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 */
27void 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}

 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 */
27void 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);
78out:
79	blk_integrity_register(disk, &bi);
80}
81