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
34 #include <sys/types.h>
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <rdma/ib_addr.h>
38 #include <rdma/ib_cache.h>
39
40 #include <linux/slab.h>
41 #include <linux/string.h>
42
43 #include "mlx4_ib.h"
44
mlx4_ib_resolve_grh(struct mlx4_ib_dev * dev,const struct ib_ah_attr * ah_attr,u8 * mac,int * is_mcast,u8 port)45 int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
46 u8 *mac, int *is_mcast, u8 port)
47 {
48 struct in6_addr in6;
49
50 *is_mcast = 0;
51
52 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
53 if (rdma_link_local_addr(&in6))
54 rdma_get_ll_mac(&in6, mac);
55 else if (rdma_is_multicast_addr(&in6)) {
56 rdma_get_mcast_mac(&in6, mac);
57 *is_mcast = 1;
58 } else
59 return -EINVAL;
60
61 return 0;
62 }
63
create_ib_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr,struct mlx4_ib_ah * ah)64 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
65 struct mlx4_ib_ah *ah)
66 {
67 struct mlx4_dev *dev = to_mdev(pd->device)->dev;
68
69 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
70 ah->av.ib.g_slid = ah_attr->src_path_bits;
71 if (ah_attr->ah_flags & IB_AH_GRH) {
72 ah->av.ib.g_slid |= 0x80;
73 ah->av.ib.gid_index = ah_attr->grh.sgid_index;
74 ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
75 ah->av.ib.sl_tclass_flowlabel |=
76 cpu_to_be32((ah_attr->grh.traffic_class << 20) |
77 ah_attr->grh.flow_label);
78 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
79 }
80
81 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid);
82 if (ah_attr->static_rate) {
83 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
84 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
85 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
86 --ah->av.ib.stat_rate;
87 }
88 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
89
90 return &ah->ibah;
91 }
92
create_iboe_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr,struct mlx4_ib_ah * ah)93 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
94 struct mlx4_ib_ah *ah)
95 {
96 struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
97 struct mlx4_dev *dev = ibdev->dev;
98 union ib_gid sgid;
99 u8 mac[6];
100 int err;
101 int is_mcast;
102 u16 vlan_tag;
103
104 err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
105 if (err)
106 return ERR_PTR(err);
107
108 memcpy(ah->av.eth.mac, mac, 6);
109 err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
110 if (err)
111 return ERR_PTR(err);
112 vlan_tag = rdma_get_vlan_id(&sgid);
113 if (vlan_tag < 0x1000)
114 vlan_tag |= (ah_attr->sl & 7) << 13;
115 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
116 ah->av.eth.gid_index = ah_attr->grh.sgid_index;
117 ah->av.eth.vlan = cpu_to_be16(vlan_tag);
118 if (ah_attr->static_rate) {
119 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
120 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
121 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
122 --ah->av.eth.stat_rate;
123 }
124
125 /*
126 * HW requires multicast LID so we just choose one.
127 */
128 if (is_mcast)
129 ah->av.ib.dlid = cpu_to_be16(0xc000);
130
131 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
132 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);
133
134 return &ah->ibah;
135 }
136
mlx4_ib_create_ah(struct ib_pd * pd,struct ib_ah_attr * ah_attr)137 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
138 {
139 struct mlx4_ib_ah *ah;
140 struct ib_ah *ret;
141
142 ah = kzalloc(sizeof *ah, GFP_ATOMIC);
143 if (!ah)
144 return ERR_PTR(-ENOMEM);
145
146 if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
147 if (!(ah_attr->ah_flags & IB_AH_GRH)) {
148 ret = ERR_PTR(-EINVAL);
149 } else {
150 /*
151 * TBD: need to handle the case when we get
152 * called in an atomic context and there we
153 * might sleep. We don't expect this
154 * currently since we're working with link
155 * local addresses which we can translate
156 * without going to sleep.
157 */
158 ret = create_iboe_ah(pd, ah_attr, ah);
159 }
160
161 if (IS_ERR(ret))
162 kfree(ah);
163
164 return ret;
165 } else
166 return create_ib_ah(pd, ah_attr, ah); /* never fails */
167 }
168
mlx4_ib_query_ah(struct ib_ah * ibah,struct ib_ah_attr * ah_attr)169 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
170 {
171 struct mlx4_ib_ah *ah = to_mah(ibah);
172 enum rdma_link_layer ll;
173
174 memset(ah_attr, 0, sizeof *ah_attr);
175 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
176 ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
177 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
178 ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
179 if (ah->av.ib.stat_rate)
180 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
181 ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
182
183 if (mlx4_ib_ah_grh_present(ah)) {
184 ah_attr->ah_flags = IB_AH_GRH;
185
186 ah_attr->grh.traffic_class =
187 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
188 ah_attr->grh.flow_label =
189 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
190 ah_attr->grh.hop_limit = ah->av.ib.hop_limit;
191 ah_attr->grh.sgid_index = ah->av.ib.gid_index;
192 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
193 }
194
195 return 0;
196 }
197
mlx4_ib_destroy_ah(struct ib_ah * ah)198 int mlx4_ib_destroy_ah(struct ib_ah *ah)
199 {
200 kfree(to_mah(ah));
201 return 0;
202 }
203