/* * SCSI Primary Commands (SPC) parsing and emulation. * * (c) Copyright 2002-2013 Datera, Inc. * * 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" #include "target_core_xcopy.h" static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf) { struct t10_alua_tg_pt_gp *tg_pt_gp; /* * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. */ buf[5] = 0x80; /* * Set TPGS field for explicit and/or implicit ALUA access type * and opteration. * * See spc4r17 section 6.4.2 Table 135 */ spin_lock(&lun->lun_tg_pt_gp_lock); tg_pt_gp = lun->lun_tg_pt_gp; if (tg_pt_gp) buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; spin_unlock(&lun->lun_tg_pt_gp_lock); } sense_reason_t spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) { struct se_lun *lun = cmd->se_lun; struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; /* Set RMB (removable media) for tape devices */ if (dev->transport->get_device_type(dev) == TYPE_TAPE) buf[1] = 0x80; buf[2] = 0x05; /* SPC-3 */ /* * 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 */ spc_fill_alua_data(lun, buf); /* * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY */ if (dev->dev_attrib.emulate_3pc) buf[5] |= 0x8; /* * Set Protection (PROTECT) bit when DIF has been enabled on the * device, and the fabric supports VERIFY + PASS. Also report * PROTECT=1 if sess_prot_type has been configured to allow T10-PI * to unprotected devices. */ if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type) buf[5] |= 0x1; } buf[7] = 0x2; /* CmdQue=1 */ memcpy(&buf[8], "LIO-ORG ", 8); memset(&buf[16], 0x20, 16); memcpy(&buf[16], dev->t10_wwn.model, min_t(size_t, strlen(dev->t10_wwn.model), 16)); memcpy(&buf[32], dev->t10_wwn.revision, min_t(size_t, strlen(dev->t10_wwn.revision), 4)); buf[4] = 31; /* Set additional length to 31 */ return 0; } EXPORT_SYMBOL(spc_emulate_inquiry_std); /* unit serial number */ static sense_reason_t spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; u16 len; if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial); len++; /* Extra Byte for NULL Terminator */ buf[3] = len; } return 0; } void spc_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf) { unsigned char *p = &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. */ sense_reason_t 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_portal_group *tpg = NULL; struct t10_alua_lu_gp_member *lu_gp_mem; struct t10_alua_tg_pt_gp *tg_pt_gp; unsigned char *prod = &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->dev_flags & DF_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->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]); unit_serial_len++; /* For NULL Terminator */ id_len += sprintf(&buf[off+12], "%s:%s", prod, &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); if (1) { struct t10_alua_lu_gp *lu_gp; u32 padding, scsi_name_len, scsi_target_len; u16 lu_gp_id = 0; u16 tg_pt_gp_id = 0; u16 tpgt; tpg = lun->lun_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->proto_id << 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++] = ((lun->lun_rtpi >> 8) & 0xff); buf[off++] = (lun->lun_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 */ spin_lock(&lun->lun_tg_pt_gp_lock); tg_pt_gp = lun->lun_tg_pt_gp; if (!tg_pt_gp) { spin_unlock(&lun->lun_tg_pt_gp_lock); goto check_lu_gp; } tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; spin_unlock(&lun->lun_tg_pt_gp_lock); buf[off] = tpg->proto_id << 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: buf[off] = tpg->proto_id << 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. */ padding = ((-scsi_name_len) & 3); if (padding) scsi_name_len += padding; if (scsi_name_len > 256) scsi_name_len = 256; buf[off-1] = scsi_name_len; off += scsi_name_len; /* Header size + Designation descriptor */ len += (scsi_name_len + 4); /* * Target device designator */ buf[off] = tpg->proto_id << 4; buf[off++] |= 0x3; /* CODE SET == UTF-8 */ buf[off] = 0x80; /* Set PIV=1 */ /* Set ASSOCIATION == target device: 10b */ buf[off] |= 0x20; /* 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 "" in * UTF-8 encoding. */ scsi_target_len = sprintf(&buf[off], "%s", tpg->se_tpg_tfo->tpg_get_wwn(tpg)); scsi_target_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. */ padding = ((-scsi_target_len) & 3); if (padding) scsi_target_len += padding; if (scsi_target_len > 256) scsi_target_len = 256; buf[off-1] = scsi_target_len; off += scsi_target_len; /* Header size + Designation descriptor */ len += (scsi_target_len + 4); } buf[2] = ((len >> 8) & 0xff); buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */ return 0; } EXPORT_SYMBOL(spc_emulate_evpd_83); /* Extended INQUIRY Data VPD Page */ static sense_reason_t spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; buf[3] = 0x3c; /* * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK * only for TYPE3 protection. */ if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT || cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT) buf[4] = 0x5; else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT || cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT) buf[4] = 0x4; } /* Set HEADSUP, ORDSUP, SIMPSUP */ buf[5] = 0x07; /* If WriteCache emulation is enabled, set V_SUP */ if (target_check_wce(dev)) buf[6] = 0x01; /* If an LBA map is present set R_SUP */ spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); if (!list_empty(&dev->t10_alua.lba_map_list)) buf[8] = 0x10; spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock); return 0; } /* Block Limits VPD page */ static sense_reason_t spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; int have_tp = 0; int opt, min; /* * 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->dev_attrib.emulate_tpu || dev->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 MAXIMUM COMPARE AND WRITE LENGTH */ if (dev->dev_attrib.emulate_caw) buf[5] = 0x01; /* * Set OPTIMAL TRANSFER LENGTH GRANULARITY */ if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev))) put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]); else put_unaligned_be16(1, &buf[6]); /* * Set MAXIMUM TRANSFER LENGTH */ put_unaligned_be32(dev->dev_attrib.hw_max_sectors, &buf[8]); /* * Set OPTIMAL TRANSFER LENGTH */ if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev))) put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]); else put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]); /* * Exit now if we don't support TP. */ if (!have_tp) goto max_write_same; /* * Set MAXIMUM UNMAP LBA COUNT */ put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]); /* * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT */ put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count, &buf[24]); /* * Set OPTIMAL UNMAP GRANULARITY */ put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]); /* * UNMAP GRANULARITY ALIGNMENT */ put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment, &buf[32]); if (dev->dev_attrib.unmap_granularity_alignment != 0) buf[32] |= 0x80; /* Set the UGAVALID bit */ /* * MAXIMUM WRITE SAME LENGTH */ max_write_same: put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); return 0; } /* Block Device Characteristics VPD page */ static sense_reason_t 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->dev_attrib.is_nonrot ? 1 : 0; return 0; } /* Thin Provisioning VPD */ static sense_reason_t 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->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->dev_attrib.emulate_tpws != 0) buf[5] |= 0x40 | 0x20; return 0; } /* Referrals VPD page */ static sense_reason_t spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; buf[0] = dev->transport->get_device_type(dev); buf[3] = 0x0c; put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]); put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]); return 0; } static sense_reason_t spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); static struct { uint8_t page; sense_reason_t (*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 }, { .page = 0xb3, .emulate = spc_emulate_evpd_b3 }, }; /* supported vital product data pages */ static sense_reason_t 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->dev_flags & DF_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 sense_reason_t spc_emulate_inquiry(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_portal_group *tpg = cmd->se_lun->lun_tpg; unsigned char *rbuf; unsigned char *cdb = cmd->t_task_cdb; unsigned char *buf; sense_reason_t ret; int p; int len = 0; buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); if (!buf) { pr_err("Unable to allocate response buffer for INQUIRY\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } 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]); ret = TCM_INVALID_CDB_FIELD; goto out; } ret = spc_emulate_inquiry_std(cmd, buf); len = buf[4] + 5; 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); len = get_unaligned_be16(&buf[2]) + 4; goto out; } } pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); ret = TCM_INVALID_CDB_FIELD; out: rbuf = transport_kmap_data_sg(cmd); if (rbuf) { memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); transport_kunmap_data_sg(cmd); } kfree(buf); if (!ret) target_complete_cmd_with_length(cmd, GOOD, len); return ret; } static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) { p[0] = 0x01; p[1] = 0x0a; /* No changeable values for now */ if (pc == 1) goto out; out: return 12; } static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) { struct se_device *dev = cmd->se_dev; struct se_session *sess = cmd->se_sess; p[0] = 0x0a; p[1] = 0x0a; /* No changeable values for now */ if (pc == 1) goto out; 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->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->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 : (dev->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->dev_attrib.emulate_tas) ? 0x40 : 0x00; /* * From spc4r30, section 7.5.7 Control mode page * * Application Tag Owner (ATO) bit set to one. * * If the ATO bit is set to one the device server shall not modify the * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE * TAG field. */ if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) p[5] |= 0x80; } p[8] = 0xff; p[9] = 0xff; p[11] = 30; out: return 12; } static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) { struct se_device *dev = cmd->se_dev; p[0] = 0x08; p[1] = 0x12; /* No changeable values for now */ if (pc == 1) goto out; if (target_check_wce(dev)) p[2] = 0x04; /* Write Cache Enable */ p[12] = 0x20; /* Disabled Read Ahead */ out: return 20; } static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) { p[0] = 0x1c; p[1] = 0x0a; /* No changeable values for now */ if (pc == 1) goto out; out: return 12; } static struct { uint8_t page; uint8_t subpage; int (*emulate)(struct se_cmd *, u8, unsigned char *); } modesense_handlers[] = { { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, }; 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_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) { *buf++ = 8; put_unaligned_be32(min(blocks, 0xffffffffull), buf); buf += 4; put_unaligned_be32(block_size, buf); return 9; } static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) { if (blocks <= 0xffffffff) return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; *buf++ = 1; /* LONGLBA */ buf += 2; *buf++ = 16; put_unaligned_be64(blocks, buf); buf += 12; put_unaligned_be32(block_size, buf); return 17; } static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; char *cdb = cmd->t_task_cdb; unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; int type = dev->transport->get_device_type(dev); int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); bool dbd = !!(cdb[1] & 0x08); bool llba = ten ? !!(cdb[1] & 0x10) : false; u8 pc = cdb[2] >> 6; u8 page = cdb[2] & 0x3f; u8 subpage = cdb[3]; int length = 0; int ret; int i; bool read_only = target_lun_is_rdonly(cmd);; memset(buf, 0, SE_MODE_PAGE_BUF); /* * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). */ length = ten ? 3 : 2; /* DEVICE-SPECIFIC PARAMETER */ if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) || read_only) spc_modesense_write_protect(&buf[length], type); /* * SBC only allows us to enable FUA and DPO together. Fortunately * DPO is explicitly specified as a hint, so a noop is a perfectly * valid implementation. */ if (target_check_fua(dev)) spc_modesense_dpofua(&buf[length], type); ++length; /* BLOCK DESCRIPTOR */ /* * For now we only include a block descriptor for disk (SBC) * devices; other command sets use a slightly different format. */ if (!dbd && type == TYPE_DISK) { u64 blocks = dev->transport->get_blocks(dev); u32 block_size = dev->dev_attrib.block_size; if (ten) { if (llba) { length += spc_modesense_long_blockdesc(&buf[length], blocks, block_size); } else { length += 3; length += spc_modesense_blockdesc(&buf[length], blocks, block_size); } } else { length += spc_modesense_blockdesc(&buf[length], blocks, block_size); } } else { if (ten) length += 4; else length += 1; } if (page == 0x3f) { if (subpage != 0x00 && subpage != 0xff) { pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); return TCM_INVALID_CDB_FIELD; } for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { /* * Tricky way to say all subpage 00h for * subpage==0, all subpages for subpage==0xff * (and we just checked above that those are * the only two possibilities). */ if ((modesense_handlers[i].subpage & ~subpage) == 0) { ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); if (!ten && length + ret >= 255) break; length += ret; } } goto set_length; } for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) if (modesense_handlers[i].page == page && modesense_handlers[i].subpage == subpage) { length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); goto set_length; } /* * We don't intend to implement: * - obsolete page 03h "format parameters" (checked by Solaris) */ if (page != 0x03) pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", page, subpage); return TCM_UNKNOWN_MODE_PAGE; set_length: if (ten) put_unaligned_be16(length - 2, buf); else buf[0] = length - 1; rbuf = transport_kmap_data_sg(cmd); if (rbuf) { memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); transport_kunmap_data_sg(cmd); } target_complete_cmd_with_length(cmd, GOOD, length); return 0; } static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) { char *cdb = cmd->t_task_cdb; bool ten = cdb[0] == MODE_SELECT_10; int off = ten ? 8 : 4; bool pf = !!(cdb[1] & 0x10); u8 page, subpage; unsigned char *buf; unsigned char tbuf[SE_MODE_PAGE_BUF]; int length; sense_reason_t ret = 0; int i; if (!cmd->data_length) { target_complete_cmd(cmd, GOOD); return 0; } if (cmd->data_length < off + 2) return TCM_PARAMETER_LIST_LENGTH_ERROR; buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; if (!pf) { ret = TCM_INVALID_CDB_FIELD; goto out; } page = buf[off] & 0x3f; subpage = buf[off] & 0x40 ? buf[off + 1] : 0; for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) if (modesense_handlers[i].page == page && modesense_handlers[i].subpage == subpage) { memset(tbuf, 0, SE_MODE_PAGE_BUF); length = modesense_handlers[i].emulate(cmd, 0, tbuf); goto check_contents; } ret = TCM_UNKNOWN_MODE_PAGE; goto out; check_contents: if (cmd->data_length < off + length) { ret = TCM_PARAMETER_LIST_LENGTH_ERROR; goto out; } if (memcmp(buf + off, tbuf, length)) ret = TCM_INVALID_PARAMETER_LIST; out: transport_kunmap_data_sg(cmd); if (!ret) target_complete_cmd(cmd, GOOD); return ret; } static sense_reason_t 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"); return TCM_INVALID_CDB_FIELD; } rbuf = transport_kmap_data_sg(cmd); if (!rbuf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 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; } memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); transport_kunmap_data_sg(cmd); target_complete_cmd(cmd, GOOD); return 0; } sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) { struct se_dev_entry *deve; struct se_session *sess = cmd->se_sess; struct se_node_acl *nacl; unsigned char *buf; u32 lun_count = 0, offset = 8; if (cmd->data_length < 16) { pr_warn("REPORT LUNS allocation length %u too small\n", cmd->data_length); return TCM_INVALID_CDB_FIELD; } buf = transport_kmap_data_sg(cmd); if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; /* * If no struct se_session pointer is present, this struct se_cmd is * coming via a target_core_mod PASSTHROUGH op, and not through * a $FABRIC_MOD. In that case, report LUN=0 only. */ if (!sess) { int_to_scsilun(0, (struct scsi_lun *)&buf[offset]); lun_count = 1; goto done; } nacl = sess->se_node_acl; rcu_read_lock(); hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { /* * We determine the correct LUN LIST LENGTH even once we * have reached the initial allocation length. * See SPC2-R20 7.19. */ lun_count++; if ((offset + 8) > cmd->data_length) continue; int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]); offset += 8; } rcu_read_unlock(); /* * See SPC3 r07, page 159. */ done: lun_count *= 8; buf[0] = ((lun_count >> 24) & 0xff); buf[1] = ((lun_count >> 16) & 0xff); buf[2] = ((lun_count >> 8) & 0xff); buf[3] = (lun_count & 0xff); transport_kunmap_data_sg(cmd); target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); return 0; } EXPORT_SYMBOL(spc_emulate_report_luns); static sense_reason_t spc_emulate_testunitready(struct se_cmd *cmd) { target_complete_cmd(cmd, GOOD); return 0; } sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) { struct se_device *dev = cmd->se_dev; unsigned char *cdb = cmd->t_task_cdb; switch (cdb[0]) { case MODE_SELECT: *size = cdb[4]; cmd->execute_cmd = spc_emulate_modeselect; break; case MODE_SELECT_10: *size = (cdb[7] << 8) + cdb[8]; cmd->execute_cmd = spc_emulate_modeselect; 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: *size = (cdb[7] << 8) + cdb[8]; cmd->execute_cmd = target_scsi3_emulate_pr_in; break; case PERSISTENT_RESERVE_OUT: *size = (cdb[7] << 8) + cdb[8]; cmd->execute_cmd = target_scsi3_emulate_pr_out; break; case RELEASE: case RELEASE_10: if (cdb[0] == RELEASE_10) *size = (cdb[7] << 8) | cdb[8]; else *size = cmd->data_length; 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; 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 implicit HEAD_OF_QUEUE processing for INQUIRY. * See spc4r17 section 5.3 */ cmd->sam_task_attr = TCM_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: *size = get_unaligned_be32(&cdb[10]); cmd->execute_cmd = target_do_xcopy; break; case RECEIVE_COPY_RESULTS: *size = get_unaligned_be32(&cdb[10]); cmd->execute_cmd = target_do_receive_copy_results; break; case READ_ATTRIBUTE: 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 = spc_emulate_report_luns; *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; /* * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS * See spc4r17 section 5.3 */ cmd->sam_task_attr = TCM_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) { 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) { 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]); return TCM_UNSUPPORTED_SCSI_OPCODE; } return 0; } EXPORT_SYMBOL(spc_parse_cdb);