usb_endpoint_maxp(9)

💅 usb_endpoint_maxp(9) — the Kernel API Manual, bestie edition 🎀

okay so welcome to the Kernel API Manual, and today's main character is usb_endpoint_maxp(9). she's short, she's sweet, she returns a number. let's get into it ✨

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🌸 NAME 🌸

usb_endpoint_maxp — grab that endpoint's max packet size, no cap 💖

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🦋 SYNOPSIS 🦋

int usb_endpoint_maxp (const struct usb_endpoint_descriptor *epd );

yes that's the whole thing. one function, one argument, one int coming right back at you 🫶

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🍓 ARGUMENTS 🍓

• epd — the endpoint you want checked 👀 literally just hand her the endpoint descriptor and she'll do the rest, iykyk

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✨ DESCRIPTION ✨

she returns epd's max packet bits, and the bits she wants are [10:0] 💅

that's it. that's the function. bits [10:0], nothing more, nothing less — lowkey iconic for how unbothered she is 🌈

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🔥 SEE ALSO 🔥

the whole friend group, fr fr 🫶 take a little tour:

• kernel file ./include/uapi/linux/usb/ch9.h
• struct usb_ctrlrequest(9)
• usb_endpoint_num(9)
• usb_endpoint_type(9)
• usb_endpoint_dir_in(9)
• usb_endpoint_dir_out(9)
• usb_endpoint_xfer_bulk(9)
• usb_endpoint_xfer_control(9)
• usb_endpoint_xfer_int(9)
• usb_endpoint_xfer_isoc(9)
• usb_endpoint_is_bulk_in(9)
• usb_endpoint_is_bulk_out(9)
• usb_endpoint_is_int_in(9)
• usb_endpoint_is_int_out(9)
• usb_endpoint_is_isoc_in(9)
• usb_endpoint_is_isoc_out(9)
• usb_endpoint_maxp_mult(9)

like, she keeps good company 💜

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ngl this page is from ./include/uapi/linux/usb and it's dated October 2026 — and the header up top is usb_endpoint_maxp(9), so now you know exactly where she lives 🧚 mwah, go read some endpoints bestie 💖👑