---
name: "if_stge"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/if_stge"
---

# if\_stge(4)

Sundance/Tamarack TC9021 Gigabit Ethernet adapter driver

## NAME

**stge** – Sundance/Tamarack TC9021 Gigabit Ethernet adapter driver

## SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

**device miibus** **device stge**

Alternatively, to load the driver as a module at boot time, place the following line in [loader.conf(5)](/loader.conf/5.md):

```
if_stge_load="YES"
```

## DESCRIPTION

The **stge** device driver provides support for various NICs based on the Sundance/Tamarack TC9021 Gigabit Ethernet controller chip.

The Sundance/Tamarack TC9021 is found on the D-Link DGE-550T and the Antares Microsystems Gigabit Ethernet board. It uses an external PHY or an external 10-bit interface.

All NICs supported by the **stge** driver have TCP/UDP/IP checksum offload for both receive and transmit, hardware VLAN tag stripping/insertion features, and receive interrupt moderation mechanism as well as a 64-bit multicast hash filter. The Sundance/Tamarack TC9021 supports TBI (ten bit interface) and GMII transceivers, which means it can be used with either copper or 1000baseX fiber applications.

The Sundance/Tamarack TC9021 also supports jumbo frames, which can be configured via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the [ifconfig(8)](/ifconfig/8.md) utility configures the adapter to receive and transmit jumbo frames.

The **stge** driver supports the following media types:

- **autoselect**

  Enable autoselection of the media type and options. The user can manually override the autoselected mode by adding media options to [rc.conf(5)](/rc.conf/5.md).

- **10baseT/UTP**

  Set 10Mbps operation. The [ifconfig(8)](/ifconfig/8.md) **mediaopt** option can also be used to select either **full-duplex** or **half-duplex** modes.

- **100baseTX**

  Set 100Mbps (Fast Ethernet) operation. The [ifconfig(8)](/ifconfig/8.md) **mediaopt** option can also be used to select either **full-duplex** or **half-duplex** modes.

- **1000baseTX**

  Set 1000baseTX operation over twisted pair. The Sundance/Tamarack supports 1000Mbps in **autoselect** mode only.

The **stge** driver supports the following media options:

- **full-duplex**

  Force full duplex operation.

- **half-duplex**

  Force half duplex operation.

For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## HARDWARE

The **stge** driver provides support for various NICs based on the Sundance/Tamarack TC9021 based Gigabit Ethernet controller chips, including:

- Antares Microsystems Gigabit Ethernet

- ASUS NX1101 Gigabit Ethernet

- D-Link DL-4000 Gigabit Ethernet

- IC Plus IP1000A Gigabit Ethernet

- Sundance ST-2021 Gigabit Ethernet

- Sundance ST-2023 Gigabit Ethernet

- Sundance TC9021 Gigabit Ethernet

- Tamarack TC9021 Gigabit Ethernet

## SYSCTL VARIABLES

The following variables are available as both [sysctl(8)](/sysctl/8.md) variables and [loader(8)](/loader/8.md) tunables:

- *dev.stge.%d.rxint\_nframe*

  Number of frames between RxDMAComplete interrupts. The accepted range is 1 to 255, default value is 8 frames. The interface has to be brought down and up again before a change takes effect.

- *dev.stge.%d.rxint\_dmawait*

  Maximum amount of time to wait in 1us increments before issuing an Rx interrupt if the number of frames received is less than *rxint\_nframe*. The accepted range is 0 to 4194, default value is 30 microseconds. The interface has to be brought down and up again before a change takes effect.

## SEE ALSO

[altq(4)](/altq/4.md), [arp(4)](/arp/4.md), [miibus(4)](/miibus/4.md), [netintro(4)](/netintro/4.md), [ng\_ether(4)](/ng_ether/4.md), [polling(4)](/polling/4.md), [vlan(4)](/vlan/4.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **stge** driver was ported from NetBSD and first appeared in FreeBSD 6.2. The NetBSD version was written by Jason R. Thorpe ⟨*thorpej@NetBSD.org*⟩.

## AUTHORS

The **stge** driver was ported by Pyun YongHyeon ⟨*yongari@FreeBSD.org*⟩.