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.\" 25.\" $FreeBSD$ 26.Dd June 6, 2016 27.Dt ISER 4 28.Os 29.Sh NAME 30.Nm iser 31.Nd iSCSI Extensions for RDMA (iSER) driver 32.Sh SYNOPSIS 33To compile this driver into the kernel, 34place the following line in the 35kernel configuration file: 36.Bd -ragged -offset indent 37.Cd "device iser" 38.Ed 39.Pp 40Alternatively, to load the driver as a 41module at boot time, place the following line in 42.Xr loader.conf 5 : 43.Bd -literal -offset indent 44iser_load="YES" 45.Ed 46.Sh DESCRIPTION 47The 48.Nm 49(iSCSI Extensions for RDMA) initiator driver extends the iSCSI protocol to RDMA. 50It permits data to be transferred directly into and out of SCSI buffers 51without intermediate data copies. 52iSER uses the RDMA protocol suite to supply higher bandwidth for 53block storage transfers (zero copy behavior). 54To that fact, it eliminates the 55TCP/IP processing overhead while preserving the compatibility with iSCSI protocol. 56The initiator is the iSCSI/iSER client, which connects to an iSCSI/iSER target, 57providing local access to a remote block device. 58The userland component is provided by 59.Xr iscsid 8 60and both the kernel and userland are configured using 61.Xr iscsictl 8 . 62.Sh SYSCTL VARIABLES 63The following variables are available as both 64.Xr sysctl 8 65variables and 66.Xr loader 8 67tunables: 68.Bl -tag -width indent 69.It Va kern.iser.debug 70Verbosity level for log messages from the 71.Nm 72driver. 73Set to 0 to disable logging or 1 to warn about potential problems. 74Larger values enable info and debugging output. 75Defaults to 0. 76.El 77.Sh SEE ALSO 78.Xr iscsi 4 , 79.Xr iscsi.conf 5 , 80.Xr iscsictl 8 , 81.Xr iscsid 8 82.Sh HISTORY 83The 84.Nm 85subsystem first appeared in 86.Fx 11.0 . 87.Sh AUTHORS 88The 89.Nm 90subsystem was developed by 91.An Max Gurtovoy Aq Mt maxg@mellanox.com 92and 93.An Sagi Grimberg Aq Mt sagig@mellanox.com 94under sponsorship from Mellanox Technologies. 95