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+.. _fabrics.h:
+
+**fabrics.h**
+
+
+Fabrics-specific definitions.
+
+
+
+.. c:struct:: nvme_fabrics_config
+
+   Defines all linux nvme fabrics initiator options
+
+**Definition**
+
+::
+
+  struct nvme_fabrics_config {
+    char *host_traddr;
+    char *host_iface;
+    int queue_size;
+    int nr_io_queues;
+    int reconnect_delay;
+    int ctrl_loss_tmo;
+    int fast_io_fail_tmo;
+    int keep_alive_tmo;
+    int nr_write_queues;
+    int nr_poll_queues;
+    int tos;
+    bool duplicate_connect;
+    bool disable_sqflow;
+    bool hdr_digest;
+    bool data_digest;
+    bool tls;
+  };
+
+**Members**
+
+``host_traddr``
+  Host transport address
+
+``host_iface``
+  Host interface name
+
+``queue_size``
+  Number of IO queue entries
+
+``nr_io_queues``
+  Number of controller IO queues to establish
+
+``reconnect_delay``
+  Time between two consecutive reconnect attempts.
+
+``ctrl_loss_tmo``
+  Override the default controller reconnect attempt timeout in seconds
+
+``fast_io_fail_tmo``
+  Set the fast I/O fail timeout in seconds.
+
+``keep_alive_tmo``
+  Override the default keep-alive-timeout to this value in seconds
+
+``nr_write_queues``
+  Number of queues to use for exclusively for writing
+
+``nr_poll_queues``
+  Number of queues to reserve for polling completions
+
+``tos``
+  Type of service
+
+``duplicate_connect``
+  Allow multiple connections to the same target
+
+``disable_sqflow``
+  Disable controller sq flow control
+
+``hdr_digest``
+  Generate/verify header digest (TCP)
+
+``data_digest``
+  Generate/verify data digest (TCP)
+
+``tls``
+  Start TLS on the connection (TCP)
+
+
+
+.. c:function:: const char * nvmf_trtype_str (__u8 trtype)
+
+   Decode TRTYPE field
+
+**Parameters**
+
+``__u8 trtype``
+  value to be decoded
+
+**Description**
+
+Decode the transport type field in the discovery
+log page entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_adrfam_str (__u8 adrfam)
+
+   Decode ADRFAM field
+
+**Parameters**
+
+``__u8 adrfam``
+  value to be decoded
+
+**Description**
+
+Decode the address family field in the discovery
+log page entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_subtype_str (__u8 subtype)
+
+   Decode SUBTYPE field
+
+**Parameters**
+
+``__u8 subtype``
+  value to be decoded
+
+**Description**
+
+Decode the subsystem type field in the discovery
+log page entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_treq_str (__u8 treq)
+
+   Decode TREQ field
+
+**Parameters**
+
+``__u8 treq``
+  value to be decoded
+
+**Description**
+
+Decode the transport requirements field in the
+discovery log page entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_eflags_str (__u16 eflags)
+
+   Decode EFLAGS field
+
+**Parameters**
+
+``__u16 eflags``
+  value to be decoded
+
+**Description**
+
+Decode the EFLAGS field in the discovery log page
+entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_sectype_str (__u8 sectype)
+
+   Decode SECTYPE field
+
+**Parameters**
+
+``__u8 sectype``
+  value to be decoded
+
+**Description**
+
+Decode the SECTYPE field in the discovery log page
+entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_prtype_str (__u8 prtype)
+
+   Decode RDMA Provider type field
+
+**Parameters**
+
+``__u8 prtype``
+  value to be decoded
+
+**Description**
+
+Decode the RDMA Provider type field in the discovery
+log page entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_qptype_str (__u8 qptype)
+
+   Decode RDMA QP Service type field
+
+**Parameters**
+
+``__u8 qptype``
+  value to be decoded
+
+**Description**
+
+Decode the RDMA QP Service type field in the discovery log page
+entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: const char * nvmf_cms_str (__u8 cms)
+
+   Decode RDMA connection management service field
+
+**Parameters**
+
+``__u8 cms``
+  value to be decoded
+
+**Description**
+
+Decode the RDMA connection management service field in the discovery
+log page entry.
+
+**Return**
+
+decoded string
+
+
+.. c:function:: void nvmf_default_config (struct nvme_fabrics_config *cfg)
+
+   Default values for fabrics configuration
+
+**Parameters**
+
+``struct nvme_fabrics_config *cfg``
+  config values to set
+
+**Description**
+
+Initializes **cfg** with default values.
+
+
+.. c:function:: void nvmf_update_config (nvme_ctrl_t c, const struct nvme_fabrics_config *cfg)
+
+   Update fabrics configuration values
+
+**Parameters**
+
+``nvme_ctrl_t c``
+  Controller to be modified
+
+``const struct nvme_fabrics_config *cfg``
+  Updated configuration values
+
+**Description**
+
+Updates the values from **c** with the configuration values from **cfg**;
+all non-default values from **cfg** will overwrite the values in **c**.
+
+
+.. c:function:: int nvmf_add_ctrl (nvme_host_t h, nvme_ctrl_t c, const struct nvme_fabrics_config *cfg)
+
+   Connect a controller and update topology
+
+**Parameters**
+
+``nvme_host_t h``
+  Host to which the controller should be attached
+
+``nvme_ctrl_t c``
+  Controller to be connected
+
+``const struct nvme_fabrics_config *cfg``
+  Default configuration for the controller
+
+**Description**
+
+Issues a 'connect' command to the NVMe-oF controller and inserts **c**
+into the topology using **h** as parent.
+**c** must be initialized and not connected to the topology.
+
+**Return**
+
+0 on success; on failure errno is set and -1 is returned.
+
+
+.. c:function:: int nvmf_get_discovery_log (nvme_ctrl_t c, struct nvmf_discovery_log **logp, int max_retries)
+
+   Return the discovery log page
+
+**Parameters**
+
+``nvme_ctrl_t c``
+  Discovery controller to use
+
+``struct nvmf_discovery_log **logp``
+  Pointer to the log page to be returned
+
+``int max_retries``
+  Number of retries in case of failure
+
+**Description**
+
+The memory allocated for the log page and returned in **logp**
+must be freed by the caller using free().
+
+**Note**
+
+Consider using nvmf_get_discovery_wargs() instead.
+
+**Return**
+
+0 on success; on failure -1 is returned and errno is set
+
+
+
+
+.. c:struct:: nvme_get_discovery_args
+
+   Arguments for nvmf_get_discovery_wargs()
+
+**Definition**
+
+::
+
+  struct nvme_get_discovery_args {
+    nvme_ctrl_t c;
+    int args_size;
+    int max_retries;
+    __u32 *result;
+    __u32 timeout;
+    __u8 lsp;
+  };
+
+**Members**
+
+``c``
+  Discovery controller
+
+``args_size``
+  Length of the structure
+
+``max_retries``
+  Number of retries in case of failure
+
+``result``
+  The command completion result from CQE dword0
+
+``timeout``
+  Timeout in ms (default: NVME_DEFAULT_IOCTL_TIMEOUT)
+
+``lsp``
+  Log specific field (See enum nvmf_log_discovery_lsp)
+
+
+
+.. c:function:: struct nvmf_discovery_log * nvmf_get_discovery_wargs (struct nvme_get_discovery_args *args)
+
+   Get the discovery log page with args
+
+**Parameters**
+
+``struct nvme_get_discovery_args *args``
+  Argument structure
+
+**Description**
+
+This function is similar to nvmf_get_discovery_log(), but
+takes an extensible **args** parameter. **args** provides more
+options than nvmf_get_discovery_log().
+
+This function performs a get discovery log page (DLP) command
+and returns the DLP. The memory allocated for the returned
+DLP must be freed by the caller using free().
+
+**Return**
+
+Pointer to the discovery log page (to be freed). NULL
+on failure and errno is set.
+
+
+.. c:function:: char * nvmf_hostnqn_generate ()
+
+   Generate a machine specific host nqn
+
+**Parameters**
+
+**Return**
+
+An nvm namespace qualified name string based on the machine
+identifier, or NULL if not successful.
+
+
+.. c:function:: char * nvmf_hostnqn_from_file ()
+
+   Reads the host nvm qualified name from the config default location in /usr/local/etc/nvme/
+
+**Parameters**
+
+**Return**
+
+The host nqn, or NULL if unsuccessful. If found, the caller
+is responsible to free the string.
+
+
+.. c:function:: char * nvmf_hostid_from_file ()
+
+   Reads the host identifier from the config default location in /usr/local/etc/nvme/.
+
+**Parameters**
+
+**Return**
+
+The host identifier, or NULL if unsuccessful. If found, the caller
+        is responsible to free the string.
+
+
+.. c:function:: nvme_ctrl_t nvmf_connect_disc_entry (nvme_host_t h, struct nvmf_disc_log_entry *e, const struct nvme_fabrics_config *defcfg, bool *discover)
+
+   Connect controller based on the discovery log page entry
+
+**Parameters**
+
+``nvme_host_t h``
+  Host to which the controller should be connected
+
+``struct nvmf_disc_log_entry *e``
+  Discovery log page entry
+
+``const struct nvme_fabrics_config *defcfg``
+  Default configuration to be used for the new controller
+
+``bool *discover``
+  Set to 'true' if the new controller is a discovery controller
+
+**Return**
+
+Pointer to the new controller
+
+
+.. c:function:: bool nvmf_is_registration_supported (nvme_ctrl_t c)
+
+   check whether registration can be performed.
+
+**Parameters**
+
+``nvme_ctrl_t c``
+  Controller instance
+
+**Description**
+
+Only discovery controllers (DC) that comply with TP8010 support
+explicit registration with the DIM PDU. These can be identified by
+looking at the value of a dctype in the Identify command
+response. A value of 1 (DDC) or 2 (CDC) indicates that the DC
+supports explicit registration.
+
+**Return**
+
+true if controller supports explicit registration. false
+otherwise.
+
+
+.. c:function:: int nvmf_register_ctrl (nvme_ctrl_t c, enum nvmf_dim_tas tas, __u32 *result)
+
+   Perform registration task with a DC
+
+**Parameters**
+
+``nvme_ctrl_t c``
+  Controller instance
+
+``enum nvmf_dim_tas tas``
+  Task field of the Command Dword 10 (cdw10). Indicates whether to
+  perform a Registration, Deregistration, or Registration-update.
+
+``__u32 *result``
+  The command-specific result returned by the DC upon command
+  completion.
+
+**Description**
+
+Perform registration task with a Discovery Controller (DC). Three
+tasks are supported: register, deregister, and registration update.
+
+**Return**
+
+0 on success; on failure -1 is returned and errno is set
+
+