98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* sd_dif.c - SCSI Data Integrity Field
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*
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* Copyright (C) 2007, 2008 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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*/
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#include <linux/blkdev.h>
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#include <linux/t10-pi.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsicam.h>
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#include "sd.h"
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/*
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* Configure exchange of protection information between OS and HBA.
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*/
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void sd_dif_config_host(struct scsi_disk *sdkp)
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{
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struct scsi_device *sdp = sdkp->device;
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struct gendisk *disk = sdkp->disk;
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u8 type = sdkp->protection_type;
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struct blk_integrity bi;
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int dif, dix;
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dif = scsi_host_dif_capable(sdp->host, type);
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dix = scsi_host_dix_capable(sdp->host, type);
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if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
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dif = 0; dix = 1;
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}
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if (!dix)
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return;
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memset(&bi, 0, sizeof(bi));
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/* Enable DMA of protection information */
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if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) {
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if (type == T10_PI_TYPE3_PROTECTION)
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bi.profile = &t10_pi_type3_ip;
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else
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bi.profile = &t10_pi_type1_ip;
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bi.flags |= BLK_INTEGRITY_IP_CHECKSUM;
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} else
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if (type == T10_PI_TYPE3_PROTECTION)
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bi.profile = &t10_pi_type3_crc;
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else
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bi.profile = &t10_pi_type1_crc;
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bi.tuple_size = sizeof(struct t10_pi_tuple);
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sd_printk(KERN_NOTICE, sdkp,
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"Enabling DIX %s protection\n", bi.profile->name);
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if (dif && type) {
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bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
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if (!sdkp->ATO)
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goto out;
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if (type == T10_PI_TYPE3_PROTECTION)
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bi.tag_size = sizeof(u16) + sizeof(u32);
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else
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bi.tag_size = sizeof(u16);
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sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n",
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bi.tag_size);
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}
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out:
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blk_integrity_register(disk, &bi);
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}
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