gb_message_send(9)

💌 gb_message_send(9) — the send-a-greybus-message glow-up

okay bestie, welcome to the gb_message_send(9) page in the Kernel API Manual — this is the one where we send a greybus message using HDLC over UART. iconic behavior, honestly. 💅✨

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✨ NAME ✨

gb_message_send — send greybus message using HDLC over UART. no cap, that's the whole name vibe. 🛰️💖

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🛰️ SYNOPSIS 🛰️

here's the signature, bestie — keep it exactly like this, no autocorrect energy:

int gb_message_send (struct gb_host_device *hd , u16 cport , struct gb_message *msg , gfp_t mask );

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🫶 ARGUMENTS 🫶

okay so these are the four things this function is obsessed with:

• hd — pointer to greybus host device
• cport — AP cport where message originates
• msg — greybus message to send
• mask — gfp mask

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🧚 DESCRIPTION 🧚

bestie, the Greybus HDLC frame has the following payload:

1. le16 cport
2. gb_operation_msg_hdr msg_header
3. u8 *msg_payload

that's the payload lineup — literally those three, in that order. 🌸✨

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👑 SEE ALSO 👑

if you're going down the rabbit hole (and honestly, same), these are the references this page points at:

• Kernel file ./drivers/greybus/gb-beagleplay.c
• struct gb_beagleplay(9)
• struct hdlc_payload(9)
• struct hdlc_greybus_frame(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)
• cc1352_bootloader_empty_pkt(9)

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mwah 💖 — this page lives in the ./drivers/greybus corner, October 2026 edition, and it's sending you all the bestie energy. 🎀🦋