rte_dma_info(3)

💖 rte_dma_info — the whole vibe, explained 💖

okay bestie, so this is rte_dma_info(3), a page from the DPDK Library Functions Manual, and it's literally just the blueprint for one lil' struct that tells you everything about a DMA device. no cap. let's get into it 🦋

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✨ NAME ✨

rte_dma_info — the struct you use to peek at a DMA device's whole personality 💅

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🌸 SYNOPSIS 🌸

#include <rte_dmadev.h>

🎀 Data Fields 🎀

• const char * dev_name
• uint64_t dev_capa
• uint16_t max_vchans
• uint16_t max_desc
• uint16_t min_desc
• uint16_t max_sges
• int16_t numa_node
• uint16_t nb_vchans
• uint16_t nb_priorities

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👑 Detailed Description 👑

A structure used to retrieve the information of a DMA device. that's it, that's the whole job. it's giving "tell me everything about this DMA device and don't leave out the details" 💖

See also

rte_dma_info_get — the function that actually fills this bad boy in 🫶

Definition at line 313 of file rte_dmadev.h.

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🧚 Field Documentation 🧚

const char* dev_name

Unique device name. one-of-a-kind, main character energy only 👑

Definition at line 314 of file rte_dmadev.h.

uint64_t dev_capa

Device capabilities (RTE_DMA_CAPA_*). all the flags describing what this device can actually do ✨

Definition at line 316 of file rte_dmadev.h.

uint16_t max_vchans

Maximum number of virtual DMA channels supported. that's the ceiling, bestie 🔥

Definition at line 318 of file rte_dmadev.h.

uint16_t max_desc

Maximum allowed number of virtual DMA channel descriptors. the upper limit, periodt 💅

Definition at line 320 of file rte_dmadev.h.

uint16_t min_desc

Minimum allowed number of virtual DMA channel descriptors. and the lower limit too, we don't do zero 🌸

Definition at line 322 of file rte_dmadev.h.

uint16_t max_sges

Maximum number of source or destination scatter-gather entry supported. okay so pay attention here, because there are two whole cases:

• If the device does not support the COPY_SG capability, this value can be zero.
• If the device does support the COPY_SG capability, then rte_dma_copy_sg() parameter nb_src/nb_dst should not exceed this value. so don't be out here overshooting, the vibe check will catch you 😭

Definition at line 330 of file rte_dmadev.h.

int16_t numa_node

NUMA node connection, -1 if unknown. if it's -1 it's lowkey a mystery 🔍

Definition at line 332 of file rte_dmadev.h.

uint16_t nb_vchans

Number of virtual DMA channel configured. not the max — the actual count you've set up 🎀

Definition at line 334 of file rte_dmadev.h.

uint16_t nb_priorities

Number of priority levels (must be > 1) if priority scheduling is supported, 0 otherwise. so either you got priorities or you got a big fat zero, no in-between 😌

Definition at line 338 of file rte_dmadev.h.

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💜 Author 💜

Generated automatically by Doxygen for DPDK from the source code. not a human writing this by hand, it's a machine and honestly? it ate 🤖✨

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and that's the whole page, bestie!! this one came straight outta DPDK Version 25.11.3, dated with the rte_dma_info(3) footer energy — go get that DMA info, you're gonna slay 🫶💖🌈