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1 /* |
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2 * Virtio Network Device |
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3 * |
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4 * Copyright IBM, Corp. 2007 |
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5 * |
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6 * Authors: |
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7 * Anthony Liguori <aliguori@us.ibm.com> |
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8 * |
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9 * This work is licensed under the terms of the GNU GPL, version 2. See |
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10 * the COPYING file in the top-level directory. |
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11 * |
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12 */ |
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13 |
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14 #ifndef _QEMU_VIRTIO_NET_H |
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15 #define _QEMU_VIRTIO_NET_H |
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16 |
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17 #include "virtio.h" |
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18 #include "net.h" |
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19 |
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20 /* from Linux's virtio_net.h */ |
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21 |
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22 /* The ID for virtio_net */ |
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23 #define VIRTIO_ID_NET 1 |
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24 |
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25 /* The feature bitmap for virtio net */ |
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26 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ |
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27 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ |
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28 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ |
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29 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ |
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30 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ |
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31 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ |
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32 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ |
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33 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ |
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34 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ |
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35 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ |
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36 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ |
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37 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ |
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38 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ |
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39 |
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40 #define TX_TIMER_INTERVAL 150000 /* 150 us */ |
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41 |
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42 /* Maximum packet size we can receive from tap device: header + 64k */ |
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43 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10)) |
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44 |
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45 /* The config defining mac address (6 bytes) */ |
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46 struct virtio_net_config |
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47 { |
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48 uint8_t mac[6]; |
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49 } __attribute__((packed)); |
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50 |
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51 /* This is the first element of the scatter-gather list. If you don't |
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52 * specify GSO or CSUM features, you can simply ignore the header. */ |
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53 struct virtio_net_hdr |
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54 { |
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55 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset |
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56 uint8_t flags; |
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57 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame |
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58 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) |
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59 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) |
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60 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP |
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61 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set |
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62 uint8_t gso_type; |
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63 uint16_t hdr_len; |
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64 uint16_t gso_size; |
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65 uint16_t csum_start; |
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66 uint16_t csum_offset; |
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67 }; |
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68 |
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69 /* This is the version of the header to use when the MRG_RXBUF |
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70 * feature has been negotiated. */ |
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71 struct virtio_net_hdr_mrg_rxbuf |
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72 { |
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73 struct virtio_net_hdr hdr; |
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74 uint16_t num_buffers; /* Number of merged rx buffers */ |
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75 }; |
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76 |
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77 void virtio_net_init(VirtIOBindFn bind, void *bind_arg, NICInfo *nd); |
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78 |
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79 #endif |