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| -rw-r--r-- | src/seastar/include/seastar/net/virtio-interface.hh | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/seastar/include/seastar/net/virtio-interface.hh b/src/seastar/include/seastar/net/virtio-interface.hh new file mode 100644 index 000000000..367806f01 --- /dev/null +++ b/src/seastar/include/seastar/net/virtio-interface.hh @@ -0,0 +1,131 @@ +/* + * This file is open source software, licensed to you under the terms + * of the Apache License, Version 2.0 (the "License"). See the NOTICE file + * distributed with this work for additional information regarding copyright + * ownership. You may not use this file except in compliance with the License. + * + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +/* + * Copyright (C) 2014 Cloudius Systems, Ltd. + * + */ + +#pragma once + +#ifndef _LINUX_VIRTIO_RING_H +#define _LINUX_VIRTIO_RING_H + +/* An interface for efficient virtio implementation, currently for use by KVM + * and lguest, but hopefully others soon. Do NOT change this since it will + * break existing servers and clients. + * + * This header is BSD licensed so anyone can use the definitions to implement + * compatible drivers/servers. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. Neither the name of IBM 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 IBM 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. + * + * Copyright Rusty Russell IBM Corporation 2007. */ + +/* This marks a buffer as continuing via the next field. */ +#define VRING_DESC_F_NEXT 1 +/* This marks a buffer as write-only (otherwise read-only). */ +#define VRING_DESC_F_WRITE 2 +/* This means the buffer contains a list of buffer descriptors. */ +#define VRING_DESC_F_INDIRECT 4 + +/* The Host uses this in used->flags to advise the Guest: don't kick me when + * you add a buffer. It's unreliable, so it's simply an optimization. Guest + * will still kick if it's out of buffers. */ +#define VRING_USED_F_NO_NOTIFY 1 +/* The Guest uses this in avail->flags to advise the Host: don't interrupt me + * when you consume a buffer. It's unreliable, so it's simply an + * optimization. */ +#define VRING_AVAIL_F_NO_INTERRUPT 1 + +/* We support indirect buffer descriptors */ +#define VIRTIO_RING_F_INDIRECT_DESC (1 << 28) + +/* The Guest publishes the used index for which it expects an interrupt + * at the end of the avail ring. Host should ignore the avail->flags field. */ +/* The Host publishes the avail index for which it expects a kick + * at the end of the used ring. Guest should ignore the used->flags field. */ +#define VIRTIO_RING_F_EVENT_IDX (1 << 29) + +/* The standard layout for the ring is a continuous chunk of memory which looks + * like this. We assume num is a power of 2. + * + * struct vring + * { + * // The actual descriptors (16 bytes each) + * struct vring_desc desc[num]; + * + * // A ring of available descriptor heads with free-running index. + * uint16_t avail_flags; + * uint16_t avail_idx; + * uint16_t available[num]; + * uint16_t used_event_idx; + * + * // Padding to the next align boundary. + * char pad[]; + * + * // A ring of used descriptor heads with free-running index. + * uint16_t used_flags; + * uint16_t used_idx; + * struct vring_used_elem used[num]; + * uint16_t avail_event_idx; + * }; + */ + +#endif + +#define VIRTIO_NET_F_CSUM (1 << 0) +#define VIRTIO_NET_F_GUEST_CSUM (1 << 1) +#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS (1 << 2) +#define VIRTIO_NET_F_MAC (1 << 5) +#define VIRTIO_NET_F_GUEST_TSO4 (1 << 7) +#define VIRTIO_NET_F_GUEST_TSO6 (1 << 8) +#define VIRTIO_NET_F_GUEST_ECN (1 << 9) +#define VIRTIO_NET_F_GUEST_UFO (1 << 10) +#define VIRTIO_NET_F_HOST_TSO4 (1 << 11) +#define VIRTIO_NET_F_HOST_TSO6 (1 << 12) +#define VIRTIO_NET_F_HOST_ECN (1 << 13) +#define VIRTIO_NET_F_HOST_UFO (1 << 14) +#define VIRTIO_NET_F_MRG_RXBUF (1 << 15) +#define VIRTIO_NET_F_STATUS (1 << 16) +#define VIRTIO_NET_F_CTRL_VQ (1 << 17) +#define VIRTIO_NET_F_CTRL_RX (1 << 18) +#define VIRTIO_NET_F_CTRL_VLAN (1 << 19) +#define VIRTIO_NET_F_GUEST_ANNOUNCE (1 << 21) +#define VIRTIO_NET_F_MQ (1 << 22) +#define VIRTIO_NET_F_CTRL_MAC_ADDR (1 << 23) |