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@xxxxxxxxxxxxxxxxxx>
---
include/linux/virtio_net.h | 101 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)
create mode 100644 include/linux/virtio_net.h
diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
new file mode 100644
index 0000000..1c912f8
--- /dev/null
+++ b/include/linux/virtio_net.h
@@ -0,0 +1,101 @@
+#ifndef _LINUX_VIRTIO_NET_H
+#define _LINUX_VIRTIO_NET_H
+
+#include <linux/if_vlan.h>
+#include <uapi/linux/virtio_net.h>
+
+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;
+ }
+
+ if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
+ gso_type |= SKB_GSO_TCP_ECN;
+
+ if (hdr->gso_size == 0)
+ return -EINVAL;
+ }
+
+ 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);
+
+ if (!skb_partial_csum_set(skb, start, off))
+ return -EINVAL;
+ }
+
+ if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
+
+ skb_shinfo(skb)->gso_size = gso_size;
+ skb_shinfo(skb)->gso_type = gso_type;
+
+ /* Header must be checked, and gso_segs computed. */
+ skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
+ skb_shinfo(skb)->gso_segs = 0;
+ }
+
+ return 0;
+}
+
+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));
+
+ if (skb_is_gso(skb)) {
+ struct skb_shared_info *sinfo = skb_shinfo(skb);
+
+ /* 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;
+
+ 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;
+}
+
+#endif /* _LINUX_VIRTIO_BYTEORDER */
--
1.9.1
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