/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2005 Intel Corporation.  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.
 */

#if !defined(IB_ADDR_H)
#define IB_ADDR_H

#include <linux/in.h>
#include <linux/in6.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/if_vlan.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_pack.h>

struct rdma_addr_client {
        atomic_t refcount;
        struct completion comp;
};

/**
 * rdma_addr_register_client - Register an address client.
 */
void rdma_addr_register_client(struct rdma_addr_client *client);

/**
 * rdma_addr_unregister_client - Deregister an address client.
 * @client: Client object to deregister.
 */
void rdma_addr_unregister_client(struct rdma_addr_client *client);

struct rdma_dev_addr {
        unsigned char src_dev_addr[MAX_ADDR_LEN];
        unsigned char dst_dev_addr[MAX_ADDR_LEN];
        unsigned char broadcast[MAX_ADDR_LEN];
        unsigned short dev_type;
        int bound_dev_if;
        enum rdma_transport_type transport;
};

/**
 * rdma_translate_ip - Translate a local IP address to an RDMA hardware
 *   address.
 */
int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr);

/**
 * rdma_resolve_ip - Resolve source and destination IP addresses to
 *   RDMA hardware addresses.
 * @client: Address client associated with request.
 * @src_addr: An optional source address to use in the resolution.  If a
 *   source address is not provided, a usable address will be returned via
 *   the callback.
 * @dst_addr: The destination address to resolve.
 * @addr: A reference to a data location that will receive the resolved
 *   addresses.  The data location must remain valid until the callback has
 *   been invoked.
 * @timeout_ms: Amount of time to wait for the address resolution to complete.
 * @callback: Call invoked once address resolution has completed, timed out,
 *   or been canceled.  A status of 0 indicates success.
 * @context: User-specified context associated with the call.
 */
int rdma_resolve_ip(struct rdma_addr_client *client,
                    struct sockaddr *src_addr, struct sockaddr *dst_addr,
                    struct rdma_dev_addr *addr, int timeout_ms,
                    void (*callback)(int status, struct sockaddr *src_addr,
                                     struct rdma_dev_addr *addr, void *context),
                    void *context);

void rdma_addr_cancel(struct rdma_dev_addr *addr);

int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
              const unsigned char *dst_dev_addr);

static inline int ip_addr_size(struct sockaddr *addr)
{
        return addr->sa_family == AF_INET6 ?
               sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
}

static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
{
        return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
}

static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
{
        dev_addr->broadcast[8] = pkey >> 8;
        dev_addr->broadcast[9] = (unsigned char) pkey;
}

static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
                                    union ib_gid *gid)
{
        memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
}

static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
{
        return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
}

static inline void iboe_mac_vlan_to_ll(union ib_gid *gid, u8 *mac, u16 vid)
{
        memset(gid->raw, 0, 16);
        *((__be32 *) gid->raw) = cpu_to_be32(0xfe800000);
        if (vid < 0x1000) {
                gid->raw[12] = vid & 0xff;
                gid->raw[11] = vid >> 8;
        } else {
                gid->raw[12] = 0xfe;
                gid->raw[11] = 0xff;
        }
        memcpy(gid->raw + 13, mac + 3, 3);
        memcpy(gid->raw + 8, mac, 3);
        gid->raw[8] ^= 2;
}

static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
{
        return dev->priv_flags & IFF_802_1Q_VLAN ?
                vlan_dev_vlan_id(dev) : 0xffff;
}

static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
                                      union ib_gid *gid)
{
        struct net_device *dev;
        u16 vid = 0xffff;

        dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
        if (dev) {
                vid = rdma_vlan_dev_vlan_id(dev);
                dev_put(dev);
        }

        iboe_mac_vlan_to_ll(gid, dev_addr->src_dev_addr, vid);
}

static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
        if (dev_addr->transport == RDMA_TRANSPORT_IB &&
            dev_addr->dev_type != ARPHRD_INFINIBAND)
                iboe_addr_get_sgid(dev_addr, gid);
        else
                memcpy(gid, dev_addr->src_dev_addr +
                       rdma_addr_gid_offset(dev_addr), sizeof *gid);
}

static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
        memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
}

static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
        memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
}

static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
        memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
}

static inline enum ib_mtu iboe_get_mtu(int mtu)
{
        /*
         * reduce IB headers from effective IBoE MTU. 28 stands for
         * atomic header which is the biggest possible header after BTH
         */
        mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;

        if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
                return IB_MTU_4096;
        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
                return IB_MTU_2048;
        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
                return IB_MTU_1024;
        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
                return IB_MTU_512;
        else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
                return IB_MTU_256;
        else
                return 0;
}

static inline int iboe_get_rate(struct net_device *dev)
{
        struct ethtool_cmd cmd;
        u32 speed;
        int err;

        rtnl_lock();
        err = __ethtool_get_settings(dev, &cmd);
        rtnl_unlock();
        if (err)
                return IB_RATE_PORT_CURRENT;

        speed = ethtool_cmd_speed(&cmd);
        if (speed >= 40000)
                return IB_RATE_40_GBPS;
        else if (speed >= 30000)
                return IB_RATE_30_GBPS;
        else if (speed >= 20000)
                return IB_RATE_20_GBPS;
        else if (speed >= 10000)
                return IB_RATE_10_GBPS;
        else
                return IB_RATE_PORT_CURRENT;
}

static inline int rdma_link_local_addr(struct in6_addr *addr)
{
        if (addr->s6_addr32[0] == htonl(0xfe800000) &&
            addr->s6_addr32[1] == 0)
                return 1;

        return 0;
}

static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
{
        memcpy(mac, &addr->s6_addr[8], 3);
        memcpy(mac + 3, &addr->s6_addr[13], 3);
        mac[0] ^= 2;
}

static inline int rdma_is_multicast_addr(struct in6_addr *addr)
{
        return addr->s6_addr[0] == 0xff;
}

static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
{
        int i;

        mac[0] = 0x33;
        mac[1] = 0x33;
        for (i = 2; i < 6; ++i)
                mac[i] = addr->s6_addr[i + 10];
}

static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
{
        u16 vid;

        vid = dgid->raw[11] << 8 | dgid->raw[12];
        return vid < 0x1000 ? vid : 0xffff;
}

static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
{
        return dev->priv_flags & IFF_802_1Q_VLAN ?
                vlan_dev_real_dev(dev) : NULL;
}

#endif /* IB_ADDR_H */