STRUCT IWL_TFD(9)

💖 struct iwl_tfd — Transmit Frame Descriptor (TFD) 💖

okay so bestie, this is a page from the Kernel API Manual (the 9 section, kernel girlies know) and it's all about struct iwl_tfd, which literally stands for Transmit Frame Descriptor — TFD if you're in a hurry 💅. it's giving "the little receipt that tells the hardware where your frames are at." iconic.

✨ SYNOPSIS ✨

here's the whole struct, laid out exactly as it lives, no cap:

struct iwl_tfd {
    u8 __reserved1[3];
    u8 num_tbs;
    struct iwl_tfd_tb tbs[IWL_NUM_OF_TBS];
    __le32 __pad;
 };

that's it. that's the queen. 🎀

🌸 Members 🌸

okay let's go member by member, bestie, no skipping:

• __reserved1 — reserved. it's just vibing there, 3 bytes of u8, not for you to touch 🙈
• num_tbs — the good part:
  • 0-4 → number of active tbs 🔥
  • 5 → reserved
  • 6-7 → padding (not used)
• tbs — the transmit frame buffer descriptors, an array of struct iwl_tfd_tb sized IWL_NUM_OF_TBS. this is the main character energy of the whole struct ✨
• __pad — padding. __le32. it's padding, that's the whole job, slay 🫶

🦋 SEE ALSO 🦋

go read these next, iykyk:

• Kernel file ./drivers/net/wireless/intel/iwlwifi/iwl-fh.h
• struct iwl_rb_status(9)
• enum iwl_tfd_tb_hi_n_len(9)
• struct iwl_tfd_tb(9)
• struct iwl_tfh_tb(9)
• struct iwl_tfh_tfd(9)
• struct iwl_bc_tbl_entry(9)

and that's the page, bestie 💜 — brought to you by the source at ./drivers/net/wireless/intel/i..., dated October 2026, part of the Kernel API Manual. go forth and describe your frames, you absolute icon 👑