/sys/class/iscsi_transport
| Field | Value |
|---|---|
| Subsystem | iSCSI transport class, drivers/scsi/scsi_transport_iscsi.c (struct class iscsi_transport_class, name “iscsi_transport”) |
| Config gate | CONFIG_SCSI_ISCSI_ATTRS, tristate, depends on SCSI and NET, selects BLK_DEV_BSGLIB (drivers/scsi/Kconfig); transport modules such as iscsi_tcp depend on it |
| ABI documentation | none found - checked the stable/, testing/ and obsolete/ ABI listings and grep for iscsi; attributes below are named by drivers/scsi/scsi_transport_iscsi.c |
| Since | not stated by the sources checked (no ABI What: entries exist) |
| Live (5.10.134 host) | class present with 0 entries (no iSCSI transport loaded) |
| Ledger ID | SYSC-iscsi_transport |
What it represents
One device per registered iSCSI transport implementation (the software transport iscsi_tcp and offload drivers register with iscsi_register_transport()). These devices are the transport bookkeeping layer; the classes iscsi_host.md, iscsi_iface.md, iscsi_endpoint.md, iscsi_session.md and iscsi_connection.md carry the per-object state.
Relationship to the device model
The transport device exposes the capability set of the implementation to user space (netlink discovers it via the handle value). All session, connection, iface and endpoint objects reference their transport through the same iscsi_internal structure (scsi_transport_iscsi.c).
Attributes (source: drivers/scsi/scsi_transport_iscsi.c iscsi_transport_attrs[])
| Attribute | R/W | Meaning |
|---|---|---|
handle | RO | 64-bit transport handle (sysfs_emit “%llu”); read requires CAP_SYS_ADMIN, otherwise -EACCES |
caps | RO | Transport capability bitmask, format “0x%x” |
Safety and writes
Both attributes are read-only. The handle is deliberately privileged: user space needs it to address the transport through the iSCSI netlink interface (iscsi_uevent, same file), so exposing it unprivileged would leak a kernel-addressing token. Empty on the container host.
References
- drivers/scsi/scsi_transport_iscsi.c (fetched from torvalds/linux master into source-cache)
- drivers/scsi/iscsi_tcp.c (software transport that registers a transport)
- sysfs overview, ledger, iSCSI storage page, iscsi_host, iscsi_session