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 43 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 44 struct mlx4_ib_ah *ah) 45 { 46 struct mlx4_dev *dev = to_mdev(pd->device)->dev; 47 48 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 49 ah->av.ib.g_slid = ah_attr->src_path_bits; 50 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28); 51 if (ah_attr->ah_flags & IB_AH_GRH) { 52 ah->av.ib.g_slid |= 0x80; 53 ah->av.ib.gid_index = ah_attr->grh.sgid_index; 54 ah->av.ib.hop_limit = ah_attr->grh.hop_limit; 55 ah->av.ib.sl_tclass_flowlabel |= 56 cpu_to_be32((ah_attr->grh.traffic_class << 20) | 57 ah_attr->grh.flow_label); 58 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16); 59 } 60 61 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid); 62 if (ah_attr->static_rate) { 63 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 64 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 65 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support)) 66 --ah->av.ib.stat_rate; 67 } 68 69 return &ah->ibah; 70 } 71 72 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 73 struct mlx4_ib_ah *ah) 74 { 75 struct mlx4_ib_dev *ibdev = to_mdev(pd->device); 76 struct mlx4_dev *dev = ibdev->dev; 77 int is_mcast = 0; 78 struct in6_addr in6; 79 u16 vlan_tag = 0xffff; 80 union ib_gid sgid; 81 struct ib_gid_attr gid_attr; 82 int ret; 83 84 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof(in6)); 85 if (rdma_is_multicast_addr(&in6)) { 86 is_mcast = 1; 87 rdma_get_mcast_mac(&in6, ah->av.eth.mac); 88 } else { 89 memcpy(ah->av.eth.mac, ah_attr->dmac, ETH_ALEN); 90 } 91 ret = ib_get_cached_gid(pd->device, ah_attr->port_num, 92 ah_attr->grh.sgid_index, &sgid, &gid_attr); 93 if (ret) 94 return ERR_PTR(ret); 95 eth_zero_addr(ah->av.eth.s_mac); 96 if (gid_attr.ndev) { 97 if (is_vlan_dev(gid_attr.ndev)) 98 vlan_tag = vlan_dev_vlan_id(gid_attr.ndev); 99 memcpy(ah->av.eth.s_mac, gid_attr.ndev->dev_addr, ETH_ALEN); 100 dev_put(gid_attr.ndev); 101 } 102 if (vlan_tag < 0x1000) 103 vlan_tag |= (ah_attr->sl & 7) << 13; 104 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 105 ret = mlx4_ib_gid_index_to_real_index(ibdev, ah_attr->port_num, ah_attr->grh.sgid_index); 106 if (ret < 0) 107 return ERR_PTR(ret); 108 ah->av.eth.gid_index = ret; 109 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 110 ah->av.eth.hop_limit = ah_attr->grh.hop_limit; 111 if (ah_attr->static_rate) { 112 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 113 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 114 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 115 --ah->av.eth.stat_rate; 116 } 117 118 /* 119 * HW requires multicast LID so we just choose one. 120 */ 121 if (is_mcast) 122 ah->av.ib.dlid = cpu_to_be16(0xc000); 123 124 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16); 125 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29); 126 127 return &ah->ibah; 128 } 129 130 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr) 131 { 132 struct mlx4_ib_ah *ah; 133 struct ib_ah *ret; 134 135 ah = kzalloc(sizeof *ah, GFP_ATOMIC); 136 if (!ah) 137 return ERR_PTR(-ENOMEM); 138 139 if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) { 140 if (!(ah_attr->ah_flags & IB_AH_GRH)) { 141 ret = ERR_PTR(-EINVAL); 142 } else { 143 /* 144 * TBD: need to handle the case when we get 145 * called in an atomic context and there we 146 * might sleep. We don't expect this 147 * currently since we're working with link 148 * local addresses which we can translate 149 * without going to sleep. 150 */ 151 ret = create_iboe_ah(pd, ah_attr, ah); 152 } 153 154 if (IS_ERR(ret)) 155 kfree(ah); 156 157 return ret; 158 } else 159 return create_ib_ah(pd, ah_attr, ah); /* never fails */ 160 } 161 162 int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr) 163 { 164 struct mlx4_ib_ah *ah = to_mah(ibah); 165 enum rdma_link_layer ll; 166 167 memset(ah_attr, 0, sizeof *ah_attr); 168 ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 169 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num); 170 if (ll == IB_LINK_LAYER_ETHERNET) 171 ah_attr->sl = be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) >> 29; 172 else 173 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 174 175 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