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
create_ib_ah(struct mlx5_ib_dev * dev,struct mlx5_ib_ah * ah,struct rdma_ah_attr * ah_attr)35 static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
36 struct mlx5_ib_ah *ah,
37 struct rdma_ah_attr *ah_attr)
38 {
39 enum ib_gid_type gid_type;
40
41 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
42 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
43
44 memcpy(ah->av.rgid, &grh->dgid, 16);
45 ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
46 (1 << 30) |
47 grh->sgid_index << 20);
48 ah->av.hop_limit = grh->hop_limit;
49 ah->av.tclass = grh->traffic_class;
50 }
51
52 ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
53
54 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
55 gid_type = ah_attr->grh.sgid_attr->gid_type;
56
57 memcpy(ah->av.rmac, ah_attr->roce.dmac,
58 sizeof(ah_attr->roce.dmac));
59 ah->av.udp_sport =
60 mlx5_get_roce_udp_sport(dev, ah_attr->grh.sgid_attr);
61 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
62 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
63 #define MLX5_ECN_ENABLED BIT(1)
64 ah->av.tclass |= MLX5_ECN_ENABLED;
65 } else {
66 ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
67 ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
68 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
69 }
70
71 return &ah->ibah;
72 }
73
mlx5_ib_create_ah(struct ib_pd * pd,struct rdma_ah_attr * ah_attr,struct ib_udata * udata)74 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
75 struct ib_udata *udata)
76
77 {
78 struct mlx5_ib_ah *ah;
79 struct mlx5_ib_dev *dev = to_mdev(pd->device);
80 enum rdma_ah_attr_type ah_type = ah_attr->type;
81
82 if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
83 !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
84 return ERR_PTR(-EINVAL);
85
86 if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
87 int err;
88 struct mlx5_ib_create_ah_resp resp = {};
89 u32 min_resp_len = offsetof(typeof(resp), dmac) +
90 sizeof(resp.dmac);
91
92 if (udata->outlen < min_resp_len)
93 return ERR_PTR(-EINVAL);
94
95 resp.response_length = min_resp_len;
96
97 memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
98 err = ib_copy_to_udata(udata, &resp, resp.response_length);
99 if (err)
100 return ERR_PTR(err);
101 }
102
103 ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
104 if (!ah)
105 return ERR_PTR(-ENOMEM);
106
107 return create_ib_ah(dev, ah, ah_attr); /* never fails */
108 }
109
mlx5_ib_query_ah(struct ib_ah * ibah,struct rdma_ah_attr * ah_attr)110 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
111 {
112 struct mlx5_ib_ah *ah = to_mah(ibah);
113 u32 tmp;
114
115 memset(ah_attr, 0, sizeof(*ah_attr));
116 ah_attr->type = ibah->type;
117
118 tmp = be32_to_cpu(ah->av.grh_gid_fl);
119 if (tmp & (1 << 30)) {
120 rdma_ah_set_grh(ah_attr, NULL,
121 tmp & 0xfffff,
122 (tmp >> 20) & 0xff,
123 ah->av.hop_limit,
124 ah->av.tclass);
125 rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
126 }
127 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
128 rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
129 rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
130
131 return 0;
132 }
133
mlx5_ib_destroy_ah(struct ib_ah * ah)134 int mlx5_ib_destroy_ah(struct ib_ah *ah)
135 {
136 kfree(to_mah(ah));
137 return 0;
138 }
139
