/*
 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef RXE_HDR_H
#define RXE_HDR_H

/* extracted information about a packet carried in an sk_buff struct fits in
 * the skbuff cb array. Must be at most 48 bytes. stored in control block of
 * sk_buff for received packets.
 */
struct rxe_pkt_info {
        struct rxe_dev          *rxe;           /* device that owns packet */
        struct rxe_qp           *qp;            /* qp that owns packet */
        struct rxe_send_wqe     *wqe;           /* send wqe */
        u8                      *hdr;           /* points to bth */
        u32                     mask;           /* useful info about pkt */
        u32                     psn;            /* bth psn of packet */
        u16                     pkey_index;     /* partition of pkt */
        u16                     paylen;         /* length of bth - icrc */
        u8                      port_num;       /* port pkt received on */
        u8                      opcode;         /* bth opcode of packet */
        u8                      offset;         /* bth offset from pkt->hdr */
};

/* Macros should be used only for received skb */
static inline struct rxe_pkt_info *SKB_TO_PKT(struct sk_buff *skb)
{
        BUILD_BUG_ON(sizeof(struct rxe_pkt_info) > sizeof(skb->cb));
        return (void *)skb->cb;
}

static inline struct sk_buff *PKT_TO_SKB(struct rxe_pkt_info *pkt)
{
        return container_of((void *)pkt, struct sk_buff, cb);
}

/*
 * IBA header types and methods
 *
 * Some of these are for reference and completeness only since
 * rxe does not currently support RD transport
 * most of this could be moved into IB core. ib_pack.h has
 * part of this but is incomplete
 *
 * Header specific routines to insert/extract values to/from headers
 * the routines that are named __hhh_(set_)fff() take a pointer to a
 * hhh header and get(set) the fff field. The routines named
 * hhh_(set_)fff take a packet info struct and find the
 * header and field based on the opcode in the packet.
 * Conversion to/from network byte order from cpu order is also done.
 */

#define RXE_ICRC_SIZE           (4)
#define RXE_MAX_HDR_LENGTH      (80)

/******************************************************************************
 * Base Transport Header
 ******************************************************************************/
struct rxe_bth {
        u8                      opcode;
        u8                      flags;
        __be16                  pkey;
        __be32                  qpn;
        __be32                  apsn;
};

#define BTH_TVER                (0)
#define BTH_DEF_PKEY            (0xffff)

#define BTH_SE_MASK             (0x80)
#define BTH_MIG_MASK            (0x40)
#define BTH_PAD_MASK            (0x30)
#define BTH_TVER_MASK           (0x0f)
#define BTH_FECN_MASK           (0x80000000)
#define BTH_BECN_MASK           (0x40000000)
#define BTH_RESV6A_MASK         (0x3f000000)
#define BTH_QPN_MASK            (0x00ffffff)
#define BTH_ACK_MASK            (0x80000000)
#define BTH_RESV7_MASK          (0x7f000000)
#define BTH_PSN_MASK            (0x00ffffff)

static inline u8 __bth_opcode(void *arg)
{
        struct rxe_bth *bth = arg;

        return bth->opcode;
}

static inline void __bth_set_opcode(void *arg, u8 opcode)
{
        struct rxe_bth *bth = arg;

        bth->opcode = opcode;
}

static inline u8 __bth_se(void *arg)
{
        struct rxe_bth *bth = arg;

        return 0 != (BTH_SE_MASK & bth->flags);
}

static inline void __bth_set_se(void *arg, int se)
{
        struct rxe_bth *bth = arg;

        if (se)
                bth->flags |= BTH_SE_MASK;
        else
                bth->flags &= ~BTH_SE_MASK;
}

static inline u8 __bth_mig(void *arg)
{
        struct rxe_bth *bth = arg;

        return 0 != (BTH_MIG_MASK & bth->flags);
}

static inline void __bth_set_mig(void *arg, u8 mig)
{
        struct rxe_bth *bth = arg;

        if (mig)
                bth->flags |= BTH_MIG_MASK;
        else
                bth->flags &= ~BTH_MIG_MASK;
}

static inline u8 __bth_pad(void *arg)
{
        struct rxe_bth *bth = arg;

        return (BTH_PAD_MASK & bth->flags) >> 4;
}

static inline void __bth_set_pad(void *arg, u8 pad)
{
        struct rxe_bth *bth = arg;

        bth->flags = (BTH_PAD_MASK & (pad << 4)) |
                        (~BTH_PAD_MASK & bth->flags);
}

static inline u8 __bth_tver(void *arg)
{
        struct rxe_bth *bth = arg;

        return BTH_TVER_MASK & bth->flags;
}

static inline void __bth_set_tver(void *arg, u8 tver)
{
        struct rxe_bth *bth = arg;

        bth->flags = (BTH_TVER_MASK & tver) |
                        (~BTH_TVER_MASK & bth->flags);
}

static inline u16 __bth_pkey(void *arg)
{
        struct rxe_bth *bth = arg;

        return be16_to_cpu(bth->pkey);
}

static inline void __bth_set_pkey(void *arg, u16 pkey)
{
        struct rxe_bth *bth = arg;

        bth->pkey = cpu_to_be16(pkey);
}

static inline u32 __bth_qpn(void *arg)
{
        struct rxe_bth *bth = arg;

        return BTH_QPN_MASK & be32_to_cpu(bth->qpn);
}

static inline void __bth_set_qpn(void *arg, u32 qpn)
{
        struct rxe_bth *bth = arg;
        u32 resvqpn = be32_to_cpu(bth->qpn);

        bth->qpn = cpu_to_be32((BTH_QPN_MASK & qpn) |
                               (~BTH_QPN_MASK & resvqpn));
}

static inline int __bth_fecn(void *arg)
{
        struct rxe_bth *bth = arg;

        return 0 != (cpu_to_be32(BTH_FECN_MASK) & bth->qpn);
}

static inline void __bth_set_fecn(void *arg, int fecn)
{
        struct rxe_bth *bth = arg;

        if (fecn)
                bth->qpn |= cpu_to_be32(BTH_FECN_MASK);
        else
                bth->qpn &= ~cpu_to_be32(BTH_FECN_MASK);
}

static inline int __bth_becn(void *arg)
{
        struct rxe_bth *bth = arg;

        return 0 != (cpu_to_be32(BTH_BECN_MASK) & bth->qpn);
}

static inline void __bth_set_becn(void *arg, int becn)
{
        struct rxe_bth *bth = arg;

        if (becn)
                bth->qpn |= cpu_to_be32(BTH_BECN_MASK);
        else
                bth->qpn &= ~cpu_to_be32(BTH_BECN_MASK);
}

static inline u8 __bth_resv6a(void *arg)
{
        struct rxe_bth *bth = arg;

        return (BTH_RESV6A_MASK & be32_to_cpu(bth->qpn)) >> 24;
}

static inline void __bth_set_resv6a(void *arg)
{
        struct rxe_bth *bth = arg;

        bth->qpn = cpu_to_be32(~BTH_RESV6A_MASK);
}

static inline int __bth_ack(void *arg)
{
        struct rxe_bth *bth = arg;

        return 0 != (cpu_to_be32(BTH_ACK_MASK) & bth->apsn);
}

static inline void __bth_set_ack(void *arg, int ack)
{
        struct rxe_bth *bth = arg;

        if (ack)
                bth->apsn |= cpu_to_be32(BTH_ACK_MASK);
        else
                bth->apsn &= ~cpu_to_be32(BTH_ACK_MASK);
}

static inline void __bth_set_resv7(void *arg)
{
        struct rxe_bth *bth = arg;

        bth->apsn &= ~cpu_to_be32(BTH_RESV7_MASK);
}

static inline u32 __bth_psn(void *arg)
{
        struct rxe_bth *bth = arg;

        return BTH_PSN_MASK & be32_to_cpu(bth->apsn);
}

static inline void __bth_set_psn(void *arg, u32 psn)
{
        struct rxe_bth *bth = arg;
        u32 apsn = be32_to_cpu(bth->apsn);

        bth->apsn = cpu_to_be32((BTH_PSN_MASK & psn) |
                        (~BTH_PSN_MASK & apsn));
}

static inline u8 bth_opcode(struct rxe_pkt_info *pkt)
{
        return __bth_opcode(pkt->hdr + pkt->offset);
}

static inline void bth_set_opcode(struct rxe_pkt_info *pkt, u8 opcode)
{
        __bth_set_opcode(pkt->hdr + pkt->offset, opcode);
}

static inline u8 bth_se(struct rxe_pkt_info *pkt)
{
        return __bth_se(pkt->hdr + pkt->offset);
}

static inline void bth_set_se(struct rxe_pkt_info *pkt, int se)
{
        __bth_set_se(pkt->hdr + pkt->offset, se);
}

static inline u8 bth_mig(struct rxe_pkt_info *pkt)
{
        return __bth_mig(pkt->hdr + pkt->offset);
}

static inline void bth_set_mig(struct rxe_pkt_info *pkt, u8 mig)
{
        __bth_set_mig(pkt->hdr + pkt->offset, mig);
}

static inline u8 bth_pad(struct rxe_pkt_info *pkt)
{
        return __bth_pad(pkt->hdr + pkt->offset);
}

static inline void bth_set_pad(struct rxe_pkt_info *pkt, u8 pad)
{
        __bth_set_pad(pkt->hdr + pkt->offset, pad);
}

static inline u8 bth_tver(struct rxe_pkt_info *pkt)
{
        return __bth_tver(pkt->hdr + pkt->offset);
}

static inline void bth_set_tver(struct rxe_pkt_info *pkt, u8 tver)
{
        __bth_set_tver(pkt->hdr + pkt->offset, tver);
}

static inline u16 bth_pkey(struct rxe_pkt_info *pkt)
{
        return __bth_pkey(pkt->hdr + pkt->offset);
}

static inline void bth_set_pkey(struct rxe_pkt_info *pkt, u16 pkey)
{
        __bth_set_pkey(pkt->hdr + pkt->offset, pkey);
}

static inline u32 bth_qpn(struct rxe_pkt_info *pkt)
{
        return __bth_qpn(pkt->hdr + pkt->offset);
}

static inline void bth_set_qpn(struct rxe_pkt_info *pkt, u32 qpn)
{
        __bth_set_qpn(pkt->hdr + pkt->offset, qpn);
}

static inline int bth_fecn(struct rxe_pkt_info *pkt)
{
        return __bth_fecn(pkt->hdr + pkt->offset);
}

static inline void bth_set_fecn(struct rxe_pkt_info *pkt, int fecn)
{
        __bth_set_fecn(pkt->hdr + pkt->offset, fecn);
}

static inline int bth_becn(struct rxe_pkt_info *pkt)
{
        return __bth_becn(pkt->hdr + pkt->offset);
}

static inline void bth_set_becn(struct rxe_pkt_info *pkt, int becn)
{
        __bth_set_becn(pkt->hdr + pkt->offset, becn);
}

static inline u8 bth_resv6a(struct rxe_pkt_info *pkt)
{
        return __bth_resv6a(pkt->hdr + pkt->offset);
}

static inline void bth_set_resv6a(struct rxe_pkt_info *pkt)
{
        __bth_set_resv6a(pkt->hdr + pkt->offset);
}

static inline int bth_ack(struct rxe_pkt_info *pkt)
{
        return __bth_ack(pkt->hdr + pkt->offset);
}

static inline void bth_set_ack(struct rxe_pkt_info *pkt, int ack)
{
        __bth_set_ack(pkt->hdr + pkt->offset, ack);
}

static inline void bth_set_resv7(struct rxe_pkt_info *pkt)
{
        __bth_set_resv7(pkt->hdr + pkt->offset);
}

static inline u32 bth_psn(struct rxe_pkt_info *pkt)
{
        return __bth_psn(pkt->hdr + pkt->offset);
}

static inline void bth_set_psn(struct rxe_pkt_info *pkt, u32 psn)
{
        __bth_set_psn(pkt->hdr + pkt->offset, psn);
}

static inline void bth_init(struct rxe_pkt_info *pkt, u8 opcode, int se,
                            int mig, int pad, u16 pkey, u32 qpn, int ack_req,
                            u32 psn)
{
        struct rxe_bth *bth = (struct rxe_bth *)(pkt->hdr + pkt->offset);

        bth->opcode = opcode;
        bth->flags = (pad << 4) & BTH_PAD_MASK;
        if (se)
                bth->flags |= BTH_SE_MASK;
        if (mig)
                bth->flags |= BTH_MIG_MASK;
        bth->pkey = cpu_to_be16(pkey);
        bth->qpn = cpu_to_be32(qpn & BTH_QPN_MASK);
        psn &= BTH_PSN_MASK;
        if (ack_req)
                psn |= BTH_ACK_MASK;
        bth->apsn = cpu_to_be32(psn);
}

/******************************************************************************
 * Reliable Datagram Extended Transport Header
 ******************************************************************************/
struct rxe_rdeth {
        __be32                  een;
};

#define RDETH_EEN_MASK          (0x00ffffff)

static inline u8 __rdeth_een(void *arg)
{
        struct rxe_rdeth *rdeth = arg;

        return RDETH_EEN_MASK & be32_to_cpu(rdeth->een);
}

static inline void __rdeth_set_een(void *arg, u32 een)
{
        struct rxe_rdeth *rdeth = arg;

        rdeth->een = cpu_to_be32(RDETH_EEN_MASK & een);
}

static inline u8 rdeth_een(struct rxe_pkt_info *pkt)
{
        return __rdeth_een(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RDETH]);
}

static inline void rdeth_set_een(struct rxe_pkt_info *pkt, u32 een)
{
        __rdeth_set_een(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RDETH], een);
}

/******************************************************************************
 * Datagram Extended Transport Header
 ******************************************************************************/
struct rxe_deth {
        __be32                  qkey;
        __be32                  sqp;
};

#define GSI_QKEY                (0x80010000)
#define DETH_SQP_MASK           (0x00ffffff)

static inline u32 __deth_qkey(void *arg)
{
        struct rxe_deth *deth = arg;

        return be32_to_cpu(deth->qkey);
}

static inline void __deth_set_qkey(void *arg, u32 qkey)
{
        struct rxe_deth *deth = arg;

        deth->qkey = cpu_to_be32(qkey);
}

static inline u32 __deth_sqp(void *arg)
{
        struct rxe_deth *deth = arg;

        return DETH_SQP_MASK & be32_to_cpu(deth->sqp);
}

static inline void __deth_set_sqp(void *arg, u32 sqp)
{
        struct rxe_deth *deth = arg;

        deth->sqp = cpu_to_be32(DETH_SQP_MASK & sqp);
}

static inline u32 deth_qkey(struct rxe_pkt_info *pkt)
{
        return __deth_qkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_DETH]);
}

static inline void deth_set_qkey(struct rxe_pkt_info *pkt, u32 qkey)
{
        __deth_set_qkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_DETH], qkey);
}

static inline u32 deth_sqp(struct rxe_pkt_info *pkt)
{
        return __deth_sqp(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_DETH]);
}

static inline void deth_set_sqp(struct rxe_pkt_info *pkt, u32 sqp)
{
        __deth_set_sqp(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_DETH], sqp);
}

/******************************************************************************
 * RDMA Extended Transport Header
 ******************************************************************************/
struct rxe_reth {
        __be64                  va;
        __be32                  rkey;
        __be32                  len;
};

static inline u64 __reth_va(void *arg)
{
        struct rxe_reth *reth = arg;

        return be64_to_cpu(reth->va);
}

static inline void __reth_set_va(void *arg, u64 va)
{
        struct rxe_reth *reth = arg;

        reth->va = cpu_to_be64(va);
}

static inline u32 __reth_rkey(void *arg)
{
        struct rxe_reth *reth = arg;

        return be32_to_cpu(reth->rkey);
}

static inline void __reth_set_rkey(void *arg, u32 rkey)
{
        struct rxe_reth *reth = arg;

        reth->rkey = cpu_to_be32(rkey);
}

static inline u32 __reth_len(void *arg)
{
        struct rxe_reth *reth = arg;

        return be32_to_cpu(reth->len);
}

static inline void __reth_set_len(void *arg, u32 len)
{
        struct rxe_reth *reth = arg;

        reth->len = cpu_to_be32(len);
}

static inline u64 reth_va(struct rxe_pkt_info *pkt)
{
        return __reth_va(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RETH]);
}

static inline void reth_set_va(struct rxe_pkt_info *pkt, u64 va)
{
        __reth_set_va(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RETH], va);
}

static inline u32 reth_rkey(struct rxe_pkt_info *pkt)
{
        return __reth_rkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RETH]);
}

static inline void reth_set_rkey(struct rxe_pkt_info *pkt, u32 rkey)
{
        __reth_set_rkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RETH], rkey);
}

static inline u32 reth_len(struct rxe_pkt_info *pkt)
{
        return __reth_len(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RETH]);
}

static inline void reth_set_len(struct rxe_pkt_info *pkt, u32 len)
{
        __reth_set_len(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_RETH], len);
}

/******************************************************************************
 * Atomic Extended Transport Header
 ******************************************************************************/
struct rxe_atmeth {
        __be64                  va;
        __be32                  rkey;
        __be64                  swap_add;
        __be64                  comp;
} __packed;

static inline u64 __atmeth_va(void *arg)
{
        struct rxe_atmeth *atmeth = arg;

        return be64_to_cpu(atmeth->va);
}

static inline void __atmeth_set_va(void *arg, u64 va)
{
        struct rxe_atmeth *atmeth = arg;

        atmeth->va = cpu_to_be64(va);
}

static inline u32 __atmeth_rkey(void *arg)
{
        struct rxe_atmeth *atmeth = arg;

        return be32_to_cpu(atmeth->rkey);
}

static inline void __atmeth_set_rkey(void *arg, u32 rkey)
{
        struct rxe_atmeth *atmeth = arg;

        atmeth->rkey = cpu_to_be32(rkey);
}

static inline u64 __atmeth_swap_add(void *arg)
{
        struct rxe_atmeth *atmeth = arg;

        return be64_to_cpu(atmeth->swap_add);
}

static inline void __atmeth_set_swap_add(void *arg, u64 swap_add)
{
        struct rxe_atmeth *atmeth = arg;

        atmeth->swap_add = cpu_to_be64(swap_add);
}

static inline u64 __atmeth_comp(void *arg)
{
        struct rxe_atmeth *atmeth = arg;

        return be64_to_cpu(atmeth->comp);
}

static inline void __atmeth_set_comp(void *arg, u64 comp)
{
        struct rxe_atmeth *atmeth = arg;

        atmeth->comp = cpu_to_be64(comp);
}

static inline u64 atmeth_va(struct rxe_pkt_info *pkt)
{
        return __atmeth_va(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH]);
}

static inline void atmeth_set_va(struct rxe_pkt_info *pkt, u64 va)
{
        __atmeth_set_va(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH], va);
}

static inline u32 atmeth_rkey(struct rxe_pkt_info *pkt)
{
        return __atmeth_rkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH]);
}

static inline void atmeth_set_rkey(struct rxe_pkt_info *pkt, u32 rkey)
{
        __atmeth_set_rkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH], rkey);
}

static inline u64 atmeth_swap_add(struct rxe_pkt_info *pkt)
{
        return __atmeth_swap_add(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH]);
}

static inline void atmeth_set_swap_add(struct rxe_pkt_info *pkt, u64 swap_add)
{
        __atmeth_set_swap_add(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH], swap_add);
}

static inline u64 atmeth_comp(struct rxe_pkt_info *pkt)
{
        return __atmeth_comp(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH]);
}

static inline void atmeth_set_comp(struct rxe_pkt_info *pkt, u64 comp)
{
        __atmeth_set_comp(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMETH], comp);
}

/******************************************************************************
 * Ack Extended Transport Header
 ******************************************************************************/
struct rxe_aeth {
        __be32                  smsn;
};

#define AETH_SYN_MASK           (0xff000000)
#define AETH_MSN_MASK           (0x00ffffff)

enum aeth_syndrome {
        AETH_TYPE_MASK          = 0xe0,
        AETH_ACK                = 0x00,
        AETH_RNR_NAK            = 0x20,
        AETH_RSVD               = 0x40,
        AETH_NAK                = 0x60,
        AETH_ACK_UNLIMITED      = 0x1f,
        AETH_NAK_PSN_SEQ_ERROR  = 0x60,
        AETH_NAK_INVALID_REQ    = 0x61,
        AETH_NAK_REM_ACC_ERR    = 0x62,
        AETH_NAK_REM_OP_ERR     = 0x63,
        AETH_NAK_INV_RD_REQ     = 0x64,
};

static inline u8 __aeth_syn(void *arg)
{
        struct rxe_aeth *aeth = arg;

        return (AETH_SYN_MASK & be32_to_cpu(aeth->smsn)) >> 24;
}

static inline void __aeth_set_syn(void *arg, u8 syn)
{
        struct rxe_aeth *aeth = arg;
        u32 smsn = be32_to_cpu(aeth->smsn);

        aeth->smsn = cpu_to_be32((AETH_SYN_MASK & (syn << 24)) |
                         (~AETH_SYN_MASK & smsn));
}

static inline u32 __aeth_msn(void *arg)
{
        struct rxe_aeth *aeth = arg;

        return AETH_MSN_MASK & be32_to_cpu(aeth->smsn);
}

static inline void __aeth_set_msn(void *arg, u32 msn)
{
        struct rxe_aeth *aeth = arg;
        u32 smsn = be32_to_cpu(aeth->smsn);

        aeth->smsn = cpu_to_be32((AETH_MSN_MASK & msn) |
                         (~AETH_MSN_MASK & smsn));
}

static inline u8 aeth_syn(struct rxe_pkt_info *pkt)
{
        return __aeth_syn(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_AETH]);
}

static inline void aeth_set_syn(struct rxe_pkt_info *pkt, u8 syn)
{
        __aeth_set_syn(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_AETH], syn);
}

static inline u32 aeth_msn(struct rxe_pkt_info *pkt)
{
        return __aeth_msn(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_AETH]);
}

static inline void aeth_set_msn(struct rxe_pkt_info *pkt, u32 msn)
{
        __aeth_set_msn(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_AETH], msn);
}

/******************************************************************************
 * Atomic Ack Extended Transport Header
 ******************************************************************************/
struct rxe_atmack {
        __be64                  orig;
};

static inline u64 __atmack_orig(void *arg)
{
        struct rxe_atmack *atmack = arg;

        return be64_to_cpu(atmack->orig);
}

static inline void __atmack_set_orig(void *arg, u64 orig)
{
        struct rxe_atmack *atmack = arg;

        atmack->orig = cpu_to_be64(orig);
}

static inline u64 atmack_orig(struct rxe_pkt_info *pkt)
{
        return __atmack_orig(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMACK]);
}

static inline void atmack_set_orig(struct rxe_pkt_info *pkt, u64 orig)
{
        __atmack_set_orig(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_ATMACK], orig);
}

/******************************************************************************
 * Immediate Extended Transport Header
 ******************************************************************************/
struct rxe_immdt {
        __be32                  imm;
};

static inline __be32 __immdt_imm(void *arg)
{
        struct rxe_immdt *immdt = arg;

        return immdt->imm;
}

static inline void __immdt_set_imm(void *arg, __be32 imm)
{
        struct rxe_immdt *immdt = arg;

        immdt->imm = imm;
}

static inline __be32 immdt_imm(struct rxe_pkt_info *pkt)
{
        return __immdt_imm(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_IMMDT]);
}

static inline void immdt_set_imm(struct rxe_pkt_info *pkt, __be32 imm)
{
        __immdt_set_imm(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_IMMDT], imm);
}

/******************************************************************************
 * Invalidate Extended Transport Header
 ******************************************************************************/
struct rxe_ieth {
        __be32                  rkey;
};

static inline u32 __ieth_rkey(void *arg)
{
        struct rxe_ieth *ieth = arg;

        return be32_to_cpu(ieth->rkey);
}

static inline void __ieth_set_rkey(void *arg, u32 rkey)
{
        struct rxe_ieth *ieth = arg;

        ieth->rkey = cpu_to_be32(rkey);
}

static inline u32 ieth_rkey(struct rxe_pkt_info *pkt)
{
        return __ieth_rkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_IETH]);
}

static inline void ieth_set_rkey(struct rxe_pkt_info *pkt, u32 rkey)
{
        __ieth_set_rkey(pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_IETH], rkey);
}

enum rxe_hdr_length {
        RXE_BTH_BYTES           = sizeof(struct rxe_bth),
        RXE_DETH_BYTES          = sizeof(struct rxe_deth),
        RXE_IMMDT_BYTES         = sizeof(struct rxe_immdt),
        RXE_RETH_BYTES          = sizeof(struct rxe_reth),
        RXE_AETH_BYTES          = sizeof(struct rxe_aeth),
        RXE_ATMACK_BYTES        = sizeof(struct rxe_atmack),
        RXE_ATMETH_BYTES        = sizeof(struct rxe_atmeth),
        RXE_IETH_BYTES          = sizeof(struct rxe_ieth),
        RXE_RDETH_BYTES         = sizeof(struct rxe_rdeth),
};

static inline size_t header_size(struct rxe_pkt_info *pkt)
{
        return pkt->offset + rxe_opcode[pkt->opcode].length;
}

static inline void *payload_addr(struct rxe_pkt_info *pkt)
{
        return pkt->hdr + pkt->offset
                + rxe_opcode[pkt->opcode].offset[RXE_PAYLOAD];
}

static inline size_t payload_size(struct rxe_pkt_info *pkt)
{
        return pkt->paylen - rxe_opcode[pkt->opcode].offset[RXE_PAYLOAD]
                - bth_pad(pkt) - RXE_ICRC_SIZE;
}

#endif /* RXE_HDR_H */