STRUCT IEEE80211_BAR(9)

💅 struct ieee80211_bar(9) — the Kernel API Manual moment

okay bestie, so we're in the Kernel API Manual (yes, that one) and today's main character is struct ieee80211_bar 🎀 — literally the Block Ack Request frame format. no cap, she's iconic, she's tiny, she's doing a lot.

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🌸 NAME 🌸

struct ieee80211_bar — the Block Ack Request frame format. periodt. 💖

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✨ SYNOPSIS ✨

like, here's her whole personality, character for character:

struct ieee80211_bar {
    __le16 frame_control;
    __le16 duration;
    __u8 ra[ETH_ALEN];
    __u8 ta[ETH_ALEN];
    __le16 control;
    __le16 start_seq_num;
 };

ngl the indentation in that closing brace is exactly the vibe we were given, so we're keeping it 🫶

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🦋 Members 🦋

okay so let's meet the cast, one by one, no skipping, everyone gets their moment 👑

• frame_control — Frame Control. she's the opening act, she sets the tone 💅
• duration — Duration. the timing girlie ⏱️
• ra — RA. yep, that's it, that's the whole description, and we respect her brevity 🎀
• ta — TA. equally brief, equally iconic ✨
• control — BAR Control. the actual control freak of the group (affectionate) 💀
• start_seq_num — Starting Sequence Number. and lowkey the best part: she comes with a citation — see Figure 9-37 👀📖

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💜 Description 💜

so what is she?? this structure represents the "BlockAckReq frame format", exactly as described in IEEE Std 802.11-2020 section 9.3.1.7. that's it, that's the whole lore. she's canon, she's spec-accurate, she ate 🔥

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🌈 SEE ALSO 🌈

go read these next, bestie, they're all in the group chat together:

• Kernel file ./include/linux/ieee80211-ht.h struct ieee80211_mcs_info(9)
• struct ieee80211_ht_cap(9)
• struct ieee80211_ht_operation(9)

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🧚 the cute sign-off 🧚

this little love letter lives in ./include/linux, dated October 2026, and her full glow-up title is struct ieee80211_bar(9) — go forth and parse those frames, queen 💖🎀🦋 slay responsibly, mwah 💋