xref: /openbmc/linux/drivers/infiniband/hw/mlx4/mad.c (revision 9ac8d3fb)
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 		   in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
260 		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
261 		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
262 			return IB_MAD_RESULT_SUCCESS;
263 	} else
264 		return IB_MAD_RESULT_SUCCESS;
265 
266 	err = mlx4_MAD_IFC(to_mdev(ibdev),
267 			   mad_flags & IB_MAD_IGNORE_MKEY,
268 			   mad_flags & IB_MAD_IGNORE_BKEY,
269 			   port_num, in_wc, in_grh, in_mad, out_mad);
270 	if (err)
271 		return IB_MAD_RESULT_FAILURE;
272 
273 	if (!out_mad->mad_hdr.status) {
274 		smp_snoop(ibdev, port_num, in_mad);
275 		node_desc_override(ibdev, out_mad);
276 	}
277 
278 	/* set return bit in status of directed route responses */
279 	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
280 		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
281 
282 	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
283 		/* no response for trap repress */
284 		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
285 
286 	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
287 }
288 
289 static void send_handler(struct ib_mad_agent *agent,
290 			 struct ib_mad_send_wc *mad_send_wc)
291 {
292 	ib_free_send_mad(mad_send_wc->send_buf);
293 }
294 
295 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
296 {
297 	struct ib_mad_agent *agent;
298 	int p, q;
299 	int ret;
300 
301 	for (p = 0; p < dev->num_ports; ++p)
302 		for (q = 0; q <= 1; ++q) {
303 			agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
304 						      q ? IB_QPT_GSI : IB_QPT_SMI,
305 						      NULL, 0, send_handler,
306 						      NULL, NULL);
307 			if (IS_ERR(agent)) {
308 				ret = PTR_ERR(agent);
309 				goto err;
310 			}
311 			dev->send_agent[p][q] = agent;
312 		}
313 
314 	return 0;
315 
316 err:
317 	for (p = 0; p < dev->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 mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
326 {
327 	struct ib_mad_agent *agent;
328 	int p, q;
329 
330 	for (p = 0; p < dev->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 			ib_destroy_ah(dev->sm_ah[p]);
339 	}
340 }
341