rdma_find_gid_by_filter(9)

💖 rdma_find_gid_by_filter 💖

okay so bestie, welcome to the rdma_find_gid_by_filter(9) page from your Kernel API Manual — yes it's a kernel manpage and yes we're gonna make it cute, but nothing gets skipped, promise 🫶

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✨ NAME ✨

rdma_find_gid_by_filter — returns the GID table attribute where a specified GID value occurs, no cap 💅

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🌸 SYNOPSIS 🌸

const struct ib_gid_attr * rdma_find_gid_by_filter (struct ib_device
*ib_dev , const union ib_gid *gid , u32 port , bool (*filter)(const
union ib_gid *gid, const struct ib_gid_attr *, void *) , void *context
);

look at that signature. it's giving "function with a callback" and honestly it ate 🔥

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🎀 ARGUMENTS 🎀

• ib_dev — the device you're querying. like, the main character of the operation 👑
• gid — the GID value you're searching for. that's the whole point fr fr 🦋
• port — the port number of the device where the GID value could be searched 💫
• filter — okay so this filter function gets executed on any matching GID in the table. if the filter function returns true, the corresponding index is returned; otherwise, we just keep searching the GID table, lowkey persistent energy 🌈. it's guaranteed that while filter is executed, the ndev field is valid and the structure won't change — so you're safe, bestie ✨. but filter is executed in an atomic context, and filter must not be NULL. periodt 💀
• context — private data to pass into the call-back. a lil gift for your filter function 🎁

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💜 DESCRIPTION 💜

rdma_find_gid_by_filter searches for the specified GID value of which the filter function returns true in the port's GID table. that's it, that's the vibe check and it passed 🧚

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⭐ SEE ALSO ⭐

kernel file ./drivers/infiniband/core/cache.c and friends:

free_gid_work(9), del_gid(9), add_modify_gid(9), rdma_find_gid_by_port(9), rdma_query_gid(9), rdma_read_gid_hw_context(9), rdma_find_gid(9), rdma_get_gid_attr(9), rdma_query_gid_table(9), rdma_put_gid_attr(9), rdma_hold_gid_attr(9), rdma_read_gid_attr_ndev_rcu(9), rdma_read_gid_l2_fields(9), ib_dispatch_event(9)

go read those too, iykyk 📚💖

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ngl the filter callback constraint is the real one to remember: atomic context, ndev stays valid, and absolutely no NULL filters. bestie we don't do NULL here 🙈

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alright that's the whole page — sourced from ./drivers/infiniband/core, dated October 2026, and this lil rdma_find_gid_by_filter(9) era is officially over. slay, bye 🎀💅✨