drivers/crypto/cavium/nitrox/nitrox_req.h - arm/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __NITROX_REQ_H
 #define __NITROX_REQ_H

 #include <linux/dma-mapping.h>
 #include <crypto/aes.h>

 #include "nitrox_dev.h"

 /**
  * struct gphdr - General purpose Header
  * @param0: first parameter.
  * @param1: second parameter.
  * @param2: third parameter.
  * @param3: fourth parameter.
  *
  * Params tell the iv and enc/dec data offsets.
  */
 struct gphdr {
 	__be16 param0;
 	__be16 param1;
 	__be16 param2;
 	__be16 param3;
 };

 /**
  * struct se_req_ctrl - SE request information.
  * @arg: Minor number of the opcode
  * @ctxc: Context control.
  * @unca: Uncertainity enabled.
  * @info: Additional information for SE cores.
  * @ctxl: Context length in bytes.
  * @uddl: User defined data length
  */
 union se_req_ctrl {
 	u64 value;
 	struct {
 		u64 raz	: 22;
 		u64 arg	: 8;
 		u64 ctxc : 2;
 		u64 unca : 1;
 		u64 info : 3;
 		u64 unc : 8;
 		u64 ctxl : 12;
 		u64 uddl : 8;
 	} s;
 };

 struct nitrox_sglist {
 	u16 len;
 	u16 raz0;
 	u32 raz1;
 	dma_addr_t dma;
 };

 #define MAX_IV_LEN 16

 /**
  * struct se_crypto_request - SE crypto request structure.
  * @opcode: Request opcode (enc/dec)
  * @flags: flags from crypto subsystem
  * @ctx_handle: Crypto context handle.
  * @gph: GP Header
  * @ctrl: Request Information.
  * @in: Input sglist
  * @out: Output sglist
  */
 struct se_crypto_request {
 	u8 opcode;
 	gfp_t gfp;
 	u32 flags;
 	u64 ctx_handle;

 	struct gphdr gph;
 	union se_req_ctrl ctrl;

 	u8 iv[MAX_IV_LEN];
 	u16 ivsize;

 	struct scatterlist *src;
 	struct scatterlist *dst;
 };

 /* Crypto opcodes */
 #define FLEXI_CRYPTO_ENCRYPT_HMAC	0x33
 #define ENCRYPT	0
 #define DECRYPT 1

 /* IV from context */
 #define IV_FROM_CTX	0
 /* IV from Input data */
 #define IV_FROM_DPTR	1

 /**
  * cipher opcodes for firmware
  */
 enum flexi_cipher {
 	CIPHER_NULL = 0,
 	CIPHER_3DES_CBC,
 	CIPHER_3DES_ECB,
 	CIPHER_AES_CBC,
 	CIPHER_AES_ECB,
 	CIPHER_AES_CFB,
 	CIPHER_AES_CTR,
 	CIPHER_AES_GCM,
 	CIPHER_AES_XTS,
 	CIPHER_AES_CCM,
 	CIPHER_AES_CBC_CTS,
 	CIPHER_AES_ECB_CTS,
 	CIPHER_INVALID
 };

 /**
  * struct crypto_keys - Crypto keys
  * @key: Encryption key or KEY1 for AES-XTS
  * @iv: Encryption IV or Tweak for AES-XTS
  */
 struct crypto_keys {
 	union {
 		u8 key[AES_MAX_KEY_SIZE];
 		u8 key1[AES_MAX_KEY_SIZE];
 	} u;
 	u8 iv[AES_BLOCK_SIZE];
 };

 /**
  * struct auth_keys - Authentication keys
  * @ipad: IPAD or KEY2 for AES-XTS
  * @opad: OPAD or AUTH KEY if auth_input_type = 1
  */
 struct auth_keys {
 	union {
 		u8 ipad[64];
 		u8 key2[64];
 	} u;
 	u8 opad[64];
 };

 /**
  * struct flexi_crypto_context - Crypto context
  * @cipher_type: Encryption cipher type
  * @aes_keylen: AES key length
  * @iv_source: Encryption IV source
  * @hash_type: Authentication type
  * @auth_input_type: Authentication input type
  *   1 - Authentication IV and KEY, microcode calculates OPAD/IPAD
  *   0 - Authentication OPAD/IPAD
  * @mac_len: mac length
  * @crypto: Crypto keys
  * @auth: Authentication keys
  */
 struct flexi_crypto_context {
 	union {
 		__be64 flags;
 		struct {
 #if defined(__BIG_ENDIAN_BITFIELD)
 			u64 cipher_type	: 4;
 			u64 reserved_59	: 1;
 			u64 aes_keylen : 2;
 			u64 iv_source : 1;
 			u64 hash_type : 4;
 			u64 reserved_49_51 : 3;
 			u64 auth_input_type: 1;
 			u64 mac_len : 8;
 			u64 reserved_0_39 : 40;
 #else
 			u64 reserved_0_39 : 40;
 			u64 mac_len : 8;
 			u64 auth_input_type: 1;
 			u64 reserved_49_51 : 3;
 			u64 hash_type : 4;
 			u64 iv_source : 1;
 			u64 aes_keylen : 2;
 			u64 reserved_59	: 1;
 			u64 cipher_type	: 4;
 #endif
 		} w0;
 	};

 	struct crypto_keys crypto;
 	struct auth_keys auth;
 };

 struct nitrox_crypto_ctx {
 	struct nitrox_device *ndev;
 	union {
 		u64 ctx_handle;
 		struct flexi_crypto_context *fctx;
 	} u;
 };

 struct nitrox_kcrypt_request {
 	struct se_crypto_request creq;
 	struct nitrox_crypto_ctx *nctx;
 	struct skcipher_request *skreq;
 };

 /**
  * struct pkt_instr_hdr - Packet Instruction Header
  * @g: Gather used
  *   When [G] is set and [GSZ] != 0, the instruction is
  *   indirect gather instruction.
  *   When [G] is set and [GSZ] = 0, the instruction is
  *   direct gather instruction.
  * @gsz: Number of pointers in the indirect gather list
  * @ihi: When set hardware duplicates the 1st 8 bytes of pkt_instr_hdr
  *   and adds them to the packet after the pkt_instr_hdr but before any UDD
  * @ssz: Not used by the input hardware. But can become slc_store_int[SSZ]
  *   when [IHI] is set.
  * @fsz: The number of front data bytes directly included in the
  *   PCIe instruction.
  * @tlen: The length of the input packet in bytes, include:
  *   - 16B pkt_hdr
  *   - Inline context bytes if any,
  *   - UDD if any,
  *   - packet payload bytes
  */
 union pkt_instr_hdr {
 	u64 value;
 	struct {
 #if defined(__BIG_ENDIAN_BITFIELD)
 		u64 raz_48_63 : 16;
 		u64 g : 1;
 		u64 gsz	: 7;
 		u64 ihi	: 1;
 		u64 ssz	: 7;
 		u64 raz_30_31 : 2;
 		u64 fsz	: 6;
 		u64 raz_16_23 : 8;
 		u64 tlen : 16;
 #else
 		u64 tlen : 16;
 		u64 raz_16_23 : 8;
 		u64 fsz	: 6;
 		u64 raz_30_31 : 2;
 		u64 ssz	: 7;
 		u64 ihi	: 1;
 		u64 gsz	: 7;
 		u64 g : 1;
 		u64 raz_48_63 : 16;
 #endif
 	} s;
 };

 /**
  * struct pkt_hdr - Packet Input Header
  * @opcode: Request opcode (Major)
  * @arg: Request opcode (Minor)
  * @ctxc: Context control.
  * @unca: When set [UNC] is the uncertainty count for an input packet.
  *        The hardware uses uncertainty counts to predict
  *        output buffer use and avoid deadlock.
  * @info: Not used by input hardware. Available for use
  *        during SE processing.
  * @destport: The expected destination port/ring/channel for the packet.
  * @unc: Uncertainty count for an input packet.
  * @grp: SE group that will process the input packet.
  * @ctxl: Context Length in 64-bit words.
  * @uddl: User-defined data (UDD) length in bytes.
  * @ctxp: Context pointer. CTXP<63,2:0> must be zero in all cases.
  */
 union pkt_hdr {
 	u64 value[2];
 	struct {
 #if defined(__BIG_ENDIAN_BITFIELD)
 		u64 opcode : 8;
 		u64 arg	: 8;
 		u64 ctxc : 2;
 		u64 unca : 1;
 		u64 raz_44 : 1;
 		u64 info : 3;
 		u64 destport : 9;
 		u64 unc	: 8;
 		u64 raz_19_23 : 5;
 		u64 grp	: 3;
 		u64 raz_15 : 1;
 		u64 ctxl : 7;
 		u64 uddl : 8;
 #else
 		u64 uddl : 8;
 		u64 ctxl : 7;
 		u64 raz_15 : 1;
 		u64 grp	: 3;
 		u64 raz_19_23 : 5;
 		u64 unc	: 8;
 		u64 destport : 9;
 		u64 info : 3;
 		u64 raz_44 : 1;
 		u64 unca : 1;
 		u64 ctxc : 2;
 		u64 arg	: 8;
 		u64 opcode : 8;
 #endif
 		__be64 ctxp;
 	} s;
 };

 /**
  * struct slc_store_info - Solicited Paceket Output Store Information.
  * @ssz: The number of scatterlist pointers for the solicited output port
  *       packet.
  * @rptr: The result pointer for the solicited output port packet.
  *        If [SSZ]=0, [RPTR] must point directly to a buffer on the remote
  *        host that is large enough to hold the entire output packet.
  *        If [SSZ]!=0, [RPTR] must point to an array of ([SSZ]+3)/4
  *        sglist components at [RPTR] on the remote host.
  */
 union slc_store_info {
 	u64 value[2];
 	struct {
 #if defined(__BIG_ENDIAN_BITFIELD)
 		u64 raz_39_63 : 25;
 		u64 ssz	: 7;
 		u64 raz_0_31 : 32;
 #else
 		u64 raz_0_31 : 32;
 		u64 ssz	: 7;
 		u64 raz_39_63 : 25;
 #endif
 		__be64 rptr;
 	} s;
 };

 /**
  * struct nps_pkt_instr - NPS Packet Instruction of SE cores.
  * @dptr0 : Input pointer points to buffer in remote host.
  * @ih: Packet Instruction Header (8 bytes)
  * @irh: Packet Input Header (16 bytes)
  * @slc: Solicited Packet Output Store Information (16 bytes)
  * @fdata: Front data
  *
  * 64-Byte Instruction Format
  */
 struct nps_pkt_instr {
 	__be64 dptr0;
 	union pkt_instr_hdr ih;
 	union pkt_hdr irh;
 	union slc_store_info slc;
 	u64 fdata[2];
 };

 /**
  * struct ctx_hdr - Book keeping data about the crypto context
  * @pool: Pool used to allocate crypto context
  * @dma: Base DMA address of the cypto context
  * @ctx_dma: Actual usable crypto context for NITROX
  */
 struct ctx_hdr {
 	struct dma_pool *pool;
 	dma_addr_t dma;
 	dma_addr_t ctx_dma;
 };

 /*
  * struct sglist_component - SG list component format
  * @len0: The number of bytes at [PTR0] on the remote host.
  * @len1: The number of bytes at [PTR1] on the remote host.
  * @len2: The number of bytes at [PTR2] on the remote host.
  * @len3: The number of bytes at [PTR3] on the remote host.
  * @dma0: First pointer point to buffer in remote host.
  * @dma1: Second pointer point to buffer in remote host.
  * @dma2: Third pointer point to buffer in remote host.
  * @dma3: Fourth pointer point to buffer in remote host.
  */
 struct nitrox_sgcomp {
 	__be16 len[4];
 	__be64 dma[4];
 };

 /*
  * strutct nitrox_sgtable - SG list information
  * @map_cnt: Number of buffers mapped
  * @nr_comp: Number of sglist components
  * @total_bytes: Total bytes in sglist.
  * @len: Total sglist components length.
  * @dma: DMA address of sglist component.
  * @dir: DMA direction.
  * @buf: crypto request buffer.
  * @sglist: SG list of input/output buffers.
  * @sgcomp: sglist component for NITROX.
  */
 struct nitrox_sgtable {
 	u8 map_bufs_cnt;
 	u8 nr_sgcomp;
 	u16 total_bytes;
 	u32 len;
 	dma_addr_t dma;
 	enum dma_data_direction dir;

 	struct scatterlist *buf;
 	struct nitrox_sglist *sglist;
 	struct nitrox_sgcomp *sgcomp;
 };

 /* Response Header Length */
 #define ORH_HLEN	8
 /* Completion bytes Length */
 #define COMP_HLEN	8

 struct resp_hdr {
 	u64 orh;
 	dma_addr_t orh_dma;
 	u64 completion;
 	dma_addr_t completion_dma;
 };

 typedef void (*completion_t)(struct skcipher_request *skreq, int err);

 /**
  * struct nitrox_softreq - Represents the NIROX Request.
  * @response: response list entry
  * @backlog: Backlog list entry
  * @ndev: Device used to submit the request
  * @cmdq: Command queue for submission
  * @resp: Response headers
  * @instr: 64B instruction
  * @in: SG table for input
  * @out SG table for output
  * @tstamp: Request submitted time in jiffies
  * @callback: callback after request completion/timeout
  * @cb_arg: callback argument
  */
 struct nitrox_softreq {
 	struct list_head response;
 	struct list_head backlog;

 	u32 flags;
 	gfp_t gfp;
 	atomic_t status;
 	bool inplace;

 	struct nitrox_device *ndev;
 	struct nitrox_cmdq *cmdq;

 	struct nps_pkt_instr instr;
 	struct resp_hdr resp;
 	struct nitrox_sgtable in;
 	struct nitrox_sgtable out;

 	unsigned long tstamp;

 	completion_t callback;
 	struct skcipher_request *skreq;
 };

 #endif /* __NITROX_REQ_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef __NITROX_REQ_H
	#define __NITROX_REQ_H

	#include <linux/dma-mapping.h>
	#include <crypto/aes.h>

	#include "nitrox_dev.h"

	/**
	* struct gphdr - General purpose Header
	* @param0: first parameter.
	* @param1: second parameter.
	* @param2: third parameter.
	* @param3: fourth parameter.
	*
	* Params tell the iv and enc/dec data offsets.
	*/
	struct gphdr {
	__be16 param0;
	__be16 param1;
	__be16 param2;
	__be16 param3;
	};

	/**
	* struct se_req_ctrl - SE request information.
	* @arg: Minor number of the opcode
	* @ctxc: Context control.
	* @unca: Uncertainity enabled.
	* @info: Additional information for SE cores.
	* @ctxl: Context length in bytes.
	* @uddl: User defined data length
	*/
	union se_req_ctrl {
	u64 value;
	struct {
	u64 raz : 22;
	u64 arg : 8;
	u64 ctxc : 2;
	u64 unca : 1;
	u64 info : 3;
	u64 unc : 8;
	u64 ctxl : 12;
	u64 uddl : 8;
	} s;
	};

	struct nitrox_sglist {
	u16 len;
	u16 raz0;
	u32 raz1;
	dma_addr_t dma;
	};

	#define MAX_IV_LEN 16

	/**
	* struct se_crypto_request - SE crypto request structure.
	* @opcode: Request opcode (enc/dec)
	* @flags: flags from crypto subsystem
	* @ctx_handle: Crypto context handle.
	* @gph: GP Header
	* @ctrl: Request Information.
	* @in: Input sglist
	* @out: Output sglist
	*/
	struct se_crypto_request {
	u8 opcode;
	gfp_t gfp;
	u32 flags;
	u64 ctx_handle;

	struct gphdr gph;
	union se_req_ctrl ctrl;

	u8 iv[MAX_IV_LEN];
	u16 ivsize;

	struct scatterlist *src;
	struct scatterlist *dst;
	};

	/* Crypto opcodes */
	#define FLEXI_CRYPTO_ENCRYPT_HMAC 0x33
	#define ENCRYPT 0
	#define DECRYPT 1

	/* IV from context */
	#define IV_FROM_CTX 0
	/* IV from Input data */
	#define IV_FROM_DPTR 1

	/**
	* cipher opcodes for firmware
	*/
	enum flexi_cipher {
	CIPHER_NULL = 0,
	CIPHER_3DES_CBC,
	CIPHER_3DES_ECB,
	CIPHER_AES_CBC,
	CIPHER_AES_ECB,
	CIPHER_AES_CFB,
	CIPHER_AES_CTR,
	CIPHER_AES_GCM,
	CIPHER_AES_XTS,
	CIPHER_AES_CCM,
	CIPHER_AES_CBC_CTS,
	CIPHER_AES_ECB_CTS,
	CIPHER_INVALID
	};

	/**
	* struct crypto_keys - Crypto keys
	* @key: Encryption key or KEY1 for AES-XTS
	* @iv: Encryption IV or Tweak for AES-XTS
	*/
	struct crypto_keys {
	union {
	u8 key[AES_MAX_KEY_SIZE];
	u8 key1[AES_MAX_KEY_SIZE];
	} u;
	u8 iv[AES_BLOCK_SIZE];
	};

	/**
	* struct auth_keys - Authentication keys
	* @ipad: IPAD or KEY2 for AES-XTS
	* @opad: OPAD or AUTH KEY if auth_input_type = 1
	*/
	struct auth_keys {
	union {
	u8 ipad[64];
	u8 key2[64];
	} u;
	u8 opad[64];
	};

	/**
	* struct flexi_crypto_context - Crypto context
	* @cipher_type: Encryption cipher type
	* @aes_keylen: AES key length
	* @iv_source: Encryption IV source
	* @hash_type: Authentication type
	* @auth_input_type: Authentication input type
	* 1 - Authentication IV and KEY, microcode calculates OPAD/IPAD
	* 0 - Authentication OPAD/IPAD
	* @mac_len: mac length
	* @crypto: Crypto keys
	* @auth: Authentication keys
	*/
	struct flexi_crypto_context {
	union {
	__be64 flags;
	struct {
	#if defined(__BIG_ENDIAN_BITFIELD)
	u64 cipher_type : 4;
	u64 reserved_59 : 1;
	u64 aes_keylen : 2;
	u64 iv_source : 1;
	u64 hash_type : 4;
	u64 reserved_49_51 : 3;
	u64 auth_input_type: 1;
	u64 mac_len : 8;
	u64 reserved_0_39 : 40;
	#else
	u64 reserved_0_39 : 40;
	u64 mac_len : 8;
	u64 auth_input_type: 1;
	u64 reserved_49_51 : 3;
	u64 hash_type : 4;
	u64 iv_source : 1;
	u64 aes_keylen : 2;
	u64 reserved_59 : 1;
	u64 cipher_type : 4;
	#endif
	} w0;
	};

	struct crypto_keys crypto;
	struct auth_keys auth;
	};

	struct nitrox_crypto_ctx {
	struct nitrox_device *ndev;
	union {
	u64 ctx_handle;
	struct flexi_crypto_context *fctx;
	} u;
	};

	struct nitrox_kcrypt_request {
	struct se_crypto_request creq;
	struct nitrox_crypto_ctx *nctx;
	struct skcipher_request *skreq;
	};

	/**
	* struct pkt_instr_hdr - Packet Instruction Header
	* @g: Gather used
	* When [G] is set and [GSZ] != 0, the instruction is
	* indirect gather instruction.
	* When [G] is set and [GSZ] = 0, the instruction is
	* direct gather instruction.
	* @gsz: Number of pointers in the indirect gather list
	* @ihi: When set hardware duplicates the 1st 8 bytes of pkt_instr_hdr
	* and adds them to the packet after the pkt_instr_hdr but before any UDD
	* @ssz: Not used by the input hardware. But can become slc_store_int[SSZ]
	* when [IHI] is set.
	* @fsz: The number of front data bytes directly included in the
	* PCIe instruction.
	* @tlen: The length of the input packet in bytes, include:
	* - 16B pkt_hdr
	* - Inline context bytes if any,
	* - UDD if any,
	* - packet payload bytes
	*/
	union pkt_instr_hdr {
	u64 value;
	struct {
	#if defined(__BIG_ENDIAN_BITFIELD)
	u64 raz_48_63 : 16;
	u64 g : 1;
	u64 gsz : 7;
	u64 ihi : 1;
	u64 ssz : 7;
	u64 raz_30_31 : 2;
	u64 fsz : 6;
	u64 raz_16_23 : 8;
	u64 tlen : 16;
	#else
	u64 tlen : 16;
	u64 raz_16_23 : 8;
	u64 fsz : 6;
	u64 raz_30_31 : 2;
	u64 ssz : 7;
	u64 ihi : 1;
	u64 gsz : 7;
	u64 g : 1;
	u64 raz_48_63 : 16;
	#endif
	} s;
	};

	/**
	* struct pkt_hdr - Packet Input Header
	* @opcode: Request opcode (Major)
	* @arg: Request opcode (Minor)
	* @ctxc: Context control.
	* @unca: When set [UNC] is the uncertainty count for an input packet.
	* The hardware uses uncertainty counts to predict
	* output buffer use and avoid deadlock.
	* @info: Not used by input hardware. Available for use
	* during SE processing.
	* @destport: The expected destination port/ring/channel for the packet.
	* @unc: Uncertainty count for an input packet.
	* @grp: SE group that will process the input packet.
	* @ctxl: Context Length in 64-bit words.
	* @uddl: User-defined data (UDD) length in bytes.
	* @ctxp: Context pointer. CTXP<63,2:0> must be zero in all cases.
	*/
	union pkt_hdr {
	u64 value[2];
	struct {
	#if defined(__BIG_ENDIAN_BITFIELD)
	u64 opcode : 8;
	u64 arg : 8;
	u64 ctxc : 2;
	u64 unca : 1;
	u64 raz_44 : 1;
	u64 info : 3;
	u64 destport : 9;
	u64 unc : 8;
	u64 raz_19_23 : 5;
	u64 grp : 3;
	u64 raz_15 : 1;
	u64 ctxl : 7;
	u64 uddl : 8;
	#else
	u64 uddl : 8;
	u64 ctxl : 7;
	u64 raz_15 : 1;
	u64 grp : 3;
	u64 raz_19_23 : 5;
	u64 unc : 8;
	u64 destport : 9;
	u64 info : 3;
	u64 raz_44 : 1;
	u64 unca : 1;
	u64 ctxc : 2;
	u64 arg : 8;
	u64 opcode : 8;
	#endif
	__be64 ctxp;
	} s;
	};

	/**
	* struct slc_store_info - Solicited Paceket Output Store Information.
	* @ssz: The number of scatterlist pointers for the solicited output port
	* packet.
	* @rptr: The result pointer for the solicited output port packet.
	* If [SSZ]=0, [RPTR] must point directly to a buffer on the remote
	* host that is large enough to hold the entire output packet.
	* If [SSZ]!=0, [RPTR] must point to an array of ([SSZ]+3)/4
	* sglist components at [RPTR] on the remote host.
	*/
	union slc_store_info {
	u64 value[2];
	struct {
	#if defined(__BIG_ENDIAN_BITFIELD)
	u64 raz_39_63 : 25;
	u64 ssz : 7;
	u64 raz_0_31 : 32;
	#else
	u64 raz_0_31 : 32;
	u64 ssz : 7;
	u64 raz_39_63 : 25;
	#endif
	__be64 rptr;
	} s;
	};

	/**
	* struct nps_pkt_instr - NPS Packet Instruction of SE cores.
	* @dptr0 : Input pointer points to buffer in remote host.
	* @ih: Packet Instruction Header (8 bytes)
	* @irh: Packet Input Header (16 bytes)
	* @slc: Solicited Packet Output Store Information (16 bytes)
	* @fdata: Front data
	*
	* 64-Byte Instruction Format
	*/
	struct nps_pkt_instr {
	__be64 dptr0;
	union pkt_instr_hdr ih;
	union pkt_hdr irh;
	union slc_store_info slc;
	u64 fdata[2];
	};

	/**
	* struct ctx_hdr - Book keeping data about the crypto context
	* @pool: Pool used to allocate crypto context
	* @dma: Base DMA address of the cypto context
	* @ctx_dma: Actual usable crypto context for NITROX
	*/
	struct ctx_hdr {
	struct dma_pool *pool;
	dma_addr_t dma;
	dma_addr_t ctx_dma;
	};

	/*
	* struct sglist_component - SG list component format
	* @len0: The number of bytes at [PTR0] on the remote host.
	* @len1: The number of bytes at [PTR1] on the remote host.
	* @len2: The number of bytes at [PTR2] on the remote host.
	* @len3: The number of bytes at [PTR3] on the remote host.
	* @dma0: First pointer point to buffer in remote host.
	* @dma1: Second pointer point to buffer in remote host.
	* @dma2: Third pointer point to buffer in remote host.
	* @dma3: Fourth pointer point to buffer in remote host.
	*/
	struct nitrox_sgcomp {
	__be16 len[4];
	__be64 dma[4];
	};

	/*
	* strutct nitrox_sgtable - SG list information
	* @map_cnt: Number of buffers mapped
	* @nr_comp: Number of sglist components
	* @total_bytes: Total bytes in sglist.
	* @len: Total sglist components length.
	* @dma: DMA address of sglist component.
	* @dir: DMA direction.
	* @buf: crypto request buffer.
	* @sglist: SG list of input/output buffers.
	* @sgcomp: sglist component for NITROX.
	*/
	struct nitrox_sgtable {
	u8 map_bufs_cnt;
	u8 nr_sgcomp;
	u16 total_bytes;
	u32 len;
	dma_addr_t dma;
	enum dma_data_direction dir;

	struct scatterlist *buf;
	struct nitrox_sglist *sglist;
	struct nitrox_sgcomp *sgcomp;
	};

	/* Response Header Length */
	#define ORH_HLEN 8
	/* Completion bytes Length */
	#define COMP_HLEN 8

	struct resp_hdr {
	u64 orh;
	dma_addr_t orh_dma;
	u64 completion;
	dma_addr_t completion_dma;
	};

	typedef void (completion_t)(struct skcipher_request skreq, int err);

	/**
	* struct nitrox_softreq - Represents the NIROX Request.
	* @response: response list entry
	* @backlog: Backlog list entry
	* @ndev: Device used to submit the request
	* @cmdq: Command queue for submission
	* @resp: Response headers
	* @instr: 64B instruction
	* @in: SG table for input
	* @out SG table for output
	* @tstamp: Request submitted time in jiffies
	* @callback: callback after request completion/timeout
	* @cb_arg: callback argument
	*/
	struct nitrox_softreq {
	struct list_head response;
	struct list_head backlog;

	u32 flags;
	gfp_t gfp;
	atomic_t status;
	bool inplace;

	struct nitrox_device *ndev;
	struct nitrox_cmdq *cmdq;

	struct nps_pkt_instr instr;
	struct resp_hdr resp;
	struct nitrox_sgtable in;
	struct nitrox_sgtable out;

	unsigned long tstamp;

	completion_t callback;
	struct skcipher_request *skreq;
	};

	#endif /* __NITROX_REQ_H */