diff options
Diffstat (limited to 'sys/dev/iscsi_initiator/isc_cam.c')
| -rw-r--r-- | sys/dev/iscsi_initiator/isc_cam.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/sys/dev/iscsi_initiator/isc_cam.c b/sys/dev/iscsi_initiator/isc_cam.c new file mode 100644 index 0000000..c3ddd26 --- /dev/null +++ b/sys/dev/iscsi_initiator/isc_cam.c @@ -0,0 +1,384 @@ +/*- + * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il> + * 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. + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. + * + */ +/* + | $Id: isc_cam.c 998 2009-12-20 10:32:45Z danny $ + */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_iscsi_initiator.h" + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/callout.h> +#if __FreeBSD_version >= 700000 +#include <sys/lock.h> +#include <sys/mutex.h> +#endif +#include <sys/conf.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/uio.h> +#include <sys/sysctl.h> +#include <sys/sx.h> + +#include <cam/cam.h> +#include <cam/cam_ccb.h> +#include <cam/cam_sim.h> +#include <cam/cam_xpt_sim.h> +#include <cam/cam_periph.h> + +#include <dev/iscsi_initiator/iscsi.h> +#include <dev/iscsi_initiator/iscsivar.h> + +static void +_inq(struct cam_sim *sim, union ccb *ccb) +{ + struct ccb_pathinq *cpi = &ccb->cpi; + isc_session_t *sp = cam_sim_softc(sim); + + debug_called(8); + debug(3, "sid=%d target=%d lun=%d", sp->sid, ccb->ccb_h.target_id, ccb->ccb_h.target_lun); + + cpi->version_num = 1; /* XXX??? */ + cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32; + cpi->target_sprt = 0; + cpi->hba_misc = 0; + cpi->hba_eng_cnt = 0; + cpi->max_target = 0; //ISCSI_MAX_TARGETS - 1; + cpi->initiator_id = ISCSI_MAX_TARGETS; + cpi->max_lun = sp->opt.maxluns - 1; + cpi->bus_id = cam_sim_bus(sim); + cpi->base_transfer_speed = 3300; // 40000; // XXX: + strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); + strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); + strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); + cpi->unit_number = cam_sim_unit(sim); + cpi->ccb_h.status = CAM_REQ_CMP; +#if defined(KNOB_VALID_ADDRESS) + cpi->transport = XPORT_ISCSI; + cpi->transport_version = 0; +#endif +} + +static __inline int +_scsi_encap(struct cam_sim *sim, union ccb *ccb) +{ + int ret; + +#if __FreeBSD_version < 700000 + ret = scsi_encap(sim, ccb); +#else + isc_session_t *sp = cam_sim_softc(sim); + + mtx_unlock(&sp->cam_mtx); + ret = scsi_encap(sim, ccb); + mtx_lock(&sp->cam_mtx); +#endif + return ret; +} + +void +ic_lost_target(isc_session_t *sp, int target) +{ + debug_called(8); + sdebug(2, "lost target=%d", target); + + if(sp->cam_path != NULL) { + mtx_lock(&sp->cam_mtx); + xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); + xpt_free_path(sp->cam_path); + mtx_unlock(&sp->cam_mtx); + sp->cam_path = 0; // XXX + } +} + +static void +scan_callback(struct cam_periph *periph, union ccb *ccb) +{ + isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0; + + debug_called(8); + + free(ccb, M_TEMP); + + if(sp->flags & ISC_SCANWAIT) { + sp->flags &= ~ISC_SCANWAIT; + wakeup(sp); + } +} + +static int +ic_scan(isc_session_t *sp) +{ + union ccb *ccb; + + debug_called(8); + sdebug(2, "scanning sid=%d", sp->sid); + + if((ccb = malloc(sizeof(union ccb), M_TEMP, M_WAITOK | M_ZERO)) == NULL) { + xdebug("scan failed (can't allocate CCB)"); + return ENOMEM; // XXX + } + + sp->flags &= ~ISC_CAMDEVS; + sp->flags |= ISC_SCANWAIT; + + CAM_LOCK(sp); + if(xpt_create_path(&sp->cam_path, NULL, cam_sim_path(sp->cam_sim), + 0, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { + xdebug("can't create cam path"); + CAM_UNLOCK(sp); + free(ccb, M_TEMP); + return ENODEV; // XXX + } + xpt_setup_ccb(&ccb->ccb_h, sp->cam_path, 5/*priority (low)*/); + ccb->ccb_h.func_code = XPT_SCAN_BUS; + ccb->ccb_h.cbfcnp = scan_callback; + ccb->crcn.flags = CAM_FLAG_NONE; + ccb->ccb_h.spriv_ptr0 = sp; + + xpt_action(ccb); + CAM_UNLOCK(sp); + + while(sp->flags & ISC_SCANWAIT) + tsleep(sp, PRIBIO, "ffp", 5*hz); // the timeout time should + // be configurable + sdebug(2, "# of luns=%d", sp->target_nluns); + + if(sp->target_nluns > 0) { + sp->flags |= ISC_CAMDEVS; + return 0; + } + + return ENODEV; +} + +static void +ic_action(struct cam_sim *sim, union ccb *ccb) +{ + isc_session_t *sp = cam_sim_softc(sim); + struct ccb_hdr *ccb_h = &ccb->ccb_h; + + debug_called(8); + + ccb_h->spriv_ptr0 = sp; + sdebug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%d retry_count=%d timeout=%d", + ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status, + ccb->ccb_h.target_id, ccb->ccb_h.target_lun, + ccb->ccb_h.retry_count, ccb_h->timeout); + if(sp == NULL) { + xdebug("sp == NULL! cannot happen"); + return; + } + switch(ccb_h->func_code) { + case XPT_PATH_INQ: + _inq(sim, ccb); + break; + + case XPT_RESET_BUS: // (can just be a stub that does nothing and completes) + { + struct ccb_pathinq *cpi = &ccb->cpi; + + debug(3, "XPT_RESET_BUS"); + cpi->ccb_h.status = CAM_REQ_CMP; + break; + } + + case XPT_SCSI_IO: + { + struct ccb_scsiio* csio = &ccb->csio; + + debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]); + if(sp == NULL) { + ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS; + debug(4, "xpt_done.status=%d", ccb_h->status); + break; + } + if(ccb_h->target_lun == CAM_LUN_WILDCARD) { + debug(3, "target=%d: bad lun (-1)", ccb_h->target_id); + ccb_h->status = CAM_LUN_INVALID; + break; + } + if(_scsi_encap(sim, ccb) != 0) + return; + break; + } + + case XPT_CALC_GEOMETRY: + { + struct ccb_calc_geometry *ccg; + + ccg = &ccb->ccg; + debug(4, "sid=%d target=%d lun=%d XPT_CALC_GEOMETRY vsize=%jd bsize=%d", + sp->sid, ccb->ccb_h.target_id, ccb->ccb_h.target_lun, + ccg->volume_size, ccg->block_size); + if(ccg->block_size == 0 || + (ccg->volume_size < ccg->block_size)) { + // print error message ... + /* XXX: what error is appropiate? */ + break; + } + else { + int lun, *off, boff; + + lun = ccb->ccb_h.target_lun; + if(lun > ISCSI_MAX_LUNS) { + // XXX: + xdebug("lun %d > ISCSI_MAX_LUNS!\n", lun); + lun %= ISCSI_MAX_LUNS; + } + off = &sp->target_lun[lun / (sizeof(int)*8)]; + boff = BIT(lun % (sizeof(int)*8)); + debug(4, "sp->target_nluns=%d *off=%x boff=%x", + sp->target_nluns, *off, boff); + + if((*off & boff) == 0) { + sp->target_nluns++; + *off |= boff; + } + cam_calc_geometry(ccg, /*extended*/1); + } + break; + } + + case XPT_GET_TRAN_SETTINGS: + default: + ccb_h->status = CAM_REQ_INVALID; + break; + } +#if __FreeBSD_version < 700000 + XPT_DONE(sp, ccb); +#else + xpt_done(ccb); +#endif + return; +} + +static void +ic_poll(struct cam_sim *sim) +{ + debug_called(4); + +} + +int +ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp) +{ + debug_called(8); + + if(sp && sp->cam_sim) { + cp->path_id = cam_sim_path(sp->cam_sim); + cp->target_id = 0; + cp->target_nluns = ISCSI_MAX_LUNS; // XXX: -1? + return 0; + } + return ENXIO; +} + +void +ic_destroy(isc_session_t *sp ) +{ + debug_called(8); + + if(sp->cam_path != NULL) { + sdebug(2, "name=%s unit=%d", + cam_sim_name(sp->cam_sim), cam_sim_unit(sp->cam_sim)); + CAM_LOCK(sp); +#if 0 + xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); +#else + xpt_async(XPT_RESET_BUS, sp->cam_path, NULL); +#endif + xpt_free_path(sp->cam_path); + xpt_bus_deregister(cam_sim_path(sp->cam_sim)); + cam_sim_free(sp->cam_sim, TRUE /*free_devq*/); + + CAM_UNLOCK(sp); + sdebug(2, "done"); + } +} + +int +ic_init(isc_session_t *sp) +{ + struct cam_sim *sim; + struct cam_devq *devq; + + debug_called(8); + + if((devq = cam_simq_alloc(256)) == NULL) + return ENOMEM; + +#if __FreeBSD_version >= 700000 + mtx_init(&sp->cam_mtx, "isc-cam", NULL, MTX_DEF); +#else + isp->cam_mtx = Giant; +#endif + sim = cam_sim_alloc(ic_action, + ic_poll, + "iscsi", + sp, + sp->sid, // unit +#if __FreeBSD_version >= 700000 + &sp->cam_mtx, +#endif + 1, // max_dev_transactions + 0, // max_tagged_dev_transactions + devq); + if(sim == NULL) { + cam_simq_free(devq); +#if __FreeBSD_version >= 700000 + mtx_destroy(&sp->cam_mtx); +#endif + return ENXIO; + } + + CAM_LOCK(sp); + if(xpt_bus_register(sim, +#if __FreeBSD_version >= 700000 + NULL, +#endif + 0/*bus_number*/) != CAM_SUCCESS) { + + cam_sim_free(sim, /*free_devq*/TRUE); + CAM_UNLOCK(sp); +#if __FreeBSD_version >= 700000 + mtx_destroy(&sp->cam_mtx); +#endif + return ENXIO; + } + sp->cam_sim = sim; + CAM_UNLOCK(sp); + + sdebug(1, "cam subsystem initialized"); + + ic_scan(sp); + + return 0; +} |
