rxe_lookup_mcg(9)

✨ rxe_lookup_mcg — bestie's guide to finding your mcg ✨

okay so this is a page from the Kernel API Manual, and the star of the show is rxe_lookup_mcg(9) — like, that's the function, that's the whole vibe. it lives in the kernel, it's a lookup, and it's about to find you a mcg in a red-back tree. slay 💅

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🌸 NAME 🌸

rxe_lookup_mcg — literally just looking up mcg in a red-back tree. no cap, that's it. that's the function. 🎀

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🦋 SYNOPSIS 🦋

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

so it takes the device and the gid, and hands you back a pointer to struct rxe_mcg. the way that signature is giving "I know what I'm doing" energy 😭🫶

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👑 ARGUMENTS 👑

• rxe — the rxe device object ✨ like, the whole device you're snooping around in
• mgid — multicast IP address 🌈 the thing you're trying to find, iykyk

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⭐ RETURN ⭐

if it finds it, you get the mcg. if it does not find it... you get NULL. that's the whole story bestie, no plot twist 💀🫶

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🧚 SEE ALSO 🧚

the kernel file is ./drivers/infiniband/sw/rxe/rxe_mcast.c and honestly the whole mcast friend group is here — go say hi to all of them 👑:

• rxe_mcast_add(9)
• rxe_mcast_del(9)
• __rxe_insert_mcg(9)
• __rxe_remove_mcg(9)
• __rxe_lookup_mcg(9)
• __rxe_init_mcg(9)
• __rxe_publish_mcg(9)
• rxe_get_mcg(9)
• rxe_cleanup_mcg(9)
• __rxe_destroy_mcg(9)
• rxe_destroy_mcg(9)
• __rxe_init_mca(9)
• rxe_attach_mcg(9)
• __rxe_cleanup_mca(9)
• rxe_detach_mcg(9)
• rxe_attach_mcast(9)
• rxe_detach_mcast(9)

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and that's the page, bestie 🎀 it's from ./drivers/infiniband/sw/rxe, dated October 2026, and the whole thing is filed under rxe_lookup_mcg(9) — go forth and look up your mcgs, you iconic main character 🔥💜