1 /*-
2 * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: stable/12/sys/dev/mlx5/mlx5_ib/mlx5_ib_ah.c 330508 2018-03-05 14:34:52Z hselasky $
26 */
27
28 #include "mlx5_ib.h"
29
create_ib_ah(struct mlx5_ib_dev * dev,struct mlx5_ib_ah * ah,struct ib_ah_attr * ah_attr,enum rdma_link_layer ll)30 static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
31 struct mlx5_ib_ah *ah,
32 struct ib_ah_attr *ah_attr,
33 enum rdma_link_layer ll)
34 {
35 if (ah_attr->ah_flags & IB_AH_GRH) {
36 memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
37 ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
38 (1 << 30) |
39 ah_attr->grh.sgid_index << 20);
40 ah->av.hop_limit = ah_attr->grh.hop_limit;
41 ah->av.tclass = ah_attr->grh.traffic_class;
42 }
43
44 ah->av.stat_rate_sl = (ah_attr->static_rate << 4);
45
46 if (ll == IB_LINK_LAYER_ETHERNET) {
47 memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac));
48 ah->av.udp_sport =
49 mlx5_get_roce_udp_sport(dev,
50 ah_attr->port_num,
51 ah_attr->grh.sgid_index);
52 ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1;
53 } else {
54 ah->av.rlid = cpu_to_be16(ah_attr->dlid);
55 ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
56 ah->av.stat_rate_sl |= (ah_attr->sl & 0xf);
57 }
58
59 return &ah->ibah;
60 }
61
mlx5_ib_create_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr,struct ib_udata * udata)62 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
63 struct ib_udata *udata)
64
65 {
66 struct mlx5_ib_ah *ah;
67 struct mlx5_ib_dev *dev = to_mdev(pd->device);
68 enum rdma_link_layer ll;
69
70 ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
71
72 if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
73 return ERR_PTR(-EINVAL);
74
75 if (ll == IB_LINK_LAYER_ETHERNET && udata) {
76 int err;
77 struct mlx5_ib_create_ah_resp resp = {};
78 u32 min_resp_len = offsetof(typeof(resp), dmac) +
79 sizeof(resp.dmac);
80
81 if (udata->outlen < min_resp_len)
82 return ERR_PTR(-EINVAL);
83
84 resp.response_length = min_resp_len;
85
86 err = ib_resolve_eth_dmac(pd->device, ah_attr);
87 if (err)
88 return ERR_PTR(err);
89
90 memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN);
91 err = ib_copy_to_udata(udata, &resp, resp.response_length);
92 if (err)
93 return ERR_PTR(err);
94 }
95
96 ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
97 if (!ah)
98 return ERR_PTR(-ENOMEM);
99
100 return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
101 }
102
mlx5_ib_query_ah(struct ib_ah * ibah,struct ib_ah_attr * ah_attr)103 int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
104 {
105 struct mlx5_ib_ah *ah = to_mah(ibah);
106 u32 tmp;
107
108 memset(ah_attr, 0, sizeof(*ah_attr));
109
110 tmp = be32_to_cpu(ah->av.grh_gid_fl);
111 if (tmp & (1 << 30)) {
112 ah_attr->ah_flags = IB_AH_GRH;
113 ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
114 ah_attr->grh.flow_label = tmp & 0xfffff;
115 memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
116 ah_attr->grh.hop_limit = ah->av.hop_limit;
117 ah_attr->grh.traffic_class = ah->av.tclass;
118 }
119 ah_attr->dlid = be16_to_cpu(ah->av.rlid);
120 ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
121 ah_attr->sl = ah->av.stat_rate_sl & 0xf;
122
123 return 0;
124 }
125
mlx5_ib_destroy_ah(struct ib_ah * ah)126 int mlx5_ib_destroy_ah(struct ib_ah *ah)
127 {
128 kfree(to_mah(ah));
129 return 0;
130 }
131