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alistair23-linux/include/linux/nvme-fc.h
James Smart 9c5358e15c nvme-fc: revise TRADDR parsing 
The FC-NVME spec hasn't locked down on the format string for TRADDR.
Currently the spec is lobbying for "nn-<16hexdigits>:pn-<16hexdigits>"
where the wwn's are hex values but not prefixed by 0x.

Most implementations so far expect a string format of
"nn-0x<16hexdigits>:pn-0x<16hexdigits>" to be used. The transport
uses the match_u64 parser which requires a leading 0x prefix to set
the base properly. If it's not there, a match will either fail or return
a base 10 value.

The resolution in T11 is pushing out. Therefore, to fix things now and
to cover any eventuality and any implementations already in the field,
this patch adds support for both formats.

The change consists of replacing the token matching routine with a
routine that validates the fixed string format, and then builds
a local copy of the hex name with a 0x prefix before calling
the system parser.

Note: the same parser routine exists in both the initiator and target
transports. Given this is about the only "shared" item, we chose to
replicate rather than create an interdendency on some shared code.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2017-07-25 18:05:25 +02:00

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/*
* Copyright (c) 2016 Avago Technologies. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful.
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
* THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
* See the GNU General Public License for more details, a copy of which
* can be found in the file COPYING included with this package
*
*/
/*
* This file contains definitions relative to FC-NVME r1.14 (16-020vB).
* The fcnvme_lsdesc_cr_assoc_cmd struct reflects expected r1.16 content.
*/
#ifndef _NVME_FC_H
#define _NVME_FC_H 1
#define NVME_CMD_SCSI_ID 0xFD
#define NVME_CMD_FC_ID FC_TYPE_NVME
/* FC-NVME Cmd IU Flags */
#define FCNVME_CMD_FLAGS_DIRMASK 0x03
#define FCNVME_CMD_FLAGS_WRITE 0x01
#define FCNVME_CMD_FLAGS_READ 0x02
struct nvme_fc_cmd_iu {
__u8 scsi_id;
__u8 fc_id;
__be16 iu_len;
__u8 rsvd4[3];
__u8 flags;
__be64 connection_id;
__be32 csn;
__be32 data_len;
struct nvme_command sqe;
__be32 rsvd88[2];
};
#define NVME_FC_SIZEOF_ZEROS_RSP 12
enum {
FCNVME_SC_SUCCESS = 0,
FCNVME_SC_INVALID_FIELD = 1,
FCNVME_SC_INVALID_CONNID = 2,
};
struct nvme_fc_ersp_iu {
__u8 status_code;
__u8 rsvd1;
__be16 iu_len;
__be32 rsn;
__be32 xfrd_len;
__be32 rsvd12;
struct nvme_completion cqe;
/* for now - no additional payload */
};
/* FC-NVME Link Services */
enum {
FCNVME_LS_RSVD = 0,
FCNVME_LS_RJT = 1,
FCNVME_LS_ACC = 2,
FCNVME_LS_CREATE_ASSOCIATION = 3,
FCNVME_LS_CREATE_CONNECTION = 4,
FCNVME_LS_DISCONNECT = 5,
};
/* FC-NVME Link Service Descriptors */
enum {
FCNVME_LSDESC_RSVD = 0x0,
FCNVME_LSDESC_RQST = 0x1,
FCNVME_LSDESC_RJT = 0x2,
FCNVME_LSDESC_CREATE_ASSOC_CMD = 0x3,
FCNVME_LSDESC_CREATE_CONN_CMD = 0x4,
FCNVME_LSDESC_DISCONN_CMD = 0x5,
FCNVME_LSDESC_CONN_ID = 0x6,
FCNVME_LSDESC_ASSOC_ID = 0x7,
};
/* ********** start of Link Service Descriptors ********** */
/*
* fills in length of a descriptor. Struture minus descriptor header
*/
static inline __be32 fcnvme_lsdesc_len(size_t sz)
{
return cpu_to_be32(sz - (2 * sizeof(u32)));
}
struct fcnvme_ls_rqst_w0 {
u8 ls_cmd; /* FCNVME_LS_xxx */
u8 zeros[3];
};
/* FCNVME_LSDESC_RQST */
struct fcnvme_lsdesc_rqst {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
struct fcnvme_ls_rqst_w0 w0;
__be32 rsvd12;
};
/* FC-NVME LS RJT reason_code values */
enum fcnvme_ls_rjt_reason {
FCNVME_RJT_RC_NONE = 0,
/* no reason - not to be sent */
FCNVME_RJT_RC_INVAL = 0x01,
/* invalid NVMe_LS command code */
FCNVME_RJT_RC_LOGIC = 0x03,
/* logical error */
FCNVME_RJT_RC_UNAB = 0x09,
/* unable to perform command request */
FCNVME_RJT_RC_UNSUP = 0x0b,
/* command not supported */
FCNVME_RJT_RC_INPROG = 0x0e,
/* command already in progress */
FCNVME_RJT_RC_INV_ASSOC = 0x40,
/* Invalid Association ID*/
FCNVME_RJT_RC_INV_CONN = 0x41,
/* Invalid Connection ID*/
FCNVME_RJT_RC_VENDOR = 0xff,
/* vendor specific error */
};
/* FC-NVME LS RJT reason_explanation values */
enum fcnvme_ls_rjt_explan {
FCNVME_RJT_EXP_NONE = 0x00,
/* No additional explanation */
FCNVME_RJT_EXP_OXID_RXID = 0x17,
/* invalid OX_ID-RX_ID combination */
FCNVME_RJT_EXP_INSUF_RES = 0x29,
/* insufficient resources */
FCNVME_RJT_EXP_UNAB_DATA = 0x2a,
/* unable to supply requested data */
FCNVME_RJT_EXP_INV_LEN = 0x2d,
/* Invalid payload length */
};
/* FCNVME_LSDESC_RJT */
struct fcnvme_lsdesc_rjt {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
u8 rsvd8;
/*
* Reject reason and explanaction codes are generic
* to ELs's from LS-3.
*/
u8 reason_code; /* fcnvme_ls_rjt_reason */
u8 reason_explanation; /* fcnvme_ls_rjt_explan */
u8 vendor;
__be32 rsvd12;
};
#define FCNVME_ASSOC_HOSTNQN_LEN 256
#define FCNVME_ASSOC_SUBNQN_LEN 256
/* FCNVME_LSDESC_CREATE_ASSOC_CMD */
struct fcnvme_lsdesc_cr_assoc_cmd {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
__be16 ersp_ratio;
__be16 rsvd10;
__be32 rsvd12[9];
__be16 cntlid;
__be16 sqsize;
__be32 rsvd52;
uuid_t hostid;
u8 hostnqn[FCNVME_ASSOC_HOSTNQN_LEN];
u8 subnqn[FCNVME_ASSOC_SUBNQN_LEN];
__be32 rsvd584[108]; /* pad to 1016 bytes,
* which makes overall LS rqst
* payload 1024 bytes
*/
};
#define FCNVME_LSDESC_CRA_CMD_DESC_MINLEN \
offsetof(struct fcnvme_lsdesc_cr_assoc_cmd, rsvd584)
#define FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN \
(FCNVME_LSDESC_CRA_CMD_DESC_MINLEN - \
offsetof(struct fcnvme_lsdesc_cr_assoc_cmd, ersp_ratio))
/* FCNVME_LSDESC_CREATE_CONN_CMD */
struct fcnvme_lsdesc_cr_conn_cmd {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
__be16 ersp_ratio;
__be16 rsvd10;
__be32 rsvd12[9];
__be16 qid;
__be16 sqsize;
__be32 rsvd52;
};
/* Disconnect Scope Values */
enum {
FCNVME_DISCONN_ASSOCIATION = 0,
FCNVME_DISCONN_CONNECTION = 1,
};
/* FCNVME_LSDESC_DISCONN_CMD */
struct fcnvme_lsdesc_disconn_cmd {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
u8 rsvd8[3];
/* note: scope is really a 1 bit field */
u8 scope; /* FCNVME_DISCONN_xxx */
__be32 rsvd12;
__be64 id;
};
/* FCNVME_LSDESC_CONN_ID */
struct fcnvme_lsdesc_conn_id {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
__be64 connection_id;
};
/* FCNVME_LSDESC_ASSOC_ID */
struct fcnvme_lsdesc_assoc_id {
__be32 desc_tag; /* FCNVME_LSDESC_xxx */
__be32 desc_len;
__be64 association_id;
};
/* r_ctl values */
enum {
FCNVME_RS_RCTL_DATA = 1,
FCNVME_RS_RCTL_XFER_RDY = 5,
FCNVME_RS_RCTL_RSP = 8,
};
/* ********** start of Link Services ********** */
/* FCNVME_LS_RJT */
struct fcnvme_ls_rjt {
struct fcnvme_ls_rqst_w0 w0;
__be32 desc_list_len;
struct fcnvme_lsdesc_rqst rqst;
struct fcnvme_lsdesc_rjt rjt;
};
/* FCNVME_LS_ACC */
struct fcnvme_ls_acc_hdr {
struct fcnvme_ls_rqst_w0 w0;
__be32 desc_list_len;
struct fcnvme_lsdesc_rqst rqst;
/* Followed by cmd-specific ACC descriptors, see next definitions */
};
/* FCNVME_LS_CREATE_ASSOCIATION */
struct fcnvme_ls_cr_assoc_rqst {
struct fcnvme_ls_rqst_w0 w0;
__be32 desc_list_len;
struct fcnvme_lsdesc_cr_assoc_cmd assoc_cmd;
};
#define FCNVME_LSDESC_CRA_RQST_MINLEN \
(offsetof(struct fcnvme_ls_cr_assoc_rqst, assoc_cmd) + \
FCNVME_LSDESC_CRA_CMD_DESC_MINLEN)
#define FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN \
FCNVME_LSDESC_CRA_CMD_DESC_MINLEN
struct fcnvme_ls_cr_assoc_acc {
struct fcnvme_ls_acc_hdr hdr;
struct fcnvme_lsdesc_assoc_id associd;
struct fcnvme_lsdesc_conn_id connectid;
};
/* FCNVME_LS_CREATE_CONNECTION */
struct fcnvme_ls_cr_conn_rqst {
struct fcnvme_ls_rqst_w0 w0;
__be32 desc_list_len;
struct fcnvme_lsdesc_assoc_id associd;
struct fcnvme_lsdesc_cr_conn_cmd connect_cmd;
};
struct fcnvme_ls_cr_conn_acc {
struct fcnvme_ls_acc_hdr hdr;
struct fcnvme_lsdesc_conn_id connectid;
};
/* FCNVME_LS_DISCONNECT */
struct fcnvme_ls_disconnect_rqst {
struct fcnvme_ls_rqst_w0 w0;
__be32 desc_list_len;
struct fcnvme_lsdesc_assoc_id associd;
struct fcnvme_lsdesc_disconn_cmd discon_cmd;
};
struct fcnvme_ls_disconnect_acc {
struct fcnvme_ls_acc_hdr hdr;
};
/*
* Yet to be defined in FC-NVME:
*/
#define NVME_FC_CONNECT_TIMEOUT_SEC 2 /* 2 seconds */
#define NVME_FC_LS_TIMEOUT_SEC 2 /* 2 seconds */
#define NVME_FC_TGTOP_TIMEOUT_SEC 2 /* 2 seconds */
/*
* TRADDR string must be of form "nn-<16hexdigits>:pn-<16hexdigits>"
* the string is allowed to be specified with or without a "0x" prefix
* infront of the <16hexdigits>. Without is considered the "min" string
* and with is considered the "max" string. The hexdigits may be upper
* or lower case.
*/
#define NVME_FC_TRADDR_NNLEN 3 /* "?n-" */
#define NVME_FC_TRADDR_OXNNLEN 5 /* "?n-0x" */
#define NVME_FC_TRADDR_HEXNAMELEN 16
#define NVME_FC_TRADDR_MINLENGTH \
(2 * (NVME_FC_TRADDR_NNLEN + NVME_FC_TRADDR_HEXNAMELEN) + 1)
#define NVME_FC_TRADDR_MAXLENGTH \
(2 * (NVME_FC_TRADDR_OXNNLEN + NVME_FC_TRADDR_HEXNAMELEN) + 1)
#define NVME_FC_TRADDR_MIN_PN_OFFSET \
(NVME_FC_TRADDR_NNLEN + NVME_FC_TRADDR_HEXNAMELEN + 1)
#define NVME_FC_TRADDR_MAX_PN_OFFSET \
(NVME_FC_TRADDR_OXNNLEN + NVME_FC_TRADDR_HEXNAMELEN + 1)
#endif /* _NVME_FC_H */
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