STRUCT IDPF_SW_QUEUE(9)

🌸 struct idpf_sw_queue(9) — the kernel API manual, bestie edition 🌸

okay so this page is from the Kernel API Manual, and it's literally all about struct idpf_sw_queue 💅 — the software queue. The NAME line in the original is just the struct name and a lil' dash with nothing after it, so no spoilers there. The real tea is below 👇

---

✨ SYNOPSIS ✨

Here's the whole struct, copied exactly, no cap:

struct idpf_sw_queue {
    __cacheline_group_begin_aligned(read_mostly);
    u32 *ring;
    unsigned long flags[BITS_TO_LONGS( __IDPF_Q_FLAGS_NBITS)];
    u32 desc_count;
    __cacheline_group_end_aligned(read_mostly);
    __cacheline_group_begin_aligned(read_write);
    u32 next_to_use;
    u32 next_to_clean;
    __cacheline_group_end_aligned(read_write);
 };

notice the cacheline group markers? that's the struct being organized into a read_mostly chunk and a read_write chunk 🎀 iconic behavior honestly.

---

🫶 Members 🫶

the glow-up tour of every field:

• ring — pointer to the ring 💫
• flags — see enum idpf_queue_flags_t (that's where the flag meanings live, iykyk)
• desc_count — the descriptor count, aka how many descriptors we're working with
• next_to_use — the buffer to allocate at
• next_to_clean — the next descriptor to clean 🧹

---

💖 Description 💖

so here's the vibe: these software queues get used in splitq mode to manage buffers between the rxq producer and the bufq consumer. That's the whole point of them, fr fr.

they exist so we can keep a lockless buffer management system running 😭 and — key detail — they are strictly software only constructs. like, purely a software thing, no hardware involved. periodt.

---

🔥 SEE ALSO 🔥

go read these next, bestie, they're all in the kernel file ./drivers/net/ethernet/intel/idpf/idpf_txrx.h:

• struct idpf_tx_offload_params(9)
• struct idpf_tx_splitq_params(9)
• enum idpf_queue_flags_t(9)
• struct idpf_vec_regs(9)
• struct idpf_intr_reg(9)
• struct idpf_q_vector(9)
• struct idpf_rx_queue(9)
• struct idpf_tx_queue(9)
• struct idpf_buf_queue(9)
• struct idpf_compl_queue(9)
• struct idpf_rxq_set(9)
• struct idpf_bufq_set(9)
• struct idpf_rxq_group(9)
• struct idpf_txq_group(9)
• idpf_size_to_txd_count(9)
• idpf_tx_singleq_build_ctob(9)
• idpf_tx_splitq_build_desc(9)
• idpf_vport_intr_set_wb_on_itr(9)
• idpf_tx_splitq_get_free_bufs(9)

---

💀 real talk: this page is about a struct, so there's no exit statuses, no signals, no env vars, no error codes up in here. it's a data structure. that's it. that's the post. 🦋

---

k bye bestie, this page lives in ./drivers/net/ethernet/intel/idpf and it's stamped October 2026 — mwah, drink water, go read your manpages 💜🎀✨