1.\" Copyright (c) 2011, Chelsio Inc 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions are met: 6.\" 7.\" 1. Redistributions of source code must retain the above copyright notice, 8.\" this list of conditions and the following disclaimer. 9.\" 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" 3. Neither the name of the Chelsio Inc nor the names of its 15.\" contributors may be used to endorse or promote products derived from 16.\" this software without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.\" * Other names and brands may be claimed as the property of others. 31.\" 32.\" $FreeBSD$ 33.\" 34.Dd February 14, 2011 35.Dt CXGBE 4 36.Os 37.Sh NAME 38.Nm cxgbe 39.Nd "Chelsio T4 10Gb and 1Gb Ethernet adapter driver" 40.Sh SYNOPSIS 41To compile this driver into the kernel, 42place the following lines in your 43kernel configuration file: 44.Bd -ragged -offset indent 45.Cd "device cxgbe" 46.Ed 47.Pp 48To load the driver as a 49module at boot time, place the following line in 50.Xr loader.conf 5 : 51.Bd -literal -offset indent 52if_cxgbe_load="YES" 53.Ed 54.Sh DESCRIPTION 55The 56.Nm 57driver provides support for PCI Express Ethernet adapters based on 58the Chelsio Terminator 4 (T4) ASIC. 59The driver supprts Jumbo Frames, Transmit/Receive checksum offload, 60TCP segmentation offload (TSO), Large Receive Offload (LRO), VLAN 61tag insertion/extraction, VLAN checksum offload, VLAN TSO, and 62Receive Side Steering (RSS). 63 64For further hardware information and questions related to hardware 65requirements, see 66.Pa http://www.chelsio.com/ . 67.Pp 68For more information on configuring this device, see 69.Xr ifconfig 8 . 70.Sh HARDWARE 71The 72.Nm 73driver supports 10Gb and 1Gb Ethernet adapters based on the T4 ASIC: 74.Pp 75.Bl -bullet -compact 76.It 77Chelsio T420-CR 78.It 79Chelsio T422-CR 80.It 81Chelsio T440-CR 82.It 83Chelsio T420-BCH 84.It 85Chelsio T440-BCH 86.It 87Chelsio T440-CH 88.It 89Chelsio T420-SO 90.It 91Chelsio T420-CX 92.It 93Chelsio T420-BT 94.It 95Chelsio T404-BT 96.El 97.Sh LOADER TUNABLES 98Tunables can be set at the 99.Xr loader 8 100prompt before booting the kernel or stored in 101.Xr loader.conf 5 . 102.Bl -tag -width indent 103.It Va hw.cxgbe.max_ntxq_10G_port 104The maximum number of tx queues to use for a 10Gb port. 105The default value is 8. 106.It Va hw.cxgbe.max_nrxq_10G_port 107The maximum number of rx queues to use for a 10Gb port. 108The default value is 8. 109.It Va hw.cxgbe.max_ntxq_1G_port 110The maximum number of tx queues to use for a 1Gb port. 111The default value is 2. 112.It Va hw.cxgbe.max_nrxq_1G_port 113The maximum number of rx queues to use for a 1Gb port. 114The default value is 2. 115.It Va hw.cxgbe.holdoff_timer_idx_10G 116.It Va hw.cxgbe.holdoff_timer_idx_1G 117The timer index value to use to delay interrupts. 118The holdoff timer list has the values 1, 5, 10, 50, 100, and 200 119by default (all values are in microseconds) and the index selects a 120value from this list. 121The default value is 1 for both 10Gb and 1Gb ports, which means the 122timer value is 5us. 123.It Va hw.cxgbe.holdoff_pktc_idx_10G 124.It Va hw.cxgbe.holdoff_pktc_idx_1G 125The packet-count index value to use to delay interrupts. 126The packet-count list has the values 1, 8, 16, and 32 by default 127and the index selects a value from this list. 128The default value is 2 for both 10Gb and 1Gb ports, which means 16 129packets (or the holdoff timer going off) before an interrupt is 130generated. 131.It Va hw.cxgbe.qsize_txq 132The size, in number of entries, of the descriptor ring used for a tx 133queue. 134A buf_ring of the same size is also allocated for additional 135software queuing. See 136.Xr ifnet 9 . 137The default value is 1024. 138.It Va hw.cxgbe.qsize_rxq 139The size, in number of entries, of the descriptor ring used for an 140rx queue. 141The default value is 1024. 142.Sh SUPPORT 143For general information and support, 144go to the Chelsio support website at: 145.Pa http://www.chelsio.com/ . 146.Pp 147If an issue is identified with this driver with a supported adapter, 148email all the specific information related to the issue to 149.Aq support@chelsio.com . 150.Sh SEE ALSO 151.Xr altq 4 , 152.Xr arp 4 , 153.Xr cxgb 4 , 154.Xr netintro 4 , 155.Xr ng_ether 4 , 156.Xr ifconfig 8 157.Sh HISTORY 158The 159.Nm 160device driver first appeared in 161.Fx 9.0 162.Sh AUTHORS 163.An -nosplit 164The 165.Nm 166driver was written by 167.An Navdeep Parhar Aq np@FreeBSD.org . 168