ah.c revision 273246
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 34#include <sys/types.h> 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <rdma/ib_addr.h> 38#include <rdma/ib_cache.h> 39 40#include <linux/slab.h> 41#include <linux/string.h> 42 43#include "mlx4_ib.h" 44 45int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr, 46 u8 *mac, int *is_mcast, u8 port) 47{ 48 struct in6_addr in6; 49 50 *is_mcast = 0; 51 52 memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6); 53 if (rdma_link_local_addr(&in6)) 54 rdma_get_ll_mac(&in6, mac); 55 else if (rdma_is_multicast_addr(&in6)) { 56 rdma_get_mcast_mac(&in6, mac); 57 *is_mcast = 1; 58 } else 59 return -EINVAL; 60 61 return 0; 62} 63 64static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 65 struct mlx4_ib_ah *ah) 66{ 67 struct mlx4_dev *dev = to_mdev(pd->device)->dev; 68 69 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 70 ah->av.ib.g_slid = ah_attr->src_path_bits; 71 if (ah_attr->ah_flags & IB_AH_GRH) { 72 ah->av.ib.g_slid |= 0x80; 73 ah->av.ib.gid_index = ah_attr->grh.sgid_index; 74 ah->av.ib.hop_limit = ah_attr->grh.hop_limit; 75 ah->av.ib.sl_tclass_flowlabel |= 76 cpu_to_be32((ah_attr->grh.traffic_class << 20) | 77 ah_attr->grh.flow_label); 78 memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16); 79 } 80 81 ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid); 82 if (ah_attr->static_rate) { 83 ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 84 while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 85 !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support)) 86 --ah->av.ib.stat_rate; 87 } 88 ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28); 89 90 return &ah->ibah; 91} 92 93static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 94 struct mlx4_ib_ah *ah) 95{ 96 struct mlx4_ib_dev *ibdev = to_mdev(pd->device); 97 struct mlx4_dev *dev = ibdev->dev; 98 union ib_gid sgid; 99 u8 mac[6]; 100 int err; 101 int is_mcast; 102 u16 vlan_tag; 103 104 err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num); 105 if (err) 106 return ERR_PTR(err); 107 108 memcpy(ah->av.eth.mac, mac, 6); 109 err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid); 110 if (err) 111 return ERR_PTR(err); 112 vlan_tag = rdma_get_vlan_id(&sgid); 113 if (vlan_tag < 0x1000) 114 vlan_tag |= (ah_attr->sl & 7) << 13; 115 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 116 ah->av.eth.gid_index = ah_attr->grh.sgid_index; 117 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 118 if (ah_attr->static_rate) { 119 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 120 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 121 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 122 --ah->av.eth.stat_rate; 123 } 124 125 /* 126 * HW requires multicast LID so we just choose one. 127 */ 128 if (is_mcast) 129 ah->av.ib.dlid = cpu_to_be16(0xc000); 130 131 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16); 132 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29); 133 134 return &ah->ibah; 135} 136 137struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr) 138{ 139 struct mlx4_ib_ah *ah; 140 struct ib_ah *ret; 141 142 ah = kzalloc(sizeof *ah, GFP_ATOMIC); 143 if (!ah) 144 return ERR_PTR(-ENOMEM); 145 146 if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) { 147 if (!(ah_attr->ah_flags & IB_AH_GRH)) { 148 ret = ERR_PTR(-EINVAL); 149 } else { 150 /* 151 * TBD: need to handle the case when we get 152 * called in an atomic context and there we 153 * might sleep. We don't expect this 154 * currently since we're working with link 155 * local addresses which we can translate 156 * without going to sleep. 157 */ 158 ret = create_iboe_ah(pd, ah_attr, ah); 159 } 160 161 if (IS_ERR(ret)) 162 kfree(ah); 163 164 return ret; 165 } else 166 return create_ib_ah(pd, ah_attr, ah); /* never fails */ 167} 168 169int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr) 170{ 171 struct mlx4_ib_ah *ah = to_mah(ibah); 172 enum rdma_link_layer ll; 173 174 memset(ah_attr, 0, sizeof *ah_attr); 175 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 176 ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 177 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num); 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 198int mlx4_ib_destroy_ah(struct ib_ah *ah) 199{ 200 kfree(to_mah(ah)); 201 return 0; 202} 203