xref: /openbmc/linux/drivers/infiniband/sw/rdmavt/mad.c (revision d164bf64)
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  */
rvt_process_mad(struct ib_device * ibdev,int mad_flags,u32 port_num,const struct ib_wc * in_wc,const struct ib_grh * in_grh,const struct ib_mad_hdr * in,size_t in_mad_size,struct ib_mad_hdr * out,size_t * out_mad_size,u16 * out_mad_pkey_index)31 int 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 
rvt_send_mad_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)46 static 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(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  */
rvt_create_mad_agents(struct rvt_dev_info * rdi)60 int 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(&rdi->ibdev, p + 1,
70 					      IB_QPT_SMI,
71 					      NULL, 0, rvt_send_mad_handler,
72 					      NULL, NULL, 0);
73 		if (IS_ERR(agent)) {
74 			ret = PTR_ERR(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 
86 err:
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(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  */
rvt_free_mad_agents(struct rvt_dev_info * rdi)107 void 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(agent);
119 		}
120 		if (rvp->sm_ah) {
121 			rdma_destroy_ah(&rvp->sm_ah->ibah,
122 					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