[RFC PATCH 12/19] Target_Core_Mod READ/WRITE command descriptor block generation code This patch adds support for the generation of READ_6, READ_10, READ_12, READ_16, WRITE_6, WRITE_10, WRITE_12 and WRITE_16 command descriptor blocks when handling incoming fabric module requests that exceed the max_sectors presented for a storage object through struct se_subsystem_api_t. Signed-off-by: Nicholas A. Bellinger diff --git a/drivers/target/target_core_scdb.c b/drivers/target/target_core_scdb.c new file mode 100644 index 0000000..ec111d9 --- /dev/null +++ b/drivers/target/target_core_scdb.c @@ -0,0 +1,154 @@ +/******************************************************************************* + * Filename: target_core_scdb.c + * + * This file contains the generic target engine Split CDB related functions. + * + * Copyright (c) 2004-2005 PyX Technologies, Inc. + * Copyright (c) 2005, 2006, 2007 SBE, Inc. + * Copyright (c) 2007-2009 Rising Tide Software, Inc. + * Copyright (c) 2008-2009 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. + * + ******************************************************************************/ + + +#define TARGET_CORE_SCDB_C + +#include +#include + +#include +#include +#include +#include + +#undef TARGET_CORE_SCDB_C + +/* split_cdb_XX_6(): + * + * 21-bit LBA w/ 8-bit SECTORS + */ +void split_cdb_XX_6( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb) +{ + cdb[1] = (lba >> 16) & 0x1f; + cdb[2] = (lba >> 8) & 0xff; + cdb[3] = lba & 0xff; + cdb[4] = *sectors & 0xff; +} + +void split_cdb_RW_6( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb, + int rw) +{ + cdb[0] = (rw) ? 0x0a : 0x08; + split_cdb_XX_6(lba, sectors, &cdb[0]); +} + +/* split_cdb_XX_10(): + * + * 32-bit LBA w/ 16-bit SECTORS + */ +void split_cdb_XX_10( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb) +{ + cdb[2] = (lba >> 24) & 0xff; + cdb[3] = (lba >> 16) & 0xff; + cdb[4] = (lba >> 8) & 0xff; + cdb[5] = lba & 0xff; + cdb[7] = (*sectors >> 8) & 0xff; + cdb[8] = *sectors & 0xff; +} + +void split_cdb_RW_10( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb, + int rw) +{ + cdb[0] = (rw) ? 0x2a : 0x28; + split_cdb_XX_10(lba, sectors, &cdb[0]); +} + +/* split_cdb_XX_12(): + * + * 32-bit LBA w/ 32-bit SECTORS + */ +void split_cdb_XX_12( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb) +{ + cdb[2] = (lba >> 24) & 0xff; + cdb[3] = (lba >> 16) & 0xff; + cdb[4] = (lba >> 8) & 0xff; + cdb[5] = lba & 0xff; + cdb[6] = (*sectors >> 24) & 0xff; + cdb[7] = (*sectors >> 16) & 0xff; + cdb[8] = (*sectors >> 8) & 0xff; + cdb[9] = *sectors & 0xff; +} + +void split_cdb_RW_12( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb, + int rw) +{ + cdb[0] = (rw) ? 0xaa : 0xa8; + split_cdb_XX_12(lba, sectors, &cdb[0]); +} + +/* split_cdb_XX_16(): + * + * 64-bit LBA w/ 32-bit SECTORS + */ +void split_cdb_XX_16( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb) +{ + cdb[2] = (lba >> 56) & 0xff; + cdb[3] = (lba >> 48) & 0xff; + cdb[4] = (lba >> 40) & 0xff; + cdb[5] = (lba >> 32) & 0xff; + cdb[6] = (lba >> 24) & 0xff; + cdb[7] = (lba >> 16) & 0xff; + cdb[8] = (lba >> 8) & 0xff; + cdb[9] = lba & 0xff; + cdb[10] = (*sectors >> 24) & 0xff; + cdb[11] = (*sectors >> 16) & 0xff; + cdb[12] = (*sectors >> 8) & 0xff; + cdb[13] = *sectors & 0xff; +} + +void split_cdb_RW_16( + unsigned long long lba, + u32 *sectors, + unsigned char *cdb, + int rw) +{ + cdb[0] = (rw) ? 0x8a : 0x88; + split_cdb_XX_16(lba, sectors, &cdb[0]); +} diff --git a/include/target/target_core_scdb.h b/include/target/target_core_scdb.h new file mode 100644 index 0000000..1330bc3 --- /dev/null +++ b/include/target/target_core_scdb.h @@ -0,0 +1,42 @@ +/******************************************************************************* + * Filename: target_core_scdb.h + * + * This file contains the iSCSI Transport Split CDB related definitions. + * + * Copyright (c) 2004-2005 PyX Technologies, Inc. + * Copyright (c) 2005, 2006, 2007 SBE, Inc. + * Copyright (c) 2007-2009 Rising Tide Software, Inc. + * Copyright (c) 2008-2009 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. + * + ******************************************************************************/ + + +#ifndef TARGET_CORE_SCDB_H +#define TARGET_CORE_SCDB_H + +extern void split_cdb_XX_6(unsigned long long, u32 *, unsigned char *); +extern void split_cdb_RW_6(unsigned long long, u32 *, unsigned char *, int); +extern void split_cdb_XX_10(unsigned long long, u32 *, unsigned char *); +extern void split_cdb_RW_10(unsigned long long, u32 *, unsigned char *, int); +extern void split_cdb_XX_12(unsigned long long, u32 *, unsigned char *); +extern void split_cdb_RW_12(unsigned long long, u32 *, unsigned char *, int); +extern void split_cdb_XX_16(unsigned long long, u32 *, unsigned char *); +extern void split_cdb_RW_16(unsigned long long, u32 *, unsigned char *, int); + +#endif /* TARGET_CORE_SCDB_H */