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