ENUM QUEUE_INDEX(9)

✨ enum queue_index — Queue index type ✨

Okay bestie, gather round, because we're looking at the enum queue_index(9) page from the Kernel API Manual and honestly? It's a little gem 💎. It's short, it's sweet, and it's literally just four constants that make the rt2x00 queue machinery go brrr. Let's get into it 🫶

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🌸 SYNOPSIS 🌸

Here's the whole enum, verbatim, no cap:

enum queue_index {
    Q_INDEX ,
    Q_INDEX_DMA_DONE ,
    Q_INDEX_DONE ,
    Q_INDEX_MAX

};

That's it. Four members. Clean. Iconic. Periodt 💅

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💖 Constants 💖

Now for the actual tea on each one — same facts as always, just with better vibes:

• Q_INDEX — the index pointer to the current entry in the queue. And here's the spicy part: if this entry is owned by the hardware, then the queue is considered to be full 👀. So like, hardware owning it = no room, bestie.
• Q_INDEX_DMA_DONE — the index pointer for the next entry which will have been transferred to the hardware. It's giving "what's about to land" energy ✨
• Q_INDEX_DONE — the index pointer to the next entry which will be completed by the hardware and for which we need to run the txdone handler 🔥. Flip side of Q_INDEX: if this entry is not owned by the hardware, the queue is considered to be empty 🌈.
• Q_INDEX_MAX — keep this one last, okay? It's used in struct data_queue to determine the size of the index array 👑. Do not move it. It's the main character of "array size math" and it needs to stay in its spot.

Lowkey important: Q_INDEX_MAX last. That's not a suggestion, that's the whole point of it 🎀

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🦋 SEE ALSO 🦋

Everything's connected, iykyk. Here's the full squad, all of them (9):

Kernel file ./drivers/net/wireless/ralink/rt2x00/rt2x00queue.h Entry frame size(9), enum data_queue_qid(9), enum skb_frame_desc_flags(9), struct skb_frame_desc(9), get_skb_frame_desc(9), enum rxdone_entry_desc_flags(9), RXDONE_SIGNAL_MASK(9), struct rxdone_entry_desc(9), enum txdone_entry_desc_flags(9), struct txdone_entry_desc(9), enum txentry_desc_flags(9), struct txentry_desc(9), enum queue_entry_flags(9), struct queue_entry(9), enum data_queue_flags(9), struct data_queue(9), queue_end(9), tx_queue_end(9), queue_next(9), queue_loop(9), queue_for_each(9), tx_queue_for_each(9), txall_queue_for_each(9), rt2x00queue_for_each_entry(9), rt2x00queue_empty(9), rt2x00queue_full(9), rt2x00queue_threshold(9), rt2x00queue_dma_timeout(9), _rt2x00_desc_read(9), rt2x00_desc_read(9), rt2x00_desc_write(9) 💜

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One more thing 🧚 — the source path in the footer gets truncated to ./drivers/net/wireless/ralink/... which is basically the manpage equivalent of a text message that got cut off mid-sentence 😭. You know the drill.

Okay that's the whole page! This little cutie of a manpage comes from the Kernel API Manual, sourced from ./drivers/net/wireless/ralink/..., dated October 2026. Slay, read it, love it, cite it properly in your SEE ALSO 🎀✨ bye bestie 💖