IFLIBDI(9)

💖 IFLIBDI(9) — Device Independent Configuration Functions 💖

okay so bestie, this is the Kernel Developer's Manual page for iflibdi, and it's giving very much “kernel-core, device-independent, no drama” energy. Let's get into it 💅

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🌸 NAME 🌸

iflibdi — Device Independent Configuration Functions

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✨ SYNOPSIS ✨

#include <ifdi_if.h>

💅 Device Independent Functions

       int
       iflib_device_attach(device_t dev);

       int
       iflib_device_detach(device_t dev);

       int
       iflib_device_suspend(device_t dev);

       int
       iflib_device_resume(device_t dev);

       int
       iflib_device_register(device_t dev, void *softc, if_shared_ctx_t sctx,
           if_ctx_t *ctxp);

       int
       iflib_device_deregister(if_ctx_t ctx);

       int
       iflib_irq_alloc(if_ctx_t ctx, if_irq_t irq_info, int rid,
           driver_filter_t filter, void *filter_arg, driver_intr_t handler,
           void *arg, char *name);

       int
       iflib_irq_alloc_generic(if_ctx_t ctx, if_irq_t irq, int rid,
           intr_type_t type, driver_filter_t *filter, void *filter_arg,
           int qid, char *name);

       void
       iflib_led_create(if_ctx_t ctx);

       void
       iflib_tx_intr_deferred(if_ctx_t ctx, int txqid);

       void
       iflib_rx_intr_deferred(if_ctx_t ctx, int rxqid);

       void
       iflib_link_intr_deferred(if_ctx_t ctx);

       void
       iflib_link_state_change(if_ctx_t ctx, int linkstate);

       void
       iflib_add_int_delay_sysctl(if_ctx_t ctx, const char *, const char *,
           if_int_delay_info_t, int, int);

🎀 Global Variables

       extern struct if_txrx

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🫶 DATA STRUCTURES 🫶

The if_ctx_t Structure is the device independent data structure that contains statistics and identifying information used to transmit and receive data packets. The interface is associated with an array of queues assigned sequentially. Each queue has its own transmit (iflib_txq_t) and receive (iflib_rxq_t) queue. The transmit queue is used to hold packets while the interface is in the process of sending another. The receive queue is used to receive packets that are awaiting processing. Slay, queues 💖

🎀 The if_ctx_t Structure

The fields of struct if_ctx_t are as follows:

• if_softc — (void) A pointer to the driver's private state block.
• ifc_dev — (device_t) The underlying device structure.
• ifc_ip — (if_t) A link back to the interface structure
• ifc_cpus — (cpuset_t)
• ifc_mutex — (struct mtx) Mutex lock used to maintain data integrity
• ifc_mtx_name — (char *) The name of the mutex
• ifc_txqs — (iflib_txq_t) Device independent transmit queue maintained internally by iflib
• ifc_rxqs — (iflib_rxq_t) Device independent receive queue maintained internally by iflib
• ifc_qsets — (iflib_qset_t) Output queue that contains a single transmit (ifc_txq_t) and receive (ifc_rxq_t) queue
• ifc_if_flags — (uint32_t) Flags describing the operational parameter of the interface
• ifc_in_detach — (int)
• ifc_link_state — (int) Describes the current link state of the Ethernet interface. Its possible values are either active or inactive.
• ifc_link_irq — (int)
• ifc_vlan_attach_event — (eventhandler_tag)
• ifc_vlan_detach_event — (eventhandler_tag)
• ifc_pause_frames — (int)
• ifc_watchdog_events — (int)
• ifc_mac — (uint8_t)
• ifc_msix_mem — (struct resource *)
• ifc_legacy_irq — (struct if_irq)
• ifc_admin_task — (struct grouptask) Taskqueue task scheduled for link state change events of the interface
• ifc_filter_info — (struct iflib_filter_info) Statistics and information relating to the interface device filter
• ifc_media — (struct ifmedia)
• ifc_txrx — (struct if_txrx)

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🔥 FUNCTIONS 🔥

The above named functions are found exclusively in iflib. They are independent of the underlying hardware type or configuration. No cap, they really said “hardware? never heard of her” 😭

💖 Device Independent Functions 💖

• iflib_device_attach() — Function initiates a device registration with the iflib framework. It calls the iflib_register function, which is responsible for allocating and initializing the if_ctx_t structure.
• iflib_device_detach() — Shutdown and detach the device. Unregister vlan events, drain any dependent tasks, and release irq, pci, and msix memory.
• iflib_device_suspend() — Suspend a device by calling the device dependent suspend function and bus_generic_suspend.
• iflib_device_resume() — Resume a device by calling the device dependent resume function, the iflib_init_locked function, and bus_generic_resume.
• iflib_device_register() — Register a device with the iflib framework. Allocate and initialize the if_ctx_t structure. Setup and initialize the MSI or MSI/X interrupt queues if necessary. Allocate memory for queues and qset structure setup.
• iflib_irq_alloc() — Allocate an interrupt resource for a given rid value with an associated filter and handler function.
• iflib_irq_alloc_generic() — Performs the same function as iflib_device_irq_alloc along with the additional functionality of adding a taskgroup. The data fields and callback function are determined by the type of interrupt, such as IFLIB_INTR_TX, IFLIB_INTR_RX, and IFLIB_INTR_ADMIN.
• iflib_led_create() — Calls led_create to initialize the ctx->ifc_led_dev field
• iflib_tx_intr_deferred() — Calls GROUPTASK_ENQUEUE to enqueue the transfer queues ift_task.
• iflib_rx_intr_deferred() — Calls GROUPTASK_ENQUEUE to enqueue the receive queues ifr_task.
• iflib_link_intr_deferred() — Calls GROUPTASK_ENQUEUE to enqueue the link task
• iflib_link_state_change() — Change the interface link status to either LINK_STATE_UP or LINK_STATE_DOWN as specified by the second argument to the function.
  • Interface Link States The following link states are currently defined:
    • LINK_STATE_UP — The link is up.
    • LINK_STATE_DOWN — The link is down.
• iflib_add_int_delay_sysctl() — Modifies settings to user defined values for a given set of variables.

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🌈 SEE ALSO 🌈

• iflibdd(9)
• iflibtxrx(9)

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💜 AUTHORS 💜

This manual page was written by Nicole Graziano

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mwah 💋 — this page comes from Debian, dated May 21, 2019, under the IFLIBDI(9) banner. periodt.