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
38 #include "mlx4_ib.h"
39
40 enum {
41 MLX4_IB_VENDOR_CLASS1 = 0x9,
42 MLX4_IB_VENDOR_CLASS2 = 0xa
43 };
44
45 int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
46 int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
47 void *in_mad, void *response_mad)
48 {
49 struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
50 void *inbox;
51 int err;
52 u32 in_modifier = port;
53 u8 op_modifier = 0;
54
55 inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
56 if (IS_ERR(inmailbox))
57 return PTR_ERR(inmailbox);
58 inbox = inmailbox->buf;
59
60 outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
61 if (IS_ERR(outmailbox)) {
62 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
63 return PTR_ERR(outmailbox);
64 }
65
66 memcpy(inbox, in_mad, 256);
67
68 /*
69 * Key check traps can't be generated unless we have in_wc to
70 * tell us where to send the trap.
71 */
72 if (ignore_mkey || !in_wc)
73 op_modifier |= 0x1;
74 if (ignore_bkey || !in_wc)
75 op_modifier |= 0x2;
76
77 if (in_wc) {
78 struct {
79 __be32 my_qpn;
80 u32 reserved1;
81 __be32 rqpn;
82 u8 sl;
83 u8 g_path;
84 u16 reserved2[2];
85 __be16 pkey;
86 u32 reserved3[11];
87 u8 grh[40];
88 } *ext_info;
89
90 memset(inbox + 256, 0, 256);
91 ext_info = inbox + 256;
92
93 ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
94 ext_info->rqpn = cpu_to_be32(in_wc->src_qp);
95 ext_info->sl = in_wc->sl << 4;
96 ext_info->g_path = in_wc->dlid_path_bits |
97 (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
98 ext_info->pkey = cpu_to_be16(in_wc->pkey_index);
99
100 if (in_grh)
101 memcpy(ext_info->grh, in_grh, 40);
102
103 op_modifier |= 0x4;
104
105 in_modifier |= in_wc->slid << 16;
106 }
107
108 err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
109 in_modifier, op_modifier,
110 MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C);
111
112 if (!err)
113 memcpy(response_mad, outmailbox->buf, 256);
114
115 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
116 mlx4_free_cmd_mailbox(dev->dev, outmailbox);
117
118 return err;
119 }
120
121 static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
122 {
123 struct ib_ah *new_ah;
124 struct ib_ah_attr ah_attr;
125
126 if (!dev->send_agent[port_num - 1][0])
127 return;
128
129 memset(&ah_attr, 0, sizeof ah_attr);
130 ah_attr.dlid = lid;
131 ah_attr.sl = sl;
132 ah_attr.port_num = port_num;
133
134 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
135 &ah_attr);
136 if (IS_ERR(new_ah))
137 return;
138
139 spin_lock(&dev->sm_lock);
140 if (dev->sm_ah[port_num - 1])
141 ib_destroy_ah(dev->sm_ah[port_num - 1]);
142 dev->sm_ah[port_num - 1] = new_ah;
143 spin_unlock(&dev->sm_lock);
144 }
145
146 /*
147 * Snoop SM MADs for port info and P_Key table sets, so we can
148 * synthesize LID change and P_Key change events.
149 */
150 static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad)
151 {
152 struct ib_event event;
153
154 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
155 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
156 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
157 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
158 struct ib_port_info *pinfo =
159 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
160
161 update_sm_ah(to_mdev(ibdev), port_num,
162 be16_to_cpu(pinfo->sm_lid),
163 pinfo->neighbormtu_mastersmsl & 0xf);
164
165 event.device = ibdev;
166 event.element.port_num = port_num;
167
168 if(pinfo->clientrereg_resv_subnetto & 0x80)
169 event.event = IB_EVENT_CLIENT_REREGISTER;
170 else
171 event.event = IB_EVENT_LID_CHANGE;
172
173 ib_dispatch_event(&event);
174 }
175
176 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
177 event.device = ibdev;
178 event.event = IB_EVENT_PKEY_CHANGE;
179 event.element.port_num = port_num;
180 ib_dispatch_event(&event);
181 }
182 }
183 }
184
185 static void node_desc_override(struct ib_device *dev,
186 struct ib_mad *mad)
187 {
188 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
189 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
190 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
191 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
192 spin_lock(&to_mdev(dev)->sm_lock);
193 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
194 spin_unlock(&to_mdev(dev)->sm_lock);
195 }
196 }
197
198 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
199 {
200 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
201 struct ib_mad_send_buf *send_buf;
202 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
203 int ret;
204
205 if (agent) {
206 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
207 IB_MGMT_MAD_DATA, GFP_ATOMIC);
208 /*
209 * We rely here on the fact that MLX QPs don't use the
210 * address handle after the send is posted (this is
211 * wrong following the IB spec strictly, but we know
212 * it's OK for our devices).
213 */
214 spin_lock(&dev->sm_lock);
215 memcpy(send_buf->mad, mad, sizeof *mad);
216 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
217 ret = ib_post_send_mad(send_buf, NULL);
218 else
219 ret = -EINVAL;
220 spin_unlock(&dev->sm_lock);
221
222 if (ret)
223 ib_free_send_mad(send_buf);
224 }
225 }
226
227 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
228 struct ib_wc *in_wc, struct ib_grh *in_grh,
229 struct ib_mad *in_mad, struct ib_mad *out_mad)
230 {
231 u16 slid;
232 int err;
233
234 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
235
236 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
237 forward_trap(to_mdev(ibdev), port_num, in_mad);
238 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
239 }
240
241 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
242 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
243 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
244 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
245 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
246 return IB_MAD_RESULT_SUCCESS;
247
248 /*
249 * Don't process SMInfo queries or vendor-specific
250 * MADs -- the SMA can't handle them.
251 */
252 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
253 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
254 IB_SMP_ATTR_VENDOR_MASK))
255 return IB_MAD_RESULT_SUCCESS;
256 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
257 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1 ||
258 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2) {
259 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
260 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
261 return IB_MAD_RESULT_SUCCESS;
262 } else
263 return IB_MAD_RESULT_SUCCESS;
264
265 err = mlx4_MAD_IFC(to_mdev(ibdev),
266 mad_flags & IB_MAD_IGNORE_MKEY,
267 mad_flags & IB_MAD_IGNORE_BKEY,
268 port_num, in_wc, in_grh, in_mad, out_mad);
269 if (err)
270 return IB_MAD_RESULT_FAILURE;
271
272 if (!out_mad->mad_hdr.status) {
273 smp_snoop(ibdev, port_num, in_mad);
274 node_desc_override(ibdev, out_mad);
275 }
276
277 /* set return bit in status of directed route responses */
278 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
279 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
280
281 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
282 /* no response for trap repress */
283 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
284
285 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
286 }
287
288 static void send_handler(struct ib_mad_agent *agent,
289 struct ib_mad_send_wc *mad_send_wc)
290 {
291 ib_free_send_mad(mad_send_wc->send_buf);
292 }
293
294 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
295 {
296 struct ib_mad_agent *agent;
297 int p, q;
298 int ret;
299
300 for (p = 0; p < dev->dev->caps.num_ports; ++p)
301 for (q = 0; q <= 1; ++q) {
302 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
303 q ? IB_QPT_GSI : IB_QPT_SMI,
304 NULL, 0, send_handler,
305 NULL, NULL);
306 if (IS_ERR(agent)) {
307 ret = PTR_ERR(agent);
308 goto err;
309 }
310 dev->send_agent[p][q] = agent;
311 }
312
313 return 0;
314
315 err:
316 for (p = 0; p < dev->dev->caps.num_ports; ++p)
317 for (q = 0; q <= 1; ++q)
318 if (dev->send_agent[p][q])
319 ib_unregister_mad_agent(dev->send_agent[p][q]);
320
321 return ret;
322 }
323
324 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
325 {
326 struct ib_mad_agent *agent;
327 int p, q;
328
329 for (p = 0; p < dev->dev->caps.num_ports; ++p) {
330 for (q = 0; q <= 1; ++q) {
331 agent = dev->send_agent[p][q];
332 dev->send_agent[p][q] = NULL;
333 ib_unregister_mad_agent(agent);
334 }
335
336 if (dev->sm_ah[p])
337 ib_destroy_ah(dev->sm_ah[p]);
338 }
339 }
340
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