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76e45252a4
Introduce a new pi_tuple_size field in struct blk_integrity to explicitly represent the size (in bytes) of the protection information (PI) tuple. This is a prep patch. Add validation in blk_validate_integrity_limits() to ensure that pi size matches the expected size for known checksum types and never exceeds the pi_tuple_size. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anuj Gupta <anuj20.g@samsung.com> Link: https://lore.kernel.org/20250630090548.3317-3-anuj20.g@samsung.com Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sd_dif.c - SCSI Data Integrity Field
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*
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* Copyright (C) 2007, 2008 Oracle Corporation
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* Written by: Martin K. Petersen <martin.petersen@oracle.com>
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*/
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#include <linux/blk-integrity.h>
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#include <linux/t10-pi.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsicam.h>
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#include "sd.h"
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/*
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* Configure exchange of protection information between OS and HBA.
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*/
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void sd_dif_config_host(struct scsi_disk *sdkp, struct queue_limits *lim)
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{
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struct scsi_device *sdp = sdkp->device;
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u8 type = sdkp->protection_type;
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struct blk_integrity *bi = &lim->integrity;
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int dif, dix;
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memset(bi, 0, sizeof(*bi));
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dif = scsi_host_dif_capable(sdp->host, type);
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dix = scsi_host_dix_capable(sdp->host, type);
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if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
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dif = 0; dix = 1;
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}
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if (!dix)
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return;
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/* Enable DMA of protection information */
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if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP)
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bi->csum_type = BLK_INTEGRITY_CSUM_IP;
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else
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bi->csum_type = BLK_INTEGRITY_CSUM_CRC;
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if (type != T10_PI_TYPE3_PROTECTION)
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bi->flags |= BLK_INTEGRITY_REF_TAG;
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bi->metadata_size = sizeof(struct t10_pi_tuple);
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bi->pi_tuple_size = bi->metadata_size;
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if (dif && type) {
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bi->flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
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if (!sdkp->ATO)
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return;
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if (type == T10_PI_TYPE3_PROTECTION)
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bi->tag_size = sizeof(u16) + sizeof(u32);
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else
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bi->tag_size = sizeof(u16);
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}
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sd_first_printk(KERN_NOTICE, sdkp,
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"Enabling DIX %s, application tag size %u bytes\n",
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blk_integrity_profile_name(bi), bi->tag_size);
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}
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