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up to 2 rx/tx queues for the 82574. Program the 82574 to enable 5 msix vectors, assign 1 to each rx queue, 1 to each tx queue and 1 to the link handler. Inspired by DragonFlyBSD, enable some RSS logic for handling tx queue handling/processing. Move multiqueue handler functions so that they line up better in a diff review to if_igb.c Always enqueue tx work to be done in em_mq_start, if unable to acquire the TX lock, then this will be processed in the background later by the taskqueue. Remove mbuf argument from em_start_mq_locked() as the work is always enqueued. (stolen from igb) Setup TARC, TXDCTL and RXDCTL registers for better performance and stability in multiqueue and singlequeue implementations. Handle Intel errata 3 and generic multiqueue behavior with the initialization of TARC(0) and TARC(1) Bind interrupt threads to cpus in order. (stolen from igb) Add 2 new DDB functions, one to display the queue(s) and their settings and one to reset the adapter. Primarily used for debugging. In the multiqueue configuration, bump RXD and TXD ring size to max for the adapter (4096). Setup an RDTR of 64 and an RADV of 128 in multiqueue configuration to cut down on the number of interrupts. RADV was arbitrarily set to 2x RDTR and can be adjusted as needed. Cleanup the display in top a bit to make it clearer where the taskqueue threads are running and what they should be doing. Ensure that both queues are processed by em_local_timer() by writing them both to the IMS register to generate soft interrupts. Ensure that an soft interrupt is generated when em_msix_link() is run so that any races between assertion of the link/status interrupt and a rx/tx interrupt are handled. Document existing tuneables: hw.em.eee_setting, hw.em.msix, hw.em.smart_pwr_down, hw.em.sbp Document use of hw.em.num_queues and the new kernel option EM_MULTIQUEUE Thanks to Intel for their continued support of FreeBSD. Reviewed by: erj jfv hiren gnn wblock Obtained from: Intel Corporation MFC after: 2 weeks Relnotes: Yes Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D1994
317 lines
8.9 KiB
Groff
317 lines
8.9 KiB
Groff
.\" Copyright (c) 2001-2003, Intel Corporation
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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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.\"
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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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.\" 3. Neither the name of the Intel Corporation nor the names of its
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.\" contributors may be used to endorse or promote products derived from
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.\" this software without specific prior written permission.
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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, 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" * Other names and brands may be claimed as the property of others.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 11, 2011
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.Dt EM 4
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.Os
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.Sh NAME
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.Nm em
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.Nd "Intel(R) PRO/1000 Gigabit 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 line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device em"
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.Ed
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.Pp
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Optional multiqueue support is available via the following kernel
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compile options:
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.Bd -ragged -offset indent
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.Cd "options EM_MULTIQUEUE"
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.Ed
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.Pp
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Note: Activating EM_MULTIQUEUE support is not supported by Intel.
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.Pp
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Alternatively, 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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if_em_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 PCI Gigabit Ethernet adapters based on
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the Intel 82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546,
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82546EB, 82546GB, 82547, 82571, 81572, 82573, and 82574 Ethernet
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controller chips.
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The driver supports Transmit/Receive checksum offload
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and Jumbo Frames on all but 82542-based adapters.
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Furthermore it supports TCP segmentation offload (TSO) on all adapters but
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those based on the 82543, 82544 and 82547 controller chips.
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The identification LEDs of the adapters supported by the
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.Nm
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driver can be controlled via the
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.Xr led 4
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API for localization purposes.
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For further hardware information, see the
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.Pa README
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included with the driver.
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.Pp
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For questions related to hardware requirements,
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refer to the documentation supplied with your Intel PRO/1000 adapter.
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All hardware requirements listed apply to use with
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.Fx .
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.Pp
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Support for Jumbo Frames is provided via the interface MTU setting.
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Selecting an MTU larger than 1500 bytes with the
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.Xr ifconfig 8
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utility configures the adapter to receive and transmit Jumbo Frames.
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The maximum MTU size for Jumbo Frames is 16114.
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.Pp
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This driver version supports VLANs.
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The
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.Nm
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driver supports the following media types:
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.Bl -tag -width ".Cm 10baseT/UTP"
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.It Cm autoselect
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Enables auto-negotiation for speed and duplex.
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.It Cm 10baseT/UTP
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Sets 10Mbps operation.
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Use the
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.Cm mediaopt
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option to select
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.Cm full-duplex
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mode.
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.It Cm 100baseTX
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Sets 100Mbps operation.
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Use the
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.Cm mediaopt
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option to select
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.Cm full-duplex
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mode.
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.It Cm 1000baseSX
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Sets 1000Mbps operation.
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Only
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.Cm full-duplex
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mode is supported at this speed.
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.It Cm 1000baseTX
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Sets 1000Mbps operation.
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Only
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.Cm full-duplex
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mode is supported at this speed.
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.El
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.Pp
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The
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.Nm
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driver supports the following media options:
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.Bl -tag -width ".Cm full-duplex"
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.It Cm full-duplex
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Forces full-duplex operation
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.It Cm half-duplex
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Forces half-duplex operation.
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.El
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.Pp
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Only use
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.Cm mediaopt
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to set the driver to
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.Cm full-duplex .
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If
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.Cm mediaopt
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is not specified, the driver defaults to
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.Cm half-duplex .
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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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.Sh HARDWARE
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The
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.Nm
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driver supports Gigabit Ethernet adapters based on the Intel
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82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546, 82546EB,
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82546GB, 82547, 82571, 82572, 82573, and 82574 controller chips:
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.Pp
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.Bl -bullet -compact
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.It
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Intel PRO/1000 CT Network Connection (82547)
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.It
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Intel PRO/1000 F Server Adapter (82543)
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.It
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Intel PRO/1000 Gigabit Server Adapter (82542)
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.It
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Intel PRO/1000 GT Desktop Adapter (82541PI)
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.It
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Intel PRO/1000 MF Dual Port Server Adapter (82546)
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.It
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Intel PRO/1000 MF Server Adapter (82545)
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.It
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Intel PRO/1000 MF Server Adapter (LX) (82545)
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.It
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Intel PRO/1000 MT Desktop Adapter (82540)
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.It
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Intel PRO/1000 MT Desktop Adapter (82541)
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.It
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Intel PRO/1000 MT Dual Port Server Adapter (82546)
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.It
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Intel PRO/1000 MT Quad Port Server Adapter (82546EB)
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.It
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Intel PRO/1000 MT Server Adapter (82545)
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.It
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Intel PRO/1000 PF Dual Port Server Adapter (82571)
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.It
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Intel PRO/1000 PF Quad Port Server Adapter (82571)
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.It
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Intel PRO/1000 PF Server Adapter (82572)
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.It
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Intel PRO/1000 PT Desktop Adapter (82572)
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.It
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Intel PRO/1000 PT Dual Port Server Adapter (82571)
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.It
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Intel PRO/1000 PT Quad Port Server Adapter (82571)
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.It
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Intel PRO/1000 PT Server Adapter (82572)
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.It
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Intel PRO/1000 T Desktop Adapter (82544)
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.It
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Intel PRO/1000 T Server Adapter (82543)
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.It
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Intel PRO/1000 XF Server Adapter (82544)
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.It
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Intel PRO/1000 XT Server Adapter (82544)
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.El
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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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.Bl -tag -width indent
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.It Va hw.em.eee_setting
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Disable or enable Energy Efficient Ethernet.
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Default 1 (disabled).
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.It Va hw.em.msix
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Enable or disable MSI-X style interrupts.
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Default 1 (enabled).
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.It Va hw.em.smart_pwr_down
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Enable or disable smart power down features on newer adapters.
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Default 0 (disabled).
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.It Va hw.em.sbp
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Show bad packets when in promiscuous mode.
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Default 0 (off).
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.It Va hw.em.rxd
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Number of receive descriptors allocated by the driver.
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The default value is 1024 for adapters newer than 82547,
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and 256 for older ones.
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The 82542 and 82543-based adapters can handle up to 256 descriptors,
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while others can have up to 4096.
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.It Va hw.em.txd
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Number of transmit descriptors allocated by the driver.
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The default value is 1024 for adapters newer than 82547,
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and 256 for older ones.
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The 82542 and 82543-based adapters can handle up to 256 descriptors,
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while others can have up to 4096.
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.It Va hw.em.rx_int_delay
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This value delays the generation of receive interrupts in units of
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1.024 microseconds.
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The default value is 0, since adapters may hang with this feature
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being enabled.
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.It Va hw.em.rx_abs_int_delay
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If
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.Va hw.em.rx_int_delay
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is non-zero, this tunable limits the maximum delay in which a receive
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interrupt is generated.
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.It Va hw.em.tx_int_delay
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This value delays the generation of transmit interrupts in units of
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1.024 microseconds.
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The default value is 64.
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.It Va hw.em.tx_abs_int_delay
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If
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.Va hw.em.tx_int_delay
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is non-zero, this tunable limits the maximum delay in which a transmit
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interrupt is generated.
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.It Va hw.em.num_queues
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Number of hardware queues that will be configured on this adapter (maximum of 2)
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Defaults to 1.
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Only valid with kernel configuration
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.Cd "options EM_MULTIQUEUE".
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.El
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.Sh FILES
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.Bl -tag -width /dev/led/em*
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.It Pa /dev/led/em*
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identification LED device nodes
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.El
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.Sh EXAMPLES
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Make the identification LED of em0 blink:
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.Pp
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.Dl "echo f2 > /dev/led/em0"
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.Pp
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Turn the identification LED of em0 off again:
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.Pp
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.Dl "echo 0 > /dev/led/em0"
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "em%d: Unable to allocate bus resource: memory"
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A fatal initialization error has occurred.
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.It "em%d: Unable to allocate bus resource: interrupt"
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A fatal initialization error has occurred.
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.It "em%d: watchdog timeout -- resetting"
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The device has stopped responding to the network, or there is a problem with
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the network connection (cable).
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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 Intel support website at:
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.Pa http://support.intel.com .
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.Pp
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If an issue is identified with the released source code on the supported kernel
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with a supported adapter, email the specific information related to the
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issue to
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.Aq Mt freebsd@intel.com .
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.Sh SEE ALSO
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.Xr altq 4 ,
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.Xr arp 4 ,
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.Xr igb 4 ,
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.Xr led 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 4 ,
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.Xr polling 4 ,
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.Xr vlan 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 4.4 .
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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 Intel Corporation Aq Mt freebsd@intel.com .
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.Sh BUGS
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Hardware-assisted VLAN processing is disabled by default.
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You can enable it on an
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.Nm
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interface using
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.Xr ifconfig 8 .
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.Pp
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Activating EM_MULTIQUEUE support requires MSI-X features.
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