tid_rdma_fin...ys_blocks_4k(9)

🌸 tid_rdma_fin...ys_blocks_4k(9) — the Kernel API Manual moment 💅

okay so this is a page from the Kernel API Manual, bestie, and the star of the show is tid_rdma_find_phys_blocks_4k. yes the header truncates it with ... like it's too iconic to spell out fully. we move.

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✨ NAME ✨

tid_rdma_find_phys_blocks_4k — get groups base on mr info 🫶

(not me keeping the original grammar exactly, that's the whole point, no editing the vibes of the kernel)

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🎀 SYNOPSIS 🎀

u32 tid_rdma_find_phys_blocks_4k (struct tid_rdma_flow *flow , struct
       page **pages , u32 npages , struct tid_rdma_pageset *list );

like, it takes four things and gives you back a u32. that's the whole arc. she's literally a function. 💖

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🌈 ARGUMENTS 🌈

• flow — the overall info for a TID RDMA segment. like the big picture, the main character energy of the whole segment 👑
• pages — pointer to an array of page structs. a whole little ensemble cast of pages, and this is the pointer to them 💫
• npages — number of pages. yes bestie, we are counting them, it's giving accountability ✨
• list — page set array to return. this is where the answer goes, so like, hand her an empty container and she fills it 🎁

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🦋 DESCRIPTION 🦋

okay so here's the tea: this routine returns the number of groups associated with the current sge information. fr fr, that's what it does. 🔥

and the way it works? this implementation is based on the expected receive find_phys_blocks — but adjusted to use the MR information vs. the pfn. so it's the glow-up version of the original, using MR info instead of pfn. periodt. 💅

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⭐ RETURN ⭐

the number of RcvArray entries 💖 that's it, that's the return value, no cap.

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🌸 SEE ALSO 🌸

so much lore, i'm obsessed. this whole little universe lives in the kernel file ./drivers/infiniband/hw/hfi1/tid_rdma.c and honestly you should go read all of these:

• TID RDMA READ protocol(9)
• qp_to_rcd(9)
• lock ordering(9)
• kernel_tid_waiters(9)
• dequeue_tid_waiter(9)
• queue_qp_for_tid_wait(9)
• __trigger_tid_waiter(9)
• tid_rdma_schedule_tid_wakeup(9)
• tid_rdma_trigger_resume(9)
• kern_reserve_flow(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)

iykyk 🧚 (and yes, the 8k sibling is right there in the list, she's the twin, we love her too 💜)

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ok genuine warning-ish aside for the record: this page's listed source path is ./drivers/infiniband/hw/hfi1 and the date on it is October 2026, and the truncated title tid_rdma_fin...ys_blocks_4k(9) is literally the header/footer text as written. no inventing, no guessing, we just report the facts cutely 💀

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and that's the whole page bestie!! sourced straight from ./drivers/infiniband/hw/hfi1, dated October 2026, filed under tid_rdma_fin...ys_blocks_4k(9) 🎀 stay hydrated, read your kernel docs, slay 💖✨