Index: head/share/man/man4/cxgbe.4 =================================================================== --- head/share/man/man4/cxgbe.4 (revision 310423) +++ head/share/man/man4/cxgbe.4 (revision 310424) @@ -1,374 +1,371 @@ .\" 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 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE .\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS .\" 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. .\" .\" * Other names and brands may be claimed as the property of others. .\" .\" $FreeBSD$ .\" -.Dd December 5, 2016 +.Dd December 22, 2016 .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 will provide port MIBs under dev.cxl and +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 will use +References to sysctl MIBs in the remainder of this page use dev. for port MIBs and dev. 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 . .Bl -tag -width indent .It Va hw.cxgbe.ntxq10g -The number of tx queues to use for a 10Gb or higher-speed port. +Number of tx queues used for a 10Gb or higher-speed port. The default is 16 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nrxq10g -The number of rx queues to use for a 10Gb or higher-speed port. +Number of rx queues used for a 10Gb or higher-speed port. The default is 8 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.ntxq1g -The number of tx queues to use for a 1Gb port. +Number of tx queues used for a 1Gb port. The default is 4 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nrxq1g -The number of rx queues to use for a 1Gb port. +Number of rx queues used for a 1Gb port. The default is 2 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nofldtxq10g -The number of TOE tx queues to use for a 10Gb or higher-speed port. +Number of TOE tx queues used for a 10Gb or higher-speed port. The default is 8 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nofldrxq10g -The number of TOE rx queues to use for a 10Gb or higher-speed port. +Number of TOE rx queues used for a 10Gb or higher-speed port. The default is 2 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nofldtxq1g -The number of TOE tx queues to use for a 1Gb port. +Number of TOE tx queues used for a 1Gb port. The default is 2 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nofldrxq1g -The number of TOE rx queues to use for a 1Gb port. +Number of TOE rx queues used for a 1Gb port. The default is 1. .It Va hw.cxgbe.num_vis -The number of virtual interfaces (VIs) created for each port. +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_10G .It Va hw.cxgbe.holdoff_timer_idx_1G -The timer index value to use to delay interrupts. +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. 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..X.holdoff_tmr_idx sysctl. .It Va hw.cxgbe.holdoff_pktc_idx_10G .It Va 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 +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. 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..X.holdoff_pktc_idx sysctl. This sysctl works only when the interface has never been marked up (as done by ifconfig up). .It Va hw.cxgbe.qsize_txq -The size, in number of entries, of the descriptor ring used for a tx -queue. +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..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 -The size, in number of entries, of the descriptor ring used for an -rx queue. +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..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 -The interrupt types that the driver is allowed to use. -Bit 0 represents INTx (line interrupts), bit 1 MSI, bit 2 MSI-X. +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 will select the best possible type out of the allowed types by -itself. +The driver selects the best possible type out of the allowed types. .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 -The number of bytes of padding inserted before the beginning of an Ethernet +Number of padding bytes inserted before the beginning 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. .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. 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..X.pause_settings sysctl. .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.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. .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 will never attempt to allocate a receive buffer larger than -largest_rx_cluster and will fall back to allocating buffers of +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..X.cf and dev..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..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 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 . Index: head/share/man/man4/cxgbev.4 =================================================================== --- head/share/man/man4/cxgbev.4 (revision 310423) +++ head/share/man/man4/cxgbev.4 (revision 310424) @@ -1,324 +1,323 @@ .\" 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 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE .\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS .\" 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. .\" .\" * Other names and brands may be claimed as the property of others. .\" .\" $FreeBSD$ .\" -.Dd December 5, 2016 +.Dd December 22, 2016 .Dt CXGBEV 4 .Os .Sh NAME .Nm cxgbev .Nd "Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 10Gb, and 1Gb Ethernet VF 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" .Cd "device cxgbev" .Ed .Pp To load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : .Bd -literal -offset indent if_cxgbev_load="YES" .Ed .Sh DESCRIPTION The .Nm driver provides support for Virtual Functions on 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" .It Sy ASIC Ta Sy Port Name Ta Sy Parent Device .It T4 Ta cxgbev Ta t4vf .It T5 Ta cxlv Ta t5vf .It T6 Ta ccv Ta t6vf .El .Pp Loader tunables with the hw.cxgbe prefix apply to VFs from all cards. The Physical Function driver for Chelsio Terminator adapters shares these tunables. The driver provides sysctl MIBs for both ports and parent devices using the names above. -For example, a T5 VF will provide port MIBs under dev.cxlv and +For example, a T5 VF provides port MIBs under dev.cxlv and parent device MIBs under dev.t5vf. -References to sysctl MIBs in the remainder of this page will use +References to sysctl MIBs in the remainder of this page use dev. for port MIBs and dev. for parent device MIBs. .Pp For more information on configuring this device, see .Xr ifconfig 8 . .Sh HARDWARE The .Nm driver supports Virtual Functions on 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 Virtual Functions on 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 Virtual Functions on 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 . .Bl -tag -width indent .It Va hw.cxgbe.ntxq10g -The number of tx queues to use for a 10Gb or higher-speed port. +Number of tx queues used for a 10Gb or higher-speed port. The default is 16 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nrxq10g -The number of rx queues to use for a 10Gb or higher-speed port. +Number of rx queues used for a 10Gb or higher-speed port. The default is 8 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.ntxq1g -The number of tx queues to use for a 1Gb port. +Number of tx queues used for a 1Gb port. The default is 4 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.nrxq1g -The number of rx queues to use for a 1Gb port. +Number of rx queues used for a 1Gb port. The default is 2 or the number of CPU cores in the system, whichever is less. .It Va hw.cxgbe.holdoff_timer_idx_10G .It Va hw.cxgbe.holdoff_timer_idx_1G -The timer index value to use to delay interrupts. +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. 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..X.holdoff_tmr_idx sysctl. .It Va hw.cxgbe.holdoff_pktc_idx_10G .It Va 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 +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. 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..X.holdoff_pktc_idx sysctl. This sysctl works only when the interface has never been marked up (as done by ifconfig up). .It Va hw.cxgbe.qsize_txq -The size, in number of entries, of the descriptor ring used for a tx -queue. +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..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 -The size, in number of entries, of the descriptor ring used for an -rx queue. +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..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 -The interrupt types that the driver is allowed to use. -Bit 0 represents INTx (line interrupts), bit 1 MSI, bit 2 MSI-X. +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 will select the best possible type out of the allowed types by -itself. +The driver selects the best possible type out of the allowed types. +Note that Virtual Functions do not support INTx interrupts and fail +to attach if neither MSI nor MSI-X are enabled. .It Va hw.cxgbe.fl_pktshift -The number of bytes of padding inserted before the beginning of an Ethernet +Number of padding bytes inserted before the beginning 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. .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.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.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. .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 will never attempt to allocate a receive buffer larger than -largest_rx_cluster and will fall back to allocating buffers of +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. .El .Pp Certain settings and resources for Virtual Functions are dictated by the parent Physical Function driver. -For example, the Physical Function driver limits the number of queues a -Virtual Function is permitted to use. +For example, the Physical Function driver limits the number of queues +available to a Virtual Function. Some of these limits can be adjusted in the firmware configuration file used with the Physical Function driver. .Pp The PAUSE settings on the port of a Virtual Function are inherited from the settings of the same port on the Physical Function. Virtual Functions cannot modify the setting and track changes made to the associated port's setting by the Physical Function driver. .Pp Receive queues on a Virtual Function always drop packets in response to congestion .Po equivalent to setting .Va hw.cxgbe.cong_drop to 1 .Pc . .Pp The VF driver currently depends on the PF driver. -As a result, loading the VF driver will also load the PF driver as a +As a result, loading the VF driver also loads the PF driver as a dependency. .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 cxgbe 4 , .Xr netintro 4 , .Xr ng_ether 4 , .Xr ifconfig 8 .Sh HISTORY The .Nm device driver 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 and .An John Baldwin Aq Mt jhb@FreeBSD.org .