6af45170c1
The cxgbev/cxlv driver supports Virtual Function devices for Chelsio T4 and T4 adapters. The VF devices share most of their code with the existing PF4 driver (cxgbe/cxl) and as such the VF device driver currently depends on the PF4 driver. Similar to the cxgbe/cxl drivers, the VF driver includes a t4vf/t5vf PCI device driver that attaches to the VF device. It then creates child cxgbev/cxlv devices representing ports assigned to the VF. By default, the PF driver assigns a single port to each VF. t4vf_hw.c contains VF-specific routines from the shared code used to fetch VF-specific parameters from the firmware. t4_vf.c contains the VF-specific PCI device driver and includes its own attach routine. VF devices are required to use a different firmware request when transmitting packets (which in turn requires a different CPL message to encapsulate messages). This alternate firmware request does not permit chaining multiple packets in a single message, so each packet results in a firmware request. In addition, the different CPL message requires more detailed information when enabling hardware checksums, so parse_pkt() on VF devices must examine L2 and L3 headers for all packets (not just TSO packets) for VF devices. Finally, L2 checksums on non-UDP/non-TCP packets do not work reliably (the firmware trashes the IPv4 fragment field), so IPv4 checksums for such packets are calculated in software. Most of the other changes in the non-VF-specific code are to expose various variables and functions private to the PF driver so that they can be used by the VF driver. Note that a limited subset of cxgbetool functions are supported on VF devices including register dumps, scheduler classes, and clearing of statistics. In addition, TOE is not supported on VF devices, only for the PF interfaces. Reviewed by: np MFC after: 2 months Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D7599
291 lines
9.6 KiB
Groff
291 lines
9.6 KiB
Groff
.\" Copyright (c) 2011-2016, Chelsio 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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.\"
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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 Chelsio Inc 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 August 22, 2016
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.Dt CXGBEV 4
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.Os
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.Sh NAME
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.Nm cxgbev
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.Nd "Chelsio T4 and T5 based 40Gb, 10Gb, and 1Gb Ethernet VF 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 cxgbe"
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.Cd "device cxgbev"
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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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if_cxgbev_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 Virtual Functions on PCI Express Ethernet adapters
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based on the Chelsio Terminator 4 and Terminator 5 ASICs (T4 and T5).
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The driver supports Jumbo Frames, Transmit/Receive checksum offload,
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TCP segmentation offload (TSO), Large Receive Offload (LRO), VLAN
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tag insertion/extraction, VLAN checksum offload, VLAN TSO, and
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Receive Side Steering (RSS).
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For further hardware information and questions related to hardware
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requirements, see
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.Pa http://www.chelsio.com/ .
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.Pp
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Note that ports of T5 VFs are named cxlv and attach to a t5vf parent device
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(in contrast to ports named cxgbev that attach to a t4vf parent for a T4 VF).
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Loader tunables with the hw.cxgbe prefix apply to both T4 and T5 VFs.
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The Physical Function driver for T4 and T5 adapters shares these tunables.
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The sysctl MIBs are at dev.t5vf and dev.cxlv for T5 cards and at dev.t4vf and
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dev.cxgbev for T4 cards.
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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 Virtual Functions on 40Gb, 10Gb and 1Gb Ethernet adapters
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based on the T5 ASIC:
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.Pp
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.Bl -bullet -compact
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.It
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Chelsio T580-CR
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.It
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Chelsio T580-LP-CR
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.It
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Chelsio T580-LP-SO-CR
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.It
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Chelsio T560-CR
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.It
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Chelsio T540-CR
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.It
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Chelsio T540-LP-CR
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.It
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Chelsio T522-CR
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.It
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Chelsio T520-LL-CR
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.It
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Chelsio T520-CR
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.It
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Chelsio T520-SO
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.It
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Chelsio T520-BT
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.It
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Chelsio T504-BT
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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 Virtual Functions on 10Gb and 1Gb Ethernet adapters based
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on the T4 ASIC:
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.Pp
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.Bl -bullet -compact
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.It
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Chelsio T420-CR
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.It
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Chelsio T422-CR
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.It
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Chelsio T440-CR
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.It
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Chelsio T420-BCH
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.It
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Chelsio T440-BCH
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.It
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Chelsio T440-CH
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.It
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Chelsio T420-SO
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.It
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Chelsio T420-CX
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.It
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Chelsio T420-BT
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.It
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Chelsio T404-BT
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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.cxgbe.ntxq10g
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The number of tx queues to use for a 10Gb or 40Gb port.
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The default is 16 or the number
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of CPU cores in the system, whichever is less.
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.It Va hw.cxgbe.nrxq10g
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The number of rx queues to use for a 10Gb or 40Gb port.
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The default is 8 or the number
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of CPU cores in the system, whichever is less.
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.It Va hw.cxgbe.ntxq1g
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The number of tx queues to use for a 1Gb port.
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The default is 4 or the number
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of CPU cores in the system, whichever is less.
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.It Va hw.cxgbe.nrxq1g
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The number of rx queues to use for a 1Gb port.
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The default is 2 or the number
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of CPU cores in the system, whichever is less.
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.It Va hw.cxgbe.holdoff_timer_idx_10G
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.It Va hw.cxgbe.holdoff_timer_idx_1G
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The timer index value to use to delay interrupts.
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The holdoff timer list has the values 1, 5, 10, 50, 100, and 200
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by default (all values are in microseconds) and the index selects a
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value from this list.
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The default value is 1 which means the timer value is 5us.
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Different interfaces can be assigned different values at any time via the
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dev.cxgbev.X.holdoff_tmr_idx or dev.cxlv.X.holdoff_tmr_idx sysctl.
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.It Va hw.cxgbe.holdoff_pktc_idx_10G
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.It Va hw.cxgbe.holdoff_pktc_idx_1G
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The packet-count index value to use to delay interrupts.
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The packet-count list has the values 1, 8, 16, and 32 by default
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and the index selects a value from this list.
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The default value is -1 which means packet counting is disabled and interrupts
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are generated based solely on the holdoff timer value.
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Different interfaces can be assigned different values via the
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dev.cxgbev.X.holdoff_pktc_idx or dev.cxlv.X.holdoff_pktc_idx sysctl.
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This sysctl works only when the interface has never been marked up (as done by
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ifconfig up).
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.It Va hw.cxgbe.qsize_txq
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The size, in number of entries, of the descriptor ring used for a tx
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queue.
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A buf_ring of the same size is also allocated for additional
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software queuing.
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See
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.Xr ifnet 9 .
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The default value is 1024.
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Different interfaces can be assigned different values via the
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dev.cxgbev.X.qsize_txq sysctl or dev.cxlv.X.qsize_txq sysctl.
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This sysctl works only when the interface has never been marked up (as done by
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ifconfig up).
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.It Va hw.cxgbe.qsize_rxq
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The size, in number of entries, of the descriptor ring used for an
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rx queue.
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The default value is 1024.
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Different interfaces can be assigned different values via the
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dev.cxgbev.X.qsize_rxq or dev.cxlv.X.qsize_rxq sysctl.
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This sysctl works only when the interface has never been marked up (as done by
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ifconfig up).
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.It Va hw.cxgbe.interrupt_types
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The interrupt types that the driver is allowed to use.
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Bit 0 represents INTx (line interrupts), bit 1 MSI, bit 2 MSI-X.
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The default is 7 (all allowed).
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The driver will select the best possible type out of the allowed types by
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itself.
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.It Va hw.cxgbe.fl_pktshift
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The number of bytes of padding inserted before the beginning of an Ethernet
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frame in the receive buffer.
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The default value of 2 ensures that the Ethernet payload (usually the IP header)
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is at a 4 byte aligned address.
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0-7 are all valid values.
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.It Va hw.cxgbe.fl_pad
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A non-zero value ensures that writes from the hardware to a receive buffer are
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padded up to the specified boundary.
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The default is -1 which lets the driver pick a pad boundary.
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0 disables trailer padding completely.
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.It Va hw.cxgbe.buffer_packing
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Allow the hardware to deliver multiple frames in the same receive buffer
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opportunistically.
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The default is -1 which lets the driver decide.
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0 or 1 explicitly disable or enable this feature.
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.It Va hw.cxgbe.allow_mbufs_in_cluster
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1 allows the driver to lay down one or more mbufs within the receive buffer
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opportunistically.
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This is the default.
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0 prohibits the driver from doing so.
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.It Va hw.cxgbe.largest_rx_cluster
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.It Va hw.cxgbe.safest_rx_cluster
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Sizes of rx clusters.
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Each of these must be set to one of the sizes available
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(usually 2048, 4096, 9216, and 16384) and largest_rx_cluster must be greater
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than or equal to safest_rx_cluster.
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The defaults are 16384 and 4096 respectively.
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The driver will never attempt to allocate a receive buffer larger than
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largest_rx_cluster and will fall back to allocating buffers of
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safest_rx_cluster size if an allocation larger than safest_rx_cluster fails.
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Note that largest_rx_cluster merely establishes a ceiling -- the driver is
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allowed to allocate buffers of smaller sizes.
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.El
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.Pp
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Certain settings and resources for Virtual Functions are dictated
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by the parent Physical Function driver.
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For example, the Physical Function driver limits the number of queues a
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Virtual Function is permitted to use.
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Some of these limits can be adjusted in the firmware configuration file
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used with the Physical Function driver.
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.Pp
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The PAUSE settings on the port of a Virtual Function are inherited from
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the settings of the same port on the Physical Function.
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Virtual Functions cannot modify the setting and track changes made to
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the associated port's setting by the Physical Function driver.
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.Pp
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Receive queues on a Virtual Function always drop packets in response to
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congestion
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.Po
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equivalent to setting
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.Va hw.cxgbe.cong_drop
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to 1
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.Pc .
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.Pp
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The VF driver currently depends on the PF driver.
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As a result, loading the VF driver will also load the PF driver as a
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dependency.
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.Sh SUPPORT
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For general information and support,
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go to the Chelsio support website at:
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.Pa http://www.chelsio.com/ .
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.Pp
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If an issue is identified with this driver with a supported adapter,
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email all the specific information related to the issue to
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.Aq Mt support@chelsio.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 cxgbe 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 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 12.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Navdeep Parhar Aq Mt np@FreeBSD.org
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and
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.An John Baldwin Aq Mt jhb@FreeBSD.org .
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