ice_map_ip_ctx_idx(9)

💅 ice_map_ip_ctx_idx(9) — like, the Kernel API Manual page your bestie actually wants to read

okay so bestie, welcome to ice_map_ip_ctx_idx(9) from the Kernel API Manual ✨ this one is a tiny lil function but she's important, so grab your iced coffee and let's go 🍓

---

✨ NAME ✨

ice_map_ip_ctx_idx — bestie, this maps the index of the IP L4 hash context 💅 that's literally the whole vibe.

---

🦋 SYNOPSIS 🦋

u8 ice_map_ip_ctx_idx (u32 hdrs );

like, she takes one thing and gives you back a u8. simple. iconic. no cap 🫶

---

🎀 ARGUMENTS 🎀

• hdrs — this is the protocol headers prefix, and it's carrying ICE_FLOW_SEG_HDR_XXX values with it. yes, exactly those ones, don't swap 'em out 🙈

---

🌸 DESCRIPTION 🌸

so here's the tea ☕ — the IP L4 hash context uses the index to classify for IPv4/IPv6 with ESP/UDP_ESP/AH/PFCP, plus the non-tunnel UDP/TCP/SCTP crew 💖 and what this function does is map that index based on the protocol headers. like it looks at the headers you handed it and goes "okay so this one" ✨

that's it, that's the whole job. main character energy honestly 👑

---

🔥 RETURN 🔥

• the mapped IP context index on success 🎉 slay
• or ICE_HASH_IP_CTX_MAX if no matching context is found 😭 like, nothing matched, that's the "no thoughts head empty" outcome, and yes you have to actually check for it, don't just assume success bestie 💀

---

🧚 SEE ALSO 🧚

• Kernel file ./drivers/net/ethernet/intel/ice/virt/rss.c — go read her, she's the source of truth 📖
• ice_vc_validate_pattern(9)
• ice_vc_parse_rss_cfg(9)
• ice_vf_adv_rss_offload_ena(9)
• ice_is_hash_cfg_valid(9)
• ice_hash_cfg_reset(9)
• ice_hash_cfg_record(9)
• ice_hash_moveout(9)
• ice_hash_moveback(9)
• ice_hash_remove(9)
• ice_add_rss_cfg_pre_gtpu(9)
• ice_add_rss_cfg_pre_ip(9)
• ice_calc_gtpu_ctx_idx(9)
• ice_add_rss_cfg_pre(9)
• ice_add_rss_cfg_post_gtpu(9)
• ice_rem_rss_cfg_post(9)
• ice_rem_rss_cfg_wrap(9)
• ice_add_rss_cfg_wrap(9)
• ice_parse_raw_rss_pattern(9)
• ice_add_raw_rss_cfg(9)
• ice_rem_raw_rss_cfg(9)
• ice_vc_handle_rss_cfg(9)
• ice_vc_config_rss_key(9)
• ice_vc_config_rss_lut(9)
• ice_vc_config_rss_hfunc(9)
• ice_vc_get_rss_hashcfg(9)
• ice_vc_set_rss_hashcfg(9)

like yes that's a lot of friends but they're all in the same group chat, iykyk 💜

---

ngl, if you're ever lost, just come back to ICE_HASH_IP_CTX_MAX and remember: no match ≠ success 🙏

---

okay and the cute lil sign-off 💌 this page lives at ./drivers/net/ethernet/intel/i... (yes it's truncated in the original, she's mysterious like that 🦋), dated October 2026, and it's ice_map_ip_ctx_idx(9) forever and always. mwah 💋 periodt ✨🌈