1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2016 Intel Corporation.
4 */
5
6#include <rdma/ib_mad.h>
7#include "mad.h"
8#include "vt.h"
9
10/**
11 * rvt_process_mad - process an incoming MAD packet
12 * @ibdev: the infiniband device this packet came in on
13 * @mad_flags: MAD flags
14 * @port_num: the port number this packet came in on, 1 based from ib core
15 * @in_wc: the work completion entry for this packet
16 * @in_grh: the global route header for this packet
17 * @in: the incoming MAD
18 * @in_mad_size: size of the incoming MAD reply
19 * @out: any outgoing MAD reply
20 * @out_mad_size: size of the outgoing MAD reply
21 * @out_mad_pkey_index: unused
22 *
23 * Note that the verbs framework has already done the MAD sanity checks,
24 * and hop count/pointer updating for IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
25 * MADs.
26 *
27 * This is called by the ib_mad module.
28 *
29 * Return: IB_MAD_RESULT_SUCCESS or error
30 */
31int rvt_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,
32 const struct ib_wc *in_wc, const struct ib_grh *in_grh,
33 const struct ib_mad_hdr *in, size_t in_mad_size,
34 struct ib_mad_hdr *out, size_t *out_mad_size,
35 u16 *out_mad_pkey_index)
36{
37 /*
38 * MAD processing is quite different between hfi1 and qib. Therefore
39 * this is expected to be provided by the driver. Other drivers in the
40 * future may choose to implement this but it should not be made into a
41 * requirement.
42 */
43 return IB_MAD_RESULT_FAILURE;
44}
45
46static void rvt_send_mad_handler(struct ib_mad_agent *agent,
47 struct ib_mad_send_wc *mad_send_wc)
48{
49 ib_free_send_mad(send_buf: mad_send_wc->send_buf);
50}
51
52/**
53 * rvt_create_mad_agents - create mad agents
54 * @rdi: rvt dev struct
55 *
56 * If driver needs to be notified of mad agent creation then call back
57 *
58 * Return 0 on success
59 */
60int rvt_create_mad_agents(struct rvt_dev_info *rdi)
61{
62 struct ib_mad_agent *agent;
63 struct rvt_ibport *rvp;
64 int p;
65 int ret;
66
67 for (p = 0; p < rdi->dparms.nports; p++) {
68 rvp = rdi->ports[p];
69 agent = ib_register_mad_agent(device: &rdi->ibdev, port_num: p + 1,
70 qp_type: IB_QPT_SMI,
71 NULL, rmpp_version: 0, send_handler: rvt_send_mad_handler,
72 NULL, NULL, registration_flags: 0);
73 if (IS_ERR(ptr: agent)) {
74 ret = PTR_ERR(ptr: agent);
75 goto err;
76 }
77
78 rvp->send_agent = agent;
79
80 if (rdi->driver_f.notify_create_mad_agent)
81 rdi->driver_f.notify_create_mad_agent(rdi, p);
82 }
83
84 return 0;
85
86err:
87 for (p = 0; p < rdi->dparms.nports; p++) {
88 rvp = rdi->ports[p];
89 if (rvp->send_agent) {
90 agent = rvp->send_agent;
91 rvp->send_agent = NULL;
92 ib_unregister_mad_agent(mad_agent: agent);
93 if (rdi->driver_f.notify_free_mad_agent)
94 rdi->driver_f.notify_free_mad_agent(rdi, p);
95 }
96 }
97
98 return ret;
99}
100
101/**
102 * rvt_free_mad_agents - free up mad agents
103 * @rdi: rvt dev struct
104 *
105 * If driver needs notification of mad agent removal make the call back
106 */
107void rvt_free_mad_agents(struct rvt_dev_info *rdi)
108{
109 struct ib_mad_agent *agent;
110 struct rvt_ibport *rvp;
111 int p;
112
113 for (p = 0; p < rdi->dparms.nports; p++) {
114 rvp = rdi->ports[p];
115 if (rvp->send_agent) {
116 agent = rvp->send_agent;
117 rvp->send_agent = NULL;
118 ib_unregister_mad_agent(mad_agent: agent);
119 }
120 if (rvp->sm_ah) {
121 rdma_destroy_ah(ah: &rvp->sm_ah->ibah,
122 flags: RDMA_DESTROY_AH_SLEEPABLE);
123 rvp->sm_ah = NULL;
124 }
125
126 if (rdi->driver_f.notify_free_mad_agent)
127 rdi->driver_f.notify_free_mad_agent(rdi, p);
128 }
129}
130
131

source code of linux/drivers/infiniband/sw/rdmavt/mad.c