ib_addr.h

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/*
 * 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;
};

void rdma_addr_register_client(struct rdma_addr_client *client);

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;
};

int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr);

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 */