**Summary**
Enable kernel support for Solarflare Siena-series cards.
**Use case**
These cards are inexpensive, and work well, provided that support for them is enabled in the kernel
**Additional information**
Kernel devs broke these cards out into their own Kconfig, so SFC alone is insufficient
pci:
```
01:00.0 Ethernet controller: Solarflare Communications SFC9020 10G Ethernet Controller
01:00.1 Ethernet controller: Solarflare Communications SFC9020 10G Ethernet Controller
```
udev
```
aaron@spqr:~$ udevadm info /sys/class/net/eth0
P: /devices/pci0000:00/0000:00:01.0/0000:01:00.0/net/eth0
M: eth0
R: 0
U: net
I: 2
E: DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0/net/eth0
E: SUBSYSTEM=net
E: INTERFACE=eth0
E: IFINDEX=2
E: USEC_INITIALIZED=820132
E: ID_NET_NAMING_SCHEME=v252
E: ID_NET_NAME_MAC=enx000f5321ed80
E: ID_OUI_FROM_DATABASE=Solarflare Communications Inc.
E: ID_NET_NAME_PATH=enp1s0f0np0
E: ID_BUS=pci
E: ID_VENDOR_ID=0x1924
E: ID_MODEL_ID=0x0803
E: ID_PCI_CLASS_FROM_DATABASE=Network controller
E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
E: ID_VENDOR_FROM_DATABASE=Solarflare Communications
E: ID_MODEL_FROM_DATABASE=SFC9020 10G Ethernet Controller (SFN6122F-R7 SFP+ Server Adapter)
E: ID_MM_CANDIDATE=1
E: ID_PATH=pci-0000:01:00.0
E: ID_PATH_TAG=pci-0000_01_00_0
E: ID_NET_DRIVER=sfc_siena
E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
E: ID_NET_NAME=eth0
E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/eth0 /sys/subsystem/net/devices/eth0
E: TAGS=:systemd:
E: CURRENT_TAGS=:systemd:
```
Kconfig from a system running with a custom-compiled kernel on sagitta (probably should have enabled SRIOV for mine, but didn't notice at the time)
```
aaron@spqr:~$ zgrep SFC /proc/config.gz
CONFIG_SFC=m
CONFIG_SFC_MCDI_MON=y
CONFIG_SFC_SRIOV=y
CONFIG_SFC_MCDI_LOGGING=y
CONFIG_SFC_FALCON=m
CONFIG_SFC_SIENA=m
CONFIG_SFC_SIENA_MCDI_MON=y
# CONFIG_SFC_SIENA_SRIOV is not set
CONFIG_SFC_SIENA_MCDI_LOGGING=y
```
An unmodified 1.5-stream-2025-Q1
```
vyos@vyos:~$ zgrep SFC /proc/config.gz
CONFIG_SFC=m
CONFIG_SFC_MCDI_MON=y
CONFIG_SFC_SRIOV=y
CONFIG_SFC_MCDI_LOGGING=y
CONFIG_SFC_FALCON=m
# CONFIG_SFC_SIENA is not set
```
I built the modified config two above, when moving from 1.3.x, where it had been working prior.
ref: T3312