summaryrefslogtreecommitdiff
path: root/drivers/infiniband/core/agent.c
blob: 23d1957c4b29ef254d197375bedc568d3bff990a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
 */

#include <linux/dma-mapping.h>

#include <asm/bug.h>

#include <ib_smi.h>

#include "smi.h"
#include "agent_priv.h"
#include "mad_priv.h"
#include "agent.h"

spinlock_t ib_agent_port_list_lock;
static LIST_HEAD(ib_agent_port_list);

/*
 * Caller must hold ib_agent_port_list_lock
 */
static inline struct ib_agent_port_private *
__ib_get_agent_port(struct ib_device *device, int port_num,
		    struct ib_mad_agent *mad_agent)
{
	struct ib_agent_port_private *entry;

	BUG_ON(!(!!device ^ !!mad_agent));  /* Exactly one MUST be (!NULL) */

	if (device) {
		list_for_each_entry(entry, &ib_agent_port_list, port_list) {
			if (entry->smp_agent->device == device &&
			    entry->port_num == port_num)
				return entry;
		}
	} else {
		list_for_each_entry(entry, &ib_agent_port_list, port_list) {
			if ((entry->smp_agent == mad_agent) ||
			    (entry->perf_mgmt_agent == mad_agent))
				return entry;
		}
	}
	return NULL;
}

static inline struct ib_agent_port_private *
ib_get_agent_port(struct ib_device *device, int port_num,
		  struct ib_mad_agent *mad_agent)
{
	struct ib_agent_port_private *entry;
	unsigned long flags;

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	entry = __ib_get_agent_port(device, port_num, mad_agent);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	return entry;
}

int smi_check_local_dr_smp(struct ib_smp *smp,
			   struct ib_device *device,
			   int port_num)
{
	struct ib_agent_port_private *port_priv;

	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
		return 1;
	port_priv = ib_get_agent_port(device, port_num, NULL);
	if (!port_priv) {
		printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
		       "not open\n",
		       device->name, port_num);
		return 1;
	}

	return smi_check_local_smp(port_priv->smp_agent, smp);
}

static int agent_mad_send(struct ib_mad_agent *mad_agent,
			  struct ib_agent_port_private *port_priv,
			  struct ib_mad_private *mad_priv,
			  struct ib_grh *grh,
			  struct ib_wc *wc)
{
	struct ib_agent_send_wr *agent_send_wr;
	struct ib_sge gather_list;
	struct ib_send_wr send_wr;
	struct ib_send_wr *bad_send_wr;
	struct ib_ah_attr ah_attr;
	unsigned long flags;
	int ret = 1;

	agent_send_wr = kmalloc(sizeof(*agent_send_wr), GFP_KERNEL);
	if (!agent_send_wr)
		goto out;
	agent_send_wr->mad = mad_priv;

	gather_list.addr = dma_map_single(mad_agent->device->dma_device,
					  &mad_priv->mad,
					  sizeof(mad_priv->mad),
					  DMA_TO_DEVICE);
	gather_list.length = sizeof(mad_priv->mad);
	gather_list.lkey = (*port_priv->mr).lkey;

	send_wr.next = NULL;
	send_wr.opcode = IB_WR_SEND;
	send_wr.sg_list = &gather_list;
	send_wr.num_sge = 1;
	send_wr.wr.ud.remote_qpn = wc->src_qp; /* DQPN */
	send_wr.wr.ud.timeout_ms = 0;
	send_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_SOLICITED;

	ah_attr.dlid = wc->slid;
	ah_attr.port_num = mad_agent->port_num;
	ah_attr.src_path_bits = wc->dlid_path_bits;
	ah_attr.sl = wc->sl;
	ah_attr.static_rate = 0;
	ah_attr.ah_flags = 0; /* No GRH */
	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
		if (wc->wc_flags & IB_WC_GRH) {
			ah_attr.ah_flags = IB_AH_GRH;
			/* Should sgid be looked up ? */
			ah_attr.grh.sgid_index = 0;
			ah_attr.grh.hop_limit = grh->hop_limit;
			ah_attr.grh.flow_label = be32_to_cpup(
				&grh->version_tclass_flow)  & 0xfffff;
			ah_attr.grh.traffic_class = (be32_to_cpup(
				&grh->version_tclass_flow) >> 20) & 0xff;
			memcpy(ah_attr.grh.dgid.raw,
			       grh->sgid.raw,
			       sizeof(ah_attr.grh.dgid));
		}
	}

	agent_send_wr->ah = ib_create_ah(mad_agent->qp->pd, &ah_attr);
	if (IS_ERR(agent_send_wr->ah)) {
		printk(KERN_ERR SPFX "No memory for address handle\n");
		kfree(agent_send_wr);
		goto out;
	}

	send_wr.wr.ud.ah = agent_send_wr->ah;
	if (mad_priv->mad.mad.mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
		send_wr.wr.ud.pkey_index = wc->pkey_index;
		send_wr.wr.ud.remote_qkey = IB_QP1_QKEY;
	} else { 	/* for SMPs */
		send_wr.wr.ud.pkey_index = 0;
		send_wr.wr.ud.remote_qkey = 0;
	}
	send_wr.wr.ud.mad_hdr = &mad_priv->mad.mad.mad_hdr;
	send_wr.wr_id = (unsigned long)agent_send_wr;

	pci_unmap_addr_set(agent_send_wr, mapping, gather_list.addr);

	/* Send */
	spin_lock_irqsave(&port_priv->send_list_lock, flags);
	if (ib_post_send_mad(mad_agent, &send_wr, &bad_send_wr)) {
		spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
		dma_unmap_single(mad_agent->device->dma_device,
				 pci_unmap_addr(agent_send_wr, mapping),
				 sizeof(mad_priv->mad),
				 DMA_TO_DEVICE);
		ib_destroy_ah(agent_send_wr->ah);
		kfree(agent_send_wr);
	} else {
		list_add_tail(&agent_send_wr->send_list,
			      &port_priv->send_posted_list);
		spin_unlock_irqrestore(&port_priv->send_list_lock, flags);
		ret = 0;
	}

out:
	return ret;
}

int agent_send(struct ib_mad_private *mad,
	       struct ib_grh *grh,
	       struct ib_wc *wc,
	       struct ib_device *device,
	       int port_num)
{
	struct ib_agent_port_private *port_priv;
	struct ib_mad_agent *mad_agent;

	port_priv = ib_get_agent_port(device, port_num, NULL);
	if (!port_priv) {
		printk(KERN_DEBUG SPFX "agent_send %s port %d not open\n",
		       device->name, port_num);
		return 1;
	}

	/* Get mad agent based on mgmt_class in MAD */
	switch (mad->mad.mad.mad_hdr.mgmt_class) {
		case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
		case IB_MGMT_CLASS_SUBN_LID_ROUTED:
			mad_agent = port_priv->smp_agent;
			break;
		case IB_MGMT_CLASS_PERF_MGMT:
			mad_agent = port_priv->perf_mgmt_agent;
			break;
		default:
			return 1;
	}

	return agent_mad_send(mad_agent, port_priv, mad, grh, wc);
}

static void agent_send_handler(struct ib_mad_agent *mad_agent,
			       struct ib_mad_send_wc *mad_send_wc)
{
	struct ib_agent_port_private	*port_priv;
	struct ib_agent_send_wr		*agent_send_wr;
	unsigned long			flags;

	/* Find matching MAD agent */
	port_priv = ib_get_agent_port(NULL, 0, mad_agent);
	if (!port_priv) {
		printk(KERN_ERR SPFX "agent_send_handler: no matching MAD "
		       "agent %p\n", mad_agent);
		return;
	}

	agent_send_wr = (struct ib_agent_send_wr *)(unsigned long)mad_send_wc->wr_id;
	spin_lock_irqsave(&port_priv->send_list_lock, flags);
	/* Remove completed send from posted send MAD list */
	list_del(&agent_send_wr->send_list);
	spin_unlock_irqrestore(&port_priv->send_list_lock, flags);

	dma_unmap_single(mad_agent->device->dma_device,
			 pci_unmap_addr(agent_send_wr, mapping),
			 sizeof(agent_send_wr->mad->mad),
			 DMA_TO_DEVICE);

	ib_destroy_ah(agent_send_wr->ah);

	/* Release allocated memory */
	kmem_cache_free(ib_mad_cache, agent_send_wr->mad);
	kfree(agent_send_wr);
}

int ib_agent_port_open(struct ib_device *device, int port_num)
{
	int ret;
	struct ib_agent_port_private *port_priv;
	unsigned long flags;

	/* First, check if port already open for SMI */
	port_priv = ib_get_agent_port(device, port_num, NULL);
	if (port_priv) {
		printk(KERN_DEBUG SPFX "%s port %d already open\n",
		       device->name, port_num);
		return 0;
	}

	/* Create new device info */
	port_priv = kmalloc(sizeof *port_priv, GFP_KERNEL);
	if (!port_priv) {
		printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
		ret = -ENOMEM;
		goto error1;
	}

	memset(port_priv, 0, sizeof *port_priv);
	port_priv->port_num = port_num;
	spin_lock_init(&port_priv->send_list_lock);
	INIT_LIST_HEAD(&port_priv->send_posted_list);

	/* Obtain send only MAD agent for SM class (SMI QP) */
	port_priv->smp_agent = ib_register_mad_agent(device, port_num,
						     IB_QPT_SMI,
						     NULL, 0,
						    &agent_send_handler,
						     NULL, NULL);

	if (IS_ERR(port_priv->smp_agent)) {
		ret = PTR_ERR(port_priv->smp_agent);
		goto error2;
	}

	/* Obtain send only MAD agent for PerfMgmt class (GSI QP) */
	port_priv->perf_mgmt_agent = ib_register_mad_agent(device, port_num,
							   IB_QPT_GSI,
							   NULL, 0,
							  &agent_send_handler,
							   NULL, NULL);
	if (IS_ERR(port_priv->perf_mgmt_agent)) {
		ret = PTR_ERR(port_priv->perf_mgmt_agent);
		goto error3;
	}

	port_priv->mr = ib_get_dma_mr(port_priv->smp_agent->qp->pd,
				      IB_ACCESS_LOCAL_WRITE);
	if (IS_ERR(port_priv->mr)) {
		printk(KERN_ERR SPFX "Couldn't get DMA MR\n");
		ret = PTR_ERR(port_priv->mr);
		goto error4;
	}

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	list_add_tail(&port_priv->port_list, &ib_agent_port_list);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	return 0;

error4:
	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
error3:
	ib_unregister_mad_agent(port_priv->smp_agent);
error2:
	kfree(port_priv);
error1:
	return ret;
}

int ib_agent_port_close(struct ib_device *device, int port_num)
{
	struct ib_agent_port_private *port_priv;
	unsigned long flags;

	spin_lock_irqsave(&ib_agent_port_list_lock, flags);
	port_priv = __ib_get_agent_port(device, port_num, NULL);
	if (port_priv == NULL) {
		spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
		printk(KERN_ERR SPFX "Port %d not found\n", port_num);
		return -ENODEV;
	}
	list_del(&port_priv->port_list);
	spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

	ib_dereg_mr(port_priv->mr);

	ib_unregister_mad_agent(port_priv->perf_mgmt_agent);
	ib_unregister_mad_agent(port_priv->smp_agent);
	kfree(port_priv);

	return 0;
}