ice_calc_gtpu_ctx_idx(9)

💅 ice_calc_gtpu_ctx_idx 💅

okay so bestie, welcome to the Kernel API Manual section 9, and today's main character is ice_calc_gtpu_ctx_idx ✨

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✨ NAME ✨

ice_calc_gtpu_ctx_idx — no cap, this one just calculates the GTPU hash context index 🎀

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🦋 SYNOPSIS 🦋

enum ice_hash_gtpu_ctx_type ice_calc_gtpu_ctx_idx (u32 hdrs );

like, that's the whole vibe. one arg. one return type. slay 💅

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🌸 ARGUMENTS 🌸

• hdrs — a bitmask of protocol headers prefixed with ICE_FLOW_SEG_HDR_* 🫶 (yes bestie, it's a bitmask, so it's giving "several things turned on at once" energy)

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💖 DESCRIPTION 💖

so what this function actually does is determine the GTPU hash context index based on the combination of encapsulation headers — that's GTPU_EH, GTPU_UP, and GTPU_DWN — and the transport protocols (UDP, TCP) sitting inside IPv4 or IPv6 flows 🌈

literally it's just looking at which headers you stacked up and going "okay, which context index does this combo belong to" 🔥

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👑 RETURN 👑

• A valid context index (0-8) if the header combination is supported 🎉
• Or ICE_HASH_GTPU_CTX_MAX if the combination is invalid 💀 (yeah, that's the "nope, not a vibe" answer)

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⭐ SEE ALSO ⭐

the friend group 😭 — all of these are in the kernel file ./drivers/net/ethernet/intel/ice/virt/rss.c:

• 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_map_ip_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)

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ok that's the whole page 🫶 go forth and index your GTPU contexts, bestie. periodt. 💜

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sign-off time 🧚 — this lil masterpiece lives in ./drivers/net/ethernet/intel/i... (yes, the path got cut off in the footer, don't @ me 😭) and it's dated October 2026. mwah 💋