STRUCT IOSM_MUX(9)

💖 struct iosm_mux(9) 💖

okay so we're in the Kernel API Manual bestie, and today's main character is struct iosm_mux — literally the structure that handles data multiplexing over an IP channel. no cap, that's the whole vibe. let's get into it 🎀

✨ SYNOPSIS ✨

struct iosm_mux {
    struct device *dev;
    struct mux_session session[IPC_MEM_MUX_IP_SESSION_ENTRIES];
    struct ipc_mem_channel *channel;
    struct iosm_pcie *pcie;
    struct iosm_imem *imem;
    struct iosm_wwan *wwan;
    struct iosm_protocol *ipc_protocol;
    int channel_id;
    enum ipc_mux_protocol protocol;
    enum ipc_mux_ul_flow ul_flow;
    int nr_sessions;
    int instance_id;
    enum mux_state state;
    enum mux_event event;
    u32 tx_transaction_id;
    int rr_next_session;
    struct mux_adb ul_adb;
    int size_needed;
    long long ul_data_pend_bytes;
    struct mux_acb acb;
    int wwan_q_offset;
    u16 acb_tx_sequence_nr;
    u16 adb_tx_sequence_nr;
    unsigned long long acc_adb_size;
    unsigned long long acc_payload_size;
    u8 initialized:1, ev_mux_net_transmit_pending:1, adb_prep_ongoing;
};

like, look at her. so many fields. she's booked and busy 🌸

🦋 Members 🦋

• dev — pointer to the device structure 🫶
• session — the array of the MUX sessions, bestie. plural. many queens 👑
• channel — reference to the IP MUX channel
• pcie — pointer to the iosm_pcie struct
• imem — pointer to iosm_imem
• wwan — pointer to iosm_wwan (the original literally spells it "Poinetr" and honestly? iconic typo, we stan, moving on 💅)
• ipc_protocol — pointer to iosm_protocol
• channel_id — the channel ID for MUX
• protocol — type of the MUX protocol
• ul_flow — UL Flow type
• nr_sessions — number of sessions
• instance_id — the instance ID
• state — states of the MUX object
• event — initiated actions to change the state of the MUX object
• tx_transaction_id — transaction id for the ACB command ✨
• rr_next_session — next session number for round robin
• ul_adb — state of the UL ADB/ADGH
• size_needed — variable to store the size needed during ADB preparation
• ul_data_pend_bytes — pending UL data to be processed, in bytes 📏
• acb — temporary ACB state
• wwan_q_offset — this will hold the offset of the given instance. useful while passing or receiving packets from the wwan/imem layer 🧚
• acb_tx_sequence_nr — sequence number for the ACB header
• adb_tx_sequence_nr — sequence number for the ADB header
• acc_adb_size — statistic data for logging
• acc_payload_size — statistic data for logging
• initialized — MUX object is initialized ✅
• ev_mux_net_transmit_pending — 0 means inform the IPC tasklet to pass the accumulated uplink ADB to CP
• adb_prep_ongoing — flag for ADB preparation status

🌈 SEE ALSO 🌈

the whole friend group fr fr — kernel file ./drivers/net/wwan/iosm/iosm_ipc_mux.h union mux_cmd_param(9), struct mux_adth_dg(9), struct mux_qlth_ql(9), struct mux_qlth(9), struct mux_adb(9), struct mux_acb(9), ipc_mux_init(9), ipc_mux_deinit(9), ipc_mux_check_n_restart_tx(9), ipc_mux_get_active_protocol(9), ipc_mux_open_session(9), ipc_mux_close_session(9), ipc_mux_get_max_sessions(9)

go read them too, i'm not kidding, they're all linked for a reason 🫶

mwah 💋 that's the whole page. this one lives in ./drivers/net/wwan/iosm and it's dated October 2026 — so like, future-core of you to be reading it. bye bestie, drink water, close your sessions 🌸💖✨