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, 44 struct rdma_ah_attr *ah_attr, 45 struct mlx4_ib_ah *ah) 46 { 47 struct mlx4_dev *dev = to_mdev(pd->device)->dev; 48 49 ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | 50 (rdma_ah_get_port_num(ah_attr) << 24)); 51 ah->av.ib.g_slid = rdma_ah_get_path_bits(ah_attr); 52 ah->av.ib.sl_tclass_flowlabel = 53 cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28); 54 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 55 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); 56 57 ah->av.ib.g_slid |= 0x80; 58 ah->av.ib.gid_index = grh->sgid_index; 59 ah->av.ib.hop_limit = grh->hop_limit; 60 ah->av.ib.sl_tclass_flowlabel |= 61 cpu_to_be32((grh->traffic_class << 20) | 62 grh->flow_label); 63 memcpy(ah->av.ib.dgid, grh->dgid.raw, 16); 64 } 65 66 ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr)); 67 if (rdma_ah_get_static_rate(ah_attr)) { 68 u8 static_rate = rdma_ah_get_static_rate(ah_attr) + 69 MLX4_STAT_RATE_OFFSET; 70 71 while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 72 !(1 << static_rate & dev->caps.stat_rate_support)) 73 --static_rate; 74 ah->av.ib.stat_rate = static_rate; 75 } 76 77 return &ah->ibah; 78 } 79 80 static struct ib_ah *create_iboe_ah(struct ib_pd *pd, 81 struct rdma_ah_attr *ah_attr, 82 struct mlx4_ib_ah *ah) 83 { 84 struct mlx4_ib_dev *ibdev = to_mdev(pd->device); 85 const struct ib_gid_attr *gid_attr; 86 struct mlx4_dev *dev = ibdev->dev; 87 int is_mcast = 0; 88 struct in6_addr in6; 89 u16 vlan_tag = 0xffff; 90 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); 91 int ret; 92 93 memcpy(&in6, grh->dgid.raw, sizeof(in6)); 94 if (rdma_is_multicast_addr(&in6)) 95 is_mcast = 1; 96 97 memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN); 98 eth_zero_addr(ah->av.eth.s_mac); 99 100 /* 101 * If sgid_attr is NULL we are being called by mlx4_ib_create_ah_slave 102 * and we are directly creating an AV for a slave's gid_index. 103 */ 104 gid_attr = ah_attr->grh.sgid_attr; 105 if (gid_attr) { 106 if (is_vlan_dev(gid_attr->ndev)) 107 vlan_tag = vlan_dev_vlan_id(gid_attr->ndev); 108 memcpy(ah->av.eth.s_mac, gid_attr->ndev->dev_addr, ETH_ALEN); 109 ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr); 110 if (ret < 0) 111 return ERR_PTR(ret); 112 ah->av.eth.gid_index = ret; 113 } else { 114 /* mlx4_ib_create_ah_slave fills in the s_mac and the vlan */ 115 ah->av.eth.gid_index = ah_attr->grh.sgid_index; 116 } 117 118 if (vlan_tag < 0x1000) 119 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13; 120 ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | 121 (rdma_ah_get_port_num(ah_attr) << 24)); 122 ah->av.eth.vlan = cpu_to_be16(vlan_tag); 123 ah->av.eth.hop_limit = grh->hop_limit; 124 if (rdma_ah_get_static_rate(ah_attr)) { 125 ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) + 126 MLX4_STAT_RATE_OFFSET; 127 while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 128 !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) 129 --ah->av.eth.stat_rate; 130 } 131 ah->av.eth.sl_tclass_flowlabel |= 132 cpu_to_be32((grh->traffic_class << 20) | 133 grh->flow_label); 134 /* 135 * HW requires multicast LID so we just choose one. 136 */ 137 if (is_mcast) 138 ah->av.ib.dlid = cpu_to_be16(0xc000); 139 140 memcpy(ah->av.eth.dgid, grh->dgid.raw, 16); 141 ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr) 142 << 29); 143 return &ah->ibah; 144 } 145 146 struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr, 147 u32 flags, struct ib_udata *udata) 148 149 { 150 struct mlx4_ib_ah *ah; 151 struct ib_ah *ret; 152 153 ah = kzalloc(sizeof *ah, GFP_ATOMIC); 154 if (!ah) 155 return ERR_PTR(-ENOMEM); 156 157 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { 158 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) { 159 ret = ERR_PTR(-EINVAL); 160 } else { 161 /* 162 * TBD: need to handle the case when we get 163 * called in an atomic context and there we 164 * might sleep. We don't expect this 165 * currently since we're working with link 166 * local addresses which we can translate 167 * without going to sleep. 168 */ 169 ret = create_iboe_ah(pd, ah_attr, ah); 170 } 171 172 if (IS_ERR(ret)) 173 kfree(ah); 174 175 return ret; 176 } else 177 return create_ib_ah(pd, ah_attr, ah); /* never fails */ 178 } 179 180 /* AH's created via this call must be free'd by mlx4_ib_destroy_ah. */ 181 struct ib_ah *mlx4_ib_create_ah_slave(struct ib_pd *pd, 182 struct rdma_ah_attr *ah_attr, 183 int slave_sgid_index, u8 *s_mac, 184 u16 vlan_tag) 185 { 186 struct rdma_ah_attr slave_attr = *ah_attr; 187 struct mlx4_ib_ah *mah; 188 struct ib_ah *ah; 189 190 slave_attr.grh.sgid_attr = NULL; 191 slave_attr.grh.sgid_index = slave_sgid_index; 192 ah = mlx4_ib_create_ah(pd, &slave_attr, 0, NULL); 193 if (IS_ERR(ah)) 194 return ah; 195 196 ah->device = pd->device; 197 ah->pd = pd; 198 ah->type = ah_attr->type; 199 mah = to_mah(ah); 200 201 /* get rid of force-loopback bit */ 202 mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF); 203 204 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) 205 memcpy(mah->av.eth.s_mac, s_mac, 6); 206 207 if (vlan_tag < 0x1000) 208 vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13; 209 mah->av.eth.vlan = cpu_to_be16(vlan_tag); 210 211 return ah; 212 } 213 214 int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 215 { 216 struct mlx4_ib_ah *ah = to_mah(ibah); 217 int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; 218 219 memset(ah_attr, 0, sizeof *ah_attr); 220 ah_attr->type = ibah->type; 221 222 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { 223 rdma_ah_set_dlid(ah_attr, 0); 224 rdma_ah_set_sl(ah_attr, 225 be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) 226 >> 29); 227 } else { 228 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid)); 229 rdma_ah_set_sl(ah_attr, 230 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) 231 >> 28); 232 } 233 234 rdma_ah_set_port_num(ah_attr, port_num); 235 if (ah->av.ib.stat_rate) 236 rdma_ah_set_static_rate(ah_attr, 237 ah->av.ib.stat_rate - 238 MLX4_STAT_RATE_OFFSET); 239 rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F); 240 if (mlx4_ib_ah_grh_present(ah)) { 241 u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel); 242 243 rdma_ah_set_grh(ah_attr, NULL, 244 tc_fl & 0xfffff, ah->av.ib.gid_index, 245 ah->av.ib.hop_limit, 246 tc_fl >> 20); 247 rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid); 248 } 249 250 return 0; 251 } 252 253 int mlx4_ib_destroy_ah(struct ib_ah *ah, u32 flags) 254 { 255 kfree(to_mah(ah)); 256 return 0; 257 } 258