1.\" Copyright (c) 2015, Mellanox Technologies, Inc. All rights reserved. 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 13.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 14.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 15.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 16.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 17.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 18.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 19.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 20.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 21.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 22.\" SUCH DAMAGE. 23.\" 24.Dd June 6, 2016 25.Dt ISER 4 26.Os 27.Sh NAME 28.Nm iser 29.Nd iSCSI Extensions for RDMA (iSER) driver 30.Sh SYNOPSIS 31To compile this driver into the kernel, 32place the following line in the 33kernel configuration file: 34.Bd -ragged -offset indent 35.Cd "device iser" 36.Ed 37.Pp 38Alternatively, to load the driver as a 39module at boot time, place the following line in 40.Xr loader.conf 5 : 41.Bd -literal -offset indent 42iser_load="YES" 43.Ed 44.Sh DESCRIPTION 45The 46.Nm 47(iSCSI Extensions for RDMA) initiator driver extends the iSCSI protocol to RDMA. 48It permits data to be transferred directly into and out of SCSI buffers 49without intermediate data copies. 50iSER uses the RDMA protocol suite to supply higher bandwidth for 51block storage transfers (zero copy behavior). 52To that fact, it eliminates the 53TCP/IP processing overhead while preserving the compatibility with iSCSI protocol. 54The initiator is the iSCSI/iSER client, which connects to an iSCSI/iSER target, 55providing local access to a remote block device. 56The userland component is provided by 57.Xr iscsid 8 58and both the kernel and userland are configured using 59.Xr iscsictl 8 . 60.Sh SYSCTL VARIABLES 61The following variables are available as both 62.Xr sysctl 8 63variables and 64.Xr loader 8 65tunables: 66.Bl -tag -width indent 67.It Va kern.iser.debug 68Verbosity level for log messages from the 69.Nm 70driver. 71Set to 0 to disable logging or 1 to warn about potential problems. 72Larger values enable info and debugging output. 73Defaults to 0. 74.El 75.Sh SEE ALSO 76.Xr iscsi 4 , 77.Xr iscsi.conf 5 , 78.Xr iscsictl 8 , 79.Xr iscsid 8 80.Sh HISTORY 81The 82.Nm 83subsystem first appeared in 84.Fx 11.0 . 85.Sh AUTHORS 86The 87.Nm 88subsystem was developed by 89.An Max Gurtovoy Aq Mt maxg@mellanox.com 90and 91.An Sagi Grimberg Aq Mt sagig@mellanox.com 92under sponsorship from Mellanox Technologies. 93