/* * CDB emulation for non-READ/WRITE commands. * * 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 "target_core_ua.h" static void target_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 target_emulate_inquiry_std(struct se_cmd *cmd) { struct se_lun *lun = cmd->se_lun; struct se_device *dev = cmd->se_dev; unsigned char *buf = cmd->t_task_buf; /* * Make sure we at least have 6 bytes of INQUIRY response * payload going back for EVPD=0 */ if (cmd->data_length < 6) { printk(KERN_ERR "SCSI Inquiry payload length: %u" " too small for EVPD=0\n", cmd->data_length); return -EINVAL; } buf[0] = dev->transport->get_device_type(dev); if (buf[0] == TYPE_TAPE) buf[1] = 0x80; buf[2] = dev->transport->get_device_rev(dev); /* * Enable SCCS and TPGS fields for Emulated ALUA */ if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) target_fill_alua_data(lun->lun_sep, buf); if (cmd->data_length < 8) { buf[4] = 1; /* Set additional length to 1 */ return 0; } buf[7] = 0x32; /* Sync=1 and CmdQue=1 */ /* * Do not include vendor, product, reversion info in INQUIRY * response payload for cdbs with a small allocation length. */ if (cmd->data_length < 36) { buf[4] = 3; /* Set additional length to 3 */ return 0; } snprintf((unsigned char *)&buf[8], 8, "LIO-ORG"); snprintf((unsigned char *)&buf[16], 16, "%s", &dev->se_sub_dev->t10_wwn.model[0]); snprintf((unsigned char *)&buf[32], 4, "%s", &dev->se_sub_dev->t10_wwn.revision[0]); buf[4] = 31; /* Set additional length to 31 */ return 0; } /* unit serial number */ static int target_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[0]); unit_serial_len++; /* For NULL Terminator */ if (((len + 4) + unit_serial_len) > cmd->data_length) { len += unit_serial_len; buf[2] = ((len >> 8) & 0xff); buf[3] = (len & 0xff); return 0; } len += sprintf((unsigned char *)&buf[4], "%s", &dev->se_sub_dev->t10_wwn.unit_serial[0]); len++; /* Extra Byte for NULL Terminator */ buf[3] = len; } return 0; } /* * Device identification VPD, for a complete list of * DESIGNATOR TYPEs see spc4r17 Table 459. */ static int target_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 binary, binary_new; unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0]; u32 prod_len; u32 unit_serial_len, off = 0; int i; 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; if (off + 20 > cmd->data_length) goto check_t10_vend_desc; /* CODE SET == Binary */ buf[off++] = 0x1; /* Set ASSOICATION == 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 */ binary = transport_asciihex_to_binaryhex( &dev->se_sub_dev->t10_wwn.unit_serial[0]); buf[off++] |= (binary & 0xf0) >> 4; for (i = 0; i < 24; i += 2) { binary_new = transport_asciihex_to_binaryhex( &dev->se_sub_dev->t10_wwn.unit_serial[i+2]); buf[off] = (binary & 0x0f) << 4; buf[off++] |= (binary_new & 0xf0) >> 4; binary = binary_new; } 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 */ if ((len + (id_len + 4) + (prod_len + unit_serial_len)) > cmd->data_length) { len += (prod_len + unit_serial_len); goto check_port; } id_len += sprintf((unsigned char *)&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((unsigned char *)&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 */ check_port: 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 */ if (((len + 4) + 8) > cmd->data_length) { len += 8; goto check_tpgi; } 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 ASSOICATION == 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 */ check_tpgi: if (dev->se_sub_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) goto check_scsi_name; if (((len + 4) + 8) > cmd->data_length) { len += 8; goto check_lu_gp; } 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 ASSOICATION == 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: if (((len + 4) + 8) > cmd->data_length) { len += 8; goto check_scsi_name; } 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; if (((len + 4) + scsi_name_len) > cmd->data_length) { len += scsi_name_len; goto set_len; } 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 ASSOICATION == 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); } set_len: buf[2] = ((len >> 8) & 0xff); buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */ return 0; } /* Extended INQUIRY Data VPD Page */ static int target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) { if (cmd->data_length < 60) return 0; buf[2] = 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 target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; int have_tp = 0; /* * Following sbc3r22 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; if (cmd->data_length < (0x10 + 4)) { printk(KERN_INFO "Received data_length: %u" " too small for EVPD 0xb0\n", cmd->data_length); return -EINVAL; } if (have_tp && cmd->data_length < (0x3c + 4)) { printk(KERN_INFO "Received data_length: %u" " too small for TPE=1 EVPD 0xb0\n", cmd->data_length); have_tp = 0; } buf[0] = dev->transport->get_device_type(dev); buf[3] = have_tp ? 0x3c : 0x10; /* * Set OPTIMAL TRANSFER LENGTH GRANULARITY */ put_unaligned_be16(1, &buf[6]); /* * Set MAXIMUM TRANSFER LENGTH */ put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.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 or the initiator sent a too * short buffer. */ if (!have_tp || cmd->data_length < (0x3c + 4)) 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; } /* Thin Provisioning VPD */ static int target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; /* * From sbc3r22 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 target_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 = target_emulate_evpd_00 }, { .page = 0x80, .emulate = target_emulate_evpd_80 }, { .page = 0x83, .emulate = target_emulate_evpd_83 }, { .page = 0x86, .emulate = target_emulate_evpd_86 }, { .page = 0xb0, .emulate = target_emulate_evpd_b0 }, { .page = 0xb2, .emulate = target_emulate_evpd_b2 }, }; /* supported vital product data pages */ static int target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) { int p; if (cmd->data_length < 8) return 0; /* * 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 < min_t(int, ARRAY_SIZE(evpd_handlers), cmd->data_length - 4); ++p) buf[p + 4] = evpd_handlers[p].page; } return 0; } static int target_emulate_inquiry(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; unsigned char *buf = cmd->t_task_buf; unsigned char *cdb = cmd->t_task_cdb; int p; if (!(cdb[1] & 0x1)) return target_emulate_inquiry_std(cmd); /* * Make sure we at least have 4 bytes of INQUIRY response * payload for 0x00 going back for EVPD=1. Note that 0x80 * and 0x83 will check for enough payload data length and * jump to set_len: label when there is not enough inquiry EVPD * payload length left for the next outgoing EVPD metadata */ if (cmd->data_length < 4) { printk(KERN_ERR "SCSI Inquiry payload length: %u" " too small for EVPD=1\n", cmd->data_length); return -EINVAL; } buf[0] = dev->transport->get_device_type(dev); for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) if (cdb[2] == evpd_handlers[p].page) { buf[1] = cdb[2]; return evpd_handlers[p].emulate(cmd, buf); } printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]); return -EINVAL; } static int target_emulate_readcapacity(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; unsigned char *buf = cmd->t_task_buf; unsigned long long blocks_long = dev->transport->get_blocks(dev); u32 blocks; if (blocks_long >= 0x00000000ffffffff) blocks = 0xffffffff; else blocks = (u32)blocks_long; buf[0] = (blocks >> 24) & 0xff; buf[1] = (blocks >> 16) & 0xff; buf[2] = (blocks >> 8) & 0xff; buf[3] = blocks & 0xff; buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; /* * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16 */ if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) put_unaligned_be32(0xFFFFFFFF, &buf[0]); return 0; } static int target_emulate_readcapacity_16(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; unsigned char *buf = cmd->t_task_buf; unsigned long long blocks = dev->transport->get_blocks(dev); buf[0] = (blocks >> 56) & 0xff; buf[1] = (blocks >> 48) & 0xff; buf[2] = (blocks >> 40) & 0xff; buf[3] = (blocks >> 32) & 0xff; buf[4] = (blocks >> 24) & 0xff; buf[5] = (blocks >> 16) & 0xff; buf[6] = (blocks >> 8) & 0xff; buf[7] = blocks & 0xff; buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; /* * Set Thin Provisioning Enable bit following sbc3r22 in section * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. */ if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) buf[14] = 0x80; return 0; } static int target_modesense_rwrecovery(unsigned char *p) { p[0] = 0x01; p[1] = 0x0a; return 12; } static int target_modesense_control(struct se_device *dev, unsigned char *p) { p[0] = 0x0a; p[1] = 0x0a; p[2] = 2; /* * 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 target_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 target_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 target_modesense_dpofua(unsigned char *buf, int type) { switch (type) { case TYPE_DISK: buf[0] |= 0x10; /* DPOFUA bit */ break; default: break; } } static int target_emulate_modesense(struct se_cmd *cmd, int ten) { struct se_device *dev = cmd->se_dev; char *cdb = cmd->t_task_cdb; unsigned char *rbuf = cmd->t_task_buf; int type = dev->transport->get_device_type(dev); 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 = target_modesense_rwrecovery(&buf[offset]); break; case 0x08: length = target_modesense_caching(dev, &buf[offset]); break; case 0x0a: length = target_modesense_control(dev, &buf[offset]); break; case 0x3f: length = target_modesense_rwrecovery(&buf[offset]); length += target_modesense_caching(dev, &buf[offset+length]); length += target_modesense_control(dev, &buf[offset+length]); break; default: printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n", cdb[2] & 0x3f); return PYX_TRANSPORT_UNKNOWN_MODE_PAGE; } 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))) target_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)) target_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))) target_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)) target_modesense_dpofua(&buf[2], type); if ((offset + 1) > cmd->data_length) offset = cmd->data_length; } memcpy(rbuf, buf, offset); return 0; } static int target_emulate_request_sense(struct se_cmd *cmd) { unsigned char *cdb = cmd->t_task_cdb; unsigned char *buf = cmd->t_task_buf; u8 ua_asc = 0, ua_ascq = 0; if (cdb[1] & 0x01) { printk(KERN_ERR "REQUEST_SENSE description emulation not" " supported\n"); return PYX_TRANSPORT_INVALID_CDB_FIELD; } 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; /* * Make sure request data length is enough for additional * sense data. */ if (cmd->data_length <= 18) { buf[7] = 0x00; return 0; } /* * 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; /* * Make sure request data length is enough for additional * sense data. */ if (cmd->data_length <= 18) { buf[7] = 0x00; return 0; } /* * NO ADDITIONAL SENSE INFORMATION */ buf[SPC_ASC_KEY_OFFSET] = 0x00; buf[7] = 0x0A; } return 0; } /* * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. * Note this is not used for TCM/pSCSI passthrough */ static int target_emulate_unmap(struct se_task *task) { struct se_cmd *cmd = task->task_se_cmd; struct se_device *dev = cmd->se_dev; unsigned char *buf = cmd->t_task_buf, *ptr = NULL; unsigned char *cdb = &cmd->t_task_cdb[0]; sector_t lba; unsigned int size = cmd->data_length, range; int ret, offset; unsigned short dl, bd_dl; /* First UNMAP block descriptor starts at 8 byte offset */ offset = 8; size -= 8; dl = get_unaligned_be16(&cdb[0]); bd_dl = get_unaligned_be16(&cdb[2]); ptr = &buf[offset]; printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu" " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); while (size) { lba = get_unaligned_be64(&ptr[0]); range = get_unaligned_be32(&ptr[8]); printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n", (unsigned long long)lba, range); ret = dev->transport->do_discard(dev, lba, range); if (ret < 0) { printk(KERN_ERR "blkdev_issue_discard() failed: %d\n", ret); return ret; } ptr += 16; size -= 16; } task->task_scsi_status = GOOD; transport_complete_task(task, 1); return 0; } /* * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. * Note this is not used for TCM/pSCSI passthrough */ static int target_emulate_write_same(struct se_task *task, int write_same32) { struct se_cmd *cmd = task->task_se_cmd; struct se_device *dev = cmd->se_dev; sector_t range; sector_t lba = cmd->t_task_lba; unsigned int num_blocks; int ret; /* * Extract num_blocks from the WRITE_SAME_* CDB. Then use the explict * range when non zero is supplied, otherwise calculate the remaining * range based on ->get_blocks() - starting LBA. */ if (write_same32) num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); else num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); if (num_blocks != 0) range = num_blocks; else range = (dev->transport->get_blocks(dev) - lba); printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n", (unsigned long long)lba, (unsigned long long)range); ret = dev->transport->do_discard(dev, lba, range); if (ret < 0) { printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n"); return ret; } task->task_scsi_status = GOOD; transport_complete_task(task, 1); return 0; } int transport_emulate_control_cdb(struct se_task *task) { struct se_cmd *cmd = task->task_se_cmd; struct se_device *dev = cmd->se_dev; unsigned short service_action; int ret = 0; switch (cmd->t_task_cdb[0]) { case INQUIRY: ret = target_emulate_inquiry(cmd); break; case READ_CAPACITY: ret = target_emulate_readcapacity(cmd); break; case MODE_SENSE: ret = target_emulate_modesense(cmd, 0); break; case MODE_SENSE_10: ret = target_emulate_modesense(cmd, 1); break; case SERVICE_ACTION_IN: switch (cmd->t_task_cdb[1] & 0x1f) { case SAI_READ_CAPACITY_16: ret = target_emulate_readcapacity_16(cmd); break; default: printk(KERN_ERR "Unsupported SA: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f); return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; } break; case REQUEST_SENSE: ret = target_emulate_request_sense(cmd); break; case UNMAP: if (!dev->transport->do_discard) { printk(KERN_ERR "UNMAP emulation not supported for: %s\n", dev->transport->name); return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; } ret = target_emulate_unmap(task); break; case WRITE_SAME_16: if (!dev->transport->do_discard) { printk(KERN_ERR "WRITE_SAME_16 emulation not supported" " for: %s\n", dev->transport->name); return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; } ret = target_emulate_write_same(task, 0); break; case VARIABLE_LENGTH_CMD: service_action = get_unaligned_be16(&cmd->t_task_cdb[8]); switch (service_action) { case WRITE_SAME_32: if (!dev->transport->do_discard) { printk(KERN_ERR "WRITE_SAME_32 SA emulation not" " supported for: %s\n", dev->transport->name); return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; } ret = target_emulate_write_same(task, 1); break; default: printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:" " 0x%02x\n", service_action); break; } break; case SYNCHRONIZE_CACHE: case 0x91: /* SYNCHRONIZE_CACHE_16: */ if (!dev->transport->do_sync_cache) { printk(KERN_ERR "SYNCHRONIZE_CACHE emulation not supported" " for: %s\n", dev->transport->name); return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; } dev->transport->do_sync_cache(task); break; case ALLOW_MEDIUM_REMOVAL: case ERASE: case REZERO_UNIT: case SEEK_10: case SPACE: case START_STOP: case TEST_UNIT_READY: case VERIFY: case WRITE_FILEMARKS: break; default: printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n", cmd->t_task_cdb[0], dev->transport->name); return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; } if (ret < 0) return ret; task->task_scsi_status = GOOD; transport_complete_task(task, 1); return PYX_TRANSPORT_SENT_TO_TRANSPORT; }