idpf_get_rxfh(9)

💅 idpf_get_rxfh — your girl's guide to the rx flow hash indirection table 🎀

okay so real talk: this one's from the Kernel API Manual, section 9 (idpf_get_rxfh(9)), and it's lowkey iconic if you're into RSS. stay with me bestie, it's actually cute ✨

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🌸 SYNOPSIS 🌸

int idpf_get_rxfh (struct net_device *netdev , struct ethtool_rxfh_param
*rxfh );

that's the whole vibe. two args, one int back. slay. 🫶

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🦋 ARGUMENTS 🦋

• netdev — the network interface device structure. yes bestie, the actual NIC we're talking about, the main character 👑
• rxfh — a pointer to the param struct — and that struct is packing indir, key, and hfunc 😌

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✨ DESCRIPTION ✨

so here's the tea: the RSS LUT and the Key info? they don't get freshly yanked from the hardware — nope. they're read straight out of the driver's cached copy. cached! efficient! obsessed. 💖

but here's the little plot twist 🌈 — when rxhash is off, the rss lut will be displayed as zeros. not a bug, just how it is, fr fr. zeros. all of them. 💀

ngl this is the kind of detail you wanna remember before you're like "bestie why is my LUT empty" 🙈

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⭐ RETURN ⭐

• 0 on success 🎉
• -errno otherwise 😭

that's it. that's the return. short, sweet, no cap.

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💜 SEE ALSO 💜

alright buckle up, this list is LONG and honestly? it ate. 🔥

• Kernel file: ./drivers/net/ethernet/intel/idpf/idpf_ethtool.c

and the whole friend group:

• 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_set_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, forty-plus entries, and every single one matters 💅

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and that's the whole page, bestie 🌸✨

cute little sign-off for the record: this one lives in the Linux kernel source at ./drivers/net/ethernet/intel/idpf, dated October 2026, and you're reading idpf_get_rxfh(9). periodt. 💖🎀🧚