1 /*
2 * Copyright (c) 2007 Cisco Systems, Inc. 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 <rdma/ib_addr.h>
34 #include <rdma/ib_cache.h>
35
36 #include <linux/slab.h>
37 #include <linux/inet.h>
38 #include <linux/string.h>
39
40 #include "mlx4_ib.h"
41
mlx4_ib_resolve_grh(struct mlx4_ib_dev * dev,const struct ib_ah_attr * ah_attr,u8 * mac,int * is_mcast,u8 port)42 int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
43 u8 *mac, int *is_mcast, u8 port)
44 {
45 struct in6_addr in6;
46
47 *is_mcast = 0;
48
49 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
50 if (rdma_link_local_addr(&in6))
51 rdma_get_ll_mac(&in6, mac);
52 else if (rdma_is_multicast_addr(&in6)) {
53 rdma_get_mcast_mac(&in6, mac);
54 *is_mcast = 1;
55 } else
56 return -EINVAL;
57
58 return 0;
59 }
60
create_ib_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr,struct mlx4_ib_ah * ah)61 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
62 struct mlx4_ib_ah *ah)
63 {
64 struct mlx4_dev *dev = to_mdev(pd->device)->dev;
65
66 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
67 ah->av.ib.g_slid = ah_attr->src_path_bits;
68 if (ah_attr->ah_flags & IB_AH_GRH) {
69 ah->av.ib.g_slid |= 0x80;
70 ah->av.ib.gid_index = ah_attr->grh.sgid_index;
71 ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
72 ah->av.ib.sl_tclass_flowlabel |=
73 cpu_to_be32((ah_attr->grh.traffic_class << 20) |
74 ah_attr->grh.flow_label);
75 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
76 }
77
78 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid);
79 if (ah_attr->static_rate) {
80 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
81 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
82 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
83 --ah->av.ib.stat_rate;
84 }
85 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
86
87 return &ah->ibah;
88 }
89
create_iboe_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr,struct mlx4_ib_ah * ah)90 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
91 struct mlx4_ib_ah *ah)
92 {
93 struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
94 struct mlx4_dev *dev = ibdev->dev;
95 union ib_gid sgid;
96 u8 mac[6];
97 int err;
98 int is_mcast;
99 u16 vlan_tag;
100
101 err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
102 if (err)
103 return ERR_PTR(err);
104
105 memcpy(ah->av.eth.mac, mac, 6);
106 err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
107 if (err)
108 return ERR_PTR(err);
109 vlan_tag = rdma_get_vlan_id(&sgid);
110 if (vlan_tag < 0x1000)
111 vlan_tag |= (ah_attr->sl & 7) << 13;
112 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
113 ah->av.eth.gid_index = ah_attr->grh.sgid_index;
114 ah->av.eth.vlan = cpu_to_be16(vlan_tag);
115 if (ah_attr->static_rate) {
116 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
117 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
118 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
119 --ah->av.eth.stat_rate;
120 }
121
122 /*
123 * HW requires multicast LID so we just choose one.
124 */
125 if (is_mcast)
126 ah->av.ib.dlid = cpu_to_be16(0xc000);
127
128 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
129 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);
130
131 return &ah->ibah;
132 }
133
mlx4_ib_create_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr)134 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
135 {
136 struct mlx4_ib_ah *ah;
137 struct ib_ah *ret;
138
139 ah = kzalloc(sizeof *ah, GFP_ATOMIC);
140 if (!ah)
141 return ERR_PTR(-ENOMEM);
142
143 if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
144 if (!(ah_attr->ah_flags & IB_AH_GRH)) {
145 ret = ERR_PTR(-EINVAL);
146 } else {
147 /*
148 * TBD: need to handle the case when we get
149 * called in an atomic context and there we
150 * might sleep. We don't expect this
151 * currently since we're working with link
152 * local addresses which we can translate
153 * without going to sleep.
154 */
155 ret = create_iboe_ah(pd, ah_attr, ah);
156 }
157
158 if (IS_ERR(ret))
159 kfree(ah);
160
161 return ret;
162 } else
163 return create_ib_ah(pd, ah_attr, ah); /* never fails */
164 }
165
mlx4_ib_query_ah(struct ib_ah * ibah,struct ib_ah_attr * ah_attr)166 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
167 {
168 struct mlx4_ib_ah *ah = to_mah(ibah);
169 enum rdma_link_layer ll;
170
171 memset(ah_attr, 0, sizeof *ah_attr);
172 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
173 ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
174 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
175 ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
176 if (ah->av.ib.stat_rate)
177 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
178 ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
179
180 if (mlx4_ib_ah_grh_present(ah)) {
181 ah_attr->ah_flags = IB_AH_GRH;
182
183 ah_attr->grh.traffic_class =
184 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
185 ah_attr->grh.flow_label =
186 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
187 ah_attr->grh.hop_limit = ah->av.ib.hop_limit;
188 ah_attr->grh.sgid_index = ah->av.ib.gid_index;
189 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
190 }
191
192 return 0;
193 }
194
mlx4_ib_destroy_ah(struct ib_ah * ah)195 int mlx4_ib_destroy_ah(struct ib_ah *ah)
196 {
197 kfree(to_mah(ah));
198 return 0;
199 }
200