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 42 #include "mlx4_ib.h" 43 44 int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr, 45 u8 *mac, int *is_mcast, u8 port) 46 { 47 struct in6_addr in6; 48 49 *is_mcast = 0; 50 51 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6); 52 if (rdma_link_local_addr(&in6)) 53 rdma_get_ll_mac(&in6, mac); 54 else if (rdma_is_multicast_addr(&in6)) { 55 rdma_get_mcast_mac(&in6, mac); 56 *is_mcast = 1; 57 } else 58 return -EINVAL; 59 60 return 0; 61 } 62 63 static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 64 struct mlx4_ib_ah *ah) 65 { 66 struct mlx4_dev *dev = to_mdev(pd->device)->dev; 67 68 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 69 ah->av.ib.g_slid = ah_attr->src_path_bits; 70 if (ah_attr->ah_flags & IB_AH_GRH) { 71 ah->av.ib.g_slid |= 0x80; 72 ah->av.ib.gid_index = ah_attr->grh.sgid_index; 73 ah->av.ib.hop_limit = ah_attr->grh.hop_limit; 74 ah->av.ib.sl_tclass_flowlabel |= 75 cpu_to_be32((ah_attr->grh.traffic_class << 20) | 76 ah_attr->grh.flow_label); 77 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16); 78 } 79 80 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid); 81 if (ah_attr->static_rate) { 82 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 83 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 84 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support)) 85 --ah->av.ib.stat_rate; 86 } 87 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28); 88 89 return &ah->ibah; 90 } 91 92 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 93 struct mlx4_ib_ah *ah) 94 { 95 struct mlx4_ib_dev *ibdev = to_mdev(pd->device); 96 struct mlx4_dev *dev = ibdev->dev; 97 int is_mcast = 0; 98 struct in6_addr in6; 99 u16 vlan_tag; 100 101 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof(in6)); 102 if (rdma_is_multicast_addr(&in6)) { 103 is_mcast = 1; 104 resolve_mcast_mac(&in6, ah->av.eth.mac); 105 } else { 106 memcpy(ah->av.eth.mac, ah_attr->dmac, 6); 107 } 108 vlan_tag = ah_attr->vlan_id; 109 if (vlan_tag < 0x1000) 110 vlan_tag |= (ah_attr->sl & 7) << 13; 111 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 112 ah->av.eth.gid_index = ah_attr->grh.sgid_index; 113 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 114 if (ah_attr->static_rate) { 115 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 116 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 117 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 118 --ah->av.eth.stat_rate; 119 } 120 121 /* 122 * HW requires multicast LID so we just choose one. 123 */ 124 if (is_mcast) 125 ah->av.ib.dlid = cpu_to_be16(0xc000); 126 127 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16); 128 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29); 129 130 return &ah->ibah; 131 } 132 133 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr) 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->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 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 ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0; 175 if (ah->av.ib.stat_rate) 176 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET; 177 ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F; 178 179 if (mlx4_ib_ah_grh_present(ah)) { 180 ah_attr->ah_flags = IB_AH_GRH; 181 182 ah_attr->grh.traffic_class = 183 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20; 184 ah_attr->grh.flow_label = 185 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff; 186 ah_attr->grh.hop_limit = ah->av.ib.hop_limit; 187 ah_attr->grh.sgid_index = ah->av.ib.gid_index; 188 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16); 189 } 190 191 return 0; 192 } 193 194 int mlx4_ib_destroy_ah(struct ib_ah *ah) 195 { 196 kfree(to_mah(ah)); 197 return 0; 198 } 199