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, 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 else 50 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->metadata_size = sizeof(struct t10_pi_tuple); 56 bi->pi_tuple_size = bi->metadata_size; 57 58 if (dif && type) { 59 bi->flags |= BLK_INTEGRITY_DEVICE_CAPABLE; 60 61 if (!sdkp->ATO) 62 return; 63 64 if (type == T10_PI_TYPE3_PROTECTION) 65 bi->tag_size = sizeof(u16) + sizeof(u32); 66 else 67 bi->tag_size = sizeof(u16); 68 } 69 70 sd_first_printk(KERN_NOTICE, sdkp, 71 "Enabling DIX %s, application tag size %u bytes\n", 72 blk_integrity_profile_name(bi), bi->tag_size); 73 } 74