142 lines
4.7 KiB
Groff
142 lines
4.7 KiB
Groff
.\" Copyright (c) 2011 Solarflare Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 22, 2015
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.Dt SFXGE 4
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.Os
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.Sh NAME
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.Nm sfxge
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.Nd "Solarflare 10Gb Ethernet adapter driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device sfxge"
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.Ed
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.Pp
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To load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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sfxge_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for 10Gb Ethernet adapters based on
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Solarflare SFC9000 family controllers.
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The driver supports jumbo
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frames, transmit/receive checksum offload, TCP Segmentation Offload
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(TSO), Large Receive Offload (LRO), VLAN checksum offload, VLAN TSO,
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and Receive Side Scaling (RSS) using MSI-X interrupts.
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.Pp
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The driver allocates 1 receive queue, transmit queue, event queue and
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IRQ per CPU up to a maximum of 64.
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IRQ affinities should be spread out using
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.Xr cpuset 1 .
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Interrupt moderation may be controlled through the sysctl
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.Va dev.sfxge.%d.int_mod
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(units are microseconds).
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.Pp
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Pp
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A large number of MAC, PHY and data path statistics are available
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under the sysctl
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.Va dev.sfxge.%d.stats .
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The adapter's VPD
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fields including its serial number are available under the sysctl
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.Va dev.sfxge.%d.vpd .
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.Sh HARDWARE
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The
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.Nm
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driver supports all 10Gb Ethernet adapters based on Solarflare SFC9000
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family controllers.
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.Sh LOADER TUNABLES
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Tunables can be set at the
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.Xr loader 8
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prompt before booting the kernel or stored in
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.Xr loader.conf 5 .
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Actual values can be obtained using
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.Xr sysctl 8 .
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.Bl -tag -width indent
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.It Va hw.sfxge.rx_ring
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The maximum number of descriptors in a receive queue ring.
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Supported values are: 512, 1024, 2048 and 4096.
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.It Va hw.sfxge.tx_ring
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The maximum number of descriptors in a transmit queue ring.
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Supported values are: 512, 1024, 2048 and 4096.
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.It Va hw.sfxge.tx_dpl_get_max
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The maximum length of the deferred packet
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.Dq get-list
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for queued transmit packets (TCP and non-TCP), used only if the transmit
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queue lock can be acquired.
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If a packet is dropped, the
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.Va tx_get_overflow
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counter is incremented and the local sender receives ENOBUFS.
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The value must be greater than 0.
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.It Va hw.sfxge.tx_dpl_get_non_tcp_max
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The maximum number of non-TCP packets in the deferred packet
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.Dq get-list
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, used only if the transmit queue lock can be acquired.
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If a packet is dropped, the
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.Va tx_get_non_tcp_overflow
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counter is incremented and the local sender receives ENOBUFS.
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The value must be greater than 0.
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.It Va hw.sfxge.tx_dpl_put_max
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The maximum length of the deferred packet
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.Dq put-list
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for queued transmit
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packets, used if the transmit queue lock cannot be acquired.
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If a packet is dropped, the
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.Va tx_put_overflow
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counter is incremented and the local sender receives ENOBUFS.
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The value must be greater than or equal to 0.
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.It Va hw.sfxge.N.max_rss_channels
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The maximum number of allocated RSS channels for the Nth adapter.
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If set to 0 or unset, the number of channels is determined by the number
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of CPU cores.
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.El
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.Sh SUPPORT
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For general information and support,
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go to the Solarflare support website at:
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.Pa https://support.solarflare.com .
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.Sh SEE ALSO
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.Xr cpuset 1 ,
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.Xr arp 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 4 ,
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.Xr vlan 4 ,
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.Xr ifconfig 8
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Philip Paeps
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and
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.An Solarflare Communications, Inc.
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