svc_rdma_pre..._reply_chunk(9)

📦 version 7.3.1, in nixpkgs unstable

✨ svc_rdma_prepare_reply_chunk(9) ✨

okay bestie, welcome to the Kernel API Manual 💖 this one is a whole little function in the sunrpc/xprtrdma world and honestly it's giving "quietly doing the most." let's get into it 🫶

🌸 NAME 🌸

svc_rdma_prepare_reply_chunk — literally builds the WR chain for writing the Reply chunk 🔥 that's it, that's the job, and she does it well

🎀 SYNOPSIS 🎀

int svc_rdma_prepare_reply_chunk (struct svcxprt_rdma *rdma , const
struct svc_rdma_pcl *write_pcl , const struct svc_rdma_pcl *reply_pcl ,
struct svc_rdma_send_ctxt *sctxt , const struct xdr_buf *xdr );

🦋 ARGUMENTS 🦋

  • rdma — the controlling RDMA transport 💅 she's the main character, everyone reports to her
  • write_pcl — the Write chunk list, hand-delivered by the client 📋
  • reply_pcl — the Reply chunk, also from the client, also iconic 👑
  • sctxt — the Send WR resources ✨ all the stuff you need to actually push a send out into the world
  • xdr — the xdr_buf holding an RPC Reply 🍓 the actual payload vibes

🌈 DESCRIPTION 🌈

so what does she return? glad you asked 💖

She hands back a non-negative number — that's the count of bytes the chunk consumed. slay. but if things go sideways (and they might, ngl), here's the whole mood ring of negative returns:

  • -E2BIG — the payload was larger than the Reply chunk 😭 too much stuff, not enough room
  • -EINVAL — the client provided too many segments 🙈 like, ma'am, that's too many
  • -ENOMEM — the rdma_rw context pool was exhausted 💀 out of contexts, out of patience
  • -ENOTCONN — posting failed because the connection is lost 🫠 it's gone, bestie
  • -EIO — rdma_rw initialization failed (DMA mapping, etc.) ⚡ the low-level stuff said no
no cap, every one of those error codes matters — check which one you got before you start guessing 💜

⭐ SEE ALSO ⭐

the kernel file in question, for the girls who like to read the source:

./net/sunrpc/xprtrdma/svc_rdma_rw.c

and the whole friend group 💅:

and that's the whole page, bestie ✨ this cutie lives in ./net/sunrpc/xprtrdma and she was dated October 2026 — go off, calendar queen 👑🦋💖

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