support enable_jumbo_frames option in instance from-image subcommand

[askfongjojo]

Catch up on the support for a new instance attribute known as enable_jumbo_frames. The option is uncommon (use of it requires upstream network support and fleet-admin explicitly enabling the option) but having the CLI support will simplify internal test automation.

[askfongjojo]

Testing notes

$ oxide instance from-image -h
Launch an instance from a disk image.

Usage: oxide instance from-image [OPTIONS] --name <NAME> --project <PROJECT> --description <DESCRIPTION> --hostname <HOSTNAME> --memory <MEMORY> --ncpus <NCPUS> --image <IMAGE> --size <SIZE>

Options:
      --name <NAME>                                 Name of the instance to create
      --project <PROJECT>                           Project for image and instance
      --description <DESCRIPTION>                   Description of the instance
      --hostname <HOSTNAME>                         The hostname to be assigned to the instance
      --memory <MEMORY>                             Amount of RAM to be allocated to the instance; unit suffixes are in powers of two (1k = 1024 bytes)
                                                    for example: 6GiB, 512k, 2048mib
      --ncpus <NCPUS>                               Number of vCPUs to be allocated to the instance
      --cpu-platform <CPU_PLATFORM>                 CPU platform to place the instance
      --anti-affinity-group <ANTI_AFFINITY_GROUPS>  Anti-affinity group(s) to add the instance to (may be specified multiple times)
      --enable-jumbo-frames                         Enable jumbo frames (8500 byte MTU) on the instance's primary OPTE
      --image <IMAGE>                               Source image
      --size <SIZE>                                 Boot disk size; unit suffixes are in powers of two (1k = 1024 bytes) for example: 6GiB, 512k,
                                                    2048mib
      --start                                       Start the instance immediately
  -h, --help                                        Print help

$ oxide --insecure --timeout 300 --profile oxide-rack2 instance from-image --image f7edf1ae-90b7-4884-9a38-40178f3a24a2 --name jumbo-dumbo --project product-assurance --description 'iperf server instance for the antbench scenario' --hostname iperf-server-avx512 --memory 4g --ncpus 2 --cpu-platform amd_turin_v2  --size 20g --start --enable-jumbo-frames
instance 6dff744a-ddc5-44ba-ada3-c8efc7c4f736 created

$ oxide --profile oxide-rack2 instance view --instance 6dff744a-ddc5-44ba-ada3-c8efc7c4f736
{
  "auto_restart_enabled": true,
  "boot_disk_id": "aa815698-e5c6-44fc-ad99-1fdb4007f02d",
  "cpu_platform": "amd_turin_v2",
  "description": "iperf server instance for the antbench scenario",
  "enable_jumbo_frames": true,
  "hostname": "iperf-server-avx512",
  "id": "6dff744a-ddc5-44ba-ada3-c8efc7c4f736",
  "memory": 4294967296,
  "name": "jumbo-dumbo",
  "ncpus": 2,
  "project_id": "85355f83-899b-461e-91ec-9e29d2ba50d1",
  "run_state": "starting",
  "time_created": "2026-08-25T21:48:50.357194Z",
  "time_modified": "2026-08-25T21:48:50.357194Z",
  "time_run_state_updated": "2026-08-25T21:48:58.652846Z"
}

$ oxide --insecure --timeout 300 --profile oxide-rack2 instance from-image --image f7edf1ae-90b7-4884-9a38-40178f3a24a2 --name dumbo-jumbo --project product-assurance --description 'iperf server instance for the antbench scenario' --hostname iperf-server-avx512 --memory 4g --ncpus 2 --cpu-platform amd_turin_v2  --size 20g --start
instance fa2e4c79-5f6f-427c-a552-0397489c7b0b created

$ oxide --profile oxide-rack2 instance view --instance fa2e4c79-5f6f-427c-a552-0397489c7b0b
{
  "auto_restart_enabled": true,
  "boot_disk_id": "1bad8805-33fa-4865-83d0-6d6ea24f2bb2",
  "cpu_platform": "amd_turin_v2",
  "description": "iperf server instance for the antbench scenario",
  "enable_jumbo_frames": false,
  "hostname": "iperf-server-avx512",
  "id": "fa2e4c79-5f6f-427c-a552-0397489c7b0b",
  "memory": 4294967296,
  "name": "dumbo-jumbo",
  "ncpus": 2,
  "project_id": "85355f83-899b-461e-91ec-9e29d2ba50d1",
  "run_state": "running",
  "time_created": "2026-08-25T22:07:41.431991Z",
  "time_modified": "2026-08-25T22:07:41.431991Z",
  "time_run_state_updated": "2026-08-25T22:07:55.997564Z"
}

[ahl]

looks good