1 /*
2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <rdma/ib_mad.h>
34 #include <rdma/ib_smi.h>
35
36 #include <linux/mlx4/cmd.h>
37 #include <linux/gfp.h>
38 #include <rdma/ib_pma.h>
39
40 #include "mlx4_ib.h"
41
42 enum {
43 MLX4_IB_VENDOR_CLASS1 = 0x9,
44 MLX4_IB_VENDOR_CLASS2 = 0xa
45 };
46
mlx4_MAD_IFC(struct mlx4_ib_dev * dev,int ignore_mkey,int ignore_bkey,int port,struct ib_wc * in_wc,struct ib_grh * in_grh,void * in_mad,void * response_mad)47 int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
48 int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
49 void *in_mad, void *response_mad)
50 {
51 struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
52 void *inbox;
53 int err;
54 u32 in_modifier = port;
55 u8 op_modifier = 0;
56
57 inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
58 if (IS_ERR(inmailbox))
59 return PTR_ERR(inmailbox);
60 inbox = inmailbox->buf;
61
62 outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
63 if (IS_ERR(outmailbox)) {
64 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
65 return PTR_ERR(outmailbox);
66 }
67
68 memcpy(inbox, in_mad, 256);
69
70 /*
71 * Key check traps can't be generated unless we have in_wc to
72 * tell us where to send the trap.
73 */
74 if (ignore_mkey || !in_wc)
75 op_modifier |= 0x1;
76 if (ignore_bkey || !in_wc)
77 op_modifier |= 0x2;
78
79 if (in_wc) {
80 struct {
81 __be32 my_qpn;
82 u32 reserved1;
83 __be32 rqpn;
84 u8 sl;
85 u8 g_path;
86 u16 reserved2[2];
87 __be16 pkey;
88 u32 reserved3[11];
89 u8 grh[40];
90 } *ext_info;
91
92 memset(inbox + 256, 0, 256);
93 ext_info = inbox + 256;
94
95 ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
96 ext_info->rqpn = cpu_to_be32(in_wc->src_qp);
97 ext_info->sl = in_wc->sl << 4;
98 ext_info->g_path = in_wc->dlid_path_bits |
99 (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
100 ext_info->pkey = cpu_to_be16(in_wc->pkey_index);
101
102 if (in_grh)
103 memcpy(ext_info->grh, in_grh, 40);
104
105 op_modifier |= 0x4;
106
107 in_modifier |= in_wc->slid << 16;
108 }
109
110 err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
111 in_modifier, op_modifier,
112 MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C,
113 MLX4_CMD_NATIVE);
114
115 if (!err)
116 memcpy(response_mad, outmailbox->buf, 256);
117
118 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
119 mlx4_free_cmd_mailbox(dev->dev, outmailbox);
120
121 return err;
122 }
123
update_sm_ah(struct mlx4_ib_dev * dev,u8 port_num,u16 lid,u8 sl)124 static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
125 {
126 struct ib_ah *new_ah;
127 struct ib_ah_attr ah_attr;
128
129 if (!dev->send_agent[port_num - 1][0])
130 return;
131
132 memset(&ah_attr, 0, sizeof ah_attr);
133 ah_attr.dlid = lid;
134 ah_attr.sl = sl;
135 ah_attr.port_num = port_num;
136
137 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
138 &ah_attr);
139 if (IS_ERR(new_ah))
140 return;
141
142 spin_lock(&dev->sm_lock);
143 if (dev->sm_ah[port_num - 1])
144 ib_destroy_ah(dev->sm_ah[port_num - 1]);
145 dev->sm_ah[port_num - 1] = new_ah;
146 spin_unlock(&dev->sm_lock);
147 }
148
149 /*
150 * Snoop SM MADs for port info and P_Key table sets, so we can
151 * synthesize LID change and P_Key change events.
152 */
smp_snoop(struct ib_device * ibdev,u8 port_num,struct ib_mad * mad,u16 prev_lid)153 static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad,
154 u16 prev_lid)
155 {
156 struct ib_event event;
157
158 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
159 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
160 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
161 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
162 struct ib_port_info *pinfo =
163 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
164 u16 lid = be16_to_cpu(pinfo->lid);
165
166 update_sm_ah(to_mdev(ibdev), port_num,
167 be16_to_cpu(pinfo->sm_lid),
168 pinfo->neighbormtu_mastersmsl & 0xf);
169
170 event.device = ibdev;
171 event.element.port_num = port_num;
172
173 if (pinfo->clientrereg_resv_subnetto & 0x80) {
174 event.event = IB_EVENT_CLIENT_REREGISTER;
175 ib_dispatch_event(&event);
176 }
177
178 if (prev_lid != lid) {
179 event.event = IB_EVENT_LID_CHANGE;
180 ib_dispatch_event(&event);
181 }
182 }
183
184 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
185 event.device = ibdev;
186 event.event = IB_EVENT_PKEY_CHANGE;
187 event.element.port_num = port_num;
188 ib_dispatch_event(&event);
189 }
190 }
191 }
192
node_desc_override(struct ib_device * dev,struct ib_mad * mad)193 static void node_desc_override(struct ib_device *dev,
194 struct ib_mad *mad)
195 {
196 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
197 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
198 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
199 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
200 spin_lock(&to_mdev(dev)->sm_lock);
201 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
202 spin_unlock(&to_mdev(dev)->sm_lock);
203 }
204 }
205
forward_trap(struct mlx4_ib_dev * dev,u8 port_num,struct ib_mad * mad)206 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
207 {
208 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
209 struct ib_mad_send_buf *send_buf;
210 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
211 int ret;
212
213 if (agent) {
214 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
215 IB_MGMT_MAD_DATA, GFP_ATOMIC);
216 if (IS_ERR(send_buf))
217 return;
218 /*
219 * We rely here on the fact that MLX QPs don't use the
220 * address handle after the send is posted (this is
221 * wrong following the IB spec strictly, but we know
222 * it's OK for our devices).
223 */
224 spin_lock(&dev->sm_lock);
225 memcpy(send_buf->mad, mad, sizeof *mad);
226 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
227 ret = ib_post_send_mad(send_buf, NULL);
228 else
229 ret = -EINVAL;
230 spin_unlock(&dev->sm_lock);
231
232 if (ret)
233 ib_free_send_mad(send_buf);
234 }
235 }
236
ib_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)237 static int ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
238 struct ib_wc *in_wc, struct ib_grh *in_grh,
239 struct ib_mad *in_mad, struct ib_mad *out_mad)
240 {
241 u16 slid, prev_lid = 0;
242 int err;
243 struct ib_port_attr pattr;
244
245 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
246
247 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
248 forward_trap(to_mdev(ibdev), port_num, in_mad);
249 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
250 }
251
252 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
253 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
254 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
255 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
256 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
257 return IB_MAD_RESULT_SUCCESS;
258
259 /*
260 * Don't process SMInfo queries -- the SMA can't handle them.
261 */
262 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
263 return IB_MAD_RESULT_SUCCESS;
264 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
265 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1 ||
266 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2 ||
267 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
268 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
269 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
270 return IB_MAD_RESULT_SUCCESS;
271 } else
272 return IB_MAD_RESULT_SUCCESS;
273
274 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
275 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
276 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
277 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
278 !ib_query_port(ibdev, port_num, &pattr))
279 prev_lid = pattr.lid;
280
281 err = mlx4_MAD_IFC(to_mdev(ibdev),
282 mad_flags & IB_MAD_IGNORE_MKEY,
283 mad_flags & IB_MAD_IGNORE_BKEY,
284 port_num, in_wc, in_grh, in_mad, out_mad);
285 if (err)
286 return IB_MAD_RESULT_FAILURE;
287
288 if (!out_mad->mad_hdr.status) {
289 smp_snoop(ibdev, port_num, in_mad, prev_lid);
290 node_desc_override(ibdev, out_mad);
291 }
292
293 /* set return bit in status of directed route responses */
294 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
295 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
296
297 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
298 /* no response for trap repress */
299 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
300
301 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
302 }
303
edit_counter(struct mlx4_counter * cnt,struct ib_pma_portcounters * pma_cnt)304 static void edit_counter(struct mlx4_counter *cnt,
305 struct ib_pma_portcounters *pma_cnt)
306 {
307 pma_cnt->port_xmit_data = cpu_to_be32((be64_to_cpu(cnt->tx_bytes)>>2));
308 pma_cnt->port_rcv_data = cpu_to_be32((be64_to_cpu(cnt->rx_bytes)>>2));
309 pma_cnt->port_xmit_packets = cpu_to_be32(be64_to_cpu(cnt->tx_frames));
310 pma_cnt->port_rcv_packets = cpu_to_be32(be64_to_cpu(cnt->rx_frames));
311 }
312
iboe_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)313 static int iboe_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
314 struct ib_wc *in_wc, struct ib_grh *in_grh,
315 struct ib_mad *in_mad, struct ib_mad *out_mad)
316 {
317 struct mlx4_cmd_mailbox *mailbox;
318 struct mlx4_ib_dev *dev = to_mdev(ibdev);
319 int err;
320 u32 inmod = dev->counters[port_num - 1] & 0xffff;
321 u8 mode;
322
323 if (in_mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_PERF_MGMT)
324 return -EINVAL;
325
326 mailbox = mlx4_alloc_cmd_mailbox(dev->dev);
327 if (IS_ERR(mailbox))
328 return IB_MAD_RESULT_FAILURE;
329
330 err = mlx4_cmd_box(dev->dev, 0, mailbox->dma, inmod, 0,
331 MLX4_CMD_QUERY_IF_STAT, MLX4_CMD_TIME_CLASS_C,
332 MLX4_CMD_WRAPPED);
333 if (err)
334 err = IB_MAD_RESULT_FAILURE;
335 else {
336 memset(out_mad->data, 0, sizeof out_mad->data);
337 mode = ((struct mlx4_counter *)mailbox->buf)->counter_mode;
338 switch (mode & 0xf) {
339 case 0:
340 edit_counter(mailbox->buf,
341 (void *)(out_mad->data + 40));
342 err = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
343 break;
344 default:
345 err = IB_MAD_RESULT_FAILURE;
346 }
347 }
348
349 mlx4_free_cmd_mailbox(dev->dev, mailbox);
350
351 return err;
352 }
353
mlx4_ib_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)354 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
355 struct ib_wc *in_wc, struct ib_grh *in_grh,
356 struct ib_mad *in_mad, struct ib_mad *out_mad)
357 {
358 switch (rdma_port_get_link_layer(ibdev, port_num)) {
359 case IB_LINK_LAYER_INFINIBAND:
360 return ib_process_mad(ibdev, mad_flags, port_num, in_wc,
361 in_grh, in_mad, out_mad);
362 case IB_LINK_LAYER_ETHERNET:
363 return iboe_process_mad(ibdev, mad_flags, port_num, in_wc,
364 in_grh, in_mad, out_mad);
365 default:
366 return -EINVAL;
367 }
368 }
369
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)370 static void send_handler(struct ib_mad_agent *agent,
371 struct ib_mad_send_wc *mad_send_wc)
372 {
373 ib_free_send_mad(mad_send_wc->send_buf);
374 }
375
mlx4_ib_mad_init(struct mlx4_ib_dev * dev)376 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
377 {
378 struct ib_mad_agent *agent;
379 int p, q;
380 int ret;
381 enum rdma_link_layer ll;
382
383 for (p = 0; p < dev->num_ports; ++p) {
384 ll = rdma_port_get_link_layer(&dev->ib_dev, p + 1);
385 for (q = 0; q <= 1; ++q) {
386 if (ll == IB_LINK_LAYER_INFINIBAND) {
387 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
388 q ? IB_QPT_GSI : IB_QPT_SMI,
389 NULL, 0, send_handler,
390 NULL, NULL);
391 if (IS_ERR(agent)) {
392 ret = PTR_ERR(agent);
393 goto err;
394 }
395 dev->send_agent[p][q] = agent;
396 } else
397 dev->send_agent[p][q] = NULL;
398 }
399 }
400
401 return 0;
402
403 err:
404 for (p = 0; p < dev->num_ports; ++p)
405 for (q = 0; q <= 1; ++q)
406 if (dev->send_agent[p][q])
407 ib_unregister_mad_agent(dev->send_agent[p][q]);
408
409 return ret;
410 }
411
mlx4_ib_mad_cleanup(struct mlx4_ib_dev * dev)412 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
413 {
414 struct ib_mad_agent *agent;
415 int p, q;
416
417 for (p = 0; p < dev->num_ports; ++p) {
418 for (q = 0; q <= 1; ++q) {
419 agent = dev->send_agent[p][q];
420 if (agent) {
421 dev->send_agent[p][q] = NULL;
422 ib_unregister_mad_agent(agent);
423 }
424 }
425
426 if (dev->sm_ah[p])
427 ib_destroy_ah(dev->sm_ah[p]);
428 }
429 }
430