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 #include <linux/etherdevice.h> 42 43 #include "mlx4_ib.h" 44 45 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 46 struct mlx4_ib_ah *ah) 47 { 48 struct mlx4_dev *dev = to_mdev(pd->device)->dev; 49 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); 61 } 62 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; 69 } 70 71 return &ah->ibah; 72 } 73 74 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 75 struct mlx4_ib_ah *ah) 76 { 77 struct mlx4_ib_dev *ibdev = to_mdev(pd->device); 78 struct mlx4_dev *dev = ibdev->dev; 79 int is_mcast = 0; 80 struct in6_addr in6; 81 u16 vlan_tag = 0xffff; 82 union ib_gid sgid; 83 struct ib_gid_attr gid_attr; 84 int ret; 85 86 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof(in6)); 87 if (rdma_is_multicast_addr(&in6)) { 88 is_mcast = 1; 89 rdma_get_mcast_mac(&in6, ah->av.eth.mac); 90 } else { 91 memcpy(ah->av.eth.mac, ah_attr->dmac, ETH_ALEN); 92 } 93 ret = ib_get_cached_gid(pd->device, ah_attr->port_num, 94 ah_attr->grh.sgid_index, &sgid, &gid_attr); 95 if (ret) 96 return ERR_PTR(ret); 97 eth_zero_addr(ah->av.eth.s_mac); 98 if (gid_attr.ndev) { 99 vlan_tag = rdma_vlan_dev_vlan_id(gid_attr.ndev); 100 memcpy(ah->av.eth.s_mac, IF_LLADDR(gid_attr.ndev), ETH_ALEN); 101 dev_put(gid_attr.ndev); 102 } 103 if (vlan_tag < 0x1000) 104 vlan_tag |= (ah_attr->sl & 7) << 13; 105 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 106 ret = mlx4_ib_gid_index_to_real_index(ibdev, ah_attr->port_num, ah_attr->grh.sgid_index); 107 if (ret < 0) 108 return ERR_PTR(ret); 109 ah->av.eth.gid_index = ret; 110 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 111 ah->av.eth.hop_limit = ah_attr->grh.hop_limit; 112 if (ah_attr->static_rate) { 113 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 114 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 115 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 116 --ah->av.eth.stat_rate; 117 } 118 119 /* 120 * HW requires multicast LID so we just choose one. 121 */ 122 if (is_mcast) 123 ah->av.ib.dlid = cpu_to_be16(0xc000); 124 125 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16); 126 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29); 127 128 return &ah->ibah; 129 } 130 131 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 132 struct ib_udata *udata) 133 134 { 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 } 164 165 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->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 172 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num); 173 if (ll == IB_LINK_LAYER_ETHERNET) 174 ah_attr->sl = be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) >> 29; 175 else 176 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 177 178 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 } 197 198 int mlx4_ib_destroy_ah(struct ib_ah *ah) 199 { 200 kfree(to_mah(ah)); 201 return 0; 202 } 203