summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/mthca/mthca_mad.c
blob: 4ace6a392f41f030af8d01b2a6ec76c4968f23a0 (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
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2004 Voltaire, Inc. 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: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/string.h>
#include <linux/slab.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_mad.h>
#include <rdma/ib_smi.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"

enum {
	MTHCA_VENDOR_CLASS1 = 0x9,
	MTHCA_VENDOR_CLASS2 = 0xa
};

static void update_sm_ah(struct mthca_dev *dev,
			 u8 port_num, u16 lid, u8 sl)
{
	struct ib_ah *new_ah;
	struct ib_ah_attr ah_attr;
	unsigned long flags;

	if (!dev->send_agent[port_num - 1][0])
		return;

	memset(&ah_attr, 0, sizeof ah_attr);
	ah_attr.dlid     = lid;
	ah_attr.sl       = sl;
	ah_attr.port_num = port_num;

	new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
			      &ah_attr);
	if (IS_ERR(new_ah))
		return;

	spin_lock_irqsave(&dev->sm_lock, flags);
	if (dev->sm_ah[port_num - 1])
		ib_destroy_ah(dev->sm_ah[port_num - 1]);
	dev->sm_ah[port_num - 1] = new_ah;
	spin_unlock_irqrestore(&dev->sm_lock, flags);
}

/*
 * Snoop SM MADs for port info and P_Key table sets, so we can
 * synthesize LID change and P_Key change events.
 */
static void smp_snoop(struct ib_device *ibdev,
		      u8 port_num,
		      struct ib_mad *mad)
{
	struct ib_event event;

	if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
	     mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
	    mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
			update_sm_ah(to_mdev(ibdev), port_num,
				     be16_to_cpup((__be16 *) (mad->data + 58)),
				     (*(u8 *) (mad->data + 76)) & 0xf);

			event.device           = ibdev;
			event.event            = IB_EVENT_LID_CHANGE;
			event.element.port_num = port_num;
			ib_dispatch_event(&event);
		}

		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
			event.device           = ibdev;
			event.event            = IB_EVENT_PKEY_CHANGE;
			event.element.port_num = port_num;
			ib_dispatch_event(&event);
		}
	}
}

static void node_desc_override(struct ib_device *dev,
			       struct ib_mad *mad)
{
	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
	    mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
	    mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
		mutex_lock(&to_mdev(dev)->cap_mask_mutex);
		memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
	}
}

static void forward_trap(struct mthca_dev *dev,
			 u8 port_num,
			 struct ib_mad *mad)
{
	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
	struct ib_mad_send_buf *send_buf;
	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
	int ret;
	unsigned long flags;

	if (agent) {
		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
					      IB_MGMT_MAD_DATA, GFP_ATOMIC);
		/*
		 * We rely here on the fact that MLX QPs don't use the
		 * address handle after the send is posted (this is
		 * wrong following the IB spec strictly, but we know
		 * it's OK for our devices).
		 */
		spin_lock_irqsave(&dev->sm_lock, flags);
		memcpy(send_buf->mad, mad, sizeof *mad);
		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
			ret = ib_post_send_mad(send_buf, NULL);
		else
			ret = -EINVAL;
		spin_unlock_irqrestore(&dev->sm_lock, flags);

		if (ret)
			ib_free_send_mad(send_buf);
	}
}

int mthca_process_mad(struct ib_device *ibdev,
		      int mad_flags,
		      u8 port_num,
		      struct ib_wc *in_wc,
		      struct ib_grh *in_grh,
		      struct ib_mad *in_mad,
		      struct ib_mad *out_mad)
{
	int err;
	u8 status;
	u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);

	/* Forward locally generated traps to the SM */
	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
	    slid == 0) {
		forward_trap(to_mdev(ibdev), port_num, in_mad);
		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
	}

	/*
	 * Only handle SM gets, sets and trap represses for SM class
	 *
	 * Only handle PMA and Mellanox vendor-specific class gets and
	 * sets for other classes.
	 */
	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
			return IB_MAD_RESULT_SUCCESS;

		/*
		 * Don't process SMInfo queries or vendor-specific
		 * MADs -- the SMA can't handle them.
		 */
		if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
		    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
		     IB_SMP_ATTR_VENDOR_MASK))
			return IB_MAD_RESULT_SUCCESS;
	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
			return IB_MAD_RESULT_SUCCESS;
	} else
		return IB_MAD_RESULT_SUCCESS;

	err = mthca_MAD_IFC(to_mdev(ibdev),
			    mad_flags & IB_MAD_IGNORE_MKEY,
			    mad_flags & IB_MAD_IGNORE_BKEY,
			    port_num, in_wc, in_grh, in_mad, out_mad,
			    &status);
	if (err) {
		mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
		return IB_MAD_RESULT_FAILURE;
	}
	if (status == MTHCA_CMD_STAT_BAD_PKT)
		return IB_MAD_RESULT_SUCCESS;
	if (status) {
		mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
			  status);
		return IB_MAD_RESULT_FAILURE;
	}

	if (!out_mad->mad_hdr.status) {
		smp_snoop(ibdev, port_num, in_mad);
		node_desc_override(ibdev, out_mad);
	}

	/* set return bit in status of directed route responses */
	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);

	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
		/* no response for trap repress */
		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;

	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}

static void send_handler(struct ib_mad_agent *agent,
			 struct ib_mad_send_wc *mad_send_wc)
{
	ib_free_send_mad(mad_send_wc->send_buf);
}

int mthca_create_agents(struct mthca_dev *dev)
{
	struct ib_mad_agent *agent;
	int p, q;

	spin_lock_init(&dev->sm_lock);

	for (p = 0; p < dev->limits.num_ports; ++p)
		for (q = 0; q <= 1; ++q) {
			agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
						      q ? IB_QPT_GSI : IB_QPT_SMI,
						      NULL, 0, send_handler,
						      NULL, NULL);
			if (IS_ERR(agent))
				goto err;
			dev->send_agent[p][q] = agent;
		}

	return 0;

err:
	for (p = 0; p < dev->limits.num_ports; ++p)
		for (q = 0; q <= 1; ++q)
			if (dev->send_agent[p][q])
				ib_unregister_mad_agent(dev->send_agent[p][q]);

	return PTR_ERR(agent);
}

void mthca_free_agents(struct mthca_dev *dev)
{
	struct ib_mad_agent *agent;
	int p, q;

	for (p = 0; p < dev->limits.num_ports; ++p) {
		for (q = 0; q <= 1; ++q) {
			agent = dev->send_agent[p][q];
			dev->send_agent[p][q] = NULL;
			ib_unregister_mad_agent(agent);
		}

		if (dev->sm_ah[p])
			ib_destroy_ah(dev->sm_ah[p]);
	}
}
OpenPOWER on IntegriCloud