/*
 * Copyright (c) 2012, 2013 Intel Corporation.  All rights reserved.
 * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, 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 QIB_VERBS_H
#define QIB_VERBS_H

#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/kref.h>
#include <linux/workqueue.h>
#include <linux/kthread.h>
#include <linux/completion.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/rdma_vt.h>
#include <rdma/rdmavt_cq.h>

struct qib_ctxtdata;
struct qib_pportdata;
struct qib_devdata;
struct qib_verbs_txreq;

#define QIB_MAX_RDMA_ATOMIC     16
#define QIB_GUIDS_PER_PORT      5
#define QIB_PSN_SHIFT           8

/*
 * Increment this value if any changes that break userspace ABI
 * compatibility are made.
 */
#define QIB_UVERBS_ABI_VERSION       2

#define IB_SEQ_NAK      (3 << 29)

/* AETH NAK opcode values */
#define IB_RNR_NAK                      0x20
#define IB_NAK_PSN_ERROR                0x60
#define IB_NAK_INVALID_REQUEST          0x61
#define IB_NAK_REMOTE_ACCESS_ERROR      0x62
#define IB_NAK_REMOTE_OPERATIONAL_ERROR 0x63
#define IB_NAK_INVALID_RD_REQUEST       0x64

/* IB Performance Manager status values */
#define IB_PMA_SAMPLE_STATUS_DONE       0x00
#define IB_PMA_SAMPLE_STATUS_STARTED    0x01
#define IB_PMA_SAMPLE_STATUS_RUNNING    0x02

/* Mandatory IB performance counter select values. */
#define IB_PMA_PORT_XMIT_DATA   cpu_to_be16(0x0001)
#define IB_PMA_PORT_RCV_DATA    cpu_to_be16(0x0002)
#define IB_PMA_PORT_XMIT_PKTS   cpu_to_be16(0x0003)
#define IB_PMA_PORT_RCV_PKTS    cpu_to_be16(0x0004)
#define IB_PMA_PORT_XMIT_WAIT   cpu_to_be16(0x0005)

#define QIB_VENDOR_IPG          cpu_to_be16(0xFFA0)

#define IB_BTH_REQ_ACK          (1 << 31)
#define IB_BTH_SOLICITED        (1 << 23)
#define IB_BTH_MIG_REQ          (1 << 22)

/* XXX Should be defined in ib_verbs.h enum ib_port_cap_flags */
#define IB_PORT_OTHER_LOCAL_CHANGES_SUP (1 << 26)

#define IB_GRH_VERSION          6
#define IB_GRH_VERSION_MASK     0xF
#define IB_GRH_VERSION_SHIFT    28
#define IB_GRH_TCLASS_MASK      0xFF
#define IB_GRH_TCLASS_SHIFT     20
#define IB_GRH_FLOW_MASK        0xFFFFF
#define IB_GRH_FLOW_SHIFT       0
#define IB_GRH_NEXT_HDR         0x1B

#define IB_DEFAULT_GID_PREFIX   cpu_to_be64(0xfe80000000000000ULL)

/* Values for set/get portinfo VLCap OperationalVLs */
#define IB_VL_VL0       1
#define IB_VL_VL0_1     2
#define IB_VL_VL0_3     3
#define IB_VL_VL0_7     4
#define IB_VL_VL0_14    5

static inline int qib_num_vls(int vls)
{
        switch (vls) {
        default:
        case IB_VL_VL0:
                return 1;
        case IB_VL_VL0_1:
                return 2;
        case IB_VL_VL0_3:
                return 4;
        case IB_VL_VL0_7:
                return 8;
        case IB_VL_VL0_14:
                return 15;
        }
}

struct ib_reth {
        __be64 vaddr;
        __be32 rkey;
        __be32 length;
} __packed;

struct ib_atomic_eth {
        __be32 vaddr[2];        /* unaligned so access as 2 32-bit words */
        __be32 rkey;
        __be64 swap_data;
        __be64 compare_data;
} __packed;

struct qib_other_headers {
        __be32 bth[3];
        union {
                struct {
                        __be32 deth[2];
                        __be32 imm_data;
                } ud;
                struct {
                        struct ib_reth reth;
                        __be32 imm_data;
                } rc;
                struct {
                        __be32 aeth;
                        __be32 atomic_ack_eth[2];
                } at;
                __be32 imm_data;
                __be32 aeth;
                __be32 ieth;
                struct ib_atomic_eth atomic_eth;
        } u;
} __packed;

/*
 * Note that UD packets with a GRH header are 8+40+12+8 = 68 bytes
 * long (72 w/ imm_data).  Only the first 56 bytes of the IB header
 * will be in the eager header buffer.  The remaining 12 or 16 bytes
 * are in the data buffer.
 */
struct qib_ib_header {
        __be16 lrh[4];
        union {
                struct {
                        struct ib_grh grh;
                        struct qib_other_headers oth;
                } l;
                struct qib_other_headers oth;
        } u;
} __packed;

struct qib_pio_header {
        __le32 pbc[2];
        struct qib_ib_header hdr;
} __packed;

/*
 * qib specific data structure that will be hidden from rvt after the queue pair
 * is made common.
 */
struct qib_qp_priv {
        struct qib_ib_header *s_hdr;    /* next packet header to send */
        struct list_head iowait;        /* link for wait PIO buf */
        atomic_t s_dma_busy;
        struct qib_verbs_txreq *s_tx;
        struct work_struct s_work;
        wait_queue_head_t wait_dma;
        struct rvt_qp *owner;
};

#define QIB_PSN_CREDIT  16

struct qib_opcode_stats {
        u64 n_packets;          /* number of packets */
        u64 n_bytes;            /* total number of bytes */
};

struct qib_opcode_stats_perctx {
        struct qib_opcode_stats stats[128];
};

struct qib_pma_counters {
        u64 n_unicast_xmit;     /* total unicast packets sent */
        u64 n_unicast_rcv;      /* total unicast packets received */
        u64 n_multicast_xmit;   /* total multicast packets sent */
        u64 n_multicast_rcv;    /* total multicast packets received */
};

struct qib_ibport {
        struct rvt_ibport rvp;
        struct rvt_ah *smi_ah;
        __be64 guids[QIB_GUIDS_PER_PORT - 1];   /* writable GUIDs */
        struct qib_pma_counters __percpu *pmastats;
        u64 z_unicast_xmit;     /* starting count for PMA */
        u64 z_unicast_rcv;      /* starting count for PMA */
        u64 z_multicast_xmit;   /* starting count for PMA */
        u64 z_multicast_rcv;    /* starting count for PMA */
        u64 z_symbol_error_counter;             /* starting count for PMA */
        u64 z_link_error_recovery_counter;      /* starting count for PMA */
        u64 z_link_downed_counter;              /* starting count for PMA */
        u64 z_port_rcv_errors;                  /* starting count for PMA */
        u64 z_port_rcv_remphys_errors;          /* starting count for PMA */
        u64 z_port_xmit_discards;               /* starting count for PMA */
        u64 z_port_xmit_data;                   /* starting count for PMA */
        u64 z_port_rcv_data;                    /* starting count for PMA */
        u64 z_port_xmit_packets;                /* starting count for PMA */
        u64 z_port_rcv_packets;                 /* starting count for PMA */
        u32 z_local_link_integrity_errors;      /* starting count for PMA */
        u32 z_excessive_buffer_overrun_errors;  /* starting count for PMA */
        u32 z_vl15_dropped;                     /* starting count for PMA */
        u8 sl_to_vl[16];
};

struct qib_ibdev {
        struct rvt_dev_info rdi;

        struct list_head piowait;       /* list for wait PIO buf */
        struct list_head dmawait;       /* list for wait DMA */
        struct list_head txwait;        /* list for wait qib_verbs_txreq */
        struct list_head memwait;       /* list for wait kernel memory */
        struct list_head txreq_free;
        struct timer_list mem_timer;
        struct qib_pio_header *pio_hdrs;
        dma_addr_t pio_hdrs_phys;
        u32 qp_rnd; /* random bytes for hash */

        u32 n_piowait;
        u32 n_txwait;

#ifdef CONFIG_DEBUG_FS
        /* per HCA debugfs */
        struct dentry *qib_ibdev_dbg;
#endif
};

struct qib_verbs_counters {
        u64 symbol_error_counter;
        u64 link_error_recovery_counter;
        u64 link_downed_counter;
        u64 port_rcv_errors;
        u64 port_rcv_remphys_errors;
        u64 port_xmit_discards;
        u64 port_xmit_data;
        u64 port_rcv_data;
        u64 port_xmit_packets;
        u64 port_rcv_packets;
        u32 local_link_integrity_errors;
        u32 excessive_buffer_overrun_errors;
        u32 vl15_dropped;
};

static inline struct qib_ibdev *to_idev(struct ib_device *ibdev)
{
        struct rvt_dev_info *rdi;

        rdi = container_of(ibdev, struct rvt_dev_info, ibdev);
        return container_of(rdi, struct qib_ibdev, rdi);
}

/*
 * Send if not busy or waiting for I/O and either
 * a RC response is pending or we can process send work requests.
 */
static inline int qib_send_ok(struct rvt_qp *qp)
{
        return !(qp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT_IO)) &&
                (qp->s_hdrwords || (qp->s_flags & RVT_S_RESP_PENDING) ||
                 !(qp->s_flags & RVT_S_ANY_WAIT_SEND));
}

void _qib_schedule_send(struct rvt_qp *qp);
void qib_schedule_send(struct rvt_qp *qp);

static inline int qib_pkey_ok(u16 pkey1, u16 pkey2)
{
        u16 p1 = pkey1 & 0x7FFF;
        u16 p2 = pkey2 & 0x7FFF;

        /*
         * Low 15 bits must be non-zero and match, and
         * one of the two must be a full member.
         */
        return p1 && p1 == p2 && ((__s16)pkey1 < 0 || (__s16)pkey2 < 0);
}

void qib_bad_pqkey(struct qib_ibport *ibp, __be16 trap_num, u32 key, u32 sl,
                   u32 qp1, u32 qp2, __be16 lid1, __be16 lid2);
void qib_cap_mask_chg(struct rvt_dev_info *rdi, u8 port_num);
void qib_sys_guid_chg(struct qib_ibport *ibp);
void qib_node_desc_chg(struct qib_ibport *ibp);
int qib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
                    const struct ib_wc *in_wc, const struct ib_grh *in_grh,
                    const struct ib_mad_hdr *in, size_t in_mad_size,
                    struct ib_mad_hdr *out, size_t *out_mad_size,
                    u16 *out_mad_pkey_index);
void qib_notify_create_mad_agent(struct rvt_dev_info *rdi, int port_idx);
void qib_notify_free_mad_agent(struct rvt_dev_info *rdi, int port_idx);

/*
 * Compare the lower 24 bits of the two values.
 * Returns an integer <, ==, or > than zero.
 */
static inline int qib_cmp24(u32 a, u32 b)
{
        return (((int) a) - ((int) b)) << 8;
}

int qib_snapshot_counters(struct qib_pportdata *ppd, u64 *swords,
                          u64 *rwords, u64 *spkts, u64 *rpkts,
                          u64 *xmit_wait);

int qib_get_counters(struct qib_pportdata *ppd,
                     struct qib_verbs_counters *cntrs);

__be32 qib_compute_aeth(struct rvt_qp *qp);

/*
 * Functions provided by qib driver for rdmavt to use
 */
unsigned qib_free_all_qps(struct rvt_dev_info *rdi);
void *qib_qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp, gfp_t gfp);
void qib_qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp);
void qib_notify_qp_reset(struct rvt_qp *qp);
int qib_alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
                  enum ib_qp_type type, u8 port, gfp_t gfp);

#ifdef CONFIG_DEBUG_FS

struct qib_qp_iter;

struct qib_qp_iter *qib_qp_iter_init(struct qib_ibdev *dev);

int qib_qp_iter_next(struct qib_qp_iter *iter);

void qib_qp_iter_print(struct seq_file *s, struct qib_qp_iter *iter);

#endif

void qib_get_credit(struct rvt_qp *qp, u32 aeth);

unsigned qib_pkt_delay(u32 plen, u8 snd_mult, u8 rcv_mult);

void qib_verbs_sdma_desc_avail(struct qib_pportdata *ppd, unsigned avail);

void qib_put_txreq(struct qib_verbs_txreq *tx);

int qib_verbs_send(struct rvt_qp *qp, struct qib_ib_header *hdr,
                   u32 hdrwords, struct rvt_sge_state *ss, u32 len);

void qib_copy_sge(struct rvt_sge_state *ss, void *data, u32 length,
                  int release);

void qib_skip_sge(struct rvt_sge_state *ss, u32 length, int release);

void qib_uc_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr,
                int has_grh, void *data, u32 tlen, struct rvt_qp *qp);

void qib_rc_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr,
                int has_grh, void *data, u32 tlen, struct rvt_qp *qp);

int qib_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr);

int qib_check_send_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe);

struct ib_ah *qib_create_qp0_ah(struct qib_ibport *ibp, u16 dlid);

void qib_rc_rnr_retry(unsigned long arg);

void qib_rc_send_complete(struct rvt_qp *qp, struct qib_ib_header *hdr);

void qib_rc_error(struct rvt_qp *qp, enum ib_wc_status err);

int qib_post_ud_send(struct rvt_qp *qp, struct ib_send_wr *wr);

void qib_ud_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr,
                int has_grh, void *data, u32 tlen, struct rvt_qp *qp);

void mr_rcu_callback(struct rcu_head *list);

int qib_get_rwqe(struct rvt_qp *qp, int wr_id_only);

void qib_migrate_qp(struct rvt_qp *qp);

int qib_ruc_check_hdr(struct qib_ibport *ibp, struct qib_ib_header *hdr,
                      int has_grh, struct rvt_qp *qp, u32 bth0);

u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
                 struct ib_global_route *grh, u32 hwords, u32 nwords);

void qib_make_ruc_header(struct rvt_qp *qp, struct qib_other_headers *ohdr,
                         u32 bth0, u32 bth2);

void _qib_do_send(struct work_struct *work);

void qib_do_send(struct rvt_qp *qp);

void qib_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
                       enum ib_wc_status status);

void qib_send_rc_ack(struct rvt_qp *qp);

int qib_make_rc_req(struct rvt_qp *qp, unsigned long *flags);

int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags);

int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags);

int qib_register_ib_device(struct qib_devdata *);

void qib_unregister_ib_device(struct qib_devdata *);

void qib_ib_rcv(struct qib_ctxtdata *, void *, void *, u32);

void qib_ib_piobufavail(struct qib_devdata *);

unsigned qib_get_npkeys(struct qib_devdata *);

unsigned qib_get_pkey(struct qib_ibport *, unsigned);

extern const enum ib_wc_opcode ib_qib_wc_opcode[];

/*
 * Below  HCA-independent IB PhysPortState values, returned
 * by the f_ibphys_portstate() routine.
 */
#define IB_PHYSPORTSTATE_SLEEP 1
#define IB_PHYSPORTSTATE_POLL 2
#define IB_PHYSPORTSTATE_DISABLED 3
#define IB_PHYSPORTSTATE_CFG_TRAIN 4
#define IB_PHYSPORTSTATE_LINKUP 5
#define IB_PHYSPORTSTATE_LINK_ERR_RECOVER 6
#define IB_PHYSPORTSTATE_CFG_DEBOUNCE 8
#define IB_PHYSPORTSTATE_CFG_IDLE 0xB
#define IB_PHYSPORTSTATE_RECOVERY_RETRAIN 0xC
#define IB_PHYSPORTSTATE_RECOVERY_WAITRMT 0xE
#define IB_PHYSPORTSTATE_RECOVERY_IDLE 0xF
#define IB_PHYSPORTSTATE_CFG_ENH 0x10
#define IB_PHYSPORTSTATE_CFG_WAIT_ENH 0x13

extern const int ib_rvt_state_ops[];

extern __be64 ib_qib_sys_image_guid;    /* in network order */

extern unsigned int ib_rvt_lkey_table_size;

extern unsigned int ib_qib_max_cqes;

extern unsigned int ib_qib_max_cqs;

extern unsigned int ib_qib_max_qp_wrs;

extern unsigned int ib_qib_max_qps;

extern unsigned int ib_qib_max_sges;

extern unsigned int ib_qib_max_mcast_grps;

extern unsigned int ib_qib_max_mcast_qp_attached;

extern unsigned int ib_qib_max_srqs;

extern unsigned int ib_qib_max_srq_sges;

extern unsigned int ib_qib_max_srq_wrs;

extern const u32 ib_qib_rnr_table[];

#endif                          /* QIB_VERBS_H */