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 
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 
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  */
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 
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 
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 
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 
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 
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 
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