PDK API Guide for J721E
Data Fields
EnetUdma_SGList Struct Reference
Enet Driver » Enet Data Path (DMA) » Enet UDMA module APIs. » UDMA Packet Definitions

Detailed Description

Packet scatter list info.

This structure contains info on the scatter list used for transmitting packets that are split into list of fragments. Using a scatter list allows application to transmit packet that are not a single continuous buffer but a list of scatter fragments chained together. Support for scatter list is needed for supporting zero copy in network stacks protocols like UDP

Data Fields

uint32_t numScatterSegments
 
EnetUdma_SGListEntry list [ENET_UDMA_CPSW_MAX_SG_LIST]
 

Field Documentation

◆ numScatterSegments

uint32_t EnetUdma_SGList::numScatterSegments

Number of valid scatter segments in the packet If packet is made of a single continuous buffer (no scatter list case) then numScatterSegments == 1

◆ list

EnetUdma_SGListEntry EnetUdma_SGList::list[ENET_UDMA_CPSW_MAX_SG_LIST]

Array of scatterList having info on each individual scatter segement