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-.\"
-.\" This file and its contents are supplied under the terms of the
-.\" Common Development and Distribution License ("CDDL"), version 1.0.
-.\" You may only use this file in accordance with the terms of version
-.\" 1.0 of the CDDL.
-.\"
-.\" A full copy of the text of the CDDL should have accompanied this
-.\" source.  A copy of the CDDL is also available via the Internet at
-.\" http://www.illumos.org/license/CDDL.
-.\"
-.\"
-.\" Copyright 2021 Oxide Computer Company
-.\"
-.Dd Nov 17, 2021
-.Dt ENA 7D
-.Os
-.Sh NAME
-.Nm ena
-.Nd Driver for the AWS Elastic Network Adapter
-.Sh SYNOPSIS
-.Pa /dev/net/ena*
-.Sh DESCRIPTION
-The
-.Sy ena
-driver is a GLDv3 NIC driver for the AWS Elastic Network Adapter
-family of virtual devices.
-The driver supports:
-.Bl -dash -offset indent
-.It
-Jumbo frames up to 9216 bytes.
-.It
-Multiple Rx and Tx rings.
-.El
-.Pp
-By design, this driver does not support VNICs.
-A given ENA device can only ever receive traffic for a single unicast
-MAC address and IP address combination, as determined by the AWS configuration.
-There is no support for promiscuous mode, or for receiving traffic for
-additional unicast or multicast addresses.
-.Sh CONFIGURATION
-The
-.Sy ena.conf
-file contains user configurable parameters, each of which is described
-below.
-This file is read when an ENA device is found and an instance of the
-driver is attached to it.
-Changes made to this file do not affect running instances.
-Only instances attached after the changes will see the effects of
-those changes.
-Therefore, if you want your change to take effect on a running
-instance, you must somehow reload it.
-That could be done by a manual reloading of the driver or a system
-reboot.
-.Sh PROPERTIES
-The configuration file can be found at
-.Pa /kernel/drv/ena.conf .
-.Bl -hang -width Ds
-.It Sy rx_queue_num_descs
-.Bd -filled -compact
-Minimum:
-.Sy 64 |
-Maximum:
-.Sy device dependent
-.Ed
-.Bd -filled -compact
-Default:
-.Sy device maximum
-.Ed
-.Bd -filled
-The
-.Sy rx_queue_num_descs
-property determines the number of descriptors provided by the Rx queue.
-Currently a single descriptor is equal to a single packet, but in the
-future it may be that a single packet consumes multiple descriptors.
-.Ed
-.It Sy rx_queue_intr_limit
-.Bd -filled -compact
-Minimum:
-.Sy 16 |
-Maximum:
-.Sy 4096
-.Ed
-.Bd -filled -compact
-Default:
-.Sy 256
-.Ed
-.Bd -filled
-The
-.Sy rx_queue_intr_limit
-property determines the number frames an Rx interrupt will attempt to
-process before returning and claiming the interrupt.
-This is meant to keep the ENA Rx interrupt handler from consuming too
-much system time.
-In general, when a NIC becomes saturated with packets, the
-.Sy MAC
-layer will switch the driver into polling mode to reduce interrupt
-load.
-.Ed
-.It Sy tx_queue_num_descs
-.Bd -filled -compact
-Minimum:
-.Sy 64 |
-Maximum:
-.Sy device dependent
-.Ed
-.Bd -filled -compact
-Default:
-.Sy device maximum
-.Ed
-.Bd -filled
-The
-.Sy tx_queue_num_descs
-property determines the number of descriptors provided by the Tx queue.
-Currently a single descriptor is equal to a single packet, but in the
-future it may be that a single packet consumes multiple descriptors.
-.Ed
-.El
-.Sh FILES
-.Bl -tag -width Pa
-.It Pa /kernel/drv/amd64/ena
-Device driver (x86)
-.It Pa /kernel/drv/ena.conf
-Driver configuration file containing user-configurable options
-.El
-.Sh INTERFACE STABILITY
-The tunables in
-.Pa ena.conf
-are considered
-.Sy Evolving
-and may change in the future.
-.Sh SEE ALSO
-.Xr dladm 1M ,
-.Xr snoop 1M ,
-.Xr driver.conf 4 ,
-.Xr dlpi 7P