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 #include <linux/mlx4/driver.h>
40
41 #include "mlx4_ib.h"
42
create_ib_ah(struct ib_ah * ib_ah,struct rdma_ah_attr * ah_attr)43 static void create_ib_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr)
44 {
45 struct mlx4_ib_ah *ah = to_mah(ib_ah);
46 struct mlx4_dev *dev = to_mdev(ib_ah->device)->dev;
47
48 ah->av.ib.port_pd = cpu_to_be32(to_mpd(ib_ah->pd)->pdn |
49 (rdma_ah_get_port_num(ah_attr) << 24));
50 ah->av.ib.g_slid = rdma_ah_get_path_bits(ah_attr);
51 ah->av.ib.sl_tclass_flowlabel =
52 cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28);
53 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
54 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
55
56 ah->av.ib.g_slid |= 0x80;
57 ah->av.ib.gid_index = grh->sgid_index;
58 ah->av.ib.hop_limit = grh->hop_limit;
59 ah->av.ib.sl_tclass_flowlabel |=
60 cpu_to_be32((grh->traffic_class << 20) |
61 grh->flow_label);
62 memcpy(ah->av.ib.dgid, grh->dgid.raw, 16);
63 }
64
65 ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
66 if (rdma_ah_get_static_rate(ah_attr)) {
67 u8 static_rate = rdma_ah_get_static_rate(ah_attr) +
68 MLX4_STAT_RATE_OFFSET;
69
70 while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
71 !(1 << static_rate & dev->caps.stat_rate_support))
72 --static_rate;
73 ah->av.ib.stat_rate = static_rate;
74 }
75 }
76
create_iboe_ah(struct ib_ah * ib_ah,struct rdma_ah_attr * ah_attr)77 static int create_iboe_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr)
78 {
79 struct mlx4_ib_dev *ibdev = to_mdev(ib_ah->device);
80 struct mlx4_ib_ah *ah = to_mah(ib_ah);
81 const struct ib_gid_attr *gid_attr;
82 struct mlx4_dev *dev = ibdev->dev;
83 int is_mcast = 0;
84 struct in6_addr in6;
85 u16 vlan_tag = 0xffff;
86 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
87 int ret;
88
89 memcpy(&in6, grh->dgid.raw, sizeof(in6));
90 if (rdma_is_multicast_addr(&in6))
91 is_mcast = 1;
92
93 memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN);
94 eth_zero_addr(ah->av.eth.s_mac);
95
96 /*
97 * If sgid_attr is NULL we are being called by mlx4_ib_create_ah_slave
98 * and we are directly creating an AV for a slave's gid_index.
99 */
100 gid_attr = ah_attr->grh.sgid_attr;
101 if (gid_attr) {
102 ret = rdma_read_gid_l2_fields(gid_attr, &vlan_tag,
103 &ah->av.eth.s_mac[0]);
104 if (ret)
105 return ret;
106
107 ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr);
108 if (ret < 0)
109 return ret;
110 ah->av.eth.gid_index = ret;
111 } else {
112 /* mlx4_ib_create_ah_slave fills in the s_mac and the vlan */
113 ah->av.eth.gid_index = ah_attr->grh.sgid_index;
114 }
115
116 if (vlan_tag < 0x1000)
117 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
118 ah->av.eth.port_pd = cpu_to_be32(to_mpd(ib_ah->pd)->pdn |
119 (rdma_ah_get_port_num(ah_attr) << 24));
120 ah->av.eth.vlan = cpu_to_be16(vlan_tag);
121 ah->av.eth.hop_limit = grh->hop_limit;
122 if (rdma_ah_get_static_rate(ah_attr)) {
123 ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) +
124 MLX4_STAT_RATE_OFFSET;
125 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
126 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
127 --ah->av.eth.stat_rate;
128 }
129 ah->av.eth.sl_tclass_flowlabel |=
130 cpu_to_be32((grh->traffic_class << 20) |
131 grh->flow_label);
132 /*
133 * HW requires multicast LID so we just choose one.
134 */
135 if (is_mcast)
136 ah->av.ib.dlid = cpu_to_be16(0xc000);
137
138 memcpy(ah->av.eth.dgid, grh->dgid.raw, 16);
139 ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr)
140 << 29);
141 return 0;
142 }
143
mlx4_ib_create_ah(struct ib_ah * ib_ah,struct rdma_ah_init_attr * init_attr,struct ib_udata * udata)144 int mlx4_ib_create_ah(struct ib_ah *ib_ah, struct rdma_ah_init_attr *init_attr,
145 struct ib_udata *udata)
146 {
147 struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
148
149 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
150 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
151 return -EINVAL;
152 /*
153 * TBD: need to handle the case when we get
154 * called in an atomic context and there we
155 * might sleep. We don't expect this
156 * currently since we're working with link
157 * local addresses which we can translate
158 * without going to sleep.
159 */
160 return create_iboe_ah(ib_ah, ah_attr);
161 }
162
163 create_ib_ah(ib_ah, ah_attr);
164 return 0;
165 }
166
mlx4_ib_create_ah_slave(struct ib_ah * ah,struct rdma_ah_attr * ah_attr,int slave_sgid_index,u8 * s_mac,u16 vlan_tag)167 int mlx4_ib_create_ah_slave(struct ib_ah *ah, struct rdma_ah_attr *ah_attr,
168 int slave_sgid_index, u8 *s_mac, u16 vlan_tag)
169 {
170 struct rdma_ah_attr slave_attr = *ah_attr;
171 struct rdma_ah_init_attr init_attr = {};
172 struct mlx4_ib_ah *mah = to_mah(ah);
173 int ret;
174
175 slave_attr.grh.sgid_attr = NULL;
176 slave_attr.grh.sgid_index = slave_sgid_index;
177 init_attr.ah_attr = &slave_attr;
178 ret = mlx4_ib_create_ah(ah, &init_attr, NULL);
179 if (ret)
180 return ret;
181
182 ah->type = ah_attr->type;
183
184 /* get rid of force-loopback bit */
185 mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF);
186
187 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE)
188 memcpy(mah->av.eth.s_mac, s_mac, 6);
189
190 if (vlan_tag < 0x1000)
191 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
192 mah->av.eth.vlan = cpu_to_be16(vlan_tag);
193
194 return 0;
195 }
196
mlx4_ib_query_ah(struct ib_ah * ibah,struct rdma_ah_attr * ah_attr)197 int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
198 {
199 struct mlx4_ib_ah *ah = to_mah(ibah);
200 int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
201
202 memset(ah_attr, 0, sizeof *ah_attr);
203 ah_attr->type = ibah->type;
204
205 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
206 rdma_ah_set_dlid(ah_attr, 0);
207 rdma_ah_set_sl(ah_attr,
208 be32_to_cpu(ah->av.eth.sl_tclass_flowlabel)
209 >> 29);
210 } else {
211 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid));
212 rdma_ah_set_sl(ah_attr,
213 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel)
214 >> 28);
215 }
216
217 rdma_ah_set_port_num(ah_attr, port_num);
218 if (ah->av.ib.stat_rate)
219 rdma_ah_set_static_rate(ah_attr,
220 ah->av.ib.stat_rate -
221 MLX4_STAT_RATE_OFFSET);
222 rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F);
223 if (mlx4_ib_ah_grh_present(ah)) {
224 u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel);
225
226 rdma_ah_set_grh(ah_attr, NULL,
227 tc_fl & 0xfffff, ah->av.ib.gid_index,
228 ah->av.ib.hop_limit,
229 tc_fl >> 20);
230 rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid);
231 }
232
233 return 0;
234 }
235