UNION NPS_PKT_IN_DONE_CNTS(9)

🌸 union nps_pkt_in_done_cnts(9) 🌸

okay so this is a page from the Kernel API Manual — yes, the Kernel API Manual, we're in the big leagues bestie 💅 — and it's all about union nps_pkt_in_done_cnts, aka the Input instruction ring counts registers. (the heading already told you the name, so like… now you know, and knowing is half the battle ✨)

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🦋 NAME 🦋

union nps_pkt_in_done_cnts — Input instruction ring counts registers. that's it, that's the whole name section, she's brief and she's iconic 🎀

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✨ SYNOPSIS ✨

union nps_pkt_in_done_cnts {
    u64 value;
    struct {
  #if defined(__BIG_ENDIAN_BITFIELD);
      u64 slc_int : 1;
      u64 uns_int : 1;
      u64 in_int : 1;
      u64 mbox_int : 1;
      u64 resend : 1;
      u64 raz : 27;
      u64 cnt : 32;
  #else;
      u64 cnt : 32;
      u64 raz : 27;
      u64 resend : 1;
      u64 mbox_int : 1;
      u64 in_int : 1;
      u64 uns_int : 1;
      u64 slc_int : 1;
  #endif;
    } s;
 };

so real talk: you got u64 value; doing the whole-union thing, and then a struct s that's literally the same bits read two different ways depending on __BIG_ENDIAN_BITFIELD 👀 — big endian goes top-to-bottom, little endian (the #else; branch) flips the entire order, cnt first and slc_int last. it's giving mirrored queen energy 🪞💖

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🌈 DESCRIPTION 🌈

okay so lowkey this page is a union in the C sense — one u64 named value, and a bitfield struct named s layered right on top of it, so you can grab the whole 64-bit word or poke at individual fields. and because bitfields are a whole thing, the layout depends on __BIG_ENDIAN_BITFIELD:

• big endian branch (#if defined(__BIG_ENDIAN_BITFIELD);) — order is slc_int, uns_int, in_int, mbox_int, resend, raz, cnt
• little endian branch (#else;) — order is cnt, raz, resend, mbox_int, in_int, uns_int, slc_int

either way the widths add up to a whole u64: five 1-bit flags, a 27-bit raz, and a 32-bit cnt — 1+1+1+1+1+27+32 = 64, the math ate and left no crumbs 🔥

heads up bestie: you do not get to pick the layout, the preprocessor picks it for you based on __BIG_ENDIAN_BITFIELD. so like… know which one you're compiling for, mkay? 💀

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🎀 Members 🎀

ngl the source page leaves this section literally empty — not a single line under it 😭 so I'm not gonna invent stuff that isn't there. the members are exactly what the synopsis bitfields say and nothing more:

• value — u64, the whole thing in one go 👑
• s — the struct with the bitfields, laid out per __BIG_ENDIAN_BITFIELD
  • slc_int — : 1
  • uns_int — : 1
  • in_int — : 1
  • mbox_int — : 1
  • resend — : 1
  • raz — : 27
  • cnt — : 32

(and remember, in the #else; branch that list runs in reverse — cnt, raz, resend, mbox_int, in_int, uns_int, slc_int 🦋)

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💜 SEE ALSO 💜

girl, the cross-reference list on this one is long, and we respect her for it. the kernel file lives at ./drivers/crypto/cavium/nitrox/nitrox_csr.h, and here's the entire friend group, no cap, all (9):

• union ucd_core_eid_ucode_block_num(9)
• union aqm_grp_execmsk_lo(9)
• union aqm_grp_execmsk_hi(9)
• union aqmq_drbl(9)
• union aqmq_qsz(9)
• union aqmq_cmp_thr(9)
• union aqmq_cmp_cnt(9)
• union aqmq_en(9)
• union aqmq_activity_stat(9)
• union emu_fuse_map(9)
• union emu_se_enable(9)
• union emu_ae_enable(9)
• union emu_wd_int_ena_w1s(9)
• union emu_ge_int_ena_w1s(9)
• union nps_pkt_slc_ctl(9)
• union nps_pkt_slc_cnts(9)
• union nps_pkt_slc_int_levels(9)
• union nps_pkt_in_instr_ctl(9)
• union nps_pkt_in_instr_rsize(9)
• union nps_pkt_in_instr_baoff_dbell(9)
• union nps_core_int_ena_w1s(9)
• union nps_core_gbl_vfcfg(9)
• union nps_core_int_active(9)
• union efl_core_int(9)
• union efl_core_int_ena_w1s(9)
• union efl_rnm_ctl_status(9)
• union bmi_ctl(9)
• union bmi_int_ena_w1s(9)
• union bmo_ctl2(9)
• union pom_int_ena_w1s(9)
• union lbc_inval_ctl(9)
• union lbc_int_ena_w1s(9)
• union lbc_int(9)
• union lbc_inval_status(9)
• union rst_boot(9)
• union fus_dat1(9)

like I said. long. but she ate 💅

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and that's the page!! mwah 🫶 ok bye, and remember the sign-off, because the original footer said this gem lives under ./drivers/crypto/cavium/nitrox, dated October 2026, on union nps_pkt_in_done_cnts(9) — periodt, no cap, go read your kernel headers bestie 🍓✨🧚