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296f96fcfc
The network driver uses two virtqueues: one for input packets and one for output packets. This has nice locking properties (ie. we don't do any for recv vs send). TODO: 1) Big packets. 2) Multi-client devices (maybe separate driver?). 3) Resolve freeing of old xmit skbs (Christian Borntraeger) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: netdev@vger.kernel.org
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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#include <linux/virtio_config.h>
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/* The ID for virtio_net */
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#define VIRTIO_ID_NET 1
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/* The bitmap of config for virtio net */
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#define VIRTIO_CONFIG_NET_F 0x40
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#define VIRTIO_NET_F_NO_CSUM 0
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#define VIRTIO_NET_F_TSO4 1
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#define VIRTIO_NET_F_UFO 2
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#define VIRTIO_NET_F_TSO4_ECN 3
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#define VIRTIO_NET_F_TSO6 4
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/* The config defining mac address. */
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#define VIRTIO_CONFIG_NET_MAC_F 0x41
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/* This is the first element of the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header. */
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struct virtio_net_hdr
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{
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
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__u8 flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
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#define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
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/* FIXME: Do we need this? If they said they can handle ECN, do they care? */
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#define VIRTIO_NET_HDR_GSO_TCPV4_ECN 2 // GSO frame, IPv4 TCP w/ ECN
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#define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
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#define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
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__u8 gso_type;
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__u16 gso_size;
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__u16 csum_start;
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__u16 csum_offset;
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};
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#endif /* _LINUX_VIRTIO_NET_H */
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