/* * SCSI Primary Commands (SPC) parsing and emulation. * * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. * Copyright (c) 2005, 2006, 2007 SBE, Inc. * Copyright (c) 2007-2010 Rising Tide Systems * Copyright (c) 2008-2010 Linux-iSCSI.org * * Nicholas A. Bellinger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include #include #include #include "target_core_internal.h" #include "target_core_alua.h" #include "target_core_pr.h" #include "target_core_ua.h" static void spc_fill_alua_data(struct se_port *port, unsigned char *buf) { struct t10_alua_tg_pt_gp *tg_pt_gp; struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; /* * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. */ buf[5] = 0x80; /* * Set TPGS field for explict and/or implict ALUA access type * and opteration. * * See spc4r17 section 6.4.2 Table 135 */ if (!port) return; tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; if (!tg_pt_gp_mem) return; spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; if (tg_pt_gp) buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); } static int spc_emulate_inquiry_std(struct se_cmd *cmd, char *buf) { struct se_lun *lun = cmd->se_lun; struct se_device *dev = cmd->se_dev; /* Set RMB (removable media) for tape devices */ if (dev->transport->get_device_type(dev) == TYPE_TAPE) buf[1] = 0x80; buf[2] = dev->transport->get_device_rev(dev); /* * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2 * * SPC4 says: * A RESPONSE DATA FORMAT field set to 2h indicates that the * standard INQUIRY data is in the format defined in this * standard. Response data format values less than 2h are * obsolete. Response data format values greater than 2h are * reserved. */ buf[3] = 2; /* * Enable SCCS and TPGS fields for Emulated ALUA */ if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) spc_fill_alua_data(lun->lun_sep, buf); buf[7] = 0x2; /* CmdQue=1 */ snprintf(&buf[8], 8, "LIO-ORG"); snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model); snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision); buf[4] = 31; /* Set additional length to 31 */ return 0; } /* unit serial number */ static int spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; u16 len = 0; if (dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL) { u32 unit_serial_len; unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial); unit_serial_len++; /* For NULL Terminator */ len += sprintf(&buf[4], "%s", dev->se_sub_dev->t10_wwn.unit_serial); len++; /* Extra Byte for NULL Terminator */ buf[3] = len; } return 0; } static void spc_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf) { unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0]; int cnt; bool next = true; /* * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure * per device uniqeness. */ for (cnt = 0; *p && cnt < 13; p++) { int val = hex_to_bin(*p); if (val < 0) continue; if (next) { next = false; buf[cnt++] |= val; } else { next = true; buf[cnt] = val << 4; } } } /* * Device identification VPD, for a complete list of * DESIGNATOR TYPEs see spc4r17 Table 459. */ static int spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; struct se_lun *lun = cmd->se_lun; struct se_port *port = NULL; struct se_portal_group *tpg = NULL; struct t10_alua_lu_gp_member *lu_gp_mem; struct t10_alua_tg_pt_gp *tg_pt_gp; struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0]; u32 prod_len; u32 unit_serial_len, off = 0; u16 len = 0, id_len; off = 4; /* * NAA IEEE Registered Extended Assigned designator format, see * spc4r17 section 7.7.3.6.5 * * We depend upon a target_core_mod/ConfigFS provided * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial * value in order to return the NAA id. */ if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL)) goto check_t10_vend_desc; /* CODE SET == Binary */ buf[off++] = 0x1; /* Set ASSOCIATION == addressed logical unit: 0)b */ buf[off] = 0x00; /* Identifier/Designator type == NAA identifier */ buf[off++] |= 0x3; off++; /* Identifier/Designator length */ buf[off++] = 0x10; /* * Start NAA IEEE Registered Extended Identifier/Designator */ buf[off++] = (0x6 << 4); /* * Use OpenFabrics IEEE Company ID: 00 14 05 */ buf[off++] = 0x01; buf[off++] = 0x40; buf[off] = (0x5 << 4); /* * Return ConfigFS Unit Serial Number information for * VENDOR_SPECIFIC_IDENTIFIER and * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION */ spc_parse_naa_6h_vendor_specific(dev, &buf[off]); len = 20; off = (len + 4); check_t10_vend_desc: /* * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 */ id_len = 8; /* For Vendor field */ prod_len = 4; /* For VPD Header */ prod_len += 8; /* For Vendor field */ prod_len += strlen(prod); prod_len++; /* For : */ if (dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL) { unit_serial_len = strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]); unit_serial_len++; /* For NULL Terminator */ id_len += sprintf(&buf[off+12], "%s:%s", prod, &dev->se_sub_dev->t10_wwn.unit_serial[0]); } buf[off] = 0x2; /* ASCII */ buf[off+1] = 0x1; /* T10 Vendor ID */ buf[off+2] = 0x0; memcpy(&buf[off+4], "LIO-ORG", 8); /* Extra Byte for NULL Terminator */ id_len++; /* Identifier Length */ buf[off+3] = id_len; /* Header size for Designation descriptor */ len += (id_len + 4); off += (id_len + 4); /* * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD */ port = lun->lun_sep; if (port) { struct t10_alua_lu_gp *lu_gp; u32 padding, scsi_name_len; u16 lu_gp_id = 0; u16 tg_pt_gp_id = 0; u16 tpgt; tpg = port->sep_tpg; /* * Relative target port identifer, see spc4r17 * section 7.7.3.7 * * Get the PROTOCOL IDENTIFIER as defined by spc4r17 * section 7.5.1 Table 362 */ buf[off] = (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4); buf[off++] |= 0x1; /* CODE SET == Binary */ buf[off] = 0x80; /* Set PIV=1 */ /* Set ASSOCIATION == target port: 01b */ buf[off] |= 0x10; /* DESIGNATOR TYPE == Relative target port identifer */ buf[off++] |= 0x4; off++; /* Skip over Reserved */ buf[off++] = 4; /* DESIGNATOR LENGTH */ /* Skip over Obsolete field in RTPI payload * in Table 472 */ off += 2; buf[off++] = ((port->sep_rtpi >> 8) & 0xff); buf[off++] = (port->sep_rtpi & 0xff); len += 8; /* Header size + Designation descriptor */ /* * Target port group identifier, see spc4r17 * section 7.7.3.8 * * Get the PROTOCOL IDENTIFIER as defined by spc4r17 * section 7.5.1 Table 362 */ if (dev->se_sub_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) goto check_scsi_name; tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; if (!tg_pt_gp_mem) goto check_lu_gp; spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; if (!tg_pt_gp) { spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); goto check_lu_gp; } tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); buf[off] = (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4); buf[off++] |= 0x1; /* CODE SET == Binary */ buf[off] = 0x80; /* Set PIV=1 */ /* Set ASSOCIATION == target port: 01b */ buf[off] |= 0x10; /* DESIGNATOR TYPE == Target port group identifier */ buf[off++] |= 0x5; off++; /* Skip over Reserved */ buf[off++] = 4; /* DESIGNATOR LENGTH */ off += 2; /* Skip over Reserved Field */ buf[off++] = ((tg_pt_gp_id >> 8) & 0xff); buf[off++] = (tg_pt_gp_id & 0xff); len += 8; /* Header size + Designation descriptor */ /* * Logical Unit Group identifier, see spc4r17 * section 7.7.3.8 */ check_lu_gp: lu_gp_mem = dev->dev_alua_lu_gp_mem; if (!lu_gp_mem) goto check_scsi_name; spin_lock(&lu_gp_mem->lu_gp_mem_lock); lu_gp = lu_gp_mem->lu_gp; if (!lu_gp) { spin_unlock(&lu_gp_mem->lu_gp_mem_lock); goto check_scsi_name; } lu_gp_id = lu_gp->lu_gp_id; spin_unlock(&lu_gp_mem->lu_gp_mem_lock); buf[off++] |= 0x1; /* CODE SET == Binary */ /* DESIGNATOR TYPE == Logical Unit Group identifier */ buf[off++] |= 0x6; off++; /* Skip over Reserved */ buf[off++] = 4; /* DESIGNATOR LENGTH */ off += 2; /* Skip over Reserved Field */ buf[off++] = ((lu_gp_id >> 8) & 0xff); buf[off++] = (lu_gp_id & 0xff); len += 8; /* Header size + Designation descriptor */ /* * SCSI name string designator, see spc4r17 * section 7.7.3.11 * * Get the PROTOCOL IDENTIFIER as defined by spc4r17 * section 7.5.1 Table 362 */ check_scsi_name: scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg)); /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */ scsi_name_len += 10; /* Check for 4-byte padding */ padding = ((-scsi_name_len) & 3); if (padding != 0) scsi_name_len += padding; /* Header size + Designation descriptor */ scsi_name_len += 4; buf[off] = (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4); buf[off++] |= 0x3; /* CODE SET == UTF-8 */ buf[off] = 0x80; /* Set PIV=1 */ /* Set ASSOCIATION == target port: 01b */ buf[off] |= 0x10; /* DESIGNATOR TYPE == SCSI name string */ buf[off++] |= 0x8; off += 2; /* Skip over Reserved and length */ /* * SCSI name string identifer containing, $FABRIC_MOD * dependent information. For LIO-Target and iSCSI * Target Port, this means ",t,0x in * UTF-8 encoding. */ tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); scsi_name_len += 1 /* Include NULL terminator */; /* * The null-terminated, null-padded (see 4.4.2) SCSI * NAME STRING field contains a UTF-8 format string. * The number of bytes in the SCSI NAME STRING field * (i.e., the value in the DESIGNATOR LENGTH field) * shall be no larger than 256 and shall be a multiple * of four. */ if (padding) scsi_name_len += padding; buf[off-1] = scsi_name_len; off += scsi_name_len; /* Header size + Designation descriptor */ len += (scsi_name_len + 4); } buf[2] = ((len >> 8) & 0xff); buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */ return 0; } /* Extended INQUIRY Data VPD Page */ static int spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) { buf[3] = 0x3c; /* Set HEADSUP, ORDSUP, SIMPSUP */ buf[5] = 0x07; /* If WriteCache emulation is enabled, set V_SUP */ if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) buf[6] = 0x01; return 0; } /* Block Limits VPD page */ static int spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; u32 max_sectors; int have_tp = 0; /* * Following spc3r22 section 6.5.3 Block Limits VPD page, when * emulate_tpu=1 or emulate_tpws=1 we will be expect a * different page length for Thin Provisioning. */ if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) have_tp = 1; buf[0] = dev->transport->get_device_type(dev); buf[3] = have_tp ? 0x3c : 0x10; /* Set WSNZ to 1 */ buf[4] = 0x01; /* * Set OPTIMAL TRANSFER LENGTH GRANULARITY */ put_unaligned_be16(1, &buf[6]); /* * Set MAXIMUM TRANSFER LENGTH */ max_sectors = min(dev->se_sub_dev->se_dev_attrib.fabric_max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors); put_unaligned_be32(max_sectors, &buf[8]); /* * Set OPTIMAL TRANSFER LENGTH */ put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]); /* * Exit now if we don't support TP. */ if (!have_tp) return 0; /* * Set MAXIMUM UNMAP LBA COUNT */ put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]); /* * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT */ put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count, &buf[24]); /* * Set OPTIMAL UNMAP GRANULARITY */ put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]); /* * UNMAP GRANULARITY ALIGNMENT */ put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment, &buf[32]); if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0) buf[32] |= 0x80; /* Set the UGAVALID bit */ return 0; } /* Block Device Characteristics VPD page */ static int spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; buf[0] = dev->transport->get_device_type(dev); buf[3] = 0x3c; buf[5] = dev->se_sub_dev->se_dev_attrib.is_nonrot ? 1 : 0; return 0; } /* Thin Provisioning VPD */ static int spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; /* * From spc3r22 section 6.5.4 Thin Provisioning VPD page: * * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to * zero, then the page length shall be set to 0004h. If the DP bit * is set to one, then the page length shall be set to the value * defined in table 162. */ buf[0] = dev->transport->get_device_type(dev); /* * Set Hardcoded length mentioned above for DP=0 */ put_unaligned_be16(0x0004, &buf[2]); /* * The THRESHOLD EXPONENT field indicates the threshold set size in * LBAs as a power of 2 (i.e., the threshold set size is equal to * 2(threshold exponent)). * * Note that this is currently set to 0x00 as mkp says it will be * changing again. We can enable this once it has settled in T10 * and is actually used by Linux/SCSI ML code. */ buf[4] = 0x00; /* * A TPU bit set to one indicates that the device server supports * the UNMAP command (see 5.25). A TPU bit set to zero indicates * that the device server does not support the UNMAP command. */ if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0) buf[5] = 0x80; /* * A TPWS bit set to one indicates that the device server supports * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. * A TPWS bit set to zero indicates that the device server does not * support the use of the WRITE SAME (16) command to unmap LBAs. */ if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0) buf[5] |= 0x40; return 0; } static int spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); static struct { uint8_t page; int (*emulate)(struct se_cmd *, unsigned char *); } evpd_handlers[] = { { .page = 0x00, .emulate = spc_emulate_evpd_00 }, { .page = 0x80, .emulate = spc_emulate_evpd_80 }, { .page = 0x83, .emulate = spc_emulate_evpd_83 }, { .page = 0x86, .emulate = spc_emulate_evpd_86 }, { .page = 0xb0, .emulate = spc_emulate_evpd_b0 }, { .page = 0xb1, .emulate = spc_emulate_evpd_b1 }, { .page = 0xb2, .emulate = spc_emulate_evpd_b2 }, }; /* supported vital product data pages */ static int spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) { int p; /* * Only report the INQUIRY EVPD=1 pages after a valid NAA * Registered Extended LUN WWN has been set via ConfigFS * during device creation/restart. */ if (cmd->se_dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL) { buf[3] = ARRAY_SIZE(evpd_handlers); for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) buf[p + 4] = evpd_handlers[p].page; } return 0; } static int spc_emulate_inquiry(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg; unsigned char *rbuf; unsigned char *cdb = cmd->t_task_cdb; unsigned char buf[SE_INQUIRY_BUF]; int p, ret; if (dev == tpg->tpg_virt_lun0.lun_se_dev) buf[0] = 0x3f; /* Not connected */ else buf[0] = dev->transport->get_device_type(dev); if (!(cdb[1] & 0x1)) { if (cdb[2]) { pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", cdb[2]); cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; ret = -EINVAL; goto out; } ret = spc_emulate_inquiry_std(cmd, buf); goto out; } for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { if (cdb[2] == evpd_handlers[p].page) { buf[1] = cdb[2]; ret = evpd_handlers[p].emulate(cmd, buf); goto out; } } pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; ret = -EINVAL; out: rbuf = transport_kmap_data_sg(cmd); if (rbuf) { memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); transport_kunmap_data_sg(cmd); } if (!ret) target_complete_cmd(cmd, GOOD); return ret; } static int spc_modesense_rwrecovery(unsigned char *p) { p[0] = 0x01; p[1] = 0x0a; return 12; } static int spc_modesense_control(struct se_device *dev, unsigned char *p) { p[0] = 0x0a; p[1] = 0x0a; p[2] = 2; /* * From spc4r23, 7.4.7 Control mode page * * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies * restrictions on the algorithm used for reordering commands * having the SIMPLE task attribute (see SAM-4). * * Table 368 -- QUEUE ALGORITHM MODIFIER field * Code Description * 0h Restricted reordering * 1h Unrestricted reordering allowed * 2h to 7h Reserved * 8h to Fh Vendor specific * * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that * the device server shall order the processing sequence of commands * having the SIMPLE task attribute such that data integrity is maintained * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol * requests is halted at any time, the final value of all data observable * on the medium shall be the same as if all the commands had been processed * with the ORDERED task attribute). * * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the * device server may reorder the processing sequence of commands having the * SIMPLE task attribute in any manner. Any data integrity exposures related to * command sequence order shall be explicitly handled by the application client * through the selection of appropriate ommands and task attributes. */ p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; /* * From spc4r17, section 7.4.6 Control mode Page * * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b * * 00b: The logical unit shall clear any unit attention condition * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION * status and shall not establish a unit attention condition when a com- * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT * status. * * 10b: The logical unit shall not clear any unit attention condition * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION * status and shall not establish a unit attention condition when * a command is completed with BUSY, TASK SET FULL, or RESERVATION * CONFLICT status. * * 11b a The logical unit shall not clear any unit attention condition * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION * status and shall establish a unit attention condition for the * initiator port associated with the I_T nexus on which the BUSY, * TASK SET FULL, or RESERVATION CONFLICT status is being returned. * Depending on the status, the additional sense code shall be set to * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE * command, a unit attention condition shall be established only once * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless * to the number of commands completed with one of those status codes. */ p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 : (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00; /* * From spc4r17, section 7.4.6 Control mode Page * * Task Aborted Status (TAS) bit set to zero. * * A task aborted status (TAS) bit set to zero specifies that aborted * tasks shall be terminated by the device server without any response * to the application client. A TAS bit set to one specifies that tasks * aborted by the actions of an I_T nexus other than the I_T nexus on * which the command was received shall be completed with TASK ABORTED * status (see SAM-4). */ p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00; p[8] = 0xff; p[9] = 0xff; p[11] = 30; return 12; } static int spc_modesense_caching(struct se_device *dev, unsigned char *p) { p[0] = 0x08; p[1] = 0x12; if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) p[2] = 0x04; /* Write Cache Enable */ p[12] = 0x20; /* Disabled Read Ahead */ return 20; } static void spc_modesense_write_protect(unsigned char *buf, int type) { /* * I believe that the WP bit (bit 7) in the mode header is the same for * all device types.. */ switch (type) { case TYPE_DISK: case TYPE_TAPE: default: buf[0] |= 0x80; /* WP bit */ break; } } static void spc_modesense_dpofua(unsigned char *buf, int type) { switch (type) { case TYPE_DISK: buf[0] |= 0x10; /* DPOFUA bit */ break; default: break; } } static int spc_emulate_modesense(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; char *cdb = cmd->t_task_cdb; unsigned char *rbuf; int type = dev->transport->get_device_type(dev); int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); int offset = ten ? 8 : 4; int length = 0; unsigned char buf[SE_MODE_PAGE_BUF]; memset(buf, 0, SE_MODE_PAGE_BUF); switch (cdb[2] & 0x3f) { case 0x01: length = spc_modesense_rwrecovery(&buf[offset]); break; case 0x08: length = spc_modesense_caching(dev, &buf[offset]); break; case 0x0a: length = spc_modesense_control(dev, &buf[offset]); break; case 0x3f: length = spc_modesense_rwrecovery(&buf[offset]); length += spc_modesense_caching(dev, &buf[offset+length]); length += spc_modesense_control(dev, &buf[offset+length]); break; default: pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", cdb[2] & 0x3f, cdb[3]); cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE; return -EINVAL; } offset += length; if (ten) { offset -= 2; buf[0] = (offset >> 8) & 0xff; buf[1] = offset & 0xff; if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) || (cmd->se_deve && (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY))) spc_modesense_write_protect(&buf[3], type); if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) && (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0)) spc_modesense_dpofua(&buf[3], type); if ((offset + 2) > cmd->data_length) offset = cmd->data_length; } else { offset -= 1; buf[0] = offset & 0xff; if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) || (cmd->se_deve && (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY))) spc_modesense_write_protect(&buf[2], type); if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) && (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0)) spc_modesense_dpofua(&buf[2], type); if ((offset + 1) > cmd->data_length) offset = cmd->data_length; } rbuf = transport_kmap_data_sg(cmd); memcpy(rbuf, buf, offset); transport_kunmap_data_sg(cmd); target_complete_cmd(cmd, GOOD); return 0; } static int spc_emulate_request_sense(struct se_cmd *cmd) { unsigned char *cdb = cmd->t_task_cdb; unsigned char *rbuf; u8 ua_asc = 0, ua_ascq = 0; unsigned char buf[SE_SENSE_BUF]; memset(buf, 0, SE_SENSE_BUF); if (cdb[1] & 0x01) { pr_err("REQUEST_SENSE description emulation not" " supported\n"); cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; return -ENOSYS; } rbuf = transport_kmap_data_sg(cmd); if (cmd->scsi_sense_reason != 0) { /* * Out of memory. We will fail with CHECK CONDITION, so * we must not clear the unit attention condition. */ target_complete_cmd(cmd, CHECK_CONDITION); return 0; } else if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) { /* * CURRENT ERROR, UNIT ATTENTION */ buf[0] = 0x70; buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; /* * The Additional Sense Code (ASC) from the UNIT ATTENTION */ buf[SPC_ASC_KEY_OFFSET] = ua_asc; buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq; buf[7] = 0x0A; } else { /* * CURRENT ERROR, NO SENSE */ buf[0] = 0x70; buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE; /* * NO ADDITIONAL SENSE INFORMATION */ buf[SPC_ASC_KEY_OFFSET] = 0x00; buf[7] = 0x0A; } if (rbuf) { memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); transport_kunmap_data_sg(cmd); } target_complete_cmd(cmd, GOOD); return 0; } static int spc_emulate_testunitready(struct se_cmd *cmd) { target_complete_cmd(cmd, GOOD); return 0; } int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) { struct se_device *dev = cmd->se_dev; struct se_subsystem_dev *su_dev = dev->se_sub_dev; unsigned char *cdb = cmd->t_task_cdb; switch (cdb[0]) { case MODE_SELECT: *size = cdb[4]; break; case MODE_SELECT_10: *size = (cdb[7] << 8) + cdb[8]; break; case MODE_SENSE: *size = cdb[4]; cmd->execute_cmd = spc_emulate_modesense; break; case MODE_SENSE_10: *size = (cdb[7] << 8) + cdb[8]; cmd->execute_cmd = spc_emulate_modesense; break; case LOG_SELECT: case LOG_SENSE: *size = (cdb[7] << 8) + cdb[8]; break; case PERSISTENT_RESERVE_IN: if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) cmd->execute_cmd = target_scsi3_emulate_pr_in; *size = (cdb[7] << 8) + cdb[8]; break; case PERSISTENT_RESERVE_OUT: if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) cmd->execute_cmd = target_scsi3_emulate_pr_out; *size = (cdb[7] << 8) + cdb[8]; break; case RELEASE: case RELEASE_10: if (cdb[0] == RELEASE_10) *size = (cdb[7] << 8) | cdb[8]; else *size = cmd->data_length; if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) cmd->execute_cmd = target_scsi2_reservation_release; break; case RESERVE: case RESERVE_10: /* * The SPC-2 RESERVE does not contain a size in the SCSI CDB. * Assume the passthrough or $FABRIC_MOD will tell us about it. */ if (cdb[0] == RESERVE_10) *size = (cdb[7] << 8) | cdb[8]; else *size = cmd->data_length; /* * Setup the legacy emulated handler for SPC-2 and * >= SPC-3 compatible reservation handling (CRH=1) * Otherwise, we assume the underlying SCSI logic is * is running in SPC_PASSTHROUGH, and wants reservations * emulation disabled. */ if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) cmd->execute_cmd = target_scsi2_reservation_reserve; break; case REQUEST_SENSE: *size = cdb[4]; cmd->execute_cmd = spc_emulate_request_sense; break; case INQUIRY: *size = (cdb[3] << 8) + cdb[4]; /* * Do implict HEAD_OF_QUEUE processing for INQUIRY. * See spc4r17 section 5.3 */ if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) cmd->sam_task_attr = MSG_HEAD_TAG; cmd->execute_cmd = spc_emulate_inquiry; break; case SECURITY_PROTOCOL_IN: case SECURITY_PROTOCOL_OUT: *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; break; case EXTENDED_COPY: case READ_ATTRIBUTE: case RECEIVE_COPY_RESULTS: case WRITE_ATTRIBUTE: *size = (cdb[10] << 24) | (cdb[11] << 16) | (cdb[12] << 8) | cdb[13]; break; case RECEIVE_DIAGNOSTIC: case SEND_DIAGNOSTIC: *size = (cdb[3] << 8) | cdb[4]; break; case WRITE_BUFFER: *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; break; case REPORT_LUNS: cmd->execute_cmd = target_report_luns; *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; /* * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS * See spc4r17 section 5.3 */ if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) cmd->sam_task_attr = MSG_HEAD_TAG; break; case TEST_UNIT_READY: cmd->execute_cmd = spc_emulate_testunitready; *size = 0; break; case MAINTENANCE_IN: if (dev->transport->get_device_type(dev) != TYPE_ROM) { /* * MAINTENANCE_IN from SCC-2 * Check for emulated MI_REPORT_TARGET_PGS */ if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS && su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { cmd->execute_cmd = target_emulate_report_target_port_groups; } *size = get_unaligned_be32(&cdb[6]); } else { /* * GPCMD_SEND_KEY from multi media commands */ *size = get_unaligned_be16(&cdb[8]); } break; case MAINTENANCE_OUT: if (dev->transport->get_device_type(dev) != TYPE_ROM) { /* * MAINTENANCE_OUT from SCC-2 * Check for emulated MO_SET_TARGET_PGS. */ if (cdb[1] == MO_SET_TARGET_PGS && su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) { cmd->execute_cmd = target_emulate_set_target_port_groups; } *size = get_unaligned_be32(&cdb[6]); } else { /* * GPCMD_SEND_KEY from multi media commands */ *size = get_unaligned_be16(&cdb[8]); } break; default: pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" " 0x%02x, sending CHECK_CONDITION.\n", cmd->se_tfo->get_fabric_name(), cdb[0]); cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; return -EINVAL; } return 0; } EXPORT_SYMBOL(spc_parse_cdb);