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 40 #include "mlx4_ib.h" 41 42 int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr, 43 u8 *mac, int *is_mcast, u8 port) 44 { 45 struct in6_addr in6; 46 47 *is_mcast = 0; 48 49 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6); 50 if (rdma_link_local_addr(&in6)) 51 rdma_get_ll_mac(&in6, mac); 52 else if (rdma_is_multicast_addr(&in6)) { 53 rdma_get_mcast_mac(&in6, mac); 54 *is_mcast = 1; 55 } else 56 return -EINVAL; 57 58 return 0; 59 } 60 61 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 62 struct mlx4_ib_ah *ah) 63 { 64 struct mlx4_dev *dev = to_mdev(pd->device)->dev; 65 66 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 67 ah->av.ib.g_slid = ah_attr->src_path_bits; 68 if (ah_attr->ah_flags & IB_AH_GRH) { 69 ah->av.ib.g_slid |= 0x80; 70 ah->av.ib.gid_index = ah_attr->grh.sgid_index; 71 ah->av.ib.hop_limit = ah_attr->grh.hop_limit; 72 ah->av.ib.sl_tclass_flowlabel |= 73 cpu_to_be32((ah_attr->grh.traffic_class << 20) | 74 ah_attr->grh.flow_label); 75 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16); 76 } 77 78 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid); 79 if (ah_attr->static_rate) { 80 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 81 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 82 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support)) 83 --ah->av.ib.stat_rate; 84 } 85 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28); 86 87 return &ah->ibah; 88 } 89 90 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 91 struct mlx4_ib_ah *ah) 92 { 93 struct mlx4_ib_dev *ibdev = to_mdev(pd->device); 94 struct mlx4_dev *dev = ibdev->dev; 95 union ib_gid sgid; 96 u8 mac[6]; 97 int err; 98 int is_mcast; 99 u16 vlan_tag; 100 101 err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num); 102 if (err) 103 return ERR_PTR(err); 104 105 memcpy(ah->av.eth.mac, mac, 6); 106 err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid); 107 if (err) 108 return ERR_PTR(err); 109 vlan_tag = rdma_get_vlan_id(&sgid); 110 if (vlan_tag < 0x1000) 111 vlan_tag |= (ah_attr->sl & 7) << 13; 112 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 113 ah->av.eth.gid_index = ah_attr->grh.sgid_index; 114 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 115 if (ah_attr->static_rate) { 116 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 117 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 118 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 119 --ah->av.eth.stat_rate; 120 } 121 122 /* 123 * HW requires multicast LID so we just choose one. 124 */ 125 if (is_mcast) 126 ah->av.ib.dlid = cpu_to_be16(0xc000); 127 128 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16); 129 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29); 130 131 return &ah->ibah; 132 } 133 134 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr) 135 { 136 struct mlx4_ib_ah *ah; 137 struct ib_ah *ret; 138 139 ah = kzalloc(sizeof *ah, GFP_ATOMIC); 140 if (!ah) 141 return ERR_PTR(-ENOMEM); 142 143 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); 146 } else { 147 /* 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. 154 */ 155 ret = create_iboe_ah(pd, ah_attr, ah); 156 } 157 158 if (IS_ERR(ret)) 159 kfree(ah); 160 161 return ret; 162 } else 163 return create_ib_ah(pd, ah_attr, ah); /* never fails */ 164 } 165 166 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr) 167 { 168 struct mlx4_ib_ah *ah = to_mah(ibah); 169 enum rdma_link_layer ll; 170 171 memset(ah_attr, 0, sizeof *ah_attr); 172 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 173 ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 174 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num); 175 ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0; 176 if (ah->av.ib.stat_rate) 177 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET; 178 ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F; 179 180 if (mlx4_ib_ah_grh_present(ah)) { 181 ah_attr->ah_flags = IB_AH_GRH; 182 183 ah_attr->grh.traffic_class = 184 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20; 185 ah_attr->grh.flow_label = 186 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff; 187 ah_attr->grh.hop_limit = ah->av.ib.hop_limit; 188 ah_attr->grh.sgid_index = ah->av.ib.gid_index; 189 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16); 190 } 191 192 return 0; 193 } 194 195 int mlx4_ib_destroy_ah(struct ib_ah *ah) 196 { 197 kfree(to_mah(ah)); 198 return 0; 199 } 200