STRUCT IEEE80211_FAST_RX(9)

💅 struct ieee80211_fast_rx(9) — the kernel API manual, but make it make sense

okay so bestie, welcome to the struct ieee80211_fast_rx(9) page ✨ this is the Kernel API Manual, and we're talking about one specific little struct, so buckle up 🎀

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🦋 NAME 🦋

struct ieee80211_fast_rx — literally the RX fastpath information. that's the whole vibe. it's the struct that holds the deets the receive fastpath needs to not have to think too hard 💅

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✨ SYNOPSIS ✨

here's the whole thing, character for character, no cap:

struct ieee80211_fast_rx {
    struct net_device *dev;
    enum nl80211_iftype vif_type;
    u8 vif_addr[ETH_ALEN];
    u8 rfc1042_hdr[6];
    __be16 control_port_protocol;
    __le16 expected_ds_bits;
    u8 icv_len;
    u8 key:1, internal_forward:1, uses_rss:1;
    u8 da_offs, sa_offs;
    struct rcu_head rcu_head;
 };

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🌸 Members 🌸

like, one by one, here's what each field is giving 👑

• dev — the netdevice, for reporting the SKB 🫶
• vif_type — the (P2P-less) interface type of the original sdata, aka sdata->vif.type. yes, P2P-less, that's the note, keep it 💖
• vif_addr — the interface address
• rfc1042_hdr — a copy of the RFC 1042 SNAP header, kept around so it's already in cache. obsessed with a pre-cached header ngl ⭐
• control_port_protocol — the control port protocol, copied over from sdata
• expected_ds_bits — the from/to DS bits that are expected 👀
• icv_len — length of the MIC, if there is one
• key — a bool indicating encryption is expected (key is set) 🔥
• internal_forward — forward frames internally on AP/VLAN type interfaces
• uses_rss — a copy of the USES_RSS hw flag
• da_offs — offset of the DA in the header (for header conversion) 🎯
• sa_offs — offset of the SA in the header (for header conversion) 🎯
• rcu_head — the RCU head, for freeing this structure. bye bestie, RCU will handle the cleanup 💀

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🧚 SEE ALSO 🧚

go read these next, iykyk 🌈

• Kernel file ./net/mac80211/sta_info.h
• enum ieee80211_sta_info_flags(9)
• struct tid_ampdu_tx(9)
• struct tid_ampdu_rx(9)
• struct sta_ampdu_mlme(9)
• struct ieee80211_fast_tx(9)
• struct mesh_sta(9)
• struct link_sta_info(9)
• struct ieee80211_sta_removed_link_stats(9)
• struct sta_info(9)
• __sta_info_flush(9)
• sta_info_flush(9)

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this page lives in ./net/mac80211 and it's dated October 2026 — that's the source and the date, mwah 💋

and that's the whole page, bestie. struct ieee80211_fast_rx(9) ate and left no crumbs 👑💜