/*      $OpenBSD: mpath_sym.c,v 1.28 2022/07/02 08:50:42 visa Exp $ */

/*
 * Copyright (c) 2010 David Gwynne <dlg@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/queue.h>
#include <sys/rwlock.h>
#include <sys/pool.h>
#include <sys/ioctl.h>

#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/mpathvar.h>

struct sym_softc {
        struct device           sc_dev;
        struct mpath_path       sc_path;
};
#define DEVNAME(_s) ((_s)->sc_dev.dv_xname)

int             sym_match(struct device *, void *, void *);
void            sym_attach(struct device *, struct device *, void *);
int             sym_detach(struct device *, int);
int             sym_activate(struct device *, int);

const struct cfattach sym_ca = {
        sizeof(struct sym_softc),
        sym_match,
        sym_attach,
        sym_detach,
        sym_activate
};

struct cfdriver sym_cd = {
        NULL,
        "sym",
        DV_DULL
};

void            sym_mpath_start(struct scsi_xfer *);
int             sym_mpath_checksense(struct scsi_xfer *);
void            sym_mpath_status(struct scsi_link *);

const struct mpath_ops sym_mpath_sym_ops = {
        "sym",
        sym_mpath_checksense,
        sym_mpath_status
};

const struct mpath_ops sym_mpath_asym_ops = {
        "sym",
        sym_mpath_checksense,
        sym_mpath_status
};

struct sym_device {
        char *vendor;
        char *product;
};

struct sym_device sym_devices[] = {
/*        " vendor "  "     device     " */
/*        "01234567"  "0123456789012345" */
        { "TOSHIBA ", "MBF" },
        { "SEAGATE ", "ST" },
        { "SGI     ", "ST" },
        { "FUJITSU ", "MBD" },
        { "FUJITSU ", "MA" }
};

struct sym_device asym_devices[] = {
/*        " vendor "  "     device     " */
/*        "01234567"  "0123456789012345" */
        { "DELL    ", "MD1220          " },
        { "DELL    ", "MD3060e         " },
        { "SUN     ", "StorEdge 3510F D" },
        { "SUNW    ", "SUNWGS INT FCBPL" },
        { "Transtec", "PROVIGO1100" },
        { "NetBSD", "NetBSD iSCSI" }
};

int
sym_match(struct device *parent, void *match, void *aux)
{
        struct scsi_attach_args *sa = aux;
        struct scsi_inquiry_data *inq = &sa->sa_sc_link->inqdata;
        struct sym_device *s;
        int i;

        if (mpath_path_probe(sa->sa_sc_link) != 0)
                return (0);

        for (i = 0; i < nitems(sym_devices); i++) {
                s = &sym_devices[i];

                if (bcmp(s->vendor, inq->vendor, strlen(s->vendor)) == 0 &&
                    bcmp(s->product, inq->product, strlen(s->product)) == 0)
                        return (8);
        }
        for (i = 0; i < nitems(asym_devices); i++) {
                s = &asym_devices[i];

                if (bcmp(s->vendor, inq->vendor, strlen(s->vendor)) == 0 &&
                    bcmp(s->product, inq->product, strlen(s->product)) == 0)
                        return (8);
        }

        return (0);
}

void
sym_attach(struct device *parent, struct device *self, void *aux)
{
        struct sym_softc *sc = (struct sym_softc *)self;
        struct scsi_attach_args *sa = aux;
        struct scsi_link *link = sa->sa_sc_link;
        struct scsi_inquiry_data *inq = &link->inqdata;
        const struct mpath_ops *ops = &sym_mpath_sym_ops;
        struct sym_device *s;
        u_int id = 0;
        int i;

        printf("\n");

        /* check if we're an asymmetric access device */
        for (i = 0; i < nitems(asym_devices); i++) {
                s = &asym_devices[i];

                if (bcmp(s->vendor, inq->vendor, strlen(s->vendor)) == 0 &&
                    bcmp(s->product, inq->product, strlen(s->product)) == 0) {
                        ops = &sym_mpath_asym_ops;
                        id = sc->sc_dev.dv_unit;
                        break;
                }
        }

        /* init link */
        link->device_softc = sc;

        /* init path */
        scsi_xsh_set(&sc->sc_path.p_xsh, link, sym_mpath_start);
        sc->sc_path.p_link = link;

        if (mpath_path_attach(&sc->sc_path, id, ops) != 0)
                printf("%s: unable to attach path\n", DEVNAME(sc));
}

int
sym_detach(struct device *self, int flags)
{
        return (0);
}

int
sym_activate(struct device *self, int act)
{
        struct sym_softc *sc = (struct sym_softc *)self;

        switch (act) {
        case DVACT_DEACTIVATE:
                if (sc->sc_path.p_group != NULL)
                        mpath_path_detach(&sc->sc_path);
                break;
        }
        return (0);
}

void
sym_mpath_start(struct scsi_xfer *xs)
{
        struct sym_softc *sc = xs->sc_link->device_softc;

        mpath_start(&sc->sc_path, xs);
}

int
sym_mpath_checksense(struct scsi_xfer *xs)
{
        return (MPATH_SENSE_DECLINED);
}

void
sym_mpath_status(struct scsi_link *link)
{
        struct sym_softc *sc = link->device_softc;

        mpath_path_status(&sc->sc_path, MPATH_S_ACTIVE);
}