/*
 * 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 <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>

#include <linux/slab.h>
#include <linux/string.h>
#include <linux/etherdevice.h>

#include "mlx4_ib.h"

static int create_ib_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr)
{
        struct ib_pd *pd = ib_ah->pd;
        struct mlx4_ib_ah *ah = to_mah(ib_ah);
        struct mlx4_dev *dev = to_mdev(ib_ah->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)) {
                ah->av.ib.stat_rate = rdma_ah_get_static_rate(ah_attr) +
                    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;
        }
        return 0;
}

static int create_iboe_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr)
{
        struct ib_pd *pd = ib_ah->pd;
        struct mlx4_ib_dev *ibdev = to_mdev(ib_ah->device);
        const struct ib_gid_attr *gid_attr;
        struct mlx4_ib_ah *ah = to_mah(ib_ah);
        struct mlx4_dev *dev = ibdev->dev;
        const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
        int is_mcast = 0;
        struct in6_addr in6;
        u16 vlan_tag = 0xffff;
        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;
        ret = rdma_read_gid_l2_fields(gid_attr, &vlan_tag,
                                      &ah->av.eth.s_mac[0]);
        if (ret)
                return ret;
        
        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 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;
        }

        /*
         * 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 0;
}

int mlx4_ib_create_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr,
                      u32 flags, struct ib_udata *udata)
{
        if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
                if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) {
                        return -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.
                         */
                        return create_iboe_ah(ib_ah, ah_attr);
                }
        }
        return create_ib_ah(ib_ah, ah_attr);
}

int mlx4_ib_create_ah_slave(struct ib_ah *ah, struct rdma_ah_attr *ah_attr,
                            int slave_sgid_index, u8 *s_mac, u16 vlan_tag)
{
        struct rdma_ah_attr slave_attr = *ah_attr;
        struct mlx4_ib_ah *mah = to_mah(ah);
        int ret;

        slave_attr.grh.sgid_index = slave_sgid_index;
        ret = mlx4_ib_create_ah(ah, &slave_attr, 0, NULL);
        if (ret)
                return ret;

        ah->type = ah_attr->type;

        /* get rid of force-loopback bit */
        mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF);

        if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE)
                memcpy(mah->av.eth.s_mac, s_mac, 6);

        if (vlan_tag < 0x1000)
                vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
        mah->av.eth.vlan = cpu_to_be16(vlan_tag);

        return 0;
}

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;
}

void mlx4_ib_destroy_ah(struct ib_ah *ah, u32 flags)
{
        return;
}