Add support for Amazon Elastic Network Adapter (ENA) NIC

ENA is a networking interface designed to make good use of modern CPU
features and system architectures.

The ENA device exposes a lightweight management interface with a
minimal set of memory mapped registers and extendable command set
through an Admin Queue.

The driver supports a range of ENA devices, is link-speed independent
(i.e., the same driver is used for 10GbE, 25GbE, 40GbE, etc.), and has
a negotiated and extendable feature set.

Some ENA devices support SR-IOV. This driver is used for both the
SR-IOV Physical Function (PF) and Virtual Function (VF) devices.

ENA devices enable high speed and low overhead network traffic
processing by providing multiple Tx/Rx queue pairs (the maximum number
is advertised by the device via the Admin Queue), a dedicated MSI-X
interrupt vector per Tx/Rx queue pair, and CPU cacheline optimized
data placement.

The ENA driver supports industry standard TCP/IP offload features such
as checksum offload and TCP transmit segmentation offload (TSO).
Receive-side scaling (RSS) is supported for multi-core scaling.

The ENA driver and its corresponding devices implement health
monitoring mechanisms such as watchdog, enabling the device and driver
to recover in a manner transparent to the application, as well as
debug logs.

Some of the ENA devices support a working mode called Low-latency
Queue (LLQ), which saves several more microseconds. This feature will
be implemented for driver in future releases.

Submitted by:	Michal Krawczyk <mk@semihalf.com>
		Jakub Palider <jpa@semihalf.com>
		Jan Medala <jan@semihalf.com>
Obtained from: Semihalf
Sponsored by: Amazon.com Inc.
Differential revision: https://reviews.freebsd.org/D10427

2 files changed, 43 insertions, 0 deletions

diff --git a/sys/modules/Makefile b/sys/modules/Makefile
index ce843a51adaa..09ec8a702ec4 100644
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -107,6 +107,7 @@ SUBDIR=	\
 	${_efirt} \
 	${_elink} \
 	${_em} \
+	${_ena} \
 	${_ep} \
 	${_epic} \
 	esp \
@@ -566,6 +567,7 @@ _drm=		drm
 _drm2=		drm2
 _ed=		ed
 _em=		em
+_ena=		ena
 _ep=		ep
 _et=		et
 _exca=		exca
diff --git a/sys/modules/ena/Makefile b/sys/modules/ena/Makefile
new file mode 100644
index 000000000000..fc70205ae956
--- /dev/null
+++ b/sys/modules/ena/Makefile
@@ -0,0 +1,41 @@
+#
+# BSD LICENSE
+#
+# Copyright (c) 2015-2017 Amazon.com, Inc. or its affiliates.
+# 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.
+#
+# 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.
+#
+# $FreeBSD$
+#
+
+.PATH:	${SRCTOP}/sys/dev/ena \
+	${SRCTOP}/sys/contrib/ena-com
+
+KMOD	= if_ena
+SRCS	= ena.c ena_com.c ena_eth_com.c ena_sysctl.c
+SRCS	+= device_if.h bus_if.h pci_if.h
+CFLAGS  += -I${SRCTOP}/sys/contrib
+
+.include <bsd.kmod.mk>