STRUCT MXL862XX_PMAPPER(9)

💅 struct mxl862xx_pmapper(9) — P-mapper Configuration

okay so this is a page from the Kernel API Manual, bestie, and it's all about struct mxl862xx_pmapper — the P-mapper config situation. yes it's as niche as it sounds and yes it still slays ✨

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🌸 NAME 🌸

struct mxl862xx_pmapper — P-mapper Configuration. that's the whole vibe. it's a config struct, it holds mapping info, and honestly it's doing its job flawlessly 💖

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🎀 SYNOPSIS 🎀

here's the shape of it. exact, no cap:

struct mxl862xx_pmapper {
    __le16 pmapper_id;
    u8 dest_sub_if_id_group[73];
 };

that's it. two members. one of them is a 73-entry array and we'll get to why that's iconic in a sec 🦋

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✨ Members ✨

• pmapper_id — the index of the P-mapper. it lives in the range 0-31, so like... 32 of these bad boys max. pick your fave 👑
• dest_sub_if_id_group — the sub interface ID group 🫶 and the layout is very particular, so listen up:
  • entry 0 is for non-IP and non-VLAN tagged packets. the ✨no-frills✨ slot.
  • entries 1-8 are the PCP mapping entries, for VLAN tagged packets.
  • entries 9-72 are the DSCP or LAG mapping entries.

that's the full 73, bestie. 1 + 8 + 64. the math is mathing 💅

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💜 Description 💜

so what's it actually for? it's used by CTP port config and bridge port config. two callers, one struct, main character energy tbh 🔥

here's the tea on the important bit though, and this is a real caveat so don't skip it:

In the case of LAG, it is user's responsibility to provide the mapped entries in the given P-mapper table. nobody's doing it for you, bestie — you hand over the entries yourself 🙈

in the other modes, the entries are auto mapped from the input packet. the kernel handles it, you just vibe ⭐

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🌈 SEE ALSO 🌈

everything's chillin' in the kernel file ./drivers/net/dsa/mxl862xx/mxl862xx-api.h. go read the neighbours, they're all linked up:

• struct mdio_relay_data(9)
• struct mxl862xx_register_mod(9)
• enum mxl862xx_mac_table_filter(9)
• struct mxl862xx_mac_table_add(9)
• struct mxl862xx_mac_table_remove(9)
• struct mxl862xx_mac_table_read(9)
• struct mxl862xx_mac_table_query(9)
• enum mxl862xx_mac_clear_type(9)
• struct mxl862xx_mac_table_clear(9)
• enum mxl862xx_age_timer(9)
• struct mxl862xx_bridge_alloc(9)
• enum mxl862xx_bridge_config_mask(9)
• enum mxl862xx_bridge_port_egress_meter(9)
• struct mxl862xx_qos_meter_cfg(9)
• enum mxl862xx_bridge_forward_mode(9)
• struct mxl862xx_bridge_config(9)
• struct mxl862xx_bridge_port_alloc(9)
• enum mxl862xx_bridge_port_config_mask(9)
• enum mxl862xx_color_marking_mode(9)
• enum mxl862xx_color_remarking_mode(9)
• enum mxl862xx_pmapper_mapping_mode(9)
• struct mxl862xx_bridge_port_config(9)
• struct mxl862xx_cfg(9)
• enum mxl862xx_extended_vlan_filter_type(9)
• enum mxl862xx_extended_vlan_filter_tpid(9)
• enum mxl862xx_extended_vlan_filter_dei(9)
• enum mxl862xx_extended_vlan_treatment_remove_tag(9)
• enum mxl862xx_extended_vlan_treatment_priority(9)
• enum mxl862xx_extended_vlan_treatment_vid(9)
• enum mxl862xx_extended_vlan_treatment_tpid(9)
• enum mxl862xx_extended_vlan_treatment_dei(9)
• enum mxl862xx_extended_vlan_4_tpid_mode(9)
• enum mxl862xx_extended_vlan_filter_ethertype(9)
• struct mxl862xx_extendedvlan_filter_vlan(9)
• struct mxl862xx_extendedvlan_filter(9)
• struct mxl862xx_extendedvlan_treatment_vlan(9)
• struct mxl862xx_extendedvlan_treatment(9)
• struct mxl862xx_extendedvlan_alloc(9)
• struct mxl862xx_extendedvlan_config(9)
• enum mxl862xx_vlan_filter_tci_mask(9)
• struct mxl862xx_vlanfilter_alloc(9)
• struct mxl862xx_vlanfilter_config(9)
• enum mxl862xx_ss_sp_tag_mask(9)
• enum mxl862xx_ss_sp_tag_rx(9)
• enum mxl862xx_ss_sp_tag_tx(9)
• enum mxl862xx_ss_sp_tag_rx_pen(9)
• struct mxl862xx_ss_sp_tag(9)
• enum mxl862xx_logical_port_mode(9)
• struct mxl862xx_ctp_port_assignment(9)
• enum mxl862xx_stp_port_state(9)
• struct mxl862xx_stp_port_cfg(9)
• struct mxl862xx_sys_fw_image_version(9)
• enum mxl862xx_port_type(9)
• enum mxl862xx_rmon_port_type(9)
• struct mxl862xx_rmon_port_cnt(9)
• union mxl862xx_xpcs_an_word(9)
• enum mxl862xx_xpcs_loopback_mode(9)
• struct mxl862xx_xpcs_pcs_cfg(9)
• struct mxl862xx_xpcs_pcs_state(9)
• struct mxl862xx_xpcs_pcs_disable(9)
• struct mxl862xx_xpcs_an_restart(9)
• struct mxl862xx_xpcs_pcs_link_up(9)

like, that's the whole friend group. go say hi 🧚

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and that's the page!! mwah 💋 this lil manual lives over in ./drivers/net/dsa/mxl862xx and it's dated October 2026 — so yeah, it's from the future and it still ate. bye bestie, go map some packets 🍓💅