/* $OpenBSD: mpath_emc.c,v 1.20 2014/09/14 14:17:26 jsg Exp $ */ /* * Copyright (c) 2011 David Gwynne * * 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. */ /* EMC CLARiiON AX/CX support for mpath(4) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define EMC_VPD_SP_INFO 0xc0 struct emc_vpd_sp_info { struct scsi_vpd_hdr hdr; /* EMC_VPD_SP_INFO */ u_int8_t lun_state; #define EMC_SP_INFO_LUN_STATE_UNBOUND 0x00 #define EMC_SP_INFO_LUN_STATE_BOUND 0x01 #define EMC_SP_INFO_LUN_STATE_OWNED 0x02 u_int8_t default_sp; u_int8_t _reserved1[1]; u_int8_t port; u_int8_t current_sp; u_int8_t _reserved2[1]; u_int8_t unique_id[16]; u_int8_t _reserved3[1]; u_int8_t type; u_int8_t failover_mode; u_int8_t _reserved4[21]; u_int8_t serial[16]; } __packed; struct emc_softc { struct device sc_dev; struct mpath_path sc_path; struct scsi_xshandler sc_xsh; struct emc_vpd_sp_info *sc_pg; }; #define DEVNAME(_s) ((_s)->sc_dev.dv_xname) int emc_match(struct device *, void *, void *); void emc_attach(struct device *, struct device *, void *); int emc_detach(struct device *, int); int emc_activate(struct device *, int); struct cfattach emc_ca = { sizeof(struct emc_softc), emc_match, emc_attach, emc_detach, emc_activate }; struct cfdriver emc_cd = { NULL, "emc", DV_DULL }; void emc_mpath_start(struct scsi_xfer *); int emc_mpath_checksense(struct scsi_xfer *); void emc_mpath_status(struct scsi_link *); const struct mpath_ops emc_mpath_ops = { "emc", emc_mpath_checksense, emc_mpath_status }; struct emc_device { char *vendor; char *product; }; void emc_status(struct scsi_xfer *); void emc_status_done(struct scsi_xfer *); int emc_sp_info(struct emc_softc *, int *); struct emc_device emc_devices[] = { /* " vendor " " device " */ /* "01234567" "0123456789012345" */ { "DGC ", "RAID" }, { "DGC ", "DISK" }, { "DGC ", "VRAID" } }; int emc_match(struct device *parent, void *match, void *aux) { struct scsi_attach_args *sa = aux; struct scsi_inquiry_data *inq = sa->sa_inqbuf; struct emc_device *s; int i; if (mpath_path_probe(sa->sa_sc_link) != 0) return (0); for (i = 0; i < nitems(emc_devices); i++) { s = &emc_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 emc_attach(struct device *parent, struct device *self, void *aux) { struct emc_softc *sc = (struct emc_softc *)self; struct scsi_attach_args *sa = aux; struct scsi_link *link = sa->sa_sc_link; int sp; printf("\n"); /* init link */ link->device_softc = sc; /* init path */ scsi_xsh_set(&sc->sc_path.p_xsh, link, emc_mpath_start); sc->sc_path.p_link = link; /* init status handler */ scsi_xsh_set(&sc->sc_xsh, link, emc_status); sc->sc_pg = dma_alloc(sizeof(*sc->sc_pg), PR_WAITOK); /* let's go */ if (emc_sp_info(sc, &sp)) { printf("%s: unable to get sp info\n", DEVNAME(sc)); return; } if (mpath_path_attach(&sc->sc_path, sp, &emc_mpath_ops) != 0) printf("%s: unable to attach path\n", DEVNAME(sc)); } int emc_detach(struct device *self, int flags) { struct emc_softc *sc = (struct emc_softc *)self; dma_free(sc->sc_pg, sizeof(*sc->sc_pg)); return (0); } int emc_activate(struct device *self, int act) { struct emc_softc *sc = (struct emc_softc *)self; int rv = 0; switch (act) { case DVACT_DEACTIVATE: if (sc->sc_path.p_group != NULL) mpath_path_detach(&sc->sc_path); break; } return (rv); } void emc_mpath_start(struct scsi_xfer *xs) { struct emc_softc *sc = xs->sc_link->device_softc; mpath_start(&sc->sc_path, xs); } int emc_mpath_checksense(struct scsi_xfer *xs) { struct scsi_sense_data *sense = &xs->sense; if ((sense->error_code & SSD_ERRCODE) == SSD_ERRCODE_CURRENT && (sense->flags & SSD_KEY) == SKEY_NOT_READY && ASC_ASCQ(sense) == 0x0403) { /* Logical Unit Not Ready, Manual Intervention Required */ return (MPATH_SENSE_FAILOVER); } return (MPATH_SENSE_DECLINED); } void emc_mpath_status(struct scsi_link *link) { struct emc_softc *sc = link->device_softc; scsi_xsh_add(&sc->sc_xsh); } void emc_status(struct scsi_xfer *xs) { struct scsi_link *link = xs->sc_link; struct emc_softc *sc = link->device_softc; scsi_init_inquiry(xs, SI_EVPD, EMC_VPD_SP_INFO, sc->sc_pg, sizeof(*sc->sc_pg)); xs->done = emc_status_done; scsi_xs_exec(xs); } void emc_status_done(struct scsi_xfer *xs) { struct scsi_link *link = xs->sc_link; struct emc_softc *sc = link->device_softc; struct emc_vpd_sp_info *pg = sc->sc_pg; int status = MPATH_S_UNKNOWN; if (xs->error == XS_NOERROR) { status = (pg->lun_state == EMC_SP_INFO_LUN_STATE_OWNED) ? MPATH_S_ACTIVE : MPATH_S_PASSIVE; } scsi_xs_put(xs); mpath_path_status(&sc->sc_path, status); } int emc_sp_info(struct emc_softc *sc, int *sp) { struct emc_vpd_sp_info *pg = sc->sc_pg; int error; error = scsi_inquire_vpd(sc->sc_path.p_link, pg, sizeof(*pg), EMC_VPD_SP_INFO, scsi_autoconf); if (error != 0) return (error); *sp = pg->current_sp; printf("%s: SP-%c port %d\n", DEVNAME(sc), pg->current_sp + 'A', pg->port); return (0); }