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
43static struct ib_ah *create_ib_ah(struct ib_pd *pd,
44 struct rdma_ah_attr *ah_attr,
45 struct mlx4_ib_ah *ah)
46{
47 struct mlx4_dev *dev = to_mdev(pd->device)->dev;
48
49 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn |
50 (rdma_ah_get_port_num(ah_attr) << 24));
51 ah->av.ib.g_slid = rdma_ah_get_path_bits(ah_attr);
52 ah->av.ib.sl_tclass_flowlabel =
53 cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28);
54 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
55 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
56
57 ah->av.ib.g_slid |= 0x80;
58 ah->av.ib.gid_index = grh->sgid_index;
59 ah->av.ib.hop_limit = grh->hop_limit;
60 ah->av.ib.sl_tclass_flowlabel |=
61 cpu_to_be32((grh->traffic_class << 20) |
62 grh->flow_label);
63 memcpy(ah->av.ib.dgid, grh->dgid.raw, 16);
64 }
65
66 ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
67 if (rdma_ah_get_static_rate(ah_attr)) {
68 u8 static_rate = rdma_ah_get_static_rate(ah_attr) +
69 MLX4_STAT_RATE_OFFSET;
70
71 while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
72 !(1 << static_rate & dev->caps.stat_rate_support))
73 --static_rate;
74 ah->av.ib.stat_rate = static_rate;
75 }
76
77 return &ah->ibah;
78}
79
80static struct ib_ah *create_iboe_ah(struct ib_pd *pd,
81 struct rdma_ah_attr *ah_attr,
82 struct mlx4_ib_ah *ah)
83{
84 struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
85 const struct ib_gid_attr *gid_attr;
86 struct mlx4_dev *dev = ibdev->dev;
87 int is_mcast = 0;
88 struct in6_addr in6;
89 u16 vlan_tag = 0xffff;
90 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
91 int ret;
92
93 memcpy(&in6, grh->dgid.raw, sizeof(in6));
94 if (rdma_is_multicast_addr(&in6))
95 is_mcast = 1;
96
97 memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN);
98 eth_zero_addr(ah->av.eth.s_mac);
99
100 /*
101 * If sgid_attr is NULL we are being called by mlx4_ib_create_ah_slave
102 * and we are directly creating an AV for a slave's gid_index.
103 */
104 gid_attr = ah_attr->grh.sgid_attr;
105 if (gid_attr) {
106 if (is_vlan_dev(gid_attr->ndev))
107 vlan_tag = vlan_dev_vlan_id(gid_attr->ndev);
108 memcpy(ah->av.eth.s_mac, gid_attr->ndev->dev_addr, ETH_ALEN);
109 ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr);
110 if (ret < 0)
111 return ERR_PTR(ret);
112 ah->av.eth.gid_index = ret;
113 } else {
114 /* mlx4_ib_create_ah_slave fills in the s_mac and the vlan */
115 ah->av.eth.gid_index = ah_attr->grh.sgid_index;
116 }
117
118 if (vlan_tag < 0x1000)
119 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
120 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn |
121 (rdma_ah_get_port_num(ah_attr) << 24));
122 ah->av.eth.vlan = cpu_to_be16(vlan_tag);
123 ah->av.eth.hop_limit = grh->hop_limit;
124 if (rdma_ah_get_static_rate(ah_attr)) {
125 ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) +
126 MLX4_STAT_RATE_OFFSET;
127 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
128 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
129 --ah->av.eth.stat_rate;
130 }
131 ah->av.eth.sl_tclass_flowlabel |=
132 cpu_to_be32((grh->traffic_class << 20) |
133 grh->flow_label);
134 /*
135 * HW requires multicast LID so we just choose one.
136 */
137 if (is_mcast)
138 ah->av.ib.dlid = cpu_to_be16(0xc000);
139
140 memcpy(ah->av.eth.dgid, grh->dgid.raw, 16);
141 ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr)
142 << 29);
143 return &ah->ibah;
144}
145
146struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
147 u32 flags, struct ib_udata *udata)
148
149{
150 struct mlx4_ib_ah *ah;
151 struct ib_ah *ret;
152
153 ah = kzalloc(sizeof *ah, GFP_ATOMIC);
154 if (!ah)
155 return ERR_PTR(-ENOMEM);
156
157 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
158 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) {
159 ret = ERR_PTR(-EINVAL);
160 } else {
161 /*
162 * TBD: need to handle the case when we get
163 * called in an atomic context and there we
164 * might sleep. We don't expect this
165 * currently since we're working with link
166 * local addresses which we can translate
167 * without going to sleep.
168 */
169 ret = create_iboe_ah(pd, ah_attr, ah);
170 }
171
172 if (IS_ERR(ret))
173 kfree(ah);
174
175 return ret;
176 } else
177 return create_ib_ah(pd, ah_attr, ah); /* never fails */
178}
179
180/* AH's created via this call must be free'd by mlx4_ib_destroy_ah. */
181struct ib_ah *mlx4_ib_create_ah_slave(struct ib_pd *pd,
182 struct rdma_ah_attr *ah_attr,
183 int slave_sgid_index, u8 *s_mac,
184 u16 vlan_tag)
185{
186 struct rdma_ah_attr slave_attr = *ah_attr;
187 struct mlx4_ib_ah *mah;
188 struct ib_ah *ah;
189
190 slave_attr.grh.sgid_attr = NULL;
191 slave_attr.grh.sgid_index = slave_sgid_index;
192 ah = mlx4_ib_create_ah(pd, &slave_attr, 0, NULL);
193 if (IS_ERR(ah))
194 return ah;
195
196 ah->device = pd->device;
197 ah->pd = pd;
198 ah->type = ah_attr->type;
199 mah = to_mah(ah);
200
201 /* get rid of force-loopback bit */
202 mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF);
203
204 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE)
205 memcpy(mah->av.eth.s_mac, s_mac, 6);
206
207 if (vlan_tag < 0x1000)
208 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
209 mah->av.eth.vlan = cpu_to_be16(vlan_tag);
210
211 return ah;
212}
213
214int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
215{
216 struct mlx4_ib_ah *ah = to_mah(ibah);
217 int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
218
219 memset(ah_attr, 0, sizeof *ah_attr);
220 ah_attr->type = ibah->type;
221
222 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
223 rdma_ah_set_dlid(ah_attr, 0);
224 rdma_ah_set_sl(ah_attr,
225 be32_to_cpu(ah->av.eth.sl_tclass_flowlabel)
226 >> 29);
227 } else {
228 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid));
229 rdma_ah_set_sl(ah_attr,
230 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel)
231 >> 28);
232 }
233
234 rdma_ah_set_port_num(ah_attr, port_num);
235 if (ah->av.ib.stat_rate)
236 rdma_ah_set_static_rate(ah_attr,
237 ah->av.ib.stat_rate -
238 MLX4_STAT_RATE_OFFSET);
239 rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F);
240 if (mlx4_ib_ah_grh_present(ah)) {
241 u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel);
242
243 rdma_ah_set_grh(ah_attr, NULL,
244 tc_fl & 0xfffff, ah->av.ib.gid_index,
245 ah->av.ib.hop_limit,
246 tc_fl >> 20);
247 rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid);
248 }
249
250 return 0;
251}
252
253int mlx4_ib_destroy_ah(struct ib_ah *ah, u32 flags)
254{
255 kfree(to_mah(ah));
256 return 0;
257}
258