idpf_set_rxfh(9)

💅 idpf_set_rxfh — it's giving "set the rx flow hash indirection table"

okay so bestie, we're in the Kernel API Manual today (yes, the idpf_set_rxfh(9) one, keep up 💖) and this is genuinely one of those little functions that does exactly one thing and does it iconically. no notes.

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✨ SYNOPSIS ✨

int idpf_set_rxfh (struct net_device *netdev , struct ethtool_rxfh_param
*rxfh , struct netlink_ext_ack *extack );

like… look at her. three args, returns an int. main character energy fr fr 🔥

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🎀 ARGUMENTS 🎀

• netdev — the network interface device structure 🫶 that's your actual NIC bestie, the thing we're doing the whole operation on.
• rxfh — pointer to the param struct (indir, key, hfunc) ✨ so it's carrying the indirection table, the hash key, and the hash function all together. very "everything bagel" of it.
• extack — the extended ACK from the Netlink message 💌 that's the little receipt/feedback channel so the caller can find out what went wrong.

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💜 DESCRIPTION 💜

So here's the whole vibe: it returns -EINVAL if the table specifies an invalid queue id 🙈 — like, if the indirection table points at a queue that doesn't exist, we're not doing that, absolutely not, take your -EINVAL and go.

Otherwise? Returns 0 after programming the table. 🎉 That's it. That's the function. It programs the table, it says "slay, done," it returns 0. Clean, simple, no drama, periodt.

ngl the willingness to hard-reject a bad queue id is so valid of her. boundaries. we love to see it. 💅

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🦋 SEE ALSO 🦋

okay this is the part where I hold your hand because the friend group here is large. Sit down. Hydrate. 🍓

First up, the kernel file herself: ./drivers/net/ethernet/intel/idpf/idpf_ethtool.c — the source of truth, the origin story, iykyk.

And then the whole extended fam:

idpf_get_rx_ring_count(9), idpf_get_rxnfc(9), idpf_add_flow_steer(9), idpf_del_flow_steer(9), idpf_get_rxfh_key_size(9), idpf_get_rxfh_indir_size(9), idpf_get_rxfh(9), idpf_get_channels(9), idpf_set_channels(9), idpf_get_ringparam(9), idpf_set_ringparam(9), struct idpf_stats(9), __idpf_add_qstat_strings(9), idpf_add_qstat_strings(9), idpf_add_stat_strings(9), idpf_get_stat_strings(9), idpf_get_strings(9), idpf_get_sset_count(9), idpf_add_one_ethtool_stat(9), idpf_add_queue_stats(9), idpf_add_empty_queue_stats(9), idpf_add_port_stats(9), idpf_collect_queue_stats(9), idpf_get_ethtool_stats(9), idpf_find_rxq_vec(9), idpf_find_txq_vec(9), __idpf_get_q_coalesce(9), idpf_get_q_coalesce(9), idpf_get_coalesce(9), idpf_get_per_q_coalesce(9), __idpf_set_q_coalesce(9), idpf_set_q_coalesce(9), idpf_set_coalesce(9), idpf_set_per_q_coalesce(9), idpf_get_msglevel(9), idpf_set_msglevel(9), idpf_get_link_ksettings(9), idpf_get_timestamp_filters(9), idpf_get_ts_info(9), idpf_get_ts_stats(9), idpf_set_ethtool_ops(9)

like… that's the whole roster. the whole group chat. every single one is in the list, go say hi, they're all lovely 💖

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🌈 that's the page, bestie! this one's from ./drivers/net/ethernet/intel/idpf (the source/version vibe), dated October 2026, and the header/footer name is idpf_set_rxfh(9) — the manual name is "Kernel API Manual", if you were wondering. mwah 💋 go program a table. ✨