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SFXGE(4)	       FreeBSD Kernel Interfaces Manual		      SFXGE(4)

NAME
     sfxge -- Solarflare 10Gb Ethernet adapter driver

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

	   device sfxge

     To	load the driver	as a module at boot time, place	the following line in
     loader.conf(5):

	   sfxge_load="YES"

DESCRIPTION
     The sfxge driver provides support for 10Gb	Ethernet adapters based	on
     Solarflare	SFC9000	family controllers.  The driver	supports jumbo frames,
     transmit/receive checksum offload,	TCP Segmentation Offload (TSO),	Large
     Receive Offload (LRO), VLAN checksum offload, VLAN	TSO, and Receive Side
     Scaling (RSS) using MSI-X interrupts.

     The driver	allocates 1 receive queue, transmit queue, event queue and IRQ
     per CPU up	to a maximum of	64.  IRQ affinities should be spread out using
     cpuset(1).	 Interrupt moderation may be controlled	through	the sysctl
     dev.sfxge.%d.int_mod (units are microseconds).

     For more information on configuring this device, see ifconfig(8).

     A large number of MAC, PHY	and data path statistics are available under
     the sysctl	dev.sfxge.%d.stats.  The adapter's VPD fields including	its
     serial number are available under the sysctl dev.sfxge.%d.vpd.

HARDWARE
     The sfxge driver supports all 10Gb	Ethernet adapters based	on Solarflare
     SFC9000 family controllers.

LOADER TUNABLES
     Tunables can be set at the	loader(8) prompt before	booting	the kernel or
     stored in loader.conf(5).	Actual values can be obtained using sysctl(8).

     hw.sfxge.rx_ring
	     The maximum number	of descriptors in a receive queue ring.	 Sup-
	     ported values are:	512, 1024, 2048	and 4096.

     hw.sfxge.tx_ring
	     The maximum number	of descriptors in a transmit queue ring.  Sup-
	     ported values are:	512, 1024, 2048	and 4096.

     hw.sfxge.tx_dpl_get_max
	     The maximum length	of the deferred	packet ``get-list'' for	queued
	     transmit packets (TCP and non-TCP), used only if the transmit
	     queue lock	can be acquired.  If a packet is dropped, the
	     tx_get_overflow counter is	incremented and	the local sender
	     receives ENOBUFS.	The value must be greater than 0.

     hw.sfxge.tx_dpl_get_non_tcp_max
	     The maximum number	of non-TCP packets in the deferred packet
	     ``get-list'' , used only if the transmit queue lock can be
	     acquired.	If a packet is dropped,	the tx_get_non_tcp_overflow
	     counter is	incremented and	the local sender receives ENOBUFS.
	     The value must be greater than 0.

     hw.sfxge.tx_dpl_put_max
	     The maximum length	of the deferred	packet ``put-list'' for	queued
	     transmit packets, used if the transmit queue lock cannot be
	     acquired.	If a packet is dropped,	the tx_put_overflow counter is
	     incremented and the local sender receives ENOBUFS.	 The value
	     must be greater than or equal to 0.

     hw.sfxge.tso_fw_assisted
	     Enable/disable usage of FW-assisted TSO if	supported by NIC
	     firmware.	Enabled	by default.

     hw.sfxge.N.max_rss_channels
	     The maximum number	of allocated RSS channels for the Nth adapter.
	     If	set to 0 or unset, the number of channels is determined	by the
	     number of CPU cores.

     hw.sfxge.lro.table_size
	     Size of the LRO hash table.  Must be a power of 2.	 A larger ta-
	     ble means we can accelerate a larger number of streams.

     hw.sfxge.lro.chain_max
	     The maximum length	of a hash chain.  If chains get	too long then
	     the lookup	time increases and may exceed the benefit of LRO.

     hw.sfxge.lro.idle_ticks
	     The maximum time (in ticks) that a	connection can be idle before
	     it's LRO state is discarded.

     hw.sfxge.lro.slow_start_packets
	     Number of packets with payload that must arrive in-order before a
	     connection	is eligible for	LRO.  The idea is we should avoid coa-
	     lescing segments when the sender is in slow-start because reduc-
	     ing the ACK rate can damage performance.

     hw.sfxge.lro.loss_packets
	     Number of packets with payload that must arrive in-order follow-
	     ing loss before a connection is eligible for LRO.	The idea is we
	     should avoid coalescing segments when the sender is recovering
	     from loss,	because	reducing the ACK rate can damage performance.

SUPPORT
     For general information and support, go to	the Solarflare support website
     at: https://support.solarflare.com.

SEE ALSO
     arp(4), netintro(4), ng_ether(4), vlan(4),	cpuset(1), ifconfig(8)

AUTHORS
     The sfxge driver was written by Philip Paeps and
     Solarflare	Communications,	Inc.

FreeBSD	10.2		       February	22, 2015		  FreeBSD 10.2

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

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=sfxge&manpath=FreeBSD+10.2-RELEASE>

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