is_ofld_imm(9)

📦 version 7.3.1, in nixpkgs unstable

💅 is_ofld_imm(9) — Kernel API Manual ✨

okay bestie, welcome to the Kernel API Manual entry for is_ofld_imm(9), aka the tiny little vibe-check function that tells you if a packet can ✨go out immediately✨. yes it's a real page in the manual, yes you're gonna read the whole thing, let's go 🫶

🌸 NAME 🌸

is_ofld_imm — check whether a packet can be sent as immediate data 💌

🎀 SYNOPSIS 🎀

int is_ofld_imm (const struct sk_buff *skb );

💖 ARGUMENTS 💖

  • skb — the packet, bestie. that's it, that's the argument 🦋

✨ DESCRIPTION ✨

so what does it actually do? it returns true if a packet can be sent as an offload WR with immediate data. that's the whole assignment, and it ate 🔥

but here's the tea about the size limits, because there are two of them and they are not the same number:

  • FW_OFLD_TX_DATA_WR limits the payload to 255 bytes — because of an 8-bit field, smh, the classic reason 😭
  • but FW_ULPTX_WR commands have a 256 byte immediate-only payload limit

so yeah. two different ceilings. keep that energy. iykyk 💅

ngl the numbers matter here — 255 vs 256 is literally the whole point of the check, don't mix them up 🙈

👑 SEE ALSO 👑

this is the part where the page just keeps going and going, and honestly? iconic. everything below is (9), no cap, and the kernel file in question is ./drivers/net/ethernet/chelsio/cxgb4/sge.c — go say hi to it for me 🧚

and that's the whole page, bestie, you survived the reference wall 🎉 little sign-off moment: this one's from ./drivers/net/ethernet/chelsio... and it's dated October 2026 — slay, go read a real function now, you're a kernel girlie 💜🌸

📦 where this page comes from