1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2016 - 2019 Intel Corporation.
4 */
5
6#include <linux/slab.h>
7#include "ah.h"
8#include "vt.h" /* for prints */
9
10/**
11 * rvt_check_ah - validate the attributes of AH
12 * @ibdev: the ib device
13 * @ah_attr: the attributes of the AH
14 *
15 * If driver supports a more detailed check_ah function call back to it
16 * otherwise just check the basics.
17 *
18 * Return: 0 on success
19 */
20int rvt_check_ah(struct ib_device *ibdev,
21 struct rdma_ah_attr *ah_attr)
22{
23 int err;
24 int port_num = rdma_ah_get_port_num(attr: ah_attr);
25 struct ib_port_attr port_attr;
26 struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
27 u8 ah_flags = rdma_ah_get_ah_flags(attr: ah_attr);
28 u8 static_rate = rdma_ah_get_static_rate(attr: ah_attr);
29
30 err = ib_query_port(device: ibdev, port_num, port_attr: &port_attr);
31 if (err)
32 return -EINVAL;
33 if (port_num < 1 ||
34 port_num > ibdev->phys_port_cnt)
35 return -EINVAL;
36 if (static_rate != IB_RATE_PORT_CURRENT &&
37 ib_rate_to_mbps(rate: static_rate) < 0)
38 return -EINVAL;
39 if ((ah_flags & IB_AH_GRH) &&
40 rdma_ah_read_grh(attr: ah_attr)->sgid_index >= port_attr.gid_tbl_len)
41 return -EINVAL;
42 if (rdi->driver_f.check_ah)
43 return rdi->driver_f.check_ah(ibdev, ah_attr);
44 return 0;
45}
46EXPORT_SYMBOL(rvt_check_ah);
47
48/**
49 * rvt_create_ah - create an address handle
50 * @ibah: the IB address handle
51 * @init_attr: the attributes of the AH
52 * @udata: pointer to user's input output buffer information.
53 *
54 * This may be called from interrupt context.
55 *
56 * Return: 0 on success
57 */
58int rvt_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
59 struct ib_udata *udata)
60{
61 struct rvt_ah *ah = ibah_to_rvtah(ibah);
62 struct rvt_dev_info *dev = ib_to_rvt(ibdev: ibah->device);
63 unsigned long flags;
64
65 if (rvt_check_ah(ibah->device, init_attr->ah_attr))
66 return -EINVAL;
67
68 spin_lock_irqsave(&dev->n_ahs_lock, flags);
69 if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
70 spin_unlock_irqrestore(lock: &dev->n_ahs_lock, flags);
71 return -ENOMEM;
72 }
73
74 dev->n_ahs_allocated++;
75 spin_unlock_irqrestore(lock: &dev->n_ahs_lock, flags);
76
77 rdma_copy_ah_attr(dest: &ah->attr, src: init_attr->ah_attr);
78
79 if (dev->driver_f.notify_new_ah)
80 dev->driver_f.notify_new_ah(ibah->device,
81 init_attr->ah_attr, ah);
82
83 return 0;
84}
85
86/**
87 * rvt_destroy_ah - Destroy an address handle
88 * @ibah: address handle
89 * @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags)
90 * Return: 0 on success
91 */
92int rvt_destroy_ah(struct ib_ah *ibah, u32 destroy_flags)
93{
94 struct rvt_dev_info *dev = ib_to_rvt(ibdev: ibah->device);
95 struct rvt_ah *ah = ibah_to_rvtah(ibah);
96 unsigned long flags;
97
98 spin_lock_irqsave(&dev->n_ahs_lock, flags);
99 dev->n_ahs_allocated--;
100 spin_unlock_irqrestore(lock: &dev->n_ahs_lock, flags);
101
102 rdma_destroy_ah_attr(ah_attr: &ah->attr);
103 return 0;
104}
105
106/**
107 * rvt_modify_ah - modify an ah with given attrs
108 * @ibah: address handle to modify
109 * @ah_attr: attrs to apply
110 *
111 * Return: 0 on success
112 */
113int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
114{
115 struct rvt_ah *ah = ibah_to_rvtah(ibah);
116
117 if (rvt_check_ah(ibah->device, ah_attr))
118 return -EINVAL;
119
120 ah->attr = *ah_attr;
121
122 return 0;
123}
124
125/**
126 * rvt_query_ah - return attrs for ah
127 * @ibah: address handle to query
128 * @ah_attr: return info in this
129 *
130 * Return: always 0
131 */
132int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
133{
134 struct rvt_ah *ah = ibah_to_rvtah(ibah);
135
136 *ah_attr = ah->attr;
137
138 return 0;
139}
140

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