1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sd_dif.c - SCSI Data Integrity Field 4 * 5 * Copyright (C) 2007, 2008 Oracle Corporation 6 * 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 */ 27 void sd_dif_config_host(struct scsi_disk *sdkp) 28 { 29 struct scsi_device *sdp = sdkp->device; 30 struct gendisk *disk = sdkp->disk; 31 u8 type = sdkp->protection_type; 32 struct blk_integrity bi; 33 int dif, dix; 34 35 dif = scsi_host_dif_capable(sdp->host, type); 36 dix = scsi_host_dix_capable(sdp->host, type); 37 38 if (!dix && scsi_host_dix_capable(sdp->host, 0)) { 39 dif = 0; dix = 1; 40 } 41 42 if (!dix) 43 return; 44 45 memset(&bi, 0, sizeof(bi)); 46 47 /* Enable DMA of protection information */ 48 if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) { 49 if (type == T10_PI_TYPE3_PROTECTION) 50 bi.profile = &t10_pi_type3_ip; 51 else 52 bi.profile = &t10_pi_type1_ip; 53 54 bi.flags |= BLK_INTEGRITY_IP_CHECKSUM; 55 } else 56 if (type == T10_PI_TYPE3_PROTECTION) 57 bi.profile = &t10_pi_type3_crc; 58 else 59 bi.profile = &t10_pi_type1_crc; 60 61 bi.tuple_size = sizeof(struct t10_pi_tuple); 62 63 if (dif && type) { 64 bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE; 65 66 if (!sdkp->ATO) 67 goto out; 68 69 if (type == T10_PI_TYPE3_PROTECTION) 70 bi.tag_size = sizeof(u16) + sizeof(u32); 71 else 72 bi.tag_size = sizeof(u16); 73 } 74 75 sd_printk(KERN_NOTICE, sdkp, 76 "Enabling DIX %s, application tag size %u bytes\n", 77 bi.profile->name, bi.tag_size); 78 out: 79 blk_integrity_register(disk, &bi); 80 } 81 82