STRUCT IWL_RX_MEM_BUFFER(9)

🦋 struct iwl_rx_mem_buffer(9) — the kernel API manual, bestie edition 🦋

Okay so this is a page from the Kernel API Manual (that's the manual name, iykyk) and it's literally all about struct iwl_rx_mem_buffer — the driver-side RX buffer descriptor. One struct, six members, zero drama. Let's get into it 💅

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✨ NAME ✨

struct iwl_rx_mem_buffer — the driver-side RX buffer descriptor. That's it, that's the whole vibe. It's the lil' receipt the driver keeps for every receive buffer 🧾

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🌸 SYNOPSIS 🌸

Here's the whole shape of her, no cap:

struct iwl_rx_mem_buffer {
    dma_addr_t page_dma;
    struct page *page;
    struct list_head list;
    u32 offset;
    u16 vid;
    bool invalid;
 };

Iconic. Immaculate. Six fields and every single one of them is doing its job 🫶

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💖 Members 💖

page_dma

The bus address of the rxb page. That's the address the hardware side cares about, fr fr 🚌

page

The driver's own pointer to the rxb page — this is the CPU-side view of the same thing, bestie 🌷

list

The list entry for the membuffer. Gotta link 'em all somehow ✨

offset

This one indicates which offset of the page (in bytes) this buffer uses — and yes, that's specifically for when multiple RBs fit into one page. Lowkey efficient 💅

vid

The index of this rxb in the global table. Like a little name tag at the world's nerdiest party 🎀

invalid

Okay so this means the rxb is in driver ownership — not owned by HW. So if invalid is set, the hardware does not have it, the driver does. Important distinction, don't sleep on it 🙈

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🦋 SEE ALSO 🦋

Go touch some other docs too, bestie:

• Kernel file ./drivers/net/wireless/intel/iwlwifi/pcie/gen1_2/internal.h
• struct iwl_rx_transfer_desc(9), struct iwl_rx_completion_desc(9), struct iwl_rx_completion_desc_bz(9), struct iwl_rxq(9), struct iwl_rb_allocator(9), iwl_get_closed_rb_stts(9), enum iwl_fw_mon_dbgfs_state(9), enum iwl_shared_irq_flags(9), enum iwl_image_response_code(9), struct cont_rec(9), enum iwl_pcie_imr_status(9), struct iwl_txq(9), struct iwl_pcie_txqs(9), struct iwl_trans_pcie(9), iwl_txq_inc_wrap(9), iwl_txq_dec_wrap(9)

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And that's the whole page! 🌈 Signing off from ./drivers/net/wireless/intel/i... with a date stamp of October 2026 — same time, same channel, struct iwl_rx_mem_buffer(9) forever 👑💜