180 lines
6.5 KiB
Groff
180 lines
6.5 KiB
Groff
.\" Copyright (c) 2011-2016 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 are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright notice,
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.\" this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright notice,
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.\" this list of conditions and the following disclaimer in the documentation
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.\" and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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.\" THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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.\" CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" The views and conclusions contained in the software and documentation are
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.\" those of the authors and should not be interpreted as representing official
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.\" policies, either expressed or implied, of the FreeBSD Project.
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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.tso_fw_assisted
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Bitmask to enable/disable usage of FW-assisted TSO version if supported
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by NIC firmware.
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FATSOv1 (bit 0) and FATSOv2 (bit 1) are supported.
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All enabled by default.
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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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.It Va hw.sfxge.lro.table_size
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Size of the LRO hash table.
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Must be a power of 2.
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A larger table means we can accelerate a larger number of streams.
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.It Va hw.sfxge.lro.chain_max
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The maximum length of a hash chain.
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If chains get too long then the lookup time increases and may exceed
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the benefit of LRO.
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.It Va hw.sfxge.lro.idle_ticks
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The maximum time (in ticks) that a connection can be idle before it's LRO
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state is discarded.
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.It Va hw.sfxge.lro.slow_start_packets
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Number of packets with payload that must arrive in-order before a connection
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is eligible for LRO.
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The idea is we should avoid coalescing segments when the sender is in
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slow-start because reducing the ACK rate can damage performance.
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.It Va hw.sfxge.lro.loss_packets
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Number of packets with payload that must arrive in-order following loss
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before a connection is eligible for LRO.
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The idea is we should avoid coalescing segments when the sender is recovering
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from loss, because reducing the ACK rate can damage performance.
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.It Va hw.sfxge.mcdi_logging
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Enable logging of MCDI protocol messages (only available if enabled at compile-time).
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.It Va hw.sfxge.N.mcdi_logging
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Enable or disable logging of MCDI protocol messages on a per-port basis.
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The default for each port will be the value of
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.Va hw.sfxge.mcdi_logging.
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The logging may also be enabled or disabled after the driver is loaded using the sysctl
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.Va dev.sfxge.%d.mcdi_logging.
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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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