rdma_rw_ctx_post(9)

📦 version 7.3.1, in nixpkgs unstable

💅 rdma_rw_ctx_post(9) 💅

okay bestie, welcome to the Kernel API Manual — today's main character is rdma_rw_ctx_post(9), and she is literally the one who actually sends the mail. no cap. 🦋

✨ NAME ✨

rdma_rw_ctx_post — post a RDMA READ or RDMA WRITE operation 🔥

like, she doesn't plan the operation, she ships it. periodt.

🌸 SYNOPSIS 🌸

int rdma_rw_ctx_post (struct rdma_rw_ctx *ctx , struct ib_qp *qp , u32
port_num , struct ib_cqe *cqe , struct ib_send_wr *chain_wr );

she returns an int, she takes five things, and she's ready to go 💖

🎀 ARGUMENTS 🎀

  • ctx — the context to operate on. this is the vibe, the whole storyline, the set of RDMA READ/WRITE ops that's about to go live ✨
  • qp — the queue pair to operate on. your icon, your workhorse 👑
  • port_num — port num to which the connection is bound. a u32, she's specific 🧚
  • cqe — completion queue entry for the last WR. this is how the caller finds out the story ended 🙈
  • chain_wr — WR to append to the posted chain. optional bestie, but read the description before you skip her 💀

💜 DESCRIPTION 💜

okay so here's the tea, and it's genuinely good tea:

she posts the set of RDMA READ/WRITE operations described by ctx, plus any memory registration operations needed. so yeah — the memory registration ops come along for the ride, they're part of the package, no extra charge 🫶

now the important bit, pay attention:

If chain_wr is non-NULL, the WR it points to will be appended to the chain of WRs posted. 🔗

and conversely:

If chain_wr is not set, cqe must be set so that the caller gets a completion notification. 😭 no chain_wr, no cqe = no completion notification, and that's not a vibe.

like literally, one of them has to be there. it's giving "pick a lane, bestie" 💅

🌈 SEE ALSO 🌈

the whole friend group, fr fr — plus the kernel file where she lives:

go read them, iykyk 📚✨

and that's the whole page, bestie!! 🍓 signed off from ./drivers/infiniband/core, dated October 2026, in the Kernel API Manual — mwah, slay, go post some WRs 💖🎀🦋

📦 where this page comes from