queue_qp_for_tid_wait(9)

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

okay so real talk, this is a page from the Kernel API Manual and it's about queue_qp_for_tid_wait — say that five times fast, I dare you 😭 it's a lil function that puts a QP to sleep on tid space, and honestly? it ate.

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✨ NAME ✨

queue_qp_for_tid_wait — suspend QP on tid space 🦋

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✨ SYNOPSIS ✨

void queue_qp_for_tid_wait (struct hfi1_ctxtdata *rcd , struct tid_queue
*queue , struct rvt_qp *qp );

like, that's the whole signature, no cap. void return, three args, she's neat 💅

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✨ ARGUMENTS ✨

• rcd — the receive context 👑 this is the whole vibe, the main character
• queue — the queue to operate on 🎀 the one getting the work
• qp — the qp 🌸 yes that's genuinely all the original says about it, so I'm not gonna invent lore

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✨ DESCRIPTION ✨

So here's what goes down, bestie: the qp gets inserted at the tail of the rcd wait queue 🔥 and the HFI1_S_WAIT_TID_SPACE s_flag gets set. That's it. That's the whole function. She queues and she flags, periodt 💖

⚠️ okay important, do NOT skip this: must hold the qp s_lock and the exp_lock. like, both of them. this is a hard requirement, not a suggestion, she will not be held responsible for what happens if you don't 🙈

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✨ SEE ALSO ✨

go read these next, i'm obsessed with this whole little friend group 🫶

• Kernel file ./drivers/infiniband/hw/hfi1/tid_rdma.c
• TID RDMA READ protocol(9)
• qp_to_rcd(9)
• lock ordering(9)
• kernel_tid_waiters(9)
• dequeue_tid_waiter(9)
• __trigger_tid_waiter(9)
• tid_rdma_schedule_tid_wakeup(9)
• tid_rdma_trigger_resume(9)
• kern_reserve_flow(9)
• tid_rdma_find_phys_blocks_4k(9)
• tid_flush_pages(9)
• tid_rdma_find_phys_blocks_8k(9)
• hfi1_kern_exp_rcv_setup(9)
• hfi1_kern_exp_rcv_free_flows(9)
• __trdma_clean_swqe(9)
• hfi1_schedule_tid_send(9)

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and that's the page!! 💜 this icon lived in ./drivers/infiniband/hw/hfi1 and was dated October 2026 — bestie, mark your calendar, she's from the future ⭐🍓 go touch some tid space, ily, bye 😭👑