/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2018, Joyent, Inc.
 */


#include <sys/mdb_modapi.h>
#include <sys/mutex.h>
#include <sys/modctl.h>
#include <sys/scsi/scsi.h>
#include <sys/sunndi.h>
#include <sys/fibre-channel/fc.h>
#include <sys/fibre-channel/ulp/fcpvar.h>

static struct fcp_port  port;
static struct fcp_tgt   tgt;
static struct fcp_lun   lun;
static uint32_t tgt_hash_index;


/*
 * Leadville fcp walker/dcmd code
 */

static int
fcp_walk_i(mdb_walk_state_t *wsp)
{
        if (wsp->walk_addr == 0 &&
            mdb_readvar(&wsp->walk_addr, "fcp_port_head") == -1) {
                mdb_warn("failed to read 'fcp_port_head'");
                return (WALK_ERR);
        }

        wsp->walk_data = mdb_alloc(sizeof (struct fcp_port), UM_SLEEP);
        return (WALK_NEXT);
}

static int
fcp_walk_s(mdb_walk_state_t *wsp)
{
        int status;

        if (wsp->walk_addr == 0)
                return (WALK_DONE);

        if (mdb_vread(wsp->walk_data, sizeof (struct fcp_port),
            wsp->walk_addr) == -1) {
                mdb_warn("failed to read fcp_port at %p", wsp->walk_addr);
                return (WALK_DONE);
        }

        status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
            wsp->walk_cbdata);

        wsp->walk_addr =
            (uintptr_t)(((struct fcp_port *)wsp->walk_data)->port_next);

        return (status);
}

/*
 * The walker's fini function is invoked at the end of each walk.
 */
static void
fcp_walk_f(mdb_walk_state_t *wsp)
{
        mdb_free(wsp->walk_data, sizeof (struct fcp_port));
}


static int
fcp(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
        struct fcp_port         pinfo;

        if (argc != 0) {
                return (DCMD_USAGE);
        }

        if (!(flags & DCMD_ADDRSPEC)) {
                if (mdb_walk_dcmd("fcp", "fcp",
                    argc, argv) == -1) {
                        mdb_warn("failed to walk 'fcp_port_head'");
                        return (DCMD_ERR);
                }
                return (DCMD_OK);
        }

        mdb_printf("FCP structure at %p\n", addr);

        /*
         * For each port, we just need to read the fc_fca_port_t struct, read
         * the port_handle
         */
        if (mdb_vread(&pinfo, sizeof (struct fcp_port), addr) !=
            sizeof (struct fcp_port)) {
                mdb_warn("failed to read fcp_port at %p", addr);
                return (DCMD_OK);
        }

        mdb_printf("  mutex             : 0x%-08x\n", pinfo.port_mutex);
        mdb_printf("  ipkt_list         : 0x%p\n", pinfo.port_ipkt_list);
        mdb_printf("  state             : 0x%-08x\n", pinfo.port_state);
        mdb_printf("  phys_state        : 0x%-08x\n", pinfo.port_phys_state);
        mdb_printf("  top               : %u\n", pinfo.port_topology);
        mdb_printf("  sid               : 0x%-06x\n", pinfo.port_id);
        mdb_printf("  reset_list        : 0x%p\n", pinfo.port_reset_list);
        mdb_printf("  link_cnt          : %u\n", pinfo.port_link_cnt);
        mdb_printf("  deadline          : %d\n", pinfo.port_deadline);
        mdb_printf("  port wwn          : "
            "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
            pinfo.port_pwwn.raw_wwn[0], pinfo.port_pwwn.raw_wwn[1],
            pinfo.port_pwwn.raw_wwn[2], pinfo.port_pwwn.raw_wwn[3],
            pinfo.port_pwwn.raw_wwn[4], pinfo.port_pwwn.raw_wwn[5],
            pinfo.port_pwwn.raw_wwn[6], pinfo.port_pwwn.raw_wwn[7]);
        mdb_printf("  node wwn          : "
            "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
            pinfo.port_nwwn.raw_wwn[0], pinfo.port_nwwn.raw_wwn[1],
            pinfo.port_nwwn.raw_wwn[2], pinfo.port_nwwn.raw_wwn[3],
            pinfo.port_nwwn.raw_wwn[4], pinfo.port_nwwn.raw_wwn[5],
            pinfo.port_nwwn.raw_wwn[6], pinfo.port_nwwn.raw_wwn[7]);
        mdb_printf("  handle            : 0x%p\n", pinfo.port_fp_handle);
        mdb_printf("  cmd_mutex         : 0x%-08x\n", pinfo.port_pkt_mutex);
        mdb_printf("  ncmds             : %u\n", pinfo.port_npkts);
        mdb_printf("  pkt_head          : 0x%p\n", pinfo.port_pkt_head);
        mdb_printf("  pkt_tail          : 0x%p\n", pinfo.port_pkt_tail);
        mdb_printf("  ipkt_cnt          : %d\n", pinfo.port_ipkt_cnt);
        mdb_printf("  instance          : %u\n", pinfo.port_instance);
        mdb_printf("  max_exch          : %u\n", pinfo.port_max_exch);
        mdb_printf("  cmds_aborted      : 0x%-08x\n",
            pinfo.port_reset_action);
        mdb_printf("  cmds_dma_flags    : 0x%-08x\n",
            pinfo.port_cmds_dma_flags);
        mdb_printf("  fcp_dma           : 0x%-08x\n", pinfo.port_fcp_dma);
        mdb_printf("  priv_pkt_len      : %u\n", pinfo.port_priv_pkt_len);
        mdb_printf("  data_dma_attr     : 0x%-08x\n",
            pinfo.port_data_dma_attr);
        mdb_printf("  cmd_dma_attr      : 0x%-08x\n",
            pinfo.port_cmd_dma_attr);
        mdb_printf("  resp_dma_attr     : 0x%-08x\n",
            pinfo.port_resp_dma_attr);
        mdb_printf("  dma_acc_attr      : 0x%-08x\n",
            pinfo.port_dma_acc_attr);
        mdb_printf("  tran              : 0x%p\n", pinfo.port_tran);
        mdb_printf("  dip               : 0x%p\n", pinfo.port_dip);
        mdb_printf("  reset_notify_listf: 0x%p\n",
            pinfo.port_reset_notify_listf);
        mdb_printf("  event_defs        : 0x%p\n", pinfo.port_ndi_event_defs);
        mdb_printf("  event_hdl         : 0x%p\n", pinfo.port_ndi_event_hdl);
        mdb_printf("  events            : 0x%p\n", pinfo.port_ndi_events);
        mdb_printf("  tgt_hash_table    : 0x%p\n", pinfo.port_tgt_hash_table);
        mdb_printf("  mpxio             : %d\n", pinfo.port_mpxio);

        mdb_printf("\n");

        return (DCMD_OK);
}


/*
 * Leadville cmds walker/dcmd code
 */

static int
cmds_walk_i(mdb_walk_state_t *wsp)
{
        if (wsp->walk_addr == 0) {
                mdb_warn("Can not perform global walk");
                return (WALK_ERR);
        }

        /*
         * Input should be a fcp_lun, so read it to get the fcp_pkt
         * lists's head
         */

        if (mdb_vread(&lun, sizeof (struct fcp_lun), wsp->walk_addr) !=
            sizeof (struct fcp_lun)) {
                mdb_warn("Unable to read in the fcp_lun structure address\n");
                return (WALK_ERR);
        }

        wsp->walk_addr = (uintptr_t)(lun.lun_pkt_head);
        wsp->walk_data = mdb_alloc(sizeof (struct fcp_pkt), UM_SLEEP);

        return (WALK_NEXT);
}

static int
cmds_walk_s(mdb_walk_state_t *wsp)
{
        int status;

        if (wsp->walk_addr == 0)
                return (WALK_DONE);

        if (mdb_vread(wsp->walk_data, sizeof (struct fcp_pkt),
            wsp->walk_addr) == -1) {
                mdb_warn("failed to read fcp_pkt at %p", wsp->walk_addr);
                return (WALK_DONE);
        }

        status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
            wsp->walk_cbdata);

        wsp->walk_addr =
            (uintptr_t)(((struct fcp_pkt *)wsp->walk_data)->cmd_forw);

        return (status);
}

/*
 * The walker's fini function is invoked at the end of each walk.
 */
static void
cmds_walk_f(mdb_walk_state_t *wsp)
{
        mdb_free(wsp->walk_data, sizeof (struct fcp_pkt));
}


/*
 * Leadville luns walker/dcmd code
 */

static int
luns_walk_i(mdb_walk_state_t *wsp)
{
        if (wsp->walk_addr == 0) {
                mdb_warn("Can not perform global walk");
                return (WALK_ERR);
        }

        /*
         * Input should be a fcp_tgt, so read it to get the fcp_lun
         * lists's head
         */

        if (mdb_vread(&tgt, sizeof (struct fcp_tgt), wsp->walk_addr) !=
            sizeof (struct fcp_tgt)) {
                mdb_warn("Unable to read in the fcp_tgt structure address\n");
                return (WALK_ERR);
        }

        wsp->walk_addr = (uintptr_t)(tgt.tgt_lun);
        wsp->walk_data = mdb_alloc(sizeof (struct fcp_lun), UM_SLEEP);

        return (WALK_NEXT);
}

static int
luns_walk_s(mdb_walk_state_t *wsp)
{
        int status;

        if (wsp->walk_addr == 0)
                return (WALK_DONE);

        if (mdb_vread(wsp->walk_data, sizeof (struct fcp_lun),
            wsp->walk_addr) == -1) {
                mdb_warn("failed to read fcp_pkt at %p", wsp->walk_addr);
                return (WALK_DONE);
        }

        status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
            wsp->walk_cbdata);

        wsp->walk_addr =
            (uintptr_t)(((struct fcp_lun *)wsp->walk_data)->lun_next);

        return (status);
}

/*
 * The walker's fini function is invoked at the end of each walk.
 */
static void
luns_walk_f(mdb_walk_state_t *wsp)
{
        mdb_free(wsp->walk_data, sizeof (struct fcp_lun));
}


/*
 * Leadville targets walker/dcmd code
 */

static int
targets_walk_i(mdb_walk_state_t *wsp)
{
        if (wsp->walk_addr == 0) {
                mdb_warn("Can not perform global walk\n");
                return (WALK_ERR);
        }

        /*
         * Input should be a fcp_port, so read it to get the port_tgt
         * table's head
         */

        if (mdb_vread(&port, sizeof (struct fcp_port), wsp->walk_addr) !=
            sizeof (struct fcp_port)) {
                mdb_warn("Unable to read in the port structure address\n");
                return (WALK_ERR);
        }

        tgt_hash_index = 0;

        while (tgt_hash_index < FCP_NUM_HASH &&
            port.port_tgt_hash_table[tgt_hash_index] == NULL) {
                tgt_hash_index++;
        }

        wsp->walk_addr = (uintptr_t)(port.port_tgt_hash_table[tgt_hash_index]);

        wsp->walk_data = mdb_alloc(sizeof (struct fcp_tgt), UM_SLEEP);

        return (WALK_NEXT);
}

static int
targets_walk_s(mdb_walk_state_t *wsp)
{
        int status;

        if ((wsp->walk_addr == 0) &&
            (tgt_hash_index >= (FCP_NUM_HASH - 1))) {
                return (WALK_DONE);
        }

        if (mdb_vread(wsp->walk_data, sizeof (struct fcp_tgt),
            wsp->walk_addr) == -1) {
                mdb_warn("failed to read fcp_tgt at %p", wsp->walk_addr);
                return (WALK_DONE);
        }

        status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
            wsp->walk_cbdata);

        wsp->walk_addr =
            (uintptr_t)(((struct fcp_tgt *)wsp->walk_data)->tgt_next);

        if (wsp->walk_addr == 0) {
                /*
                 * locate the next hash list
                 */

                tgt_hash_index++;

                while (tgt_hash_index < FCP_NUM_HASH &&
                    port.port_tgt_hash_table[tgt_hash_index] == NULL)
                        tgt_hash_index++;

                if (tgt_hash_index == FCP_NUM_HASH) {
                        /* You're done */
                        return (status);
                }

                wsp->walk_addr =
                    (uintptr_t)(port.port_tgt_hash_table[tgt_hash_index]);
        }

        return (status);
}

/*
 * The walker's fini function is invoked at the end of each walk.
 */
static void
targets_walk_f(mdb_walk_state_t *wsp)
{
        mdb_free(wsp->walk_data, sizeof (struct fcp_tgt));
}


/*
 * Leadville fcp_ipkt walker/dcmd code
 */

static int
ipkt_walk_i(mdb_walk_state_t *wsp)
{
        if (wsp->walk_addr == 0) {
                mdb_warn("The address of a fcp_port"
                    " structure must be given\n");
                return (WALK_ERR);
        }

        /*
         * Input should be a fcp_port, so read it to get the ipkt
         * list's head
         */

        if (mdb_vread(&port, sizeof (struct fcp_port), wsp->walk_addr) !=
            sizeof (struct fcp_port)) {
                mdb_warn("Failed to read in the fcp_port"
                    " at 0x%p\n", wsp->walk_addr);
                return (WALK_ERR);
        }

        wsp->walk_addr = (uintptr_t)(port.port_ipkt_list);
        wsp->walk_data = mdb_alloc(sizeof (struct fcp_ipkt), UM_SLEEP);

        return (WALK_NEXT);
}

static int
ipkt_walk_s(mdb_walk_state_t *wsp)
{
        int status;

        if (wsp->walk_addr == 0)
                return (WALK_DONE);

        if (mdb_vread(wsp->walk_data, sizeof (struct fcp_ipkt),
            wsp->walk_addr) == -1) {
                mdb_warn("Failed to read in the fcp_ipkt"
                    " at 0x%p\n", wsp->walk_addr);
                return (WALK_DONE);
        }

        status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
            wsp->walk_cbdata);

        wsp->walk_addr =
            (uintptr_t)(((struct fcp_ipkt *)wsp->walk_data)->ipkt_next);

        return (status);
}

/*
 * The walker's fini function is invoked at the end of each walk.
 */
static void
ipkt_walk_f(mdb_walk_state_t *wsp)
{
        mdb_free(wsp->walk_data, sizeof (struct fcp_ipkt));
}

/*
 * Leadville fcp_pkt walker/dcmd code
 */

static int
pkt_walk_i(mdb_walk_state_t *wsp)
{
        if (wsp->walk_addr == 0) {
                mdb_warn("The address of a fcp_port"
                    " structure must be given\n");
                return (WALK_ERR);
        }

        /*
         * Input should be an fcp_port, so read it to get the pkt
         * list's head
         */

        if (mdb_vread(&port, sizeof (struct fcp_port), wsp->walk_addr) !=
            sizeof (struct fcp_port)) {
                mdb_warn("Failed to read in the fcp_port"
                    " at 0x%p\n", wsp->walk_addr);
                return (WALK_ERR);
        }

        wsp->walk_addr = (uintptr_t)(port.port_pkt_head);
        wsp->walk_data = mdb_alloc(sizeof (struct fcp_pkt), UM_SLEEP);

        return (WALK_NEXT);
}

static int
pkt_walk_s(mdb_walk_state_t *wsp)
{
        int status;

        if (wsp->walk_addr == 0)
                return (WALK_DONE);

        if (mdb_vread(wsp->walk_data, sizeof (struct fcp_pkt),
            wsp->walk_addr) == -1) {
                mdb_warn("Failed to read in the fcp_pkt"
                    " at 0x%p\n", wsp->walk_addr);
                return (WALK_DONE);
        }

        status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
            wsp->walk_cbdata);

        wsp->walk_addr =
            (uintptr_t)(((struct fcp_pkt *)wsp->walk_data)->cmd_next);

        return (status);
}

/*
 * The walker's fini function is invoked at the end of each walk.
 */
static void
pkt_walk_f(mdb_walk_state_t *wsp)
{
        mdb_free(wsp->walk_data, sizeof (struct fcp_pkt));
}

/*
 * MDB module linkage information:
 *
 * We declare a list of structures describing our dcmds, a list of structures
 * describing our walkers, and a function named _mdb_init to return a pointer
 * to our module information.
 */

static const mdb_dcmd_t dcmds[] = {
        { "fcp", NULL, "Leadville fcp instances", fcp },
        { NULL }
};

static const mdb_walker_t walkers[] = {
        { "fcp", "Walk list of Leadville fcp instances",
                fcp_walk_i, fcp_walk_s, fcp_walk_f },
        { "cmds", "Walk list of SCSI commands in fcp's per-lun queue",
                cmds_walk_i, cmds_walk_s, cmds_walk_f },
        { "luns", "Walk list of LUNs in an fcp target",
                luns_walk_i, luns_walk_s, luns_walk_f },
        { "targets", "Walk list of fcp targets attached to the local port",
                targets_walk_i, targets_walk_s, targets_walk_f },
        { "fcp_ipkt", "Walk list of internal packets queued on a local port",
                ipkt_walk_i, ipkt_walk_s, ipkt_walk_f},
        { "fcp_pkt", "Walk list of packets queued on a local port",
                pkt_walk_i, pkt_walk_s, pkt_walk_f},
        { NULL }
};

static const mdb_modinfo_t modinfo = {
        MDB_API_VERSION, dcmds, walkers
};

const mdb_modinfo_t *
_mdb_init(void)
{
        return (&modinfo);
}