interconnect: qcom: sdm845: Walk the list safely on node removal

[linux/fpc-iii.git] / include / rdma / ib_mad.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) 2004-2006 Voltaire Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#if !defined(IB_MAD_H)
#define IB_MAD_H

#include <linux/list.h>

#include <rdma/ib_verbs.h>
#include <uapi/rdma/ib_user_mad.h>

/* Management base versions */
#define IB_MGMT_BASE_VERSION                    1
#define OPA_MGMT_BASE_VERSION                   0x80

#define OPA_SM_CLASS_VERSION                    0x80

/* Management classes */
#define IB_MGMT_CLASS_SUBN_LID_ROUTED           0x01
#define IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE       0x81
#define IB_MGMT_CLASS_SUBN_ADM                  0x03
#define IB_MGMT_CLASS_PERF_MGMT                 0x04
#define IB_MGMT_CLASS_BM                        0x05
#define IB_MGMT_CLASS_DEVICE_MGMT               0x06
#define IB_MGMT_CLASS_CM                        0x07
#define IB_MGMT_CLASS_SNMP                      0x08
#define IB_MGMT_CLASS_DEVICE_ADM                0x10
#define IB_MGMT_CLASS_BOOT_MGMT                 0x11
#define IB_MGMT_CLASS_BIS                       0x12
#define IB_MGMT_CLASS_CONG_MGMT                 0x21
#define IB_MGMT_CLASS_VENDOR_RANGE2_START       0x30
#define IB_MGMT_CLASS_VENDOR_RANGE2_END         0x4F

#define IB_OPENIB_OUI                           (0x001405)

/* Management methods */
#define IB_MGMT_METHOD_GET                      0x01
#define IB_MGMT_METHOD_SET                      0x02
#define IB_MGMT_METHOD_GET_RESP                 0x81
#define IB_MGMT_METHOD_SEND                     0x03
#define IB_MGMT_METHOD_TRAP                     0x05
#define IB_MGMT_METHOD_REPORT                   0x06
#define IB_MGMT_METHOD_REPORT_RESP              0x86
#define IB_MGMT_METHOD_TRAP_REPRESS             0x07

#define IB_MGMT_METHOD_RESP                     0x80
#define IB_BM_ATTR_MOD_RESP                     cpu_to_be32(1)

#define IB_MGMT_MAX_METHODS                     128

/* MAD Status field bit masks */
#define IB_MGMT_MAD_STATUS_SUCCESS                      0x0000
#define IB_MGMT_MAD_STATUS_BUSY                         0x0001
#define IB_MGMT_MAD_STATUS_REDIRECT_REQD                0x0002
#define IB_MGMT_MAD_STATUS_BAD_VERSION                  0x0004
#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD           0x0008
#define IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB    0x000c
#define IB_MGMT_MAD_STATUS_INVALID_ATTRIB_VALUE         0x001c

/* RMPP information */
#define IB_MGMT_RMPP_VERSION                    1

#define IB_MGMT_RMPP_TYPE_DATA                  1
#define IB_MGMT_RMPP_TYPE_ACK                   2
#define IB_MGMT_RMPP_TYPE_STOP                  3
#define IB_MGMT_RMPP_TYPE_ABORT                 4

#define IB_MGMT_RMPP_FLAG_ACTIVE                1
#define IB_MGMT_RMPP_FLAG_FIRST                 (1<<1)
#define IB_MGMT_RMPP_FLAG_LAST                  (1<<2)

#define IB_MGMT_RMPP_NO_RESPTIME                0x1F

#define IB_MGMT_RMPP_STATUS_SUCCESS             0
#define IB_MGMT_RMPP_STATUS_RESX                1
#define IB_MGMT_RMPP_STATUS_ABORT_MIN           118
#define IB_MGMT_RMPP_STATUS_T2L                 118
#define IB_MGMT_RMPP_STATUS_BAD_LEN             119
#define IB_MGMT_RMPP_STATUS_BAD_SEG             120
#define IB_MGMT_RMPP_STATUS_BADT                121
#define IB_MGMT_RMPP_STATUS_W2S                 122
#define IB_MGMT_RMPP_STATUS_S2B                 123
#define IB_MGMT_RMPP_STATUS_BAD_STATUS          124
#define IB_MGMT_RMPP_STATUS_UNV                 125
#define IB_MGMT_RMPP_STATUS_TMR                 126
#define IB_MGMT_RMPP_STATUS_UNSPEC              127
#define IB_MGMT_RMPP_STATUS_ABORT_MAX           127

#define IB_QP0          0
#define IB_QP1          cpu_to_be32(1)
#define IB_QP1_QKEY     0x80010000
#define IB_QP_SET_QKEY  0x80000000

#define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
#define IB_DEFAULT_PKEY_FULL    0xFFFF

/*
 * Generic trap/notice types
 */
#define IB_NOTICE_TYPE_FATAL    0x80
#define IB_NOTICE_TYPE_URGENT   0x81
#define IB_NOTICE_TYPE_SECURITY 0x82
#define IB_NOTICE_TYPE_SM       0x83
#define IB_NOTICE_TYPE_INFO     0x84

/*
 * Generic trap/notice producers
 */
#define IB_NOTICE_PROD_CA               cpu_to_be16(1)
#define IB_NOTICE_PROD_SWITCH           cpu_to_be16(2)
#define IB_NOTICE_PROD_ROUTER           cpu_to_be16(3)
#define IB_NOTICE_PROD_CLASS_MGR        cpu_to_be16(4)

enum {
        IB_MGMT_MAD_HDR = 24,
        IB_MGMT_MAD_DATA = 232,
        IB_MGMT_RMPP_HDR = 36,
        IB_MGMT_RMPP_DATA = 220,
        IB_MGMT_VENDOR_HDR = 40,
        IB_MGMT_VENDOR_DATA = 216,
        IB_MGMT_SA_HDR = 56,
        IB_MGMT_SA_DATA = 200,
        IB_MGMT_DEVICE_HDR = 64,
        IB_MGMT_DEVICE_DATA = 192,
        IB_MGMT_MAD_SIZE = IB_MGMT_MAD_HDR + IB_MGMT_MAD_DATA,
        OPA_MGMT_MAD_DATA = 2024,
        OPA_MGMT_RMPP_DATA = 2012,
        OPA_MGMT_MAD_SIZE = IB_MGMT_MAD_HDR + OPA_MGMT_MAD_DATA,
};

struct ib_mad_hdr {
        u8      base_version;
        u8      mgmt_class;
        u8      class_version;
        u8      method;
        __be16  status;
        __be16  class_specific;
        __be64  tid;
        __be16  attr_id;
        __be16  resv;
        __be32  attr_mod;
};

struct ib_rmpp_hdr {
        u8      rmpp_version;
        u8      rmpp_type;
        u8      rmpp_rtime_flags;
        u8      rmpp_status;
        __be32  seg_num;
        __be32  paylen_newwin;
};

typedef u64 __bitwise ib_sa_comp_mask;

#define IB_SA_COMP_MASK(n) ((__force ib_sa_comp_mask) cpu_to_be64(1ull << (n)))

/*
 * ib_sa_hdr and ib_sa_mad structures must be packed because they have
 * 64-bit fields that are only 32-bit aligned. 64-bit architectures will
 * lay them out wrong otherwise.  (And unfortunately they are sent on
 * the wire so we can't change the layout)
 */
struct ib_sa_hdr {
        __be64                  sm_key;
        __be16                  attr_offset;
        __be16                  reserved;
        ib_sa_comp_mask         comp_mask;
} __packed;

struct ib_mad {
        struct ib_mad_hdr       mad_hdr;
        u8                      data[IB_MGMT_MAD_DATA];
};

struct opa_mad {
        struct ib_mad_hdr       mad_hdr;
        u8                      data[OPA_MGMT_MAD_DATA];
};

struct ib_rmpp_mad {
        struct ib_mad_hdr       mad_hdr;
        struct ib_rmpp_hdr      rmpp_hdr;
        u8                      data[IB_MGMT_RMPP_DATA];
};

struct opa_rmpp_mad {
        struct ib_mad_hdr       mad_hdr;
        struct ib_rmpp_hdr      rmpp_hdr;
        u8                      data[OPA_MGMT_RMPP_DATA];
};

struct ib_sa_mad {
        struct ib_mad_hdr       mad_hdr;
        struct ib_rmpp_hdr      rmpp_hdr;
        struct ib_sa_hdr        sa_hdr;
        u8                      data[IB_MGMT_SA_DATA];
} __packed;

struct ib_vendor_mad {
        struct ib_mad_hdr       mad_hdr;
        struct ib_rmpp_hdr      rmpp_hdr;
        u8                      reserved;
        u8                      oui[3];
        u8                      data[IB_MGMT_VENDOR_DATA];
};

#define IB_MGMT_CLASSPORTINFO_ATTR_ID   cpu_to_be16(0x0001)

#define IB_CLASS_PORT_INFO_RESP_TIME_MASK       0x1F
#define IB_CLASS_PORT_INFO_RESP_TIME_FIELD_SIZE 5

struct ib_class_port_info {
        u8                      base_version;
        u8                      class_version;
        __be16                  capability_mask;
          /* 27 bits for cap_mask2, 5 bits for resp_time */
        __be32                  cap_mask2_resp_time;
        u8                      redirect_gid[16];
        __be32                  redirect_tcslfl;
        __be16                  redirect_lid;
        __be16                  redirect_pkey;
        __be32                  redirect_qp;
        __be32                  redirect_qkey;
        u8                      trap_gid[16];
        __be32                  trap_tcslfl;
        __be16                  trap_lid;
        __be16                  trap_pkey;
        __be32                  trap_hlqp;
        __be32                  trap_qkey;
};

/* PortInfo CapabilityMask */
enum ib_port_capability_mask_bits {
        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_CAP_MASK2_SUP = 1 << 15,
        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_OTHER_LOCAL_CHANGES_SUP = 1 << 26,
        IB_PORT_LINK_SPEED_WIDTH_TABLE_SUP = 1 << 27,
        IB_PORT_VENDOR_SPECIFIC_MADS_TABLE_SUP = 1 << 28,
        IB_PORT_MCAST_PKEY_TRAP_SUPPRESSION_SUP = 1 << 29,
        IB_PORT_MCAST_FDB_TOP_SUP = 1 << 30,
        IB_PORT_HIERARCHY_INFO_SUP = 1ULL << 31,
};

enum ib_port_capability_mask2_bits {
        IB_PORT_SET_NODE_DESC_SUP               = 1 << 0,
        IB_PORT_EX_PORT_INFO_EX_SUP             = 1 << 1,
        IB_PORT_VIRT_SUP                        = 1 << 2,
        IB_PORT_SWITCH_PORT_STATE_TABLE_SUP     = 1 << 3,
        IB_PORT_LINK_WIDTH_2X_SUP               = 1 << 4,
        IB_PORT_LINK_SPEED_HDR_SUP              = 1 << 5,
};

#define OPA_CLASS_PORT_INFO_PR_SUPPORT BIT(26)

struct opa_class_port_info {
        u8 base_version;
        u8 class_version;
        __be16 cap_mask;
        __be32 cap_mask2_resp_time;

        u8 redirect_gid[16];
        __be32 redirect_tc_fl;
        __be32 redirect_lid;
        __be32 redirect_sl_qp;
        __be32 redirect_qkey;

        u8 trap_gid[16];
        __be32 trap_tc_fl;
        __be32 trap_lid;
        __be32 trap_hl_qp;
        __be32 trap_qkey;

        __be16 trap_pkey;
        __be16 redirect_pkey;

        u8 trap_sl_rsvd;
        u8 reserved[3];
} __packed;

/**
 * ib_get_cpi_resp_time - Returns the resp_time value from
 * cap_mask2_resp_time in ib_class_port_info.
 * @cpi: A struct ib_class_port_info mad.
 */
static inline u8 ib_get_cpi_resp_time(struct ib_class_port_info *cpi)
{
        return (u8)(be32_to_cpu(cpi->cap_mask2_resp_time) &
                    IB_CLASS_PORT_INFO_RESP_TIME_MASK);
}

/**
 * ib_set_cpi_resptime - Sets the response time in an
 * ib_class_port_info mad.
 * @cpi: A struct ib_class_port_info.
 * @rtime: The response time to set.
 */
static inline void ib_set_cpi_resp_time(struct ib_class_port_info *cpi,
                                        u8 rtime)
{
        cpi->cap_mask2_resp_time =
                (cpi->cap_mask2_resp_time &
                 cpu_to_be32(~IB_CLASS_PORT_INFO_RESP_TIME_MASK)) |
                cpu_to_be32(rtime & IB_CLASS_PORT_INFO_RESP_TIME_MASK);
}

/**
 * ib_get_cpi_capmask2 - Returns the capmask2 value from
 * cap_mask2_resp_time in ib_class_port_info.
 * @cpi: A struct ib_class_port_info mad.
 */
static inline u32 ib_get_cpi_capmask2(struct ib_class_port_info *cpi)
{
        return (be32_to_cpu(cpi->cap_mask2_resp_time) >>
                IB_CLASS_PORT_INFO_RESP_TIME_FIELD_SIZE);
}

/**
 * ib_set_cpi_capmask2 - Sets the capmask2 in an
 * ib_class_port_info mad.
 * @cpi: A struct ib_class_port_info.
 * @capmask2: The capmask2 to set.
 */
static inline void ib_set_cpi_capmask2(struct ib_class_port_info *cpi,
                                       u32 capmask2)
{
        cpi->cap_mask2_resp_time =
                (cpi->cap_mask2_resp_time &
                 cpu_to_be32(IB_CLASS_PORT_INFO_RESP_TIME_MASK)) |
                cpu_to_be32(capmask2 <<
                            IB_CLASS_PORT_INFO_RESP_TIME_FIELD_SIZE);
}

/**
 * opa_get_cpi_capmask2 - Returns the capmask2 value from
 * cap_mask2_resp_time in ib_class_port_info.
 * @cpi: A struct opa_class_port_info mad.
 */
static inline u32 opa_get_cpi_capmask2(struct opa_class_port_info *cpi)
{
        return (be32_to_cpu(cpi->cap_mask2_resp_time) >>
                IB_CLASS_PORT_INFO_RESP_TIME_FIELD_SIZE);
}

struct ib_mad_notice_attr {
        u8 generic_type;
        u8 prod_type_msb;
        __be16 prod_type_lsb;
        __be16 trap_num;
        __be16 issuer_lid;
        __be16 toggle_count;

        union {
                struct {
                        u8      details[54];
                } raw_data;

                struct {
                        __be16  reserved;
                        __be16  lid;            /* where violation happened */
                        u8      port_num;       /* where violation happened */
                } __packed ntc_129_131;

                struct {
                        __be16  reserved;
                        __be16  lid;            /* LID where change occurred */
                        u8      reserved2;
                        u8      local_changes;  /* low bit - local changes */
                        __be32  new_cap_mask;   /* new capability mask */
                        u8      reserved3;
                        u8      change_flags;   /* low 3 bits only */
                } __packed ntc_144;

                struct {
                        __be16  reserved;
                        __be16  lid;            /* lid where sys guid changed */
                        __be16  reserved2;
                        __be64  new_sys_guid;
                } __packed ntc_145;

                struct {
                        __be16  reserved;
                        __be16  lid;
                        __be16  dr_slid;
                        u8      method;
                        u8      reserved2;
                        __be16  attr_id;
                        __be32  attr_mod;
                        __be64  mkey;
                        u8      reserved3;
                        u8      dr_trunc_hop;
                        u8      dr_rtn_path[30];
                } __packed ntc_256;

                struct {
                        __be16          reserved;
                        __be16          lid1;
                        __be16          lid2;
                        __be32          key;
                        __be32          sl_qp1; /* SL: high 4 bits */
                        __be32          qp2;    /* high 8 bits reserved */
                        union ib_gid    gid1;
                        union ib_gid    gid2;
                } __packed ntc_257_258;

        } details;
};

/**
 * ib_mad_send_buf - MAD data buffer and work request for sends.
 * @next: A pointer used to chain together MADs for posting.
 * @mad: References an allocated MAD data buffer for MADs that do not have
 *   RMPP active.  For MADs using RMPP, references the common and management
 *   class specific headers.
 * @mad_agent: MAD agent that allocated the buffer.
 * @ah: The address handle to use when sending the MAD.
 * @context: User-controlled context fields.
 * @hdr_len: Indicates the size of the data header of the MAD.  This length
 *   includes the common MAD, RMPP, and class specific headers.
 * @data_len: Indicates the total size of user-transferred data.
 * @seg_count: The number of RMPP segments allocated for this send.
 * @seg_size: Size of the data in each RMPP segment.  This does not include
 *   class specific headers.
 * @seg_rmpp_size: Size of each RMPP segment including the class specific
 *   headers.
 * @timeout_ms: Time to wait for a response.
 * @retries: Number of times to retry a request for a response.  For MADs
 *   using RMPP, this applies per window.  On completion, returns the number
 *   of retries needed to complete the transfer.
 *
 * Users are responsible for initializing the MAD buffer itself, with the
 * exception of any RMPP header.  Additional segment buffer space allocated
 * beyond data_len is padding.
 */
struct ib_mad_send_buf {
        struct ib_mad_send_buf  *next;
        void                    *mad;
        struct ib_mad_agent     *mad_agent;
        struct ib_ah            *ah;
        void                    *context[2];
        int                     hdr_len;
        int                     data_len;
        int                     seg_count;
        int                     seg_size;
        int                     seg_rmpp_size;
        int                     timeout_ms;
        int                     retries;
};

/**
 * ib_response_mad - Returns if the specified MAD has been generated in
 *   response to a sent request or trap.
 */
int ib_response_mad(const struct ib_mad_hdr *hdr);

/**
 * ib_get_rmpp_resptime - Returns the RMPP response time.
 * @rmpp_hdr: An RMPP header.
 */
static inline u8 ib_get_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr)
{
        return rmpp_hdr->rmpp_rtime_flags >> 3;
}

/**
 * ib_get_rmpp_flags - Returns the RMPP flags.
 * @rmpp_hdr: An RMPP header.
 */
static inline u8 ib_get_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr)
{
        return rmpp_hdr->rmpp_rtime_flags & 0x7;
}

/**
 * ib_set_rmpp_resptime - Sets the response time in an RMPP header.
 * @rmpp_hdr: An RMPP header.
 * @rtime: The response time to set.
 */
static inline void ib_set_rmpp_resptime(struct ib_rmpp_hdr *rmpp_hdr, u8 rtime)
{
        rmpp_hdr->rmpp_rtime_flags = ib_get_rmpp_flags(rmpp_hdr) | (rtime << 3);
}

/**
 * ib_set_rmpp_flags - Sets the flags in an RMPP header.
 * @rmpp_hdr: An RMPP header.
 * @flags: The flags to set.
 */
static inline void ib_set_rmpp_flags(struct ib_rmpp_hdr *rmpp_hdr, u8 flags)
{
        rmpp_hdr->rmpp_rtime_flags = (rmpp_hdr->rmpp_rtime_flags & 0xF8) |
                                     (flags & 0x7);
}

struct ib_mad_agent;
struct ib_mad_send_wc;
struct ib_mad_recv_wc;

/**
 * ib_mad_send_handler - callback handler for a sent MAD.
 * @mad_agent: MAD agent that sent the MAD.
 * @mad_send_wc: Send work completion information on the sent MAD.
 */
typedef void (*ib_mad_send_handler)(struct ib_mad_agent *mad_agent,
                                    struct ib_mad_send_wc *mad_send_wc);

/**
 * ib_mad_snoop_handler - Callback handler for snooping sent MADs.
 * @mad_agent: MAD agent that snooped the MAD.
 * @send_buf: send MAD data buffer.
 * @mad_send_wc: Work completion information on the sent MAD.  Valid
 *   only for snooping that occurs on a send completion.
 *
 * Clients snooping MADs should not modify data referenced by the @send_buf
 * or @mad_send_wc.
 */
typedef void (*ib_mad_snoop_handler)(struct ib_mad_agent *mad_agent,
                                     struct ib_mad_send_buf *send_buf,
                                     struct ib_mad_send_wc *mad_send_wc);

/**
 * ib_mad_recv_handler - callback handler for a received MAD.
 * @mad_agent: MAD agent requesting the received MAD.
 * @send_buf: Send buffer if found, else NULL
 * @mad_recv_wc: Received work completion information on the received MAD.
 *
 * MADs received in response to a send request operation will be handed to
 * the user before the send operation completes.  All data buffers given
 * to registered agents through this routine are owned by the receiving
 * client, except for snooping agents.  Clients snooping MADs should not
 * modify the data referenced by @mad_recv_wc.
 */
typedef void (*ib_mad_recv_handler)(struct ib_mad_agent *mad_agent,
                                    struct ib_mad_send_buf *send_buf,
                                    struct ib_mad_recv_wc *mad_recv_wc);

/**
 * ib_mad_agent - Used to track MAD registration with the access layer.
 * @device: Reference to device registration is on.
 * @qp: Reference to QP used for sending and receiving MADs.
 * @mr: Memory region for system memory usable for DMA.
 * @recv_handler: Callback handler for a received MAD.
 * @send_handler: Callback handler for a sent MAD.
 * @snoop_handler: Callback handler for snooped sent MADs.
 * @context: User-specified context associated with this registration.
 * @hi_tid: Access layer assigned transaction ID for this client.
 *   Unsolicited MADs sent by this client will have the upper 32-bits
 *   of their TID set to this value.
 * @flags: registration flags
 * @port_num: Port number on which QP is registered
 * @rmpp_version: If set, indicates the RMPP version used by this agent.
 */
enum {
        IB_MAD_USER_RMPP = IB_USER_MAD_USER_RMPP,
};
struct ib_mad_agent {
        struct ib_device        *device;
        struct ib_qp            *qp;
        ib_mad_recv_handler     recv_handler;
        ib_mad_send_handler     send_handler;
        ib_mad_snoop_handler    snoop_handler;
        void                    *context;
        u32                     hi_tid;
        u32                     flags;
        void                    *security;
        struct list_head        mad_agent_sec_list;
        u8                      port_num;
        u8                      rmpp_version;
        bool                    smp_allowed;
};

/**
 * ib_mad_send_wc - MAD send completion information.
 * @send_buf: Send MAD data buffer associated with the send MAD request.
 * @status: Completion status.
 * @vendor_err: Optional vendor error information returned with a failed
 *   request.
 */
struct ib_mad_send_wc {
        struct ib_mad_send_buf  *send_buf;
        enum ib_wc_status       status;
        u32                     vendor_err;
};

/**
 * ib_mad_recv_buf - received MAD buffer information.
 * @list: Reference to next data buffer for a received RMPP MAD.
 * @grh: References a data buffer containing the global route header.
 *   The data refereced by this buffer is only valid if the GRH is
 *   valid.
 * @mad: References the start of the received MAD.
 */
struct ib_mad_recv_buf {
        struct list_head        list;
        struct ib_grh           *grh;
        union {
                struct ib_mad   *mad;
                struct opa_mad  *opa_mad;
        };
};

/**
 * ib_mad_recv_wc - received MAD information.
 * @wc: Completion information for the received data.
 * @recv_buf: Specifies the location of the received data buffer(s).
 * @rmpp_list: Specifies a list of RMPP reassembled received MAD buffers.
 * @mad_len: The length of the received MAD, without duplicated headers.
 * @mad_seg_size: The size of individual MAD segments
 *
 * For received response, the wr_id contains a pointer to the ib_mad_send_buf
 *   for the corresponding send request.
 */
struct ib_mad_recv_wc {
        struct ib_wc            *wc;
        struct ib_mad_recv_buf  recv_buf;
        struct list_head        rmpp_list;
        int                     mad_len;
        size_t                  mad_seg_size;
};

/**
 * ib_mad_reg_req - MAD registration request
 * @mgmt_class: Indicates which management class of MADs should be receive
 *   by the caller.  This field is only required if the user wishes to
 *   receive unsolicited MADs, otherwise it should be 0.
 * @mgmt_class_version: Indicates which version of MADs for the given
 *   management class to receive.
 * @oui: Indicates IEEE OUI when mgmt_class is a vendor class
 *   in the range from 0x30 to 0x4f. Otherwise not used.
 * @method_mask: The caller will receive unsolicited MADs for any method
 *   where @method_mask = 1.
 *
 */
struct ib_mad_reg_req {
        u8      mgmt_class;
        u8      mgmt_class_version;
        u8      oui[3];
        DECLARE_BITMAP(method_mask, IB_MGMT_MAX_METHODS);
};

/**
 * ib_register_mad_agent - Register to send/receive MADs.
 * @device: The device to register with.
 * @port_num: The port on the specified device to use.
 * @qp_type: Specifies which QP to access.  Must be either
 *   IB_QPT_SMI or IB_QPT_GSI.
 * @mad_reg_req: Specifies which unsolicited MADs should be received
 *   by the caller.  This parameter may be NULL if the caller only
 *   wishes to receive solicited responses.
 * @rmpp_version: If set, indicates that the client will send
 *   and receive MADs that contain the RMPP header for the given version.
 *   If set to 0, indicates that RMPP is not used by this client.
 * @send_handler: The completion callback routine invoked after a send
 *   request has completed.
 * @recv_handler: The completion callback routine invoked for a received
 *   MAD.
 * @context: User specified context associated with the registration.
 * @registration_flags: Registration flags to set for this agent
 */
struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
                                           u8 port_num,
                                           enum ib_qp_type qp_type,
                                           struct ib_mad_reg_req *mad_reg_req,
                                           u8 rmpp_version,
                                           ib_mad_send_handler send_handler,
                                           ib_mad_recv_handler recv_handler,
                                           void *context,
                                           u32 registration_flags);

enum ib_mad_snoop_flags {
        /*IB_MAD_SNOOP_POSTED_SENDS        = 1,*/
        /*IB_MAD_SNOOP_RMPP_SENDS          = (1<<1),*/
        IB_MAD_SNOOP_SEND_COMPLETIONS      = (1<<2),
        /*IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS = (1<<3),*/
        IB_MAD_SNOOP_RECVS                 = (1<<4)
        /*IB_MAD_SNOOP_RMPP_RECVS          = (1<<5),*/
        /*IB_MAD_SNOOP_REDIRECTED_QPS      = (1<<6)*/
};

/**
 * ib_register_mad_snoop - Register to snoop sent and received MADs.
 * @device: The device to register with.
 * @port_num: The port on the specified device to use.
 * @qp_type: Specifies which QP traffic to snoop.  Must be either
 *   IB_QPT_SMI or IB_QPT_GSI.
 * @mad_snoop_flags: Specifies information where snooping occurs.
 * @send_handler: The callback routine invoked for a snooped send.
 * @recv_handler: The callback routine invoked for a snooped receive.
 * @context: User specified context associated with the registration.
 */
struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
                                           u8 port_num,
                                           enum ib_qp_type qp_type,
                                           int mad_snoop_flags,
                                           ib_mad_snoop_handler snoop_handler,
                                           ib_mad_recv_handler recv_handler,
                                           void *context);

/**
 * ib_unregister_mad_agent - Unregisters a client from using MAD services.
 * @mad_agent: Corresponding MAD registration request to deregister.
 *
 * After invoking this routine, MAD services are no longer usable by the
 * client on the associated QP.
 */
void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent);

/**
 * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
 *   with the registered client.
 * @send_buf: Specifies the information needed to send the MAD(s).
 * @bad_send_buf: Specifies the MAD on which an error was encountered.  This
 *   parameter is optional if only a single MAD is posted.
 *
 * Sent MADs are not guaranteed to complete in the order that they were posted.
 *
 * If the MAD requires RMPP, the data buffer should contain a single copy
 * of the common MAD, RMPP, and class specific headers, followed by the class
 * defined data.  If the class defined data would not divide evenly into
 * RMPP segments, then space must be allocated at the end of the referenced
 * buffer for any required padding.  To indicate the amount of class defined
 * data being transferred, the paylen_newwin field in the RMPP header should
 * be set to the size of the class specific header plus the amount of class
 * defined data being transferred.  The paylen_newwin field should be
 * specified in network-byte order.
 */
int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
                     struct ib_mad_send_buf **bad_send_buf);


/**
 * ib_free_recv_mad - Returns data buffers used to receive a MAD.
 * @mad_recv_wc: Work completion information for a received MAD.
 *
 * Clients receiving MADs through their ib_mad_recv_handler must call this
 * routine to return the work completion buffers to the access layer.
 */
void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);

/**
 * ib_cancel_mad - Cancels an outstanding send MAD operation.
 * @mad_agent: Specifies the registration associated with sent MAD.
 * @send_buf: Indicates the MAD to cancel.
 *
 * MADs will be returned to the user through the corresponding
 * ib_mad_send_handler.
 */
void ib_cancel_mad(struct ib_mad_agent *mad_agent,
                   struct ib_mad_send_buf *send_buf);

/**
 * ib_modify_mad - Modifies an outstanding send MAD operation.
 * @mad_agent: Specifies the registration associated with sent MAD.
 * @send_buf: Indicates the MAD to modify.
 * @timeout_ms: New timeout value for sent MAD.
 *
 * This call will reset the timeout value for a sent MAD to the specified
 * value.
 */
int ib_modify_mad(struct ib_mad_agent *mad_agent,
                  struct ib_mad_send_buf *send_buf, u32 timeout_ms);

/**
 * ib_create_send_mad - Allocate and initialize a data buffer and work request
 *   for sending a MAD.
 * @mad_agent: Specifies the registered MAD service to associate with the MAD.
 * @remote_qpn: Specifies the QPN of the receiving node.
 * @pkey_index: Specifies which PKey the MAD will be sent using.  This field
 *   is valid only if the remote_qpn is QP 1.
 * @rmpp_active: Indicates if the send will enable RMPP.
 * @hdr_len: Indicates the size of the data header of the MAD.  This length
 *   should include the common MAD header, RMPP header, plus any class
 *   specific header.
 * @data_len: Indicates the size of any user-transferred data.  The call will
 *   automatically adjust the allocated buffer size to account for any
 *   additional padding that may be necessary.
 * @gfp_mask: GFP mask used for the memory allocation.
 * @base_version: Base Version of this MAD
 *
 * This routine allocates a MAD for sending.  The returned MAD send buffer
 * will reference a data buffer usable for sending a MAD, along
 * with an initialized work request structure.  Users may modify the returned
 * MAD data buffer before posting the send.
 *
 * The returned MAD header, class specific headers, and any padding will be
 * cleared.  Users are responsible for initializing the common MAD header,
 * any class specific header, and MAD data area.
 * If @rmpp_active is set, the RMPP header will be initialized for sending.
 */
struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
                                           u32 remote_qpn, u16 pkey_index,
                                           int rmpp_active,
                                           int hdr_len, int data_len,
                                           gfp_t gfp_mask,
                                           u8 base_version);

/**
 * ib_is_mad_class_rmpp - returns whether given management class
 * supports RMPP.
 * @mgmt_class: management class
 *
 * This routine returns whether the management class supports RMPP.
 */
int ib_is_mad_class_rmpp(u8 mgmt_class);

/**
 * ib_get_mad_data_offset - returns the data offset for a given
 * management class.
 * @mgmt_class: management class
 *
 * This routine returns the data offset in the MAD for the management
 * class requested.
 */
int ib_get_mad_data_offset(u8 mgmt_class);

/**
 * ib_get_rmpp_segment - returns the data buffer for a given RMPP segment.
 * @send_buf: Previously allocated send data buffer.
 * @seg_num: number of segment to return
 *
 * This routine returns a pointer to the data buffer of an RMPP MAD.
 * Users must provide synchronization to @send_buf around this call.
 */
void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num);

/**
 * ib_free_send_mad - Returns data buffers used to send a MAD.
 * @send_buf: Previously allocated send data buffer.
 */
void ib_free_send_mad(struct ib_mad_send_buf *send_buf);

/**
 * ib_mad_kernel_rmpp_agent - Returns if the agent is performing RMPP.
 * @agent: the agent in question
 * @return: true if agent is performing rmpp, false otherwise.
 */
int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent);

#endif /* IB_MAD_H */