virtio: add new library virtio

Exported lib/bdev/rte_virtio as a separate
library not dependent on bdev.

Virtio is now accessible via spdk_internal/virtio.h.
The header is marked `internal`, as it's
not meant to be used by end users. It's
not handy to handle all backend-specific
(e.g. Virtio-SCSI) logic in a user code.

For now the Virtio interface is publicly
exposed only via bdev_virtio module. We
might want to consider adding a separate,
public Virtio-SCSI library in the future.

Note: this patch doesn't do any changes
to the virtio code. Everything is
moved 1:1.

Change-Id: I805e5d12d265d82b0bc5784c89fbadb81abdb278
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/388166
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

lib/Makefile

@@ -40,6 +40,7 @@ DIRS-y += bdev blob blobfs conf copy cunit event json jsonrpc \
 ifeq ($(OS),Linux)
 DIRS-y += nbd
 DIRS-$(CONFIG_VHOST) += vhost
+DIRS-$(CONFIG_VIRTIO) += virtio
 endif
 
 

lib/bdev/virtio/Makefile

@@ -34,14 +34,8 @@
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
 
-CFLAGS += $(ENV_CFLAGS) -I$(SPDK_ROOT_DIR)/lib/bdev/ -Irte_virtio
-CFLAGS += -I$(SPDK_ROOT_DIR)/lib/vhost/linux
-
+CFLAGS += $(ENV_CFLAGS)
 C_SRCS = bdev_virtio.c bdev_virtio_rpc.c
-C_SRCS += rte_virtio/virtio.c rte_virtio/virtio_pci.c
-C_SRCS += rte_virtio/virtio_user.c
-C_SRCS += rte_virtio/virtio_user/vhost_user.c
-
 LIBNAME = bdev_virtio
 
 include $(SPDK_ROOT_DIR)/mk/spdk.lib.mk

lib/bdev/virtio/bdev_virtio.c

@@ -45,10 +45,10 @@
 
 #include "spdk_internal/bdev.h"
 #include "spdk_internal/log.h"
+#include "spdk_internal/virtio.h"
 
 #include <linux/virtio_scsi.h>
 
-#include "rte_virtio/virtio.h"
 #include "bdev_virtio.h"
 
 #define BDEV_VIRTIO_MAX_TARGET 64

lib/virtio/Makefile

@@ -0,0 +1,42 @@
+#
+#  BSD LICENSE
+#
+#  Copyright (c) Intel Corporation.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions
+#  are met:
+#
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * 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.
+#    * Neither the name of Intel Corporation nor the names of its
+#      contributors may be used to endorse or promote products derived
+#      from this software without specific prior written permission.
+#
+#  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.
+#
+
+SPDK_ROOT_DIR := $(abspath $(CURDIR)/../..)
+include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
+
+CFLAGS += $(ENV_CFLAGS)
+C_SRCS = virtio.c virtio_user.c virtio_pci.c
+C_SRCS += virtio_user/vhost_user.c
+LIBNAME = virtio
+
+include $(SPDK_ROOT_DIR)/mk/spdk.lib.mk

lib/virtio/virtio.c

@@ -55,6 +55,8 @@
 #include "spdk/env.h"
 #include "spdk/barrier.h"
 
+#include "spdk_internal/virtio.h"
+
 /* We use SMP memory barrier variants as all virtio_pci devices
  * are purely virtual. All MMIO is executed on a CPU core, so
  * there's no need to do full MMIO synchronization.
@@ -63,8 +65,6 @@
 #define virtio_rmb()	spdk_smp_rmb()
 #define virtio_wmb()	spdk_smp_wmb()
 
-#include "virtio.h"
-
 struct virtio_driver g_virtio_driver = {
 	.scsi_devs = TAILQ_HEAD_INITIALIZER(g_virtio_driver.scsi_devs),
 };

lib/virtio/virtio_pci.c

@@ -38,7 +38,7 @@
 #include "spdk/env.h"
 #include "spdk/pci_ids.h"
 
-#include "virtio.h"
+#include "spdk_internal/virtio.h"
 
 struct virtio_hw {
 	uint8_t	    use_msix;

lib/virtio/virtio_user.c

@@ -42,10 +42,10 @@
 #include <rte_alarm.h>
 
 #include "virtio_user/vhost.h"
-#include "virtio.h"
-
 #include "spdk/string.h"
 
+#include "spdk_internal/virtio.h"
+
 static int
 virtio_user_create_queue(struct virtio_dev *vdev, uint32_t queue_sel)
 {

lib/virtio/virtio_user/vhost.h

@@ -39,8 +39,7 @@
 #include <linux/vhost.h>
 
 #include "spdk_internal/log.h"
-
-#include "../virtio.h"
+#include "spdk_internal/virtio.h"
 
 enum vhost_user_request {
 	VHOST_USER_NONE = 0,

mk/spdk.modules.mk

@@ -41,7 +41,7 @@ BLOCKDEV_MODULES_DEPS += -libverbs -lrdmacm
 endif
 
 ifeq ($(OS),Linux)
-BLOCKDEV_MODULES_LIST += bdev_aio bdev_virtio
+BLOCKDEV_MODULES_LIST += bdev_aio bdev_virtio virtio
 BLOCKDEV_MODULES_DEPS += -laio
 endif