1 /* 2 * Copyright (c) 2013-2015, Mellanox Technologies. 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 "mlx5_ib.h" 34 35 static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev, 36 struct mlx5_ib_ah *ah, 37 struct ib_ah_attr *ah_attr, 38 enum rdma_link_layer ll) 39 { 40 if (ah_attr->ah_flags & IB_AH_GRH) { 41 memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16); 42 ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label | 43 (1 << 30) | 44 ah_attr->grh.sgid_index << 20); 45 ah->av.hop_limit = ah_attr->grh.hop_limit; 46 ah->av.tclass = ah_attr->grh.traffic_class; 47 } 48 49 ah->av.stat_rate_sl = (ah_attr->static_rate << 4); 50 51 if (ll == IB_LINK_LAYER_ETHERNET) { 52 memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac)); 53 ah->av.udp_sport = 54 mlx5_get_roce_udp_sport(dev, 55 ah_attr->port_num, 56 ah_attr->grh.sgid_index); 57 ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1; 58 } else { 59 ah->av.rlid = cpu_to_be16(ah_attr->dlid); 60 ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f; 61 ah->av.stat_rate_sl |= (ah_attr->sl & 0xf); 62 } 63 64 return &ah->ibah; 65 } 66 67 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr, 68 struct ib_udata *udata) 69 70 { 71 struct mlx5_ib_ah *ah; 72 struct mlx5_ib_dev *dev = to_mdev(pd->device); 73 enum rdma_link_layer ll; 74 75 ll = pd->device->get_link_layer(pd->device, ah_attr->port_num); 76 77 if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH)) 78 return ERR_PTR(-EINVAL); 79 80 if (ll == IB_LINK_LAYER_ETHERNET && udata) { 81 int err; 82 struct mlx5_ib_create_ah_resp resp = {}; 83 u32 min_resp_len = offsetof(typeof(resp), dmac) + 84 sizeof(resp.dmac); 85 86 if (udata->outlen < min_resp_len) 87 return ERR_PTR(-EINVAL); 88 89 resp.response_length = min_resp_len; 90 91 err = ib_resolve_eth_dmac(pd->device, ah_attr); 92 if (err) 93 return ERR_PTR(err); 94 95 memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN); 96 err = ib_copy_to_udata(udata, &resp, resp.response_length); 97 if (err) 98 return ERR_PTR(err); 99 } 100 101 ah = kzalloc(sizeof(*ah), GFP_ATOMIC); 102 if (!ah) 103 return ERR_PTR(-ENOMEM); 104 105 return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */ 106 } 107 108 int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr) 109 { 110 struct mlx5_ib_ah *ah = to_mah(ibah); 111 u32 tmp; 112 113 memset(ah_attr, 0, sizeof(*ah_attr)); 114 115 tmp = be32_to_cpu(ah->av.grh_gid_fl); 116 if (tmp & (1 << 30)) { 117 ah_attr->ah_flags = IB_AH_GRH; 118 ah_attr->grh.sgid_index = (tmp >> 20) & 0xff; 119 ah_attr->grh.flow_label = tmp & 0xfffff; 120 memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16); 121 ah_attr->grh.hop_limit = ah->av.hop_limit; 122 ah_attr->grh.traffic_class = ah->av.tclass; 123 } 124 ah_attr->dlid = be16_to_cpu(ah->av.rlid); 125 ah_attr->static_rate = ah->av.stat_rate_sl >> 4; 126 ah_attr->sl = ah->av.stat_rate_sl & 0xf; 127 128 return 0; 129 } 130 131 int mlx5_ib_destroy_ah(struct ib_ah *ah) 132 { 133 kfree(to_mah(ah)); 134 return 0; 135 } 136