initial buildroot for linux 5.15

package/iperf3/Config.in

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+config BR2_PACKAGE_IPERF3
+	bool "iperf3"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	help
+	  iperf is a tool for active measurements of the maximum
+	  achievable bandwidth on IP networks.
+	  It supports tuning of various parameters related to timing,
+	  protocols, and buffers. For each test it reports the
+	  bandwidth, loss, and other parameters.
+	  It's a redesign of the NLANR/DAST iperf(2) and is not backward
+	  compatible.
+
+	  http://software.es.net/iperf/index.html
+
+comment "iperf3 needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS

package/iperf3/iperf3.hash

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+# From https://downloads.es.net/pub/iperf/iperf-3.10.1.tar.gz.sha256
+sha256  03bc9760cc54a245191d46bfc8edaf8a4750f0e87abca6764486972044d6715a  iperf-3.10.1.tar.gz
+# Locally computed
+sha256  0e1cb1921904626f0d3e86cacc0e28333140f0f9957267cff0b9d185645743ed  LICENSE

package/iperf3/iperf3.mk

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+################################################################################
+#
+# iperf3
+#
+################################################################################
+
+IPERF3_VERSION = 3.10.1
+IPERF3_SITE = https://downloads.es.net/pub/iperf
+IPERF3_SOURCE = iperf-$(IPERF3_VERSION).tar.gz
+IPERF3_LICENSE = BSD-3-Clause, BSD-2-Clause, MIT
+IPERF3_LICENSE_FILES = LICENSE
+IPERF3_CPE_ID_VENDOR = es
+
+IPERF3_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE"
+
+ifeq ($(BR2_PACKAGE_OPENSSL),y)
+# We intentionally don't pass --with-openssl, otherwise pkg-config is
+# not used, and indirect libraries are not picked up when static
+# linking.
+IPERF3_DEPENDENCIES += host-pkgconf openssl
+else
+IPERF3_CONF_OPTS += --without-openssl
+endif
+
+$(eval $(autotools-package))