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/*
* 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 <linux/mlx4/driver.h>
#include "mlx4_ib.h"
static struct ib_ah *create_ib_ah(struct ib_pd *pd,
struct rdma_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 |
(rdma_ah_get_port_num(ah_attr) << 24));
ah->av.ib.g_slid = rdma_ah_get_path_bits(ah_attr);
ah->av.ib.sl_tclass_flowlabel =
cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28);
if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
ah->av.ib.g_slid |= 0x80;
ah->av.ib.gid_index = grh->sgid_index;
ah->av.ib.hop_limit = grh->hop_limit;
ah->av.ib.sl_tclass_flowlabel |=
cpu_to_be32((grh->traffic_class << 20) |
grh->flow_label);
memcpy(ah->av.ib.dgid, grh->dgid.raw, 16);
}
ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
if (rdma_ah_get_static_rate(ah_attr)) {
u8 static_rate = rdma_ah_get_static_rate(ah_attr) +
MLX4_STAT_RATE_OFFSET;
while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
!(1 << static_rate & dev->caps.stat_rate_support))
--static_rate;
ah->av.ib.stat_rate = static_rate;
}
return &ah->ibah;
}
static struct ib_ah *create_iboe_ah(struct ib_pd *pd,
struct rdma_ah_attr *ah_attr,
struct mlx4_ib_ah *ah)
{
struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
const struct ib_gid_attr *gid_attr;
struct mlx4_dev *dev = ibdev->dev;
int is_mcast = 0;
struct in6_addr in6;
u16 vlan_tag = 0xffff;
const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
int ret;
memcpy(&in6, grh->dgid.raw, sizeof(in6));
if (rdma_is_multicast_addr(&in6))
is_mcast = 1;
memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN);
eth_zero_addr(ah->av.eth.s_mac);
gid_attr = ah_attr->grh.sgid_attr;
if (is_vlan_dev(gid_attr->ndev))
vlan_tag = vlan_dev_vlan_id(gid_attr->ndev);
memcpy(ah->av.eth.s_mac, gid_attr->ndev->dev_addr, ETH_ALEN);
if (vlan_tag < 0x1000)
vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn |
(rdma_ah_get_port_num(ah_attr) << 24));
ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr);
if (ret < 0)
return ERR_PTR(ret);
ah->av.eth.gid_index = ret;
ah->av.eth.vlan = cpu_to_be16(vlan_tag);
ah->av.eth.hop_limit = grh->hop_limit;
if (rdma_ah_get_static_rate(ah_attr)) {
ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) +
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;
}
ah->av.eth.sl_tclass_flowlabel |=
cpu_to_be32((grh->traffic_class << 20) |
grh->flow_label);
/*
* 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, grh->dgid.raw, 16);
ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr)
<< 29);
return &ah->ibah;
}
struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
struct ib_udata *udata)
{
struct mlx4_ib_ah *ah;
struct ib_ah *ret;
ah = kzalloc(sizeof *ah, GFP_ATOMIC);
if (!ah)
return ERR_PTR(-ENOMEM);
if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
if (!(rdma_ah_get_ah_flags(ah_attr) & 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 rdma_ah_attr *ah_attr)
{
struct mlx4_ib_ah *ah = to_mah(ibah);
int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
memset(ah_attr, 0, sizeof *ah_attr);
ah_attr->type = ibah->type;
if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
rdma_ah_set_dlid(ah_attr, 0);
rdma_ah_set_sl(ah_attr,
be32_to_cpu(ah->av.eth.sl_tclass_flowlabel)
>> 29);
} else {
rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid));
rdma_ah_set_sl(ah_attr,
be32_to_cpu(ah->av.ib.sl_tclass_flowlabel)
>> 28);
}
rdma_ah_set_port_num(ah_attr, port_num);
if (ah->av.ib.stat_rate)
rdma_ah_set_static_rate(ah_attr,
ah->av.ib.stat_rate -
MLX4_STAT_RATE_OFFSET);
rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F);
if (mlx4_ib_ah_grh_present(ah)) {
u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel);
rdma_ah_set_grh(ah_attr, NULL,
tc_fl & 0xfffff, ah->av.ib.gid_index,
ah->av.ib.hop_limit,
tc_fl >> 20);
rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid);
}
return 0;
}
int mlx4_ib_destroy_ah(struct ib_ah *ah)
{
kfree(to_mah(ah));
return 0;
}
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