nfp_net_write_mac_addr(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 nfp_net_write_mac_addr(9) — like, the Kernel API Manual page for it 🌸

okay bestie, welcome to section 9 of the Kernel API Manual, where we learn how to yeet a MAC address straight into the device control BAR 💅 no cap, it's a whole little function and it's lowkey iconic.

✨ NAME ✨

nfp_net_write_mac_addr — write mac address to the device control BAR 🎀

🦋 SYNOPSIS 🦋

void nfp_net_write_mac_addr (struct nfp_net *nn , const u8 *addr );

like, that's it. that's the whole vibe. it returns nothing (void), it just does the thing ✨

🎀 ARGUMENTS 🎀

  • nn — the NFP Net device you're reconfiguring, the main character of this operation 👑
  • addr — the MAC address to write, aka the payload, the moment, the ~content~ 🍓

💖 DESCRIPTION 💖

So the way that this works is: it writes the MAC address from the netdev to the device control BAR. simple enough, right? 🫶

BUT — and this is the important part, bestie, do not skip this — it does not perform the required reconfig. it's giving "I did my one job and I did it well, the rest is not my problem" 😭 so don't come for it later when stuff isn't reconfigured, okay?

Also, we do a little byte swapping dance 💃 because firmware is LE. that's it, that's the dance. LE firmware, bytes get swapped, we move on. iykyk 🌈

🧚 SEE ALSO 🧚

Kernel file ./drivers/net/ethernet/netronome/nfp/nfp_net_common.c — go read it, it's literally right there 📖

and now, the friend group, the whole squad, the entire roster (do not lose a single one of them, they all matter fr fr):

💀 friendly reminder from your local gen z unix girlie: this function writes the MAC and dips. the required reconfig? not her job. she said "not me doing that" and left. periodt.

mwah 💜 this page came from the kernel source file ./drivers/net/ethernet/netrono... and it's dated October 2026 — that's the version, that's the date, and yes we're still here writing MAC addresses to BARs. slay. 🎀✨

📦 where this page comes from