1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <linux/string.h>
36 #include <linux/slab.h>
37
38 #include <rdma/ib_verbs.h>
39 #include <rdma/ib_mad.h>
40 #include <rdma/ib_smi.h>
41
42 #include "mthca_dev.h"
43 #include "mthca_cmd.h"
44
45 enum {
46 MTHCA_VENDOR_CLASS1 = 0x9,
47 MTHCA_VENDOR_CLASS2 = 0xa
48 };
49
mthca_update_rate(struct mthca_dev * dev,u8 port_num)50 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
51 {
52 struct ib_port_attr *tprops = NULL;
53 int ret;
54
55 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
56 if (!tprops)
57 return -ENOMEM;
58
59 ret = ib_query_port(&dev->ib_dev, port_num, tprops);
60 if (ret) {
61 dev_warn(&dev->ib_dev.dev,
62 "ib_query_port failed (%d) forport %d\n", ret,
63 port_num);
64 goto out;
65 }
66
67 dev->rate[port_num - 1] = tprops->active_speed *
68 ib_width_enum_to_int(tprops->active_width);
69
70 out:
71 kfree(tprops);
72 return ret;
73 }
74
update_sm_ah(struct mthca_dev * dev,u8 port_num,u16 lid,u8 sl)75 static void update_sm_ah(struct mthca_dev *dev,
76 u8 port_num, u16 lid, u8 sl)
77 {
78 struct ib_ah *new_ah;
79 struct rdma_ah_attr ah_attr;
80 unsigned long flags;
81
82 if (!dev->send_agent[port_num - 1][0])
83 return;
84
85 memset(&ah_attr, 0, sizeof ah_attr);
86 ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
87 rdma_ah_set_dlid(&ah_attr, lid);
88 rdma_ah_set_sl(&ah_attr, sl);
89 rdma_ah_set_port_num(&ah_attr, port_num);
90
91 new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
92 &ah_attr, 0);
93 if (IS_ERR(new_ah))
94 return;
95
96 spin_lock_irqsave(&dev->sm_lock, flags);
97 if (dev->sm_ah[port_num - 1])
98 rdma_destroy_ah(dev->sm_ah[port_num - 1], 0);
99 dev->sm_ah[port_num - 1] = new_ah;
100 spin_unlock_irqrestore(&dev->sm_lock, flags);
101 }
102
103 /*
104 * Snoop SM MADs for port info and P_Key table sets, so we can
105 * synthesize LID change and P_Key change events.
106 */
smp_snoop(struct ib_device * ibdev,u8 port_num,const struct ib_mad * mad,u16 prev_lid)107 static void smp_snoop(struct ib_device *ibdev,
108 u8 port_num,
109 const struct ib_mad *mad,
110 u16 prev_lid)
111 {
112 struct ib_event event;
113
114 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
115 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
116 mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
117 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
118 struct ib_port_info *pinfo =
119 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
120 u16 lid = be16_to_cpu(pinfo->lid);
121
122 mthca_update_rate(to_mdev(ibdev), port_num);
123 update_sm_ah(to_mdev(ibdev), port_num,
124 be16_to_cpu(pinfo->sm_lid),
125 pinfo->neighbormtu_mastersmsl & 0xf);
126
127 event.device = ibdev;
128 event.element.port_num = port_num;
129
130 if (pinfo->clientrereg_resv_subnetto & 0x80) {
131 event.event = IB_EVENT_CLIENT_REREGISTER;
132 ib_dispatch_event(&event);
133 }
134
135 if (prev_lid != lid) {
136 event.event = IB_EVENT_LID_CHANGE;
137 ib_dispatch_event(&event);
138 }
139 }
140
141 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
142 event.device = ibdev;
143 event.event = IB_EVENT_PKEY_CHANGE;
144 event.element.port_num = port_num;
145 ib_dispatch_event(&event);
146 }
147 }
148 }
149
node_desc_override(struct ib_device * dev,struct ib_mad * mad)150 static void node_desc_override(struct ib_device *dev,
151 struct ib_mad *mad)
152 {
153 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
154 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
155 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
156 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
157 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
158 memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
159 IB_DEVICE_NODE_DESC_MAX);
160 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
161 }
162 }
163
forward_trap(struct mthca_dev * dev,u32 port_num,const struct ib_mad * mad)164 static void forward_trap(struct mthca_dev *dev,
165 u32 port_num,
166 const struct ib_mad *mad)
167 {
168 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
169 struct ib_mad_send_buf *send_buf;
170 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
171 int ret;
172 unsigned long flags;
173
174 if (agent) {
175 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
176 IB_MGMT_MAD_DATA, GFP_ATOMIC,
177 IB_MGMT_BASE_VERSION);
178 if (IS_ERR(send_buf))
179 return;
180 /*
181 * We rely here on the fact that MLX QPs don't use the
182 * address handle after the send is posted (this is
183 * wrong following the IB spec strictly, but we know
184 * it's OK for our devices).
185 */
186 spin_lock_irqsave(&dev->sm_lock, flags);
187 memcpy(send_buf->mad, mad, sizeof *mad);
188 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
189 ret = ib_post_send_mad(send_buf, NULL);
190 else
191 ret = -EINVAL;
192 spin_unlock_irqrestore(&dev->sm_lock, flags);
193
194 if (ret)
195 ib_free_send_mad(send_buf);
196 }
197 }
198
mthca_process_mad(struct ib_device * ibdev,int mad_flags,u32 port_num,const struct ib_wc * in_wc,const struct ib_grh * in_grh,const struct ib_mad * in,struct ib_mad * out,size_t * out_mad_size,u16 * out_mad_pkey_index)199 int mthca_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,
200 const struct ib_wc *in_wc, const struct ib_grh *in_grh,
201 const struct ib_mad *in, struct ib_mad *out,
202 size_t *out_mad_size, u16 *out_mad_pkey_index)
203 {
204 int err;
205 u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
206 u16 prev_lid = 0;
207 struct ib_port_attr pattr;
208
209 /* Forward locally generated traps to the SM */
210 if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP && !slid) {
211 forward_trap(to_mdev(ibdev), port_num, in);
212 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
213 }
214
215 /*
216 * Only handle SM gets, sets and trap represses for SM class
217 *
218 * Only handle PMA and Mellanox vendor-specific class gets and
219 * sets for other classes.
220 */
221 if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
222 in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
223 if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
224 in->mad_hdr.method != IB_MGMT_METHOD_SET &&
225 in->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
226 return IB_MAD_RESULT_SUCCESS;
227
228 /*
229 * Don't process SMInfo queries or vendor-specific
230 * MADs -- the SMA can't handle them.
231 */
232 if (in->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
233 ((in->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
234 IB_SMP_ATTR_VENDOR_MASK))
235 return IB_MAD_RESULT_SUCCESS;
236 } else if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
237 in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
238 in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
239 if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
240 in->mad_hdr.method != IB_MGMT_METHOD_SET)
241 return IB_MAD_RESULT_SUCCESS;
242 } else
243 return IB_MAD_RESULT_SUCCESS;
244 if ((in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
245 in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
246 in->mad_hdr.method == IB_MGMT_METHOD_SET &&
247 in->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
248 !ib_query_port(ibdev, port_num, &pattr))
249 prev_lid = ib_lid_cpu16(pattr.lid);
250
251 err = mthca_MAD_IFC(to_mdev(ibdev), mad_flags & IB_MAD_IGNORE_MKEY,
252 mad_flags & IB_MAD_IGNORE_BKEY, port_num, in_wc,
253 in_grh, in, out);
254 if (err == -EBADMSG)
255 return IB_MAD_RESULT_SUCCESS;
256 else if (err) {
257 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
258 return IB_MAD_RESULT_FAILURE;
259 }
260
261 if (!out->mad_hdr.status) {
262 smp_snoop(ibdev, port_num, in, prev_lid);
263 node_desc_override(ibdev, out);
264 }
265
266 /* set return bit in status of directed route responses */
267 if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
268 out->mad_hdr.status |= cpu_to_be16(1 << 15);
269
270 if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
271 /* no response for trap repress */
272 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
273
274 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
275 }
276
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)277 static void send_handler(struct ib_mad_agent *agent,
278 struct ib_mad_send_wc *mad_send_wc)
279 {
280 ib_free_send_mad(mad_send_wc->send_buf);
281 }
282
mthca_create_agents(struct mthca_dev * dev)283 int mthca_create_agents(struct mthca_dev *dev)
284 {
285 struct ib_mad_agent *agent;
286 int p, q;
287 int ret;
288
289 spin_lock_init(&dev->sm_lock);
290
291 for (p = 0; p < dev->limits.num_ports; ++p)
292 for (q = 0; q <= 1; ++q) {
293 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
294 q ? IB_QPT_GSI : IB_QPT_SMI,
295 NULL, 0, send_handler,
296 NULL, NULL, 0);
297 if (IS_ERR(agent)) {
298 ret = PTR_ERR(agent);
299 goto err;
300 }
301 dev->send_agent[p][q] = agent;
302 }
303
304
305 for (p = 1; p <= dev->limits.num_ports; ++p) {
306 ret = mthca_update_rate(dev, p);
307 if (ret) {
308 mthca_err(dev, "Failed to obtain port %d rate."
309 " aborting.\n", p);
310 goto err;
311 }
312 }
313
314 return 0;
315
316 err:
317 for (p = 0; p < dev->limits.num_ports; ++p)
318 for (q = 0; q <= 1; ++q)
319 if (dev->send_agent[p][q])
320 ib_unregister_mad_agent(dev->send_agent[p][q]);
321
322 return ret;
323 }
324
mthca_free_agents(struct mthca_dev * dev)325 void mthca_free_agents(struct mthca_dev *dev)
326 {
327 struct ib_mad_agent *agent;
328 int p, q;
329
330 for (p = 0; p < dev->limits.num_ports; ++p) {
331 for (q = 0; q <= 1; ++q) {
332 agent = dev->send_agent[p][q];
333 dev->send_agent[p][q] = NULL;
334 ib_unregister_mad_agent(agent);
335 }
336
337 if (dev->sm_ah[p])
338 rdma_destroy_ah(dev->sm_ah[p],
339 RDMA_DESTROY_AH_SLEEPABLE);
340 }
341 }
342