if_vtnet(4) [freebsd man page]
VTNET(4) BSD Kernel Interfaces Manual VTNET(4) NAME
vtnet -- VirtIO Ethernet driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device vtnet Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_vtnet_load="YES" DESCRIPTION
The vtnet device driver provides support for VirtIO Ethernet devices. If the hypervisor advertises the appreciate features, the vtnet driver supports TCP/UDP checksum offload for both transmit and receive, TCP segmentation offload (TSO), TCP large receive offload (LRO), and hardware VLAN tag stripping/insertion features, as well as a multicast hash filter, as well as Jumbo Frames (up to 9216 bytes), which can be configured via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. For more information on configuring this device, see ifconfig(8). LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.vtnet.csum_disable hw.vtnet.X.csum_disable This tunable disables receive and send checksum offload. The default value is 0. hw.vtnet.tso_disable hw.vtnet.X.tso_disable This tunable disables TSO. The default value is 0. hw.vtnet.lro_disable hw.vtnet.X.lro_disable This tunable disables LRO. The default value is 0. hw.vtnet.mq_disable hw.vtnet.X.mq_disable This tunable disables multiqueue. The default value is 0. hw.vtnet.mq_max_pairs hw.vtnet.X.mq_max_pairs This tunable sets the maximum number of transmit and receive queue pairs. Multiple queues are only supported when the Multiqueue feature is negotiated. This driver supports a maximum of 8 queue pairs. The number of queue pairs used is the lesser of the maximum supported by the driver and the hypervisor, the number of CPUs present in the guest, and this tunable if not zero. The default value is 0. SEE ALSO
arp(4), netintro(4), ng_ether(4), virtio(4), vlan(4), ifconfig(8) HISTORY
The vtnet driver was written by Bryan Venteicher <bryanv@FreeBSD.org>. It first appeared in FreeBSD 9.0. CAVEATS
The vtnet driver only supports LRO when the hypervisor advertises the mergeable buffer feature. BSD
January 22, 2012 BSD
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ALE(4) BSD Kernel Interfaces Manual ALE(4) NAME
ale -- Atheros AR8121/AR8113/AR8114 Gigabit/Fast Ethernet driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device miibus device ale Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_ale_load="YES" DESCRIPTION
The ale device driver provides support for Atheros AR8121 PCI Express Gigabit Ethernet controllers and Atheros AR8113/AR8114 PCI Express Fast Ethernet controllers. All LOMs supported by the ale driver have TCP/UDP/IP checksum offload for both receive and transmit, TCP segmentation offload (TSO), hardware VLAN tag stripping/insertion features, Wake On Lan (WOL) and an interrupt coalescing/moderation mechanism as well as a 64-bit multicast hash filter. The AR8121 also supports Jumbo Frames (up to 8132 bytes), which can be configured via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. The ale 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). 10baseT/UTP Set 10Mbps operation. 100baseTX Set 100Mbps (Fast Ethernet) operation. 1000baseTX Set 1000baseTX operation over twisted pair. The ale 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). HARDWARE
The ale device driver provides support for the following Ethernet controllers: o Atheros AR8113 PCI Express Fast Ethernet controller o Atheros AR8114 PCI Express Fast Ethernet controller o Atheros AR8121 PCI Express Gigabit Ethernet controller LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.ale.msi_disable This tunable disables MSI support on the Ethernet hardware. The default value is 0. hw.ale.msix_disable This tunable disables MSI-X support on the Ethernet hardware. The default value is 0. SYSCTL VARIABLES
The following variables are available as both sysctl(8) variables and loader(8) tunables: dev.ale.%d.int_rx_mod Maximum amount of time to delay receive interrupt processing in units of 1us. The accepted range is 0 to 130000, the default is 30(30us). Value 0 completely disables the interrupt moderation. dev.ale.%d.int_tx_mod Maximum amount of time to delay transmit interrupt processing in units of 1us. The accepted range is 0 to 130000, the default is 1000(1ms). Value 0 completely disables the interrupt moderation. dev.ale.%d.process_limit Maximum amount of Rx frames to be processed in the event loop before rescheduling a taskqueue. The accepted range is 32 to 255, the default value is 128 events. The interface does not need to be brought down and up again before a change takes effect. SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8) HISTORY
The ale driver was written by Pyun YongHyeon <yongari@FreeBSD.org>. It first appeared in FreeBSD 7.1. BSD
November 12, 2008 BSD