rdma_connect(9)

💫 rdma_connect(9) — Kernel API Manual, bestie edition 💫

okay so this is rdma_connect, from the Kernel API Manual, and honestly? she's kind of a big deal. active connection requests, remote QPs, the whole vibe. let's get into it 🫶

---

✨ NAME ✨

rdma_connect — literally Initiate an active connection request. that's the whole job and she does it slayfully 💅

---

🌸 SYNOPSIS 🌸

int rdma_connect (struct rdma_cm_id *id , struct rdma_conn_param
*conn_param );

---

🎀 ARGUMENTS 🎀

• id — the Connection identifier that you're connecting. it's the main character of this whole operation ngl 👑
• conn_param — Connection information used for connected QPs. the little bundle of details that rides along ✨

---

🦋 DESCRIPTION 🦋

okay so before you even think about calling this, you have to have resolved a route for the rdma_cm_id you're connecting with — like, you literally must have called rdma_resolve_route first. no route, no connect, that's the rule 🚨

then this call does one of two things, depending on the vibe:

• it either connects to a remote QP, or
• it obtains remote QP information for unconnected rdma_cm_id's

and which one actually happens? it's based on the rdma_cm_id's port space. that's the deciding factor, periodt 💯

fr fr, don't skip the rdma_resolve_route step — this routine expects it to have already happened 🙈

---

🌈 SEE ALSO 🌈

Kernel file ./drivers/infiniband/core/cma.c — and the whole friend group:

• rdma_is_consumer_reject(9)
• rdma_iw_cm_id(9)
• cma_acquire_dev_by_src_ip(9)
• cma_ib_acquire_dev(9)
• rdma_set_ack_timeout(9)
• rdma_set_min_rnr_timer(9)
• rdma_connect_locked(9)
• rdma_connect_ece(9)
• rdma_accept(9)

---

and that's the page!! 🧚 this iconic little number lives in ./drivers/infiniband/core, and the version you're reading is the October 2026 one — mwah, tysm for reading, ily, go resolve that route bestie 💖🎀💜