1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <linux/string.h>
36 #include <linux/slab.h>
37
38 #include <rdma/ib_verbs.h>
39 #include <rdma/ib_mad.h>
40 #include <rdma/ib_smi.h>
41
42 #include "mthca_dev.h"
43 #include "mthca_cmd.h"
44
45 enum {
46 MTHCA_VENDOR_CLASS1 = 0x9,
47 MTHCA_VENDOR_CLASS2 = 0xa
48 };
49
mthca_update_rate(struct mthca_dev * dev,u8 port_num)50 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
51 {
52 struct ib_port_attr *tprops = NULL;
53 int ret;
54
55 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
56 if (!tprops)
57 return -ENOMEM;
58
59 ret = ib_query_port(&dev->ib_dev, port_num, tprops);
60 if (ret) {
61 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
62 ret, dev->ib_dev.name, port_num);
63 goto out;
64 }
65
66 dev->rate[port_num - 1] = tprops->active_speed *
67 ib_width_enum_to_int(tprops->active_width);
68
69 out:
70 kfree(tprops);
71 return ret;
72 }
73
update_sm_ah(struct mthca_dev * dev,u8 port_num,u16 lid,u8 sl)74 static void update_sm_ah(struct mthca_dev *dev,
75 u8 port_num, u16 lid, u8 sl)
76 {
77 struct ib_ah *new_ah;
78 struct ib_ah_attr ah_attr;
79 unsigned long flags;
80
81 if (!dev->send_agent[port_num - 1][0])
82 return;
83
84 memset(&ah_attr, 0, sizeof ah_attr);
85 ah_attr.dlid = lid;
86 ah_attr.sl = sl;
87 ah_attr.port_num = port_num;
88
89 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
90 &ah_attr, 0);
91 if (IS_ERR(new_ah))
92 return;
93
94 spin_lock_irqsave(&dev->sm_lock, flags);
95 if (dev->sm_ah[port_num - 1])
96 ib_destroy_ah(dev->sm_ah[port_num - 1], 0);
97 dev->sm_ah[port_num - 1] = new_ah;
98 spin_unlock_irqrestore(&dev->sm_lock, flags);
99 }
100
101 /*
102 * Snoop SM MADs for port info and P_Key table sets, so we can
103 * synthesize LID change and P_Key change events.
104 */
smp_snoop(struct ib_device * ibdev,u8 port_num,const struct ib_mad * mad,u16 prev_lid)105 static void smp_snoop(struct ib_device *ibdev,
106 u8 port_num,
107 const struct ib_mad *mad,
108 u16 prev_lid)
109 {
110 struct ib_event event;
111
112 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
113 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
114 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
115 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
116 struct ib_port_info *pinfo =
117 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
118 u16 lid = be16_to_cpu(pinfo->lid);
119
120 mthca_update_rate(to_mdev(ibdev), port_num);
121 update_sm_ah(to_mdev(ibdev), port_num,
122 be16_to_cpu(pinfo->sm_lid),
123 pinfo->neighbormtu_mastersmsl & 0xf);
124
125 event.device = ibdev;
126 event.element.port_num = port_num;
127
128 if (pinfo->clientrereg_resv_subnetto & 0x80) {
129 event.event = IB_EVENT_CLIENT_REREGISTER;
130 ib_dispatch_event(&event);
131 }
132
133 if (prev_lid != lid) {
134 event.event = IB_EVENT_LID_CHANGE;
135 ib_dispatch_event(&event);
136 }
137 }
138
139 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
140 event.device = ibdev;
141 event.event = IB_EVENT_PKEY_CHANGE;
142 event.element.port_num = port_num;
143 ib_dispatch_event(&event);
144 }
145 }
146 }
147
node_desc_override(struct ib_device * dev,struct ib_mad * mad)148 static void node_desc_override(struct ib_device *dev,
149 struct ib_mad *mad)
150 {
151 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
152 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
153 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
154 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
155 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
156 memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
157 IB_DEVICE_NODE_DESC_MAX);
158 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
159 }
160 }
161
forward_trap(struct mthca_dev * dev,u8 port_num,const struct ib_mad * mad)162 static void forward_trap(struct mthca_dev *dev,
163 u8 port_num,
164 const struct ib_mad *mad)
165 {
166 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
167 struct ib_mad_send_buf *send_buf;
168 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
169 int ret;
170 unsigned long flags;
171
172 if (agent) {
173 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
174 IB_MGMT_MAD_DATA, GFP_ATOMIC,
175 IB_MGMT_BASE_VERSION);
176 if (IS_ERR(send_buf))
177 return;
178 /*
179 * We rely here on the fact that MLX QPs don't use the
180 * address handle after the send is posted (this is
181 * wrong following the IB spec strictly, but we know
182 * it's OK for our devices).
183 */
184 spin_lock_irqsave(&dev->sm_lock, flags);
185 memcpy(send_buf->mad, mad, sizeof *mad);
186 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
187 ret = ib_post_send_mad(send_buf, NULL);
188 else
189 ret = -EINVAL;
190 spin_unlock_irqrestore(&dev->sm_lock, flags);
191
192 if (ret)
193 ib_free_send_mad(send_buf);
194 }
195 }
196
mthca_process_mad(struct ib_device * ibdev,int mad_flags,u8 port_num,const struct ib_wc * in_wc,const struct ib_grh * in_grh,const struct ib_mad_hdr * in,size_t in_mad_size,struct ib_mad_hdr * out,size_t * out_mad_size,u16 * out_mad_pkey_index)197 int mthca_process_mad(struct ib_device *ibdev,
198 int mad_flags,
199 u8 port_num,
200 const struct ib_wc *in_wc,
201 const struct ib_grh *in_grh,
202 const struct ib_mad_hdr *in, size_t in_mad_size,
203 struct ib_mad_hdr *out, size_t *out_mad_size,
204 u16 *out_mad_pkey_index)
205 {
206 int err;
207 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
208 u16 prev_lid = 0;
209 struct ib_port_attr pattr;
210 const struct ib_mad *in_mad = (const struct ib_mad *)in;
211 struct ib_mad *out_mad = (struct ib_mad *)out;
212
213 if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
214 *out_mad_size != sizeof(*out_mad)))
215 return IB_MAD_RESULT_FAILURE;
216
217 /* Forward locally generated traps to the SM */
218 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
219 slid == 0) {
220 forward_trap(to_mdev(ibdev), port_num, in_mad);
221 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
222 }
223
224 /*
225 * Only handle SM gets, sets and trap represses for SM class
226 *
227 * Only handle PMA and Mellanox vendor-specific class gets and
228 * sets for other classes.
229 */
230 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
231 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
232 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
233 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
234 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
235 return IB_MAD_RESULT_SUCCESS;
236
237 /*
238 * Don't process SMInfo queries or vendor-specific
239 * MADs -- the SMA can't handle them.
240 */
241 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
242 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
243 IB_SMP_ATTR_VENDOR_MASK))
244 return IB_MAD_RESULT_SUCCESS;
245 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
246 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
247 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
248 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
249 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
250 return IB_MAD_RESULT_SUCCESS;
251 } else
252 return IB_MAD_RESULT_SUCCESS;
253 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
254 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
255 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
256 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
257 !ib_query_port(ibdev, port_num, &pattr))
258 prev_lid = pattr.lid;
259
260 err = mthca_MAD_IFC(to_mdev(ibdev),
261 mad_flags & IB_MAD_IGNORE_MKEY,
262 mad_flags & IB_MAD_IGNORE_BKEY,
263 port_num, in_wc, in_grh, in_mad, out_mad);
264 if (err == -EBADMSG)
265 return IB_MAD_RESULT_SUCCESS;
266 else if (err) {
267 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
268 return IB_MAD_RESULT_FAILURE;
269 }
270
271 if (!out_mad->mad_hdr.status) {
272 smp_snoop(ibdev, port_num, in_mad, prev_lid);
273 node_desc_override(ibdev, out_mad);
274 }
275
276 /* set return bit in status of directed route responses */
277 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
278 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
279
280 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
281 /* no response for trap repress */
282 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
283
284 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
285 }
286
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)287 static void send_handler(struct ib_mad_agent *agent,
288 struct ib_mad_send_wc *mad_send_wc)
289 {
290 ib_free_send_mad(mad_send_wc->send_buf);
291 }
292
mthca_create_agents(struct mthca_dev * dev)293 int mthca_create_agents(struct mthca_dev *dev)
294 {
295 struct ib_mad_agent *agent;
296 int p, q;
297 int ret;
298
299 spin_lock_init(&dev->sm_lock);
300
301 for (p = 0; p < dev->limits.num_ports; ++p)
302 for (q = 0; q <= 1; ++q) {
303 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
304 q ? IB_QPT_GSI : IB_QPT_SMI,
305 NULL, 0, send_handler,
306 NULL, NULL, 0);
307 if (IS_ERR(agent)) {
308 ret = PTR_ERR(agent);
309 goto err;
310 }
311 dev->send_agent[p][q] = agent;
312 }
313
314 for (p = 1; p <= dev->limits.num_ports; ++p) {
315 ret = mthca_update_rate(dev, p);
316 if (ret) {
317 mthca_err(dev, "Failed to obtain port %d rate."
318 " aborting.\n", p);
319 goto err;
320 }
321 }
322
323 return 0;
324
325 err:
326 for (p = 0; p < dev->limits.num_ports; ++p)
327 for (q = 0; q <= 1; ++q)
328 if (dev->send_agent[p][q])
329 ib_unregister_mad_agent(dev->send_agent[p][q]);
330
331 return ret;
332 }
333
mthca_free_agents(struct mthca_dev * dev)334 void mthca_free_agents(struct mthca_dev *dev)
335 {
336 struct ib_mad_agent *agent;
337 int p, q;
338
339 for (p = 0; p < dev->limits.num_ports; ++p) {
340 for (q = 0; q <= 1; ++q) {
341 agent = dev->send_agent[p][q];
342 dev->send_agent[p][q] = NULL;
343 ib_unregister_mad_agent(agent);
344 }
345
346 if (dev->sm_ah[p])
347 ib_destroy_ah(dev->sm_ah[p],
348 RDMA_DESTROY_AH_SLEEPABLE);
349 }
350 }
351