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freebsd-skq/share/man/man4/cxgbe.4
Navdeep Parhar 46e1e307ed cxgbe(4): Retire the allow_mbufs_in_cluster optimization. 
This simplifies the driver's rx fast path as well as the bookkeeping
code that tracks various rx buffer sizes and layouts.

MFC after:	1 week
Sponsored by:	Chelsio Communications
2020-02-04 00:51:10 +00:00

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.\" Copyright (c) 2011-2016, Chelsio Inc
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright notice,
.\" this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" 3. Neither the name of the Chelsio Inc nor the names of its
.\" contributors may be used to endorse or promote products derived from
.\" this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
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.\" * Other names and brands may be claimed as the property of others.
.\"
.\" $FreeBSD$
.\"
.Dd Dec 10, 2019
.Dt CXGBE 4
.Os
.Sh NAME
.Nm cxgbe
.Nd "Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet adapter driver"
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device cxgbe"
.Ed
.Pp
To load the driver as a
module at boot time, place the following lines in
.Xr loader.conf 5 :
.Bd -literal -offset indent
t4fw_cfg_load="YES"
t5fw_cfg_load="YES"
t6fw_cfg_load="YES"
if_cxgbe_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for PCI Express Ethernet adapters based on
the Chelsio Terminator 4, Terminator 5, and Terminator 6 ASICs (T4, T5, and T6).
The driver supports Jumbo Frames, Transmit/Receive checksum offload,
TCP segmentation offload (TSO), Large Receive Offload (LRO), VLAN
tag insertion/extraction, VLAN checksum offload, VLAN TSO, and
Receive Side Steering (RSS).
For further hardware information and questions related to hardware
requirements, see
.Pa http://www.chelsio.com/ .
.Pp
The
.Nm
driver uses different names for devices based on the associated ASIC:
.Bl -column -offset indent "ASIC" "Port Name" "Parent Device"
.It Sy ASIC Ta Sy Port Name Ta Sy Parent Device Ta Sy Virtual Interface
.It T4 Ta cxgbe Ta t4nex Ta vcxgbe
.It T5 Ta cxl Ta t5nex Ta vcxl
.It T6 Ta cc Ta t6nex Ta vcc
.El
.Pp
Loader tunables with the hw.cxgbe prefix apply to all cards.
The driver provides sysctl MIBs for both ports and parent devices using
the names above.
For example, a T5 adapter provides port MIBs under dev.cxl and
adapter-wide MIBs under dev.t5nex.
References to sysctl MIBs in the remainder of this page use
dev.<port> for port MIBs and dev.<nexus> for adapter-wide MIBs.
.Pp
For more information on configuring this device, see
.Xr ifconfig 8 .
.Sh HARDWARE
The
.Nm
driver supports 100Gb and 25Gb Ethernet adapters based on the T6 ASIC:
.Pp
.Bl -bullet -compact
.It
Chelsio T6225-CR
.It
Chelsio T6225-SO-CR
.It
Chelsio T62100-LP-CR
.It
Chelsio T62100-SO-CR
.It
Chelsio T62100-CR
.El
.Pp
The
.Nm
driver supports 40Gb, 10Gb and 1Gb Ethernet adapters based on the T5 ASIC:
.Pp
.Bl -bullet -compact
.It
Chelsio T580-CR
.It
Chelsio T580-LP-CR
.It
Chelsio T580-LP-SO-CR
.It
Chelsio T560-CR
.It
Chelsio T540-CR
.It
Chelsio T540-LP-CR
.It
Chelsio T522-CR
.It
Chelsio T520-LL-CR
.It
Chelsio T520-CR
.It
Chelsio T520-SO
.It
Chelsio T520-BT
.It
Chelsio T504-BT
.El
.Pp
The
.Nm
driver supports 10Gb and 1Gb Ethernet adapters based on the T4 ASIC:
.Pp
.Bl -bullet -compact
.It
Chelsio T420-CR
.It
Chelsio T422-CR
.It
Chelsio T440-CR
.It
Chelsio T420-BCH
.It
Chelsio T440-BCH
.It
Chelsio T440-CH
.It
Chelsio T420-SO
.It
Chelsio T420-CX
.It
Chelsio T420-BT
.It
Chelsio T404-BT
.El
.Sh LOADER TUNABLES
Tunables can be set at the
.Xr loader 8
prompt before booting the kernel or stored in
.Xr loader.conf 5 .
There are multiple tunables that control the number of queues of various
types.
A negative value for such a tunable instructs the driver to create
up to that many queues if there are enough CPU cores available.
.Bl -tag -width indent
.It Va hw.cxgbe.ntxq
Number of NIC tx queues used for a port.
The default is 16 or the number
of CPU cores in the system, whichever is less.
.It Va hw.cxgbe.nrxq
Number of NIC rx queues used for a port.
The default is 8 or the number
of CPU cores in the system, whichever is less.
.It Va hw.cxgbe.nofldtxq
Number of TOE tx queues used for a port.
The default is 8 or the
number of CPU cores in the system, whichever is less.
.It Va hw.cxgbe.nofldrxq
Number of TOE rx queues used for a port.
The default is 2 or the
number of CPU cores in the system, whichever is less.
.It Va hw.cxgbe.num_vis
Number of virtual interfaces (VIs) created for each port.
Each virtual interface creates a separate network interface.
The first virtual interface on each port is required and represents
the primary network interface on the port.
Additional virtual interfaces on a port are named using the Virtual Interface
name from the table above.
Additional virtual interfaces use a single pair of queues
for rx and tx as well an additional pair of queues for TOE rx and tx.
The default is 1.
.It Va hw.cxgbe.holdoff_timer_idx
.It Va hw.cxgbe.holdoff_timer_idx_ofld
Timer index value used to delay interrupts.
The holdoff timer list has the values 1, 5, 10, 50, 100, and 200
by default (all values are in microseconds) and the index selects a
value from this list.
holdoff_timer_idx_ofld applies to queues used for TOE rx.
The default value is 1 which means the timer value is 5us.
Different interfaces can be assigned different values at any time via the
dev.<port>.X.holdoff_tmr_idx and dev.<port>.X.holdoff_tmr_idx_ofld sysctls.
.It Va hw.cxgbe.holdoff_pktc_idx
.It Va hw.cxgbe.holdoff_pktc_idx_ofld
Packet-count index value used to delay interrupts.
The packet-count list has the values 1, 8, 16, and 32 by default,
and the index selects a value from this list.
holdoff_pktc_idx_ofld applies to queues used for TOE rx.
The default value is -1 which means packet counting is disabled and interrupts
are generated based solely on the holdoff timer value.
Different interfaces can be assigned different values via the
dev.<port>.X.holdoff_pktc_idx and dev.<port>.X.holdoff_pktc_idx_ofld sysctls.
These sysctls work only when the interface has never been marked up (as done by
ifconfig up).
.It Va hw.cxgbe.qsize_txq
Number of entries in a transmit queue's descriptor ring.
A buf_ring of the same size is also allocated for additional
software queuing.
See
.Xr ifnet 9 .
The default value is 1024.
Different interfaces can be assigned different values via the
dev.<port>.X.qsize_txq sysctl.
This sysctl works only when the interface has never been marked up (as done by
ifconfig up).
.It Va hw.cxgbe.qsize_rxq
Number of entries in a receive queue's descriptor ring.
The default value is 1024.
Different interfaces can be assigned different values via the
dev.<port>.X.qsize_rxq sysctl.
This sysctl works only when the interface has never been marked up (as done by
ifconfig up).
.It Va hw.cxgbe.interrupt_types
Permitted interrupt types.
Bit 0 represents INTx (line interrupts), bit 1 MSI, and bit 2 MSI-X.
The default is 7 (all allowed).
The driver selects the best possible type out of the allowed types.
.It Va hw.cxgbe.pcie_relaxed_ordering
PCIe Relaxed Ordering.
-1 indicates the driver should determine whether to enable or disable PCIe RO.
0 disables PCIe RO.
1 enables PCIe RO.
2 indicates the driver should not modify the PCIe RO setting.
The default is -1.
.It Va hw.cxgbe.fw_install
0 prohibits the driver from installing a firmware on the card.
1 allows the driver to install a new firmware if internal driver
heuristics indicate that the new firmware is preferable to the one
already on the card.
2 instructs the driver to always install the new firmware on the card as
long as it is compatible with the driver and is a different version than
the one already on the card.
The default is 1.
.It Va hw.cxgbe.fl_pktshift
Number of padding bytes inserted before the beginning of an Ethernet
frame in the receive buffer.
The default value is 0.
A value of of 2 would ensure that the Ethernet payload (usually the IP header)
is at a 4 byte aligned address.
0-7 are all valid values.
.It Va hw.cxgbe.fl_pad
A non-zero value ensures that writes from the hardware to a receive buffer are
padded up to the specified boundary.
The default is -1 which lets the driver pick a pad boundary.
0 disables trailer padding completely.
.It Va hw.cxgbe.cong_drop
Controls the hardware response to congestion.
-1 disables congestion feedback and is not recommended.
0 instructs the hardware to backpressure its pipeline on congestion.
This usually results in the port emitting PAUSE frames.
1 instructs the hardware to drop frames destined for congested queues.
.It Va hw.cxgbe.pause_settings
PAUSE frame settings.
Bit 0 is rx_pause, bit 1 is tx_pause, bit 2 is pause_autoneg.
rx_pause = 1 instructs the hardware to heed incoming PAUSE frames, 0 instructs
it to ignore them.
tx_pause = 1 allows the hardware to emit PAUSE frames when its receive FIFO
reaches a high threshold, 0 prohibits the hardware from emitting PAUSE frames.
pause_autoneg = 1 overrides the rx_pause and tx_pause bits and instructs the
hardware to negotiate PAUSE settings with the link peer.
The default is 7 (all three = 1).
This tunable establishes the default PAUSE settings for all ports.
Settings can be displayed and controlled on a per-port basis via the
dev.<port>.X.pause_settings sysctl.
.It Va hw.cxgbe.fec
Forward Error Correction settings.
-1 (default) means driver should automatically pick a value.
0 disables FEC.
Finer grained control can be achieved by setting individual bits.
Bit 0 enables RS FEC, bit 1 enables BASE-R FEC (aka Firecode FEC), bit
2 enables NO FEC, and bit 6 enables the FEC that is recommended by the
transceiver/cable that is plugged in.
These bits can be set together in any combination.
This tunable establishes the default FEC settings for all ports.
Settings can be displayed and controlled on a per-port basis via the
dev.<port>.X.fec sysctl.
.It Va hw.cxgbe.autoneg
Link autonegotiation settings.
This tunable establishes the default autonegotiation settings for all ports.
Settings can be displayed and controlled on a per-port basis via the
dev.<port>.X.autoneg sysctl.
0 disables autonegotiation.
1 enables autonegotiation.
The default is -1 which lets the driver pick a value.
dev.<port>.X.autoneg is -1 for port and module combinations that do not support
autonegotiation.
.It Va hw.cxgbe.buffer_packing
Allow the hardware to deliver multiple frames in the same receive buffer
opportunistically.
The default is -1 which lets the driver decide.
0 or 1 explicitly disable or enable this feature.
.It Va hw.cxgbe.largest_rx_cluster
.It Va hw.cxgbe.safest_rx_cluster
Sizes of rx clusters.
Each of these must be set to one of the sizes available
(usually 2048, 4096, 9216, and 16384) and largest_rx_cluster must be greater
than or equal to safest_rx_cluster.
The defaults are 16384 and 4096 respectively.
The driver never attempts to allocate a receive buffer larger than
largest_rx_cluster and falls back to allocating buffers of
safest_rx_cluster size if an allocation larger than safest_rx_cluster fails.
Note that largest_rx_cluster merely establishes a ceiling -- the driver is
allowed to allocate buffers of smaller sizes.
.It Va hw.cxgbe.config_file
Select a pre-packaged device configuration file.
A configuration file contains a recipe for partitioning and configuring the
hardware resources on the card.
This tunable is for specialized applications only and should not be used in
normal operation.
The configuration profile currently in use is available in the dev.<nexus>.X.cf
and dev.<nexus>.X.cfcsum sysctls.
.It Va hw.cxgbe.linkcaps_allowed
.It Va hw.cxgbe.niccaps_allowed
.It Va hw.cxgbe.toecaps_allowed
.It Va hw.cxgbe.rdmacaps_allowed
.It Va hw.cxgbe.iscsicaps_allowed
.It Va hw.cxgbe.fcoecaps_allowed
Disallowing capabilities provides a hint to the driver and firmware to not
reserve hardware resources for that feature.
Each of these is a bit field with a bit for each sub-capability within the
capability.
This tunable is for specialized applications only and should not be used in
normal operation.
The capabilities for which hardware resources have been reserved are listed in
dev.<nexus>.X.*caps sysctls.
.El
.Sh SUPPORT
For general information and support,
go to the Chelsio support website at:
.Pa http://www.chelsio.com/ .
.Pp
If an issue is identified with this driver with a supported adapter,
email all the specific information related to the issue to
.Aq Mt support@chelsio.com .
.Sh SEE ALSO
.Xr altq 4 ,
.Xr arp 4 ,
.Xr ccr 4 ,
.Xr cxgb 4 ,
.Xr cxgbev 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 9.0 .
Support for T5 cards first appeared in
.Fx 9.2
and
.Fx 10.0 .
Support for T6 cards first appeared in
.Fx 11.1
and
.Fx 12.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Navdeep Parhar Aq Mt np@FreeBSD.org .
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