mlx5_ib_ah.c revision 331769 
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/11/sys/dev/mlx5/mlx5_ib/mlx5_ib_ah.c 331769 2018-03-30 18:06:29Z hselasky $
26 */
27
28#include "mlx5_ib.h"
29
30static 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
62struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
63{
64	struct mlx5_ib_ah *ah;
65	struct mlx5_ib_dev *dev = to_mdev(pd->device);
66	enum rdma_link_layer ll;
67
68	ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
69
70	if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
71		return ERR_PTR(-EINVAL);
72
73	ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
74	if (!ah)
75		return ERR_PTR(-ENOMEM);
76
77	return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
78}
79
80int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
81{
82	struct mlx5_ib_ah *ah = to_mah(ibah);
83	u32 tmp;
84
85	memset(ah_attr, 0, sizeof(*ah_attr));
86
87	tmp = be32_to_cpu(ah->av.grh_gid_fl);
88	if (tmp & (1 << 30)) {
89		ah_attr->ah_flags = IB_AH_GRH;
90		ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
91		ah_attr->grh.flow_label = tmp & 0xfffff;
92		memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
93		ah_attr->grh.hop_limit = ah->av.hop_limit;
94		ah_attr->grh.traffic_class = ah->av.tclass;
95	}
96	ah_attr->dlid = be16_to_cpu(ah->av.rlid);
97	ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
98	ah_attr->sl = ah->av.stat_rate_sl & 0xf;
99
100	return 0;
101}
102
103int mlx5_ib_destroy_ah(struct ib_ah *ah)
104{
105	kfree(to_mah(ah));
106	return 0;
107}
108