[dpdk-dev] [PATCH v4] examples/vhost: fix ioat dependency issue

[Cheng Jiang <Cheng1.jiang@intel.com>]

Fix vhost-switch compiling issue when ioat dependency is missing.
Change 'RTE_x86' check into 'RTE_RAW_IOAT' check in meson build file.
Use 'RTE_RAW_IOAT' to control conditional compiling in source file.
Clean some codes.

Fixes: abec60e7115d ("examples/vhost: support vhost async data path")
Fixes: 3a04ecb21420 ("examples/vhost: add async vhost args parsing")

Signed-off-by: Cheng Jiang <Cheng1.jiang@intel.com>
---
v4:
 * Use macros in ioat.c for conditional compilation instead of changing Makefile.

v3:
 * Added fixes lines in commit log.

v2:
 * Cleaned some codes
 * Changed RTE_RAW_IOAT check method in Makefile
 * Added ioat function definition when RTE_RAW_IOAT is missing

 examples/vhost/Makefile    |  2 +-
 examples/vhost/ioat.c      |  6 ++++++
 examples/vhost/ioat.h      | 32 +++++++++++++++++++++++++-------
 examples/vhost/main.c      | 22 +++++++++++-----------
 examples/vhost/meson.build |  2 +-
 5 files changed, 44 insertions(+), 20 deletions(-)

diff --git a/examples/vhost/Makefile b/examples/vhost/Makefile
index cec59d0e0..8c969caaa 100644
--- a/examples/vhost/Makefile
+++ b/examples/vhost/Makefile
@@ -5,7 +5,7 @@
 APP = vhost-switch

 # all source are stored in SRCS-y
-SRCS-y := main.c virtio_net.c
+SRCS-y := main.c virtio_net.c ioat.c

 # Build using pkg-config variables if possible
 ifneq ($(shell pkg-config --exists libdpdk && echo 0),0)
diff --git a/examples/vhost/ioat.c b/examples/vhost/ioat.c
index b2c74f653..6f87d7bba 100644
--- a/examples/vhost/ioat.c
+++ b/examples/vhost/ioat.c
@@ -1,13 +1,17 @@
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright(c) 2010-2020 Intel Corporation
  */
+#ifdef RTE_RAW_IOAT
 #include <rte_rawdev.h>
 #include <rte_ioat_rawdev.h>
+#endif /* RTE_RAW_IOAT */
 #include <sys/uio.h>

 #include "ioat.h"
 #include "main.h"

+#ifdef RTE_RAW_IOAT
+
 struct dma_for_vhost dma_bind[MAX_VHOST_DEVICE];

 struct packet_tracker {
@@ -199,3 +203,5 @@ ioat_check_completed_copies_cb(int vid, uint16_t queue_id,
 	/* Opaque data is not supported */
 	return -1;
 }
+
+#endif /* RTE_RAW_IOAT */
diff --git a/examples/vhost/ioat.h b/examples/vhost/ioat.h
index 9664fcc3a..d6e1e2e07 100644
--- a/examples/vhost/ioat.h
+++ b/examples/vhost/ioat.h
@@ -24,14 +24,8 @@ struct dma_for_vhost {
 	uint16_t nr;
 };

-#ifdef RTE_ARCH_X86
+#ifdef RTE_RAW_IOAT
 int open_ioat(const char *value);
-#else
-static int open_ioat(const char *value __rte_unused)
-{
-	return -1;
-}
-#endif

 uint32_t
 ioat_transfer_data_cb(int vid, uint16_t queue_id,
@@ -42,4 +36,28 @@ uint32_t
 ioat_check_completed_copies_cb(int vid, uint16_t queue_id,
 		struct rte_vhost_async_status *opaque_data,
 		uint16_t max_packets);
+#else
+static int open_ioat(const char *value __rte_unused)
+{
+	return -1;
+}
+
+static uint32_t
+ioat_transfer_data_cb(int vid __rte_unused, uint16_t queue_id __rte_unused,
+		struct rte_vhost_async_desc *descs __rte_unused,
+		struct rte_vhost_async_status *opaque_data __rte_unused,
+		uint16_t count __rte_unused)
+{
+	return -1;
+}
+
+static uint32_t
+ioat_check_completed_copies_cb(int vid __rte_unused,
+		uint16_t queue_id __rte_unused,
+		struct rte_vhost_async_status *opaque_data __rte_unused,
+		uint16_t max_packets __rte_unused)
+{
+	return -1;
+}
+#endif
 #endif /* _IOAT_H_ */
diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 59a1aff07..4dc6102ab 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -1294,13 +1294,6 @@ new_device(int vid)
 	int lcore, core_add = 0;
 	uint32_t device_num_min = num_devices;
 	struct vhost_dev *vdev;
-
-	struct rte_vhost_async_channel_ops channel_ops = {
-		.transfer_data = ioat_transfer_data_cb,
-		.check_completed_copies = ioat_check_completed_copies_cb
-	};
-	struct rte_vhost_async_features f;
-
 	vdev = rte_zmalloc("vhost device", sizeof(*vdev), RTE_CACHE_LINE_SIZE);
 	if (vdev == NULL) {
 		RTE_LOG(INFO, VHOST_DATA,
@@ -1342,10 +1335,17 @@ new_device(int vid)
 		vid, vdev->coreid);

 	if (async_vhost_driver) {
-		f.async_inorder = 1;
-		f.async_threshold = 256;
-		return rte_vhost_async_channel_register(vid, VIRTIO_RXQ,
-			f.intval, &channel_ops);
+		struct rte_vhost_async_features f;
+		struct rte_vhost_async_channel_ops channel_ops;
+		if (strncmp(dma_type, "ioat", 4) == 0) {
+			channel_ops.transfer_data = ioat_transfer_data_cb;
+			channel_ops.check_completed_copies =
+				ioat_check_completed_copies_cb;
+			f.async_inorder = 1;
+			f.async_threshold = 256;
+			return rte_vhost_async_channel_register(vid, VIRTIO_RXQ,
+				f.intval, &channel_ops);
+		}
 	}

 	return 0;
diff --git a/examples/vhost/meson.build b/examples/vhost/meson.build
index 24f1f7131..d5388a795 100644
--- a/examples/vhost/meson.build
+++ b/examples/vhost/meson.build
@@ -15,7 +15,7 @@ sources = files(
 	'main.c', 'virtio_net.c'
 )

-if dpdk_conf.has('RTE_ARCH_X86')
+if dpdk_conf.has('RTE_RAW_IOAT')
 	deps += 'raw_ioat'
 	sources += files('ioat.c')
 endif
--
2.29.2