__rxe_lookup_mcg(9)

📦 version 7.3.1, in nixpkgs unstable

✨ __rxe_lookup_mcg (9) ✨

okay so bestie, we're in the Kernel API Manual today and this one's a lil internal helper from the RDMA crew 💅 it's lowkey a backstage-pass situation, so let's get into it 🎀

🌸 NAME 🌸

__rxe_lookup_mcg — lookup mcg in rxe->mcg_tree while holding lock 🔒

like, the whole personality of this function is "I do my thing while you're already holding the lock," iykyk 😌

🦋 SYNOPSIS 🦋

struct rxe_mcg * __rxe_lookup_mcg (struct rxe_dev *rxe , union ib_gid
*mgid );

that's the whole signature, no cap ✨ two args, returns a pointer to struct rxe_mcg 🫶

💖 ARGUMENTS 💖

  • rxe — the rxe device object 🧚 your main character, the device we're digging around in
  • mgid — multicast IP address 📬 the thing we're looking for

🔥 CONTEXT 🔥

caller must hold rxe->mcg_lock ⚠️

fr fr, this is not optional — the double underscore in the name is literally telling you "lock's already held, don't come in here unlocked" 💀 bestie pls respect the lock 🙈

👑 RETURN 👑

on success you get mcg and it takes a ref to mcg 💅 (yes, you're on the hook for that reference, so be a responsible icon and drop it later ✨). otherwise you get NULL 🫠

🌈 SEE ALSO 🌈

Kernel file ./drivers/infiniband/sw/rxe/rxe_mcast.c — the whole multicast fam, and honestly? iconic lineup 🎀

and that's the page, bestie 🍓 this cutie lives over in ./drivers/infiniband/sw/rxe, and the version vibes are dated October 2026 — so yeah, future girl summer ⭐ go forth and lock responsibly 💜

📦 where this page comes from