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// SPDX-License-Identifier: GPL-2.0-only
/*
* sd_dif.c - SCSI Data Integrity Field
*
* Copyright (C) 2007, 2008 Oracle Corporation
* Written by: Martin K. Petersen <martin.petersen@oracle.com>
*/
#include <linux/blk-integrity.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 queue_limits *lim)
{
struct scsi_device *sdp = sdkp->device;
u8 type = sdkp->protection_type;
struct blk_integrity *bi = &lim->integrity;
int dif, dix;
memset(bi, 0, sizeof(*bi));
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;
/* Enable DMA of protection information */
if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP)
bi->csum_type = BLK_INTEGRITY_CSUM_IP;
else
bi->csum_type = BLK_INTEGRITY_CSUM_CRC;
if (type != T10_PI_TYPE3_PROTECTION)
bi->flags |= BLK_INTEGRITY_REF_TAG;
bi->tuple_size = sizeof(struct t10_pi_tuple);
if (dif && type) {
bi->flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
if (!sdkp->ATO)
return;
if (type == T10_PI_TYPE3_PROTECTION)
bi->tag_size = sizeof(u16) + sizeof(u32);
else
bi->tag_size = sizeof(u16);
}
sd_first_printk(KERN_NOTICE, sdkp,
"Enabling DIX %s, application tag size %u bytes\n",
blk_integrity_profile_name(bi), bi->tag_size);
}
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