sdma_txadd_kvaddr(9)

💅 sdma_txadd_kvaddr(9) — like, the Kernel API Manual page, bestie ✨

okay so real talk, this is a page from the Kernel API Manual and it's about sdma_txadd_kvaddr, which is a whole function that adds a kernel virtual address to an sdma_txreq. it's giving "plumbing but make it lowkey iconic" 🫶

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🎀 NAME 🎀

sdma_txadd_kvaddr — adds a kernel virtual address to sdma_txreq. no cap, that's literally the whole job 💅

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✨ SYNOPSIS ✨

int sdma_txadd_kvaddr (struct hfi1_devdata *dd , struct sdma_txreq *tx ,
void *kvaddr , u16 len );

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🌸 ARGUMENTS 🌸

• dd — the device you're using for mapping 👑
• tx — the sdma_txreq that this page is getting added to 🎀
• kvaddr — the kernel virtual address, yes ma'am 🦋
• len — length in bytes, keep it cute and keep it counted 💖

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🦋 DESCRIPTION 🦋

so this one is used to add a descriptor that's referenced by the kvaddr and len you just passed in. that's the vibe 🌈

and the mapping and unmapping of kvaddr and len? automatically handled, bestie. not you having to do it yourself 😭👑

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🔥 RETURN 🔥

• 0 — success, slay ✨
• -ENOSPC — mapping fail 💀
• -ENOMEM — couldn't extend/coalesce the descriptor array 🙈

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💜 SEE ALSO 💜

• Kernel file ./drivers/infiniband/hw/hfi1/sdma.h
• sdma exported routines(9)
• sdma PSM/verbs API(9)
• Infrastructure calls(9)
• struct sdma_engine(9)
• sdma_empty(9)
• sdma_running(9)
• sdma_txinit_ahg(9)
• sdma_txinit(9)
• sdma_txadd_page(9)
• sdma_txadd_daddr(9)
• sdma_progress(9)
• struct sdma_map_elem(9)
• sdma_engine_progress_schedule(9)

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fr fr that's the whole page, and like, go read the rest of them too 🧚

this one lives in ./drivers/infiniband/hw/hfi1, dated October 2026, and it answers to the name sdma_txadd_kvaddr(9) — periodt 💅⭐🍓