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 */
sd_dif_config_host(struct scsi_disk * sdkp,struct queue_limits * lim)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->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 else
66 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