STRUCT IWL_MVM_BAID_DATA(9)

✨ struct iwl_mvm_baid_data(9) — BA session data ✨

okay so bestie, we're in the Kernel API Manual today and the star of the show is struct iwl_mvm_baid_data, which is literally just BA session data 💅 no cap, that's the whole NAME section, we move fast here.

---

🌸 NAME 🌸

struct iwl_mvm_baid_data — BA session data. that's it. that's the vibe. 🎀

---

🦋 SYNOPSIS 🦋

like, here's the whole glow-up, character for character, don't touch it:

struct iwl_mvm_baid_data {
    struct rcu_head rcu_head;
    u32 sta_mask;
    u8 tid;
    u8 baid;
    u16 timeout;
    u16 buf_size;
    u16 entries_per_queue;
    unsigned long last_rx;
    struct timer_list session_timer;
    struct iwl_mvm_baid_data **rcu_ptr;
    struct iwl_mvm *mvm;
    struct iwl_mvm_reorder_buffer reorder_buf[IWL_MAX_RX_HW_QUEUES];
    struct iwl_mvm_reorder_buf_entry entries[];
};

she's got range 😭 struct, array, flexible array member at the end — main character energy fr fr.

---

💖 MEMBERS 💖

bestie, let's meet the cast one by one, they all ate:

• rcu_head — the RCU head for freeing this data</... okay no, for real: it's the RCU head used for freeing this data 🫶
• sta_mask — the current station mask for the BAID ✨
• tid — the tid of the session 💜
• baid — the baid of the session 👑
• timeout — the timeout that got set in the addba request ⏰
• buf_size — the reorder buffer size, as set by the last addba request 🍓
• entries_per_queue — the # of buffers per queue; and lowkey this one actually gets aligned up to avoid cache line sharing between queues, iykyk 🧚
• last_rx — last rx jiffies, and it only gets updated if the timeout passed since the last update 🙈
• session_timer — a timer to check if the BA session expired; it runs at 2 * timeout ⭐
• rcu_ptr — BA data RCU protected access 🔥
• mvm — the mvm pointer, needed for timer context (timer said "I need an adult") 💀
• reorder_buf — the reorder buffer, allocated per queue 🌈
• entries — data 📦

---

👀 SEE ALSO 👀

go look at the kernel file ./drivers/net/wireless/intel/iwlwifi/mvm/mvm.h, and also these iconic neighbors:

• struct iwl_mvm_mod_params(9)
• enum iwl_power_scheme(9)
• enum iwl_mvm_low_latency_force(9)
• enum iwl_mvm_low_latency_cause(9)
• struct iwl_mvm_link_bf_data(9)
• struct iwl_probe_resp_data(9)
• struct iwl_mvm_vif_link_info(9)
• struct iwl_mvm_vif(9)
• struct iwl_mvm_tt_mgmt(9)
• struct iwl_mvm_thermal_device(9)
• struct iwl_mvm_reorder_buffer(9)
• struct iwl_mvm_reorder_buf_entry(9)
• struct iwl_mvm_tvqm_txq_info(9)
• struct iwl_mvm_acs_survey_channel(9)
• enum iwl_mvm_status(9)
• struct iwl_mvm_roc_ops(9)
• struct iwl_mvm_switch_vif_chanctx_ops(9)

---

lowkey mandatory reading list, but make it cute. no skimming bestie, these are all linked from the same header 🫶

---

and that's the whole page!! source: ./drivers/net/wireless/intel/i..., dated October 2026, and we're still slaying in struct iwl_mvm_baid_data(9) 💅✨ bye bestie, go read some kernel headers 💖