ah.c

  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 __be16 mlx5_ah_get_udp_sport(const struct mlx5_ib_dev *dev,
 36				  const struct rdma_ah_attr *ah_attr)
 37{
 38	enum ib_gid_type gid_type = ah_attr->grh.sgid_attr->gid_type;
 39	__be16 sport;
 40
 41	if ((gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) &&
 42	    (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
 43	    (ah_attr->grh.flow_label & IB_GRH_FLOWLABEL_MASK))
 44		sport = cpu_to_be16(
 45			rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
 46	else
 47		sport = mlx5_get_roce_udp_sport_min(dev,
 48						    ah_attr->grh.sgid_attr);
 49
 50	return sport;
 51}
 52
 53static int create_ib_ah(struct mlx5_ib_dev *dev, struct mlx5_ib_ah *ah,
 54			 struct rdma_ah_init_attr *init_attr)
 55{
 56	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
 57	enum ib_gid_type gid_type;
 58	int rate_val;
 59
 60	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 61		const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
 62
 63		memcpy(ah->av.rgid, &grh->dgid, 16);
 64		ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
 65						(1 << 30) |
 66						grh->sgid_index << 20);
 67		ah->av.hop_limit = grh->hop_limit;
 68		ah->av.tclass = grh->traffic_class;
 69	}
 70
 71	rate_val = mlx5r_ib_rate(dev, rdma_ah_get_static_rate(ah_attr));
 72	if (rate_val < 0)
 73		return rate_val;
 74	ah->av.stat_rate_sl = rate_val << 4;
 75
 76	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
 77		if (init_attr->xmit_slave)
 78			ah->xmit_port =
 79				mlx5_lag_get_slave_port(dev->mdev,
 80							init_attr->xmit_slave);
 81		gid_type = ah_attr->grh.sgid_attr->gid_type;
 82
 83		memcpy(ah->av.rmac, ah_attr->roce.dmac,
 84		       sizeof(ah_attr->roce.dmac));
 85		ah->av.udp_sport = mlx5_ah_get_udp_sport(dev, ah_attr);
 86		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
 87		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
 88#define MLX5_ECN_ENABLED BIT(1)
 89			ah->av.tclass |= MLX5_ECN_ENABLED;
 90	} else {
 91		ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
 92		ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
 93		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
 94	}
 95
 96	return 0;
 97}
 98
 99int mlx5_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
100		      struct ib_udata *udata)
101
102{
103	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
104	struct mlx5_ib_ah *ah = to_mah(ibah);
105	struct mlx5_ib_dev *dev = to_mdev(ibah->device);
106	enum rdma_ah_attr_type ah_type = ah_attr->type;
107
108	if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
109	    !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
110		return -EINVAL;
111
112	if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
113		int err;
114		struct mlx5_ib_create_ah_resp resp = {};
115		u32 min_resp_len =
116			offsetofend(struct mlx5_ib_create_ah_resp, dmac);
117
118		if (udata->outlen < min_resp_len)
119			return -EINVAL;
120
121		resp.response_length = min_resp_len;
122
123		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
124		err = ib_copy_to_udata(udata, &resp, resp.response_length);
125		if (err)
126			return err;
127	}
128
129	return create_ib_ah(dev, ah, init_attr);
130}
131
132int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
133{
134	struct mlx5_ib_ah *ah = to_mah(ibah);
135	u32 tmp;
136
137	memset(ah_attr, 0, sizeof(*ah_attr));
138	ah_attr->type = ibah->type;
139
140	tmp = be32_to_cpu(ah->av.grh_gid_fl);
141	if (tmp & (1 << 30)) {
142		rdma_ah_set_grh(ah_attr, NULL,
143				tmp & 0xfffff,
144				(tmp >> 20) & 0xff,
145				ah->av.hop_limit,
146				ah->av.tclass);
147		rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
148	}
149	rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
150	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
151	rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
152
153	return 0;
154}