/* $Id: $ */

/*
 * Copyright (c) 2008 Daniel Mueller (daniel@danm.de)
 * Copyright (c) 2000 Theo de Raadt
 * Copyright (c) 2001 Patrik Lindergren (patrik@ipunplugged.com)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Effort sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
 *
 */

/* Maximum queue length */
#ifndef UBS_MAX_NQUEUE
#define UBS_MAX_NQUEUE      60
#endif

#define UBS_MAX_SCATTER     64  /* Maximum scatter/gather depth */

#ifndef UBS_MAX_AGGR
#define UBS_MAX_AGGR        5   /* Maximum aggregation count */
#endif

#define UBSEC_CARD(sid)     (((sid) & 0xf0000000) >> 28)
#define UBSEC_SESSION(sid)  ( (sid) & 0x0fffffff)
#define UBSEC_SID(crd, sesn)    (((crd) << 28) | ((sesn) & 0x0fffffff))

#define UBS_DEF_RTY     0xff    /* PCI Retry Timeout */
#define UBS_DEF_TOUT        0xff    /* PCI TRDY Timeout */
#define UBS_DEF_CACHELINE   0x01    /* Cache Line setting */

#define DEFAULT_HMAC_LEN     12

struct ubsec_dma_alloc {
    dma_addr_t      dma_paddr;
    void            *dma_vaddr;
    /*
    bus_dmamap_t            dma_map;
    bus_dma_segment_t       dma_seg;
    */
    size_t          dma_size;
    /*
    int             dma_nseg;
    */
};

struct ubsec_q2 {
    BSD_SIMPLEQ_ENTRY(ubsec_q2)     q_next;
    struct ubsec_dma_alloc      q_mcr;
    struct ubsec_dma_alloc      q_ctx;
    u_int               q_type;
};

struct ubsec_q2_rng {
    struct ubsec_q2         rng_q;
    struct ubsec_dma_alloc      rng_buf;
    int             rng_used;
};

/* C = (M ^ E) mod N */
#define UBS_MODEXP_PAR_M    0
#define UBS_MODEXP_PAR_E    1
#define UBS_MODEXP_PAR_N    2
struct ubsec_q2_modexp {
    struct ubsec_q2         me_q;
    struct cryptkop *       me_krp;
    struct ubsec_dma_alloc      me_M;
    struct ubsec_dma_alloc      me_E;
    struct ubsec_dma_alloc      me_C;
    struct ubsec_dma_alloc      me_epb;
    int             me_modbits;
    int             me_shiftbits;
    int             me_normbits;
};

#define UBS_RSAPRIV_PAR_P   0
#define UBS_RSAPRIV_PAR_Q   1
#define UBS_RSAPRIV_PAR_DP  2
#define UBS_RSAPRIV_PAR_DQ  3
#define UBS_RSAPRIV_PAR_PINV    4
#define UBS_RSAPRIV_PAR_MSGIN   5
#define UBS_RSAPRIV_PAR_MSGOUT  6
struct ubsec_q2_rsapriv {
    struct ubsec_q2         rpr_q;
    struct cryptkop *       rpr_krp;
    struct ubsec_dma_alloc      rpr_msgin;
    struct ubsec_dma_alloc      rpr_msgout;
};

#define UBSEC_RNG_BUFSIZ    16      /* measured in 32bit words */

struct ubsec_dmachunk {
    struct ubsec_mcr    d_mcr;
    struct ubsec_mcr_add    d_mcradd[UBS_MAX_AGGR-1];
    struct ubsec_pktbuf d_sbuf[UBS_MAX_SCATTER-1];
    struct ubsec_pktbuf d_dbuf[UBS_MAX_SCATTER-1];
    u_int32_t       d_macbuf[5];
    union {
        struct ubsec_pktctx_aes256 ctxaes256;
        struct ubsec_pktctx_aes192 ctxaes192;
        struct ubsec_pktctx_des ctxdes;
        struct ubsec_pktctx_aes128 ctxaes128;
        struct ubsec_pktctx     ctx;
    } d_ctx;
};

struct ubsec_dma {
    BSD_SIMPLEQ_ENTRY(ubsec_dma)    d_next;
    struct ubsec_dmachunk       *d_dma;
    struct ubsec_dma_alloc      d_alloc;
};

#define UBS_FLAGS_KEY       0x01        /* has key accelerator */
#define UBS_FLAGS_LONGCTX   0x02        /* uses long ipsec ctx */
#define UBS_FLAGS_BIGKEY    0x04        /* 2048bit keys */
#define UBS_FLAGS_HWNORM    0x08        /* hardware normalization */
#define UBS_FLAGS_RNG       0x10        /* hardware rng */
#define UBS_FLAGS_AES       0x20        /* hardware AES support */

struct ubsec_q {
    BSD_SIMPLEQ_ENTRY(ubsec_q)      q_next;
    int             q_nstacked_mcrs;
    struct ubsec_q          *q_stacked_mcr[UBS_MAX_AGGR-1];
    struct cryptop          *q_crp;
    struct ubsec_dma        *q_dma;

    //struct mbuf           *q_src_m, *q_dst_m;
    struct sk_buff      *q_src_m, *q_dst_m;
    struct uio          *q_src_io, *q_dst_io;

    /*
    bus_dmamap_t            q_src_map;
    bus_dmamap_t            q_dst_map;
    */

    /* DMA addresses for In-/Out packages */
    int q_src_len;
    int q_dst_len;
    struct ubsec_dma_alloc  q_src_map[UBS_MAX_SCATTER];
    struct ubsec_dma_alloc  q_dst_map[UBS_MAX_SCATTER];
    int q_has_dst;

    int             q_sesn;
    int             q_flags;
};

struct ubsec_softc {
    softc_device_decl   sc_dev;
    struct ssb_device   *sdev;      /* device backpointer */

    struct device       *sc_dv;     /* generic device */
    void                *sc_ih;     /* interrupt handler cookie */
    int                 sc_flags;   /* device specific flags */
    u_int32_t           sc_statmask;    /* interrupt status mask */
    int32_t             sc_cid;     /* crypto tag */
    BSD_SIMPLEQ_HEAD(,ubsec_q)  sc_queue;   /* packet queue, mcr1 */
    int                 sc_nqueue;  /* count enqueued, mcr1 */
    BSD_SIMPLEQ_HEAD(,ubsec_q)  sc_qchip;   /* on chip, mcr1 */
    BSD_SIMPLEQ_HEAD(,ubsec_q)  sc_freequeue;   /* list of free queue elements */
    BSD_SIMPLEQ_HEAD(,ubsec_q2) sc_queue2;  /* packet queue, mcr2 */
    int                 sc_nqueue2; /* count enqueued, mcr2 */
    BSD_SIMPLEQ_HEAD(,ubsec_q2) sc_qchip2;  /* on chip, mcr2 */
    int                 sc_nsessions;   /* # of sessions */
    struct ubsec_session        *sc_sessions;   /* sessions */
    int                 sc_rnghz;   /* rng poll time */
    struct ubsec_q2_rng sc_rng;
    struct ubsec_dma    sc_dmaa[UBS_MAX_NQUEUE];
    struct ubsec_q      *sc_queuea[UBS_MAX_NQUEUE];
    BSD_SIMPLEQ_HEAD(,ubsec_q2) sc_q2free;  /* free list */
    spinlock_t          sc_ringmtx; /* PE ring lock */
};

#define UBSEC_QFLAGS_COPYOUTIV      0x1

struct ubsec_session {
    u_int32_t   ses_used;
    u_int32_t   ses_key[8];         /* 3DES/AES key */
    u_int32_t   ses_hminner[5];     /* hmac inner state */
    u_int32_t   ses_hmouter[5];     /* hmac outer state */
    u_int32_t   ses_iv[4];          /* [3]DES/AES iv */
    u_int32_t   ses_keysize;        /* AES key size */
    u_int32_t   ses_mlen;           /* hmac/hash length */
};

struct ubsec_stats {
    u_int64_t hst_ibytes;
    u_int64_t hst_obytes;
    u_int32_t hst_ipackets;
    u_int32_t hst_opackets;
    u_int32_t hst_invalid;
    u_int32_t hst_nomem;
    u_int32_t hst_queuefull;
    u_int32_t hst_dmaerr;
    u_int32_t hst_mcrerr;
    u_int32_t hst_nodmafree;
};

struct ubsec_generic_ctx {
    u_int32_t   pc_key[8];      /* [3]DES/AES key */
    u_int32_t   pc_hminner[5];  /* hmac inner state */
    u_int32_t   pc_hmouter[5];  /* hmac outer state */
    u_int32_t   pc_iv[4];       /* [3]DES/AES iv */
    u_int16_t   pc_flags;       /* flags, below */
    u_int16_t   pc_offset;      /* crypto offset */
    u_int16_t   pc_type;        /* Cryptographic operation */
};