UNION NPS_PKT_SLC_CTL(9)

💅 union nps_pkt_slc_ctl — Solicited Packet Out Control Registers 🎀

okay bestie, welcome to the Kernel API Manual corner of the group chat ✨ this one is a page about union nps_pkt_slc_ctl, and the whole vibe is "control register, but make it a union." iconic honestly.

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🌸 NAME 🌸

union nps_pkt_slc_ctl — Solicited Packet Out Control Registers</p> 💖

like, that's the entire name section. short, sweet, slays, leaves.

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✨ SYNOPSIS ✨

bestie. deep breath. here's the whole struct, copied exactly, no notes, no edits, no "fixing" the semicolons on the preprocessor lines — they're there in the original and they stay 🫶

union nps_pkt_slc_ctl {
    u64 value;
    struct {
  #if defined(__BIG_ENDIAN_BITFIELD);
      u64 raz : 61;
      u64 rh : 1;
      u64 z : 1;
      u64 enb : 1;
  #else;
      u64 enb : 1;
      u64 z : 1;
      u64 rh : 1;
      u64 raz : 61;
  #endif;
    } s;
 };

the way this works is genuinely so satisfying: you can poke the register as one whole u64 value, or through s as individual bitfields — and the field order flips depending on whether __BIG_ENDIAN_BITFIELD is defined. enb gets to be the last field in big-endian and the first field otherwise. main character energy, honestly 💅

the fields you'll meet:

• value — the full 64-bit view of the register 🔥
• raz — a 61-bit field, exactly as spelled
• rh — 1 bit
• z — 1 bit
• enb — 1 bit, and yes it's the one that moves around in the #if

heads up: this page doesn't give field-level write-ups beyond the struct itself, so don't @ me for the lore — it's just not in here 🙈

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👑 Members 👑

the section is literally called Members and it's… empty. not a single member documented below it. it's giving "showed up to the party and said nothing" 💀 anyway, that's the section, it exists, we respect it.

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🦋 SEE ALSO 🦋

a whole squad of unions, no cap — all listed exactly as they appear:

• 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_cnts(9)
• union nps_pkt_slc_int_levels(9)
• union nps_pkt_in_done_cnts(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)

the kernel file these live in: ./drivers/crypto/cavium/nitrox/nitrox_csr.h — yes, the nitrox csr header, go read it, it's a whole mood 🌈

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🧚 sign-off 🧚

official footer vibes: this page comes from ./drivers/crypto/cavium/nitrox, dated October 2026, and the page itself is union nps_pkt_slc_ctl(9). that's the whole citation, copied with love, and yes I'm obsessed with it 🎀💜

periodt. go read the bitfields. 💖