xref: /openbmc/linux/drivers/infiniband/sw/rdmavt/ah.c (revision e639c869)
1 /*
2  * Copyright(c) 2016 Intel Corporation.
3  *
4  * This file is provided under a dual BSD/GPLv2 license.  When using or
5  * redistributing this file, you may do so under either license.
6  *
7  * GPL LICENSE SUMMARY
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * BSD LICENSE
19  *
20  * Redistribution and use in source and binary forms, with or without
21  * modification, are permitted provided that the following conditions
22  * are met:
23  *
24  *  - Redistributions of source code must retain the above copyright
25  *    notice, this list of conditions and the following disclaimer.
26  *  - Redistributions in binary form must reproduce the above copyright
27  *    notice, this list of conditions and the following disclaimer in
28  *    the documentation and/or other materials provided with the
29  *    distribution.
30  *  - Neither the name of Intel Corporation nor the names of its
31  *    contributors may be used to endorse or promote products derived
32  *    from this software without specific prior written permission.
33  *
34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45  *
46  */
47 
48 #include <linux/slab.h>
49 #include "ah.h"
50 #include "vt.h" /* for prints */
51 
52 /**
53  * rvt_check_ah - validate the attributes of AH
54  * @ibdev: the ib device
55  * @ah_attr: the attributes of the AH
56  *
57  * If driver supports a more detailed check_ah function call back to it
58  * otherwise just check the basics.
59  *
60  * Return: 0 on success
61  */
62 int rvt_check_ah(struct ib_device *ibdev,
63 		 struct rdma_ah_attr *ah_attr)
64 {
65 	int err;
66 	int port_num = rdma_ah_get_port_num(ah_attr);
67 	struct ib_port_attr port_attr;
68 	struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
69 	u8 ah_flags = rdma_ah_get_ah_flags(ah_attr);
70 	u8 static_rate = rdma_ah_get_static_rate(ah_attr);
71 
72 	err = ib_query_port(ibdev, port_num, &port_attr);
73 	if (err)
74 		return -EINVAL;
75 	if (port_num < 1 ||
76 	    port_num > ibdev->phys_port_cnt)
77 		return -EINVAL;
78 	if (static_rate != IB_RATE_PORT_CURRENT &&
79 	    ib_rate_to_mbps(static_rate) < 0)
80 		return -EINVAL;
81 	if ((ah_flags & IB_AH_GRH) &&
82 	    rdma_ah_read_grh(ah_attr)->sgid_index >= port_attr.gid_tbl_len)
83 		return -EINVAL;
84 	if (rdi->driver_f.check_ah)
85 		return rdi->driver_f.check_ah(ibdev, ah_attr);
86 	return 0;
87 }
88 EXPORT_SYMBOL(rvt_check_ah);
89 
90 /**
91  * rvt_create_ah - create an address handle
92  * @pd: the protection domain
93  * @ah_attr: the attributes of the AH
94  *
95  * This may be called from interrupt context.
96  *
97  * Return: newly allocated ah
98  */
99 struct ib_ah *rvt_create_ah(struct ib_pd *pd,
100 			    struct rdma_ah_attr *ah_attr)
101 {
102 	struct rvt_ah *ah;
103 	struct rvt_dev_info *dev = ib_to_rvt(pd->device);
104 	unsigned long flags;
105 
106 	if (rvt_check_ah(pd->device, ah_attr))
107 		return ERR_PTR(-EINVAL);
108 
109 	ah = kmalloc(sizeof(*ah), GFP_ATOMIC);
110 	if (!ah)
111 		return ERR_PTR(-ENOMEM);
112 
113 	spin_lock_irqsave(&dev->n_ahs_lock, flags);
114 	if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
115 		spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
116 		kfree(ah);
117 		return ERR_PTR(-ENOMEM);
118 	}
119 
120 	dev->n_ahs_allocated++;
121 	spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
122 
123 	ah->attr = *ah_attr;
124 	atomic_set(&ah->refcount, 0);
125 
126 	if (dev->driver_f.notify_new_ah)
127 		dev->driver_f.notify_new_ah(pd->device, ah_attr, ah);
128 
129 	return &ah->ibah;
130 }
131 
132 /**
133  * rvt_destory_ah - Destory an address handle
134  * @ibah: address handle
135  *
136  * Return: 0 on success
137  */
138 int rvt_destroy_ah(struct ib_ah *ibah)
139 {
140 	struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
141 	struct rvt_ah *ah = ibah_to_rvtah(ibah);
142 	unsigned long flags;
143 
144 	if (atomic_read(&ah->refcount) != 0)
145 		return -EBUSY;
146 
147 	spin_lock_irqsave(&dev->n_ahs_lock, flags);
148 	dev->n_ahs_allocated--;
149 	spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
150 
151 	kfree(ah);
152 
153 	return 0;
154 }
155 
156 /**
157  * rvt_modify_ah - modify an ah with given attrs
158  * @ibah: address handle to modify
159  * @ah_attr: attrs to apply
160  *
161  * Return: 0 on success
162  */
163 int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
164 {
165 	struct rvt_ah *ah = ibah_to_rvtah(ibah);
166 
167 	if (rvt_check_ah(ibah->device, ah_attr))
168 		return -EINVAL;
169 
170 	ah->attr = *ah_attr;
171 
172 	return 0;
173 }
174 
175 /**
176  * rvt_query_ah - return attrs for ah
177  * @ibah: address handle to query
178  * @ah_attr: return info in this
179  *
180  * Return: always 0
181  */
182 int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
183 {
184 	struct rvt_ah *ah = ibah_to_rvtah(ibah);
185 
186 	*ah_attr = ah->attr;
187 
188 	return 0;
189 }
190