STRUCT HDLC_GREYBUS_FRAME(9)

🦋 struct hdlc_greybus_frame(9) 🦋

okay bestie, welcome to the kernel API manual for struct hdlc_greybus_frame — yes, that's the whole title, and yes, it's giving very "I live in ./drivers/greybus" energy. buckle up, this one's short but she's iconic 💅

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✨ NAME ✨

struct hdlc_greybus_frame — the structure that represents a greybus HDLC frame payload 🎀

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🌸 SYNOPSIS 🌸

here's the whole vibe, copied exactly so you can't mess it up:

struct hdlc_greybus_frame {
    __le16 cport;
    struct gb_operation_msg_hdr hdr;
    u8 payload[];
 };

like, look at her. __le16 first, then the header, then a flexible array member doing its little [] thing at the end. no cap, that trailing [] is the main character 🫶

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💖 Members 💖

• cport — the cport id, literally just the id of the cport. that's it, that's the field 🌈
• hdr — the greybus operation header (struct gb_operation_msg_hdr), sitting there holding the operation info 🧚
• payload — the greybus message payload, chillin' as a u8 payload[] flexible array member at the end ⭐

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👑 Description 👑

so here's the lore: the HDLC payload that gets sent over UART for a greybus address has the cport preappended to the greybus message. that's literally the whole point of this struct — cport first, then the greybus message right behind it. periodt 💅

ngl, "preappended" is exactly what the original says, so I'm keeping it — she's iconic, don't @ me 😭

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🔥 SEE ALSO 🔥

all the besties this struct rolls with, and also the kernel file that keeps them all in ./drivers/greybus/gb-beagleplay.c:

• struct gb_beagleplay(9)
• struct hdlc_payload(9)
• enum cc1352_bootloader_cmd(9)
• enum cc1352_bootloader_status(9)
• struct cc1352_bootloader_packet(9)
• struct cc1352_bootloader_download_cmd_data(9)
• struct cc1352_bootloader_crc32_cmd_data(9)
• hdlc_write(9)
• hdlc_append(9)
• hdlc_encoded_length(9)
• hdlc_tx_frames(9)
• csum8(9)
• cc1352_bootloader_pkt_rx(9)
• gb_message_send(9)
• cc1352_bootloader_empty_pkt(9)

go read them, they're all slaying in their own little ways 💜

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and that's the whole page, bestie 🌸 this gem lives over in ./drivers/greybus, dated October 2026, and it's filed under struct hdlc_greybus_frame(9) — go forth and preappend your cports responsibly 🦋💖