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 * $Id: mthca_mad.c,v 1.1.1.1 2007/08/03 18:52:32 Exp $
35 */
36
37#include <linux/string.h>
38#include <linux/slab.h>
39
40#include <rdma/ib_verbs.h>
41#include <rdma/ib_mad.h>
42#include <rdma/ib_smi.h>
43
44#include "mthca_dev.h"
45#include "mthca_cmd.h"
46
47enum {
48	MTHCA_VENDOR_CLASS1 = 0x9,
49	MTHCA_VENDOR_CLASS2 = 0xa
50};
51
52static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
53{
54	struct ib_port_attr *tprops = NULL;
55	int                  ret;
56
57	tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
58	if (!tprops)
59		return -ENOMEM;
60
61	ret = ib_query_port(&dev->ib_dev, port_num, tprops);
62	if (ret) {
63		printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
64		       ret, dev->ib_dev.name, port_num);
65		goto out;
66	}
67
68	dev->rate[port_num - 1] = tprops->active_speed *
69				  ib_width_enum_to_int(tprops->active_width);
70
71out:
72	kfree(tprops);
73	return ret;
74}
75
76static void update_sm_ah(struct mthca_dev *dev,
77			 u8 port_num, u16 lid, u8 sl)
78{
79	struct ib_ah *new_ah;
80	struct ib_ah_attr ah_attr;
81	unsigned long flags;
82
83	if (!dev->send_agent[port_num - 1][0])
84		return;
85
86	memset(&ah_attr, 0, sizeof ah_attr);
87	ah_attr.dlid     = lid;
88	ah_attr.sl       = sl;
89	ah_attr.port_num = port_num;
90
91	new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
92			      &ah_attr);
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		ib_destroy_ah(dev->sm_ah[port_num - 1]);
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 */
107static void smp_snoop(struct ib_device *ibdev,
108		      u8 port_num,
109		      struct ib_mad *mad)
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
120			mthca_update_rate(to_mdev(ibdev), port_num);
121			update_sm_ah(to_mdev(ibdev), port_num,
122				     be16_to_cpu(pinfo->sm_lid),
123				     pinfo->neighbormtu_mastersmsl & 0xf);
124
125			event.device           = ibdev;
126			event.element.port_num = port_num;
127
128			if(pinfo->clientrereg_resv_subnetto & 0x80)
129				event.event    = IB_EVENT_CLIENT_REREGISTER;
130			else
131				event.event    = IB_EVENT_LID_CHANGE;
132
133			ib_dispatch_event(&event);
134		}
135
136		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
137			event.device           = ibdev;
138			event.event            = IB_EVENT_PKEY_CHANGE;
139			event.element.port_num = port_num;
140			ib_dispatch_event(&event);
141		}
142	}
143}
144
145static void node_desc_override(struct ib_device *dev,
146			       struct ib_mad *mad)
147{
148	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
149	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
150	    mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
151	    mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
152		mutex_lock(&to_mdev(dev)->cap_mask_mutex);
153		memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
154		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
155	}
156}
157
158static void forward_trap(struct mthca_dev *dev,
159			 u8 port_num,
160			 struct ib_mad *mad)
161{
162	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
163	struct ib_mad_send_buf *send_buf;
164	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
165	int ret;
166	unsigned long flags;
167
168	if (agent) {
169		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
170					      IB_MGMT_MAD_DATA, GFP_ATOMIC);
171		/*
172		 * We rely here on the fact that MLX QPs don't use the
173		 * address handle after the send is posted (this is
174		 * wrong following the IB spec strictly, but we know
175		 * it's OK for our devices).
176		 */
177		spin_lock_irqsave(&dev->sm_lock, flags);
178		memcpy(send_buf->mad, mad, sizeof *mad);
179		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
180			ret = ib_post_send_mad(send_buf, NULL);
181		else
182			ret = -EINVAL;
183		spin_unlock_irqrestore(&dev->sm_lock, flags);
184
185		if (ret)
186			ib_free_send_mad(send_buf);
187	}
188}
189
190int mthca_process_mad(struct ib_device *ibdev,
191		      int mad_flags,
192		      u8 port_num,
193		      struct ib_wc *in_wc,
194		      struct ib_grh *in_grh,
195		      struct ib_mad *in_mad,
196		      struct ib_mad *out_mad)
197{
198	int err;
199	u8 status;
200	u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
201
202	/* Forward locally generated traps to the SM */
203	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
204	    slid == 0) {
205		forward_trap(to_mdev(ibdev), port_num, in_mad);
206		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
207	}
208
209	/*
210	 * Only handle SM gets, sets and trap represses for SM class
211	 *
212	 * Only handle PMA and Mellanox vendor-specific class gets and
213	 * sets for other classes.
214	 */
215	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
216	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
217		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
218		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
219		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
220			return IB_MAD_RESULT_SUCCESS;
221
222		/*
223		 * Don't process SMInfo queries or vendor-specific
224		 * MADs -- the SMA can't handle them.
225		 */
226		if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
227		    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
228		     IB_SMP_ATTR_VENDOR_MASK))
229			return IB_MAD_RESULT_SUCCESS;
230	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
231		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
232		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
233		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
234		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
235			return IB_MAD_RESULT_SUCCESS;
236	} else
237		return IB_MAD_RESULT_SUCCESS;
238
239	err = mthca_MAD_IFC(to_mdev(ibdev),
240			    mad_flags & IB_MAD_IGNORE_MKEY,
241			    mad_flags & IB_MAD_IGNORE_BKEY,
242			    port_num, in_wc, in_grh, in_mad, out_mad,
243			    &status);
244	if (err) {
245		mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
246		return IB_MAD_RESULT_FAILURE;
247	}
248	if (status == MTHCA_CMD_STAT_BAD_PKT)
249		return IB_MAD_RESULT_SUCCESS;
250	if (status) {
251		mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
252			  status);
253		return IB_MAD_RESULT_FAILURE;
254	}
255
256	if (!out_mad->mad_hdr.status) {
257		smp_snoop(ibdev, port_num, in_mad);
258		node_desc_override(ibdev, out_mad);
259	}
260
261	/* set return bit in status of directed route responses */
262	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
263		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
264
265	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
266		/* no response for trap repress */
267		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
268
269	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
270}
271
272static void send_handler(struct ib_mad_agent *agent,
273			 struct ib_mad_send_wc *mad_send_wc)
274{
275	ib_free_send_mad(mad_send_wc->send_buf);
276}
277
278int mthca_create_agents(struct mthca_dev *dev)
279{
280	struct ib_mad_agent *agent;
281	int p, q;
282	int ret;
283
284	spin_lock_init(&dev->sm_lock);
285
286	for (p = 0; p < dev->limits.num_ports; ++p)
287		for (q = 0; q <= 1; ++q) {
288			agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
289						      q ? IB_QPT_GSI : IB_QPT_SMI,
290						      NULL, 0, send_handler,
291						      NULL, NULL);
292			if (IS_ERR(agent)) {
293				ret = PTR_ERR(agent);
294				goto err;
295			}
296			dev->send_agent[p][q] = agent;
297		}
298
299
300	for (p = 1; p <= dev->limits.num_ports; ++p) {
301		ret = mthca_update_rate(dev, p);
302		if (ret) {
303			mthca_err(dev, "Failed to obtain port %d rate."
304				  " aborting.\n", p);
305			goto err;
306		}
307	}
308
309	return 0;
310
311err:
312	for (p = 0; p < dev->limits.num_ports; ++p)
313		for (q = 0; q <= 1; ++q)
314			if (dev->send_agent[p][q])
315				ib_unregister_mad_agent(dev->send_agent[p][q]);
316
317	return ret;
318}
319
320void mthca_free_agents(struct mthca_dev *dev)
321{
322	struct ib_mad_agent *agent;
323	int p, q;
324
325	for (p = 0; p < dev->limits.num_ports; ++p) {
326		for (q = 0; q <= 1; ++q) {
327			agent = dev->send_agent[p][q];
328			dev->send_agent[p][q] = NULL;
329			ib_unregister_mad_agent(agent);
330		}
331
332		if (dev->sm_ah[p])
333			ib_destroy_ah(dev->sm_ah[p]);
334	}
335}
336