// 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/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); }