mlx4_ib_ah.c revision 331769
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 45static 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 74static 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 if (is_vlan_dev(gid_attr.ndev)) 100 vlan_tag = vlan_dev_vlan_id(gid_attr.ndev); 101 memcpy(ah->av.eth.s_mac, IF_LLADDR(gid_attr.ndev), ETH_ALEN); 102 dev_put(gid_attr.ndev); 103 } 104 if (vlan_tag < 0x1000) 105 vlan_tag |= (ah_attr->sl & 7) << 13; 106 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24)); 107 ret = mlx4_ib_gid_index_to_real_index(ibdev, ah_attr->port_num, ah_attr->grh.sgid_index); 108 if (ret < 0) 109 return ERR_PTR(ret); 110 ah->av.eth.gid_index = ret; 111 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 112 ah->av.eth.hop_limit = ah_attr->grh.hop_limit; 113 if (ah_attr->static_rate) { 114 ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET; 115 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 116 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 117 --ah->av.eth.stat_rate; 118 } 119 120 /* 121 * HW requires multicast LID so we just choose one. 122 */ 123 if (is_mcast) 124 ah->av.ib.dlid = cpu_to_be16(0xc000); 125 126 memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16); 127 ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29); 128 129 return &ah->ibah; 130} 131 132struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr) 133{ 134 struct mlx4_ib_ah *ah; 135 struct ib_ah *ret; 136 137 ah = kzalloc(sizeof *ah, GFP_ATOMIC); 138 if (!ah) 139 return ERR_PTR(-ENOMEM); 140 141 if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) { 142 if (!(ah_attr->ah_flags & IB_AH_GRH)) { 143 ret = ERR_PTR(-EINVAL); 144 } else { 145 /* 146 * TBD: need to handle the case when we get 147 * called in an atomic context and there we 148 * might sleep. We don't expect this 149 * currently since we're working with link 150 * local addresses which we can translate 151 * without going to sleep. 152 */ 153 ret = create_iboe_ah(pd, ah_attr, ah); 154 } 155 156 if (IS_ERR(ret)) 157 kfree(ah); 158 159 return ret; 160 } else 161 return create_ib_ah(pd, ah_attr, ah); /* never fails */ 162} 163 164int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr) 165{ 166 struct mlx4_ib_ah *ah = to_mah(ibah); 167 enum rdma_link_layer ll; 168 169 memset(ah_attr, 0, sizeof *ah_attr); 170 ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 171 ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num); 172 if (ll == IB_LINK_LAYER_ETHERNET) 173 ah_attr->sl = be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) >> 29; 174 else 175 ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 176 177 ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0; 178 if (ah->av.ib.stat_rate) 179 ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET; 180 ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F; 181 182 if (mlx4_ib_ah_grh_present(ah)) { 183 ah_attr->ah_flags = IB_AH_GRH; 184 185 ah_attr->grh.traffic_class = 186 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20; 187 ah_attr->grh.flow_label = 188 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff; 189 ah_attr->grh.hop_limit = ah->av.ib.hop_limit; 190 ah_attr->grh.sgid_index = ah->av.ib.gid_index; 191 memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16); 192 } 193 194 return 0; 195} 196 197int mlx4_ib_destroy_ah(struct ib_ah *ah) 198{ 199 kfree(to_mah(ah)); 200 return 0; 201} 202