t4_read_reg64(9)

💖 t4_read_reg64 — the Kernel API Manual, bestie edition 💖

okay so real talk, this one lives in the Kernel API Manual (yes, the big one, the main-character manual) and it's genuinely one of the simplest little icons in the whole book. So short. So powerful. Slay.

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✨ NAME ✨

t4_read_reg64 — literally just reads a 64-bit HW register. that's the whole vibe. no cap. 🎀

🌸 SYNOPSIS 🌸

u64 t4_read_reg64 (struct adapter *adapter , u32 reg_addr );

like, you hand it an adapter and an address and it hands you back a u64. the way that signature just works?? obsessed. 💅

🫶 ARGUMENTS 🫶

• adapter — the adapter 👑 (yes bestie, the adapter, it's giving "there's only one and you know which one")
• reg_addr — the register address 📍

🦋 DESCRIPTION 🦋

Returns the 64-bit value of the given HW register. ✨

that's it. that's the whole paragraph. it goes in, it grabs the 64-bit value of the HW register you asked about, it comes back. no drama, no side quests, no undefined behaviour lurking in the shadows. a wholesome, well-adjusted little function fr fr 💜

🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/ethernet/chelsio/cxgb4vf/adapter.h 📁 (go look at the header bestie, it's right there)
• t4_read_reg(9) — the 32-bit sibling, shorter king energy
• t4_write_reg(9) — writes instead of reads, chaotic but valid
• t4_write_reg64(9) — bigger write, bigger vibe
• port_name(9) — names the port 🏷️
• t4_os_set_hw_addr(9) — sets the HW address
• netdev2pinfo(9) — converts a netdev to pinfo
• adap2pinfo(9) — converts an adapter to pinfo
• netdev2adap(9) — converts a netdev to an adapter

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💀 tiny warning from your girl: this page gives you the value, but it does not promise anything extra, so don't go inventing behaviour that isn't written down. iykyk. read the register, get the value, move on. periodt. 💅

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🎀 okay that's the page!! sourced from ./drivers/net/ethernet/chelsio... and dated October 2026 — note that date bestie, it's literally from the future, and the manual name up top is t4_read_reg64(9) in case you forgot already 🙈💖 bye, ily, go read your registers responsibly 🦋✨