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Subject[PATCH v5 10/13] nvme-tcp: Add protocol header
Date
From: Sagi Grimberg <sagi@lightbitslabs.com>

Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
---
include/linux/nvme-tcp.h | 189 +++++++++++++++++++++++++++++++++++++++
include/linux/nvme.h | 1 +
2 files changed, 190 insertions(+)
create mode 100644 include/linux/nvme-tcp.h

diff --git a/include/linux/nvme-tcp.h b/include/linux/nvme-tcp.h
new file mode 100644
index 000000000000..03d87c0550a9
--- /dev/null
+++ b/include/linux/nvme-tcp.h
@@ -0,0 +1,189 @@
+// 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 */
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 88812cb15be0..4d7907e3771e 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -52,6 +52,7 @@ enum {
enum {
NVMF_TRTYPE_RDMA = 1, /* RDMA */
NVMF_TRTYPE_FC = 2, /* Fibre Channel */
+ NVMF_TRTYPE_TCP = 3, /* TCP/IP */
NVMF_TRTYPE_LOOP = 254, /* Reserved for host usage */
NVMF_TRTYPE_MAX,
};
--
2.17.1
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