/*
* Copyright (c) 2007 Cisco Systems, Inc. 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 <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include <linux/slab.h>
#include <linux/inet.h>
#include <linux/string.h>
#include "mlx4_ib.h"
int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
u8 *mac, int *is_mcast, u8 port)
{
struct in6_addr in6;
*is_mcast = 0;
memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
if (rdma_link_local_addr(&in6))
rdma_get_ll_mac(&in6, mac);
else if (rdma_is_multicast_addr(&in6)) {
rdma_get_mcast_mac(&in6, mac);
*is_mcast = 1;
} else
return -EINVAL;
return 0;
}
static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
struct mlx4_ib_ah *ah)
{
struct mlx4_dev *dev = to_mdev(pd->device)->dev;
ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
ah->av.ib.g_slid = ah_attr->src_path_bits;
if (ah_attr->ah_flags & IB_AH_GRH) {
ah->av.ib.g_slid |= 0x80;
ah->av.ib.gid_index = ah_attr->grh.sgid_index;
ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
ah->av.ib.sl_tclass_flowlabel |=
cpu_to_be32((ah_attr->grh.traffic_class << 20) |
ah_attr->grh.flow_label);
memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
}
ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid);
if (ah_attr->static_rate) {
ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
!(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
--ah->av.ib.stat_rate;
}
ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
return &ah->ibah;
}
static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
struct mlx4_ib_ah *ah)
{
struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
struct mlx4_dev *dev = ibdev->dev;
union ib_gid sgid;
u8 mac[6];
int err;
int is_mcast;
u16 vlan_tag;
err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
if (err)
return ERR_PTR(err);
memcpy(ah->av.eth.mac, mac, 6);
err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
if (err)
return ERR_PTR(err);
vlan_tag = rdma_get_vlan_id(&sgid);
if (vlan_tag < 0x1000)
vlan_tag |= (ah_attr->sl & 7) << 13;
ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
ah->av.eth.gid_index = ah_attr->grh.sgid_index;
ah->av.eth.vlan = cpu_to_be16(vlan_tag);
if (ah_attr->static_rate) {
ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
!(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
--ah->av.eth.stat_rate;
}
/*
* HW requires multicast LID so we just choose one.
*/
if (is_mcast)
ah->av.ib.dlid = cpu_to_be16(0xc000);
memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);
return &ah->ibah;
}
struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
{
struct mlx4_ib_ah *ah;
struct ib_ah *ret;
ah = kzalloc(sizeof *ah, GFP_ATOMIC);
if (!ah)
return ERR_PTR(-ENOMEM);
if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
if (!(ah_attr->ah_flags & IB_AH_GRH)) {
ret = ERR_PTR(-EINVAL);
} else {
/*
* TBD: need to handle the case when we get
* called in an atomic context and there we
* might sleep. We don't expect this
* currently since we're working with link
* local addresses which we can translate
* without going to sleep.
*/
ret = create_iboe_ah(pd, ah_attr, ah);
}
if (IS_ERR(ret))
kfree(ah);
return ret;
} else
return create_ib_ah(pd, ah_attr, ah); /* never fails */
}
int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
{
struct mlx4_ib_ah *ah = to_mah(ibah);
enum rdma_link_layer ll;
memset(ah_attr, 0, sizeof *ah_attr);
ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
if (ah->av.ib.stat_rate)
ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
if (mlx4_ib_ah_grh_present(ah)) {
ah_attr->ah_flags = IB_AH_GRH;
ah_attr->grh.traffic_class =
be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
ah_attr->grh.flow_label =
be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
ah_attr->grh.hop_limit = ah->av.ib.hop_limit;
ah_attr->grh.sgid_index = ah->av.ib.gid_index;
memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
}
return 0;
}
int mlx4_ib_destroy_ah(struct ib_ah *ah)
{
kfree(to_mah(ah));
return 0;
}