STRUCT _SCSI_IO_TRANSFER(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 struct _scsi_io_transfer 🎀

okay bestie, buckle up — this is the Kernel API Manual page for struct _scsi_io_transfer, and it's giving "the data structure that makes the whole SCSI conversation happen" ✨ no cap.

💖 NAME 💖

struct _scsi_io_transfer — scsi io transfer. that's it, that's the name, and honestly it ate 💅

🦋 SYNOPSIS 🦋

here's the whole struct, copied exactly, don't touch a single character or the compiler WILL come for you:

struct _scsi_io_transfer {
    u16 handle;
    u8 is_raid;
    enum dma_data_direction dir;
    u32 data_length;
    dma_addr_t data_dma;
    u8 sense[SCSI_SENSE_BUFFERSIZE];
    u32 lun;
    u8 cdb_length;
    u8 cdb[32];
    u8 timeout;
    u8 VF_ID;
    u8 VP_ID;
    u8 valid_reply;
    u32 sense_length;
    u16 ioc_status;
    u8 scsi_state;
    u8 scsi_status;
    u32 log_info;
    u32 transfer_length;
 };

🌸 Members 🌸

okay so every single field, one by one, because we do not skip members in this house 👑

  • handle — the sas device handle (the firmware hands you this one, you don't make it up yourself)
  • is_raid — a flag that gets set for hidden raid components 👀 sneaky lil guys
  • dir — the DMA direction: DMA_TO_DEVICE, DMA_FROM_DEVICE, (yes, it's listed with a trailing comma in the original, we're keeping it, it's part of the vibe)
  • data_length — the data transfer length
  • data_dma — the dma pointer to the data
  • sense — sense data. it's a buffer, SCSI_SENSE_BUFFERSIZE big, and it knows things
  • lun — the lun number
  • cdb_length — the cdb length
  • cdb — the cdb contents (32 bytes of pure intent)
  • timeout — the timeout for this command, so it doesn't just hang forever being dramatic 😭
  • VF_ID — the virtual function id
  • VP_ID — the virtual port id
  • valid_reply — a flag that gets set for a reply message
  • sense_length — the sense length
  • ioc_status — the ioc status
  • scsi_state — the scsi state
  • scsi_status — the scsi staus 🫶 (that's literally how it's spelled in the source, we do not editorialize, we just report)
  • log_info — log information
  • transfer_length — the data length transfer when there's a reply message, iykyk

✨ Description ✨

so what is this thing for? literally this: it's used for sending internal scsi commands to devices within this module 🔥

if you wanna know more, go refer to _scsi_send_scsi_io — that's the whole rec, bestie, the manpage said it, not me 💜

🌈 SEE ALSO 🌈

buckle up babes, this list is iconic and also lowkey a whole novel. every single one, in order, no skipping:

bestie real talk: this thing is only for sending internal scsi commands to devices within this module, k? it's not a public playground, it's an in-module situation, and the manpage said so 🫶

okay that's the whole page, you survived, I'm so proud of you 😭💖 this little gem lives down in ./drivers/scsi/mpt3sas, dated October 2026 — go forth and slay, and remember: the struct is the moment, the firmware assigns the handle, periodt 💅✨

📦 where this page comes from