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fd2a0437dc
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>
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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#include <linux/if_vlan.h>
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#include <uapi/linux/virtio_net.h>
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static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
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const struct virtio_net_hdr *hdr,
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bool little_endian)
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{
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unsigned short gso_type = 0;
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if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
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switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
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case VIRTIO_NET_HDR_GSO_TCPV4:
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gso_type = SKB_GSO_TCPV4;
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break;
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case VIRTIO_NET_HDR_GSO_TCPV6:
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gso_type = SKB_GSO_TCPV6;
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break;
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case VIRTIO_NET_HDR_GSO_UDP:
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gso_type = SKB_GSO_UDP;
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break;
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default:
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return -EINVAL;
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}
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if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
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gso_type |= SKB_GSO_TCP_ECN;
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if (hdr->gso_size == 0)
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return -EINVAL;
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}
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if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
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u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start);
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u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);
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if (!skb_partial_csum_set(skb, start, off))
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return -EINVAL;
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}
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if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
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u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
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skb_shinfo(skb)->gso_size = gso_size;
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skb_shinfo(skb)->gso_type = gso_type;
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/* Header must be checked, and gso_segs computed. */
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skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
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skb_shinfo(skb)->gso_segs = 0;
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}
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return 0;
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}
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static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
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struct virtio_net_hdr *hdr,
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bool little_endian)
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{
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memset(hdr, 0, sizeof(*hdr));
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if (skb_is_gso(skb)) {
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struct skb_shared_info *sinfo = skb_shinfo(skb);
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/* This is a hint as to how much should be linear. */
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hdr->hdr_len = __cpu_to_virtio16(little_endian,
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skb_headlen(skb));
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hdr->gso_size = __cpu_to_virtio16(little_endian,
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sinfo->gso_size);
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if (sinfo->gso_type & SKB_GSO_TCPV4)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
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else if (sinfo->gso_type & SKB_GSO_TCPV6)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
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else if (sinfo->gso_type & SKB_GSO_UDP)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
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else
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return -EINVAL;
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if (sinfo->gso_type & SKB_GSO_TCP_ECN)
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hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
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} else
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hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
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if (skb_vlan_tag_present(skb))
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hdr->csum_start = __cpu_to_virtio16(little_endian,
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skb_checksum_start_offset(skb) + VLAN_HLEN);
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else
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hdr->csum_start = __cpu_to_virtio16(little_endian,
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skb_checksum_start_offset(skb));
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hdr->csum_offset = __cpu_to_virtio16(little_endian,
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skb->csum_offset);
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} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
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hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
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} /* else everything is zero */
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return 0;
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}
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#endif /* _LINUX_VIRTIO_BYTEORDER */
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