STRUCT KNAV_DMA_DESC(9)

🌸 NAME 🌸

okay bestie, meet struct knav_dma_desc(9) — the Host packet descriptor layout straight outta the Kernel API Manual. it's giving “here’s the host packet descriptor layout,” and honestly? iconic 💖

✨ SYNOPSIS ✨

the whole struct, no cap:

       struct knav_dma_desc {
           __le32 desc_info;
           __le32 tag_info;
           __le32 packet_info;
           __le32 buff_len;
           __le32 buff;
           __le32 next_desc;
           __le32 orig_len;
           __le32 orig_buff;
           __le32 epib[KNAV_DMA_NUM_EPIB_WORDS];
           __le32 psdata[KNAV_DMA_NUM_PS_WORDS];
           u32 sw_data[KNAV_DMA_NUM_SW_DATA_WORDS];
        };

🫶 Members 🫶

• desc_info — descriptor info like id, type, length. little metadata moment 🎀
• tag_info — flow tag info written in during RX. yes bestie, RX is the vibe 💅
• packet_info — Queue Manager, policy, flags etc. the whole trio, periodt 👑
• buff_len — buffer length in bytes. literally the size, bestie 📏
• buff — buffer pointer. points at the buffer 🫶
• next_desc — for chaining the descriptors. chaining behavior, iykyk 🔗
• orig_len — length since buff_len can be overwritten. important lore: buff_len is not forever 😭
• orig_buff — buff pointer since buff can be overwritten. same energy: buff can get overwritten too 🙈
• epib — Extended packet info block. extended packet info block excellence ✨
• psdata — Protocol specific. protocol-specific, as it should be 🦋
• sw_data — Software private data not touched by h/w. it’s software’s private little journal and hardware does not touch it 💀

💖 SEE ALSO 💖

go peek at the Kernel file ./include/linux/soc/ti/knav_dma.h, plus struct knav_dma_tx_cfg(9), struct knav_dma_rx_cfg(9), and struct knav_dma_cfg(9). bestie homework, slay 📚✨

mwah 💋 this page is brought to you by source ./include/linux/soc/ti, dated October 2026, and it’s all about struct knav_dma_desc(9) — bye bestie 🫶