Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / infiniband / sw / rdmavt / mad.c
blobd6981dc04adb0e7ea53be2c145d73dbc8e4e276f
1 /*
2 * Copyright(c) 2016 Intel Corporation.
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.
7 * GPL LICENSE SUMMARY
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.
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.
18 * BSD LICENSE
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
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.
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
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40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 #include <rdma/ib_mad.h>
49 #include "mad.h"
50 #include "vt.h"
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
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.
66 * This is called by the ib_mad module.
68 * Return: IB_MAD_RESULT_SUCCESS or error
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)
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.
82 if (ibport_num_to_idx(ibdev, port_num) < 0)
83 return -EINVAL;
85 return IB_MAD_RESULT_FAILURE;
88 static void rvt_send_mad_handler(struct ib_mad_agent *agent,
89 struct ib_mad_send_wc *mad_send_wc)
91 ib_free_send_mad(mad_send_wc->send_buf);
94 /**
95 * rvt_create_mad_agents - create mad agents
96 * @rdi: rvt dev struct
98 * If driver needs to be notified of mad agent creation then call back
100 * Return 0 on success
102 int rvt_create_mad_agents(struct rvt_dev_info *rdi)
104 struct ib_mad_agent *agent;
105 struct rvt_ibport *rvp;
106 int p;
107 int ret;
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;
120 rvp->send_agent = agent;
122 if (rdi->driver_f.notify_create_mad_agent)
123 rdi->driver_f.notify_create_mad_agent(rdi, p);
126 return 0;
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);
140 return ret;
144 * rvt_free_mad_agents - free up mad agents
145 * @rdi: rvt dev struct
147 * If driver needs notification of mad agent removal make the call back
149 void rvt_free_mad_agents(struct rvt_dev_info *rdi)
151 struct ib_mad_agent *agent;
152 struct rvt_ibport *rvp;
153 int p;
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);
162 if (rvp->sm_ah) {
163 rdma_destroy_ah(&rvp->sm_ah->ibah);
164 rvp->sm_ah = NULL;
167 if (rdi->driver_f.notify_free_mad_agent)
168 rdi->driver_f.notify_free_mad_agent(rdi, p);