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		      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, 64);
157		mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
158	}
159}
160
161static void forward_trap(struct mthca_dev *dev,
162			 u8 port_num,
163			 struct ib_mad *mad)
164{
165	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
166	struct ib_mad_send_buf *send_buf;
167	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
168	int ret;
169	unsigned long flags;
170
171	if (agent) {
172		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
173					      IB_MGMT_MAD_DATA, GFP_ATOMIC);
174		if (IS_ERR(send_buf))
175			return;
176		/*
177		 * We rely here on the fact that MLX QPs don't use the
178		 * address handle after the send is posted (this is
179		 * wrong following the IB spec strictly, but we know
180		 * it's OK for our devices).
181		 */
182		spin_lock_irqsave(&dev->sm_lock, flags);
183		memcpy(send_buf->mad, mad, sizeof *mad);
184		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
185			ret = ib_post_send_mad(send_buf, NULL);
186		else
187			ret = -EINVAL;
188		spin_unlock_irqrestore(&dev->sm_lock, flags);
189
190		if (ret)
191			ib_free_send_mad(send_buf);
192	}
193}
194
195int mthca_process_mad(struct ib_device *ibdev,
196		      int mad_flags,
197		      u8 port_num,
198		      struct ib_wc *in_wc,
199		      struct ib_grh *in_grh,
200		      struct ib_mad *in_mad,
201		      struct ib_mad *out_mad)
202{
203	int err;
204	u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
205	u16 prev_lid = 0;
206	struct ib_port_attr pattr;
207
208	/* Forward locally generated traps to the SM */
209	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
210	    slid == 0) {
211		forward_trap(to_mdev(ibdev), port_num, in_mad);
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->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
222	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
223		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
224		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
225		    in_mad->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->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
233		    ((in_mad->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->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
237		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
238		   in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
239		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
240		    in_mad->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->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
245	     in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
246	    in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
247	    in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
248	    !ib_query_port(ibdev, port_num, &pattr))
249		prev_lid = pattr.lid;
250
251	err = mthca_MAD_IFC(to_mdev(ibdev),
252			    mad_flags & IB_MAD_IGNORE_MKEY,
253			    mad_flags & IB_MAD_IGNORE_BKEY,
254			    port_num, in_wc, in_grh, in_mad, out_mad);
255	if (err == -EBADMSG)
256		return IB_MAD_RESULT_SUCCESS;
257	else if (err) {
258		mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
259		return IB_MAD_RESULT_FAILURE;
260	}
261
262	if (!out_mad->mad_hdr.status) {
263		smp_snoop(ibdev, port_num, in_mad, prev_lid);
264		node_desc_override(ibdev, out_mad);
265	}
266
267	/* set return bit in status of directed route responses */
268	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
269		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
270
271	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
272		/* no response for trap repress */
273		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
274
275	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
276}
277
278static void send_handler(struct ib_mad_agent *agent,
279			 struct ib_mad_send_wc *mad_send_wc)
280{
281	ib_free_send_mad(mad_send_wc->send_buf);
282}
283
284int mthca_create_agents(struct mthca_dev *dev)
285{
286	struct ib_mad_agent *agent;
287	int p, q;
288	int ret;
289
290	spin_lock_init(&dev->sm_lock);
291
292	for (p = 0; p < dev->limits.num_ports; ++p)
293		for (q = 0; q <= 1; ++q) {
294			agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
295						      q ? IB_QPT_GSI : IB_QPT_SMI,
296						      NULL, 0, send_handler,
297						      NULL, NULL, 0);
298			if (IS_ERR(agent)) {
299				ret = PTR_ERR(agent);
300				goto err;
301			}
302			dev->send_agent[p][q] = agent;
303		}
304
305
306	for (p = 1; p <= dev->limits.num_ports; ++p) {
307		ret = mthca_update_rate(dev, p);
308		if (ret) {
309			mthca_err(dev, "Failed to obtain port %d rate."
310				  " aborting.\n", p);
311			goto err;
312		}
313	}
314
315	return 0;
316
317err:
318	for (p = 0; p < dev->limits.num_ports; ++p)
319		for (q = 0; q <= 1; ++q)
320			if (dev->send_agent[p][q])
321				ib_unregister_mad_agent(dev->send_agent[p][q]);
322
323	return ret;
324}
325
326void mthca_free_agents(struct mthca_dev *dev)
327{
328	struct ib_mad_agent *agent;
329	int p, q;
330
331	for (p = 0; p < dev->limits.num_ports; ++p) {
332		for (q = 0; q <= 1; ++q) {
333			agent = dev->send_agent[p][q];
334			dev->send_agent[p][q] = NULL;
335			ib_unregister_mad_agent(agent);
336		}
337
338		if (dev->sm_ah[p])
339			ib_destroy_ah(dev->sm_ah[p]);
340	}
341}
342