Linux 4.9.199

[linux/fpc-iii.git] / include / rdma / ib_verbs.h

/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005, 2006, 2007 Cisco Systems.  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_VERBS_H)
#define IB_VERBS_H

#include <linux/types.h>
#include <linux/device.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/rwsem.h>
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/socket.h>
#include <linux/irq_poll.h>
#include <uapi/linux/if_ether.h>
#include <net/ipv6.h>
#include <net/ip.h>
#include <linux/string.h>
#include <linux/slab.h>

#include <linux/if_link.h>
#include <linux/atomic.h>
#include <linux/mmu_notifier.h>
#include <asm/uaccess.h>

extern struct workqueue_struct *ib_wq;
extern struct workqueue_struct *ib_comp_wq;
extern struct workqueue_struct *ib_comp_unbound_wq;

union ib_gid {
        u8      raw[16];
        struct {
                __be64  subnet_prefix;
                __be64  interface_id;
        } global;
};

extern union ib_gid zgid;

enum ib_gid_type {
        /* If link layer is Ethernet, this is RoCE V1 */
        IB_GID_TYPE_IB        = 0,
        IB_GID_TYPE_ROCE      = 0,
        IB_GID_TYPE_ROCE_UDP_ENCAP = 1,
        IB_GID_TYPE_SIZE
};

#define ROCE_V2_UDP_DPORT      4791
struct ib_gid_attr {
        enum ib_gid_type        gid_type;
        struct net_device       *ndev;
};

enum rdma_node_type {
        /* IB values map to NodeInfo:NodeType. */
        RDMA_NODE_IB_CA         = 1,
        RDMA_NODE_IB_SWITCH,
        RDMA_NODE_IB_ROUTER,
        RDMA_NODE_RNIC,
        RDMA_NODE_USNIC,
        RDMA_NODE_USNIC_UDP,
};

enum {
        /* set the local administered indication */
        IB_SA_WELL_KNOWN_GUID   = BIT_ULL(57) | 2,
};

enum rdma_transport_type {
        RDMA_TRANSPORT_IB,
        RDMA_TRANSPORT_IWARP,
        RDMA_TRANSPORT_USNIC,
        RDMA_TRANSPORT_USNIC_UDP
};

enum rdma_protocol_type {
        RDMA_PROTOCOL_IB,
        RDMA_PROTOCOL_IBOE,
        RDMA_PROTOCOL_IWARP,
        RDMA_PROTOCOL_USNIC_UDP
};

__attribute_const__ enum rdma_transport_type
rdma_node_get_transport(enum rdma_node_type node_type);

enum rdma_network_type {
        RDMA_NETWORK_IB,
        RDMA_NETWORK_ROCE_V1 = RDMA_NETWORK_IB,
        RDMA_NETWORK_IPV4,
        RDMA_NETWORK_IPV6
};

static inline enum ib_gid_type ib_network_to_gid_type(enum rdma_network_type network_type)
{
        if (network_type == RDMA_NETWORK_IPV4 ||
            network_type == RDMA_NETWORK_IPV6)
                return IB_GID_TYPE_ROCE_UDP_ENCAP;

        /* IB_GID_TYPE_IB same as RDMA_NETWORK_ROCE_V1 */
        return IB_GID_TYPE_IB;
}

static inline enum rdma_network_type ib_gid_to_network_type(enum ib_gid_type gid_type,
                                                            union ib_gid *gid)
{
        if (gid_type == IB_GID_TYPE_IB)
                return RDMA_NETWORK_IB;

        if (ipv6_addr_v4mapped((struct in6_addr *)gid))
                return RDMA_NETWORK_IPV4;
        else
                return RDMA_NETWORK_IPV6;
}

enum rdma_link_layer {
        IB_LINK_LAYER_UNSPECIFIED,
        IB_LINK_LAYER_INFINIBAND,
        IB_LINK_LAYER_ETHERNET,
};

enum ib_device_cap_flags {
        IB_DEVICE_RESIZE_MAX_WR                 = (1 << 0),
        IB_DEVICE_BAD_PKEY_CNTR                 = (1 << 1),
        IB_DEVICE_BAD_QKEY_CNTR                 = (1 << 2),
        IB_DEVICE_RAW_MULTI                     = (1 << 3),
        IB_DEVICE_AUTO_PATH_MIG                 = (1 << 4),
        IB_DEVICE_CHANGE_PHY_PORT               = (1 << 5),
        IB_DEVICE_UD_AV_PORT_ENFORCE            = (1 << 6),
        IB_DEVICE_CURR_QP_STATE_MOD             = (1 << 7),
        IB_DEVICE_SHUTDOWN_PORT                 = (1 << 8),
        IB_DEVICE_INIT_TYPE                     = (1 << 9),
        IB_DEVICE_PORT_ACTIVE_EVENT             = (1 << 10),
        IB_DEVICE_SYS_IMAGE_GUID                = (1 << 11),
        IB_DEVICE_RC_RNR_NAK_GEN                = (1 << 12),
        IB_DEVICE_SRQ_RESIZE                    = (1 << 13),
        IB_DEVICE_N_NOTIFY_CQ                   = (1 << 14),

        /*
         * This device supports a per-device lkey or stag that can be
         * used without performing a memory registration for the local
         * memory.  Note that ULPs should never check this flag, but
         * instead of use the local_dma_lkey flag in the ib_pd structure,
         * which will always contain a usable lkey.
         */
        IB_DEVICE_LOCAL_DMA_LKEY                = (1 << 15),
        IB_DEVICE_RESERVED /* old SEND_W_INV */ = (1 << 16),
        IB_DEVICE_MEM_WINDOW                    = (1 << 17),
        /*
         * Devices should set IB_DEVICE_UD_IP_SUM if they support
         * insertion of UDP and TCP checksum on outgoing UD IPoIB
         * messages and can verify the validity of checksum for
         * incoming messages.  Setting this flag implies that the
         * IPoIB driver may set NETIF_F_IP_CSUM for datagram mode.
         */
        IB_DEVICE_UD_IP_CSUM                    = (1 << 18),
        IB_DEVICE_UD_TSO                        = (1 << 19),
        IB_DEVICE_XRC                           = (1 << 20),

        /*
         * This device supports the IB "base memory management extension",
         * which includes support for fast registrations (IB_WR_REG_MR,
         * IB_WR_LOCAL_INV and IB_WR_SEND_WITH_INV verbs).  This flag should
         * also be set by any iWarp device which must support FRs to comply
         * to the iWarp verbs spec.  iWarp devices also support the
         * IB_WR_RDMA_READ_WITH_INV verb for RDMA READs that invalidate the
         * stag.
         */
        IB_DEVICE_MEM_MGT_EXTENSIONS            = (1 << 21),
        IB_DEVICE_BLOCK_MULTICAST_LOOPBACK      = (1 << 22),
        IB_DEVICE_MEM_WINDOW_TYPE_2A            = (1 << 23),
        IB_DEVICE_MEM_WINDOW_TYPE_2B            = (1 << 24),
        IB_DEVICE_RC_IP_CSUM                    = (1 << 25),
        IB_DEVICE_RAW_IP_CSUM                   = (1 << 26),
        /*
         * Devices should set IB_DEVICE_CROSS_CHANNEL if they
         * support execution of WQEs that involve synchronization
         * of I/O operations with single completion queue managed
         * by hardware.
         */
        IB_DEVICE_CROSS_CHANNEL         = (1 << 27),
        IB_DEVICE_MANAGED_FLOW_STEERING         = (1 << 29),
        IB_DEVICE_SIGNATURE_HANDOVER            = (1 << 30),
        IB_DEVICE_ON_DEMAND_PAGING              = (1ULL << 31),
        IB_DEVICE_SG_GAPS_REG                   = (1ULL << 32),
        IB_DEVICE_VIRTUAL_FUNCTION              = (1ULL << 33),
        IB_DEVICE_RAW_SCATTER_FCS               = (1ULL << 34),
};

enum ib_signature_prot_cap {
        IB_PROT_T10DIF_TYPE_1 = 1,
        IB_PROT_T10DIF_TYPE_2 = 1 << 1,
        IB_PROT_T10DIF_TYPE_3 = 1 << 2,
};

enum ib_signature_guard_cap {
        IB_GUARD_T10DIF_CRC     = 1,
        IB_GUARD_T10DIF_CSUM    = 1 << 1,
};

enum ib_atomic_cap {
        IB_ATOMIC_NONE,
        IB_ATOMIC_HCA,
        IB_ATOMIC_GLOB
};

enum ib_odp_general_cap_bits {
        IB_ODP_SUPPORT = 1 << 0,
};

enum ib_odp_transport_cap_bits {
        IB_ODP_SUPPORT_SEND     = 1 << 0,
        IB_ODP_SUPPORT_RECV     = 1 << 1,
        IB_ODP_SUPPORT_WRITE    = 1 << 2,
        IB_ODP_SUPPORT_READ     = 1 << 3,
        IB_ODP_SUPPORT_ATOMIC   = 1 << 4,
};

struct ib_odp_caps {
        uint64_t general_caps;
        struct {
                uint32_t  rc_odp_caps;
                uint32_t  uc_odp_caps;
                uint32_t  ud_odp_caps;
        } per_transport_caps;
};

struct ib_rss_caps {
        /* Corresponding bit will be set if qp type from
         * 'enum ib_qp_type' is supported, e.g.
         * supported_qpts |= 1 << IB_QPT_UD
         */
        u32 supported_qpts;
        u32 max_rwq_indirection_tables;
        u32 max_rwq_indirection_table_size;
};

enum ib_cq_creation_flags {
        IB_CQ_FLAGS_TIMESTAMP_COMPLETION   = 1 << 0,
        IB_CQ_FLAGS_IGNORE_OVERRUN         = 1 << 1,
};

struct ib_cq_init_attr {
        unsigned int    cqe;
        int             comp_vector;
        u32             flags;
};

struct ib_device_attr {
        u64                     fw_ver;
        __be64                  sys_image_guid;
        u64                     max_mr_size;
        u64                     page_size_cap;
        u32                     vendor_id;
        u32                     vendor_part_id;
        u32                     hw_ver;
        int                     max_qp;
        int                     max_qp_wr;
        u64                     device_cap_flags;
        int                     max_sge;
        int                     max_sge_rd;
        int                     max_cq;
        int                     max_cqe;
        int                     max_mr;
        int                     max_pd;
        int                     max_qp_rd_atom;
        int                     max_ee_rd_atom;
        int                     max_res_rd_atom;
        int                     max_qp_init_rd_atom;
        int                     max_ee_init_rd_atom;
        enum ib_atomic_cap      atomic_cap;
        enum ib_atomic_cap      masked_atomic_cap;
        int                     max_ee;
        int                     max_rdd;
        int                     max_mw;
        int                     max_raw_ipv6_qp;
        int                     max_raw_ethy_qp;
        int                     max_mcast_grp;
        int                     max_mcast_qp_attach;
        int                     max_total_mcast_qp_attach;
        int                     max_ah;
        int                     max_fmr;
        int                     max_map_per_fmr;
        int                     max_srq;
        int                     max_srq_wr;
        int                     max_srq_sge;
        unsigned int            max_fast_reg_page_list_len;
        u16                     max_pkeys;
        u8                      local_ca_ack_delay;
        int                     sig_prot_cap;
        int                     sig_guard_cap;
        struct ib_odp_caps      odp_caps;
        uint64_t                timestamp_mask;
        uint64_t                hca_core_clock; /* in KHZ */
        struct ib_rss_caps      rss_caps;
        u32                     max_wq_type_rq;
};

enum ib_mtu {
        IB_MTU_256  = 1,
        IB_MTU_512  = 2,
        IB_MTU_1024 = 3,
        IB_MTU_2048 = 4,
        IB_MTU_4096 = 5
};

static inline int ib_mtu_enum_to_int(enum ib_mtu mtu)
{
        switch (mtu) {
        case IB_MTU_256:  return  256;
        case IB_MTU_512:  return  512;
        case IB_MTU_1024: return 1024;
        case IB_MTU_2048: return 2048;
        case IB_MTU_4096: return 4096;
        default:          return -1;
        }
}

enum ib_port_state {
        IB_PORT_NOP             = 0,
        IB_PORT_DOWN            = 1,
        IB_PORT_INIT            = 2,
        IB_PORT_ARMED           = 3,
        IB_PORT_ACTIVE          = 4,
        IB_PORT_ACTIVE_DEFER    = 5
};

enum ib_port_cap_flags {
        IB_PORT_SM                              = 1 <<  1,
        IB_PORT_NOTICE_SUP                      = 1 <<  2,
        IB_PORT_TRAP_SUP                        = 1 <<  3,
        IB_PORT_OPT_IPD_SUP                     = 1 <<  4,
        IB_PORT_AUTO_MIGR_SUP                   = 1 <<  5,
        IB_PORT_SL_MAP_SUP                      = 1 <<  6,
        IB_PORT_MKEY_NVRAM                      = 1 <<  7,
        IB_PORT_PKEY_NVRAM                      = 1 <<  8,
        IB_PORT_LED_INFO_SUP                    = 1 <<  9,
        IB_PORT_SM_DISABLED                     = 1 << 10,
        IB_PORT_SYS_IMAGE_GUID_SUP              = 1 << 11,
        IB_PORT_PKEY_SW_EXT_PORT_TRAP_SUP       = 1 << 12,
        IB_PORT_EXTENDED_SPEEDS_SUP             = 1 << 14,
        IB_PORT_CM_SUP                          = 1 << 16,
        IB_PORT_SNMP_TUNNEL_SUP                 = 1 << 17,
        IB_PORT_REINIT_SUP                      = 1 << 18,
        IB_PORT_DEVICE_MGMT_SUP                 = 1 << 19,
        IB_PORT_VENDOR_CLASS_SUP                = 1 << 20,
        IB_PORT_DR_NOTICE_SUP                   = 1 << 21,
        IB_PORT_CAP_MASK_NOTICE_SUP             = 1 << 22,
        IB_PORT_BOOT_MGMT_SUP                   = 1 << 23,
        IB_PORT_LINK_LATENCY_SUP                = 1 << 24,
        IB_PORT_CLIENT_REG_SUP                  = 1 << 25,
        IB_PORT_IP_BASED_GIDS                   = 1 << 26,
};

enum ib_port_width {
        IB_WIDTH_1X     = 1,
        IB_WIDTH_4X     = 2,
        IB_WIDTH_8X     = 4,
        IB_WIDTH_12X    = 8
};

static inline int ib_width_enum_to_int(enum ib_port_width width)
{
        switch (width) {
        case IB_WIDTH_1X:  return  1;
        case IB_WIDTH_4X:  return  4;
        case IB_WIDTH_8X:  return  8;
        case IB_WIDTH_12X: return 12;
        default:          return -1;
        }
}

enum ib_port_speed {
        IB_SPEED_SDR    = 1,
        IB_SPEED_DDR    = 2,
        IB_SPEED_QDR    = 4,
        IB_SPEED_FDR10  = 8,
        IB_SPEED_FDR    = 16,
        IB_SPEED_EDR    = 32
};

/**
 * struct rdma_hw_stats
 * @timestamp - Used by the core code to track when the last update was
 * @lifespan - Used by the core code to determine how old the counters
 *   should be before being updated again.  Stored in jiffies, defaults
 *   to 10 milliseconds, drivers can override the default be specifying
 *   their own value during their allocation routine.
 * @name - Array of pointers to static names used for the counters in
 *   directory.
 * @num_counters - How many hardware counters there are.  If name is
 *   shorter than this number, a kernel oops will result.  Driver authors
 *   are encouraged to leave BUILD_BUG_ON(ARRAY_SIZE(@name) < num_counters)
 *   in their code to prevent this.
 * @value - Array of u64 counters that are accessed by the sysfs code and
 *   filled in by the drivers get_stats routine
 */
struct rdma_hw_stats {
        unsigned long   timestamp;
        unsigned long   lifespan;
        const char * const *names;
        int             num_counters;
        u64             value[];
};

#define RDMA_HW_STATS_DEFAULT_LIFESPAN 10
/**
 * rdma_alloc_hw_stats_struct - Helper function to allocate dynamic struct
 *   for drivers.
 * @names - Array of static const char *
 * @num_counters - How many elements in array
 * @lifespan - How many milliseconds between updates
 */
static inline struct rdma_hw_stats *rdma_alloc_hw_stats_struct(
                const char * const *names, int num_counters,
                unsigned long lifespan)
{
        struct rdma_hw_stats *stats;

        stats = kzalloc(sizeof(*stats) + num_counters * sizeof(u64),
                        GFP_KERNEL);
        if (!stats)
                return NULL;
        stats->names = names;
        stats->num_counters = num_counters;
        stats->lifespan = msecs_to_jiffies(lifespan);

        return stats;
}


/* Define bits for the various functionality this port needs to be supported by
 * the core.
 */
/* Management                           0x00000FFF */
#define RDMA_CORE_CAP_IB_MAD            0x00000001
#define RDMA_CORE_CAP_IB_SMI            0x00000002
#define RDMA_CORE_CAP_IB_CM             0x00000004
#define RDMA_CORE_CAP_IW_CM             0x00000008
#define RDMA_CORE_CAP_IB_SA             0x00000010
#define RDMA_CORE_CAP_OPA_MAD           0x00000020

/* Address format                       0x000FF000 */
#define RDMA_CORE_CAP_AF_IB             0x00001000
#define RDMA_CORE_CAP_ETH_AH            0x00002000

/* Protocol                             0xFFF00000 */
#define RDMA_CORE_CAP_PROT_IB           0x00100000
#define RDMA_CORE_CAP_PROT_ROCE         0x00200000
#define RDMA_CORE_CAP_PROT_IWARP        0x00400000
#define RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP 0x00800000

#define RDMA_CORE_PORT_IBA_IB          (RDMA_CORE_CAP_PROT_IB  \
                                        | RDMA_CORE_CAP_IB_MAD \
                                        | RDMA_CORE_CAP_IB_SMI \
                                        | RDMA_CORE_CAP_IB_CM  \
                                        | RDMA_CORE_CAP_IB_SA  \
                                        | RDMA_CORE_CAP_AF_IB)
#define RDMA_CORE_PORT_IBA_ROCE        (RDMA_CORE_CAP_PROT_ROCE \
                                        | RDMA_CORE_CAP_IB_MAD  \
                                        | RDMA_CORE_CAP_IB_CM   \
                                        | RDMA_CORE_CAP_AF_IB   \
                                        | RDMA_CORE_CAP_ETH_AH)
#define RDMA_CORE_PORT_IBA_ROCE_UDP_ENCAP                       \
                                        (RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP \
                                        | RDMA_CORE_CAP_IB_MAD  \
                                        | RDMA_CORE_CAP_IB_CM   \
                                        | RDMA_CORE_CAP_AF_IB   \
                                        | RDMA_CORE_CAP_ETH_AH)
#define RDMA_CORE_PORT_IWARP           (RDMA_CORE_CAP_PROT_IWARP \
                                        | RDMA_CORE_CAP_IW_CM)
#define RDMA_CORE_PORT_INTEL_OPA       (RDMA_CORE_PORT_IBA_IB  \
                                        | RDMA_CORE_CAP_OPA_MAD)

struct ib_port_attr {
        u64                     subnet_prefix;
        enum ib_port_state      state;
        enum ib_mtu             max_mtu;
        enum ib_mtu             active_mtu;
        int                     gid_tbl_len;
        u32                     port_cap_flags;
        u32                     max_msg_sz;
        u32                     bad_pkey_cntr;
        u32                     qkey_viol_cntr;
        u16                     pkey_tbl_len;
        u16                     lid;
        u16                     sm_lid;
        u8                      lmc;
        u8                      max_vl_num;
        u8                      sm_sl;
        u8                      subnet_timeout;
        u8                      init_type_reply;
        u8                      active_width;
        u8                      active_speed;
        u8                      phys_state;
        bool                    grh_required;
};

enum ib_device_modify_flags {
        IB_DEVICE_MODIFY_SYS_IMAGE_GUID = 1 << 0,
        IB_DEVICE_MODIFY_NODE_DESC      = 1 << 1
};

#define IB_DEVICE_NODE_DESC_MAX 64

struct ib_device_modify {
        u64     sys_image_guid;
        char    node_desc[IB_DEVICE_NODE_DESC_MAX];
};

enum ib_port_modify_flags {
        IB_PORT_SHUTDOWN                = 1,
        IB_PORT_INIT_TYPE               = (1<<2),
        IB_PORT_RESET_QKEY_CNTR         = (1<<3)
};

struct ib_port_modify {
        u32     set_port_cap_mask;
        u32     clr_port_cap_mask;
        u8      init_type;
};

enum ib_event_type {
        IB_EVENT_CQ_ERR,
        IB_EVENT_QP_FATAL,
        IB_EVENT_QP_REQ_ERR,
        IB_EVENT_QP_ACCESS_ERR,
        IB_EVENT_COMM_EST,
        IB_EVENT_SQ_DRAINED,
        IB_EVENT_PATH_MIG,
        IB_EVENT_PATH_MIG_ERR,
        IB_EVENT_DEVICE_FATAL,
        IB_EVENT_PORT_ACTIVE,
        IB_EVENT_PORT_ERR,
        IB_EVENT_LID_CHANGE,
        IB_EVENT_PKEY_CHANGE,
        IB_EVENT_SM_CHANGE,
        IB_EVENT_SRQ_ERR,
        IB_EVENT_SRQ_LIMIT_REACHED,
        IB_EVENT_QP_LAST_WQE_REACHED,
        IB_EVENT_CLIENT_REREGISTER,
        IB_EVENT_GID_CHANGE,
        IB_EVENT_WQ_FATAL,
};

const char *__attribute_const__ ib_event_msg(enum ib_event_type event);

struct ib_event {
        struct ib_device        *device;
        union {
                struct ib_cq    *cq;
                struct ib_qp    *qp;
                struct ib_srq   *srq;
                struct ib_wq    *wq;
                u8              port_num;
        } element;
        enum ib_event_type      event;
};

struct ib_event_handler {
        struct ib_device *device;
        void            (*handler)(struct ib_event_handler *, struct ib_event *);
        struct list_head  list;
};

#define INIT_IB_EVENT_HANDLER(_ptr, _device, _handler)          \
        do {                                                    \
                (_ptr)->device  = _device;                      \
                (_ptr)->handler = _handler;                     \
                INIT_LIST_HEAD(&(_ptr)->list);                  \
        } while (0)

struct ib_global_route {
        union ib_gid    dgid;
        u32             flow_label;
        u8              sgid_index;
        u8              hop_limit;
        u8              traffic_class;
};

struct ib_grh {
        __be32          version_tclass_flow;
        __be16          paylen;
        u8              next_hdr;
        u8              hop_limit;
        union ib_gid    sgid;
        union ib_gid    dgid;
};

union rdma_network_hdr {
        struct ib_grh ibgrh;
        struct {
                /* The IB spec states that if it's IPv4, the header
                 * is located in the last 20 bytes of the header.
                 */
                u8              reserved[20];
                struct iphdr    roce4grh;
        };
};

enum {
        IB_MULTICAST_QPN = 0xffffff
};

#define IB_LID_PERMISSIVE       cpu_to_be16(0xFFFF)
#define IB_MULTICAST_LID_BASE   cpu_to_be16(0xC000)

enum ib_ah_flags {
        IB_AH_GRH       = 1
};

enum ib_rate {
        IB_RATE_PORT_CURRENT = 0,
        IB_RATE_2_5_GBPS = 2,
        IB_RATE_5_GBPS   = 5,
        IB_RATE_10_GBPS  = 3,
        IB_RATE_20_GBPS  = 6,
        IB_RATE_30_GBPS  = 4,
        IB_RATE_40_GBPS  = 7,
        IB_RATE_60_GBPS  = 8,
        IB_RATE_80_GBPS  = 9,
        IB_RATE_120_GBPS = 10,
        IB_RATE_14_GBPS  = 11,
        IB_RATE_56_GBPS  = 12,
        IB_RATE_112_GBPS = 13,
        IB_RATE_168_GBPS = 14,
        IB_RATE_25_GBPS  = 15,
        IB_RATE_100_GBPS = 16,
        IB_RATE_200_GBPS = 17,
        IB_RATE_300_GBPS = 18
};

/**
 * ib_rate_to_mult - Convert the IB rate enum to a multiple of the
 * base rate of 2.5 Gbit/sec.  For example, IB_RATE_5_GBPS will be
 * converted to 2, since 5 Gbit/sec is 2 * 2.5 Gbit/sec.
 * @rate: rate to convert.
 */
__attribute_const__ int ib_rate_to_mult(enum ib_rate rate);

/**
 * ib_rate_to_mbps - Convert the IB rate enum to Mbps.
 * For example, IB_RATE_2_5_GBPS will be converted to 2500.
 * @rate: rate to convert.
 */
__attribute_const__ int ib_rate_to_mbps(enum ib_rate rate);


/**
 * enum ib_mr_type - memory region type
 * @IB_MR_TYPE_MEM_REG:       memory region that is used for
 *                            normal registration
 * @IB_MR_TYPE_SIGNATURE:     memory region that is used for
 *                            signature operations (data-integrity
 *                            capable regions)
 * @IB_MR_TYPE_SG_GAPS:       memory region that is capable to
 *                            register any arbitrary sg lists (without
 *                            the normal mr constraints - see
 *                            ib_map_mr_sg)
 */
enum ib_mr_type {
        IB_MR_TYPE_MEM_REG,
        IB_MR_TYPE_SIGNATURE,
        IB_MR_TYPE_SG_GAPS,
};

/**
 * Signature types
 * IB_SIG_TYPE_NONE: Unprotected.
 * IB_SIG_TYPE_T10_DIF: Type T10-DIF
 */
enum ib_signature_type {
        IB_SIG_TYPE_NONE,
        IB_SIG_TYPE_T10_DIF,
};

/**
 * Signature T10-DIF block-guard types
 * IB_T10DIF_CRC: Corresponds to T10-PI mandated CRC checksum rules.
 * IB_T10DIF_CSUM: Corresponds to IP checksum rules.
 */
enum ib_t10_dif_bg_type {
        IB_T10DIF_CRC,
        IB_T10DIF_CSUM
};

/**
 * struct ib_t10_dif_domain - Parameters specific for T10-DIF
 *     domain.
 * @bg_type: T10-DIF block guard type (CRC|CSUM)
 * @pi_interval: protection information interval.
 * @bg: seed of guard computation.
 * @app_tag: application tag of guard block
 * @ref_tag: initial guard block reference tag.
 * @ref_remap: Indicate wethear the reftag increments each block
 * @app_escape: Indicate to skip block check if apptag=0xffff
 * @ref_escape: Indicate to skip block check if reftag=0xffffffff
 * @apptag_check_mask: check bitmask of application tag.
 */
struct ib_t10_dif_domain {
        enum ib_t10_dif_bg_type bg_type;
        u16                     pi_interval;
        u16                     bg;
        u16                     app_tag;
        u32                     ref_tag;
        bool                    ref_remap;
        bool                    app_escape;
        bool                    ref_escape;
        u16                     apptag_check_mask;
};

/**
 * struct ib_sig_domain - Parameters for signature domain
 * @sig_type: specific signauture type
 * @sig: union of all signature domain attributes that may
 *     be used to set domain layout.
 */
struct ib_sig_domain {
        enum ib_signature_type sig_type;
        union {
                struct ib_t10_dif_domain dif;
        } sig;
};

/**
 * struct ib_sig_attrs - Parameters for signature handover operation
 * @check_mask: bitmask for signature byte check (8 bytes)
 * @mem: memory domain layout desciptor.
 * @wire: wire domain layout desciptor.
 */
struct ib_sig_attrs {
        u8                      check_mask;
        struct ib_sig_domain    mem;
        struct ib_sig_domain    wire;
};

enum ib_sig_err_type {
        IB_SIG_BAD_GUARD,
        IB_SIG_BAD_REFTAG,
        IB_SIG_BAD_APPTAG,
};

/**
 * struct ib_sig_err - signature error descriptor
 */
struct ib_sig_err {
        enum ib_sig_err_type    err_type;
        u32                     expected;
        u32                     actual;
        u64                     sig_err_offset;
        u32                     key;
};

enum ib_mr_status_check {
        IB_MR_CHECK_SIG_STATUS = 1,
};

/**
 * struct ib_mr_status - Memory region status container
 *
 * @fail_status: Bitmask of MR checks status. For each
 *     failed check a corresponding status bit is set.
 * @sig_err: Additional info for IB_MR_CEHCK_SIG_STATUS
 *     failure.
 */
struct ib_mr_status {
        u32                 fail_status;
        struct ib_sig_err   sig_err;
};

/**
 * mult_to_ib_rate - Convert a multiple of 2.5 Gbit/sec to an IB rate
 * enum.
 * @mult: multiple to convert.
 */
__attribute_const__ enum ib_rate mult_to_ib_rate(int mult);

struct ib_ah_attr {
        struct ib_global_route  grh;
        u16                     dlid;
        u8                      sl;
        u8                      src_path_bits;
        u8                      static_rate;
        u8                      ah_flags;
        u8                      port_num;
        u8                      dmac[ETH_ALEN];
};

enum ib_wc_status {
        IB_WC_SUCCESS,
        IB_WC_LOC_LEN_ERR,
        IB_WC_LOC_QP_OP_ERR,
        IB_WC_LOC_EEC_OP_ERR,
        IB_WC_LOC_PROT_ERR,
        IB_WC_WR_FLUSH_ERR,
        IB_WC_MW_BIND_ERR,
        IB_WC_BAD_RESP_ERR,
        IB_WC_LOC_ACCESS_ERR,
        IB_WC_REM_INV_REQ_ERR,
        IB_WC_REM_ACCESS_ERR,
        IB_WC_REM_OP_ERR,
        IB_WC_RETRY_EXC_ERR,
        IB_WC_RNR_RETRY_EXC_ERR,
        IB_WC_LOC_RDD_VIOL_ERR,
        IB_WC_REM_INV_RD_REQ_ERR,
        IB_WC_REM_ABORT_ERR,
        IB_WC_INV_EECN_ERR,
        IB_WC_INV_EEC_STATE_ERR,
        IB_WC_FATAL_ERR,
        IB_WC_RESP_TIMEOUT_ERR,
        IB_WC_GENERAL_ERR
};

const char *__attribute_const__ ib_wc_status_msg(enum ib_wc_status status);

enum ib_wc_opcode {
        IB_WC_SEND,
        IB_WC_RDMA_WRITE,
        IB_WC_RDMA_READ,
        IB_WC_COMP_SWAP,
        IB_WC_FETCH_ADD,
        IB_WC_LSO,
        IB_WC_LOCAL_INV,
        IB_WC_REG_MR,
        IB_WC_MASKED_COMP_SWAP,
        IB_WC_MASKED_FETCH_ADD,
/*
 * Set value of IB_WC_RECV so consumers can test if a completion is a
 * receive by testing (opcode & IB_WC_RECV).
 */
        IB_WC_RECV                      = 1 << 7,
        IB_WC_RECV_RDMA_WITH_IMM
};

enum ib_wc_flags {
        IB_WC_GRH               = 1,
        IB_WC_WITH_IMM          = (1<<1),
        IB_WC_WITH_INVALIDATE   = (1<<2),
        IB_WC_IP_CSUM_OK        = (1<<3),
        IB_WC_WITH_SMAC         = (1<<4),
        IB_WC_WITH_VLAN         = (1<<5),
        IB_WC_WITH_NETWORK_HDR_TYPE     = (1<<6),
};

struct ib_wc {
        union {
                u64             wr_id;
                struct ib_cqe   *wr_cqe;
        };
        enum ib_wc_status       status;
        enum ib_wc_opcode       opcode;
        u32                     vendor_err;
        u32                     byte_len;
        struct ib_qp           *qp;
        union {
                __be32          imm_data;
                u32             invalidate_rkey;
        } ex;
        u32                     src_qp;
        int                     wc_flags;
        u16                     pkey_index;
        u16                     slid;
        u8                      sl;
        u8                      dlid_path_bits;
        u8                      port_num;       /* valid only for DR SMPs on switches */
        u8                      smac[ETH_ALEN];
        u16                     vlan_id;
        u8                      network_hdr_type;
};

enum ib_cq_notify_flags {
        IB_CQ_SOLICITED                 = 1 << 0,
        IB_CQ_NEXT_COMP                 = 1 << 1,
        IB_CQ_SOLICITED_MASK            = IB_CQ_SOLICITED | IB_CQ_NEXT_COMP,
        IB_CQ_REPORT_MISSED_EVENTS      = 1 << 2,
};

enum ib_srq_type {
        IB_SRQT_BASIC,
        IB_SRQT_XRC
};

enum ib_srq_attr_mask {
        IB_SRQ_MAX_WR   = 1 << 0,
        IB_SRQ_LIMIT    = 1 << 1,
};

struct ib_srq_attr {
        u32     max_wr;
        u32     max_sge;
        u32     srq_limit;
};

struct ib_srq_init_attr {
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *srq_context;
        struct ib_srq_attr      attr;
        enum ib_srq_type        srq_type;

        union {
                struct {
                        struct ib_xrcd *xrcd;
                        struct ib_cq   *cq;
                } xrc;
        } ext;
};

struct ib_qp_cap {
        u32     max_send_wr;
        u32     max_recv_wr;
        u32     max_send_sge;
        u32     max_recv_sge;
        u32     max_inline_data;

        /*
         * Maximum number of rdma_rw_ctx structures in flight at a time.
         * ib_create_qp() will calculate the right amount of neededed WRs
         * and MRs based on this.
         */
        u32     max_rdma_ctxs;
};

enum ib_sig_type {
        IB_SIGNAL_ALL_WR,
        IB_SIGNAL_REQ_WR
};

enum ib_qp_type {
        /*
         * IB_QPT_SMI and IB_QPT_GSI have to be the first two entries
         * here (and in that order) since the MAD layer uses them as
         * indices into a 2-entry table.
         */
        IB_QPT_SMI,
        IB_QPT_GSI,

        IB_QPT_RC,
        IB_QPT_UC,
        IB_QPT_UD,
        IB_QPT_RAW_IPV6,
        IB_QPT_RAW_ETHERTYPE,
        IB_QPT_RAW_PACKET = 8,
        IB_QPT_XRC_INI = 9,
        IB_QPT_XRC_TGT,
        IB_QPT_MAX,
        /* Reserve a range for qp types internal to the low level driver.
         * These qp types will not be visible at the IB core layer, so the
         * IB_QPT_MAX usages should not be affected in the core layer
         */
        IB_QPT_RESERVED1 = 0x1000,
        IB_QPT_RESERVED2,
        IB_QPT_RESERVED3,
        IB_QPT_RESERVED4,
        IB_QPT_RESERVED5,
        IB_QPT_RESERVED6,
        IB_QPT_RESERVED7,
        IB_QPT_RESERVED8,
        IB_QPT_RESERVED9,
        IB_QPT_RESERVED10,
};

enum ib_qp_create_flags {
        IB_QP_CREATE_IPOIB_UD_LSO               = 1 << 0,
        IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK   = 1 << 1,
        IB_QP_CREATE_CROSS_CHANNEL              = 1 << 2,
        IB_QP_CREATE_MANAGED_SEND               = 1 << 3,
        IB_QP_CREATE_MANAGED_RECV               = 1 << 4,
        IB_QP_CREATE_NETIF_QP                   = 1 << 5,
        IB_QP_CREATE_SIGNATURE_EN               = 1 << 6,
        IB_QP_CREATE_USE_GFP_NOIO               = 1 << 7,
        IB_QP_CREATE_SCATTER_FCS                = 1 << 8,
        /* reserve bits 26-31 for low level drivers' internal use */
        IB_QP_CREATE_RESERVED_START             = 1 << 26,
        IB_QP_CREATE_RESERVED_END               = 1 << 31,
};

/*
 * Note: users may not call ib_close_qp or ib_destroy_qp from the event_handler
 * callback to destroy the passed in QP.
 */

struct ib_qp_init_attr {
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *qp_context;
        struct ib_cq           *send_cq;
        struct ib_cq           *recv_cq;
        struct ib_srq          *srq;
        struct ib_xrcd         *xrcd;     /* XRC TGT QPs only */
        struct ib_qp_cap        cap;
        enum ib_sig_type        sq_sig_type;
        enum ib_qp_type         qp_type;
        enum ib_qp_create_flags create_flags;

        /*
         * Only needed for special QP types, or when using the RW API.
         */
        u8                      port_num;
        struct ib_rwq_ind_table *rwq_ind_tbl;
};

struct ib_qp_open_attr {
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *qp_context;
        u32                     qp_num;
        enum ib_qp_type         qp_type;
};

enum ib_rnr_timeout {
        IB_RNR_TIMER_655_36 =  0,
        IB_RNR_TIMER_000_01 =  1,
        IB_RNR_TIMER_000_02 =  2,
        IB_RNR_TIMER_000_03 =  3,
        IB_RNR_TIMER_000_04 =  4,
        IB_RNR_TIMER_000_06 =  5,
        IB_RNR_TIMER_000_08 =  6,
        IB_RNR_TIMER_000_12 =  7,
        IB_RNR_TIMER_000_16 =  8,
        IB_RNR_TIMER_000_24 =  9,
        IB_RNR_TIMER_000_32 = 10,
        IB_RNR_TIMER_000_48 = 11,
        IB_RNR_TIMER_000_64 = 12,
        IB_RNR_TIMER_000_96 = 13,
        IB_RNR_TIMER_001_28 = 14,
        IB_RNR_TIMER_001_92 = 15,
        IB_RNR_TIMER_002_56 = 16,
        IB_RNR_TIMER_003_84 = 17,
        IB_RNR_TIMER_005_12 = 18,
        IB_RNR_TIMER_007_68 = 19,
        IB_RNR_TIMER_010_24 = 20,
        IB_RNR_TIMER_015_36 = 21,
        IB_RNR_TIMER_020_48 = 22,
        IB_RNR_TIMER_030_72 = 23,
        IB_RNR_TIMER_040_96 = 24,
        IB_RNR_TIMER_061_44 = 25,
        IB_RNR_TIMER_081_92 = 26,
        IB_RNR_TIMER_122_88 = 27,
        IB_RNR_TIMER_163_84 = 28,
        IB_RNR_TIMER_245_76 = 29,
        IB_RNR_TIMER_327_68 = 30,
        IB_RNR_TIMER_491_52 = 31
};

enum ib_qp_attr_mask {
        IB_QP_STATE                     = 1,
        IB_QP_CUR_STATE                 = (1<<1),
        IB_QP_EN_SQD_ASYNC_NOTIFY       = (1<<2),
        IB_QP_ACCESS_FLAGS              = (1<<3),
        IB_QP_PKEY_INDEX                = (1<<4),
        IB_QP_PORT                      = (1<<5),
        IB_QP_QKEY                      = (1<<6),
        IB_QP_AV                        = (1<<7),
        IB_QP_PATH_MTU                  = (1<<8),
        IB_QP_TIMEOUT                   = (1<<9),
        IB_QP_RETRY_CNT                 = (1<<10),
        IB_QP_RNR_RETRY                 = (1<<11),
        IB_QP_RQ_PSN                    = (1<<12),
        IB_QP_MAX_QP_RD_ATOMIC          = (1<<13),
        IB_QP_ALT_PATH                  = (1<<14),
        IB_QP_MIN_RNR_TIMER             = (1<<15),
        IB_QP_SQ_PSN                    = (1<<16),
        IB_QP_MAX_DEST_RD_ATOMIC        = (1<<17),
        IB_QP_PATH_MIG_STATE            = (1<<18),
        IB_QP_CAP                       = (1<<19),
        IB_QP_DEST_QPN                  = (1<<20),
        IB_QP_RESERVED1                 = (1<<21),
        IB_QP_RESERVED2                 = (1<<22),
        IB_QP_RESERVED3                 = (1<<23),
        IB_QP_RESERVED4                 = (1<<24),
};

enum ib_qp_state {
        IB_QPS_RESET,
        IB_QPS_INIT,
        IB_QPS_RTR,
        IB_QPS_RTS,
        IB_QPS_SQD,
        IB_QPS_SQE,
        IB_QPS_ERR
};

enum ib_mig_state {
        IB_MIG_MIGRATED,
        IB_MIG_REARM,
        IB_MIG_ARMED
};

enum ib_mw_type {
        IB_MW_TYPE_1 = 1,
        IB_MW_TYPE_2 = 2
};

struct ib_qp_attr {
        enum ib_qp_state        qp_state;
        enum ib_qp_state        cur_qp_state;
        enum ib_mtu             path_mtu;
        enum ib_mig_state       path_mig_state;
        u32                     qkey;
        u32                     rq_psn;
        u32                     sq_psn;
        u32                     dest_qp_num;
        int                     qp_access_flags;
        struct ib_qp_cap        cap;
        struct ib_ah_attr       ah_attr;
        struct ib_ah_attr       alt_ah_attr;
        u16                     pkey_index;
        u16                     alt_pkey_index;
        u8                      en_sqd_async_notify;
        u8                      sq_draining;
        u8                      max_rd_atomic;
        u8                      max_dest_rd_atomic;
        u8                      min_rnr_timer;
        u8                      port_num;
        u8                      timeout;
        u8                      retry_cnt;
        u8                      rnr_retry;
        u8                      alt_port_num;
        u8                      alt_timeout;
};

enum ib_wr_opcode {
        IB_WR_RDMA_WRITE,
        IB_WR_RDMA_WRITE_WITH_IMM,
        IB_WR_SEND,
        IB_WR_SEND_WITH_IMM,
        IB_WR_RDMA_READ,
        IB_WR_ATOMIC_CMP_AND_SWP,
        IB_WR_ATOMIC_FETCH_AND_ADD,
        IB_WR_LSO,
        IB_WR_SEND_WITH_INV,
        IB_WR_RDMA_READ_WITH_INV,
        IB_WR_LOCAL_INV,
        IB_WR_REG_MR,
        IB_WR_MASKED_ATOMIC_CMP_AND_SWP,
        IB_WR_MASKED_ATOMIC_FETCH_AND_ADD,
        IB_WR_REG_SIG_MR,
        /* reserve values for low level drivers' internal use.
         * These values will not be used at all in the ib core layer.
         */
        IB_WR_RESERVED1 = 0xf0,
        IB_WR_RESERVED2,
        IB_WR_RESERVED3,
        IB_WR_RESERVED4,
        IB_WR_RESERVED5,
        IB_WR_RESERVED6,
        IB_WR_RESERVED7,
        IB_WR_RESERVED8,
        IB_WR_RESERVED9,
        IB_WR_RESERVED10,
};

enum ib_send_flags {
        IB_SEND_FENCE           = 1,
        IB_SEND_SIGNALED        = (1<<1),
        IB_SEND_SOLICITED       = (1<<2),
        IB_SEND_INLINE          = (1<<3),
        IB_SEND_IP_CSUM         = (1<<4),

        /* reserve bits 26-31 for low level drivers' internal use */
        IB_SEND_RESERVED_START  = (1 << 26),
        IB_SEND_RESERVED_END    = (1 << 31),
};

struct ib_sge {
        u64     addr;
        u32     length;
        u32     lkey;
};

struct ib_cqe {
        void (*done)(struct ib_cq *cq, struct ib_wc *wc);
};

struct ib_send_wr {
        struct ib_send_wr      *next;
        union {
                u64             wr_id;
                struct ib_cqe   *wr_cqe;
        };
        struct ib_sge          *sg_list;
        int                     num_sge;
        enum ib_wr_opcode       opcode;
        int                     send_flags;
        union {
                __be32          imm_data;
                u32             invalidate_rkey;
        } ex;
};

struct ib_rdma_wr {
        struct ib_send_wr       wr;
        u64                     remote_addr;
        u32                     rkey;
};

static inline struct ib_rdma_wr *rdma_wr(struct ib_send_wr *wr)
{
        return container_of(wr, struct ib_rdma_wr, wr);
}

struct ib_atomic_wr {
        struct ib_send_wr       wr;
        u64                     remote_addr;
        u64                     compare_add;
        u64                     swap;
        u64                     compare_add_mask;
        u64                     swap_mask;
        u32                     rkey;
};

static inline struct ib_atomic_wr *atomic_wr(struct ib_send_wr *wr)
{
        return container_of(wr, struct ib_atomic_wr, wr);
}

struct ib_ud_wr {
        struct ib_send_wr       wr;
        struct ib_ah            *ah;
        void                    *header;
        int                     hlen;
        int                     mss;
        u32                     remote_qpn;
        u32                     remote_qkey;
        u16                     pkey_index; /* valid for GSI only */
        u8                      port_num;   /* valid for DR SMPs on switch only */
};

static inline struct ib_ud_wr *ud_wr(struct ib_send_wr *wr)
{
        return container_of(wr, struct ib_ud_wr, wr);
}

struct ib_reg_wr {
        struct ib_send_wr       wr;
        struct ib_mr            *mr;
        u32                     key;
        int                     access;
};

static inline struct ib_reg_wr *reg_wr(struct ib_send_wr *wr)
{
        return container_of(wr, struct ib_reg_wr, wr);
}

struct ib_sig_handover_wr {
        struct ib_send_wr       wr;
        struct ib_sig_attrs    *sig_attrs;
        struct ib_mr           *sig_mr;
        int                     access_flags;
        struct ib_sge          *prot;
};

static inline struct ib_sig_handover_wr *sig_handover_wr(struct ib_send_wr *wr)
{
        return container_of(wr, struct ib_sig_handover_wr, wr);
}

struct ib_recv_wr {
        struct ib_recv_wr      *next;
        union {
                u64             wr_id;
                struct ib_cqe   *wr_cqe;
        };
        struct ib_sge          *sg_list;
        int                     num_sge;
};

enum ib_access_flags {
        IB_ACCESS_LOCAL_WRITE   = 1,
        IB_ACCESS_REMOTE_WRITE  = (1<<1),
        IB_ACCESS_REMOTE_READ   = (1<<2),
        IB_ACCESS_REMOTE_ATOMIC = (1<<3),
        IB_ACCESS_MW_BIND       = (1<<4),
        IB_ZERO_BASED           = (1<<5),
        IB_ACCESS_ON_DEMAND     = (1<<6),
};

/*
 * XXX: these are apparently used for ->rereg_user_mr, no idea why they
 * are hidden here instead of a uapi header!
 */
enum ib_mr_rereg_flags {
        IB_MR_REREG_TRANS       = 1,
        IB_MR_REREG_PD          = (1<<1),
        IB_MR_REREG_ACCESS      = (1<<2),
        IB_MR_REREG_SUPPORTED   = ((IB_MR_REREG_ACCESS << 1) - 1)
};

struct ib_fmr_attr {
        int     max_pages;
        int     max_maps;
        u8      page_shift;
};

struct ib_umem;

struct ib_ucontext {
        struct ib_device       *device;
        struct list_head        pd_list;
        struct list_head        mr_list;
        struct list_head        mw_list;
        struct list_head        cq_list;
        struct list_head        qp_list;
        struct list_head        srq_list;
        struct list_head        ah_list;
        struct list_head        xrcd_list;
        struct list_head        rule_list;
        struct list_head        wq_list;
        struct list_head        rwq_ind_tbl_list;
        int                     closing;

        struct pid             *tgid;
#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
        struct rb_root      umem_tree;
        /*
         * Protects .umem_rbroot and tree, as well as odp_mrs_count and
         * mmu notifiers registration.
         */
        struct rw_semaphore     umem_rwsem;
        void (*invalidate_range)(struct ib_umem *umem,
                                 unsigned long start, unsigned long end);

        struct mmu_notifier     mn;
        atomic_t                notifier_count;
        /* A list of umems that don't have private mmu notifier counters yet. */
        struct list_head        no_private_counters;
        int                     odp_mrs_count;
#endif
};

struct ib_uobject {
        u64                     user_handle;    /* handle given to us by userspace */
        struct ib_ucontext     *context;        /* associated user context */
        void                   *object;         /* containing object */
        struct list_head        list;           /* link to context's list */
        int                     id;             /* index into kernel idr */
        struct kref             ref;
        struct rw_semaphore     mutex;          /* protects .live */
        struct rcu_head         rcu;            /* kfree_rcu() overhead */
        int                     live;
};

struct ib_udata {
        const void __user *inbuf;
        void __user *outbuf;
        size_t       inlen;
        size_t       outlen;
};

struct ib_pd {
        u32                     local_dma_lkey;
        u32                     flags;
        struct ib_device       *device;
        struct ib_uobject      *uobject;
        atomic_t                usecnt; /* count all resources */

        u32                     unsafe_global_rkey;

        /*
         * Implementation details of the RDMA core, don't use in drivers:
         */
        struct ib_mr           *__internal_mr;
};

struct ib_xrcd {
        struct ib_device       *device;
        atomic_t                usecnt; /* count all exposed resources */
        struct inode           *inode;

        struct mutex            tgt_qp_mutex;
        struct list_head        tgt_qp_list;
};

struct ib_ah {
        struct ib_device        *device;
        struct ib_pd            *pd;
        struct ib_uobject       *uobject;
};

typedef void (*ib_comp_handler)(struct ib_cq *cq, void *cq_context);

enum ib_poll_context {
        IB_POLL_DIRECT,            /* caller context, no hw completions */
        IB_POLL_SOFTIRQ,           /* poll from softirq context */
        IB_POLL_WORKQUEUE,         /* poll from workqueue */
        IB_POLL_UNBOUND_WORKQUEUE, /* poll from unbound workqueue */
};

struct ib_cq {
        struct ib_device       *device;
        struct ib_uobject      *uobject;
        ib_comp_handler         comp_handler;
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *cq_context;
        int                     cqe;
        atomic_t                usecnt; /* count number of work queues */
        enum ib_poll_context    poll_ctx;
        struct ib_wc            *wc;
        union {
                struct irq_poll         iop;
                struct work_struct      work;
        };
        struct workqueue_struct *comp_wq;
};

struct ib_srq {
        struct ib_device       *device;
        struct ib_pd           *pd;
        struct ib_uobject      *uobject;
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *srq_context;
        enum ib_srq_type        srq_type;
        atomic_t                usecnt;

        union {
                struct {
                        struct ib_xrcd *xrcd;
                        struct ib_cq   *cq;
                        u32             srq_num;
                } xrc;
        } ext;
};

enum ib_wq_type {
        IB_WQT_RQ
};

enum ib_wq_state {
        IB_WQS_RESET,
        IB_WQS_RDY,
        IB_WQS_ERR
};

struct ib_wq {
        struct ib_device       *device;
        struct ib_uobject      *uobject;
        void                *wq_context;
        void                (*event_handler)(struct ib_event *, void *);
        struct ib_pd           *pd;
        struct ib_cq           *cq;
        u32             wq_num;
        enum ib_wq_state       state;
        enum ib_wq_type wq_type;
        atomic_t                usecnt;
};

struct ib_wq_init_attr {
        void                   *wq_context;
        enum ib_wq_type wq_type;
        u32             max_wr;
        u32             max_sge;
        struct  ib_cq          *cq;
        void                (*event_handler)(struct ib_event *, void *);
};

enum ib_wq_attr_mask {
        IB_WQ_STATE     = 1 << 0,
        IB_WQ_CUR_STATE = 1 << 1,
};

struct ib_wq_attr {
        enum    ib_wq_state     wq_state;
        enum    ib_wq_state     curr_wq_state;
};

struct ib_rwq_ind_table {
        struct ib_device        *device;
        struct ib_uobject      *uobject;
        atomic_t                usecnt;
        u32             ind_tbl_num;
        u32             log_ind_tbl_size;
        struct ib_wq    **ind_tbl;
};

struct ib_rwq_ind_table_init_attr {
        u32             log_ind_tbl_size;
        /* Each entry is a pointer to Receive Work Queue */
        struct ib_wq    **ind_tbl;
};

/*
 * @max_write_sge: Maximum SGE elements per RDMA WRITE request.
 * @max_read_sge:  Maximum SGE elements per RDMA READ request.
 */
struct ib_qp {
        struct ib_device       *device;
        struct ib_pd           *pd;
        struct ib_cq           *send_cq;
        struct ib_cq           *recv_cq;
        spinlock_t              mr_lock;
        int                     mrs_used;
        struct list_head        rdma_mrs;
        struct list_head        sig_mrs;
        struct ib_srq          *srq;
        struct ib_xrcd         *xrcd; /* XRC TGT QPs only */
        struct list_head        xrcd_list;

        /* count times opened, mcast attaches, flow attaches */
        atomic_t                usecnt;
        struct list_head        open_list;
        struct ib_qp           *real_qp;
        struct ib_uobject      *uobject;
        void                  (*event_handler)(struct ib_event *, void *);
        void                   *qp_context;
        u32                     qp_num;
        u32                     max_write_sge;
        u32                     max_read_sge;
        enum ib_qp_type         qp_type;
        struct ib_rwq_ind_table *rwq_ind_tbl;
};

struct ib_mr {
        struct ib_device  *device;
        struct ib_pd      *pd;
        u32                lkey;
        u32                rkey;
        u64                iova;
        u32                length;
        unsigned int       page_size;
        bool               need_inval;
        union {
                struct ib_uobject       *uobject;       /* user */
                struct list_head        qp_entry;       /* FR */
        };
};

struct ib_mw {
        struct ib_device        *device;
        struct ib_pd            *pd;
        struct ib_uobject       *uobject;
        u32                     rkey;
        enum ib_mw_type         type;
};

struct ib_fmr {
        struct ib_device        *device;
        struct ib_pd            *pd;
        struct list_head        list;
        u32                     lkey;
        u32                     rkey;
};

/* Supported steering options */
enum ib_flow_attr_type {
        /* steering according to rule specifications */
        IB_FLOW_ATTR_NORMAL             = 0x0,
        /* default unicast and multicast rule -
         * receive all Eth traffic which isn't steered to any QP
         */
        IB_FLOW_ATTR_ALL_DEFAULT        = 0x1,
        /* default multicast rule -
         * receive all Eth multicast traffic which isn't steered to any QP
         */
        IB_FLOW_ATTR_MC_DEFAULT         = 0x2,
        /* sniffer rule - receive all port traffic */
        IB_FLOW_ATTR_SNIFFER            = 0x3
};

/* Supported steering header types */
enum ib_flow_spec_type {
        /* L2 headers*/
        IB_FLOW_SPEC_ETH        = 0x20,
        IB_FLOW_SPEC_IB         = 0x22,
        /* L3 header*/
        IB_FLOW_SPEC_IPV4       = 0x30,
        IB_FLOW_SPEC_IPV6       = 0x31,
        /* L4 headers*/
        IB_FLOW_SPEC_TCP        = 0x40,
        IB_FLOW_SPEC_UDP        = 0x41
};
#define IB_FLOW_SPEC_LAYER_MASK 0xF0
#define IB_FLOW_SPEC_SUPPORT_LAYERS 4

/* Flow steering rule priority is set according to it's domain.
 * Lower domain value means higher priority.
 */
enum ib_flow_domain {
        IB_FLOW_DOMAIN_USER,
        IB_FLOW_DOMAIN_ETHTOOL,
        IB_FLOW_DOMAIN_RFS,
        IB_FLOW_DOMAIN_NIC,
        IB_FLOW_DOMAIN_NUM /* Must be last */
};

enum ib_flow_flags {
        IB_FLOW_ATTR_FLAGS_DONT_TRAP = 1UL << 1, /* Continue match, no steal */
        IB_FLOW_ATTR_FLAGS_RESERVED  = 1UL << 2  /* Must be last */
};

struct ib_flow_eth_filter {
        u8      dst_mac[6];
        u8      src_mac[6];
        __be16  ether_type;
        __be16  vlan_tag;
        /* Must be last */
        u8      real_sz[0];
};

struct ib_flow_spec_eth {
        enum ib_flow_spec_type    type;
        u16                       size;
        struct ib_flow_eth_filter val;
        struct ib_flow_eth_filter mask;
};

struct ib_flow_ib_filter {
        __be16 dlid;
        __u8   sl;
        /* Must be last */
        u8      real_sz[0];
};

struct ib_flow_spec_ib {
        enum ib_flow_spec_type   type;
        u16                      size;
        struct ib_flow_ib_filter val;
        struct ib_flow_ib_filter mask;
};

/* IPv4 header flags */
enum ib_ipv4_flags {
        IB_IPV4_DONT_FRAG = 0x2, /* Don't enable packet fragmentation */
        IB_IPV4_MORE_FRAG = 0X4  /* For All fragmented packets except the
                                    last have this flag set */
};

struct ib_flow_ipv4_filter {
        __be32  src_ip;
        __be32  dst_ip;
        u8      proto;
        u8      tos;
        u8      ttl;
        u8      flags;
        /* Must be last */
        u8      real_sz[0];
};

struct ib_flow_spec_ipv4 {
        enum ib_flow_spec_type     type;
        u16                        size;
        struct ib_flow_ipv4_filter val;
        struct ib_flow_ipv4_filter mask;
};

struct ib_flow_ipv6_filter {
        u8      src_ip[16];
        u8      dst_ip[16];
        __be32  flow_label;
        u8      next_hdr;
        u8      traffic_class;
        u8      hop_limit;
        /* Must be last */
        u8      real_sz[0];
};

struct ib_flow_spec_ipv6 {
        enum ib_flow_spec_type     type;
        u16                        size;
        struct ib_flow_ipv6_filter val;
        struct ib_flow_ipv6_filter mask;
};

struct ib_flow_tcp_udp_filter {
        __be16  dst_port;
        __be16  src_port;
        /* Must be last */
        u8      real_sz[0];
};

struct ib_flow_spec_tcp_udp {
        enum ib_flow_spec_type        type;
        u16                           size;
        struct ib_flow_tcp_udp_filter val;
        struct ib_flow_tcp_udp_filter mask;
};

union ib_flow_spec {
        struct {
                enum ib_flow_spec_type  type;
                u16                     size;
        };
        struct ib_flow_spec_eth         eth;
        struct ib_flow_spec_ib          ib;
        struct ib_flow_spec_ipv4        ipv4;
        struct ib_flow_spec_tcp_udp     tcp_udp;
        struct ib_flow_spec_ipv6        ipv6;
};

struct ib_flow_attr {
        enum ib_flow_attr_type type;
        u16          size;
        u16          priority;
        u32          flags;
        u8           num_of_specs;
        u8           port;
        /* Following are the optional layers according to user request
         * struct ib_flow_spec_xxx
         * struct ib_flow_spec_yyy
         */
};

struct ib_flow {
        struct ib_qp            *qp;
        struct ib_uobject       *uobject;
};

struct ib_mad_hdr;
struct ib_grh;

enum ib_process_mad_flags {
        IB_MAD_IGNORE_MKEY      = 1,
        IB_MAD_IGNORE_BKEY      = 2,
        IB_MAD_IGNORE_ALL       = IB_MAD_IGNORE_MKEY | IB_MAD_IGNORE_BKEY
};

enum ib_mad_result {
        IB_MAD_RESULT_FAILURE  = 0,      /* (!SUCCESS is the important flag) */
        IB_MAD_RESULT_SUCCESS  = 1 << 0, /* MAD was successfully processed   */
        IB_MAD_RESULT_REPLY    = 1 << 1, /* Reply packet needs to be sent    */
        IB_MAD_RESULT_CONSUMED = 1 << 2  /* Packet consumed: stop processing */
};

#define IB_DEVICE_NAME_MAX 64

struct ib_cache {
        rwlock_t                lock;
        struct ib_event_handler event_handler;
        struct ib_pkey_cache  **pkey_cache;
        struct ib_gid_table   **gid_cache;
        u8                     *lmc_cache;
};

struct ib_dma_mapping_ops {
        int             (*mapping_error)(struct ib_device *dev,
                                         u64 dma_addr);
        u64             (*map_single)(struct ib_device *dev,
                                      void *ptr, size_t size,
                                      enum dma_data_direction direction);
        void            (*unmap_single)(struct ib_device *dev,
                                        u64 addr, size_t size,
                                        enum dma_data_direction direction);
        u64             (*map_page)(struct ib_device *dev,
                                    struct page *page, unsigned long offset,
                                    size_t size,
                                    enum dma_data_direction direction);
        void            (*unmap_page)(struct ib_device *dev,
                                      u64 addr, size_t size,
                                      enum dma_data_direction direction);
        int             (*map_sg)(struct ib_device *dev,
                                  struct scatterlist *sg, int nents,
                                  enum dma_data_direction direction);
        void            (*unmap_sg)(struct ib_device *dev,
                                    struct scatterlist *sg, int nents,
                                    enum dma_data_direction direction);
        int             (*map_sg_attrs)(struct ib_device *dev,
                                        struct scatterlist *sg, int nents,
                                        enum dma_data_direction direction,
                                        unsigned long attrs);
        void            (*unmap_sg_attrs)(struct ib_device *dev,
                                          struct scatterlist *sg, int nents,
                                          enum dma_data_direction direction,
                                          unsigned long attrs);
        void            (*sync_single_for_cpu)(struct ib_device *dev,
                                               u64 dma_handle,
                                               size_t size,
                                               enum dma_data_direction dir);
        void            (*sync_single_for_device)(struct ib_device *dev,
                                                  u64 dma_handle,
                                                  size_t size,
                                                  enum dma_data_direction dir);
        void            *(*alloc_coherent)(struct ib_device *dev,
                                           size_t size,
                                           u64 *dma_handle,
                                           gfp_t flag);
        void            (*free_coherent)(struct ib_device *dev,
                                         size_t size, void *cpu_addr,
                                         u64 dma_handle);
};

struct iw_cm_verbs;

struct ib_port_immutable {
        int                           pkey_tbl_len;
        int                           gid_tbl_len;
        u32                           core_cap_flags;
        u32                           max_mad_size;
};

struct ib_device {
        struct device                *dma_device;

        char                          name[IB_DEVICE_NAME_MAX];

        struct list_head              event_handler_list;
        spinlock_t                    event_handler_lock;

        spinlock_t                    client_data_lock;
        struct list_head              core_list;
        /* Access to the client_data_list is protected by the client_data_lock
         * spinlock and the lists_rwsem read-write semaphore */
        struct list_head              client_data_list;

        struct ib_cache               cache;
        /**
         * port_immutable is indexed by port number
         */
        struct ib_port_immutable     *port_immutable;

        int                           num_comp_vectors;

        struct iw_cm_verbs           *iwcm;

        /**
         * alloc_hw_stats - Allocate a struct rdma_hw_stats and fill in the
         *   driver initialized data.  The struct is kfree()'ed by the sysfs
         *   core when the device is removed.  A lifespan of -1 in the return
         *   struct tells the core to set a default lifespan.
         */
        struct rdma_hw_stats      *(*alloc_hw_stats)(struct ib_device *device,
                                                     u8 port_num);
        /**
         * get_hw_stats - Fill in the counter value(s) in the stats struct.
         * @index - The index in the value array we wish to have updated, or
         *   num_counters if we want all stats updated
         * Return codes -
         *   < 0 - Error, no counters updated
         *   index - Updated the single counter pointed to by index
         *   num_counters - Updated all counters (will reset the timestamp
         *     and prevent further calls for lifespan milliseconds)
         * Drivers are allowed to update all counters in leiu of just the
         *   one given in index at their option
         */
        int                        (*get_hw_stats)(struct ib_device *device,
                                                   struct rdma_hw_stats *stats,
                                                   u8 port, int index);
        int                        (*query_device)(struct ib_device *device,
                                                   struct ib_device_attr *device_attr,
                                                   struct ib_udata *udata);
        int                        (*query_port)(struct ib_device *device,
                                                 u8 port_num,
                                                 struct ib_port_attr *port_attr);
        enum rdma_link_layer       (*get_link_layer)(struct ib_device *device,
                                                     u8 port_num);
        /* When calling get_netdev, the HW vendor's driver should return the
         * net device of device @device at port @port_num or NULL if such
         * a net device doesn't exist. The vendor driver should call dev_hold
         * on this net device. The HW vendor's device driver must guarantee
         * that this function returns NULL before the net device reaches
         * NETDEV_UNREGISTER_FINAL state.
         */
        struct net_device         *(*get_netdev)(struct ib_device *device,
                                                 u8 port_num);
        int                        (*query_gid)(struct ib_device *device,
                                                u8 port_num, int index,
                                                union ib_gid *gid);
        /* When calling add_gid, the HW vendor's driver should
         * add the gid of device @device at gid index @index of
         * port @port_num to be @gid. Meta-info of that gid (for example,
         * the network device related to this gid is available
         * at @attr. @context allows the HW vendor driver to store extra
         * information together with a GID entry. The HW vendor may allocate
         * memory to contain this information and store it in @context when a
         * new GID entry is written to. Params are consistent until the next
         * call of add_gid or delete_gid. The function should return 0 on
         * success or error otherwise. The function could be called
         * concurrently for different ports. This function is only called
         * when roce_gid_table is used.
         */
        int                        (*add_gid)(struct ib_device *device,
                                              u8 port_num,
                                              unsigned int index,
                                              const union ib_gid *gid,
                                              const struct ib_gid_attr *attr,
                                              void **context);
        /* When calling del_gid, the HW vendor's driver should delete the
         * gid of device @device at gid index @index of port @port_num.
         * Upon the deletion of a GID entry, the HW vendor must free any
         * allocated memory. The caller will clear @context afterwards.
         * This function is only called when roce_gid_table is used.
         */
        int                        (*del_gid)(struct ib_device *device,
                                              u8 port_num,
                                              unsigned int index,
                                              void **context);
        int                        (*query_pkey)(struct ib_device *device,
                                                 u8 port_num, u16 index, u16 *pkey);
        int                        (*modify_device)(struct ib_device *device,
                                                    int device_modify_mask,
                                                    struct ib_device_modify *device_modify);
        int                        (*modify_port)(struct ib_device *device,
                                                  u8 port_num, int port_modify_mask,
                                                  struct ib_port_modify *port_modify);
        struct ib_ucontext *       (*alloc_ucontext)(struct ib_device *device,
                                                     struct ib_udata *udata);
        int                        (*dealloc_ucontext)(struct ib_ucontext *context);
        int                        (*mmap)(struct ib_ucontext *context,
                                           struct vm_area_struct *vma);
        struct ib_pd *             (*alloc_pd)(struct ib_device *device,
                                               struct ib_ucontext *context,
                                               struct ib_udata *udata);
        int                        (*dealloc_pd)(struct ib_pd *pd);
        struct ib_ah *             (*create_ah)(struct ib_pd *pd,
                                                struct ib_ah_attr *ah_attr);
        int                        (*modify_ah)(struct ib_ah *ah,
                                                struct ib_ah_attr *ah_attr);
        int                        (*query_ah)(struct ib_ah *ah,
                                               struct ib_ah_attr *ah_attr);
        int                        (*destroy_ah)(struct ib_ah *ah);
        struct ib_srq *            (*create_srq)(struct ib_pd *pd,
                                                 struct ib_srq_init_attr *srq_init_attr,
                                                 struct ib_udata *udata);
        int                        (*modify_srq)(struct ib_srq *srq,
                                                 struct ib_srq_attr *srq_attr,
                                                 enum ib_srq_attr_mask srq_attr_mask,
                                                 struct ib_udata *udata);
        int                        (*query_srq)(struct ib_srq *srq,
                                                struct ib_srq_attr *srq_attr);
        int                        (*destroy_srq)(struct ib_srq *srq);
        int                        (*post_srq_recv)(struct ib_srq *srq,
                                                    struct ib_recv_wr *recv_wr,
                                                    struct ib_recv_wr **bad_recv_wr);
        struct ib_qp *             (*create_qp)(struct ib_pd *pd,
                                                struct ib_qp_init_attr *qp_init_attr,
                                                struct ib_udata *udata);
        int                        (*modify_qp)(struct ib_qp *qp,
                                                struct ib_qp_attr *qp_attr,
                                                int qp_attr_mask,
                                                struct ib_udata *udata);
        int                        (*query_qp)(struct ib_qp *qp,
                                               struct ib_qp_attr *qp_attr,
                                               int qp_attr_mask,
                                               struct ib_qp_init_attr *qp_init_attr);
        int                        (*destroy_qp)(struct ib_qp *qp);
        int                        (*post_send)(struct ib_qp *qp,
                                                struct ib_send_wr *send_wr,
                                                struct ib_send_wr **bad_send_wr);
        int                        (*post_recv)(struct ib_qp *qp,
                                                struct ib_recv_wr *recv_wr,
                                                struct ib_recv_wr **bad_recv_wr);
        struct ib_cq *             (*create_cq)(struct ib_device *device,
                                                const struct ib_cq_init_attr *attr,
                                                struct ib_ucontext *context,
                                                struct ib_udata *udata);
        int                        (*modify_cq)(struct ib_cq *cq, u16 cq_count,
                                                u16 cq_period);
        int                        (*destroy_cq)(struct ib_cq *cq);
        int                        (*resize_cq)(struct ib_cq *cq, int cqe,
                                                struct ib_udata *udata);
        int                        (*poll_cq)(struct ib_cq *cq, int num_entries,
                                              struct ib_wc *wc);
        int                        (*peek_cq)(struct ib_cq *cq, int wc_cnt);
        int                        (*req_notify_cq)(struct ib_cq *cq,
                                                    enum ib_cq_notify_flags flags);
        int                        (*req_ncomp_notif)(struct ib_cq *cq,
                                                      int wc_cnt);
        struct ib_mr *             (*get_dma_mr)(struct ib_pd *pd,
                                                 int mr_access_flags);
        struct ib_mr *             (*reg_user_mr)(struct ib_pd *pd,
                                                  u64 start, u64 length,
                                                  u64 virt_addr,
                                                  int mr_access_flags,
                                                  struct ib_udata *udata);
        int                        (*rereg_user_mr)(struct ib_mr *mr,
                                                    int flags,
                                                    u64 start, u64 length,
                                                    u64 virt_addr,
                                                    int mr_access_flags,
                                                    struct ib_pd *pd,
                                                    struct ib_udata *udata);
        int                        (*dereg_mr)(struct ib_mr *mr);
        struct ib_mr *             (*alloc_mr)(struct ib_pd *pd,
                                               enum ib_mr_type mr_type,
                                               u32 max_num_sg);
        int                        (*map_mr_sg)(struct ib_mr *mr,
                                                struct scatterlist *sg,
                                                int sg_nents,
                                                unsigned int *sg_offset);
        struct ib_mw *             (*alloc_mw)(struct ib_pd *pd,
                                               enum ib_mw_type type,
                                               struct ib_udata *udata);
        int                        (*dealloc_mw)(struct ib_mw *mw);
        struct ib_fmr *            (*alloc_fmr)(struct ib_pd *pd,
                                                int mr_access_flags,
                                                struct ib_fmr_attr *fmr_attr);
        int                        (*map_phys_fmr)(struct ib_fmr *fmr,
                                                   u64 *page_list, int list_len,
                                                   u64 iova);
        int                        (*unmap_fmr)(struct list_head *fmr_list);
        int                        (*dealloc_fmr)(struct ib_fmr *fmr);
        int                        (*attach_mcast)(struct ib_qp *qp,
                                                   union ib_gid *gid,
                                                   u16 lid);
        int                        (*detach_mcast)(struct ib_qp *qp,
                                                   union ib_gid *gid,
                                                   u16 lid);
        int                        (*process_mad)(struct ib_device *device,
                                                  int process_mad_flags,
                                                  u8 port_num,
                                                  const struct ib_wc *in_wc,
                                                  const struct ib_grh *in_grh,
                                                  const struct ib_mad_hdr *in_mad,
                                                  size_t in_mad_size,
                                                  struct ib_mad_hdr *out_mad,
                                                  size_t *out_mad_size,
                                                  u16 *out_mad_pkey_index);
        struct ib_xrcd *           (*alloc_xrcd)(struct ib_device *device,
                                                 struct ib_ucontext *ucontext,
                                                 struct ib_udata *udata);
        int                        (*dealloc_xrcd)(struct ib_xrcd *xrcd);
        struct ib_flow *           (*create_flow)(struct ib_qp *qp,
                                                  struct ib_flow_attr
                                                  *flow_attr,
                                                  int domain);
        int                        (*destroy_flow)(struct ib_flow *flow_id);
        int                        (*check_mr_status)(struct ib_mr *mr, u32 check_mask,
                                                      struct ib_mr_status *mr_status);
        void                       (*disassociate_ucontext)(struct ib_ucontext *ibcontext);
        void                       (*drain_rq)(struct ib_qp *qp);
        void                       (*drain_sq)(struct ib_qp *qp);
        int                        (*set_vf_link_state)(struct ib_device *device, int vf, u8 port,
                                                        int state);
        int                        (*get_vf_config)(struct ib_device *device, int vf, u8 port,
                                                   struct ifla_vf_info *ivf);
        int                        (*get_vf_stats)(struct ib_device *device, int vf, u8 port,
                                                   struct ifla_vf_stats *stats);
        int                        (*set_vf_guid)(struct ib_device *device, int vf, u8 port, u64 guid,
                                                  int type);
        struct ib_wq *             (*create_wq)(struct ib_pd *pd,
                                                struct ib_wq_init_attr *init_attr,
                                                struct ib_udata *udata);
        int                        (*destroy_wq)(struct ib_wq *wq);
        int                        (*modify_wq)(struct ib_wq *wq,
                                                struct ib_wq_attr *attr,
                                                u32 wq_attr_mask,
                                                struct ib_udata *udata);
        struct ib_rwq_ind_table *  (*create_rwq_ind_table)(struct ib_device *device,
                                                           struct ib_rwq_ind_table_init_attr *init_attr,
                                                           struct ib_udata *udata);
        int                        (*destroy_rwq_ind_table)(struct ib_rwq_ind_table *wq_ind_table);
        struct ib_dma_mapping_ops   *dma_ops;

        struct module               *owner;
        struct device                dev;
        struct kobject               *ports_parent;
        struct list_head             port_list;

        enum {
                IB_DEV_UNINITIALIZED,
                IB_DEV_REGISTERED,
                IB_DEV_UNREGISTERED
        }                            reg_state;

        int                          uverbs_abi_ver;
        u64                          uverbs_cmd_mask;
        u64                          uverbs_ex_cmd_mask;

        char                         node_desc[IB_DEVICE_NODE_DESC_MAX];
        __be64                       node_guid;
        u32                          local_dma_lkey;
        u16                          is_switch:1;
        u8                           node_type;
        u8                           phys_port_cnt;
        struct ib_device_attr        attrs;
        struct attribute_group       *hw_stats_ag;
        struct rdma_hw_stats         *hw_stats;

        /**
         * The following mandatory functions are used only at device
         * registration.  Keep functions such as these at the end of this
         * structure to avoid cache line misses when accessing struct ib_device
         * in fast paths.
         */
        int (*get_port_immutable)(struct ib_device *, u8, struct ib_port_immutable *);
        void (*get_dev_fw_str)(struct ib_device *, char *str, size_t str_len);
};

struct ib_client {
        char  *name;
        void (*add)   (struct ib_device *);
        void (*remove)(struct ib_device *, void *client_data);

        /* Returns the net_dev belonging to this ib_client and matching the
         * given parameters.
         * @dev:         An RDMA device that the net_dev use for communication.
         * @port:        A physical port number on the RDMA device.
         * @pkey:        P_Key that the net_dev uses if applicable.
         * @gid:         A GID that the net_dev uses to communicate.
         * @addr:        An IP address the net_dev is configured with.
         * @client_data: The device's client data set by ib_set_client_data().
         *
         * An ib_client that implements a net_dev on top of RDMA devices
         * (such as IP over IB) should implement this callback, allowing the
         * rdma_cm module to find the right net_dev for a given request.
         *
         * The caller is responsible for calling dev_put on the returned
         * netdev. */
        struct net_device *(*get_net_dev_by_params)(
                        struct ib_device *dev,
                        u8 port,
                        u16 pkey,
                        const union ib_gid *gid,
                        const struct sockaddr *addr,
                        void *client_data);
        struct list_head list;
};

struct ib_device *ib_alloc_device(size_t size);
void ib_dealloc_device(struct ib_device *device);

void ib_get_device_fw_str(struct ib_device *device, char *str, size_t str_len);

int ib_register_device(struct ib_device *device,
                       int (*port_callback)(struct ib_device *,
                                            u8, struct kobject *));
void ib_unregister_device(struct ib_device *device);

int ib_register_client   (struct ib_client *client);
void ib_unregister_client(struct ib_client *client);

void *ib_get_client_data(struct ib_device *device, struct ib_client *client);
void  ib_set_client_data(struct ib_device *device, struct ib_client *client,
                         void *data);

static inline int ib_copy_from_udata(void *dest, struct ib_udata *udata, size_t len)
{
        return copy_from_user(dest, udata->inbuf, len) ? -EFAULT : 0;
}

static inline int ib_copy_to_udata(struct ib_udata *udata, void *src, size_t len)
{
        return copy_to_user(udata->outbuf, src, len) ? -EFAULT : 0;
}

static inline bool ib_is_udata_cleared(struct ib_udata *udata,
                                       size_t offset,
                                       size_t len)
{
        const void __user *p = udata->inbuf + offset;
        bool ret;
        u8 *buf;

        if (len > USHRT_MAX)
                return false;

        buf = memdup_user(p, len);
        if (IS_ERR(buf))
                return false;

        ret = !memchr_inv(buf, 0, len);
        kfree(buf);
        return ret;
}

/**
 * ib_modify_qp_is_ok - Check that the supplied attribute mask
 * contains all required attributes and no attributes not allowed for
 * the given QP state transition.
 * @cur_state: Current QP state
 * @next_state: Next QP state
 * @type: QP type
 * @mask: Mask of supplied QP attributes
 * @ll : link layer of port
 *
 * This function is a helper function that a low-level driver's
 * modify_qp method can use to validate the consumer's input.  It
 * checks that cur_state and next_state are valid QP states, that a
 * transition from cur_state to next_state is allowed by the IB spec,
 * and that the attribute mask supplied is allowed for the transition.
 */
int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
                       enum ib_qp_type type, enum ib_qp_attr_mask mask,
                       enum rdma_link_layer ll);

int ib_register_event_handler  (struct ib_event_handler *event_handler);
int ib_unregister_event_handler(struct ib_event_handler *event_handler);
void ib_dispatch_event(struct ib_event *event);

int ib_query_port(struct ib_device *device,
                  u8 port_num, struct ib_port_attr *port_attr);

enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device,
                                               u8 port_num);

/**
 * rdma_cap_ib_switch - Check if the device is IB switch
 * @device: Device to check
 *
 * Device driver is responsible for setting is_switch bit on
 * in ib_device structure at init time.
 *
 * Return: true if the device is IB switch.
 */
static inline bool rdma_cap_ib_switch(const struct ib_device *device)
{
        return device->is_switch;
}

/**
 * rdma_start_port - Return the first valid port number for the device
 * specified
 *
 * @device: Device to be checked
 *
 * Return start port number
 */
static inline u8 rdma_start_port(const struct ib_device *device)
{
        return rdma_cap_ib_switch(device) ? 0 : 1;
}

/**
 * rdma_end_port - Return the last valid port number for the device
 * specified
 *
 * @device: Device to be checked
 *
 * Return last port number
 */
static inline u8 rdma_end_port(const struct ib_device *device)
{
        return rdma_cap_ib_switch(device) ? 0 : device->phys_port_cnt;
}

static inline bool rdma_protocol_ib(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_PROT_IB;
}

static inline bool rdma_protocol_roce(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags &
                (RDMA_CORE_CAP_PROT_ROCE | RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP);
}

static inline bool rdma_protocol_roce_udp_encap(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP;
}

static inline bool rdma_protocol_roce_eth_encap(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_PROT_ROCE;
}

static inline bool rdma_protocol_iwarp(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_PROT_IWARP;
}

static inline bool rdma_ib_or_roce(const struct ib_device *device, u8 port_num)
{
        return rdma_protocol_ib(device, port_num) ||
                rdma_protocol_roce(device, port_num);
}

/**
 * rdma_cap_ib_mad - Check if the port of a device supports Infiniband
 * Management Datagrams.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * Management Datagrams (MAD) are a required part of the InfiniBand
 * specification and are supported on all InfiniBand devices.  A slightly
 * extended version are also supported on OPA interfaces.
 *
 * Return: true if the port supports sending/receiving of MAD packets.
 */
static inline bool rdma_cap_ib_mad(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_IB_MAD;
}

/**
 * rdma_cap_opa_mad - Check if the port of device provides support for OPA
 * Management Datagrams.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * Intel OmniPath devices extend and/or replace the InfiniBand Management
 * datagrams with their own versions.  These OPA MADs share many but not all of
 * the characteristics of InfiniBand MADs.
 *
 * OPA MADs differ in the following ways:
 *
 *    1) MADs are variable size up to 2K
 *       IBTA defined MADs remain fixed at 256 bytes
 *    2) OPA SMPs must carry valid PKeys
 *    3) OPA SMP packets are a different format
 *
 * Return: true if the port supports OPA MAD packet formats.
 */
static inline bool rdma_cap_opa_mad(struct ib_device *device, u8 port_num)
{
        return (device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_OPA_MAD)
                == RDMA_CORE_CAP_OPA_MAD;
}

/**
 * rdma_cap_ib_smi - Check if the port of a device provides an Infiniband
 * Subnet Management Agent (SMA) on the Subnet Management Interface (SMI).
 * @device: Device to check
 * @port_num: Port number to check
 *
 * Each InfiniBand node is required to provide a Subnet Management Agent
 * that the subnet manager can access.  Prior to the fabric being fully
 * configured by the subnet manager, the SMA is accessed via a well known
 * interface called the Subnet Management Interface (SMI).  This interface
 * uses directed route packets to communicate with the SM to get around the
 * chicken and egg problem of the SM needing to know what's on the fabric
 * in order to configure the fabric, and needing to configure the fabric in
 * order to send packets to the devices on the fabric.  These directed
 * route packets do not need the fabric fully configured in order to reach
 * their destination.  The SMI is the only method allowed to send
 * directed route packets on an InfiniBand fabric.
 *
 * Return: true if the port provides an SMI.
 */
static inline bool rdma_cap_ib_smi(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_IB_SMI;
}

/**
 * rdma_cap_ib_cm - Check if the port of device has the capability Infiniband
 * Communication Manager.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * The InfiniBand Communication Manager is one of many pre-defined General
 * Service Agents (GSA) that are accessed via the General Service
 * Interface (GSI).  It's role is to facilitate establishment of connections
 * between nodes as well as other management related tasks for established
 * connections.
 *
 * Return: true if the port supports an IB CM (this does not guarantee that
 * a CM is actually running however).
 */
static inline bool rdma_cap_ib_cm(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_IB_CM;
}

/**
 * rdma_cap_iw_cm - Check if the port of device has the capability IWARP
 * Communication Manager.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * Similar to above, but specific to iWARP connections which have a different
 * managment protocol than InfiniBand.
 *
 * Return: true if the port supports an iWARP CM (this does not guarantee that
 * a CM is actually running however).
 */
static inline bool rdma_cap_iw_cm(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_IW_CM;
}

/**
 * rdma_cap_ib_sa - Check if the port of device has the capability Infiniband
 * Subnet Administration.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * An InfiniBand Subnet Administration (SA) service is a pre-defined General
 * Service Agent (GSA) provided by the Subnet Manager (SM).  On InfiniBand
 * fabrics, devices should resolve routes to other hosts by contacting the
 * SA to query the proper route.
 *
 * Return: true if the port should act as a client to the fabric Subnet
 * Administration interface.  This does not imply that the SA service is
 * running locally.
 */
static inline bool rdma_cap_ib_sa(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_IB_SA;
}

/**
 * rdma_cap_ib_mcast - Check if the port of device has the capability Infiniband
 * Multicast.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * InfiniBand multicast registration is more complex than normal IPv4 or
 * IPv6 multicast registration.  Each Host Channel Adapter must register
 * with the Subnet Manager when it wishes to join a multicast group.  It
 * should do so only once regardless of how many queue pairs it subscribes
 * to this group.  And it should leave the group only after all queue pairs
 * attached to the group have been detached.
 *
 * Return: true if the port must undertake the additional adminstrative
 * overhead of registering/unregistering with the SM and tracking of the
 * total number of queue pairs attached to the multicast group.
 */
static inline bool rdma_cap_ib_mcast(const struct ib_device *device, u8 port_num)
{
        return rdma_cap_ib_sa(device, port_num);
}

/**
 * rdma_cap_af_ib - Check if the port of device has the capability
 * Native Infiniband Address.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * InfiniBand addressing uses a port's GUID + Subnet Prefix to make a default
 * GID.  RoCE uses a different mechanism, but still generates a GID via
 * a prescribed mechanism and port specific data.
 *
 * Return: true if the port uses a GID address to identify devices on the
 * network.
 */
static inline bool rdma_cap_af_ib(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_AF_IB;
}

/**
 * rdma_cap_eth_ah - Check if the port of device has the capability
 * Ethernet Address Handle.
 * @device: Device to check
 * @port_num: Port number to check
 *
 * RoCE is InfiniBand over Ethernet, and it uses a well defined technique
 * to fabricate GIDs over Ethernet/IP specific addresses native to the
 * port.  Normally, packet headers are generated by the sending host
 * adapter, but when sending connectionless datagrams, we must manually
 * inject the proper headers for the fabric we are communicating over.
 *
 * Return: true if we are running as a RoCE port and must force the
 * addition of a Global Route Header built from our Ethernet Address
 * Handle into our header list for connectionless packets.
 */
static inline bool rdma_cap_eth_ah(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].core_cap_flags & RDMA_CORE_CAP_ETH_AH;
}

/**
 * rdma_max_mad_size - Return the max MAD size required by this RDMA Port.
 *
 * @device: Device
 * @port_num: Port number
 *
 * This MAD size includes the MAD headers and MAD payload.  No other headers
 * are included.
 *
 * Return the max MAD size required by the Port.  Will return 0 if the port
 * does not support MADs
 */
static inline size_t rdma_max_mad_size(const struct ib_device *device, u8 port_num)
{
        return device->port_immutable[port_num].max_mad_size;
}

/**
 * rdma_cap_roce_gid_table - Check if the port of device uses roce_gid_table
 * @device: Device to check
 * @port_num: Port number to check
 *
 * RoCE GID table mechanism manages the various GIDs for a device.
 *
 * NOTE: if allocating the port's GID table has failed, this call will still
 * return true, but any RoCE GID table API will fail.
 *
 * Return: true if the port uses RoCE GID table mechanism in order to manage
 * its GIDs.
 */
static inline bool rdma_cap_roce_gid_table(const struct ib_device *device,
                                           u8 port_num)
{
        return rdma_protocol_roce(device, port_num) &&
                device->add_gid && device->del_gid;
}

/*
 * Check if the device supports READ W/ INVALIDATE.
 */
static inline bool rdma_cap_read_inv(struct ib_device *dev, u32 port_num)
{
        /*
         * iWarp drivers must support READ W/ INVALIDATE.  No other protocol
         * has support for it yet.
         */
        return rdma_protocol_iwarp(dev, port_num);
}

int ib_query_gid(struct ib_device *device,
                 u8 port_num, int index, union ib_gid *gid,
                 struct ib_gid_attr *attr);

int ib_set_vf_link_state(struct ib_device *device, int vf, u8 port,
                         int state);
int ib_get_vf_config(struct ib_device *device, int vf, u8 port,
                     struct ifla_vf_info *info);
int ib_get_vf_stats(struct ib_device *device, int vf, u8 port,
                    struct ifla_vf_stats *stats);
int ib_set_vf_guid(struct ib_device *device, int vf, u8 port, u64 guid,
                   int type);

int ib_query_pkey(struct ib_device *device,
                  u8 port_num, u16 index, u16 *pkey);

int ib_modify_device(struct ib_device *device,
                     int device_modify_mask,
                     struct ib_device_modify *device_modify);

int ib_modify_port(struct ib_device *device,
                   u8 port_num, int port_modify_mask,
                   struct ib_port_modify *port_modify);

int ib_find_gid(struct ib_device *device, union ib_gid *gid,
                enum ib_gid_type gid_type, struct net_device *ndev,
                u8 *port_num, u16 *index);

int ib_find_pkey(struct ib_device *device,
                 u8 port_num, u16 pkey, u16 *index);

enum ib_pd_flags {
        /*
         * Create a memory registration for all memory in the system and place
         * the rkey for it into pd->unsafe_global_rkey.  This can be used by
         * ULPs to avoid the overhead of dynamic MRs.
         *
         * This flag is generally considered unsafe and must only be used in
         * extremly trusted environments.  Every use of it will log a warning
         * in the kernel log.
         */
        IB_PD_UNSAFE_GLOBAL_RKEY        = 0x01,
};

struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags,
                const char *caller);
#define ib_alloc_pd(device, flags) \
        __ib_alloc_pd((device), (flags), __func__)
void ib_dealloc_pd(struct ib_pd *pd);

/**
 * ib_create_ah - Creates an address handle for the given address vector.
 * @pd: The protection domain associated with the address handle.
 * @ah_attr: The attributes of the address vector.
 *
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr);

/**
 * ib_init_ah_from_wc - Initializes address handle attributes from a
 *   work completion.
 * @device: Device on which the received message arrived.
 * @port_num: Port on which the received message arrived.
 * @wc: Work completion associated with the received message.
 * @grh: References the received global route header.  This parameter is
 *   ignored unless the work completion indicates that the GRH is valid.
 * @ah_attr: Returned attributes that can be used when creating an address
 *   handle for replying to the message.
 */
int ib_init_ah_from_wc(struct ib_device *device, u8 port_num,
                       const struct ib_wc *wc, const struct ib_grh *grh,
                       struct ib_ah_attr *ah_attr);

/**
 * ib_create_ah_from_wc - Creates an address handle associated with the
 *   sender of the specified work completion.
 * @pd: The protection domain associated with the address handle.
 * @wc: Work completion information associated with a received message.
 * @grh: References the received global route header.  This parameter is
 *   ignored unless the work completion indicates that the GRH is valid.
 * @port_num: The outbound port number to associate with the address.
 *
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
                                   const struct ib_grh *grh, u8 port_num);

/**
 * ib_modify_ah - Modifies the address vector associated with an address
 *   handle.
 * @ah: The address handle to modify.
 * @ah_attr: The new address vector attributes to associate with the
 *   address handle.
 */
int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr);

/**
 * ib_query_ah - Queries the address vector associated with an address
 *   handle.
 * @ah: The address handle to query.
 * @ah_attr: The address vector attributes associated with the address
 *   handle.
 */
int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr);

/**
 * ib_destroy_ah - Destroys an address handle.
 * @ah: The address handle to destroy.
 */
int ib_destroy_ah(struct ib_ah *ah);

/**
 * ib_create_srq - Creates a SRQ associated with the specified protection
 *   domain.
 * @pd: The protection domain associated with the SRQ.
 * @srq_init_attr: A list of initial attributes required to create the
 *   SRQ.  If SRQ creation succeeds, then the attributes are updated to
 *   the actual capabilities of the created SRQ.
 *
 * srq_attr->max_wr and srq_attr->max_sge are read the determine the
 * requested size of the SRQ, and set to the actual values allocated
 * on return.  If ib_create_srq() succeeds, then max_wr and max_sge
 * will always be at least as large as the requested values.
 */
struct ib_srq *ib_create_srq(struct ib_pd *pd,
                             struct ib_srq_init_attr *srq_init_attr);

/**
 * ib_modify_srq - Modifies the attributes for the specified SRQ.
 * @srq: The SRQ to modify.
 * @srq_attr: On input, specifies the SRQ attributes to modify.  On output,
 *   the current values of selected SRQ attributes are returned.
 * @srq_attr_mask: A bit-mask used to specify which attributes of the SRQ
 *   are being modified.
 *
 * The mask may contain IB_SRQ_MAX_WR to resize the SRQ and/or
 * IB_SRQ_LIMIT to set the SRQ's limit and request notification when
 * the number of receives queued drops below the limit.
 */
int ib_modify_srq(struct ib_srq *srq,
                  struct ib_srq_attr *srq_attr,
                  enum ib_srq_attr_mask srq_attr_mask);

/**
 * ib_query_srq - Returns the attribute list and current values for the
 *   specified SRQ.
 * @srq: The SRQ to query.
 * @srq_attr: The attributes of the specified SRQ.
 */
int ib_query_srq(struct ib_srq *srq,
                 struct ib_srq_attr *srq_attr);

/**
 * ib_destroy_srq - Destroys the specified SRQ.
 * @srq: The SRQ to destroy.
 */
int ib_destroy_srq(struct ib_srq *srq);

/**
 * ib_post_srq_recv - Posts a list of work requests to the specified SRQ.
 * @srq: The SRQ to post the work request on.
 * @recv_wr: A list of work requests to post on the receive queue.
 * @bad_recv_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_srq_recv(struct ib_srq *srq,
                                   struct ib_recv_wr *recv_wr,
                                   struct ib_recv_wr **bad_recv_wr)
{
        return srq->device->post_srq_recv(srq, recv_wr, bad_recv_wr);
}

/**
 * ib_create_qp - Creates a QP associated with the specified protection
 *   domain.
 * @pd: The protection domain associated with the QP.
 * @qp_init_attr: A list of initial attributes required to create the
 *   QP.  If QP creation succeeds, then the attributes are updated to
 *   the actual capabilities of the created QP.
 */
struct ib_qp *ib_create_qp(struct ib_pd *pd,
                           struct ib_qp_init_attr *qp_init_attr);

/**
 * ib_modify_qp - Modifies the attributes for the specified QP and then
 *   transitions the QP to the given state.
 * @qp: The QP to modify.
 * @qp_attr: On input, specifies the QP attributes to modify.  On output,
 *   the current values of selected QP attributes are returned.
 * @qp_attr_mask: A bit-mask used to specify which attributes of the QP
 *   are being modified.
 */
int ib_modify_qp(struct ib_qp *qp,
                 struct ib_qp_attr *qp_attr,
                 int qp_attr_mask);

/**
 * ib_query_qp - Returns the attribute list and current values for the
 *   specified QP.
 * @qp: The QP to query.
 * @qp_attr: The attributes of the specified QP.
 * @qp_attr_mask: A bit-mask used to select specific attributes to query.
 * @qp_init_attr: Additional attributes of the selected QP.
 *
 * The qp_attr_mask may be used to limit the query to gathering only the
 * selected attributes.
 */
int ib_query_qp(struct ib_qp *qp,
                struct ib_qp_attr *qp_attr,
                int qp_attr_mask,
                struct ib_qp_init_attr *qp_init_attr);

/**
 * ib_destroy_qp - Destroys the specified QP.
 * @qp: The QP to destroy.
 */
int ib_destroy_qp(struct ib_qp *qp);

/**
 * ib_open_qp - Obtain a reference to an existing sharable QP.
 * @xrcd - XRC domain
 * @qp_open_attr: Attributes identifying the QP to open.
 *
 * Returns a reference to a sharable QP.
 */
struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd,
                         struct ib_qp_open_attr *qp_open_attr);

/**
 * ib_close_qp - Release an external reference to a QP.
 * @qp: The QP handle to release
 *
 * The opened QP handle is released by the caller.  The underlying
 * shared QP is not destroyed until all internal references are released.
 */
int ib_close_qp(struct ib_qp *qp);

/**
 * ib_post_send - Posts a list of work requests to the send queue of
 *   the specified QP.
 * @qp: The QP to post the work request on.
 * @send_wr: A list of work requests to post on the send queue.
 * @bad_send_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 *
 * While IBA Vol. 1 section 11.4.1.1 specifies that if an immediate
 * error is returned, the QP state shall not be affected,
 * ib_post_send() will return an immediate error after queueing any
 * earlier work requests in the list.
 */
static inline int ib_post_send(struct ib_qp *qp,
                               struct ib_send_wr *send_wr,
                               struct ib_send_wr **bad_send_wr)
{
        return qp->device->post_send(qp, send_wr, bad_send_wr);
}

/**
 * ib_post_recv - Posts a list of work requests to the receive queue of
 *   the specified QP.
 * @qp: The QP to post the work request on.
 * @recv_wr: A list of work requests to post on the receive queue.
 * @bad_recv_wr: On an immediate failure, this parameter will reference
 *   the work request that failed to be posted on the QP.
 */
static inline int ib_post_recv(struct ib_qp *qp,
                               struct ib_recv_wr *recv_wr,
                               struct ib_recv_wr **bad_recv_wr)
{
        return qp->device->post_recv(qp, recv_wr, bad_recv_wr);
}

struct ib_cq *ib_alloc_cq(struct ib_device *dev, void *private,
                int nr_cqe, int comp_vector, enum ib_poll_context poll_ctx);
void ib_free_cq(struct ib_cq *cq);
int ib_process_cq_direct(struct ib_cq *cq, int budget);

/**
 * ib_create_cq - Creates a CQ on the specified device.
 * @device: The device on which to create the CQ.
 * @comp_handler: A user-specified callback that is invoked when a
 *   completion event occurs on the CQ.
 * @event_handler: A user-specified callback that is invoked when an
 *   asynchronous event not associated with a completion occurs on the CQ.
 * @cq_context: Context associated with the CQ returned to the user via
 *   the associated completion and event handlers.
 * @cq_attr: The attributes the CQ should be created upon.
 *
 * Users can examine the cq structure to determine the actual CQ size.
 */
struct ib_cq *ib_create_cq(struct ib_device *device,
                           ib_comp_handler comp_handler,
                           void (*event_handler)(struct ib_event *, void *),
                           void *cq_context,
                           const struct ib_cq_init_attr *cq_attr);

/**
 * ib_resize_cq - Modifies the capacity of the CQ.
 * @cq: The CQ to resize.
 * @cqe: The minimum size of the CQ.
 *
 * Users can examine the cq structure to determine the actual CQ size.
 */
int ib_resize_cq(struct ib_cq *cq, int cqe);

/**
 * ib_modify_cq - Modifies moderation params of the CQ
 * @cq: The CQ to modify.
 * @cq_count: number of CQEs that will trigger an event
 * @cq_period: max period of time in usec before triggering an event
 *
 */
int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period);

/**
 * ib_destroy_cq - Destroys the specified CQ.
 * @cq: The CQ to destroy.
 */
int ib_destroy_cq(struct ib_cq *cq);

/**
 * ib_poll_cq - poll a CQ for completion(s)
 * @cq:the CQ being polled
 * @num_entries:maximum number of completions to return
 * @wc:array of at least @num_entries &struct ib_wc where completions
 *   will be returned
 *
 * Poll a CQ for (possibly multiple) completions.  If the return value
 * is < 0, an error occurred.  If the return value is >= 0, it is the
 * number of completions returned.  If the return value is
 * non-negative and < num_entries, then the CQ was emptied.
 */
static inline int ib_poll_cq(struct ib_cq *cq, int num_entries,
                             struct ib_wc *wc)
{
        return cq->device->poll_cq(cq, num_entries, wc);
}

/**
 * ib_peek_cq - Returns the number of unreaped completions currently
 *   on the specified CQ.
 * @cq: The CQ to peek.
 * @wc_cnt: A minimum number of unreaped completions to check for.
 *
 * If the number of unreaped completions is greater than or equal to wc_cnt,
 * this function returns wc_cnt, otherwise, it returns the actual number of
 * unreaped completions.
 */
int ib_peek_cq(struct ib_cq *cq, int wc_cnt);

/**
 * ib_req_notify_cq - Request completion notification on a CQ.
 * @cq: The CQ to generate an event for.
 * @flags:
 *   Must contain exactly one of %IB_CQ_SOLICITED or %IB_CQ_NEXT_COMP
 *   to request an event on the next solicited event or next work
 *   completion at any type, respectively. %IB_CQ_REPORT_MISSED_EVENTS
 *   may also be |ed in to request a hint about missed events, as
 *   described below.
 *
 * Return Value:
 *    < 0 means an error occurred while requesting notification
 *   == 0 means notification was requested successfully, and if
 *        IB_CQ_REPORT_MISSED_EVENTS was passed in, then no events
 *        were missed and it is safe to wait for another event.  In
 *        this case is it guaranteed that any work completions added
 *        to the CQ since the last CQ poll will trigger a completion
 *        notification event.
 *    > 0 is only returned if IB_CQ_REPORT_MISSED_EVENTS was passed
 *        in.  It means that the consumer must poll the CQ again to
 *        make sure it is empty to avoid missing an event because of a
 *        race between requesting notification and an entry being
 *        added to the CQ.  This return value means it is possible
 *        (but not guaranteed) that a work completion has been added
 *        to the CQ since the last poll without triggering a
 *        completion notification event.
 */
static inline int ib_req_notify_cq(struct ib_cq *cq,
                                   enum ib_cq_notify_flags flags)
{
        return cq->device->req_notify_cq(cq, flags);
}

/**
 * ib_req_ncomp_notif - Request completion notification when there are
 *   at least the specified number of unreaped completions on the CQ.
 * @cq: The CQ to generate an event for.
 * @wc_cnt: The number of unreaped completions that should be on the
 *   CQ before an event is generated.
 */
static inline int ib_req_ncomp_notif(struct ib_cq *cq, int wc_cnt)
{
        return cq->device->req_ncomp_notif ?
                cq->device->req_ncomp_notif(cq, wc_cnt) :
                -ENOSYS;
}

/**
 * ib_dma_mapping_error - check a DMA addr for error
 * @dev: The device for which the dma_addr was created
 * @dma_addr: The DMA address to check
 */
static inline int ib_dma_mapping_error(struct ib_device *dev, u64 dma_addr)
{
        if (dev->dma_ops)
                return dev->dma_ops->mapping_error(dev, dma_addr);
        return dma_mapping_error(dev->dma_device, dma_addr);
}

/**
 * ib_dma_map_single - Map a kernel virtual address to DMA address
 * @dev: The device for which the dma_addr is to be created
 * @cpu_addr: The kernel virtual address
 * @size: The size of the region in bytes
 * @direction: The direction of the DMA
 */
static inline u64 ib_dma_map_single(struct ib_device *dev,
                                    void *cpu_addr, size_t size,
                                    enum dma_data_direction direction)
{
        if (dev->dma_ops)
                return dev->dma_ops->map_single(dev, cpu_addr, size, direction);
        return dma_map_single(dev->dma_device, cpu_addr, size, direction);
}

/**
 * ib_dma_unmap_single - Destroy a mapping created by ib_dma_map_single()
 * @dev: The device for which the DMA address was created
 * @addr: The DMA address
 * @size: The size of the region in bytes
 * @direction: The direction of the DMA
 */
static inline void ib_dma_unmap_single(struct ib_device *dev,
                                       u64 addr, size_t size,
                                       enum dma_data_direction direction)
{
        if (dev->dma_ops)
                dev->dma_ops->unmap_single(dev, addr, size, direction);
        else
                dma_unmap_single(dev->dma_device, addr, size, direction);
}

static inline u64 ib_dma_map_single_attrs(struct ib_device *dev,
                                          void *cpu_addr, size_t size,
                                          enum dma_data_direction direction,
                                          unsigned long dma_attrs)
{
        return dma_map_single_attrs(dev->dma_device, cpu_addr, size,
                                    direction, dma_attrs);
}

static inline void ib_dma_unmap_single_attrs(struct ib_device *dev,
                                             u64 addr, size_t size,
                                             enum dma_data_direction direction,
                                             unsigned long dma_attrs)
{
        return dma_unmap_single_attrs(dev->dma_device, addr, size,
                                      direction, dma_attrs);
}

/**
 * ib_dma_map_page - Map a physical page to DMA address
 * @dev: The device for which the dma_addr is to be created
 * @page: The page to be mapped
 * @offset: The offset within the page
 * @size: The size of the region in bytes
 * @direction: The direction of the DMA
 */
static inline u64 ib_dma_map_page(struct ib_device *dev,
                                  struct page *page,
                                  unsigned long offset,
                                  size_t size,
                                         enum dma_data_direction direction)
{
        if (dev->dma_ops)
                return dev->dma_ops->map_page(dev, page, offset, size, direction);
        return dma_map_page(dev->dma_device, page, offset, size, direction);
}

/**
 * ib_dma_unmap_page - Destroy a mapping created by ib_dma_map_page()
 * @dev: The device for which the DMA address was created
 * @addr: The DMA address
 * @size: The size of the region in bytes
 * @direction: The direction of the DMA
 */
static inline void ib_dma_unmap_page(struct ib_device *dev,
                                     u64 addr, size_t size,
                                     enum dma_data_direction direction)
{
        if (dev->dma_ops)
                dev->dma_ops->unmap_page(dev, addr, size, direction);
        else
                dma_unmap_page(dev->dma_device, addr, size, direction);
}

/**
 * ib_dma_map_sg - Map a scatter/gather list to DMA addresses
 * @dev: The device for which the DMA addresses are to be created
 * @sg: The array of scatter/gather entries
 * @nents: The number of scatter/gather entries
 * @direction: The direction of the DMA
 */
static inline int ib_dma_map_sg(struct ib_device *dev,
                                struct scatterlist *sg, int nents,
                                enum dma_data_direction direction)
{
        if (dev->dma_ops)
                return dev->dma_ops->map_sg(dev, sg, nents, direction);
        return dma_map_sg(dev->dma_device, sg, nents, direction);
}

/**
 * ib_dma_unmap_sg - Unmap a scatter/gather list of DMA addresses
 * @dev: The device for which the DMA addresses were created
 * @sg: The array of scatter/gather entries
 * @nents: The number of scatter/gather entries
 * @direction: The direction of the DMA
 */
static inline void ib_dma_unmap_sg(struct ib_device *dev,
                                   struct scatterlist *sg, int nents,
                                   enum dma_data_direction direction)
{
        if (dev->dma_ops)
                dev->dma_ops->unmap_sg(dev, sg, nents, direction);
        else
                dma_unmap_sg(dev->dma_device, sg, nents, direction);
}

static inline int ib_dma_map_sg_attrs(struct ib_device *dev,
                                      struct scatterlist *sg, int nents,
                                      enum dma_data_direction direction,
                                      unsigned long dma_attrs)
{
        if (dev->dma_ops)
                return dev->dma_ops->map_sg_attrs(dev, sg, nents, direction,
                                                  dma_attrs);
        else
                return dma_map_sg_attrs(dev->dma_device, sg, nents, direction,
                                        dma_attrs);
}

static inline void ib_dma_unmap_sg_attrs(struct ib_device *dev,
                                         struct scatterlist *sg, int nents,
                                         enum dma_data_direction direction,
                                         unsigned long dma_attrs)
{
        if (dev->dma_ops)
                return dev->dma_ops->unmap_sg_attrs(dev, sg, nents, direction,
                                                  dma_attrs);
        else
                dma_unmap_sg_attrs(dev->dma_device, sg, nents, direction,
                                   dma_attrs);
}
/**
 * ib_sg_dma_address - Return the DMA address from a scatter/gather entry
 * @dev: The device for which the DMA addresses were created
 * @sg: The scatter/gather entry
 *
 * Note: this function is obsolete. To do: change all occurrences of
 * ib_sg_dma_address() into sg_dma_address().
 */
static inline u64 ib_sg_dma_address(struct ib_device *dev,
                                    struct scatterlist *sg)
{
        return sg_dma_address(sg);
}

/**
 * ib_sg_dma_len - Return the DMA length from a scatter/gather entry
 * @dev: The device for which the DMA addresses were created
 * @sg: The scatter/gather entry
 *
 * Note: this function is obsolete. To do: change all occurrences of
 * ib_sg_dma_len() into sg_dma_len().
 */
static inline unsigned int ib_sg_dma_len(struct ib_device *dev,
                                         struct scatterlist *sg)
{
        return sg_dma_len(sg);
}

/**
 * ib_dma_sync_single_for_cpu - Prepare DMA region to be accessed by CPU
 * @dev: The device for which the DMA address was created
 * @addr: The DMA address
 * @size: The size of the region in bytes
 * @dir: The direction of the DMA
 */
static inline void ib_dma_sync_single_for_cpu(struct ib_device *dev,
                                              u64 addr,
                                              size_t size,
                                              enum dma_data_direction dir)
{
        if (dev->dma_ops)
                dev->dma_ops->sync_single_for_cpu(dev, addr, size, dir);
        else
                dma_sync_single_for_cpu(dev->dma_device, addr, size, dir);
}

/**
 * ib_dma_sync_single_for_device - Prepare DMA region to be accessed by device
 * @dev: The device for which the DMA address was created
 * @addr: The DMA address
 * @size: The size of the region in bytes
 * @dir: The direction of the DMA
 */
static inline void ib_dma_sync_single_for_device(struct ib_device *dev,
                                                 u64 addr,
                                                 size_t size,
                                                 enum dma_data_direction dir)
{
        if (dev->dma_ops)
                dev->dma_ops->sync_single_for_device(dev, addr, size, dir);
        else
                dma_sync_single_for_device(dev->dma_device, addr, size, dir);
}

/**
 * ib_dma_alloc_coherent - Allocate memory and map it for DMA
 * @dev: The device for which the DMA address is requested
 * @size: The size of the region to allocate in bytes
 * @dma_handle: A pointer for returning the DMA address of the region
 * @flag: memory allocator flags
 */
static inline void *ib_dma_alloc_coherent(struct ib_device *dev,
                                           size_t size,
                                           u64 *dma_handle,
                                           gfp_t flag)
{
        if (dev->dma_ops)
                return dev->dma_ops->alloc_coherent(dev, size, dma_handle, flag);
        else {
                dma_addr_t handle;
                void *ret;

                ret = dma_alloc_coherent(dev->dma_device, size, &handle, flag);
                *dma_handle = handle;
                return ret;
        }
}

/**
 * ib_dma_free_coherent - Free memory allocated by ib_dma_alloc_coherent()
 * @dev: The device for which the DMA addresses were allocated
 * @size: The size of the region
 * @cpu_addr: the address returned by ib_dma_alloc_coherent()
 * @dma_handle: the DMA address returned by ib_dma_alloc_coherent()
 */
static inline void ib_dma_free_coherent(struct ib_device *dev,
                                        size_t size, void *cpu_addr,
                                        u64 dma_handle)
{
        if (dev->dma_ops)
                dev->dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
        else
                dma_free_coherent(dev->dma_device, size, cpu_addr, dma_handle);
}

/**
 * ib_dereg_mr - Deregisters a memory region and removes it from the
 *   HCA translation table.
 * @mr: The memory region to deregister.
 *
 * This function can fail, if the memory region has memory windows bound to it.
 */
int ib_dereg_mr(struct ib_mr *mr);

struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
                          enum ib_mr_type mr_type,
                          u32 max_num_sg);

/**
 * ib_update_fast_reg_key - updates the key portion of the fast_reg MR
 *   R_Key and L_Key.
 * @mr - struct ib_mr pointer to be updated.
 * @newkey - new key to be used.
 */
static inline void ib_update_fast_reg_key(struct ib_mr *mr, u8 newkey)
{
        mr->lkey = (mr->lkey & 0xffffff00) | newkey;
        mr->rkey = (mr->rkey & 0xffffff00) | newkey;
}

/**
 * ib_inc_rkey - increments the key portion of the given rkey. Can be used
 * for calculating a new rkey for type 2 memory windows.
 * @rkey - the rkey to increment.
 */
static inline u32 ib_inc_rkey(u32 rkey)
{
        const u32 mask = 0x000000ff;
        return ((rkey + 1) & mask) | (rkey & ~mask);
}

/**
 * ib_alloc_fmr - Allocates a unmapped fast memory region.
 * @pd: The protection domain associated with the unmapped region.
 * @mr_access_flags: Specifies the memory access rights.
 * @fmr_attr: Attributes of the unmapped region.
 *
 * A fast memory region must be mapped before it can be used as part of
 * a work request.
 */
struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
                            int mr_access_flags,
                            struct ib_fmr_attr *fmr_attr);

/**
 * ib_map_phys_fmr - Maps a list of physical pages to a fast memory region.
 * @fmr: The fast memory region to associate with the pages.
 * @page_list: An array of physical pages to map to the fast memory region.
 * @list_len: The number of pages in page_list.
 * @iova: The I/O virtual address to use with the mapped region.
 */
static inline int ib_map_phys_fmr(struct ib_fmr *fmr,
                                  u64 *page_list, int list_len,
                                  u64 iova)
{
        return fmr->device->map_phys_fmr(fmr, page_list, list_len, iova);
}

/**
 * ib_unmap_fmr - Removes the mapping from a list of fast memory regions.
 * @fmr_list: A linked list of fast memory regions to unmap.
 */
int ib_unmap_fmr(struct list_head *fmr_list);

/**
 * ib_dealloc_fmr - Deallocates a fast memory region.
 * @fmr: The fast memory region to deallocate.
 */
int ib_dealloc_fmr(struct ib_fmr *fmr);

/**
 * ib_attach_mcast - Attaches the specified QP to a multicast group.
 * @qp: QP to attach to the multicast group.  The QP must be type
 *   IB_QPT_UD.
 * @gid: Multicast group GID.
 * @lid: Multicast group LID in host byte order.
 *
 * In order to send and receive multicast packets, subnet
 * administration must have created the multicast group and configured
 * the fabric appropriately.  The port associated with the specified
 * QP must also be a member of the multicast group.
 */
int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);

/**
 * ib_detach_mcast - Detaches the specified QP from a multicast group.
 * @qp: QP to detach from the multicast group.
 * @gid: Multicast group GID.
 * @lid: Multicast group LID in host byte order.
 */
int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid);

/**
 * ib_alloc_xrcd - Allocates an XRC domain.
 * @device: The device on which to allocate the XRC domain.
 */
struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device);

/**
 * ib_dealloc_xrcd - Deallocates an XRC domain.
 * @xrcd: The XRC domain to deallocate.
 */
int ib_dealloc_xrcd(struct ib_xrcd *xrcd);

struct ib_flow *ib_create_flow(struct ib_qp *qp,
                               struct ib_flow_attr *flow_attr, int domain);
int ib_destroy_flow(struct ib_flow *flow_id);

static inline int ib_check_mr_access(int flags)
{
        /*
         * Local write permission is required if remote write or
         * remote atomic permission is also requested.
         */
        if (flags & (IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_REMOTE_WRITE) &&
            !(flags & IB_ACCESS_LOCAL_WRITE))
                return -EINVAL;

        return 0;
}

static inline bool ib_access_writable(int access_flags)
{
        /*
         * We have writable memory backing the MR if any of the following
         * access flags are set.  "Local write" and "remote write" obviously
         * require write access.  "Remote atomic" can do things like fetch and
         * add, which will modify memory, and "MW bind" can change permissions
         * by binding a window.
         */
        return access_flags &
                (IB_ACCESS_LOCAL_WRITE   | IB_ACCESS_REMOTE_WRITE |
                 IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND);
}

/**
 * ib_check_mr_status: lightweight check of MR status.
 *     This routine may provide status checks on a selected
 *     ib_mr. first use is for signature status check.
 *
 * @mr: A memory region.
 * @check_mask: Bitmask of which checks to perform from
 *     ib_mr_status_check enumeration.
 * @mr_status: The container of relevant status checks.
 *     failed checks will be indicated in the status bitmask
 *     and the relevant info shall be in the error item.
 */
int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
                       struct ib_mr_status *mr_status);

struct net_device *ib_get_net_dev_by_params(struct ib_device *dev, u8 port,
                                            u16 pkey, const union ib_gid *gid,
                                            const struct sockaddr *addr);
struct ib_wq *ib_create_wq(struct ib_pd *pd,
                           struct ib_wq_init_attr *init_attr);
int ib_destroy_wq(struct ib_wq *wq);
int ib_modify_wq(struct ib_wq *wq, struct ib_wq_attr *attr,
                 u32 wq_attr_mask);
struct ib_rwq_ind_table *ib_create_rwq_ind_table(struct ib_device *device,
                                                 struct ib_rwq_ind_table_init_attr*
                                                 wq_ind_table_init_attr);
int ib_destroy_rwq_ind_table(struct ib_rwq_ind_table *wq_ind_table);

int ib_map_mr_sg(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
                 unsigned int *sg_offset, unsigned int page_size);

static inline int
ib_map_mr_sg_zbva(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
                  unsigned int *sg_offset, unsigned int page_size)
{
        int n;

        n = ib_map_mr_sg(mr, sg, sg_nents, sg_offset, page_size);
        mr->iova = 0;

        return n;
}

int ib_sg_to_pages(struct ib_mr *mr, struct scatterlist *sgl, int sg_nents,
                unsigned int *sg_offset, int (*set_page)(struct ib_mr *, u64));

void ib_drain_rq(struct ib_qp *qp);
void ib_drain_sq(struct ib_qp *qp);
void ib_drain_qp(struct ib_qp *qp);
#endif /* IB_VERBS_H */