2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
35 static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
36 struct mlx5_ib_ah *ah,
37 struct ib_ah_attr *ah_attr,
38 enum rdma_link_layer ll)
40 if (ah_attr->ah_flags & IB_AH_GRH) {
41 memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
42 ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
44 ah_attr->grh.sgid_index << 20);
45 ah->av.hop_limit = ah_attr->grh.hop_limit;
46 ah->av.tclass = ah_attr->grh.traffic_class;
49 ah->av.stat_rate_sl = (ah_attr->static_rate << 4);
51 if (ll == IB_LINK_LAYER_ETHERNET) {
52 memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac));
54 mlx5_get_roce_udp_sport(dev,
56 ah_attr->grh.sgid_index);
57 ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1;
59 ah->av.rlid = cpu_to_be16(ah_attr->dlid);
60 ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
61 ah->av.stat_rate_sl |= (ah_attr->sl & 0xf);
67 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
68 struct ib_udata *udata)
71 struct mlx5_ib_ah *ah;
72 struct mlx5_ib_dev *dev = to_mdev(pd->device);
73 enum rdma_link_layer ll;
75 ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
77 if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
78 return ERR_PTR(-EINVAL);
80 if (ll == IB_LINK_LAYER_ETHERNET && udata) {
82 struct mlx5_ib_create_ah_resp resp = {};
83 u32 min_resp_len = offsetof(typeof(resp), dmac) +
86 if (udata->outlen < min_resp_len)
87 return ERR_PTR(-EINVAL);
89 resp.response_length = min_resp_len;
91 err = ib_resolve_eth_dmac(pd->device, ah_attr);
95 memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN);
96 err = ib_copy_to_udata(udata, &resp, resp.response_length);
101 ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
103 return ERR_PTR(-ENOMEM);
105 return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
108 int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
110 struct mlx5_ib_ah *ah = to_mah(ibah);
113 memset(ah_attr, 0, sizeof(*ah_attr));
115 tmp = be32_to_cpu(ah->av.grh_gid_fl);
116 if (tmp & (1 << 30)) {
117 ah_attr->ah_flags = IB_AH_GRH;
118 ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
119 ah_attr->grh.flow_label = tmp & 0xfffff;
120 memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
121 ah_attr->grh.hop_limit = ah->av.hop_limit;
122 ah_attr->grh.traffic_class = ah->av.tclass;
124 ah_attr->dlid = be16_to_cpu(ah->av.rlid);
125 ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
126 ah_attr->sl = ah->av.stat_rate_sl & 0xf;
131 int mlx5_ib_destroy_ah(struct ib_ah *ah)