--- James Bottomley <James.Bottomley@xxxxxxxxxxxx> wrote:
> Then the phy can have a simple link to the port it's a
> member of.
This is already the case in the SAS stack. Here is an example of wide and
narrow ports. The wide port in this example connects to a domain with
three cascaded expanders; the narrow port to a SAS disk.
$tree -d /sys/devices/pci0000\:01/0000\:01\:04.0/host11/sas/ha
/sys/devices/pci0000:01/0000:01:04.0/host11/sas/ha
|-- phys
| |-- 0
| | `-- port -> ../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/ports/0
| |-- 1
| |-- 2
| |-- 3
| |-- 4
| | `-- port -> ../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/ports/1
| |-- 5
| | `-- port -> ../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/ports/1
| |-- 6
| | `-- port -> ../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/ports/1
| `-- 7
| `-- port -> ../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/ports/1
`-- ports
|-- 0
| |-- domain
| | `-- 500000e000031c12
| | `-- LUNS
| | `-- 0000000000000000
| `-- phys
| `-- 0 ->
../../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/phys/0
`-- 1
|-- domain
| `-- 50001c1716010600
| |-- 50001c1071609c00
| | |-- 50001c1071609c02
| | |-- 5000c50000102a65
| | | `-- LUNS
| | | `-- 0000000000000000
| | `-- 5005076a000001e0
| | |-- 5000c50000513385
| | | `-- LUNS
| | | `-- 0000000000000000
| | |-- 5005076a000001ed
| | | `-- LUNS
| | | `-- 0000000000000000
| | `-- 5c50000000409c11
| | `-- LUNS
| | `-- 0000000000000000
| |-- 50001c1716010603
| |-- 50001c171601060d
| | `-- LUNS
| | `-- 0000000000000000
| `-- 5000c50000513329
| `-- LUNS
| `-- 0000000000000000
`-- phys
|-- 4 ->
../../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/phys/4
|-- 5 ->
../../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/phys/5
|-- 6 ->
../../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/phys/6
`-- 7 ->
../../../../../../../../../devices/pci0000:01/0000:01:04.0/host11/sas/ha/phys/7
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