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 		printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
62 		       ret, dev->ib_dev.name, port_num);
63 		goto out;
64 	}
65 
66 	dev->rate[port_num - 1] = tprops->active_speed *
67 				  ib_width_enum_to_int(tprops->active_width);
68 
69 out:
70 	kfree(tprops);
71 	return ret;
72 }
73 
update_sm_ah(struct mthca_dev * dev,u8 port_num,u16 lid,u8 sl)74 static void update_sm_ah(struct mthca_dev *dev,
75 			 u8 port_num, u16 lid, u8 sl)
76 {
77 	struct ib_ah *new_ah;
78 	struct rdma_ah_attr ah_attr;
79 	unsigned long flags;
80 
81 	if (!dev->send_agent[port_num - 1][0])
82 		return;
83 
84 	memset(&ah_attr, 0, sizeof ah_attr);
85 	ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
86 	rdma_ah_set_dlid(&ah_attr, lid);
87 	rdma_ah_set_sl(&ah_attr, sl);
88 	rdma_ah_set_port_num(&ah_attr, port_num);
89 
90 	new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
91 				&ah_attr);
92 	if (IS_ERR(new_ah))
93 		return;
94 
95 	spin_lock_irqsave(&dev->sm_lock, flags);
96 	if (dev->sm_ah[port_num - 1])
97 		rdma_destroy_ah(dev->sm_ah[port_num - 1]);
98 	dev->sm_ah[port_num - 1] = new_ah;
99 	spin_unlock_irqrestore(&dev->sm_lock, flags);
100 }
101 
102 /*
103  * Snoop SM MADs for port info and P_Key table sets, so we can
104  * synthesize LID change and P_Key change events.
105  */
smp_snoop(struct ib_device * ibdev,u8 port_num,const struct ib_mad * mad,u16 prev_lid)106 static void smp_snoop(struct ib_device *ibdev,
107 		      u8 port_num,
108 		      const struct ib_mad *mad,
109 		      u16 prev_lid)
110 {
111 	struct ib_event event;
112 
113 	if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
114 	     mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
115 	    mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
116 		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
117 			struct ib_port_info *pinfo =
118 				(struct ib_port_info *) ((struct ib_smp *) mad)->data;
119 			u16 lid = be16_to_cpu(pinfo->lid);
120 
121 			mthca_update_rate(to_mdev(ibdev), port_num);
122 			update_sm_ah(to_mdev(ibdev), port_num,
123 				     be16_to_cpu(pinfo->sm_lid),
124 				     pinfo->neighbormtu_mastersmsl & 0xf);
125 
126 			event.device           = ibdev;
127 			event.element.port_num = port_num;
128 
129 			if (pinfo->clientrereg_resv_subnetto & 0x80) {
130 				event.event    = IB_EVENT_CLIENT_REREGISTER;
131 				ib_dispatch_event(&event);
132 			}
133 
134 			if (prev_lid != lid) {
135 				event.event    = IB_EVENT_LID_CHANGE;
136 				ib_dispatch_event(&event);
137 			}
138 		}
139 
140 		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
141 			event.device           = ibdev;
142 			event.event            = IB_EVENT_PKEY_CHANGE;
143 			event.element.port_num = port_num;
144 			ib_dispatch_event(&event);
145 		}
146 	}
147 }
148 
node_desc_override(struct ib_device * dev,struct ib_mad * mad)149 static void node_desc_override(struct ib_device *dev,
150 			       struct ib_mad *mad)
151 {
152 	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
153 	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
154 	    mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
155 	    mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
156 		mutex_lock(&to_mdev(dev)->cap_mask_mutex);
157 		memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
158 		       IB_DEVICE_NODE_DESC_MAX);
159 		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
160 	}
161 }
162 
forward_trap(struct mthca_dev * dev,u8 port_num,const struct ib_mad * mad)163 static void forward_trap(struct mthca_dev *dev,
164 			 u8 port_num,
165 			 const struct ib_mad *mad)
166 {
167 	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
168 	struct ib_mad_send_buf *send_buf;
169 	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
170 	int ret;
171 	unsigned long flags;
172 
173 	if (agent) {
174 		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
175 					      IB_MGMT_MAD_DATA, GFP_ATOMIC,
176 					      IB_MGMT_BASE_VERSION);
177 		if (IS_ERR(send_buf))
178 			return;
179 		/*
180 		 * We rely here on the fact that MLX QPs don't use the
181 		 * address handle after the send is posted (this is
182 		 * wrong following the IB spec strictly, but we know
183 		 * it's OK for our devices).
184 		 */
185 		spin_lock_irqsave(&dev->sm_lock, flags);
186 		memcpy(send_buf->mad, mad, sizeof *mad);
187 		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
188 			ret = ib_post_send_mad(send_buf, NULL);
189 		else
190 			ret = -EINVAL;
191 		spin_unlock_irqrestore(&dev->sm_lock, flags);
192 
193 		if (ret)
194 			ib_free_send_mad(send_buf);
195 	}
196 }
197 
mthca_process_mad(struct ib_device * ibdev,int mad_flags,u8 port_num,const struct ib_wc * in_wc,const struct ib_grh * in_grh,const struct ib_mad_hdr * in,size_t in_mad_size,struct ib_mad_hdr * out,size_t * out_mad_size,u16 * out_mad_pkey_index)198 int mthca_process_mad(struct ib_device *ibdev,
199 		      int mad_flags,
200 		      u8 port_num,
201 		      const struct ib_wc *in_wc,
202 		      const struct ib_grh *in_grh,
203 		      const struct ib_mad_hdr *in, size_t in_mad_size,
204 		      struct ib_mad_hdr *out, size_t *out_mad_size,
205 		      u16 *out_mad_pkey_index)
206 {
207 	int err;
208 	u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
209 	u16 prev_lid = 0;
210 	struct ib_port_attr pattr;
211 	const struct ib_mad *in_mad = (const struct ib_mad *)in;
212 	struct ib_mad *out_mad = (struct ib_mad *)out;
213 
214 	if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
215 			 *out_mad_size != sizeof(*out_mad)))
216 		return IB_MAD_RESULT_FAILURE;
217 
218 	/* Forward locally generated traps to the SM */
219 	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
220 	    slid == 0) {
221 		forward_trap(to_mdev(ibdev), port_num, in_mad);
222 		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
223 	}
224 
225 	/*
226 	 * Only handle SM gets, sets and trap represses for SM class
227 	 *
228 	 * Only handle PMA and Mellanox vendor-specific class gets and
229 	 * sets for other classes.
230 	 */
231 	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
232 	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
233 		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
234 		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
235 		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
236 			return IB_MAD_RESULT_SUCCESS;
237 
238 		/*
239 		 * Don't process SMInfo queries or vendor-specific
240 		 * MADs -- the SMA can't handle them.
241 		 */
242 		if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
243 		    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
244 		     IB_SMP_ATTR_VENDOR_MASK))
245 			return IB_MAD_RESULT_SUCCESS;
246 	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
247 		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
248 		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
249 		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
250 		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
251 			return IB_MAD_RESULT_SUCCESS;
252 	} else
253 		return IB_MAD_RESULT_SUCCESS;
254 	if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
255 	     in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
256 	    in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
257 	    in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
258 	    !ib_query_port(ibdev, port_num, &pattr))
259 		prev_lid = ib_lid_cpu16(pattr.lid);
260 
261 	err = mthca_MAD_IFC(to_mdev(ibdev),
262 			    mad_flags & IB_MAD_IGNORE_MKEY,
263 			    mad_flags & IB_MAD_IGNORE_BKEY,
264 			    port_num, in_wc, in_grh, in_mad, out_mad);
265 	if (err == -EBADMSG)
266 		return IB_MAD_RESULT_SUCCESS;
267 	else if (err) {
268 		mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
269 		return IB_MAD_RESULT_FAILURE;
270 	}
271 
272 	if (!out_mad->mad_hdr.status) {
273 		smp_snoop(ibdev, port_num, in_mad, prev_lid);
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 
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)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 
mthca_create_agents(struct mthca_dev * dev)294 int mthca_create_agents(struct mthca_dev *dev)
295 {
296 	struct ib_mad_agent *agent;
297 	int p, q;
298 	int ret;
299 
300 	spin_lock_init(&dev->sm_lock);
301 
302 	for (p = 0; p < dev->limits.num_ports; ++p)
303 		for (q = 0; q <= 1; ++q) {
304 			agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
305 						      q ? IB_QPT_GSI : IB_QPT_SMI,
306 						      NULL, 0, send_handler,
307 						      NULL, NULL, 0);
308 			if (IS_ERR(agent)) {
309 				ret = PTR_ERR(agent);
310 				goto err;
311 			}
312 			dev->send_agent[p][q] = agent;
313 		}
314 
315 
316 	for (p = 1; p <= dev->limits.num_ports; ++p) {
317 		ret = mthca_update_rate(dev, p);
318 		if (ret) {
319 			mthca_err(dev, "Failed to obtain port %d rate."
320 				  " aborting.\n", p);
321 			goto err;
322 		}
323 	}
324 
325 	return 0;
326 
327 err:
328 	for (p = 0; p < dev->limits.num_ports; ++p)
329 		for (q = 0; q <= 1; ++q)
330 			if (dev->send_agent[p][q])
331 				ib_unregister_mad_agent(dev->send_agent[p][q]);
332 
333 	return ret;
334 }
335 
mthca_free_agents(struct mthca_dev * dev)336 void mthca_free_agents(struct mthca_dev *dev)
337 {
338 	struct ib_mad_agent *agent;
339 	int p, q;
340 
341 	for (p = 0; p < dev->limits.num_ports; ++p) {
342 		for (q = 0; q <= 1; ++q) {
343 			agent = dev->send_agent[p][q];
344 			dev->send_agent[p][q] = NULL;
345 			ib_unregister_mad_agent(agent);
346 		}
347 
348 		if (dev->sm_ah[p])
349 			rdma_destroy_ah(dev->sm_ah[p]);
350 	}
351 }
352