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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	10.1		       February	14, 2011		  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | SUPPORT | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=cxgbe&sektion=4&manpath=FreeBSD+9.0-RELEASE>

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