/* SPDX-License-Identifier: GPL-2.0 */
/*
* NVMe over Fabrics TCP protocol header .
* Copyright ( c ) 2018 Lightbits Labs . All rights reserved .
*/
#ifndef _LINUX_NVME_TCP_H
#define _LINUX_NVME_TCP_H
#include <linux/nvme.h>
#define NVME_TCP_DISC_PORT 8009
#define NVME_TCP_ADMIN_CCSZ SZ_8K
#define NVME_TCP_DIGEST_LENGTH 4
#define NVME_TCP_MIN_MAXH2CDATA 4096
#define NVME_TCP_MIN_C2HTERM_PLEN 24
#define NVME_TCP_MAX_C2HTERM_PLEN 152
enum nvme_tcp_pfv {
NVME_TCP_PFV_1_0 = 0 x0,
};
enum nvme_tcp_tls_cipher {
NVME_TCP_TLS_CIPHER_INVALID = 0 ,
NVME_TCP_TLS_CIPHER_SHA256 = 1 ,
NVME_TCP_TLS_CIPHER_SHA384 = 2 ,
};
enum nvme_tcp_fatal_error_status {
NVME_TCP_FES_INVALID_PDU_HDR = 0 x01,
NVME_TCP_FES_PDU_SEQ_ERR = 0 x02,
NVME_TCP_FES_HDR_DIGEST_ERR = 0 x03,
NVME_TCP_FES_DATA_OUT_OF_RANGE = 0 x04,
NVME_TCP_FES_R2T_LIMIT_EXCEEDED = 0 x05,
NVME_TCP_FES_DATA_LIMIT_EXCEEDED = 0 x05,
NVME_TCP_FES_UNSUPPORTED_PARAM = 0 x06,
};
enum nvme_tcp_digest_option {
NVME_TCP_HDR_DIGEST_ENABLE = (1 << 0 ),
NVME_TCP_DATA_DIGEST_ENABLE = (1 << 1 ),
};
enum nvme_tcp_pdu_type {
nvme_tcp_icreq = 0 x0,
nvme_tcp_icresp = 0 x1,
nvme_tcp_h2c_term = 0 x2,
nvme_tcp_c2h_term = 0 x3,
nvme_tcp_cmd = 0 x4,
nvme_tcp_rsp = 0 x5,
nvme_tcp_h2c_data = 0 x6,
nvme_tcp_c2h_data = 0 x7,
nvme_tcp_r2t = 0 x9,
};
enum nvme_tcp_pdu_flags {
NVME_TCP_F_HDGST = (1 << 0 ),
NVME_TCP_F_DDGST = (1 << 1 ),
NVME_TCP_F_DATA_LAST = (1 << 2 ),
NVME_TCP_F_DATA_SUCCESS = (1 << 3 ),
};
/**
* struct nvme_tcp_hdr - nvme tcp pdu common header
*
* @ type : pdu type
* @ flags : pdu specific flags
* @ hlen : pdu header length
* @ pdo : pdu data offset
* @ plen : pdu wire byte length
*/
struct nvme_tcp_hdr {
__u8 type;
__u8 flags;
__u8 hlen;
__u8 pdo;
__le32 plen;
};
/**
* struct nvme_tcp_icreq_pdu - nvme tcp initialize connection request pdu
*
* @ hdr : pdu generic header
* @ pfv : pdu version format
* @ hpda : host pdu data alignment ( dwords , 0 ' s based )
* @ digest : digest types enabled
* @ maxr2t : maximum r2ts per request supported
*/
struct nvme_tcp_icreq_pdu {
struct nvme_tcp_hdr hdr;
__le16 pfv;
__u8 hpda;
__u8 digest;
__le32 maxr2t;
__u8 rsvd2[112 ];
};
/**
* struct nvme_tcp_icresp_pdu - nvme tcp initialize connection response pdu
*
* @ hdr : pdu common header
* @ pfv : pdu version format
* @ cpda : controller pdu data alignment ( dowrds , 0 ' s based )
* @ digest : digest types enabled
* @ maxdata : maximum data capsules per r2t supported
*/
struct nvme_tcp_icresp_pdu {
struct nvme_tcp_hdr hdr;
__le16 pfv;
__u8 cpda;
__u8 digest;
__le32 maxdata;
__u8 rsvd[112 ];
};
/**
* struct nvme_tcp_term_pdu - nvme tcp terminate connection pdu
*
* @ hdr : pdu common header
* @ fes : fatal error status
* @ fei : fatal error information
*/
struct nvme_tcp_term_pdu {
struct nvme_tcp_hdr hdr;
__le16 fes;
__le16 feil;
__le16 feiu;
__u8 rsvd[10 ];
};
/**
* struct nvme_tcp_cmd_pdu - nvme tcp command capsule pdu
*
* @ hdr : pdu common header
* @ cmd : nvme command
*/
struct nvme_tcp_cmd_pdu {
struct nvme_tcp_hdr hdr;
struct nvme_command cmd;
};
/**
* struct nvme_tcp_rsp_pdu - nvme tcp response capsule pdu
*
* @ hdr : pdu common header
* @ hdr : nvme - tcp generic header
* @ cqe : nvme completion queue entry
*/
struct nvme_tcp_rsp_pdu {
struct nvme_tcp_hdr hdr;
struct nvme_completion cqe;
};
/**
* struct nvme_tcp_r2t_pdu - nvme tcp ready - to - transfer pdu
*
* @ hdr : pdu common header
* @ command_id : nvme command identifier which this relates to
* @ ttag : transfer tag ( controller generated )
* @ r2t_offset : offset from the start of the command data
* @ r2t_length : length the host is allowed to send
*/
struct nvme_tcp_r2t_pdu {
struct nvme_tcp_hdr hdr;
__u16 command_id;
__u16 ttag;
__le32 r2t_offset;
__le32 r2t_length;
__u8 rsvd[4 ];
};
/**
* struct nvme_tcp_data_pdu - nvme tcp data pdu
*
* @ hdr : pdu common header
* @ command_id : nvme command identifier which this relates to
* @ ttag : transfer tag ( controller generated )
* @ data_offset : offset from the start of the command data
* @ data_length : length of the data stream
*/
struct nvme_tcp_data_pdu {
struct nvme_tcp_hdr hdr;
__u16 command_id;
__u16 ttag;
__le32 data_offset;
__le32 data_length;
__u8 rsvd[4 ];
};
union nvme_tcp_pdu {
struct nvme_tcp_icreq_pdu icreq;
struct nvme_tcp_icresp_pdu icresp;
struct nvme_tcp_cmd_pdu cmd;
struct nvme_tcp_rsp_pdu rsp;
struct nvme_tcp_r2t_pdu r2t;
struct nvme_tcp_data_pdu data;
};
#endif /* _LINUX_NVME_TCP_H */
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