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There was no proper implementation of TCP segmentation before this change, and net_tx_pkt relied solely on IPv4 fragmentation. Not only this is not aligned with the specification, but it also resulted in corrupted IPv6 packets. This is particularly problematic for the igb, a new proposed device implementation; igb provides loopback feature for VMDq and the feature relies on software segmentation. Implement proper TCP segmentation in net_tx_pkt to fix such a scenario. Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com> Signed-off-by: Jason Wang <jasowang@redhat.com>