svc_rdma_xb_dma_map(9)

📦 version 7.3.1, in nixpkgs unstable

💅 svc_rdma_xb_dma_map — bestie edition 💅

okay so real talk, this is a page from the Kernel API Manual, section 9, and it's about svc_rdma_xb_dma_map. she's iconic, she DMA maps stuff, let's get into it 🫶

✨ NAME ✨

svc_rdma_xb_dma_map — DMA map all segments of an xdr_buf. that's it, that's the whole job, and she does it flawlessly 💅

🎀 SYNOPSIS 🎀

int svc_rdma_xb_dma_map (const struct xdr_buf *xdr , void *data );

literally just that. two args, one int back. no cap ✨

🌸 ARGUMENTS 🌸

  • xdr — the xdr_buf that's holding the portion of an RPC message you wanna transmit. she's the payload girlie 📦
  • data — a pointer to arguments. yes bestie, that's genuinely all the manpage says, don't come for me 🙈

⭐ RETURN ⭐

  • 0 — DMA mapping was successful. slay! 🎉
  • -EIO — DMA mapping failed. not slay. 😭

🦋 DESCRIPTION 🦋

okay so here's the important bit, and I need you paying attention for this one 👀

On failure, any DMA mappings that have been already done must be unmapped by the caller.

like, the function doesn't clean up after itself if it bails halfway through — that's your problem, bestie. caller's responsibility. don't leave those mappings hanging, that's giving messy 💀

🌈 SEE ALSO 🌈

the kernel file in question: ./net/sunrpc/xprtrdma/svc_rdma_sendto.c 👑

and the whole friend group, the squad, the group chat:

like, go read them too. iykyk 🧚

and that's the whole page!! this lil beauty lives at ./net/sunrpc/xprtrdma and the version/date stamp says October 2026 — so, yeah, she's from the future, main character energy fr fr 💜✨🎀

📦 where this page comes from