/* SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB) */
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/*
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* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
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*/
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#ifndef _RDMA_SIGNATURE_H_
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#define _RDMA_SIGNATURE_H_
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#include <linux/types.h>
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enum ib_signature_prot_cap {
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IB_PROT_T10DIF_TYPE_1 = 1,
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IB_PROT_T10DIF_TYPE_2 = 1 << 1,
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IB_PROT_T10DIF_TYPE_3 = 1 << 2,
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};
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enum ib_signature_guard_cap {
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IB_GUARD_T10DIF_CRC = 1,
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IB_GUARD_T10DIF_CSUM = 1 << 1,
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};
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/**
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* enum ib_signature_type - Signature types
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* @IB_SIG_TYPE_NONE: Unprotected.
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* @IB_SIG_TYPE_T10_DIF: Type T10-DIF
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*/
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enum ib_signature_type {
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IB_SIG_TYPE_NONE,
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IB_SIG_TYPE_T10_DIF,
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};
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/**
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* enum ib_t10_dif_bg_type - Signature T10-DIF block-guard types
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* @IB_T10DIF_CRC: Corresponds to T10-PI mandated CRC checksum rules.
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* @IB_T10DIF_CSUM: Corresponds to IP checksum rules.
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*/
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enum ib_t10_dif_bg_type {
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IB_T10DIF_CRC,
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IB_T10DIF_CSUM,
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};
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/**
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* struct ib_t10_dif_domain - Parameters specific for T10-DIF
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* domain.
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* @bg_type: T10-DIF block guard type (CRC|CSUM)
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* @pi_interval: protection information interval.
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* @bg: seed of guard computation.
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* @app_tag: application tag of guard block
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* @ref_tag: initial guard block reference tag.
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* @ref_remap: Indicate wethear the reftag increments each block
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* @app_escape: Indicate to skip block check if apptag=0xffff
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* @ref_escape: Indicate to skip block check if reftag=0xffffffff
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* @apptag_check_mask: check bitmask of application tag.
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*/
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struct ib_t10_dif_domain {
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enum ib_t10_dif_bg_type bg_type;
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u16 pi_interval;
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u16 bg;
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u16 app_tag;
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u32 ref_tag;
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bool ref_remap;
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bool app_escape;
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bool ref_escape;
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u16 apptag_check_mask;
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};
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/**
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* struct ib_sig_domain - Parameters for signature domain
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* @sig_type: specific signauture type
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* @sig: union of all signature domain attributes that may
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* be used to set domain layout.
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*/
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struct ib_sig_domain {
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enum ib_signature_type sig_type;
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union {
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struct ib_t10_dif_domain dif;
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} sig;
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};
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/**
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* struct ib_sig_attrs - Parameters for signature handover operation
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* @check_mask: bitmask for signature byte check (8 bytes)
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* @mem: memory domain layout descriptor.
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* @wire: wire domain layout descriptor.
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* @meta_length: metadata length
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*/
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struct ib_sig_attrs {
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u8 check_mask;
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struct ib_sig_domain mem;
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struct ib_sig_domain wire;
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int meta_length;
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};
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enum ib_sig_err_type {
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IB_SIG_BAD_GUARD,
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IB_SIG_BAD_REFTAG,
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IB_SIG_BAD_APPTAG,
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};
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/*
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* Signature check masks (8 bytes in total) according to the T10-PI standard:
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* -------- -------- ------------
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* | GUARD | APPTAG | REFTAG |
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* | 2B | 2B | 4B |
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* -------- -------- ------------
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*/
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enum {
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IB_SIG_CHECK_GUARD = 0xc0,
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IB_SIG_CHECK_APPTAG = 0x30,
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IB_SIG_CHECK_REFTAG = 0x0f,
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};
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/*
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* struct ib_sig_err - signature error descriptor
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*/
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struct ib_sig_err {
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enum ib_sig_err_type err_type;
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u32 expected;
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u32 actual;
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u64 sig_err_offset;
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u32 key;
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};
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#endif /* _RDMA_SIGNATURE_H_ */
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