         new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
179         new_ehca_av.ipd = ah_attr->static_rate;
180         new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
181                                          (ah_attr->ah_flags & IB_AH_GRH) > 0);
182         new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
183                                                 ah_attr->grh.traffic_class);
184         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
185                                                  ah_attr->grh.flow_label);
186         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
187                                                  ah_attr->grh.hop_limit);
188         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);
189
190         /* set sgid in grh.word_1 */
191         if (ah_attr->ah_flags & IB_AH_GRH) {
192                 int rc;
193                 struct ib_port_attr port_attr;
194                 union ib_gid gid;
195                 memset(&port_attr, 0, sizeof(port_attr));
196                 rc = ehca_query_port(ah->device, ah_attr->port_num,
197                                      &port_attr);
198                 if (rc) { /* invalid port number */
199                         ehca_err(ah->device, "Invalid port number "
200                                  "ehca_query_port() returned %x "
201                                  "ah=%p ah_attr=%p port_num=%x",
202                                  rc, ah, ah_attr, ah_attr->port_num);
203                         return -EINVAL;
204                 }
205                 memset(&gid, 0, sizeof(gid));
206                 rc = ehca_query_gid(ah->device,
207                                     ah_attr->port_num,
208                                     ah_attr->grh.sgid_index, &gid);
209                 if (rc) {
210                         ehca_err(ah->device, "Failed to retrieve sgid "
211                                  "ehca_query_gid() returned %x "
212                                  "ah=%p ah_attr=%p port_num=%x "
213                                  "sgid_index=%x",
214                                  rc, ah, ah_attr, ah_attr->port_num,
215                                  ah_attr->grh.sgid_index);
216                         return -EINVAL;
217                 }
218                 memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
219         }
220
221         new_ehca_av.pmtu = shca->max_mtu;
222
223         memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
224                sizeof(ah_attr->grh.dgid));
225
226         av = container_of(ah, struct ehca_av, ib_ah);
227         av->av = new_ehca_av;
228
229         return 0;
230 }
231
232 int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
233 {
234         struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);
235
236         memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
237                sizeof(ah_attr->grh.dgid));
238         ah_attr->sl = av->av.sl;
239
240         ah_attr->dlid = av->av.dlid;
241
242         ah_attr->src_path_bits = av->av.slid_path_bits;
243         ah_attr->static_rate = av->av.ipd;
244         ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
245         ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
246                                                     av->av.grh.word_0);
247         ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
248                                                 av->av.grh.word_0);
249         ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
250                                                  av->av.grh.word_0);
251
252         return 0;
253 }
254
255 int ehca_destroy_ah(struct ib_ah *ah)
256 {
257         kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));
258
259         return 0;
260 }
261
262 int ehca_init_av_cache(void)
263 {
264         av_cache = kmem_cache_create("ehca_cache_av",
265                                    sizeof(struct ehca_av), 0,
266                                    SLAB_HWCACHE_ALIGN,
267                                    NULL);
268         if (!av_cache)
269                 return -ENOMEM;
270         return 0;
271 }
272
273 void ehca_cleanup_av_cache(void)
274 {
275         if (av_cache)
276                 kmem_cache_destroy(av_cache);
277 }