STRUCT MOST_CHANNEL_CONFIG(9)

🦋 struct most_channel_config(9) — the glow-up 🦋

okay so bestie, we're in the Kernel API Manual today and the main character is struct most_channel_config. it's giving "little struct, huge responsibilities" ngl 💅

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✨ NAME ✨

struct most_channel_config — literally just stores channel configuration, no cap 💖

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🌸 SYNOPSIS 🌸

struct most_channel_config {
    enum most_channel_direction direction;
    enum most_channel_data_type data_type;
    u16 num_buffers;
    u16 buffer_size;
    u16 extra_len;
    u16 subbuffer_size;
    u16 packets_per_xact;
    u16 dbr_size;
 };

look at those fields all lined up like a fit check 🔥 everything copied exactly, don't come for me 🙈

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🎀 Members 🎀

• direction — which way the channel goes. yes bestie, direction matters in life and in MOST 💅
• data_type — the type of data travelling over this channel. it's giving "what's in the bag" 👜
• num_buffers — number of buffers. simple. iconic. no notes ✨
• buffer_size — size of a buffer for AIM. heads up tho: this buffer size may be cutted down by HDM in a configure callback to match a given interface and channel type 😭 so don't get too attached to your number
• extra_len — additional buffer space for internal HDM purposes like padding. may be set by HDM in a configure callback if needed 🫶
• subbuffer_size — size of a subbuffer. sub. buffer. size. we love a literal king 👑
• packets_per_xact — number of MOST frames that are packet inside one USB packet. super USB specific, so don't try to make it a personality trait elsewhere 💀
• dbr_size — DBR data buffer size. MediaLB communication only, bestie — if you're not on MediaLB this field is not your vibe 🌈

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💜 Description 💜

so like, this struct describes the configuration for a MOST channel. the tea ☕ is that this info gets provided from the MostCore to a HDM (like the Medusa PCIe Interface) as a parameter of the "configure" function call. that's it. that's the whole gig. and honestly? she ate 💅

lowkey a reminder: those HDM callbacks can absolutely mess with buffer_size and extra_len, so if your numbers come back different, that's not a bug, that's the configure callback doing its thing ✨

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👑 SEE ALSO 👑

• Kernel file ./include/linux/most.h
• enum most_interface_type(9)
• enum most_channel_direction(9)
• enum most_channel_data_type(9)
• struct most_channel_capability(9)
• struct most_interface(9)
• struct most_component(9)
• most_register_interface(9)
• most_deregister_interface(9)
• most_stop_enqueue(9)
• most_resume_enqueue(9)

a whole friend group, fr fr 🫶 go read them, iykyk 🦋

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aaaand that's the page bestie! 🎀 live from ./include/linux, dated October 2026, brought to you by the one and only struct most_channel_config(9). periodt. 💖✨🌸