net/vdev_netvsc: introduce Hyper-V platform driver

This patch lays the groundwork for this driver (draft documentation,
copyright notices, code base skeleton and build system hooks). While it can
be successfully compiled and invoked, it's an empty shell at this stage.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Signed-off-by: Matan Azrad <matan@mellanox.com>

MAINTAINERS

@@ -473,6 +473,12 @@ F: drivers/net/mrvl/
 F: doc/guides/nics/mrvl.rst
 F: doc/guides/nics/features/mrvl.ini
 
+Microsoft vdev_netvsc - EXPERIMENTAL
+M: Matan Azrad <matan@mellanox.com>
+F: drivers/net/vdev_netvsc/
+F: doc/guides/nics/vdev_netvsc.rst
+F: doc/guides/nics/features/vdev_netvsc.ini
+
 Netcope szedata2
 M: Matej Vido <vido@cesnet.cz>
 F: drivers/net/szedata2/

config/common_base

@@ -278,6 +278,11 @@ CONFIG_RTE_LIBRTE_NFP_DEBUG_RX=n
 #
 CONFIG_RTE_LIBRTE_MRVL_PMD=n
 
+#
+# Compile virtual device driver for NetVSC on Hyper-V/Azure
+#
+CONFIG_RTE_LIBRTE_VDEV_NETVSC_PMD=n
+
 #
 # Compile burst-oriented Broadcom BNXT PMD driver
 #

config/common_linuxapp

@@ -47,6 +47,7 @@ CONFIG_RTE_LIBRTE_PMD_VHOST=y
 CONFIG_RTE_LIBRTE_PMD_AF_PACKET=y
 CONFIG_RTE_LIBRTE_PMD_TAP=y
 CONFIG_RTE_LIBRTE_AVP_PMD=y
+CONFIG_RTE_LIBRTE_VDEV_NETVSC_PMD=y
 CONFIG_RTE_LIBRTE_NFP_PMD=y
 CONFIG_RTE_LIBRTE_POWER=y
 CONFIG_RTE_VIRTIO_USER=y

doc/guides/nics/features/vdev_netvsc.ini

@@ -0,0 +1,12 @@
+;
+; Supported features of the 'vdev_netvsc' network poll mode driver.
+;
+; Refer to default.ini for the full list of available PMD features.
+;
+[Features]
+ARMv7                = Y
+ARMv8                = Y
+Power8               = Y
+x86-32               = Y
+x86-64               = Y
+Usage doc            = Y

doc/guides/nics/index.rst

@@ -64,6 +64,7 @@ Network Interface Controller Drivers
     szedata2
     tap
     thunderx
+    vdev_netvsc
     virtio
     vhost
     vmxnet3

doc/guides/nics/vdev_netvsc.rst

@@ -0,0 +1,20 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright 2017 6WIND S.A.
+    Copyright 2017 Mellanox Technologies, Ltd.
+
+VDEV_NETVSC driver
+==================
+
+The VDEV_NETVSC driver (librte_pmd_vdev_netvsc) provides support for NetVSC
+interfaces and associated SR-IOV virtual function (VF) devices found in
+Linux virtual machines running on Microsoft Hyper-V_ (including Azure)
+platforms.
+
+.. _Hyper-V: https://docs.microsoft.com/en-us/windows-hardware/drivers/network/overview-of-hyper-v
+
+Build options
+-------------
+
+- ``CONFIG_RTE_LIBRTE_VDEV_NETVSC_PMD`` (default ``y``)
+
+   Toggle compilation of this driver.

drivers/net/Makefile

@@ -39,6 +39,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD) += sfc
 DIRS-$(CONFIG_RTE_LIBRTE_PMD_SZEDATA2) += szedata2
 DIRS-$(CONFIG_RTE_LIBRTE_PMD_TAP) += tap
 DIRS-$(CONFIG_RTE_LIBRTE_THUNDERX_NICVF_PMD) += thunderx
+DIRS-$(CONFIG_RTE_LIBRTE_VDEV_NETVSC_PMD) += vdev_netvsc
 DIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio
 DIRS-$(CONFIG_RTE_LIBRTE_VMXNET3_PMD) += vmxnet3
 

drivers/net/vdev_netvsc/Makefile

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright 2017 6WIND S.A.
+# Copyright 2017 Mellanox Technologies, Ltd.
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# Properties of the generated library.
+LIB = librte_pmd_vdev_netvsc.a
+LIBABIVER := 1
+EXPORT_MAP := rte_pmd_vdev_netvsc_version.map
+
+# Additional compilation flags.
+CFLAGS += -O3
+CFLAGS += -g
+CFLAGS += -std=c11 -pedantic -Wall -Wextra
+CFLAGS += $(WERROR_FLAGS)
+
+# Dependencies.
+LDLIBS += -lrte_bus_vdev
+LDLIBS += -lrte_eal
+LDLIBS += -lrte_ethdev
+LDLIBS += -lrte_kvargs
+
+# Source files.
+SRCS-$(CONFIG_RTE_LIBRTE_VDEV_NETVSC_PMD) += vdev_netvsc.c
+
+include $(RTE_SDK)/mk/rte.lib.mk

drivers/net/vdev_netvsc/rte_pmd_vdev_netvsc_version.map

@@ -0,0 +1,4 @@
+DPDK_18.02 {
+
+	local: *;
+};

drivers/net/vdev_netvsc/vdev_netvsc.c

@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2017 6WIND S.A.
+ * Copyright 2017 Mellanox Technologies, Ltd.
+ */
+
+#include <stddef.h>
+
+#include <rte_bus_vdev.h>
+#include <rte_common.h>
+#include <rte_config.h>
+#include <rte_kvargs.h>
+#include <rte_log.h>
+
+#define VDEV_NETVSC_DRIVER net_vdev_netvsc
+#define VDEV_NETVSC_ARG_IFACE "iface"
+#define VDEV_NETVSC_ARG_MAC "mac"
+
+#define DRV_LOG(level, ...) \
+	rte_log(RTE_LOG_ ## level, \
+		vdev_netvsc_logtype, \
+		RTE_FMT(RTE_STR(VDEV_NETVSC_DRIVER) ": " \
+			RTE_FMT_HEAD(__VA_ARGS__,) "\n", \
+		RTE_FMT_TAIL(__VA_ARGS__,)))
+
+/** Driver-specific log messages type. */
+static int vdev_netvsc_logtype;
+
+/** Number of driver instances relying on context list. */
+static unsigned int vdev_netvsc_ctx_inst;
+
+/**
+ * Probe NetVSC interfaces.
+ *
+ * @param dev
+ *   Virtual device context for driver instance.
+ *
+ * @return
+ *    Always 0, even in case of errors.
+ */
+static int
+vdev_netvsc_vdev_probe(struct rte_vdev_device *dev)
+{
+	static const char *const vdev_netvsc_arg[] = {
+		VDEV_NETVSC_ARG_IFACE,
+		VDEV_NETVSC_ARG_MAC,
+		NULL,
+	};
+	const char *name = rte_vdev_device_name(dev);
+	const char *args = rte_vdev_device_args(dev);
+	struct rte_kvargs *kvargs = rte_kvargs_parse(args ? args : "",
+						     vdev_netvsc_arg);
+
+	DRV_LOG(DEBUG, "invoked as \"%s\", using arguments \"%s\"", name, args);
+	if (!kvargs) {
+		DRV_LOG(ERR, "cannot parse arguments list");
+		goto error;
+	}
+error:
+	if (kvargs)
+		rte_kvargs_free(kvargs);
+	++vdev_netvsc_ctx_inst;
+	return 0;
+}
+
+/**
+ * Remove driver instance.
+ *
+ * @param dev
+ *   Virtual device context for driver instance.
+ *
+ * @return
+ *   Always 0.
+ */
+static int
+vdev_netvsc_vdev_remove(__rte_unused struct rte_vdev_device *dev)
+{
+	--vdev_netvsc_ctx_inst;
+	return 0;
+}
+
+/** Virtual device descriptor. */
+static struct rte_vdev_driver vdev_netvsc_vdev = {
+	.probe = vdev_netvsc_vdev_probe,
+	.remove = vdev_netvsc_vdev_remove,
+};
+
+RTE_PMD_REGISTER_VDEV(VDEV_NETVSC_DRIVER, vdev_netvsc_vdev);
+RTE_PMD_REGISTER_ALIAS(VDEV_NETVSC_DRIVER, eth_vdev_netvsc);
+RTE_PMD_REGISTER_PARAM_STRING(net_vdev_netvsc,
+			      VDEV_NETVSC_ARG_IFACE "=<string> "
+			      VDEV_NETVSC_ARG_MAC "=<string>");
+
+/** Initialize driver log type. */
+RTE_INIT(vdev_netvsc_init_log)
+{
+	vdev_netvsc_logtype = rte_log_register("pmd.vdev_netvsc");
+	if (vdev_netvsc_logtype >= 0)
+		rte_log_set_level(vdev_netvsc_logtype, RTE_LOG_NOTICE);
+}

mk/rte.app.mk

@@ -158,6 +158,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD)    += -lrte_pmd_sfc_efx
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_SZEDATA2)   += -lrte_pmd_szedata2 -lsze2
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_TAP)        += -lrte_pmd_tap
 _LDLIBS-$(CONFIG_RTE_LIBRTE_THUNDERX_NICVF_PMD) += -lrte_pmd_thunderx_nicvf
+_LDLIBS-$(CONFIG_RTE_LIBRTE_VDEV_NETVSC_PMD) += -lrte_pmd_vdev_netvsc
 _LDLIBS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD)     += -lrte_pmd_virtio
 ifeq ($(CONFIG_RTE_LIBRTE_VHOST),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_VHOST)      += -lrte_pmd_vhost