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 | */ |
20 | int 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 | } |
46 | EXPORT_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 | */ |
58 | int 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 | */ |
92 | int 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 | */ |
113 | int 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 | */ |
132 | int 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 | |