aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/mlx4/ah.c
blob: a251becdaa987dc1653ef59b7e23b61889e22636 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>

#include <linux/slab.h>
#include <linux/inet.h>
#include <linux/string.h>

#include "mlx4_ib.h"

int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
			u8 *mac, int *is_mcast, u8 port)
{
	struct in6_addr in6;

	*is_mcast = 0;

	memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
	if (rdma_link_local_addr(&in6))
		rdma_get_ll_mac(&in6, mac);
	else if (rdma_is_multicast_addr(&in6)) {
		rdma_get_mcast_mac(&in6, mac);
		*is_mcast = 1;
	} else
		return -EINVAL;

	return 0;
}

static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
				  struct mlx4_ib_ah *ah)
{
	struct mlx4_dev *dev = to_mdev(pd->device)->dev;

	ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
	ah->av.ib.g_slid  = ah_attr->src_path_bits;
	if (ah_attr->ah_flags & IB_AH_GRH) {
		ah->av.ib.g_slid   |= 0x80;
		ah->av.ib.gid_index = ah_attr->grh.sgid_index;
		ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
		ah->av.ib.sl_tclass_flowlabel |=
			cpu_to_be32((ah_attr->grh.traffic_class << 20) |
				    ah_attr->grh.flow_label);
		memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
	}

	ah->av.ib.dlid    = cpu_to_be16(ah_attr->dlid);
	if (ah_attr->static_rate) {
		ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
		while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
		       !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
			--ah->av.ib.stat_rate;
	}
	ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);

	return &ah->ibah;
}

static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
				    struct mlx4_ib_ah *ah)
{
	struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
	struct mlx4_dev *dev = ibdev->dev;
	union ib_gid sgid;
	u8 mac[6];
	int err;
	int is_mcast;
	u16 vlan_tag;

	err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
	if (err)
		return ERR_PTR(err);

	memcpy(ah->av.eth.mac, mac, 6);
	err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
	if (err)
		return ERR_PTR(err);
	vlan_tag = rdma_get_vlan_id(&sgid);
	if (vlan_tag < 0x1000)
		vlan_tag |= (ah_attr->sl & 7) << 13;
	ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
	ah->av.eth.gid_index = ah_attr->grh.sgid_index;
	ah->av.eth.vlan = cpu_to_be16(vlan_tag);
	if (ah_attr->static_rate) {
		ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
		while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
		       !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
			--ah->av.eth.stat_rate;
	}

	/*
	 * HW requires multicast LID so we just choose one.
	 */
	if (is_mcast)
		ah->av.ib.dlid = cpu_to_be16(0xc000);

	memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
	ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);

	return &ah->ibah;
}

struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
{
	struct mlx4_ib_ah *ah;
	struct ib_ah *ret;

	ah = kzalloc(sizeof *ah, GFP_ATOMIC);
	if (!ah)
		return ERR_PTR(-ENOMEM);

	if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
		if (!(ah_attr->ah_flags & IB_AH_GRH)) {
			ret = ERR_PTR(-EINVAL);
		} else {
			/*
			 * TBD: need to handle the case when we get
			 * called in an atomic context and there we
			 * might sleep.  We don't expect this
			 * currently since we're working with link
			 * local addresses which we can translate
			 * without going to sleep.
			 */
			ret = create_iboe_ah(pd, ah_attr, ah);
		}

		if (IS_ERR(ret))
			kfree(ah);

		return ret;
	} else
		return create_ib_ah(pd, ah_attr, ah); /* never fails */
}

int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
{
	struct mlx4_ib_ah *ah = to_mah(ibah);
	enum rdma_link_layer ll;

	memset(ah_attr, 0, sizeof *ah_attr);
	ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
	ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
	ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
	ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
	if (ah->av.ib.stat_rate)
		ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
	ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;

	if (mlx4_ib_ah_grh_present(ah)) {
		ah_attr->ah_flags = IB_AH_GRH;

		ah_attr->grh.traffic_class =
			be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
		ah_attr->grh.flow_label =
			be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
		ah_attr->grh.hop_limit  = ah->av.ib.hop_limit;
		ah_attr->grh.sgid_index = ah->av.ib.gid_index;
		memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
	}

	return 0;
}

int mlx4_ib_destroy_ah(struct ib_ah *ah)
{
	kfree(to_mah(ah));
	return 0;
}