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/* 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
enum nvme_tcp_pfv {
NVME_TCP_PFV_1_0 = 0x0,
};
enum nvme_tcp_fatal_error_status {
NVME_TCP_FES_INVALID_PDU_HDR = 0x01,
NVME_TCP_FES_PDU_SEQ_ERR = 0x02,
NVME_TCP_FES_HDR_DIGEST_ERR = 0x03,
NVME_TCP_FES_DATA_OUT_OF_RANGE = 0x04,
NVME_TCP_FES_R2T_LIMIT_EXCEEDED = 0x05,
NVME_TCP_FES_DATA_LIMIT_EXCEEDED = 0x05,
NVME_TCP_FES_UNSUPPORTED_PARAM = 0x06,
};
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 = 0x0,
nvme_tcp_icresp = 0x1,
nvme_tcp_h2c_term = 0x2,
nvme_tcp_c2h_term = 0x3,
nvme_tcp_cmd = 0x4,
nvme_tcp_rsp = 0x5,
nvme_tcp_h2c_data = 0x6,
nvme_tcp_c2h_data = 0x7,
nvme_tcp_r2t = 0x9,
};
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;
__le32 fei;
__u8 rsvd[8];
};
/**
* 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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