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
45enum {
46	MTHCA_VENDOR_CLASS1 = 0x9,
47	MTHCA_VENDOR_CLASS2 = 0xa
48};
49
50static 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
69out:
70	kfree(tprops);
71	return ret;
72}
73
74static 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 ib_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.dlid     = lid;
86	ah_attr.sl       = sl;
87	ah_attr.port_num = port_num;
88
89	new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
90			      &ah_attr);
91	if (IS_ERR(new_ah))
92		return;
93
94	spin_lock_irqsave(&dev->sm_lock, flags);
95	if (dev->sm_ah[port_num - 1])
96		ib_destroy_ah(dev->sm_ah[port_num - 1]);
97	dev->sm_ah[port_num - 1] = new_ah;
98	spin_unlock_irqrestore(&dev->sm_lock, flags);
99}
100
101/*
102 * Snoop SM MADs for port info and P_Key table sets, so we can
103 * synthesize LID change and P_Key change events.
104 */
105static void smp_snoop(struct ib_device *ibdev,
106		      u8 port_num,
107		      const struct ib_mad *mad,
108		      u16 prev_lid)
109{
110	struct ib_event event;
111
112	if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
113	     mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
114	    mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
115		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
116			struct ib_port_info *pinfo =
117				(struct ib_port_info *) ((struct ib_smp *) mad)->data;
118			u16 lid = be16_to_cpu(pinfo->lid);
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				ib_dispatch_event(&event);
131			}
132
133			if (prev_lid != lid) {
134				event.event    = IB_EVENT_LID_CHANGE;
135				ib_dispatch_event(&event);
136			}
137		}
138
139		if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
140			event.device           = ibdev;
141			event.event            = IB_EVENT_PKEY_CHANGE;
142			event.element.port_num = port_num;
143			ib_dispatch_event(&event);
144		}
145	}
146}
147
148static void node_desc_override(struct ib_device *dev,
149			       struct ib_mad *mad)
150{
151	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
152	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
153	    mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
154	    mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
155		mutex_lock(&to_mdev(dev)->cap_mask_mutex);
156		memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
157		       IB_DEVICE_NODE_DESC_MAX);
158		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
159	}
160}
161
162static void forward_trap(struct mthca_dev *dev,
163			 u8 port_num,
164			 const struct ib_mad *mad)
165{
166	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
167	struct ib_mad_send_buf *send_buf;
168	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
169	int ret;
170	unsigned long flags;
171
172	if (agent) {
173		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
174					      IB_MGMT_MAD_DATA, GFP_ATOMIC,
175					      IB_MGMT_BASE_VERSION);
176		if (IS_ERR(send_buf))
177			return;
178		/*
179		 * We rely here on the fact that MLX QPs don't use the
180		 * address handle after the send is posted (this is
181		 * wrong following the IB spec strictly, but we know
182		 * it's OK for our devices).
183		 */
184		spin_lock_irqsave(&dev->sm_lock, flags);
185		memcpy(send_buf->mad, mad, sizeof *mad);
186		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
187			ret = ib_post_send_mad(send_buf, NULL);
188		else
189			ret = -EINVAL;
190		spin_unlock_irqrestore(&dev->sm_lock, flags);
191
192		if (ret)
193			ib_free_send_mad(send_buf);
194	}
195}
196
197int mthca_process_mad(struct ib_device *ibdev,
198		      int mad_flags,
199		      u8 port_num,
200		      const struct ib_wc *in_wc,
201		      const struct ib_grh *in_grh,
202		      const struct ib_mad_hdr *in, size_t in_mad_size,
203		      struct ib_mad_hdr *out, size_t *out_mad_size,
204		      u16 *out_mad_pkey_index)
205{
206	int err;
207	u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
208	u16 prev_lid = 0;
209	struct ib_port_attr pattr;
210	const struct ib_mad *in_mad = (const struct ib_mad *)in;
211	struct ib_mad *out_mad = (struct ib_mad *)out;
212
213	if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
214			 *out_mad_size != sizeof(*out_mad)))
215		return IB_MAD_RESULT_FAILURE;
216
217	/* Forward locally generated traps to the SM */
218	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
219	    slid == 0) {
220		forward_trap(to_mdev(ibdev), port_num, in_mad);
221		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
222	}
223
224	/*
225	 * Only handle SM gets, sets and trap represses for SM class
226	 *
227	 * Only handle PMA and Mellanox vendor-specific class gets and
228	 * sets for other classes.
229	 */
230	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
231	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
232		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
233		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
234		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
235			return IB_MAD_RESULT_SUCCESS;
236
237		/*
238		 * Don't process SMInfo queries or vendor-specific
239		 * MADs -- the SMA can't handle them.
240		 */
241		if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
242		    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
243		     IB_SMP_ATTR_VENDOR_MASK))
244			return IB_MAD_RESULT_SUCCESS;
245	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
246		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
247		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
248		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
249		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
250			return IB_MAD_RESULT_SUCCESS;
251	} else
252		return IB_MAD_RESULT_SUCCESS;
253	if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
254	     in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
255	    in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
256	    in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
257	    !ib_query_port(ibdev, port_num, &pattr))
258		prev_lid = pattr.lid;
259
260	err = mthca_MAD_IFC(to_mdev(ibdev),
261			    mad_flags & IB_MAD_IGNORE_MKEY,
262			    mad_flags & IB_MAD_IGNORE_BKEY,
263			    port_num, in_wc, in_grh, in_mad, out_mad);
264	if (err == -EBADMSG)
265		return IB_MAD_RESULT_SUCCESS;
266	else if (err) {
267		mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
268		return IB_MAD_RESULT_FAILURE;
269	}
270
271	if (!out_mad->mad_hdr.status) {
272		smp_snoop(ibdev, port_num, in_mad, prev_lid);
273		node_desc_override(ibdev, out_mad);
274	}
275
276	/* set return bit in status of directed route responses */
277	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
278		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
279
280	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
281		/* no response for trap repress */
282		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
283
284	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
285}
286
287static void send_handler(struct ib_mad_agent *agent,
288			 struct ib_mad_send_wc *mad_send_wc)
289{
290	ib_free_send_mad(mad_send_wc->send_buf);
291}
292
293int mthca_create_agents(struct mthca_dev *dev)
294{
295	struct ib_mad_agent *agent;
296	int p, q;
297	int ret;
298
299	spin_lock_init(&dev->sm_lock);
300
301	for (p = 0; p < dev->limits.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, 0);
307			if (IS_ERR(agent)) {
308				ret = PTR_ERR(agent);
309				goto err;
310			}
311			dev->send_agent[p][q] = agent;
312		}
313
314
315	for (p = 1; p <= dev->limits.num_ports; ++p) {
316		ret = mthca_update_rate(dev, p);
317		if (ret) {
318			mthca_err(dev, "Failed to obtain port %d rate."
319				  " aborting.\n", p);
320			goto err;
321		}
322	}
323
324	return 0;
325
326err:
327	for (p = 0; p < dev->limits.num_ports; ++p)
328		for (q = 0; q <= 1; ++q)
329			if (dev->send_agent[p][q])
330				ib_unregister_mad_agent(dev->send_agent[p][q]);
331
332	return ret;
333}
334
335void mthca_free_agents(struct mthca_dev *dev)
336{
337	struct ib_mad_agent *agent;
338	int p, q;
339
340	for (p = 0; p < dev->limits.num_ports; ++p) {
341		for (q = 0; q <= 1; ++q) {
342			agent = dev->send_agent[p][q];
343			dev->send_agent[p][q] = NULL;
344			ib_unregister_mad_agent(agent);
345		}
346
347		if (dev->sm_ah[p])
348			ib_destroy_ah(dev->sm_ah[p]);
349	}
350}
351