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(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(&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
 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(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(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