| 1 | /*
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| 2 | * Copyright (c) 2018 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef _VIRTIO_NET_H_
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| 30 | #define _VIRTIO_NET_H_
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| 31 |
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| 32 | #include <virtio-pci.h>
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| 33 | #include <abi/cap.h>
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| 34 | #include <nic/nic.h>
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| 35 |
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| 36 | #define RX_BUFFERS 8
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| 37 | #define TX_BUFFERS 8
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| 38 | #define CT_BUFFERS 4
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| 39 |
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| 40 | /** Device handles packets with partial checksum. */
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| 41 | #define VIRTIO_NET_F_CSUM (1U << 0)
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| 42 | /** Driver handles packets with partial checksum. */
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| 43 | #define VIRTIO_NET_F_GUEST_CSUM (1U << 2)
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| 44 | /** Device has given MAC address. */
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| 45 | #define VIRTIO_NET_F_MAC (1U << 5)
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| 46 | /** Control channel is available */
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| 47 | #define VIRTIO_NET_F_CTRL_VQ (1U << 17)
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| 48 |
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| 49 | #define VIRTIO_NET_HDR_GSO_NONE 0
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| 50 | typedef struct {
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| 51 | uint8_t flags;
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| 52 | uint8_t gso_type;
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| 53 | uint16_t hdr_len;
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| 54 | uint16_t gso_size;
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| 55 | uint16_t csum_start;
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| 56 | uint16_t csum_offset;
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| 57 | // XXX: QEMU uses the legacy layout for some reason
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| 58 | // uint16_t num_buffers;
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| 59 | } virtio_net_hdr_t;
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| 60 |
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| 61 | typedef struct {
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| 62 | uint8_t mac[ETH_ADDR];
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| 63 | } virtio_net_cfg_t;
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| 64 |
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| 65 | typedef struct {
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| 66 | virtio_dev_t virtio_dev;
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| 67 | void *rx_buf[RX_BUFFERS];
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| 68 | uintptr_t rx_buf_p[RX_BUFFERS];
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| 69 | void *tx_buf[TX_BUFFERS];
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| 70 | uintptr_t tx_buf_p[TX_BUFFERS];
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| 71 | void *ct_buf[CT_BUFFERS];
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| 72 | uintptr_t ct_buf_p[CT_BUFFERS];
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| 73 |
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| 74 | uint16_t tx_free_head;
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| 75 | uint16_t ct_free_head;
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| 76 |
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| 77 | int irq;
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| 78 | cap_irq_handle_t irq_handle;
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| 79 | } virtio_net_t;
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| 80 |
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| 81 | #endif
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