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 rdma_ah_attr *ah_attr) 38 { 39 enum ib_gid_type gid_type; 40 41 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 42 const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); 43 44 memcpy(ah->av.rgid, &grh->dgid, 16); 45 ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label | 46 (1 << 30) | 47 grh->sgid_index << 20); 48 ah->av.hop_limit = grh->hop_limit; 49 ah->av.tclass = grh->traffic_class; 50 } 51 52 ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4); 53 54 if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { 55 gid_type = ah_attr->grh.sgid_attr->gid_type; 56 57 memcpy(ah->av.rmac, ah_attr->roce.dmac, 58 sizeof(ah_attr->roce.dmac)); 59 ah->av.udp_sport = 60 mlx5_get_roce_udp_sport(dev, ah_attr->grh.sgid_attr); 61 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1; 62 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) 63 #define MLX5_ECN_ENABLED BIT(1) 64 ah->av.tclass |= MLX5_ECN_ENABLED; 65 } else { 66 ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr)); 67 ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f; 68 ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf); 69 } 70 71 return &ah->ibah; 72 } 73 74 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr, 75 u32 flags, struct ib_udata *udata) 76 77 { 78 struct mlx5_ib_ah *ah; 79 struct mlx5_ib_dev *dev = to_mdev(pd->device); 80 enum rdma_ah_attr_type ah_type = ah_attr->type; 81 82 if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) && 83 !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) 84 return ERR_PTR(-EINVAL); 85 86 if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) { 87 int err; 88 struct mlx5_ib_create_ah_resp resp = {}; 89 u32 min_resp_len = offsetof(typeof(resp), dmac) + 90 sizeof(resp.dmac); 91 92 if (udata->outlen < min_resp_len) 93 return ERR_PTR(-EINVAL); 94 95 resp.response_length = min_resp_len; 96 97 memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN); 98 err = ib_copy_to_udata(udata, &resp, resp.response_length); 99 if (err) 100 return ERR_PTR(err); 101 } 102 103 ah = kzalloc(sizeof(*ah), GFP_ATOMIC); 104 if (!ah) 105 return ERR_PTR(-ENOMEM); 106 107 return create_ib_ah(dev, ah, ah_attr); /* never fails */ 108 } 109 110 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 111 { 112 struct mlx5_ib_ah *ah = to_mah(ibah); 113 u32 tmp; 114 115 memset(ah_attr, 0, sizeof(*ah_attr)); 116 ah_attr->type = ibah->type; 117 118 tmp = be32_to_cpu(ah->av.grh_gid_fl); 119 if (tmp & (1 << 30)) { 120 rdma_ah_set_grh(ah_attr, NULL, 121 tmp & 0xfffff, 122 (tmp >> 20) & 0xff, 123 ah->av.hop_limit, 124 ah->av.tclass); 125 rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid); 126 } 127 rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid)); 128 rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4); 129 rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf); 130 131 return 0; 132 } 133 134 int mlx5_ib_destroy_ah(struct ib_ah *ah, u32 flags) 135 { 136 kfree(to_mah(ah)); 137 return 0; 138 } 139