hfi1_get_rc_ohdr(9)

🌸 hfi1_get_rc_ohdr 💅

okay so bestie, we're in hfi1_get_rc_ohdr(9) — yes that's the Kernel API Manual side of the house, section 9, driver land, no cap. this little function is literally about grabbing the extended header, and the @opah is the opaheader. that's the whole vibe. main character energy for one (1) job 🫶

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✨ NAME ✨

hfi1_get_rc_ohdr — get extended header, where the @opah is the opaheader. that's it. that's the function. iconic, honestly 🎀

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🦋 SYNOPSIS 🦋

struct ib_other_headers * hfi1_get_rc_ohdr (struct hfi1_opa_header *opah
);

so we take in a struct hfi1_opa_header * and we hand back a struct ib_other_headers *. slay. 💖

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🌈 ARGUMENTS 🌈

• opah — -- undescribed -- 😭 so pretty much nobody documented this one. it's the opaheader pointer, bestie, that's what you're holding. like, the kernel-doc generator straight up had nothing for us here. we're all just vibing with the mystery 🙈

ngl that -- undescribed -- is doing a lot of heavy lifting. it's giving "left as an exercise for the reader." but fr fr, opah is the opaheader you're passing in. periodt.

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👑 SEE ALSO 👑

okay so if you're gonna be nosy about this whole receive-header situation (and you should be, it's lowkey fascinating), go read the kernel file ./drivers/infiniband/hw/hfi1/hfi.h and then cry a little over this absolutely stacked roster of friends:

• rcvhdrq_size(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)
• hfi1_set_fast(9)
• sc_to_vlt(9)
• hfi1_may_ecn(9)
• hfi1_rcvhdrtail_kvaddr(9)
• hfi1_need_drop(9)

the way that's sixteen man pages. SIXTEEN. someone was thorough and we respect it so much 🔥💜

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that's the whole page, bestie — short, sweet, and utterly undocumented on the argument side. this ✨masterpiece✨ comes to you from the kernel source at ./drivers/infiniband/hw/hfi1, dated October 2026, and it will forever be known as hfi1_get_rc_ohdr(9) 💫 go forth and get that extended header 🦋