STRUCT ADAPTER_REPLY_QUEUE(9)

💅 struct adapter_reply_queue(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for struct adapter_reply_queue — it's a big day for the mpt3sas girlies 🎀 this is literally the reply queue struct, and we're gonna go through it line by line, no skips, no cap.

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✨ NAME ✨

struct adapter_reply_queue — the reply queue struct. that's it, that's the tweet 🐦

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🌸 SYNOPSIS 🌸

struct adapter_reply_queue {
    struct MPT3SAS_ADAPTER  *ioc;
    u8 msix_index;
    u32 reply_post_host_index;
    Mpi2ReplyDescriptorsUnion_t *reply_post_free;
    char name[MPT_NAME_LENGTH];
    atomic_t busy;
    u32 os_irq;
    struct irq_poll         irqpoll;
    bool irq_poll_scheduled;
    bool irq_line_enable;
    bool is_iouring_poll_q;
    struct list_head        list;
 };

like, that's the whole struct, exactly as written, don't come for me about the indentation on that last }; — we keep it verbatim in this house 💯

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🦋 Members 🦋

so these are the members, one by one, in order, because we do not skip:

• ioc — the per adapter object 🫶 like, the whole adapter, just chilling in there
• msix_index — the msix index into the vector table
• reply_post_host_index — the head index in the pool where FW completes IO (FW = firmware, bestie, it's doing the actual IO completion thing)
• reply_post_free — the reply post base virt address
• name — the name registered to request_irq 🌈
• busy — an atomic_t telling you the isr is actively processing replies on another cpu 😭 so yeah, it's busy busy
• os_irq — the irq number
• irqpoll — the irq_poll object
• irq_poll_scheduled — tells whether irq poll is scheduled or not. a yes/no vibe check basically ✨
• is_iouring_poll_q — tells whether reply queues is assigned to io uring poll queues or not 👑 (writing it exactly how the page writes it, ngl)
• list — this list. iconic, no notes. it's the list. it lists. 💀

ngl the struct up top also declares irq_line_enable but the Members section doesn't say a single word about it 🙈 so we're not gonna invent lore. it's there, it's a bool, and the manpage is silent. respect the silence.

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🧚 SEE ALSO 🧚

the friend group, the whole cast, the extended universe — all in Kernel file ./drivers/scsi/mpt3sas/mpt3sas_base.h:

• struct MPT3SAS_TARGET(9)
• struct MPT3SAS_DEVICE(9)
• struct _internal_cmd(9)
• struct _sas_device(9)
• pcie_device_get(9)
• pcie_device_free(9)
• pcie_device_put(9)
• struct _boot_device(9)
• struct _sas_port(9)
• struct _sas_phy(9)
• struct _sas_node(9)
• struct _enclosure_node(9)
• enum reset_type(9)
• struct pcie_sg_list(9)
• struct chain_tracker(9)
• struct scsiio_tracker(9)
• struct request_tracker(9)
• struct _tr_list(9)
• struct _sc_list(9)
• struct _event_ack_list(9)
• struct io_uring_poll_queue(9)
• struct virtual_phy(9)
• struct hba_port(9)
• struct htb_rel_query(9)
• struct MPT3SAS_ADAPTER(9)

go read all of them, it's giving study group 📚💖

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okay and finally, the cute sign-off 🎀 this page lives under ./drivers/scsi/mpt3sas and it's dated October 2026, so yeah — drive safe, request your irq responsibly, and remember: the reply queue is always the main character. periodt. 💅✨