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 "ehca_tools.h"
45 #include "ehca_iverbs.h"
46 #include "hcp_if.h"
47
48 static struct kmem_cache *av_cache;
49
ehca_calc_ipd(struct ehca_shca * shca,int port,enum ib_rate path_rate,u32 * ipd)50 int ehca_calc_ipd(struct ehca_shca *shca, int port,
51 enum ib_rate path_rate, u32 *ipd)
52 {
53 int path = ib_rate_to_mult(path_rate);
54 int link, ret;
55 struct ib_port_attr pa;
56
57 if (path_rate == IB_RATE_PORT_CURRENT) {
58 *ipd = 0;
59 return 0;
60 }
61
62 if (unlikely(path < 0)) {
63 ehca_err(&shca->ib_device, "Invalid static rate! path_rate=%x",
64 path_rate);
65 return -EINVAL;
66 }
67
68 ret = ehca_query_port(&shca->ib_device, port, &pa);
69 if (unlikely(ret < 0)) {
70 ehca_err(&shca->ib_device, "Failed to query port ret=%i", ret);
71 return ret;
72 }
73
74 link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
75
76 if (path >= link)
77 /* no need to throttle if path faster than link */
78 *ipd = 0;
79 else
80 /* IPD = round((link / path) - 1) */
81 *ipd = ((link + (path >> 1)) / path) - 1;
82
83 return 0;
84 }
85
ehca_create_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr)86 struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
87 {
88 int ret;
89 struct ehca_av *av;
90 struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
91 ib_device);
92
93 av = kmem_cache_alloc(av_cache, GFP_KERNEL);
94 if (!av) {
95 ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
96 pd, ah_attr);
97 return ERR_PTR(-ENOMEM);
98 }
99
100 av->av.sl = ah_attr->sl;
101 av->av.dlid = ah_attr->dlid;
102 av->av.slid_path_bits = ah_attr->src_path_bits;
103
104 if (ehca_static_rate < 0) {
105 u32 ipd;
106 if (ehca_calc_ipd(shca, ah_attr->port_num,
107 ah_attr->static_rate, &ipd)) {
108 ret = -EINVAL;
109 goto create_ah_exit1;
110 }
111 av->av.ipd = ipd;
112 } else
113 av->av.ipd = ehca_static_rate;
114
115 av->av.lnh = ah_attr->ah_flags;
116 av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
117 av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
118 ah_attr->grh.traffic_class);
119 av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
120 ah_attr->grh.flow_label);
121 av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
122 ah_attr->grh.hop_limit);
123 av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
124 /* set sgid in grh.word_1 */
125 if (ah_attr->ah_flags & IB_AH_GRH) {
126 int rc;
127 struct ib_port_attr port_attr;
128 union ib_gid gid;
129 memset(&port_attr, 0, sizeof(port_attr));
130 rc = ehca_query_port(pd->device, ah_attr->port_num,
131 &port_attr);
132 if (rc) { /* invalid port number */
133 ret = -EINVAL;
134 ehca_err(pd->device, "Invalid port number "
135 "ehca_query_port() returned %x "
136 "pd=%p ah_attr=%p", rc, pd, ah_attr);
137 goto create_ah_exit1;
138 }
139 memset(&gid, 0, sizeof(gid));
140 rc = ehca_query_gid(pd->device,
141 ah_attr->port_num,
142 ah_attr->grh.sgid_index, &gid);
143 if (rc) {
144 ret = -EINVAL;
145 ehca_err(pd->device, "Failed to retrieve sgid "
146 "ehca_query_gid() returned %x "
147 "pd=%p ah_attr=%p", rc, pd, ah_attr);
148 goto create_ah_exit1;
149 }
150 memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
151 }
152 av->av.pmtu = shca->max_mtu;
153
154 /* dgid comes in grh.word_3 */
155 memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
156 sizeof(ah_attr->grh.dgid));
157
158 return &av->ib_ah;
159
160 create_ah_exit1:
161 kmem_cache_free(av_cache, av);
162
163 return ERR_PTR(ret);
164 }
165
ehca_modify_ah(struct ib_ah * ah,struct ib_ah_attr * ah_attr)166 int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
167 {
168 struct ehca_av *av;
169 struct ehca_ud_av new_ehca_av;
170 struct ehca_shca *shca = container_of(ah->pd->device, struct ehca_shca,
171 ib_device);
172
173 memset(&new_ehca_av, 0, sizeof(new_ehca_av));
174 new_ehca_av.sl = ah_attr->sl;
175 new_ehca_av.dlid = ah_attr->dlid;
176 new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
177 new_ehca_av.ipd = ah_attr->static_rate;
178 new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
179 (ah_attr->ah_flags & IB_AH_GRH) > 0);
180 new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
181 ah_attr->grh.traffic_class);
182 new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
183 ah_attr->grh.flow_label);
184 new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
185 ah_attr->grh.hop_limit);
186 new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);
187
188 /* set sgid in grh.word_1 */
189 if (ah_attr->ah_flags & IB_AH_GRH) {
190 int rc;
191 struct ib_port_attr port_attr;
192 union ib_gid gid;
193 memset(&port_attr, 0, sizeof(port_attr));
194 rc = ehca_query_port(ah->device, ah_attr->port_num,
195 &port_attr);
196 if (rc) { /* invalid port number */
197 ehca_err(ah->device, "Invalid port number "
198 "ehca_query_port() returned %x "
199 "ah=%p ah_attr=%p port_num=%x",
200 rc, ah, ah_attr, ah_attr->port_num);
201 return -EINVAL;
202 }
203 memset(&gid, 0, sizeof(gid));
204 rc = ehca_query_gid(ah->device,
205 ah_attr->port_num,
206 ah_attr->grh.sgid_index, &gid);
207 if (rc) {
208 ehca_err(ah->device, "Failed to retrieve sgid "
209 "ehca_query_gid() returned %x "
210 "ah=%p ah_attr=%p port_num=%x "
211 "sgid_index=%x",
212 rc, ah, ah_attr, ah_attr->port_num,
213 ah_attr->grh.sgid_index);
214 return -EINVAL;
215 }
216 memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
217 }
218
219 new_ehca_av.pmtu = shca->max_mtu;
220
221 memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
222 sizeof(ah_attr->grh.dgid));
223
224 av = container_of(ah, struct ehca_av, ib_ah);
225 av->av = new_ehca_av;
226
227 return 0;
228 }
229
ehca_query_ah(struct ib_ah * ah,struct ib_ah_attr * ah_attr)230 int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
231 {
232 struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);
233
234 memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
235 sizeof(ah_attr->grh.dgid));
236 ah_attr->sl = av->av.sl;
237
238 ah_attr->dlid = av->av.dlid;
239
240 ah_attr->src_path_bits = av->av.slid_path_bits;
241 ah_attr->static_rate = av->av.ipd;
242 ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
243 ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
244 av->av.grh.word_0);
245 ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
246 av->av.grh.word_0);
247 ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
248 av->av.grh.word_0);
249
250 return 0;
251 }
252
ehca_destroy_ah(struct ib_ah * ah)253 int ehca_destroy_ah(struct ib_ah *ah)
254 {
255 kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));
256
257 return 0;
258 }
259
ehca_init_av_cache(void)260 int ehca_init_av_cache(void)
261 {
262 av_cache = kmem_cache_create("ehca_cache_av",
263 sizeof(struct ehca_av), 0,
264 SLAB_HWCACHE_ALIGN,
265 NULL);
266 if (!av_cache)
267 return -ENOMEM;
268 return 0;
269 }
270
ehca_cleanup_av_cache(void)271 void ehca_cleanup_av_cache(void)
272 {
273 if (av_cache)
274 kmem_cache_destroy(av_cache);
275 }
276