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 void create_ib_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr) 44 { 45 struct mlx4_ib_ah *ah = to_mah(ib_ah); 46 struct mlx4_dev *dev = to_mdev(ib_ah->device)->dev; 47 48 ah->av.ib.port_pd = cpu_to_be32(to_mpd(ib_ah->pd)->pdn | 49 (rdma_ah_get_port_num(ah_attr) << 24)); 50 ah->av.ib.g_slid = rdma_ah_get_path_bits(ah_attr); 51 ah->av.ib.sl_tclass_flowlabel = 52 cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28); 53 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 54 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); 55 56 ah->av.ib.g_slid |= 0x80; 57 ah->av.ib.gid_index = grh->sgid_index; 58 ah->av.ib.hop_limit = grh->hop_limit; 59 ah->av.ib.sl_tclass_flowlabel |= 60 cpu_to_be32((grh->traffic_class << 20) | 61 grh->flow_label); 62 memcpy(ah->av.ib.dgid, grh->dgid.raw, 16); 63 } 64 65 ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr)); 66 if (rdma_ah_get_static_rate(ah_attr)) { 67 u8 static_rate = rdma_ah_get_static_rate(ah_attr) + 68 MLX4_STAT_RATE_OFFSET; 69 70 while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 71 !(1 << static_rate & dev->caps.stat_rate_support)) 72 --static_rate; 73 ah->av.ib.stat_rate = static_rate; 74 } 75 } 76 77 static int create_iboe_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr) 78 { 79 struct mlx4_ib_dev *ibdev = to_mdev(ib_ah->device); 80 struct mlx4_ib_ah *ah = to_mah(ib_ah); 81 const struct ib_gid_attr *gid_attr; 82 struct mlx4_dev *dev = ibdev->dev; 83 int is_mcast = 0; 84 struct in6_addr in6; 85 u16 vlan_tag = 0xffff; 86 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); 87 int ret; 88 89 memcpy(&in6, grh->dgid.raw, sizeof(in6)); 90 if (rdma_is_multicast_addr(&in6)) 91 is_mcast = 1; 92 93 memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN); 94 eth_zero_addr(ah->av.eth.s_mac); 95 96 /* 97 * If sgid_attr is NULL we are being called by mlx4_ib_create_ah_slave 98 * and we are directly creating an AV for a slave's gid_index. 99 */ 100 gid_attr = ah_attr->grh.sgid_attr; 101 if (gid_attr) { 102 ret = rdma_read_gid_l2_fields(gid_attr, &vlan_tag, 103 &ah->av.eth.s_mac[0]); 104 if (ret) 105 return ret; 106 107 ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr); 108 if (ret < 0) 109 return ret; 110 ah->av.eth.gid_index = ret; 111 } else { 112 /* mlx4_ib_create_ah_slave fills in the s_mac and the vlan */ 113 ah->av.eth.gid_index = ah_attr->grh.sgid_index; 114 } 115 116 if (vlan_tag < 0x1000) 117 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13; 118 ah->av.eth.port_pd = cpu_to_be32(to_mpd(ib_ah->pd)->pdn | 119 (rdma_ah_get_port_num(ah_attr) << 24)); 120 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 121 ah->av.eth.hop_limit = grh->hop_limit; 122 if (rdma_ah_get_static_rate(ah_attr)) { 123 ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) + 124 MLX4_STAT_RATE_OFFSET; 125 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 126 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 127 --ah->av.eth.stat_rate; 128 } 129 ah->av.eth.sl_tclass_flowlabel |= 130 cpu_to_be32((grh->traffic_class << 20) | 131 grh->flow_label); 132 /* 133 * HW requires multicast LID so we just choose one. 134 */ 135 if (is_mcast) 136 ah->av.ib.dlid = cpu_to_be16(0xc000); 137 138 memcpy(ah->av.eth.dgid, grh->dgid.raw, 16); 139 ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr) 140 << 29); 141 return 0; 142 } 143 144 int mlx4_ib_create_ah(struct ib_ah *ib_ah, struct rdma_ah_init_attr *init_attr, 145 struct ib_udata *udata) 146 { 147 struct rdma_ah_attr *ah_attr = init_attr->ah_attr; 148 149 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { 150 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) 151 return -EINVAL; 152 /* 153 * TBD: need to handle the case when we get 154 * called in an atomic context and there we 155 * might sleep. We don't expect this 156 * currently since we're working with link 157 * local addresses which we can translate 158 * without going to sleep. 159 */ 160 return create_iboe_ah(ib_ah, ah_attr); 161 } 162 163 create_ib_ah(ib_ah, ah_attr); 164 return 0; 165 } 166 167 int mlx4_ib_create_ah_slave(struct ib_ah *ah, struct rdma_ah_attr *ah_attr, 168 int slave_sgid_index, u8 *s_mac, u16 vlan_tag) 169 { 170 struct rdma_ah_attr slave_attr = *ah_attr; 171 struct rdma_ah_init_attr init_attr = {}; 172 struct mlx4_ib_ah *mah = to_mah(ah); 173 int ret; 174 175 slave_attr.grh.sgid_attr = NULL; 176 slave_attr.grh.sgid_index = slave_sgid_index; 177 init_attr.ah_attr = &slave_attr; 178 ret = mlx4_ib_create_ah(ah, &init_attr, NULL); 179 if (ret) 180 return ret; 181 182 ah->type = ah_attr->type; 183 184 /* get rid of force-loopback bit */ 185 mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF); 186 187 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) 188 memcpy(mah->av.eth.s_mac, s_mac, 6); 189 190 if (vlan_tag < 0x1000) 191 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13; 192 mah->av.eth.vlan = cpu_to_be16(vlan_tag); 193 194 return 0; 195 } 196 197 int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 198 { 199 struct mlx4_ib_ah *ah = to_mah(ibah); 200 int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 201 202 memset(ah_attr, 0, sizeof *ah_attr); 203 ah_attr->type = ibah->type; 204 205 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { 206 rdma_ah_set_dlid(ah_attr, 0); 207 rdma_ah_set_sl(ah_attr, 208 be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) 209 >> 29); 210 } else { 211 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid)); 212 rdma_ah_set_sl(ah_attr, 213 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) 214 >> 28); 215 } 216 217 rdma_ah_set_port_num(ah_attr, port_num); 218 if (ah->av.ib.stat_rate) 219 rdma_ah_set_static_rate(ah_attr, 220 ah->av.ib.stat_rate - 221 MLX4_STAT_RATE_OFFSET); 222 rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F); 223 if (mlx4_ib_ah_grh_present(ah)) { 224 u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel); 225 226 rdma_ah_set_grh(ah_attr, NULL, 227 tc_fl & 0xfffff, ah->av.ib.gid_index, 228 ah->av.ib.hop_limit, 229 tc_fl >> 20); 230 rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid); 231 } 232 233 return 0; 234 } 235