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 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
 67struct 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
108int 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
131int mlx5_ib_destroy_ah(struct ib_ah *ah)
132{
133	kfree(to_mah(ah));
134	return 0;
135}