[dpdk-dev] [PATCH v5 2/8] crypto/bcmfs: add vfio support

[Vikas Gupta <vikas.gupta@broadcom.com>]

Add VFIO support for BCMFS PMD.
The BCMFS PMD functionality is dependent on the VFIO_PRESENT flag,
which gets enabled in the rte_vfio.h.
If this flag is not enabled in the compiling platform driver will
silently return with error, when executed.

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
---
 drivers/crypto/bcmfs/bcmfs_device.c |   5 ++
 drivers/crypto/bcmfs/bcmfs_device.h |   6 ++
 drivers/crypto/bcmfs/bcmfs_vfio.c   | 107 ++++++++++++++++++++++++++++
 drivers/crypto/bcmfs/bcmfs_vfio.h   |  17 +++++
 drivers/crypto/bcmfs/meson.build    |   3 +-
 5 files changed, 137 insertions(+), 1 deletion(-)
 create mode 100644 drivers/crypto/bcmfs/bcmfs_vfio.c
 create mode 100644 drivers/crypto/bcmfs/bcmfs_vfio.h

diff --git a/drivers/crypto/bcmfs/bcmfs_device.c b/drivers/crypto/bcmfs/bcmfs_device.c
index f1050ff112..0ccddea202 100644
--- a/drivers/crypto/bcmfs/bcmfs_device.c
+++ b/drivers/crypto/bcmfs/bcmfs_device.c
@@ -12,6 +12,7 @@
 
 #include "bcmfs_device.h"
 #include "bcmfs_logs.h"
+#include "bcmfs_vfio.h"
 
 struct bcmfs_device_attr {
 	const char name[BCMFS_MAX_PATH_LEN];
@@ -72,6 +73,10 @@ fsdev_allocate_one_dev(struct rte_vdev_device *vdev,
 
 	fsdev->vdev = vdev;
 
+	/* attach to VFIO */
+	if (bcmfs_attach_vfio(fsdev))
+		goto cleanup;
+
 	TAILQ_INSERT_TAIL(&fsdev_list, fsdev, next);
 
 	return fsdev;
diff --git a/drivers/crypto/bcmfs/bcmfs_device.h b/drivers/crypto/bcmfs/bcmfs_device.h
index 1a4d0cf365..f99d57d4bd 100644
--- a/drivers/crypto/bcmfs/bcmfs_device.h
+++ b/drivers/crypto/bcmfs/bcmfs_device.h
@@ -38,6 +38,12 @@ struct bcmfs_device {
 	char name[BCMFS_DEV_NAME_LEN];
 	/* Parent vdev */
 	struct rte_vdev_device *vdev;
+	/* vfio handle */
+	int vfio_dev_fd;
+	/* mapped address */
+	uint8_t *mmap_addr;
+	/* mapped size */
+	uint32_t mmap_size;
 };
 
 #endif /* _BCMFS_DEVICE_H_ */
diff --git a/drivers/crypto/bcmfs/bcmfs_vfio.c b/drivers/crypto/bcmfs/bcmfs_vfio.c
new file mode 100644
index 0000000000..dc2def580f
--- /dev/null
+++ b/drivers/crypto/bcmfs/bcmfs_vfio.c
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2020 Broadcom.
+ * All rights reserved.
+ */
+
+#include <errno.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
+#include <rte_vfio.h>
+
+#include "bcmfs_device.h"
+#include "bcmfs_logs.h"
+#include "bcmfs_vfio.h"
+
+#ifdef VFIO_PRESENT
+static int
+vfio_map_dev_obj(const char *path, const char *dev_obj,
+		 uint32_t *size, void **addr, int *dev_fd)
+{
+	int32_t ret;
+	struct vfio_group_status status = { .argsz = sizeof(status) };
+
+	struct vfio_device_info d_info = { .argsz = sizeof(d_info) };
+	struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
+
+	ret = rte_vfio_setup_device(path, dev_obj, dev_fd, &d_info);
+	if (ret) {
+		BCMFS_LOG(ERR, "VFIO Setting for device failed");
+		return ret;
+	}
+
+	/* getting device region info*/
+	ret = ioctl(*dev_fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
+	if (ret < 0) {
+		BCMFS_LOG(ERR, "Error in VFIO getting REGION_INFO");
+		goto map_failed;
+	}
+
+	*addr = mmap(NULL, reg_info.size,
+		     PROT_WRITE | PROT_READ, MAP_SHARED,
+		     *dev_fd, reg_info.offset);
+	if (*addr == MAP_FAILED) {
+		BCMFS_LOG(ERR, "Error mapping region (errno = %d)", errno);
+		ret = errno;
+		goto map_failed;
+	}
+	*size = reg_info.size;
+
+	return 0;
+
+map_failed:
+	rte_vfio_release_device(path, dev_obj, *dev_fd);
+
+	return ret;
+}
+
+int
+bcmfs_attach_vfio(struct bcmfs_device *dev)
+{
+	int ret;
+	int vfio_dev_fd;
+	void  *v_addr = NULL;
+	uint32_t size = 0;
+
+	ret = vfio_map_dev_obj(dev->dirname, dev->name,
+			       &size, &v_addr, &vfio_dev_fd);
+	if (ret)
+		return -1;
+
+	dev->mmap_size = size;
+	dev->mmap_addr = v_addr;
+	dev->vfio_dev_fd = vfio_dev_fd;
+
+	return 0;
+}
+
+void
+bcmfs_release_vfio(struct bcmfs_device *dev)
+{
+	int ret;
+
+	if (dev == NULL)
+		return;
+
+	/* unmap the addr */
+	munmap(dev->mmap_addr, dev->mmap_size);
+	/* release the device */
+	ret = rte_vfio_release_device(dev->dirname, dev->name,
+				      dev->vfio_dev_fd);
+	if (ret < 0) {
+		BCMFS_LOG(ERR, "cannot release device");
+		return;
+	}
+}
+#else
+int
+bcmfs_attach_vfio(struct bcmfs_device *dev __rte_unused)
+{
+	return -1;
+}
+
+void
+bcmfs_release_vfio(struct bcmfs_device *dev __rte_unused)
+{
+}
+#endif
diff --git a/drivers/crypto/bcmfs/bcmfs_vfio.h b/drivers/crypto/bcmfs/bcmfs_vfio.h
new file mode 100644
index 0000000000..d0fdf6483f
--- /dev/null
+++ b/drivers/crypto/bcmfs/bcmfs_vfio.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Broadcom
+ * All rights reserved.
+ */
+
+#ifndef _BCMFS_VFIO_H_
+#define _BCMFS_VFIO_H_
+
+/* Attach the bcmfs device to vfio */
+int
+bcmfs_attach_vfio(struct bcmfs_device *dev);
+
+/* Release the bcmfs device from vfio */
+void
+bcmfs_release_vfio(struct bcmfs_device *dev);
+
+#endif /* _BCMFS_VFIO_H_ */
diff --git a/drivers/crypto/bcmfs/meson.build b/drivers/crypto/bcmfs/meson.build
index a4bdd8ee5d..fd39eba20e 100644
--- a/drivers/crypto/bcmfs/meson.build
+++ b/drivers/crypto/bcmfs/meson.build
@@ -6,5 +6,6 @@
 deps += ['eal', 'bus_vdev']
 sources = files(
 		'bcmfs_logs.c',
-		'bcmfs_device.c'
+		'bcmfs_device.c',
+		'bcmfs_vfio.c'
 		)
-- 
2.17.1