The qeth device driver supports many networking transport
protocol functions, as well as offload functions and problem determination
functions.
The qeth device driver supports functions listed in
Table 1 and
Table 2.
Table 1. Real connections
| Function |
OSA Layer 2 |
OSA Layer 3 |
HiperSockets Layer 2 |
HiperSockets Layer 3 |
| Basic device or protocol functions |
| IPv4/multicast/broadcast |
Yes/Yes/Yes |
Yes/Yes/Yes |
Yes/Yes/Yes |
Yes/Yes/Yes |
| IPv6/multicast |
Yes/Yes |
Yes/Yes |
Yes/Yes |
Yes/Yes |
| Non-IP traffic |
Yes |
Yes |
Yes |
No |
| VLAN IPv4/IPv6/non IP |
sw/sw/sw |
hw/sw/sw |
sw/sw/sw |
hw/hw/No |
| Linux ARP |
Yes |
No (hw ARP) |
Yes |
No |
| Linux neighbor solicitation |
Yes |
Yes |
Yes |
No |
| Unique MAC address |
Yes (random for LPAR) |
No |
Yes |
Yes |
| Change MAC address |
Yes |
No |
Yes |
No |
| Promiscuous mode |
No |
No |
No |
- Yes (for sniffer=1)
- No (for sniffer=0)
|
| MAC headers send/receive |
Yes/Yes |
faked/faked |
Yes/Yes |
faked/faked |
| ethtool support |
Yes |
Yes |
Yes |
Yes |
| Bonding |
Yes |
No |
Yes |
No |
| Priority queueing |
Yes |
Yes |
Yes |
Yes |
| Bridge port |
No |
No |
Yes |
No |
| Offload features |
| TCP segmentation offload (TSO) |
No |
Yes |
No |
No |
| Inbound (rx) checksum |
Yes |
Yes |
No |
No |
| Outbound (tx) checksum |
Yes |
Yes |
No |
No |
| OSA/QETH specific features |
| Special device driver setup for VIPA |
No |
required |
No |
Yes |
| Special device driver setup for proxy ARP |
No |
required |
No |
Yes |
| Special device driver setup for IP takeover |
No |
required |
No |
Yes |
| Special device driver setup for routing IPv4/IPv6 |
No/No |
required/required |
No/No |
Yes/Yes |
| Receive buffer count |
Yes |
Yes |
Yes |
Yes |
| Direct connectivity to z/OS® |
Yes by HW |
Yes |
No |
Yes |
| SNMP support |
Yes |
Yes |
No |
No |
| Multiport support |
Yes |
Yes |
No |
No |
| Data connection isolation |
Yes |
Yes |
No |
No |
| Problem determination |
| Hardware trace |
No |
Yes |
No |
No |
Legend:
- No - Function not supported or not required.
- Yes - Function supported.
- hw - Function performed by hardware.
- sw - Function performed by software.
- faked - Function will be simulated.
- required - Function requires special setup.
|
Table 2. z/VM VSWITCH
or Guest LAN connections
| Function |
Emulated OSA Layer 2 |
Emulated OSA Layer 3 |
Emulated HiperSockets Layer 3 |
| Basic device or protocol features |
| IPv4/multicast/broadcast |
Yes/Yes/Yes |
Yes/Yes/Yes |
Yes/Yes/Yes |
| IPv6/multicast |
Yes/Yes |
Yes/Yes |
No/No |
| Non-IP traffic |
Yes |
No |
No |
| VLAN IPv4/IPv6/non IP |
sw/sw/sw |
hw/sw/No |
hw/No/No |
| Linux ARP |
Yes |
No (hw ARP) |
No |
| Linux neighbor solicitation |
Yes |
Yes |
No |
| Unique MAC address |
Yes |
Yes |
Yes |
| Change MAC address |
Yes |
No |
No |
| Promiscuous mode |
Yes |
Yes |
No |
| MAC headers send/receive |
Yes/Yes |
faked/faked |
faked/faked |
| ethtool support |
Yes |
Yes |
Yes |
| Bonding |
Yes |
No |
No |
| Priority queueing |
Yes |
Yes |
Yes |
| Offload features |
| TSO |
No |
No |
No |
| rx HW checksum |
No |
No |
No |
| OSA/QETH specific features |
| Special device driver setup for VIPA |
No |
required |
required |
| Special device driver setup for proxy ARP |
No |
required |
required |
| Special device driver setup for IP takeover |
No |
required |
required |
| Special device driver setup for routing IPv4/IPv6 |
No/No |
required/required |
required/required |
| Receive buffer count |
Yes |
Yes |
Yes |
| Direct connectivity to z/OS |
No |
Yes |
Yes |
| SNMP support |
No |
No |
No |
| Multiport support |
No |
No |
No |
| Data connection isolation |
No |
No |
No |
| Problem determination |
| Hardware trace |
No |
No |
No |
Legend:
- No - Function not supported or not required.
- Yes - Function supported.
- hw - Function performed by hardware.
- sw - Function performed by software.
- faked - Function will be simulated.
- required - Function requires special setup.
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