diff options
Diffstat (limited to 'drivers/target/target_core_cdb.c')
| -rw-r--r-- | drivers/target/target_core_cdb.c | 1131 |
1 files changed, 1131 insertions, 0 deletions
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c new file mode 100644 index 000000000000..366080baf474 --- /dev/null +++ b/drivers/target/target_core_cdb.c @@ -0,0 +1,1131 @@ +/* + * 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 <nab@kernel.org> + * + * 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 <asm/unaligned.h> +#include <scsi/scsi.h> + +#include <target/target_core_base.h> +#include <target/target_core_transport.h> +#include <target/target_core_fabric_ops.h> +#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 = SE_LUN(cmd); + struct se_device *dev = SE_DEV(cmd); + unsigned char *buf = cmd->t_task->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 -1; + } + + 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 (T10_ALUA(dev->se_sub_dev)->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_T10_WWN(dev)->model[0]); + snprintf((unsigned char *)&buf[32], 4, "%s", + &DEV_T10_WWN(dev)->revision[0]); + buf[4] = 31; /* Set additional length to 31 */ + return 0; +} + +/* supported vital product data pages */ +static int +target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) +{ + buf[1] = 0x00; + if (cmd->data_length < 8) + return 0; + + buf[4] = 0x0; + /* + * 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 (SE_DEV(cmd)->se_sub_dev->su_dev_flags & + SDF_EMULATED_VPD_UNIT_SERIAL) { + buf[3] = 3; + buf[5] = 0x80; + buf[6] = 0x83; + buf[7] = 0x86; + } + + return 0; +} + +/* unit serial number */ +static int +target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) +{ + struct se_device *dev = SE_DEV(cmd); + u16 len = 0; + + buf[1] = 0x80; + if (dev->se_sub_dev->su_dev_flags & + SDF_EMULATED_VPD_UNIT_SERIAL) { + u32 unit_serial_len; + + unit_serial_len = + strlen(&DEV_T10_WWN(dev)->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_T10_WWN(dev)->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 = SE_DEV(cmd); + struct se_lun *lun = SE_LUN(cmd); + 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_T10_WWN(dev)->model[0]; + u32 prod_len; + u32 unit_serial_len, off = 0; + int i; + u16 len = 0, id_len; + + buf[1] = 0x83; + 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_T10_WWN(dev)->unit_serial[0]); + buf[off++] |= (binary & 0xf0) >> 4; + for (i = 0; i < 24; i += 2) { + binary_new = transport_asciihex_to_binaryhex( + &DEV_T10_WWN(dev)->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_T10_WWN(dev)->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_T10_WWN(dev)->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_TFO(tpg)->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 (T10_ALUA(dev->se_sub_dev)->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_TFO(tpg)->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_TFO(tpg)->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_TFO(tpg)->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 "<iSCSI name>,t,0x<TPGT> in + * UTF-8 encoding. + */ + tpgt = TPG_TFO(tpg)->tpg_get_tag(tpg); + scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", + TPG_TFO(tpg)->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[1] = 0x86; + buf[2] = 0x3c; + /* Set HEADSUP, ORDSUP, SIMPSUP */ + buf[5] = 0x07; + + /* If WriteCache emulation is enabled, set V_SUP */ + if (DEV_ATTRIB(SE_DEV(cmd))->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 = SE_DEV(cmd); + 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_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->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 -1; + } + + 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[1] = 0xb0; + 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_ATTRIB(dev)->max_sectors, &buf[8]); + + /* + * Set OPTIMAL TRANSFER LENGTH + */ + put_unaligned_be32(DEV_ATTRIB(dev)->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_ATTRIB(dev)->max_unmap_lba_count, &buf[20]); + + /* + * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT + */ + put_unaligned_be32(DEV_ATTRIB(dev)->max_unmap_block_desc_count, + &buf[24]); + + /* + * Set OPTIMAL UNMAP GRANULARITY + */ + put_unaligned_be32(DEV_ATTRIB(dev)->unmap_granularity, &buf[28]); + + /* + * UNMAP GRANULARITY ALIGNMENT + */ + put_unaligned_be32(DEV_ATTRIB(dev)->unmap_granularity_alignment, + &buf[32]); + if (DEV_ATTRIB(dev)->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 = SE_DEV(cmd); + + /* + * 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); + buf[1] = 0xb2; + + /* + * 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_ATTRIB(dev)->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_ATTRIB(dev)->emulate_tpws != 0) + buf[5] |= 0x40; + + return 0; +} + +static int +target_emulate_inquiry(struct se_cmd *cmd) +{ + struct se_device *dev = SE_DEV(cmd); + unsigned char *buf = cmd->t_task->t_task_buf; + unsigned char *cdb = cmd->t_task->t_task_cdb; + + 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 -1; + } + buf[0] = dev->transport->get_device_type(dev); + + switch (cdb[2]) { + case 0x00: + return target_emulate_evpd_00(cmd, buf); + case 0x80: + return target_emulate_evpd_80(cmd, buf); + case 0x83: + return target_emulate_evpd_83(cmd, buf); + case 0x86: + return target_emulate_evpd_86(cmd, buf); + case 0xb0: + return target_emulate_evpd_b0(cmd, buf); + case 0xb2: + return target_emulate_evpd_b2(cmd, buf); + default: + printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]); + return -1; + } + + return 0; +} + +static int +target_emulate_readcapacity(struct se_cmd *cmd) +{ + struct se_device *dev = SE_DEV(cmd); + unsigned char *buf = cmd->t_task->t_task_buf; + u32 blocks = dev->transport->get_blocks(dev); + + buf[0] = (blocks >> 24) & 0xff; + buf[1] = (blocks >> 16) & 0xff; + buf[2] = (blocks >> 8) & 0xff; + buf[3] = blocks & 0xff; + buf[4] = (DEV_ATTRIB(dev)->block_size >> 24) & 0xff; + buf[5] = (DEV_ATTRIB(dev)->block_size >> 16) & 0xff; + buf[6] = (DEV_ATTRIB(dev)->block_size >> 8) & 0xff; + buf[7] = DEV_ATTRIB(dev)->block_size & 0xff; + /* + * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16 + */ + if (DEV_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->emulate_tpws) + put_unaligned_be32(0xFFFFFFFF, &buf[0]); + + return 0; +} + +static int +target_emulate_readcapacity_16(struct se_cmd *cmd) +{ + struct se_device *dev = SE_DEV(cmd); + unsigned char *buf = cmd->t_task->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_ATTRIB(dev)->block_size >> 24) & 0xff; + buf[9] = (DEV_ATTRIB(dev)->block_size >> 16) & 0xff; + buf[10] = (DEV_ATTRIB(dev)->block_size >> 8) & 0xff; + buf[11] = DEV_ATTRIB(dev)->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_ATTRIB(dev)->emulate_tpu || DEV_ATTRIB(dev)->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_ATTRIB(dev)->emulate_ua_intlck_ctrl == 2) ? 0x30 : + (DEV_ATTRIB(dev)->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_ATTRIB(dev)->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_ATTRIB(dev)->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 = SE_DEV(cmd); + char *cdb = cmd->t_task->t_task_cdb; + unsigned char *rbuf = cmd->t_task->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 ((SE_LUN(cmd)->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_ATTRIB(dev)->emulate_write_cache > 0) && + (DEV_ATTRIB(dev)->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 ((SE_LUN(cmd)->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_ATTRIB(dev)->emulate_write_cache > 0) && + (DEV_ATTRIB(dev)->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->t_task_cdb; + unsigned char *buf = cmd->t_task->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_CMD(task); + struct se_device *dev = SE_DEV(cmd); + unsigned char *buf = cmd->t_task->t_task_buf, *ptr = NULL; + unsigned char *cdb = &cmd->t_task->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 -1; + } + + 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) +{ + struct se_cmd *cmd = TASK_CMD(task); + struct se_device *dev = SE_DEV(cmd); + sector_t lba = cmd->t_task->t_task_lba; + unsigned int range; + int ret; + + range = (cmd->data_length / DEV_ATTRIB(dev)->block_size); + + printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %u\n", + (unsigned long long)lba, range); + + ret = dev->transport->do_discard(dev, lba, range); + if (ret < 0) { + printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n"); + return -1; + } + + 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_CMD(task); + struct se_device *dev = SE_DEV(cmd); + unsigned short service_action; + int ret = 0; + + switch (cmd->t_task->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->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->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); + break; + case VARIABLE_LENGTH_CMD: + service_action = + get_unaligned_be16(&cmd->t_task->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); + 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->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; +} |
