drivers/scsi/sd_dif.c

   1 // SPDX-License-Identifier: GPL-2.0
   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/blkdev.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         sd_printk(KERN_NOTICE, sdkp,
  63                   "Enabling DIX %s protection\n", bi.profile->name);
  64
  65         if (dif && type) {
  66                 bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
  67
  68                 if (!sdkp->ATO)
  69                         goto out;
  70
  71                 if (type == T10_PI_TYPE3_PROTECTION)
  72                         bi.tag_size = sizeof(u16) + sizeof(u32);
  73                 else
  74                         bi.tag_size = sizeof(u16);
  75
  76                 sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n",
  77                           bi.tag_size);
  78         }
  79
  80 out:
  81         blk_integrity_register(disk, &bi);
  82 }
  83