ath5k_hw_set_bssid_mask(9)

💅 ath5k_hw_set_bssid_mask(9) — like, the Kernel API Manual one ✨

okay so bestie, buckle up — this is ath5k_hw_set_bssid_mask from the Kernel API Manual and it's genuinely iconic in a niche-driver-girl way 🎀

---

✨ NAME ✨

ath5k_hw_set_bssid_mask — filter out bssids we listen to 🦋

---

🌸 SYNOPSIS 🌸

void ath5k_hw_set_bssid_mask (struct ath5k_hw *ah , const u8 *mask );

---

💖 ARGUMENTS 💖

• ah — the struct ath5k_hw, obviously 💅
• mask — the BSSID mask to set (array of octets), no cap 📮

---

👑 DESCRIPTION 👑

okay so BSSID masking is a method used by AR5212 and newer hardware to inform PCU which bits of the interface's MAC address should be looked at when it's trying to decide which packets to ACK. literally a vibe check for packets 🔥

In station mode and AP mode with a single BSS, every bit matters since we lock to only one BSS. periodt.

But in AP mode with multiple BSSes (virtual interfaces) not every bit matters, because the hw must accept frames for all the BSSes — so we tweak some bits of our mac address in order to have multiple BSSes. it's giving main character energy with a whole squad 🫶

For more information check out ../hw.c of the common ath module, iykyk 💜

---

🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/wireless/ath/ath5k/pcu.c Protocol Control Unit (PCU) functions(9)
• ACK rates(9)
• ath5k_hw_get_frame_duration(9)
• ath5k_hw_get_default_slottime(9)
• ath5k_hw_get_default_sifs(9)
• ath5k_hw_update_mib_counters(9)
• ath5k_hw_write_rate_duration(9)
• ath5k_hw_set_ack_timeout(9)
• ath5k_hw_set_cts_timeout(9)
• ath5k_hw_set_lladdr(9)
• ath5k_hw_set_bssid(9)
• ath5k_hw_set_mcast_filter(9)
• ath5k_hw_get_rx_filter(9)
• ath5k_hw_set_rx_filter(9)
• ath5k_hw_get_tsf64(9)
• ath5k_hw_set_tsf64(9)
• ath5k_hw_reset_tsf(9)
• ath5k_hw_init_beacon_timers(9)
• ath5k_check_timer_win(9)
• ath5k_hw_check_beacon_timers(9)
• ath5k_hw_set_coverage_class(9)
• ath5k_hw_start_rx_pcu(9)
• ath5k_hw_stop_rx_pcu(9)
• ath5k_hw_set_opmode(9)
• ath5k_hw_pcu_init(9)

---

🫶 that's the whole page bestie — no gatekeeping, every single ref is there ⭐

k so this came from ./drivers/net/wireless/ath/ath5k and it's dated October 2026, and it's literally the ath5k_hw_set_bssid_mask(9) page 💀💖 slay, go read the source, bye 🧚