net/mlx5e: Count full skb length in TSO byte counters

net/mlx5e: Count full skb length in TSO byte counters

The tso_bytes and tso_inner_bytes counters currently subtract the header
length from skb->len, counting only the payload. This is confusing and
doesn't align with the behavior of other _bytes counters in the driver.

Report the full skb length to align with this expectation.

This also makes our behavior consistent with the netdev stats API and
virtio spec definition.

Signed-off-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260504183704.272322-2-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>