t4_tp_indirect_rw(9)

📦 version 7.3.1, in nixpkgs unstable

💅 t4_tp_indirect_rw(9) — like, the Kernel API Manual, but make it make sense

okay so bestie, welcome to t4_tp_indirect_rw, straight out of the Kernel API Manual. this one's a function, it's in section 9, and it's about poking TP indirect registers — either the chill way (LDST) or the sneaky way (backdoor) 🚪✨. sit down, hydrate, let's go.

✨ NAME ✨

t4_tp_indirect_rw — reads/writes a TP indirect register, and it'll go through LDST or through the backdoor to do it 🫶

🎀 SYNOPSIS 🎀

void t4_tp_indirect_rw (struct adapter *adap , u32 reg_addr , u32 reg_data , u32 *buff , u32 nregs , u32 start_index , int rw , bool sleep_ok );

that's the whole signature, character for character, no cap. eight arguments, all main character energy 👑

🌸 ARGUMENTS 🌸

  • adap — the adapter. the whole device vibes live here 💖
  • reg_addr — the Address Register
  • reg_data — the Data register
  • buff — where the indirect register values are stored / written. like the group chat, but for registers 💬
  • nregs — how many indirect registers we're reading/writing. count 'em
  • start_index — index of the first indirect register to read/write. the starting point, the origin story ✨
  • rw — READ(1) or WRITE(0). literally the direction of travel, pick one 🧭
  • sleep_ok — if true we may sleep while awaiting command completion 😴 if false, no napping allowed, we stay awake for this one

🦋 DESCRIPTION 🦋

so basically: read/write TP indirect registers through LDST if possible. and if that's not possible? plan B, bestie — fall back to backdoor access 🚪🔥

that's the whole bit. it's giving "try the front door first, then the secret tunnel."

👑 SEE ALSO 👑

first up, the actual source, iconic behavior:

  • Kernel file ./drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

and now the entire friend group, fr fr, nobody gets left out:

💀 real talk: sleep_ok = true means we may sleep while waiting on command completion. that's the whole caveat, don't overthink it, just pass the right bool 😭

and that's the page, bestie 🎀 source/version lives at ./drivers/net/ethernet/chelsio... and the date stamp is October 2026 — mwah, go read some registers 💖✨🦋

📦 where this page comes from