rxe_attach_mcg(9)

✨ NAME ✨

okay so bestie, welcome to the rxe_attach_mcg(9) page from the Kernel API Manual 💅 this is the function that attaches a qp to a mcg — but only if it’s not already attached. It’s giving “add them to the group chat, but don’t double-add, bestie.” 🫶

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🎀 SYNOPSIS 🎀

the whole signature is right here, copy it exactly, no autocorrect energy:

int rxe_attach_mcg (struct rxe_mcg *mcg , struct rxe_qp *qp );

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🦋 ARGUMENTS 🦋

• mcg — the mcg object, literally. That’s the vibe.
• qp — the qp object. Yep, that one. 🎀

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🫶 CONTEXT 🫶

Vibe check before you call this: the caller must hold reference on qp and mcg. Both of them. No cap. 💀

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💖 RETURN 💖

It returns 0 on success, else an error. That’s it, periodt. ✨

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/infiniband/sw/rxe/rxe_mcast.c

The whole squad is rxe_mcast_add(9), rxe_mcast_del(9), __rxe_insert_mcg(9), __rxe_remove_mcg(9), __rxe_lookup_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_cleanup_mca(9), rxe_detach_mcg(9), rxe_attach_mcast(9), rxe_detach_mcast(9).

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byeee bestie 💅 this page’s source/version is ./drivers/infiniband/sw/rxe and its date is October 2026. slay. 🎀