nvme-tcp: Add protocol header

Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/include/linux/nvme-tcp.h b/include/linux/nvme-tcp.h
new file mode 100644 (file)
index 0000000..03d87c0
--- /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 88812cb15be0a764763f8dfa95afd9f28205748b..4d7907e3771e20325b6f7da17b895be7f3e7d503 100644 (file)
--- 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,
 };