hfi1_set_fast(9)

💅 hfi1_set_fast(9) — Kernel API Manual, bestie edition ✨

Okay so real talk, this one's a tiny little kernel function from the hfi1 driver, and it lives its whole life doing one iconic thing: flipping your receive context over to the fast handler. That's it. That's the whole vibe. Lowkey obsessed with the efficiency. 🦋

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✨ NAME ✨

hfi1_set_fast — the glow-up moment where you switch to the fast handler. slay. 💅

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🌸 SYNOPSIS 🌸

void hfi1_set_fast (struct hfi1_ctxtdata *rcd );

Yup, that's the whole signature. Returns nothing (void), takes one pointer. Short king. 👑

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🎀 ARGUMENTS 🎀

• rcd — the receive context 💖 (it's a struct hfi1_ctxtdata *, and it's the thing getting the fast-path treatment, periodt)

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🦋 SEE ALSO 🦋

okay so this is the friend group, and they're all in the kernel file ./drivers/infiniband/hw/hfi1/hfi.h — go say hi to all of them, no cap:

• rcvhdrq_size(9)
• hfi1_get_rc_ohdr(9)
• hfi1_rcd_head(9)
• hfi1_set_rcd_head(9)
• hfi1_seq_incr_wrap(9)
• hfi1_seq_cnt(9)
• hfi1_set_seq_cnt(9)
• last_rcv_seq(9)
• get_hdrqentsize(9)
• get_hdrq_cnt(9)
• hfi1_is_slowpath(9)
• hfi1_is_fastpath(9)
• sc_to_vlt(9)
• hfi1_may_ecn(9)
• hfi1_rcvhdrtail_kvaddr(9)
• hfi1_need_drop(9)

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ngl bestie, if you're reading the kernel docs for a receive-context fast-path flip, you're already the main character of your own networking stack 🌈💜

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That's the whole page, fr fr — brought to you by ./drivers/infiniband/hw/hfi1, dated October 2026, and filed under hfi1_set_fast(9) 🎀✨ mwah, bye bestie 🫶