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CXGBE(4) FreeBSD Kernel Interfaces Manual CXGBE(4) NAME cxgbe -- Chelsio T4 10Gb and 1Gb Ethernet adapter driver SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: device cxgbe To load the driver as a module at boot time, place the following line in loader.conf(5): if_cxgbe_load="YES" DESCRIPTION The cxgbe driver provides support for PCI Express Ethernet adapters based on the Chelsio Terminator 4 (T4) ASIC. The driver supprts Jumbo Frames, Transmit/Receive checksum offload, TCP segmentation offload (TSO), Large Receive Offload (LRO), VLAN tag insertion/extraction, VLAN checksum offload, VLAN TSO, and Receive Side Steering (RSS). For further hardware information and questions related to hardware requirements, see http://www.chelsio.com/. For more information on configuring this device, see ifconfig(8). HARDWARE The cxgbe driver supports 10Gb and 1Gb Ethernet adapters based on the T4 ASIC: +o Chelsio T420-CR +o Chelsio T422-CR +o Chelsio T440-CR +o Chelsio T420-BCH +o Chelsio T440-BCH +o Chelsio T440-CH +o Chelsio T420-SO +o Chelsio T420-CX +o Chelsio T420-BT +o Chelsio T404-BT LOADER TUNABLES Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.cxgbe.max_ntxq_10G_port The maximum number of tx queues to use for a 10Gb port. The default value is 8. hw.cxgbe.max_nrxq_10G_port The maximum number of rx queues to use for a 10Gb port. The default value is 8. hw.cxgbe.max_ntxq_1G_port The maximum number of tx queues to use for a 1Gb port. The default value is 2. hw.cxgbe.max_nrxq_1G_port The maximum number of rx queues to use for a 1Gb port. The default value is 2. hw.cxgbe.holdoff_timer_idx_10G hw.cxgbe.holdoff_timer_idx_1G The timer index value to use to delay interrupts. The holdoff timer list has the values 1, 5, 10, 50, 100, and 200 by default (all values are in microseconds) and the index selects a value from this list. The default value is 1 for both 10Gb and 1Gb ports, which means the timer value is 5us. hw.cxgbe.holdoff_pktc_idx_10G hw.cxgbe.holdoff_pktc_idx_1G The packet-count index value to use to delay interrupts. The packet-count list has the values 1, 8, 16, and 32 by default and the index selects a value from this list. The default value is 2 for both 10Gb and 1Gb ports, which means 16 packets (or the hold- off timer going off) before an interrupt is generated. hw.cxgbe.qsize_txq The size, in number of entries, of the descriptor ring used for a tx queue. A buf_ring of the same size is also allocated for additional software queuing. See ifnet(9). The default value is 1024. hw.cxgbe.qsize_rxq The size, in number of entries, of the descriptor ring used for an rx queue. The default value is 1024. SUPPORT For general information and support, go to the Chelsio support website at: http://www.chelsio.com/. If an issue is identified with this driver with a supported adapter, email all the specific information related to the issue to <support@chelsio.com>. SEE ALSO altq(4), arp(4), cxgb(4), netintro(4), ng_ether(4), ifconfig(8) HISTORY The cxgbe device driver first appeared in FreeBSD 9.0 AUTHORS The cxgbe driver was written by Navdeep Parhar <np@FreeBSD.org>. FreeBSD 11.1 February 14, 2011 FreeBSD 11.1
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | SUPPORT | SEE ALSO | HISTORY | AUTHORS
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