e1000e: Perform software segmentation for loopback

e1000e didn't perform software segmentation for loopback if virtio-net
header is enabled, which is wrong.

To fix the problem, introduce net_tx_pkt_send_custom(), which allows the
caller to specify whether offloading should be assumed or not.

net_tx_pkt_send_custom() also allows the caller to provide a custom
sending function. Packets with virtio-net headers and ones without
virtio-net headers will be provided at the same time so the function
can choose the preferred version. In case of e1000e loopback, it prefers
to have virtio-net headers as they allows to skip the checksum
verification if VIRTIO_NET_HDR_F_DATA_VALID is set.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/hw/net/net_rx_pkt.h b/hw/net/net_rx_pkt.h
index 7277907a22..8b69ddb2da 100644
--- a/hw/net/net_rx_pkt.h
+++ b/hw/net/net_rx_pkt.h
@@ -313,6 +313,14 @@ void net_rx_pkt_set_vhdr_iovec(struct NetRxPkt *pkt,
     const struct iovec *iov, int iovcnt);
 
 /**
+ * unset vhdr data from packet context
+ *
+ * @pkt:            packet
+ *
+ */
+void net_rx_pkt_unset_vhdr(struct NetRxPkt *pkt);
+
+/**
  * save packet type in packet context
  *
  * @pkt:            packet