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
35static __be16 mlx5_ah_get_udp_sport(const struct mlx5_ib_dev *dev,
36				  const struct rdma_ah_attr *ah_attr)
37{
38	enum ib_gid_type gid_type = ah_attr->grh.sgid_attr->gid_type;
39	__be16 sport;
40
41	if ((gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) &&
42	    (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
43	    (ah_attr->grh.flow_label & IB_GRH_FLOWLABEL_MASK))
44		sport = cpu_to_be16(
45			rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
46	else
47		sport = mlx5_get_roce_udp_sport_min(dev,
48						    ah_attr->grh.sgid_attr);
49
50	return sport;
51}
52
53static void create_ib_ah(struct mlx5_ib_dev *dev, struct mlx5_ib_ah *ah,
54			 struct rdma_ah_init_attr *init_attr)
55{
56	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
57	enum ib_gid_type gid_type;
58
59	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
60		const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
61
62		memcpy(ah->av.rgid, &grh->dgid, 16);
63		ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
64						(1 << 30) |
65						grh->sgid_index << 20);
66		ah->av.hop_limit = grh->hop_limit;
67		ah->av.tclass = grh->traffic_class;
68	}
69
70	ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
71
72	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
73		if (init_attr->xmit_slave)
74			ah->xmit_port =
75				mlx5_lag_get_slave_port(dev->mdev,
76							init_attr->xmit_slave);
77		gid_type = ah_attr->grh.sgid_attr->gid_type;
78
79		memcpy(ah->av.rmac, ah_attr->roce.dmac,
80		       sizeof(ah_attr->roce.dmac));
81		ah->av.udp_sport = mlx5_ah_get_udp_sport(dev, ah_attr);
82		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
83		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
84#define MLX5_ECN_ENABLED BIT(1)
85			ah->av.tclass |= MLX5_ECN_ENABLED;
86	} else {
87		ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
88		ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
89		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
90	}
91}
92
93int mlx5_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
94		      struct ib_udata *udata)
95
96{
97	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
98	struct mlx5_ib_ah *ah = to_mah(ibah);
99	struct mlx5_ib_dev *dev = to_mdev(ibah->device);
100	enum rdma_ah_attr_type ah_type = ah_attr->type;
101
102	if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
103	    !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
104		return -EINVAL;
105
106	if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
107		int err;
108		struct mlx5_ib_create_ah_resp resp = {};
109		u32 min_resp_len =
110			offsetofend(struct mlx5_ib_create_ah_resp, dmac);
111
112		if (udata->outlen < min_resp_len)
113			return -EINVAL;
114
115		resp.response_length = min_resp_len;
116
117		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
118		err = ib_copy_to_udata(udata, &resp, resp.response_length);
119		if (err)
120			return err;
121	}
122
123	create_ib_ah(dev, ah, init_attr);
124	return 0;
125}
126
127int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
128{
129	struct mlx5_ib_ah *ah = to_mah(ibah);
130	u32 tmp;
131
132	memset(ah_attr, 0, sizeof(*ah_attr));
133	ah_attr->type = ibah->type;
134
135	tmp = be32_to_cpu(ah->av.grh_gid_fl);
136	if (tmp & (1 << 30)) {
137		rdma_ah_set_grh(ah_attr, NULL,
138				tmp & 0xfffff,
139				(tmp >> 20) & 0xff,
140				ah->av.hop_limit,
141				ah->av.tclass);
142		rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
143	}
144	rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
145	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
146	rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
147
148	return 0;
149}
150