qp_to_sdma_engine(9)

💅 qp_to_sdma_engine(9) — like, the Kernel API Manual entry you didn't know you needed 🎀

okay so bestie, welcome to the glow-up of qp_to_sdma_engine(9) from the Kernel API Manual. this one's short and sweet but it's lowkey important, so let's get into it fr fr ✨

---

✨ NAME ✨

qp_to_sdma_engine — map a qp to a send engine 🦋

like, you hand it a qp, it hands you back the send engine. matchmaker energy honestly 💖

---

🌸 SYNOPSIS 🌸

struct sdma_engine * qp_to_sdma_engine (struct rvt_qp *qp , u8 sc5 );

that's the whole thing, no cap. one function, two args, one send engine (or a NULL, we'll get there 🙈).

---

🫶 ARGUMENTS 🫶

• qp — the QP 👑 like, the queue pair in question, the main character of this whole operation
• sc5 — the 5 bit sc ⭐ exactly five bits of sc, not four, not six, five. we love a specific queen

---

🔥 RETURN 🔥

a send engine for the qp 💫 … or NULL for SMI type qp 💀

so yeah — if it's an SMI type qp, you get NULL. that's not an error bestie, that's just how it is, don't come for me 😭

---

🌈 SEE ALSO 🌈

• Kernel file ./drivers/infiniband/hw/hfi1/qp.c 🎀
• hfi1_setup_wqe(9)
• _hfi1_schedule_send(9)
• hfi1_schedule_send(9)
• qp_to_send_context(9)
• qp_iter_print(9)
• hfi1_qp_iter_cb(9)
• hfi1_error_port_qps(9)

go read those too, iykyk 📚✨

---

and that's the whole page bestie, you ate that 💅 this iconic little number lives over in ./drivers/infiniband/hw/hfi1 and the manual's dated October 2026 — so yeah, slightly future-coded of it, but we stan a forward-thinking manpage 🧚💜