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diff --git a/src/seastar/doc/network-configuration.md b/src/seastar/doc/network-configuration.md new file mode 100644 index 000000000..404b4690a --- /dev/null +++ b/src/seastar/doc/network-configuration.md @@ -0,0 +1,65 @@ +Network Configuration +--------------------- + +In order to support multiple network devices in Seastar, new Network Configuration format has to be introduced. +New format is Yaml based and contains a list of network devices along with its IP parameters and optional (if DPDK is used) hardware parameters. +The new configuration can be provided either by command line with --net-config option or by configuration file by --net-config-file. + +### DPDK access +Network device (called port in DPDK) can be accessed by either port index ( zero based index of device shown by dpdk-setup.sh ) or its PCI address (shown by lspci, lshw tools) + +Example config line with pci address given: + +``` +eth0: {pci_address: 0000:06:00.0, ip: 192.168.100.10, gateway: 192.168.100.1, netmask: 255.255.255.0 } +``` + +Example config line with port index given: + +``` +eth0: {port_index: 0, ip: 192.168.100.10, gateway: 192.168.100.1, netmask: 255.255.255.0 } +``` + +Please note that device name - eth0 above, is not used by DPDK itself, it remains only for configuration consistency. +The hardware configuration has to be specied in the same way accross all network devices, so for example if pci_address is specified for one network device, port_index cannot be specified for any other. + + +## Non-DPDK access +When there is no pci_address neither port_index defined then Non-DPDK access is assumed provided by libvirt deamon (see native-stack.md), eg: + +``` +virbr0: { ip: 192.168.100.10, gateway: 192.168.100.1, netmask: 255.255.255.0 } +``` + +## Other hardware related options + +There are other hardware related optional options, some of the are common for both DPDK and non-DPDK mode +- lro ( large receive offload ), boolean, deafult true +- tso ( tcp segmentation offload ), boolean, default true +- ufo ( udp fragmentation offload ), boolean, default true +- hw-fc ( hardware flow control ), boolean, default true, +- csum-offload ( IP checksum offload ), boolean, default true +- ring-size ( device ring buffer size ), unsigned, default 256, libvirt only +- event-index ( VIRTIO_RING_F_EVENT_IDX support enabled ), boolean, default true, libvirt only + + +## DHCP + +IP configuration can be set by either IP/gateway/netmask (as seen in examples above), but also by DHCP with dhcp=true setting, eg: + +``` +eth0: {pci_address: 0000:06:00.0, dhcp=true} +``` + +DHCP can be selected per network device, so it would also be perfectly valid to define dhcp for eth0, but ip/netmask/gateway for eth1. + + +## Multiple devices +Configuration formay for multiple devices is a comma separated lists of single devices with added YAML brackets, eg: + +``` +{virbr0: { ip: 192.168.100.10, gateway: 192.168.100.1, netmask: 255.255.255.0 } , virbr1: { dhcp: true } } +``` + + + |