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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * sd_dif.c - SCSI Data Integrity Field4 *5 * Copyright (C) 2007, 2008 Oracle Corporation6 * Written by: Martin K. Petersen <martin.petersen@oracle.com>7 */8 9#include <linux/blk-integrity.h>10#include <linux/t10-pi.h>11 12#include <scsi/scsi.h>13#include <scsi/scsi_cmnd.h>14#include <scsi/scsi_dbg.h>15#include <scsi/scsi_device.h>16#include <scsi/scsi_driver.h>17#include <scsi/scsi_eh.h>18#include <scsi/scsi_host.h>19#include <scsi/scsi_ioctl.h>20#include <scsi/scsicam.h>21 22#include "sd.h"23 24/*25 * Configure exchange of protection information between OS and HBA.26 */27void sd_dif_config_host(struct scsi_disk *sdkp, struct queue_limits *lim)28{29 struct scsi_device *sdp = sdkp->device;30 u8 type = sdkp->protection_type;31 struct blk_integrity *bi = &lim->integrity;32 int dif, dix;33 34 memset(bi, 0, sizeof(*bi));35 36 dif = scsi_host_dif_capable(sdp->host, type);37 dix = scsi_host_dix_capable(sdp->host, type);38 39 if (!dix && scsi_host_dix_capable(sdp->host, 0)) {40 dif = 0; dix = 1;41 }42 43 if (!dix)44 return;45 46 /* Enable DMA of protection information */47 if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP)48 bi->csum_type = BLK_INTEGRITY_CSUM_IP;49 else50 bi->csum_type = BLK_INTEGRITY_CSUM_CRC;51 52 if (type != T10_PI_TYPE3_PROTECTION)53 bi->flags |= BLK_INTEGRITY_REF_TAG;54 55 bi->tuple_size = sizeof(struct t10_pi_tuple);56 57 if (dif && type) {58 bi->flags |= BLK_INTEGRITY_DEVICE_CAPABLE;59 60 if (!sdkp->ATO)61 return;62 63 if (type == T10_PI_TYPE3_PROTECTION)64 bi->tag_size = sizeof(u16) + sizeof(u32);65 else66 bi->tag_size = sizeof(u16);67 }68 69 sd_first_printk(KERN_NOTICE, sdkp,70 "Enabling DIX %s, application tag size %u bytes\n",71 blk_integrity_profile_name(bi), bi->tag_size);72}73