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
 35static 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	int err;
 41
 42	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 43		const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
 44
 45		memcpy(ah->av.rgid, &grh->dgid, 16);
 46		ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
 47						(1 << 30) |
 48						grh->sgid_index << 20);
 49		ah->av.hop_limit = grh->hop_limit;
 50		ah->av.tclass = grh->traffic_class;
 51	}
 52
 53	ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
 54
 55	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
 56		err = mlx5_get_roce_gid_type(dev, ah_attr->port_num,
 57					     ah_attr->grh.sgid_index,
 58					     &gid_type);
 59		if (err)
 60			return ERR_PTR(err);
 61
 62		memcpy(ah->av.rmac, ah_attr->roce.dmac,
 63		       sizeof(ah_attr->roce.dmac));
 64		ah->av.udp_sport =
 65		mlx5_get_roce_udp_sport(dev,
 66					rdma_ah_get_port_num(ah_attr),
 67					rdma_ah_read_grh(ah_attr)->sgid_index);
 68		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
 69		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
 70#define MLX5_ECN_ENABLED BIT(1)
 71			ah->av.tclass |= MLX5_ECN_ENABLED;
 72	} else {
 73		ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
 74		ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
 75		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
 76	}
 77
 78	return &ah->ibah;
 79}
 80
 81struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
 82				struct ib_udata *udata)
 83
 84{
 85	struct mlx5_ib_ah *ah;
 86	struct mlx5_ib_dev *dev = to_mdev(pd->device);
 87	enum rdma_ah_attr_type ah_type = ah_attr->type;
 88
 89	if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
 90	    !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
 91		return ERR_PTR(-EINVAL);
 92
 93	if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
 94		int err;
 95		struct mlx5_ib_create_ah_resp resp = {};
 96		u32 min_resp_len = offsetof(typeof(resp), dmac) +
 97				   sizeof(resp.dmac);
 98
 99		if (udata->outlen < min_resp_len)
100			return ERR_PTR(-EINVAL);
101
102		resp.response_length = min_resp_len;
103
104		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
105		err = ib_copy_to_udata(udata, &resp, resp.response_length);
106		if (err)
107			return ERR_PTR(err);
108	}
109
110	ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
111	if (!ah)
112		return ERR_PTR(-ENOMEM);
113
114	return create_ib_ah(dev, ah, ah_attr); /* never fails */
115}
116
117int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
118{
119	struct mlx5_ib_ah *ah = to_mah(ibah);
120	u32 tmp;
121
122	memset(ah_attr, 0, sizeof(*ah_attr));
123	ah_attr->type = ibah->type;
124
125	tmp = be32_to_cpu(ah->av.grh_gid_fl);
126	if (tmp & (1 << 30)) {
127		rdma_ah_set_grh(ah_attr, NULL,
128				tmp & 0xfffff,
129				(tmp >> 20) & 0xff,
130				ah->av.hop_limit,
131				ah->av.tclass);
132		rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
133	}
134	rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
135	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
136	rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
137
138	return 0;
139}
140
141int mlx5_ib_destroy_ah(struct ib_ah *ah)
142{
143	kfree(to_mah(ah));
144	return 0;
145}