user_exp_rcv_clear(9)

💅 NAME 💅

okay so bestie, this is user_exp_rcv_clear from the Kernel API Manual — and it does exactly what it says on the tin: it clears the given tid rcv list. that's the whole vibe. ✨

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🦋 SYNOPSIS 🦋

int user_exp_rcv_clear (struct hfi1_filedata *fd , unsigned long arg ,
u32 len );

like, that's the signature, copy it exactly, no cap 🫶

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🎀 ARGUMENTS 🎀

• fd — the file data of the current driver instance. it's giving "who am I, where am I from" energy 💁‍♀️
• arg — the ioctl argument carrying the user space information. this is how userspace slides its info into the kernel ✨
• len — the length of the data structure that goes with the ioctl command. gotta know how much we're working with, fr fr 📏

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🌸 DESCRIPTION 🌸

so here's the tea, bestie: hfi1_user_exp_rcv_clear can get called from the error path 😭 and because of that little plot twist, we need to use this wrapper to copy the user space information before doing the clear. like, copy first, clear second — order matters, periodt. 👑

no skipping the copy step. the wrapper is the whole point. the wrapper is the main character. 💅

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🌈 SEE ALSO 🌈

the kernel file ./drivers/infiniband/hw/hfi1/file_ops.c is the home base for all of these icons 👑:

• complete_subctxt(9)
• match_ctxt(9)
• find_sub_ctxt(9)
• user_exp_rcv_setup(9)
• user_exp_rcv_invalid(9)
• manage_rcvq(9)
• ctxt_reset(9)

go read them, iykyk 📚✨

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and that's the page!! 🎀 brought to you by ./drivers/infiniband/hw/hfi1, stamped October 2026, and signed off with user_exp_rcv_clear(9) — slay, bye bestie 💖🦋