hw/mlx5/ah.c

0001 /*
0002  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
0003  *
0004  * This software is available to you under a choice of one of two
0005  * licenses.  You may choose to be licensed under the terms of the GNU
0006  * General Public License (GPL) Version 2, available from the file
0007  * COPYING in the main directory of this source tree, or the
0008  * OpenIB.org BSD license below:
0009  *
0010  *     Redistribution and use in source and binary forms, with or
0011  *     without modification, are permitted provided that the following
0012  *     conditions are met:
0013  *
0014  *      - Redistributions of source code must retain the above
0015  *        copyright notice, this list of conditions and the following
0016  *        disclaimer.
0017  *
0018  *      - Redistributions in binary form must reproduce the above
0019  *        copyright notice, this list of conditions and the following
0020  *        disclaimer in the documentation and/or other materials
0021  *        provided with the distribution.
0022  *
0023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0024  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0025  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0026  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0027  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0028  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0029  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0030  * SOFTWARE.
0031  */
0032
0033 #include "mlx5_ib.h"
0034
0035 static __be16 mlx5_ah_get_udp_sport(const struct mlx5_ib_dev *dev,
0036                   const struct rdma_ah_attr *ah_attr)
0037 {
0038     enum ib_gid_type gid_type = ah_attr->grh.sgid_attr->gid_type;
0039     __be16 sport;
0040
0041     if ((gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) &&
0042         (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
0043         (ah_attr->grh.flow_label & IB_GRH_FLOWLABEL_MASK))
0044         sport = cpu_to_be16(
0045             rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
0046     else
0047         sport = mlx5_get_roce_udp_sport_min(dev,
0048                             ah_attr->grh.sgid_attr);
0049
0050     return sport;
0051 }
0052
0053 static void create_ib_ah(struct mlx5_ib_dev *dev, struct mlx5_ib_ah *ah,
0054              struct rdma_ah_init_attr *init_attr)
0055 {
0056     struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
0057     enum ib_gid_type gid_type;
0058
0059     if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
0060         const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
0061
0062         memcpy(ah->av.rgid, &grh->dgid, 16);
0063         ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
0064                         (1 << 30) |
0065                         grh->sgid_index << 20);
0066         ah->av.hop_limit = grh->hop_limit;
0067         ah->av.tclass = grh->traffic_class;
0068     }
0069
0070     ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
0071
0072     if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
0073         if (init_attr->xmit_slave)
0074             ah->xmit_port =
0075                 mlx5_lag_get_slave_port(dev->mdev,
0076                             init_attr->xmit_slave);
0077         gid_type = ah_attr->grh.sgid_attr->gid_type;
0078
0079         memcpy(ah->av.rmac, ah_attr->roce.dmac,
0080                sizeof(ah_attr->roce.dmac));
0081         ah->av.udp_sport = mlx5_ah_get_udp_sport(dev, ah_attr);
0082         ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
0083         if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
0084 #define MLX5_ECN_ENABLED BIT(1)
0085             ah->av.tclass |= MLX5_ECN_ENABLED;
0086     } else {
0087         ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
0088         ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
0089         ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
0090     }
0091 }
0092
0093 int mlx5_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
0094               struct ib_udata *udata)
0095
0096 {
0097     struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
0098     struct mlx5_ib_ah *ah = to_mah(ibah);
0099     struct mlx5_ib_dev *dev = to_mdev(ibah->device);
0100     enum rdma_ah_attr_type ah_type = ah_attr->type;
0101
0102     if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
0103         !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
0104         return -EINVAL;
0105
0106     if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
0107         int err;
0108         struct mlx5_ib_create_ah_resp resp = {};
0109         u32 min_resp_len =
0110             offsetofend(struct mlx5_ib_create_ah_resp, dmac);
0111
0112         if (udata->outlen < min_resp_len)
0113             return -EINVAL;
0114
0115         resp.response_length = min_resp_len;
0116
0117         memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
0118         err = ib_copy_to_udata(udata, &resp, resp.response_length);
0119         if (err)
0120             return err;
0121     }
0122
0123     create_ib_ah(dev, ah, init_attr);
0124     return 0;
0125 }
0126
0127 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
0128 {
0129     struct mlx5_ib_ah *ah = to_mah(ibah);
0130     u32 tmp;
0131
0132     memset(ah_attr, 0, sizeof(*ah_attr));
0133     ah_attr->type = ibah->type;
0134
0135     tmp = be32_to_cpu(ah->av.grh_gid_fl);
0136     if (tmp & (1 << 30)) {
0137         rdma_ah_set_grh(ah_attr, NULL,
0138                 tmp & 0xfffff,
0139                 (tmp >> 20) & 0xff,
0140                 ah->av.hop_limit,
0141                 ah->av.tclass);
0142         rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
0143     }
0144     rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
0145     rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
0146     rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
0147
0148     return 0;
0149 }