csum_partial_copy_to_xdr(9)

💅 csum_partial_copy_to_xdr(9) — from the Kernel API Manual, bestie

Okay so this one's a little kernel function called csum_partial_copy_to_xdr, and honestly? It's giving "quietly doing two jobs at once and never getting credit" energy. Come sit, I'll walk you through it 🫶

---

✨ NAME ✨

csum_partial_copy_to_xdr — checksum and copy data. That's it, that's the whole gig. Two things, one function, zero drama 🌸

---

🦋 SYNOPSIS 🦋

int csum_partial_copy_to_xdr (struct xdr_buf *xdr , struct sk_buff *skb
);

Like, it takes two args and hands you back an int. Simple, clean, iconic 👑

---

🎀 ARGUMENTS 🎀

• xdr — the target XDR buffer. This is where the data's headed, the destination, the main character's final destination if you will 💖
• skb — the source skb. This is where the data's coming from. The origin story ✨

---

🔥 DESCRIPTION 🔥

So here's the vibe: the setup is arranged so that the checksum of the UDP packet happens in parallel with the copies into the RPC client iovec. Like, at the same time. Simultaneously. Multi-tasking legend behaviour, no cap 💅

And this explanation is signed off with "-DaveM" — shoutout DaveM, fr fr 🙌

---

🌈 SEE ALSO 🌈

• The kernel file ./net/sunrpc/socklib.c — that's where the magic lives
• xdr_skb_read_bits(9) — sibling energy 🦋
• xprt_sock_sendmsg(9) — also in the family, go say hi 👋

---

Okay that's the whole page, you ate it up bestie 🍓 This gem lives over in ./net/sunrpc, stamped October 2026, straight from the Kernel API Manual — periodt, mwah 💜🧚