The interfaces file identifies all adapters in the PTP slave server and identifies the timestamping capabilities. In the following example, some SFN7122F adapter interfaces are identified as being hardware timestamping capable.
# cat interfaces
| interface | ptp-caps | pkt-timestamping-caps | product-name |
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| eth0 | - | - | Broadcom NetXtreme II Ethernet Controller |
| eth1 | - | - | Broadcom NetXtreme II Ethernet Controller |
| eth2 | hw | - | Solarflare SFN5322F SFP+ Time Stamping Server Adapter |
| eth3 | - | - | Solarflare SFN5322F SFP+ Time Stamping Server Adapter |
| eth4 | hw | hw | Solarflare SFN7122F SFP+ Server Adapter |
| eth5 | hw | hw | Solarflare SFN7122F SFP+ Server Adapter |
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