t4_memory_rw(9)

📦 version 7.3.1, in nixpkgs unstable

✨ t4_memory_rw — Kernel API Manual ✨

okay so bestie, this is the t4_memory_rw(9) page and it’s literally about reading/writing firmware memory through a PCIE memory window. very demure, very kernel-coded. 💅

💖 NAME 💖

t4_memory_rw — read/write EDC 0, EDC 1 or MC via PCIE memory window. no cap, that’s the whole name vibe. 🎀

🦋 SYNOPSIS 🦋

int t4_memory_rw (struct adapter *adap , int win , int mtype , u32 addr
       , u32 len , void *hbuf , int dir );

🎀 ARGUMENTS 🎀

  • adap — the adapter. the main character struct. 👑
  • win — PCI-E Memory Window to use. pick your window, bestie. 🪟
  • mtype — memory type: MEM_EDC0, MEM_EDC1 or MEM_MC. those are the options, periodt.
  • addr — address within indicated memory type. the exact spot we’re visiting. 📍
  • len — amount of memory to transfer. how much we’re moving. 📦
  • hbuf — host memory buffer. the host-side hangout spot. 🏠
  • dir — direction of transfer T4_MEMORY_READ (1) or T4_MEMORY_WRITE (0). read or write, choose your fighter. 🔁

🌸 DESCRIPTION 🌸

okay so this function reads/writes an [almost] arbitrary memory region in the firmware. the firmware memory address and the host buffer must be aligned on 32-bit boundaries; the length may be arbitrary. yes, that alignment rule is real and you gotta respect it. 🫶

the memory is transferred as a raw byte sequence from/to the firmware’s memory. it’s giving “just bytes, no extra drama.” ✨

if this memory contains data structures which contain multi-byte integers, it’s the caller’s responsibility to perform appropriate byte order conversions. not the function’s job, bestie — the caller has to handle that. 💅

🌈 SEE ALSO 🌈

💖 that’s the whole page, bestie! source/version + date sign-off: ./drivers/net/ethernet/chelsio... · October 2026 · t4_memory_rw(9) periodt 🫶

📦 where this page comes from