NAME¶
cxgbe
—
Chelsio T4 and T5 based 40Gb, 10Gb, and 1Gb Ethernet
adapter driver
SYNOPSIS¶
To compile this driver into the kernel, place the following lines in your kernel
configuration file:
device cxgbe
To load the driver as a module at boot time, place the following lines in
loader.conf(5):
t4fw_cfg_load="YES"
t5fw_cfg_load="YES"
if_cxgbe_load="YES"
DESCRIPTION¶
The
cxgbe
driver provides support for PCI
Express Ethernet adapters based on the Chelsio Terminator 4 and Terminator 5
ASICs (T4 and T5). 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
http://www.chelsio.com/.
Note that ports of T5 cards are named cxl and attach to a t5nex parent device
(in contrast to ports named cxgbe that attach to a t4nex parent for a T4
card). Loader tunables with the hw.cxgbe prefix apply to both T4 and T5 cards.
The sysctl MIBs are at dev.t5nex and dev.cxl for T5 cards and at dev.t4nex and
dev.cxgbe for T4 cards.
For more information on configuring this device, see
ifconfig(8).
HARDWARE¶
The
cxgbe
driver supports 40Gb, 10Gb and 1Gb
Ethernet adapters based on the T5 ASIC (ports will be named cxl):
- Chelsio T580-CR
- Chelsio T580-LP-CR
- Chelsio T580-LP-SO-CR
- Chelsio T560-CR
- Chelsio T540-CR
- Chelsio T540-LP-CR
- Chelsio T522-CR
- Chelsio T520-LL-CR
- Chelsio T520-CR
- Chelsio T520-SO
- Chelsio T520-BT
- Chelsio T504-BT
The
cxgbe
driver supports 10Gb and 1Gb
Ethernet adapters based on the T4 ASIC:
- Chelsio T420-CR
- Chelsio T422-CR
- Chelsio T440-CR
- Chelsio T420-BCH
- Chelsio T440-BCH
- Chelsio T440-CH
- Chelsio T420-SO
- Chelsio T420-CX
- Chelsio T420-BT
- Chelsio T404-BT
LOADER TUNABLES¶
Tunables can be set at the
loader(8) prompt before
booting the kernel or stored in
loader.conf(5).
- hw.cxgbe.ntxq10g
- The number of tx queues to use for a 10Gb or 40Gb port. The default is 16
or the number of CPU cores in the system, whichever is less.
- hw.cxgbe.nrxq10g
- The number of rx queues to use for a 10Gb or 40Gb port. The default is 8
or the number of CPU cores in the system, whichever is less.
- hw.cxgbe.ntxq1g
- The number of tx queues to use for a 1Gb port. The default is 4 or the
number of CPU cores in the system, whichever is less.
- hw.cxgbe.nrxq1g
- The number of rx queues to use for a 1Gb port. The default is 2 or the
number of CPU cores in the system, whichever is less.
- hw.cxgbe.nofldtxq10g
- The number of TOE tx queues to use for a 10Gb or 40Gb port. The default is
8 or the number of CPU cores in the system, whichever is less.
- hw.cxgbe.nofldrxq10g
- The number of TOE rx queues to use for a 10Gb or 40Gb port. The default is
2 or the number of CPU cores in the system, whichever is less.
- hw.cxgbe.nofldtxq1g
- The number of TOE tx queues to use for a 1Gb port. The default is 2 or the
number of CPU cores in the system, whichever is less.
- hw.cxgbe.nofldrxq1g
- The number of TOE rx queues to use for a 1Gb port. The default is 1.
- hw.cxgbe.holdoff_timer_idx_10G
-
- hw.cxgbe.holdoff_timer_idx_1G
- The timer index value to use 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. 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.cxgbe.X.holdoff_tmr_idx
or dev.cxl.X.holdoff_tmr_idx sysctl.
- hw.cxgbe.holdoff_pktc_idx_10G
-
- hw.cxgbe.holdoff_pktc_idx_1G
- The packet-count index value to use 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. 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.cxgbe.X.holdoff_pktc_idx or dev.cxl.X.holdoff_pktc_idx sysctl. This
sysctl works only when the interface has never been marked up (as done by
ifconfig up).
- hw.cxgbe.qsize_txq
- The size, in number of entries, of the descriptor ring used for a tx
queue. A buf_ring of the same size is also allocated for additional
software queuing. See ifnet(9). The default
value is 1024. Different interfaces can be assigned different values via
the dev.cxgbe.X.qsize_txq sysctl or dev.cxl.X.qsize_txq sysctl. This
sysctl works only when the interface has never been marked up (as done by
ifconfig up).
- hw.cxgbe.qsize_rxq
- The size, in number of entries, of the descriptor ring used for an rx
queue. The default value is 1024. Different interfaces can be assigned
different values via the dev.cxgbe.X.qsize_rxq or dev.cxl.X.qsize_rxq
sysctl. This sysctl works only when the interface has never been marked up
(as done by ifconfig up).
- hw.cxgbe.interrupt_types
- The interrupt types that the driver is allowed to use. Bit 0 represents
INTx (line interrupts), bit 1 MSI, bit 2 MSI-X. The default is 7 (all
allowed). The driver will select the best possible type out of the allowed
types by itself.
- 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.
- hw.cxgbe.fl_pktshift
- The number of bytes of padding inserted before the begining of an Ethernet
frame in the receive buffer. The default value of 2 ensures that the
Ethernet payload (usually the IP header) is at a 4 byte aligned address.
0-7 are all valid values.
- 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.
- 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.
- hw.cxgbe.pause_settings
- PAUSE frame settings. Bit 0 is rx_pause, bit 1 is tx_pause. 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. The default is 3 (both rx_pause and tx_pause = 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.cxgbe.X.pause_settings (dev.cxl.X.pause_settings for T5 cards)
sysctl.
- 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.
- hw.cxgbe.allow_mbufs_in_cluster
- 1 allows the driver to lay down one or more mbufs within the receive
buffer opportunistically. This is the default. 0 prohibits the driver from
doing so.
- hw.cxgbe.largest_rx_cluster
-
- 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 will never attempt to allocate a receive
buffer larger than largest_rx_cluster and will fall 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.
- 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.t4nex.X.cf and dev.t4nex.X.cfcsum (dev.t5nex
for T5 cards) sysctls.
- hw.cxgbe.linkcaps_allowed
-
- hw.cxgbe.niccaps_allowed
-
- hw.cxgbe.toecaps_allowed
-
- hw.cxgbe.rdmacaps_allowed
-
- hw.cxgbe.iscsicaps_allowed
-
- 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.t4nex.X.*caps or dev.t5nex.X.*caps
sysctls.
SUPPORT¶
For general information and support, go to the Chelsio support website at:
http://www.chelsio.com/.
If an issue is identified with this driver with a supported adapter, email all
the specific information related to the issue to
⟨support@chelsio.com⟩.
SEE ALSO¶
altq(4),
arp(4),
cxgb(4),
netintro(4),
ng_ether(4),
ifconfig(8)
HISTORY¶
The
cxgbe
device driver first appeared in
FreeBSD 9.0. Support for T5 cards first appeared in
FreeBSD 9.2 and
FreeBSD 10.0.
AUTHORS¶
The
cxgbe
driver was written by
Navdeep Parhar
⟨np@FreeBSD.org⟩.