IB/mlx4: Fix dispatch of IB_EVENT_LID_CHANGE event
[linux-3.10.git] / drivers / infiniband / hw / mlx4 / mad.c
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                                 u16 prev_lid)
152 {
153         struct ib_event event;
154
155         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
156              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
157             mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
158                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
159                         struct ib_port_info *pinfo =
160                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
161                         u16 lid = be16_to_cpu(pinfo->lid);
162
163                         update_sm_ah(to_mdev(ibdev), port_num,
164                                      be16_to_cpu(pinfo->sm_lid),
165                                      pinfo->neighbormtu_mastersmsl & 0xf);
166
167                         event.device           = ibdev;
168                         event.element.port_num = port_num;
169
170                         if (pinfo->clientrereg_resv_subnetto & 0x80) {
171                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
172                                 ib_dispatch_event(&event);
173                         }
174
175                         if (prev_lid != lid) {
176                                 event.event    = IB_EVENT_LID_CHANGE;
177                                 ib_dispatch_event(&event);
178                         }
179                 }
180
181                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
182                         event.device           = ibdev;
183                         event.event            = IB_EVENT_PKEY_CHANGE;
184                         event.element.port_num = port_num;
185                         ib_dispatch_event(&event);
186                 }
187         }
188 }
189
190 static void node_desc_override(struct ib_device *dev,
191                                struct ib_mad *mad)
192 {
193         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
194              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
195             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
196             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
197                 spin_lock(&to_mdev(dev)->sm_lock);
198                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
199                 spin_unlock(&to_mdev(dev)->sm_lock);
200         }
201 }
202
203 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
204 {
205         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
206         struct ib_mad_send_buf *send_buf;
207         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
208         int ret;
209
210         if (agent) {
211                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
212                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
213                 /*
214                  * We rely here on the fact that MLX QPs don't use the
215                  * address handle after the send is posted (this is
216                  * wrong following the IB spec strictly, but we know
217                  * it's OK for our devices).
218                  */
219                 spin_lock(&dev->sm_lock);
220                 memcpy(send_buf->mad, mad, sizeof *mad);
221                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
222                         ret = ib_post_send_mad(send_buf, NULL);
223                 else
224                         ret = -EINVAL;
225                 spin_unlock(&dev->sm_lock);
226
227                 if (ret)
228                         ib_free_send_mad(send_buf);
229         }
230 }
231
232 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
233                         struct ib_wc *in_wc, struct ib_grh *in_grh,
234                         struct ib_mad *in_mad, struct ib_mad *out_mad)
235 {
236         u16 slid, prev_lid = 0;
237         int err;
238         struct ib_port_attr pattr;
239
240         slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
241
242         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
243                 forward_trap(to_mdev(ibdev), port_num, in_mad);
244                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
245         }
246
247         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
248             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
249                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
250                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
251                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
252                         return IB_MAD_RESULT_SUCCESS;
253
254                 /*
255                  * Don't process SMInfo queries or vendor-specific
256                  * MADs -- the SMA can't handle them.
257                  */
258                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
259                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
260                      IB_SMP_ATTR_VENDOR_MASK))
261                         return IB_MAD_RESULT_SUCCESS;
262         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
263                    in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1   ||
264                    in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2   ||
265                    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
266                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
267                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
268                         return IB_MAD_RESULT_SUCCESS;
269         } else
270                 return IB_MAD_RESULT_SUCCESS;
271
272         if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
273              in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
274             in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
275             in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
276             !ib_query_port(ibdev, port_num, &pattr))
277                 prev_lid = pattr.lid;
278
279         err = mlx4_MAD_IFC(to_mdev(ibdev),
280                            mad_flags & IB_MAD_IGNORE_MKEY,
281                            mad_flags & IB_MAD_IGNORE_BKEY,
282                            port_num, in_wc, in_grh, in_mad, out_mad);
283         if (err)
284                 return IB_MAD_RESULT_FAILURE;
285
286         if (!out_mad->mad_hdr.status) {
287                 smp_snoop(ibdev, port_num, in_mad, prev_lid);
288                 node_desc_override(ibdev, out_mad);
289         }
290
291         /* set return bit in status of directed route responses */
292         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
293                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
294
295         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
296                 /* no response for trap repress */
297                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
298
299         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
300 }
301
302 static void send_handler(struct ib_mad_agent *agent,
303                          struct ib_mad_send_wc *mad_send_wc)
304 {
305         ib_free_send_mad(mad_send_wc->send_buf);
306 }
307
308 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
309 {
310         struct ib_mad_agent *agent;
311         int p, q;
312         int ret;
313
314         for (p = 0; p < dev->num_ports; ++p)
315                 for (q = 0; q <= 1; ++q) {
316                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
317                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
318                                                       NULL, 0, send_handler,
319                                                       NULL, NULL);
320                         if (IS_ERR(agent)) {
321                                 ret = PTR_ERR(agent);
322                                 goto err;
323                         }
324                         dev->send_agent[p][q] = agent;
325                 }
326
327         return 0;
328
329 err:
330         for (p = 0; p < dev->num_ports; ++p)
331                 for (q = 0; q <= 1; ++q)
332                         if (dev->send_agent[p][q])
333                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
334
335         return ret;
336 }
337
338 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
339 {
340         struct ib_mad_agent *agent;
341         int p, q;
342
343         for (p = 0; p < dev->num_ports; ++p) {
344                 for (q = 0; q <= 1; ++q) {
345                         agent = dev->send_agent[p][q];
346                         dev->send_agent[p][q] = NULL;
347                         ib_unregister_mad_agent(agent);
348                 }
349
350                 if (dev->sm_ah[p])
351                         ib_destroy_ah(dev->sm_ah[p]);
352         }
353 }