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VTE(4) Kernel Interfaces Manual VTE(4) NAME vte -- Vortex86 RDC R6040 Fast Ethernet driver SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: device miibus device vte Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_vte_load="YES" DESCRIPTION The vte device driver provides support for RDC R6040 Fast Ethernet con- troller which is commonly found on Vortex86 System On a Chip (SoC). The RDC R6040 has integrated 10/100 PHY for 10/100Mbps support in full or half-duplex. The controller supports interrupt moderation mecha- nism, a 64-bit multicast hash filter, VLAN over-size frame and four station addresses. The vte device driver uses three station addresses out of four as perfect multicast filter. The vte 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. The vte 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 vte device driver provides support for the following Ethernet con- trollers: • DM&P Vortex86 RDC R6040 Fast Ethernet controller LOADER TUNABLES Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.vte.tx_deep_copy The RDC R6040 controller has no auto-padding support for short frames and the controller's DMA engine does not have capability to handle multiple buffers for a TX frame such that driver has to create a single contiguous TX buffer. This hardware limita- tion leads to poor TX performance since most of CPU cycles are wasted on both de-fragmenting mbuf chains and padding. This tunable enables deep copy operation for TX frames such that driver will spend less CPU cycles in de-fragmentation with the cost of extra TX buffer memory. The default value is 1 to use deep copy. SYSCTL VARIABLES The following variables are available as both sysctl(8) variables and loader(8) tunables: dev.vte.%d.rx_mod Maximum number of packets to fire RX completion interrupt. The accepted range is 0 to 15, the default is 15. dev.vte.%d.tx_mod Maximum number of packets to fire TX completion interrupt. The accepted range is 0 to 15, the default is 15. dev.vte.%d.stats Show hardware MAC statistics maintained in driver. SEE ALSO altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8) DM&P Electronics Inc. Vortex86, http://www.dmp.com.tw. HISTORY The vte driver was written by Pyun YongHyeon <yongari@FreeBSD.org>. It first appeared in FreeBSD 8.3. FreeBSD 14.3 December 30, 2010 VTE(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | SYSCTL VARIABLES | SEE ALSO | HISTORY
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