STRUCT TXENTRY_DESC(9)

💖 NAME 💖

hey bestie, welcome to the Kernel API Manual ✨ this is the page for struct txentry_desc — the TX Entry descriptor, and it's literally the main character of this whole file 🫶

🌸 SYNOPSIS 🌸

okay so the shape is literally this, no cap:

       struct txentry_desc {
           unsigned long flags;
           u16 length;
           u16 header_length;
           union {
             struct {
               u16 length_high;
               u16 length_low;
               u16 signal;
               u16 service;
               enum ifs ifs;
             } plcp;
             struct {
               u16 mcs;
               u8 stbc;
               u8 ba_size;
               u8 mpdu_density;
               enum txop txop;
               int wcid;
             } ht;
           } u;
           enum rate_modulation rate_mode;
           short retry_limit;
           enum cipher cipher;
           u16 key_idx;
           u16 iv_offset;
           u16 iv_len;
        };

💅 Members 💅

• flags — descriptor flags, and yes she's pointing you at enum queue_entry_flags 🚩
• length — length of the entire frame, periodt 📏
• header_length — length of the 802.11 header, iconic little header moment ✨
• rate_mode — rate mode, and it says see enum rate_modulation 💫
• retry_limit — max number of retries, like how many times you're willing to try again 😭
• cipher — cipher type used for encryption 🔐
• key_idx — key index used for encryption 🔑
• iv_offset — position where IV should be inserted by hardware, fr fr 🛠️
• iv_len — length of IV data 📦

✨ Description ✨

summary of information for the frame descriptor before sending a TX frame 💖 that's the vibe: it's the little descriptor info hangout before the TX frame goes out 🦋

🔥 SEE ALSO 🔥

the kernel file to peek at is ./drivers/net/wireless/ralink/rt2x00/rt2x00queue.h 👑

and the whole reference lineup, in order, is:

• Entry frame size(9)
• enum data_queue_qid(9)
• enum skb_frame_desc_flags(9)
• struct skb_frame_desc(9)
• get_skb_frame_desc(9)
• enum rxdone_entry_desc_flags(9)
• RXDONE_SIGNAL_MASK(9)
• struct rxdone_entry_desc(9)
• enum txdone_entry_desc_flags(9)
• struct txdone_entry_desc(9)
• enum txentry_desc_flags(9)
• enum queue_entry_flags(9)
• struct queue_entry(9)
• enum queue_index(9)
• enum data_queue_flags(9)
• struct data_queue(9)
• queue_end(9)
• tx_queue_end(9)
• queue_next(9)
• queue_loop(9)
• queue_for_each(9)
• tx_queue_for_each(9)
• txall_queue_for_each(9)
• rt2x00queue_for_each_entry(9)
• rt2x00queue_empty(9)
• rt2x00queue_full(9)
• rt2x00queue_threshold(9)
• rt2x00queue_dma_timeout(9)
• _rt2x00_desc_read(9)
• rt2x00_desc_read(9)
• rt2x00_desc_write(9)

mwah 💋 this page is coming at you from the Kernel API Manual; source/version is ./drivers/net/wireless/ralink/..., the date is October 2026, and the manual page is struct txentry_desc(9) — bye bestie, slay your TX descriptors responsibly 🫶🌈