diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/scsi/sd_dif.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c new file mode 100644 index 000000000..db72c8248 --- /dev/null +++ b/drivers/scsi/sd_dif.c @@ -0,0 +1,97 @@ +/* + * sd_dif.c - SCSI Data Integrity Field + * + * Copyright (C) 2007, 2008 Oracle Corporation + * Written by: Martin K. Petersen <martin.petersen@oracle.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * 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; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, + * USA. + * + */ + +#include <linux/blkdev.h> +#include <linux/t10-pi.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/scsicam.h> + +#include "sd.h" + +/* + * Configure exchange of protection information between OS and HBA. + */ +void sd_dif_config_host(struct scsi_disk *sdkp) +{ + struct scsi_device *sdp = sdkp->device; + struct gendisk *disk = sdkp->disk; + u8 type = sdkp->protection_type; + struct blk_integrity bi; + int dif, dix; + + dif = scsi_host_dif_capable(sdp->host, type); + dix = scsi_host_dix_capable(sdp->host, type); + + if (!dix && scsi_host_dix_capable(sdp->host, 0)) { + dif = 0; dix = 1; + } + + if (!dix) + return; + + memset(&bi, 0, sizeof(bi)); + + /* Enable DMA of protection information */ + if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) { + if (type == T10_PI_TYPE3_PROTECTION) + bi.profile = &t10_pi_type3_ip; + else + bi.profile = &t10_pi_type1_ip; + + bi.flags |= BLK_INTEGRITY_IP_CHECKSUM; + } else + if (type == T10_PI_TYPE3_PROTECTION) + bi.profile = &t10_pi_type3_crc; + else + bi.profile = &t10_pi_type1_crc; + + bi.tuple_size = sizeof(struct t10_pi_tuple); + sd_printk(KERN_NOTICE, sdkp, + "Enabling DIX %s protection\n", bi.profile->name); + + if (dif && type) { + bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; + + if (!sdkp->ATO) + goto out; + + if (type == T10_PI_TYPE3_PROTECTION) + bi.tag_size = sizeof(u16) + sizeof(u32); + else + bi.tag_size = sizeof(u16); + + sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n", + bi.tag_size); + } + +out: + blk_integrity_register(disk, &bi); +} + |