rvt_attach_mcast(9)

💖 rvt_attach_mcast(9) — like, the Kernel API Manual era, bestie 🎀

okay so real talk: this whole page lives in section 9 of the Kernel API Manual, and it's about rvt_attach_mcast — literally the function that hooks your queue pair up to a multicast group. it's giving "let me introduce you to the group chat" energy, but for InfiniBand. no cap. 🌸

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✨ NAME ✨

rvt_attach_mcast — attach a qp to a multicast group 💅

like... yes, that's literally it. qp meets multicast group, they become a thing. iconic behavior honestly. 🦋

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🌈 SYNOPSIS 🌈

int rvt_attach_mcast (struct ib_qp *ibqp , union ib_gid *gid , u16 lid
);

three args, one int coming back at you. she's simple, she's elegant, she ate. 🔥

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🎀 ARGUMENTS 🎀

• ibqp — the Infiniband qp 🫶 like, the queue pair in question, your main character
• gid — multicast guid ⭐ the group's identifier, iykyk
• lid — multicast lid 💜 the lid for the multicast, right there in the arg list

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👑 RETURN 👑

0 on success ✨ that's it, that's the whole vibe check. zero means we slayed.

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🧚 SEE ALSO 🧚

so if you wanna keep reading (and you should, bestie, the lore is deep):

• Kernel file ./drivers/infiniband/sw/rdmavt/mcast.c 📁 — the source, go peek
• rvt_driver_mcast_init(9) 🌱
• rvt_mcast_qp_alloc(9) 🍓
• rvt_mcast_alloc(9) 💫
• rvt_mcast_find(9) 🔍
• rvt_detach_mcast(9) 💔 (the breakup counterpart, we love her)
• rvt_mcast_tree_empty(9) 🌳

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ok but seriously bestie, click through those SEE ALSOs — that's where the whole multicast tree situation gets explained and it's lowkey fascinating. 😭

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and that's the page!! came straight out of ./drivers/infiniband/sw/rdmavt, dated October 2026, and it's rvt_attach_mcast(9) if you need to cite her. mwah 💋✨ go attach something to a multicast group, you got this 🫶🌸