1 /*
2 * Copyright(c) 2016 Intel Corporation.
3 *
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
6 *
7 * GPL LICENSE SUMMARY
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47
48 #include <rdma/ib_mad.h>
49 #include "mad.h"
50 #include "vt.h"
51
52 /**
53 * rvt_process_mad - process an incoming MAD packet
54 * @ibdev: the infiniband device this packet came in on
55 * @mad_flags: MAD flags
56 * @port_num: the port number this packet came in on, 1 based from ib core
57 * @in_wc: the work completion entry for this packet
58 * @in_grh: the global route header for this packet
59 * @in_mad: the incoming MAD
60 * @out_mad: any outgoing MAD reply
61 *
62 * Note that the verbs framework has already done the MAD sanity checks,
63 * and hop count/pointer updating for IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
64 * MADs.
65 *
66 * This is called by the ib_mad module.
67 *
68 * Return: IB_MAD_RESULT_SUCCESS or error
69 */
70 int rvt_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
71 const struct ib_wc *in_wc, const struct ib_grh *in_grh,
72 const struct ib_mad_hdr *in, size_t in_mad_size,
73 struct ib_mad_hdr *out, size_t *out_mad_size,
74 u16 *out_mad_pkey_index)
75 {
76 /*
77 * MAD processing is quite different between hfi1 and qib. Therefore
78 * this is expected to be provided by the driver. Other drivers in the
79 * future may choose to implement this but it should not be made into a
80 * requirement.
81 */
82 if (ibport_num_to_idx(ibdev, port_num) < 0)
83 return -EINVAL;
84
85 return IB_MAD_RESULT_FAILURE;
86 }
87
88 static void rvt_send_mad_handler(struct ib_mad_agent *agent,
89 struct ib_mad_send_wc *mad_send_wc)
90 {
91 ib_free_send_mad(mad_send_wc->send_buf);
92 }
93
94 /**
95 * rvt_create_mad_agents - create mad agents
96 * @rdi: rvt dev struct
97 *
98 * If driver needs to be notified of mad agent creation then call back
99 *
100 * Return 0 on success
101 */
102 int rvt_create_mad_agents(struct rvt_dev_info *rdi)
103 {
104 struct ib_mad_agent *agent;
105 struct rvt_ibport *rvp;
106 int p;
107 int ret;
108
109 for (p = 0; p < rdi->dparms.nports; p++) {
110 rvp = rdi->ports[p];
111 agent = ib_register_mad_agent(&rdi->ibdev, p + 1,
112 IB_QPT_SMI,
113 NULL, 0, rvt_send_mad_handler,
114 NULL, NULL, 0);
115 if (IS_ERR(agent)) {
116 ret = PTR_ERR(agent);
117 goto err;
118 }
119
120 rvp->send_agent = agent;
121
122 if (rdi->driver_f.notify_create_mad_agent)
123 rdi->driver_f.notify_create_mad_agent(rdi, p);
124 }
125
126 return 0;
127
128 err:
129 for (p = 0; p < rdi->dparms.nports; p++) {
130 rvp = rdi->ports[p];
131 if (rvp->send_agent) {
132 agent = rvp->send_agent;
133 rvp->send_agent = NULL;
134 ib_unregister_mad_agent(agent);
135 if (rdi->driver_f.notify_free_mad_agent)
136 rdi->driver_f.notify_free_mad_agent(rdi, p);
137 }
138 }
139
140 return ret;
141 }
142
143 /**
144 * rvt_free_mad_agents - free up mad agents
145 * @rdi: rvt dev struct
146 *
147 * If driver needs notification of mad agent removal make the call back
148 */
149 void rvt_free_mad_agents(struct rvt_dev_info *rdi)
150 {
151 struct ib_mad_agent *agent;
152 struct rvt_ibport *rvp;
153 int p;
154
155 for (p = 0; p < rdi->dparms.nports; p++) {
156 rvp = rdi->ports[p];
157 if (rvp->send_agent) {
158 agent = rvp->send_agent;
159 rvp->send_agent = NULL;
160 ib_unregister_mad_agent(agent);
161 }
162 if (rvp->sm_ah) {
163 rdma_destroy_ah(&rvp->sm_ah->ibah,
164 RDMA_DESTROY_AH_SLEEPABLE);
165 rvp->sm_ah = NULL;
166 }
167
168 if (rdi->driver_f.notify_free_mad_agent)
169 rdi->driver_f.notify_free_mad_agent(rdi, p);
170 }
171 }
172