2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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>
39 #include <linux/slab.h>
40 #include <linux/string.h>
41 #include <linux/etherdevice.h>
45 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
46 struct mlx4_ib_ah *ah)
48 struct mlx4_dev *dev = to_mdev(pd->device)->dev;
50 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
51 ah->av.ib.g_slid = ah_attr->src_path_bits;
52 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
53 if (ah_attr->ah_flags & IB_AH_GRH) {
54 ah->av.ib.g_slid |= 0x80;
55 ah->av.ib.gid_index = ah_attr->grh.sgid_index;
56 ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
57 ah->av.ib.sl_tclass_flowlabel |=
58 cpu_to_be32((ah_attr->grh.traffic_class << 20) |
59 ah_attr->grh.flow_label);
60 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
63 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid);
64 if (ah_attr->static_rate) {
65 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
66 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
67 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
68 --ah->av.ib.stat_rate;
74 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
75 struct mlx4_ib_ah *ah)
77 struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
78 struct mlx4_dev *dev = ibdev->dev;
81 u16 vlan_tag = 0xffff;
83 struct ib_gid_attr gid_attr;
86 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof(in6));
87 if (rdma_is_multicast_addr(&in6)) {
89 rdma_get_mcast_mac(&in6, ah->av.eth.mac);
91 memcpy(ah->av.eth.mac, ah_attr->dmac, ETH_ALEN);
93 ret = ib_get_cached_gid(pd->device, ah_attr->port_num,
94 ah_attr->grh.sgid_index, &sgid, &gid_attr);
97 eth_zero_addr(ah->av.eth.s_mac);
99 if (is_vlan_dev(gid_attr.ndev))
100 vlan_tag = vlan_dev_vlan_id(gid_attr.ndev);
101 memcpy(ah->av.eth.s_mac, IF_LLADDR(gid_attr.ndev), ETH_ALEN);
102 dev_put(gid_attr.ndev);
104 if (vlan_tag < 0x1000)
105 vlan_tag |= (ah_attr->sl & 7) << 13;
106 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
107 ret = mlx4_ib_gid_index_to_real_index(ibdev, ah_attr->port_num, ah_attr->grh.sgid_index);
110 ah->av.eth.gid_index = ret;
111 ah->av.eth.vlan = cpu_to_be16(vlan_tag);
112 ah->av.eth.hop_limit = ah_attr->grh.hop_limit;
113 if (ah_attr->static_rate) {
114 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
115 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
116 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
117 --ah->av.eth.stat_rate;
121 * HW requires multicast LID so we just choose one.
124 ah->av.ib.dlid = cpu_to_be16(0xc000);
126 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
127 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);
132 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
133 struct ib_udata *udata)
136 struct mlx4_ib_ah *ah;
139 ah = kzalloc(sizeof *ah, GFP_ATOMIC);
141 return ERR_PTR(-ENOMEM);
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);
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.
155 ret = create_iboe_ah(pd, ah_attr, ah);
163 return create_ib_ah(pd, ah_attr, ah); /* never fails */
166 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
168 struct mlx4_ib_ah *ah = to_mah(ibah);
169 enum rdma_link_layer ll;
171 memset(ah_attr, 0, sizeof *ah_attr);
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 if (ll == IB_LINK_LAYER_ETHERNET)
175 ah_attr->sl = be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) >> 29;
177 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
179 ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
180 if (ah->av.ib.stat_rate)
181 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
182 ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
184 if (mlx4_ib_ah_grh_present(ah)) {
185 ah_attr->ah_flags = IB_AH_GRH;
187 ah_attr->grh.traffic_class =
188 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
189 ah_attr->grh.flow_label =
190 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
191 ah_attr->grh.hop_limit = ah->av.ib.hop_limit;
192 ah_attr->grh.sgid_index = ah->av.ib.gid_index;
193 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
199 int mlx4_ib_destroy_ah(struct ib_ah *ah)