ctl_frontend_cam_sim.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2009 Silicon Graphics International Corp.
 * All rights reserved.
 *
 * 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,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 *
 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend_cam_sim.c#4 $
 */
/*
 * CTL frontend to CAM SIM interface.  This allows access to CTL LUNs via
 * the da(4) and pass(4) drivers from inside the system.
 *
 * Author: Ken Merry <ken@FreeBSD.org>
 */
 
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
 
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <sys/sysctl.h>
#include <machine/atomic.h>
#include <machine/bus.h>
#include <sys/sbuf.h>
 
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/cam_xpt.h>
#include <cam/cam_periph.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/ctl/ctl_io.h>
#include <cam/ctl/ctl.h>
#include <cam/ctl/ctl_frontend.h>
#include <cam/ctl/ctl_debug.h>
 
#define io_ptr          spriv_ptr1
 
struct cfcs_io {
        union ccb *ccb;
};
 
struct cfcs_softc {
        struct ctl_port port;
        char port_name[32];
        struct cam_sim *sim;
        struct cam_devq *devq;
        struct cam_path *path;
        uint64_t wwnn;
        uint64_t wwpn;
        uint32_t cur_tag_num;
        int online;
};
 
/*
 * We can't handle CCBs with these flags.  For the most part, we just don't
 * handle physical addresses yet.  That would require mapping things in
 * order to do the copy.
 */
#define CFCS_BAD_CCB_FLAGS (CAM_DATA_ISPHYS | CAM_CDB_PHYS | CAM_SENSE_PTR |            \
        CAM_SENSE_PHYS)
 
static int cfcs_init(void);
static int cfcs_shutdown(void);
static void cfcs_poll(struct cam_sim *sim);
static void cfcs_online(void *arg);
static void cfcs_offline(void *arg);
static void cfcs_datamove(union ctl_io *io);
static void cfcs_done(union ctl_io *io);
void cfcs_action(struct cam_sim *sim, union ccb *ccb);
 
struct cfcs_softc cfcs_softc;
/*
 * This is primarily intended to allow for error injection to test the CAM
 * sense data and sense residual handling code.  This sets the maximum
 * amount of SCSI sense data that we will report to CAM.
 */
static int cfcs_max_sense = sizeof(struct scsi_sense_data);
 
SYSCTL_NODE(_kern_cam, OID_AUTO, ctl2cam, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "CAM Target Layer SIM frontend");
SYSCTL_INT(_kern_cam_ctl2cam, OID_AUTO, max_sense, CTLFLAG_RW,
           &cfcs_max_sense, 0, "Maximum sense data size");
 
static struct ctl_frontend cfcs_frontend =
{
        .name = "camsim",
        .init = cfcs_init,
        .shutdown = cfcs_shutdown,
};
CTL_FRONTEND_DECLARE(ctlcfcs, cfcs_frontend);
 
static int
cfcs_init(void)
{
        struct cfcs_softc *softc;
        struct ctl_port *port;
        int retval;
 
        softc = &cfcs_softc;
        bzero(softc, sizeof(*softc));
        port = &softc->port;
 
        port->frontend = &cfcs_frontend;
        port->port_type = CTL_PORT_INTERNAL;
        /* XXX KDM what should the real number be here? */
        port->num_requested_ctl_io = 4096;
        snprintf(softc->port_name, sizeof(softc->port_name), "camsim");
        port->port_name = softc->port_name;
        port->port_online = cfcs_online;
        port->port_offline = cfcs_offline;
        port->onoff_arg = softc;
        port->fe_datamove = cfcs_datamove;
        port->fe_done = cfcs_done;
        port->targ_port = -1;
 
        retval = ctl_port_register(port);
        if (retval != 0) {
                printf("%s: ctl_port_register() failed with error %d!\n",
                       __func__, retval);
                return (retval);
        }
 
        /*
         * If the CTL frontend didn't tell us what our WWNN/WWPN is, go
         * ahead and set something random.
         */
        if (port->wwnn == 0) {
                uint64_t random_bits;
 
                arc4rand(&random_bits, sizeof(random_bits), 0);
                softc->wwnn = (random_bits & 0x0000000fffffff00ULL) |
                        /* Company ID */ 0x5000000000000000ULL |
                        /* NL-Port */    0x0300;
                softc->wwpn = softc->wwnn + port->targ_port + 1;
                ctl_port_set_wwns(port, true, softc->wwnn, true, softc->wwpn);
        } else {
                softc->wwnn = port->wwnn;
                softc->wwpn = port->wwpn;
        }
 
        softc->devq = cam_simq_alloc(port->num_requested_ctl_io);
        if (softc->devq == NULL) {
                printf("%s: error allocating devq\n", __func__);
                retval = ENOMEM;
                goto bailout;
        }
 
        softc->sim = cam_sim_alloc(cfcs_action, cfcs_poll, softc->port_name,
                                   softc, /*unit*/ 0, NULL, 1,
                                   port->num_requested_ctl_io, softc->devq);
        if (softc->sim == NULL) {
                printf("%s: error allocating SIM\n", __func__);
                retval = ENOMEM;
                goto bailout;
        }
 
        if (xpt_bus_register(softc->sim, NULL, 0) != CAM_SUCCESS) {
                printf("%s: error registering SIM\n", __func__);
                retval = ENOMEM;
                goto bailout;
        }
 
        if (xpt_create_path(&softc->path, /*periph*/NULL,
                            cam_sim_path(softc->sim),
                            CAM_TARGET_WILDCARD,
                            CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
                printf("%s: error creating path\n", __func__);
                xpt_bus_deregister(cam_sim_path(softc->sim));
                retval = EINVAL;
                goto bailout;
        }
 
        return (retval);
 
bailout:
        if (softc->sim)
                cam_sim_free(softc->sim, /*free_devq*/ TRUE);
        else if (softc->devq)
                cam_simq_free(softc->devq);
        return (retval);
}
 
static int
cfcs_shutdown(void)
{
        struct cfcs_softc *softc = &cfcs_softc;
        struct ctl_port *port = &softc->port;
        int error;
 
        ctl_port_offline(port);
 
        xpt_free_path(softc->path);
        xpt_bus_deregister(cam_sim_path(softc->sim));
        cam_sim_free(softc->sim, /*free_devq*/ TRUE);
 
        if ((error = ctl_port_deregister(port)) != 0)
                printf("%s: cam_sim port deregistration failed\n", __func__);
        return (error);
}
 
static void
cfcs_poll(struct cam_sim *sim)
{
 
}
 
static void
cfcs_onoffline(void *arg, int online)
{
        struct cfcs_softc *softc = (struct cfcs_softc *)arg;
        union ccb *ccb;
 
        softc->online = online;
 
        ccb = xpt_alloc_ccb_nowait();
        if (ccb == NULL) {
                printf("%s: unable to allocate CCB for rescan\n", __func__);
                return;
        }
 
        if (xpt_create_path(&ccb->ccb_h.path, NULL,
                            cam_sim_path(softc->sim), CAM_TARGET_WILDCARD,
                            CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
                printf("%s: can't allocate path for rescan\n", __func__);
                xpt_free_ccb(ccb);
                return;
        }
        xpt_rescan(ccb);
}
 
static void
cfcs_online(void *arg)
{
        cfcs_onoffline(arg, /*online*/ 1);
}
 
static void
cfcs_offline(void *arg)
{
        cfcs_onoffline(arg, /*online*/ 0);
}
 
/*
 * This function is very similar to ctl_ioctl_do_datamove().  Is there a
 * way to combine the functionality?
 *
 * XXX KDM may need to move this into a thread.  We're doing a bcopy in the
 * caller's context, which will usually be the backend.  That may not be a
 * good thing.
 */
static void
cfcs_datamove(union ctl_io *io)
{
        union ccb *ccb;
        bus_dma_segment_t cam_sg_entry, *cam_sglist;
        struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
        int cam_sg_count, ctl_sg_count, cam_sg_start;
        int cam_sg_offset;
        int len_to_copy;
        int ctl_watermark, cam_watermark;
        int i, j;
 
        ccb = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
 
        /*
         * Note that we have a check in cfcs_action() to make sure that any
         * CCBs with "bad" flags are returned with CAM_REQ_INVALID.  This
         * is just to make sure no one removes that check without updating
         * this code to provide the additional functionality necessary to
         * support those modes of operation.
         */
        KASSERT(((ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS) == 0), ("invalid "
                  "CAM flags %#x", (ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS)));
 
        /*
         * Simplify things on both sides by putting single buffers into a
         * single entry S/G list.
         */
        switch ((ccb->ccb_h.flags & CAM_DATA_MASK)) {
        case CAM_DATA_SG: {
                int len_seen;
 
                cam_sglist = (bus_dma_segment_t *)ccb->csio.data_ptr;
                cam_sg_count = ccb->csio.sglist_cnt;
                cam_sg_start = cam_sg_count;
                cam_sg_offset = 0;
 
                for (i = 0, len_seen = 0; i < cam_sg_count; i++) {
                        if ((len_seen + cam_sglist[i].ds_len) >=
                             io->scsiio.kern_rel_offset) {
                                cam_sg_start = i;
                                cam_sg_offset = io->scsiio.kern_rel_offset -
                                        len_seen;
                                break;
                        }
                        len_seen += cam_sglist[i].ds_len;
                }
                break;
        }
        case CAM_DATA_VADDR:
                cam_sglist = &cam_sg_entry;
                cam_sglist[0].ds_len = ccb->csio.dxfer_len;
                cam_sglist[0].ds_addr = (bus_addr_t)(uintptr_t)ccb->csio.data_ptr;
                cam_sg_count = 1;
                cam_sg_start = 0;
                cam_sg_offset = io->scsiio.kern_rel_offset;
                break;
        default:
                panic("Invalid CAM flags %#x", ccb->ccb_h.flags);
        }
 
        if (io->scsiio.kern_sg_entries > 0) {
                ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
                ctl_sg_count = io->scsiio.kern_sg_entries;
        } else {
                ctl_sglist = &ctl_sg_entry;
                ctl_sglist->addr = io->scsiio.kern_data_ptr;
                ctl_sglist->len = io->scsiio.kern_data_len;
                ctl_sg_count = 1;
        }
 
        ctl_watermark = 0;
        cam_watermark = cam_sg_offset;
        for (i = cam_sg_start, j = 0;
             i < cam_sg_count && j < ctl_sg_count;) {
                uint8_t *cam_ptr, *ctl_ptr;
 
                len_to_copy = MIN(cam_sglist[i].ds_len - cam_watermark,
                                  ctl_sglist[j].len - ctl_watermark);
 
                cam_ptr = (uint8_t *)(uintptr_t)cam_sglist[i].ds_addr;
                cam_ptr = cam_ptr + cam_watermark;
                if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) {
                        /*
                         * XXX KDM fix this!
                         */
                        panic("need to implement bus address support");
#if 0
                        kern_ptr = bus_to_virt(kern_sglist[j].addr);
#endif
                } else
                        ctl_ptr = (uint8_t *)ctl_sglist[j].addr;
                ctl_ptr = ctl_ptr + ctl_watermark;
 
                if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) ==
                     CTL_FLAG_DATA_IN) {
                        CTL_DEBUG_PRINT(("%s: copying %d bytes to CAM\n",
                                         __func__, len_to_copy));
                        CTL_DEBUG_PRINT(("%s: from %p to %p\n", ctl_ptr,
                                         __func__, cam_ptr));
                        bcopy(ctl_ptr, cam_ptr, len_to_copy);
                } else {
                        CTL_DEBUG_PRINT(("%s: copying %d bytes from CAM\n",
                                         __func__, len_to_copy));
                        CTL_DEBUG_PRINT(("%s: from %p to %p\n", cam_ptr,
                                         __func__, ctl_ptr));
                        bcopy(cam_ptr, ctl_ptr, len_to_copy);
                }
 
                io->scsiio.ext_data_filled += len_to_copy;
                io->scsiio.kern_data_resid -= len_to_copy;
 
                cam_watermark += len_to_copy;
                if (cam_sglist[i].ds_len == cam_watermark) {
                        i++;
                        cam_watermark = 0;
                }
 
                ctl_watermark += len_to_copy;
                if (ctl_sglist[j].len == ctl_watermark) {
                        j++;
                        ctl_watermark = 0;
                }
        }
 
        if ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS) {
                io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = NULL;
                io->io_hdr.flags |= CTL_FLAG_STATUS_SENT;
                ccb->csio.resid = ccb->csio.dxfer_len -
                    io->scsiio.ext_data_filled;
                ccb->ccb_h.status &= ~CAM_STATUS_MASK;
                ccb->ccb_h.status |= CAM_REQ_CMP;
                xpt_done(ccb);
        }
 
        ctl_datamove_done(io, true);
}
 
static void
cfcs_done(union ctl_io *io)
{
        union ccb *ccb;
 
        ccb = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
        if (ccb == NULL) {
                ctl_free_io(io);
                return;
        }
 
        /*
         * At this point we should have status.  If we don't, that's a bug.
         */
        KASSERT(((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE),
                ("invalid CTL status %#x", io->io_hdr.status));
 
        /*
         * Translate CTL status to CAM status.
         */
        if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
                ccb->csio.resid = ccb->csio.dxfer_len -
                    io->scsiio.ext_data_filled;
        }
        ccb->ccb_h.status &= ~CAM_STATUS_MASK;
        switch (io->io_hdr.status & CTL_STATUS_MASK) {
        case CTL_SUCCESS:
                ccb->ccb_h.status |= CAM_REQ_CMP;
                break;
        case CTL_SCSI_ERROR:
                ccb->ccb_h.status |= CAM_SCSI_STATUS_ERROR | CAM_AUTOSNS_VALID;
                ccb->csio.scsi_status = io->scsiio.scsi_status;
                bcopy(&io->scsiio.sense_data, &ccb->csio.sense_data,
                      min(io->scsiio.sense_len, ccb->csio.sense_len));
                if (ccb->csio.sense_len > io->scsiio.sense_len)
                        ccb->csio.sense_resid = ccb->csio.sense_len -
                                                io->scsiio.sense_len;
                else
                        ccb->csio.sense_resid = 0;
                if ((ccb->csio.sense_len - ccb->csio.sense_resid) >
                     cfcs_max_sense) {
                        ccb->csio.sense_resid = ccb->csio.sense_len -
                                                cfcs_max_sense;
                }
                break;
        case CTL_CMD_ABORTED:
                ccb->ccb_h.status |= CAM_REQ_ABORTED;
                break;
        case CTL_ERROR:
        default:
                ccb->ccb_h.status |= CAM_REQ_CMP_ERR;
                break;
        }
        ctl_free_io(io);
        if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP &&
            (ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
                xpt_freeze_devq(ccb->ccb_h.path, 1);
                ccb->ccb_h.status |= CAM_DEV_QFRZN;
        }
        xpt_done(ccb);
}
 
void
cfcs_action(struct cam_sim *sim, union ccb *ccb)
{
        struct cfcs_softc *softc;
        int err;
 
        softc = (struct cfcs_softc *)cam_sim_softc(sim);
 
        switch (ccb->ccb_h.func_code) {
        case XPT_SCSI_IO: {
                union ctl_io *io;
                struct ccb_scsiio *csio;
 
                csio = &ccb->csio;
 
                /*
                 * Catch CCB flags, like physical address flags, that
                 * indicate situations we currently can't handle.
                 */
                if (ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS) {
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        printf("%s: bad CCB flags %#x (all flags %#x)\n",
                               __func__, ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS,
                               ccb->ccb_h.flags);
                        xpt_done(ccb);
                        return;
                }
 
                /*
                 * If we aren't online, there are no devices to see.
                 */
                if (softc->online == 0) {
                        ccb->ccb_h.status = CAM_DEV_NOT_THERE;
                        xpt_done(ccb);
                        return;
                }
 
                io = ctl_alloc_io_nowait(softc->port.ctl_pool_ref);
                if (io == NULL) {
                        printf("%s: can't allocate ctl_io\n", __func__);
                        ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
                        xpt_freeze_devq(ccb->ccb_h.path, 1);
                        xpt_done(ccb);
                        return;
                }
                ctl_zero_io(io);
                /* Save pointers on both sides */
                io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = ccb;
                ccb->ccb_h.io_ptr = io;
 
                /*
                 * Only SCSI I/O comes down this path, resets, etc. come
                 * down via the XPT_RESET_BUS/LUN CCBs below.
                 */
                io->io_hdr.io_type = CTL_IO_SCSI;
                io->io_hdr.nexus.initid = 1;
                io->io_hdr.nexus.targ_port = softc->port.targ_port;
                io->io_hdr.nexus.targ_lun = ctl_decode_lun(
                    CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
                io->scsiio.priority = csio->priority;
                /*
                 * This tag scheme isn't the best, since we could in theory
                 * have a very long-lived I/O and tag collision, especially
                 * in a high I/O environment.  But it should work well
                 * enough for now.  Since we're using unsigned ints,
                 * they'll just wrap around.
                 */
                io->scsiio.tag_num = atomic_fetchadd_32(&softc->cur_tag_num, 1);
                csio->tag_id = io->scsiio.tag_num;
                switch (csio->tag_action) {
                case CAM_TAG_ACTION_NONE:
                        io->scsiio.tag_type = CTL_TAG_UNTAGGED;
                        break;
                case MSG_SIMPLE_TASK:
                        io->scsiio.tag_type = CTL_TAG_SIMPLE;
                        break;
                case MSG_HEAD_OF_QUEUE_TASK:
                        io->scsiio.tag_type = CTL_TAG_HEAD_OF_QUEUE;
                        break;
                case MSG_ORDERED_TASK:
                        io->scsiio.tag_type = CTL_TAG_ORDERED;
                        break;
                case MSG_ACA_TASK:
                        io->scsiio.tag_type = CTL_TAG_ACA;
                        break;
                default:
                        io->scsiio.tag_type = CTL_TAG_UNTAGGED;
                        printf("%s: unhandled tag type %#x!!\n", __func__,
                               csio->tag_action);
                        break;
                }
                if (csio->cdb_len > sizeof(io->scsiio.cdb)) {
                        printf("%s: WARNING: CDB len %d > ctl_io space %zd\n",
                               __func__, csio->cdb_len, sizeof(io->scsiio.cdb));
                }
                io->scsiio.cdb_len = min(csio->cdb_len, sizeof(io->scsiio.cdb));
                bcopy(scsiio_cdb_ptr(csio), io->scsiio.cdb, io->scsiio.cdb_len);
 
                ccb->ccb_h.status |= CAM_SIM_QUEUED;
                err = ctl_queue(io);
                if (err != CTL_RETVAL_COMPLETE) {
                        printf("%s: func %d: error %d returned by "
                               "ctl_queue()!\n", __func__,
                               ccb->ccb_h.func_code, err);
                        ctl_free_io(io);
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        xpt_done(ccb);
                        return;
                }
                break;
        }
        case XPT_ABORT: {
                union ctl_io *io;
                union ccb *abort_ccb;
 
                abort_ccb = ccb->cab.abort_ccb;
 
                if (abort_ccb->ccb_h.func_code != XPT_SCSI_IO) {
                        ccb->ccb_h.status = CAM_REQ_INVALID;
                        xpt_done(ccb);
                }
 
                /*
                 * If we aren't online, there are no devices to talk to.
                 */
                if (softc->online == 0) {
                        ccb->ccb_h.status = CAM_DEV_NOT_THERE;
                        xpt_done(ccb);
                        return;
                }
 
                io = ctl_alloc_io_nowait(softc->port.ctl_pool_ref);
                if (io == NULL) {
                        ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
                        xpt_freeze_devq(ccb->ccb_h.path, 1);
                        xpt_done(ccb);
                        return;
                }
 
                ctl_zero_io(io);
                /* Save pointers on both sides */
                io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = ccb;
                ccb->ccb_h.io_ptr = io;
 
                io->io_hdr.io_type = CTL_IO_TASK;
                io->io_hdr.nexus.initid = 1;
                io->io_hdr.nexus.targ_port = softc->port.targ_port;
                io->io_hdr.nexus.targ_lun = ctl_decode_lun(
                    CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
                io->taskio.task_action = CTL_TASK_ABORT_TASK;
                io->taskio.tag_num = abort_ccb->csio.tag_id;
                switch (abort_ccb->csio.tag_action) {
                case CAM_TAG_ACTION_NONE:
                        io->taskio.tag_type = CTL_TAG_UNTAGGED;
                        break;
                case MSG_SIMPLE_TASK:
                        io->taskio.tag_type = CTL_TAG_SIMPLE;
                        break;
                case MSG_HEAD_OF_QUEUE_TASK:
                        io->taskio.tag_type = CTL_TAG_HEAD_OF_QUEUE;
                        break;
                case MSG_ORDERED_TASK:
                        io->taskio.tag_type = CTL_TAG_ORDERED;
                        break;
                case MSG_ACA_TASK:
                        io->taskio.tag_type = CTL_TAG_ACA;
                        break;
                default:
                        io->taskio.tag_type = CTL_TAG_UNTAGGED;
                        printf("%s: unhandled tag type %#x!!\n", __func__,
                               abort_ccb->csio.tag_action);
                        break;
                }
                err = ctl_queue(io);
                if (err != CTL_RETVAL_COMPLETE) {
                        printf("%s func %d: error %d returned by "
                               "ctl_queue()!\n", __func__,
                               ccb->ccb_h.func_code, err);
                        ctl_free_io(io);
                }
                break;
        }
        case XPT_GET_TRAN_SETTINGS: {
                struct ccb_trans_settings *cts;
                struct ccb_trans_settings_scsi *scsi;
                struct ccb_trans_settings_fc *fc;
 
                cts = &ccb->cts;
                scsi = &cts->proto_specific.scsi;
                fc = &cts->xport_specific.fc;
 
                
                cts->protocol = PROTO_SCSI;
                cts->protocol_version = SCSI_REV_SPC2;
                cts->transport = XPORT_FC;
                cts->transport_version = 0;
 
                scsi->valid = CTS_SCSI_VALID_TQ;
                scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
                fc->valid = CTS_FC_VALID_SPEED;
                fc->bitrate = 800000;
                fc->wwnn = softc->wwnn;
                fc->wwpn = softc->wwpn;
                fc->port = softc->port.targ_port;
                fc->valid |= CTS_FC_VALID_WWNN | CTS_FC_VALID_WWPN |
                        CTS_FC_VALID_PORT; 
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        case XPT_SET_TRAN_SETTINGS:
                /* XXX KDM should we actually do something here? */
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        case XPT_RESET_BUS:
        case XPT_RESET_DEV: {
                union ctl_io *io;
 
                /*
                 * If we aren't online, there are no devices to talk to.
                 */
                if (softc->online == 0) {
                        ccb->ccb_h.status = CAM_DEV_NOT_THERE;
                        xpt_done(ccb);
                        return;
                }
 
                io = ctl_alloc_io_nowait(softc->port.ctl_pool_ref);
                if (io == NULL) {
                        ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
                        xpt_freeze_devq(ccb->ccb_h.path, 1);
                        xpt_done(ccb);
                        return;
                }
 
                ctl_zero_io(io);
                /* Save pointers on both sides */
                if (ccb->ccb_h.func_code == XPT_RESET_DEV)
                        io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = ccb;
                ccb->ccb_h.io_ptr = io;
 
                io->io_hdr.io_type = CTL_IO_TASK;
                io->io_hdr.nexus.initid = 1;
                io->io_hdr.nexus.targ_port = softc->port.targ_port;
                io->io_hdr.nexus.targ_lun = ctl_decode_lun(
                    CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
                if (ccb->ccb_h.func_code == XPT_RESET_BUS)
                        io->taskio.task_action = CTL_TASK_BUS_RESET;
                else
                        io->taskio.task_action = CTL_TASK_LUN_RESET;
 
                err = ctl_queue(io);
                if (err != CTL_RETVAL_COMPLETE) {
                        printf("%s func %d: error %d returned by "
                              "ctl_queue()!\n", __func__,
                              ccb->ccb_h.func_code, err);
                        ctl_free_io(io);
                }
                break;
        }
        case XPT_CALC_GEOMETRY:
                cam_calc_geometry(&ccb->ccg, 1);
                xpt_done(ccb);
                break;
        case XPT_PATH_INQ: {
                struct ccb_pathinq *cpi;
 
                cpi = &ccb->cpi;
 
                cpi->version_num = 0;
                cpi->hba_inquiry = PI_TAG_ABLE;
                cpi->target_sprt = 0;
                cpi->hba_misc = PIM_EXTLUNS;
                cpi->hba_eng_cnt = 0;
                cpi->max_target = 0;
                cpi->max_lun = 1024;
                /* Do we really have a limit? */
                cpi->maxio = 1024 * 1024;
                cpi->async_flags = 0;
                cpi->hpath_id = 0;
                cpi->initiator_id = 1;
 
                strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
                strlcpy(cpi->hba_vid, "FreeBSD", HBA_IDLEN);
                strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
                cpi->unit_number = 0;
                cpi->bus_id = 0;
                cpi->base_transfer_speed = 800000;
                cpi->protocol = PROTO_SCSI;
                cpi->protocol_version = SCSI_REV_SPC2;
                /*
                 * Pretend to be Fibre Channel.
                 */
                cpi->transport = XPORT_FC;
                cpi->transport_version = 0;
                cpi->xport_specific.fc.wwnn = softc->wwnn;
                cpi->xport_specific.fc.wwpn = softc->wwpn;
                cpi->xport_specific.fc.port = softc->port.targ_port;
                cpi->xport_specific.fc.bitrate = 8 * 1000 * 1000;
                cpi->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        default:
                ccb->ccb_h.status = CAM_PROVIDE_FAIL;
                printf("%s: unsupported CCB type %#x\n", __func__,
                       ccb->ccb_h.func_code);
                xpt_done(ccb);
                break;
        }
}