/*
* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "mlx5_ib.h"
static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
struct mlx5_ib_ah *ah,
struct ib_ah_attr *ah_attr,
enum rdma_link_layer ll)
{
if (ah_attr->ah_flags & IB_AH_GRH) {
memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
(1 << 30) |
ah_attr->grh.sgid_index << 20);
ah->av.hop_limit = ah_attr->grh.hop_limit;
ah->av.tclass = ah_attr->grh.traffic_class;
}
ah->av.stat_rate_sl = (ah_attr->static_rate << 4);
if (ll == IB_LINK_LAYER_ETHERNET) {
memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac));
ah->av.udp_sport =
mlx5_get_roce_udp_sport(dev,
ah_attr->port_num,
ah_attr->grh.sgid_index);
ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1;
} else {
ah->av.rlid = cpu_to_be16(ah_attr->dlid);
ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
ah->av.stat_rate_sl |= (ah_attr->sl & 0xf);
}
return &ah->ibah;
}
struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
struct ib_udata *udata)
{
struct mlx5_ib_ah *ah;
struct mlx5_ib_dev *dev = to_mdev(pd->device);
enum rdma_link_layer ll;
ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
return ERR_PTR(-EINVAL);
if (ll == IB_LINK_LAYER_ETHERNET && udata) {
int err;
struct mlx5_ib_create_ah_resp resp = {};
u32 min_resp_len = offsetof(typeof(resp), dmac) +
sizeof(resp.dmac);
if (udata->outlen < min_resp_len)
return ERR_PTR(-EINVAL);
resp.response_length = min_resp_len;
err = ib_resolve_eth_dmac(pd->device, ah_attr);
if (err)
return ERR_PTR(err);
memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN);
err = ib_copy_to_udata(udata, &resp, resp.response_length);
if (err)
return ERR_PTR(err);
}
ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
if (!ah)
return ERR_PTR(-ENOMEM);
return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
}
int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
{
struct mlx5_ib_ah *ah = to_mah(ibah);
u32 tmp;
memset(ah_attr, 0, sizeof(*ah_attr));
tmp = be32_to_cpu(ah->av.grh_gid_fl);
if (tmp & (1 << 30)) {
ah_attr->ah_flags = IB_AH_GRH;
ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
ah_attr->grh.flow_label = tmp & 0xfffff;
memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
ah_attr->grh.hop_limit = ah->av.hop_limit;
ah_attr->grh.traffic_class = ah->av.tclass;
}
ah_attr->dlid = be16_to_cpu(ah->av.rlid);
ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
ah_attr->sl = ah->av.stat_rate_sl & 0xf;
return 0;
}
int mlx5_ib_destroy_ah(struct ib_ah *ah)
{
kfree(to_mah(ah));
return 0;
}
