STRUCT XSDFEC_LDPC_PARAMS(9)

💅 NAME

struct xsdfec_ldpc_params — the user data for LDPC codes, bestie. That's it, that's the vibe ✨

(it's from the Kernel API Manual, section 9, and it's the struct that carries your LDPC params from your app into the driver 🫶)

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🦋 SYNOPSIS

struct xsdfec_ldpc_params {
    __u32 n;
    __u32 k;
    __u32 psize;
    __u32 nlayers;
    __u32 nqc;
    __u32 nmqc;
    __u32 nm;
    __u32 norm_type;
    __u32 no_packing;
    __u32 special_qc;
    __u32 no_final_parity;
    __u32 max_schedule;
    __u32 sc_off;
    __u32 la_off;
    __u32 qc_off;
    __u32 *sc_table;
    __u32 *la_table;
    __u32 *qc_table;
    __u16 code_id;
};

okay so literally nineteen fields, one struct, no cap — let's meet the cast 💖

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🎀 Members

• n — the number of code word bits 🧚
• k — the number of information bits ⭐
• psize — the size of the sub-matrix 🌸
• nlayers — how many layers are in the code 🌈
• nqc — the Quasi Cyclic Number 👑
• nmqc — the number of M-sized QC operations in the parity check matrix 💫
• nm — the number of M-size vectors in N 🍓
• norm_type — says whether normalization is required or not ⚖️
• no_packing — determines if multiple QC ops should be performed 🙈
• special_qc — the sub-matrix property for circulant weight > 0 💅
• no_final_parity — decides if the final parity check needs to be performed 🔍
• max_schedule — an experimental code word scheduling limit (yes, experimental, we love a lil chaos 😭)
• sc_off — the SC offset 🎯
• la_off — the LA offset 🎯
• qc_off — the QC offset 🎯
• sc_table — pointer to the SC Table, and it must be page aligned ⚠️
• la_table — pointer to the LA Table, and it must be page aligned ⚠️
• qc_table — pointer to the QC Table, and it must be page aligned ⚠️
• code_id — the LDPC Code itself, the main character 🫶

bestie listen to me: all three of those table pointers must be page aligned. Not vibes-aligned, page aligned. Do not come crying to me later 💀

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✨ Description

This structure describes the LDPC code that gets passed to the driver by the application. That's the whole energy of it — the app writes it, the driver receives it, the LDPC code gets described. Iconic, honestly 🎀

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🔥 SEE ALSO

Kernel file ./include/uapi/misc/xilinx_sdfec.h, plus the whole friend group: enum xsdfec_code(9), enum xsdfec_order(9), enum xsdfec_turbo_alg(9), enum xsdfec_state(9), enum xsdfec_axis_width(9), enum xsdfec_axis_word_include(9), struct xsdfec_turbo(9), struct xsdfec_status(9), struct xsdfec_irq(9), struct xsdfec_config(9), struct xsdfec_stats(9), struct xsdfec_ldpc_param_table_sizes(9), XSDFEC_START_DEV(9), XSDFEC_STOP_DEV(9), XSDFEC_GET_STATUS(9), XSDFEC_SET_IRQ(9), XSDFEC_SET_TURBO(9), XSDFEC_ADD_LDPC_CODE_PARAMS(9), XSDFEC_GET_CONFIG(9), XSDFEC_GET_TURBO(9), XSDFEC_SET_ORDER(9), XSDFEC_SET_BYPASS(9), XSDFEC_IS_ACTIVE(9), XSDFEC_CLEAR_STATS(9), XSDFEC_GET_STATS(9), XSDFEC_SET_DEFAULT_CONFIG(9) 🦋

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k that's the whole page, go be page-aligned and slay 💜 This one lives in ./include/uapi/misc, dated October 2026, and it's struct xsdfec_ldpc_params(9) — mwah, see u in the group chat 💅✨