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virtio_net: introduce virtio_net_hdr_{from,to}_skb
The code for conversion between virtio_net_hdr and skb GSO info is duplicated at several places. Let's put it to a common place to allow reuse. Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Mike Rapoport
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David S. Miller
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Jun 11, 2016
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| #ifndef _LINUX_VIRTIO_NET_H | ||
| #define _LINUX_VIRTIO_NET_H | ||
|
|
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| #include <linux/if_vlan.h> | ||
| #include <uapi/linux/virtio_net.h> | ||
|
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| static inline int virtio_net_hdr_to_skb(struct sk_buff *skb, | ||
| const struct virtio_net_hdr *hdr, | ||
| bool little_endian) | ||
| { | ||
| unsigned short gso_type = 0; | ||
|
|
||
| if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | ||
| switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | ||
| case VIRTIO_NET_HDR_GSO_TCPV4: | ||
| gso_type = SKB_GSO_TCPV4; | ||
| break; | ||
| case VIRTIO_NET_HDR_GSO_TCPV6: | ||
| gso_type = SKB_GSO_TCPV6; | ||
| break; | ||
| case VIRTIO_NET_HDR_GSO_UDP: | ||
| gso_type = SKB_GSO_UDP; | ||
| break; | ||
| default: | ||
| return -EINVAL; | ||
| } | ||
|
|
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| if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | ||
| gso_type |= SKB_GSO_TCP_ECN; | ||
|
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| if (hdr->gso_size == 0) | ||
| return -EINVAL; | ||
| } | ||
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| if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | ||
| u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start); | ||
| u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset); | ||
|
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||
| if (!skb_partial_csum_set(skb, start, off)) | ||
| return -EINVAL; | ||
| } | ||
|
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| if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | ||
| u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size); | ||
|
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| skb_shinfo(skb)->gso_size = gso_size; | ||
| skb_shinfo(skb)->gso_type = gso_type; | ||
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| /* Header must be checked, and gso_segs computed. */ | ||
| skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | ||
| skb_shinfo(skb)->gso_segs = 0; | ||
| } | ||
|
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||
| return 0; | ||
| } | ||
|
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| static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb, | ||
| struct virtio_net_hdr *hdr, | ||
| bool little_endian) | ||
| { | ||
| memset(hdr, 0, sizeof(*hdr)); | ||
|
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| if (skb_is_gso(skb)) { | ||
| struct skb_shared_info *sinfo = skb_shinfo(skb); | ||
|
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| /* This is a hint as to how much should be linear. */ | ||
| hdr->hdr_len = __cpu_to_virtio16(little_endian, | ||
| skb_headlen(skb)); | ||
| hdr->gso_size = __cpu_to_virtio16(little_endian, | ||
| sinfo->gso_size); | ||
| if (sinfo->gso_type & SKB_GSO_TCPV4) | ||
| hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | ||
| else if (sinfo->gso_type & SKB_GSO_TCPV6) | ||
| hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | ||
| else if (sinfo->gso_type & SKB_GSO_UDP) | ||
| hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | ||
| else | ||
| return -EINVAL; | ||
| if (sinfo->gso_type & SKB_GSO_TCP_ECN) | ||
| hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | ||
| } else | ||
| hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | ||
|
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||
| if (skb->ip_summed == CHECKSUM_PARTIAL) { | ||
| hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | ||
| if (skb_vlan_tag_present(skb)) | ||
| hdr->csum_start = __cpu_to_virtio16(little_endian, | ||
| skb_checksum_start_offset(skb) + VLAN_HLEN); | ||
| else | ||
| hdr->csum_start = __cpu_to_virtio16(little_endian, | ||
| skb_checksum_start_offset(skb)); | ||
| hdr->csum_offset = __cpu_to_virtio16(little_endian, | ||
| skb->csum_offset); | ||
| } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { | ||
| hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | ||
| } /* else everything is zero */ | ||
|
|
||
| return 0; | ||
| } | ||
|
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| #endif /* _LINUX_VIRTIO_BYTEORDER */ |