239 lines
6.1 KiB
Groff
239 lines
6.1 KiB
Groff
.\" $FreeBSD$
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.Dd May 21, 2019
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.Dt IFLIBDI 9
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.Os
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.Sh NAME
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.Nm iflibdi
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.Nd Device Independent Configuration Functions
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.Sh SYNOPSIS
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.In "ifdi_if.h"
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.Ss "Device Independent Functions"
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.Ft int
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.Fo iflib_device_attach
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.Fa "device_t dev"
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.Fc
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.Ft int
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.Fo iflib_device_detach
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.Fa "device_t dev"
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.Fc
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.Ft int
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.Fo iflib_device_suspend
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.Fa "device_t dev"
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.Fc
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.Ft int
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.Fo iflib_device_resume
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.Fa "device_t dev"
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.Fc
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.Ft int
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.Fo iflib_device_register
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.Fa "device_t dev"
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.Fa "void *softc"
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.Fa "if_shared_ctx_t sctx"
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.Fa "if_ctx_t *ctxp"
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.Fc
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.Ft int
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.Fo iflib_device_deregister
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.Fa "if_ctx_t ctx"
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.Fc
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.Ft int
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.Fo iflib_irq_alloc
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.Fa "if_ctx_t ctx"
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.Fa "if_irq_t irq_info"
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.Fa "int rid"
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.Fa "driver_filter_t filter"
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.Fa "void *filter_arg"
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.Fa "driver_intr_t handler"
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.Fa "void *arg"
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.Fa "char *name"
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.Fc
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.Ft int
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.Fo iflib_irq_alloc_generic
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.Fa "if_ctx_t ctx"
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.Fa "if_irq_t irq"
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.Fa "int rid"
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.Fa "intr_type_t type"
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.Fa "driver_filter_t *filter"
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.Fa "void *filter_arg"
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.Fa "int qid"
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.Fa "char *name"
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.Fc
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.Ft void
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.Fo iflib_led_create
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.Fa "if_ctx_t ctx"
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.Fc
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.Ft void
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.Fo iflib_tx_intr_deferred
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.Fa "if_ctx_t ctx"
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.Fa "int txqid"
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.Fc
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.Ft void
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.Fo iflib_rx_intr_deferred
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.Fa "if_ctx_t ctx"
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.Fa "int rxqid"
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.Fc
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.Ft void
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.Fo iflib_link_intr_deferred
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.Fa "if_ctx_t ctx"
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.Fc
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.Ft void
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.Fo iflib_link_state_change
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.Fa "if_ctx_t ctx"
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.Fa "int linkstate"
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.Fc
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.Ft void
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.Fo iflib_add_int_delay_sysctl
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.Fa "if_ctx_t ctx"
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.Fa "const char *"
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.Fa "const char *"
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.Fa "if_int_delay_info_t"
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.Fa "int"
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.Fa "int"
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.Fc
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.Ss "Global Variables"
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.Vt extern struct if_txrx
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.Sh DATA STRUCTURES
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The \fIif_ctx_t\fP Structure is the device independent data structure that
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contains statistics and identifying information used to transmit and receive
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data packets.
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The interface is associated with an array of queues assigned sequentially.
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Each queue has its own transmit (iflib_txq_t) and receive (iflib_rxq_t) queue.
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The transmit queue is used to hold packets while the interface is in the
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process of sending another.
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The receive queue is used to receive packets that are awaiting processing.
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.Pp
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.Ss The if_ctx_t Structure
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The fields of
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.Vt "struct if_ctx_t"
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are as follows:
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.Bl -tag -width ".Va if_capabilities" -offset indent
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.It Va if_softc
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.Pq Vt "void"
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A pointer to the driver's private state block.
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.It Va ifc_dev
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.Pq Vt "device_t"
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The underlying device structure.
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.It Va ifc_ip
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.Pq Vt "if_t"
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A link back to the interface structure
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.It Va ifc_cpus
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.Pq Vt "cpuset_t"
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.It Va ifc_mutex
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.Pq Vt "struct mtx"
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Mutex lock used to maintain data integrity
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.It Va ifc_mtx_name
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.Pq Vt "char *"
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The name of the mutex
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.It Va ifc_txqs
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.Pq Vt "iflib_txq_t"
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Device independent transmit queue maintained internally by iflib
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.It Va ifc_rxqs
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.Pq Vt "iflib_rxq_t"
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Device independent receive queue maintained internally by iflib
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.It Va ifc_qsets
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.Pq Vt "iflib_qset_t"
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Output queue that contains a single transmit (ifc_txq_t) and receive
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(ifc_rxq_t) queue
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.It Va ifc_if_flags
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.Pq Vt "uint32_t"
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Flags describing the operational parameter of the interface
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.It Va ifc_in_detach
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.Pq Vt "int"
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.It Va ifc_link_state
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.Pq Vt "int"
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Describes the current link state of the Ethernet interface.
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Its possible values are either active or inactive.
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.It Va ifc_link_irq
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.Pq Vt "int"
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.It Va ifc_vlan_attach_event
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.Pq Vt "eventhandler_tag"
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.It Va ifc_vlan_detach_event
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.Pq Vt "eventhandler_tag"
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.It Va ifc_pause_frames
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.Pq Vt "int"
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.It Va ifc_watchdog_events
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.Pq Vt "int"
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.It Va ifc_mac
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.Pq Vt "uint8_t"
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.It Va ifc_msix_mem
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.Pq Vt "struct resource *"
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.It Va ifc_legacy_irq
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.Pq Vt "struct if_irq"
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.It Va ifc_admin_task
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.Pq Vt "struct grouptask"
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Taskqueue task scheduled for link state change events of the interface
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.It Va ifc_filter_info
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.Pq Vt "struct iflib_filter_info"
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Statistics and information relating to the interface device filter
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.It Va ifc_media
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.Pq Vt "struct ifmedia"
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.It Va ifc_txrx
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.Pq Vt "struct if_txrx"
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.El
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.Sh FUNCTIONS
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The above named functions are found exclusively in iflib.
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They are independent of the underlying hardware type or configuration.
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.Ss Device Independent Functions
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.Bl -ohang -offset indent
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.It Fn iflib_device_attach
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Function initiates a device registration with the iflib framework.
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It calls the iflib_register function, which is responsible for allocating
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and initializing the \fIif_ctx_t\fP structure.
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.It Fn iflib_device_detach
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Shutdown and detach the device.
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Unregister vlan events, drain any dependent tasks, and release irq, pci, and
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msix memory.
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.It Fn iflib_device_suspend
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Suspend a device by calling the device dependent suspend function and
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bus_generic_suspend.
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.It Fn iflib_device_resume
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Resume a device by calling the device dependent resume function, the
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iflib_init_locked function, and bus_generic_resume.
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.It Fn iflib_device_register
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Register a device with the iflib framework.
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Allocate and initialize the
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\fIif_ctx_t\fP structure.
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Setup and initialize the MSI or MSI/X interrupt queues if necessary.
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Allocate memory for queues and qset structure setup.
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.It Fn iflib_irq_alloc
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Allocate an interrupt resource for a given rid value with an associated filter
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and handler function.
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.It Fn iflib_irq_alloc_generic
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Performs the same function as iflib_device_irq_alloc along with the additional
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functionality of adding a taskgroup.
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The data fields and callback function are determined by the type of interrupt,
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such as
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.Dv IFLIB_INTR_TX ,
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.Dv IFLIB_INTR_RX ,
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and
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.Dv IFLIB_INTR_ADMIN .
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.It Fn iflib_led_create
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Calls led_create to initialize the ctx->ifc_led_dev field
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.It Fn iflib_tx_intr_deferred
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Calls GROUPTASK_ENQUEUE to enqueue the transfer queues ift_task.
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.It Fn iflib_rx_intr_deferred
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Calls GROUPTASK_ENQUEUE to enqueue the receive queues ifr_task.
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.It Fn iflib_link_intr_deferred
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Calls GROUPTASK_ENQUEUE to enqueue the link task
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.It Fn iflib_link_state_change
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Change the interface link status to either
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.Dv LINK_STATE_UP
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or
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.Dv LINK_STATE_DOWN
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as specified by the second argument to the function.
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.Pp
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.Em Interface Link States
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The following link states are currently defined:
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.It Dv LINK_STATE_UP
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The link is up.
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.It Dv LINK_STATE_DOWN
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The link is down.
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.It Fn iflib_add_int_delay_sysctl
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Modifies settings to user defined values for a given set of variables.
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.El
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.Sh SEE ALSO
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.Xr iflibdd 9 ,
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.Xr iflibtxrx 9
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.Sh AUTHORS
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This manual page was written by
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.An Nicole Graziano
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