efx_filter_set_ipv4_local(9)

💖 efx_filter_set_ipv4_local(9) 💖

okay so bestie, we're in the Kernel API Manual today and this page is literally about one tiny little helper that sets up an IPv4 filter for you 🥰 it's from the sfc/siena ethernet driver corner of the kernel, and ngl it's giving "small function, big job" energy. buckle up 🎀

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✨ NAME ✨

efx_filter_set_ipv4_local — specify IPv4 host, transport protocol and port

like, that's the whole elevator pitch 💅 you tell it a host + proto + port and it goes "got it, filter time" ✨

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🌸 SYNOPSIS 🌸

int efx_filter_set_ipv4_local (struct efx_filter_spec *spec , u8 proto ,
       __be32 host , __be16 port );

that return type is int btw — she returns a value, she's not void, she has main character energy 👑

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🦋 ARGUMENTS 🦋

• spec — the Specification to initialise 💖 like, this is the blank canvas bestie, you hand it over and she fills it in
• proto — Transport layer protocol number 🌈 (that's the "which protocol is this even" number)
• host — Local host address, in network byte order ⭐ do not come in here with host byte order, I'm begging 😭
• port — Local port, also in network byte order 🫶 same deal, same rule, iykyk

fr fr, both host and port want network byte order. don't be the person who forgets 💀

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👑 SEE ALSO 👑

Kernel file ./drivers/net/ethernet/sfc/siena/filter.h — that's the bestie's home address 🏠 and then the whole friend group:

• enum efx_filter_match_flags(9)
• enum efx_filter_priority(9)
• enum efx_filter_flags(9)
• struct efx_filter_spec(9)
• efx_filter_set_ipv4_full(9)
• efx_filter_set_eth_local(9)
• efx_filter_set_uc_def(9)
• efx_filter_set_mc_def(9)

go read those too, they're iconic, no cap 🌟

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mwah 💋 that's the whole page. this lil beauty lives over in ./drivers/net/ethernet/sfc/siena, dated October 2026, and yes she's still signed efx_filter_set_ipv4_local(9) because legends never change their name 💜✨