[PATCH v10 09/13] examples/vdpa: add virtio blk support

[Andy Pei <andy.pei@intel.com>]

Add virtio blk device support to vDPA example.

Signed-off-by: Andy Pei <andy.pei@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
---
 examples/vdpa/main.c             | 56 ++++++++++++++++++++++++++++++++++++++++
 examples/vdpa/vdpa_blk_compact.h | 50 +++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 examples/vdpa/vdpa_blk_compact.h

diff --git a/examples/vdpa/main.c b/examples/vdpa/main.c
index 5ab0765..7e11ef4 100644
--- a/examples/vdpa/main.c
+++ b/examples/vdpa/main.c
@@ -20,6 +20,7 @@
 #include <cmdline_parse_string.h>
 #include <cmdline_parse_num.h>
 #include <cmdline.h>
+#include "vdpa_blk_compact.h"
 
 #define MAX_PATH_LEN 128
 #define MAX_VDPA_SAMPLE_PORTS 1024
@@ -159,8 +160,53 @@ struct vdpa_port {
 };
 
 static int
+vdpa_blk_device_set_features_and_protocol(const char *path)
+{
+	uint64_t protocol_features = 0;
+	int ret;
+
+	ret = rte_vhost_driver_set_features(path, VHOST_BLK_FEATURES);
+	if (ret != 0) {
+		RTE_LOG(ERR, VDPA,
+			"rte_vhost_driver_set_features for %s failed.\n",
+			path);
+		goto out;
+	}
+
+	ret = rte_vhost_driver_disable_features(path,
+		VHOST_BLK_DISABLED_FEATURES);
+	if (ret != 0) {
+		RTE_LOG(ERR, VDPA,
+			"rte_vhost_driver_disable_features for %s failed.\n",
+			path);
+		goto out;
+	}
+
+	ret = rte_vhost_driver_get_protocol_features(path, &protocol_features);
+	if (ret != 0) {
+		RTE_LOG(ERR, VDPA,
+			"rte_vhost_driver_get_protocol_features for %s failed.\n",
+			path);
+		goto out;
+	}
+
+	protocol_features |= VHOST_BLK_PROTOCOL_FEATURES;
+
+	ret = rte_vhost_driver_set_protocol_features(path, protocol_features);
+	if (ret != 0) {
+		RTE_LOG(ERR, VDPA,
+			"rte_vhost_driver_set_protocol_features for %s failed.\n",
+			path);
+	}
+
+out:
+	return ret;
+}
+
+static int
 start_vdpa(struct vdpa_port *vport)
 {
+	uint32_t device_type = 0;
 	int ret;
 	char *socket_path = vport->ifname;
 
@@ -192,6 +238,16 @@ struct vdpa_port {
 			"attach vdpa device failed: %s\n",
 			socket_path);
 
+	ret = rte_vhost_driver_get_vdpa_dev_type(socket_path, &device_type);
+	if (ret == 0 && device_type == RTE_VHOST_VDPA_DEVICE_TYPE_BLK) {
+		RTE_LOG(NOTICE, VDPA, "%s is a blk device\n", socket_path);
+		ret = vdpa_blk_device_set_features_and_protocol(socket_path);
+		if (ret != 0)
+			rte_exit(EXIT_FAILURE,
+				"set vhost blk driver features and protocol features failed: %s\n",
+				socket_path);
+	}
+
 	if (rte_vhost_driver_start(socket_path) < 0)
 		rte_exit(EXIT_FAILURE,
 			"start vhost driver failed: %s\n",
diff --git a/examples/vdpa/vdpa_blk_compact.h b/examples/vdpa/vdpa_blk_compact.h
new file mode 100644
index 0000000..143548e
--- /dev/null
+++ b/examples/vdpa/vdpa_blk_compact.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Intel Corporation
+ */
+
+#ifndef _VDPA_BLK_COMPACT_H_
+#define _VDPA_BLK_COMPACT_H_
+
+#include <rte_vhost.h>
+
+/* Feature bits */
+#define VIRTIO_BLK_F_SIZE_MAX     1    /* Indicates maximum segment size */
+#define VIRTIO_BLK_F_SEG_MAX      2    /* Indicates maximum # of segments */
+#define VIRTIO_BLK_F_GEOMETRY     4    /* Legacy geometry available  */
+#define VIRTIO_BLK_F_BLK_SIZE     6    /* Block size of disk is available */
+#define VIRTIO_BLK_F_TOPOLOGY     10   /* Topology information is available */
+#define VIRTIO_BLK_F_MQ           12   /* support more than one vq */
+
+/* Legacy feature bits */
+#define VIRTIO_BLK_F_BARRIER      0    /* Does host support barriers? */
+#define VIRTIO_BLK_F_SCSI         7    /* Supports scsi command passthru */
+#define VIRTIO_BLK_F_CONFIG_WCE   11   /* Writeback mode available in config */
+
+#define VHOST_BLK_FEATURES_BASE ((1ULL << VHOST_F_LOG_ALL) | \
+	(1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
+	(1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
+	(1ULL << VIRTIO_RING_F_EVENT_IDX) | \
+	(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
+	(1ULL << VIRTIO_F_VERSION_1))
+
+#define VHOST_BLK_DISABLED_FEATURES_BASE ((1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
+	(1ULL << VIRTIO_RING_F_EVENT_IDX))
+
+#define VHOST_BLK_FEATURES (VHOST_BLK_FEATURES_BASE | \
+	(1ULL << VIRTIO_BLK_F_SIZE_MAX) | (1ULL << VIRTIO_BLK_F_SEG_MAX) | \
+	(1ULL << VIRTIO_BLK_F_GEOMETRY) | (1ULL << VIRTIO_BLK_F_BLK_SIZE) | \
+	(1ULL << VIRTIO_BLK_F_TOPOLOGY) | (1ULL << VIRTIO_BLK_F_BARRIER)  | \
+	(1ULL << VIRTIO_BLK_F_SCSI)     | (1ULL << VIRTIO_BLK_F_CONFIG_WCE) | \
+	(1ULL << VIRTIO_BLK_F_MQ))
+
+/* Not supported features */
+#define VHOST_BLK_DISABLED_FEATURES (VHOST_BLK_DISABLED_FEATURES_BASE | \
+	(1ULL << VIRTIO_BLK_F_GEOMETRY) | (1ULL << VIRTIO_BLK_F_BARRIER) | \
+	(1ULL << VIRTIO_BLK_F_SCSI)  | (1ULL << VIRTIO_BLK_F_CONFIG_WCE))
+
+/* Vhost-blk support protocol features */
+#define VHOST_BLK_PROTOCOL_FEATURES \
+	((1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD) | \
+	(1ULL << VHOST_USER_PROTOCOL_F_CONFIG))
+
+#endif /* _VDPA_BLK_COMPACT_H_ */
-- 
1.8.3.1