1 /*
2 * Copyright (c) 2013, Mellanox Technologies inc. 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
create_ib_ah(struct ib_ah_attr * ah_attr,struct mlx5_ib_ah * ah)35 struct 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
mlx5_ib_create_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr)54 struct 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
mlx5_ib_query_ah(struct ib_ah * ibah,struct ib_ah_attr * ah_attr)65 int 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
mlx5_ib_destroy_ah(struct ib_ah * ah)88 int mlx5_ib_destroy_ah(struct ib_ah *ah)
89 {
90 kfree(to_mah(ah));
91 return 0;
92 }
93