rvt_mcast_alloc(9)

💅 rvt_mcast_alloc(9) — the kernel API manual, but make it make sense 🎀

okay so bestie, welcome to the rvt_mcast_alloc page from the Kernel API Manual — yes it's a section 9 page, yes that means kernel internals, no you don't have to be scared, i got you 🫶

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✨ NAME ✨

rvt_mcast_alloc — allocate the multicast GID structure. that's it, that's the whole job. she's a one-line icon 👑

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🌸 SYNOPSIS 🌸

struct rvt_mcast * rvt_mcast_alloc (union ib_gid *mgid , u16 lid );

literally the whole signature, copied exactly, no cap 💅

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🦋 ARGUMENTS 🦋

• mgid — the multicast GID. this is the what of the whole situation.
• lid — the multicast LID, in host order (so no, don't go byte-swapping it, it's already correct, ngl that's the vibe check people fail the most 🙈).

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💖 DESCRIPTION 💖

a list of QPs is gonna get attached to this structure. like, this struct is literally the main character and the QPs are her group chat — they all get attached to her ✨ periodt.

that's the whole description fr fr. it's a short page, she's lowkey mysterious, we respect that 🎀

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🔥 SEE ALSO 🔥

• the kernel file ./drivers/infiniband/sw/rdmavt/mcast.c — go read the source bestie, it's giving transparency 🌈
• rvt_driver_mcast_init(9)
• rvt_mcast_qp_alloc(9)
• rvt_mcast_find(9)
• rvt_attach_mcast(9)
• rvt_detach_mcast(9)
• rvt_mcast_tree_empty(9)

that's the whole friend group, they all show up together, obsessed 💜

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— and that's the page!! 🦋 sign-off time: this one lives in ./drivers/infiniband/sw/rdmavt, dated October 2026, and yes the footer still says rvt_mcast_alloc(9) because we keep the receipts ⭐ 💅