ixgbe_read_phy_reg_x550a(9)

📦 version 7.3.1, in nixpkgs unstable

💖 ixgbe_read_phy_reg_x550a 💖

okay bestie, welcome to the Kernel API Manual ✨ this one's a lil function page from the kernel docs, and honestly? it's giving "small function, big responsibilities." let's get into it 🫶

🌸 NAME 🌸

ixgbe_read_phy_reg_x550a — literally just reads a specified PHY register. that's the whole gig. icon behaviour 💅

✨ SYNOPSIS ✨

int ixgbe_read_phy_reg_x550a (struct ixgbe_hw *hw , u32 reg_addr , u32
device_type , u16 *phy_data );

so it returns an int, and it takes four things. we love a four-argument moment 🔥

🎀 ARGUMENTS 🎀

  • hw — pointer to the hardware structure. yes the whole hardware struct. she's the main character here 👑
  • reg_addr — the 32 bit address of the PHY register you wanna read. 32 bits, no cap 🧚
  • device_type — the 5 bit device type. only five bits bestie, she's smol 🦋
  • phy_data — pointer where the data read from the PHY register lands. it's a u16 * and that's where the answer shows up 💖

🦋 DESCRIPTION 🦋

so here's the vibe: this function reads a value from a specified PHY register using the SWFW lock and the PHY Token ✨

and why do we need the PHY Token, you ask? because the MDIO is shared between two MAC instances 😭 so yeah, the token is doing the whole "excuse me, i'm using this" energy. necessary. no cap 🙈

🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c — go read her, she's iconic 📖

and now, the friend group (long list, but they all matter, don't skip 💀):

like i said. big friend group. but every single one is in the group chat 💜

ngl bestie, if you're poking at PHY registers on X550a hardware, remember the MDIO is shared between two MAC instances — that's literally why the PHY Token exists 🌸

and that's the page!! mwah 💋 source is ./drivers/net/ethernet/intel/i... (yes it's truncated in the original, she's mysterious like that 🎀), dated October 2026, version-tagged ixgbe_read_phy_reg_x550a(9). slay, go read some registers 🦋✨💖

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