1/*
2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses.  You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include "mlx5_ib.h"
34
35struct ib_ah *create_ib_ah(struct ib_ah_attr *ah_attr,
36			   struct mlx5_ib_ah *ah)
37{
38	if (ah_attr->ah_flags & IB_AH_GRH) {
39		memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
40		ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
41						(1 << 30) |
42						ah_attr->grh.sgid_index << 20);
43		ah->av.hop_limit = ah_attr->grh.hop_limit;
44		ah->av.tclass = ah_attr->grh.traffic_class;
45	}
46
47	ah->av.rlid = cpu_to_be16(ah_attr->dlid);
48	ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
49	ah->av.stat_rate_sl = (ah_attr->static_rate << 4) | (ah_attr->sl & 0xf);
50
51	return &ah->ibah;
52}
53
54struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
55{
56	struct mlx5_ib_ah *ah;
57
58	ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
59	if (!ah)
60		return ERR_PTR(-ENOMEM);
61
62	return create_ib_ah(ah_attr, ah); /* never fails */
63}
64
65int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
66{
67	struct mlx5_ib_ah *ah = to_mah(ibah);
68	u32 tmp;
69
70	memset(ah_attr, 0, sizeof(*ah_attr));
71
72	tmp = be32_to_cpu(ah->av.grh_gid_fl);
73	if (tmp & (1 << 30)) {
74		ah_attr->ah_flags = IB_AH_GRH;
75		ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
76		ah_attr->grh.flow_label = tmp & 0xfffff;
77		memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
78		ah_attr->grh.hop_limit = ah->av.hop_limit;
79		ah_attr->grh.traffic_class = ah->av.tclass;
80	}
81	ah_attr->dlid = be16_to_cpu(ah->av.rlid);
82	ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
83	ah_attr->sl = ah->av.stat_rate_sl & 0xf;
84
85	return 0;
86}
87
88int mlx5_ib_destroy_ah(struct ib_ah *ah)
89{
90	kfree(to_mah(ah));
91	return 0;
92}
93