fw_cdev_event_iso_interrupt_mc Struct Reference

#include <firewire-cdev.h>

Data Fields
__u64	closure
__u32	type
__u32	completed

Detailed Description

struct fw_cdev_event_iso_interrupt_mc - An iso buffer chunk was completed : See set by FW_CDEV_CREATE_ISO_CONTEXT ioctl : FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL : Offset into the receive buffer; data before this offset is valid

This event is sent in multichannel contexts (context type FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL) for &fw_cdev_iso_packet buffer chunks that have been completely filled and that have the FW_CDEV_ISO_INTERRUPT bit set, or when explicitly requested with FW_CDEV_IOC_FLUSH_ISO.

The buffer is continuously filled with the following data, per packet:

• the 1394 iso packet header as described at &fw_cdev_event_iso_interrupt, but in little endian byte order,
• packet payload (as many bytes as specified in the data_length field of the 1394 iso packet header) in big endian byte order,
• 0...3 padding bytes as needed to align the following trailer quadlet,
• trailer quadlet, containing the reception timestamp as described at &fw_cdev_event_iso_interrupt, but in little endian byte order.

Hence the per-packet size is data_length (rounded up to a multiple of 4) + 8. When processing the data, stop before a packet that would cross the offset.

A packet near the end of a buffer chunk will typically spill over into the next queued buffer chunk. It is the responsibility of the client to check for this condition, assemble a broken-up packet from its parts, and not to re-queue any buffer chunks in which as yet unread packet parts reside.

Definition at line 296 of file firewire-cdev.h.

Field Documentation

__u64 closure

Definition at line 297 of file firewire-cdev.h.

__u32 completed

Definition at line 299 of file firewire-cdev.h.

__u32 type

Definition at line 298 of file firewire-cdev.h.

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The documentation for this struct was generated from the following file:

• include/uapi/linux/firewire-cdev.h