[RFC 1/2] linux-headers: add virtio_can.h

[Matias Ezequiel Vara Larsen <mvaralar@redhat.com>]

Signed-off-by: Matias Ezequiel Vara Larsen <mvaralar@redhat.com>
---
Note that virtio_can.h is not merged yet and it is part of the series
https://lore.kernel.org/all/aQJRnX7OpFRY%2F1+H@fedora/
---
 include/standard-headers/linux/virtio_can.h | 78 +++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 include/standard-headers/linux/virtio_can.h

diff --git a/include/standard-headers/linux/virtio_can.h b/include/standard-headers/linux/virtio_can.h
new file mode 100644
index 0000000000..6380ef7bce
--- /dev/null
+++ b/include/standard-headers/linux/virtio_can.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (C) 2021-2023 OpenSynergy GmbH
+ * Copyright Red Hat, Inc. 2025
+ */
+#ifndef _LINUX_VIRTIO_VIRTIO_CAN_H
+#define _LINUX_VIRTIO_VIRTIO_CAN_H
+
+#include <standard-headers/linux/types.h>
+#include <standard-headers/linux/virtio_types.h>
+#include <standard-headers/linux/virtio_ids.h>
+#include <standard-headers/linux/virtio_config.h>
+
+/* Feature bit numbers */
+#define VIRTIO_CAN_F_CAN_CLASSIC        0
+#define VIRTIO_CAN_F_CAN_FD             1
+#define VIRTIO_CAN_F_RTR_FRAMES         2
+#define VIRTIO_CAN_F_LATE_TX_ACK        3
+
+/* CAN Result Types */
+#define VIRTIO_CAN_RESULT_OK            0
+#define VIRTIO_CAN_RESULT_NOT_OK        1
+
+/* CAN flags to determine type of CAN Id */
+#define VIRTIO_CAN_FLAGS_EXTENDED       0x8000
+#define VIRTIO_CAN_FLAGS_FD             0x4000
+#define VIRTIO_CAN_FLAGS_RTR            0x2000
+
+#define VIRTIO_CAN_MAX_DLEN    64 // this is like CANFD_MAX_DLEN
+
+struct virtio_can_config {
+#define VIRTIO_CAN_S_CTRL_BUSOFF (1u << 0) /* Controller BusOff */
+	/* CAN controller status */
+	__le16 status;
+};
+
+/* TX queue message types */
+struct virtio_can_tx_out {
+#define VIRTIO_CAN_TX                   0x0001
+	__le16 msg_type;
+	__le16 length; /* 0..8 CC, 0..64 CAN-FD, 0..2048 CAN-XL, 12 bits */
+	__u8 reserved_classic_dlc; /* If CAN classic length = 8 then DLC can be 8..15 */
+	__u8 padding;
+	__le16 reserved_xl_priority; /* May be needed for CAN XL priority */
+	__le32 flags;
+	__le32 can_id;
+	__u8 sdu[] __counted_by(length);
+};
+
+struct virtio_can_tx_in {
+	__u8 result;
+};
+
+/* RX queue message types */
+struct virtio_can_rx {
+#define VIRTIO_CAN_RX                   0x0101
+	__le16 msg_type;
+	__le16 length; /* 0..8 CC, 0..64 CAN-FD, 0..2048 CAN-XL, 12 bits */
+	__u8 reserved_classic_dlc; /* If CAN classic length = 8 then DLC can be 8..15 */
+	__u8 padding;
+	__le16 reserved_xl_priority; /* May be needed for CAN XL priority */
+	__le32 flags;
+	__le32 can_id;
+	__u8 sdu[] __counted_by(length);
+};
+
+/* Control queue message types */
+struct virtio_can_control_out {
+#define VIRTIO_CAN_SET_CTRL_MODE_START  0x0201
+#define VIRTIO_CAN_SET_CTRL_MODE_STOP   0x0202
+	__le16 msg_type;
+};
+
+struct virtio_can_control_in {
+	__u8 result;
+};
+
+#endif /* #ifndef _LINUX_VIRTIO_VIRTIO_CAN_H */
-- 
2.42.0