sfc: remove Software TSO
It gives no advantage over GSO now that xmit_more exists. If we find ourselves unable to handle a TSO skb (because our TXQ doesn't have a TSOv2 context and the NIC doesn't support TSOv1), hand it back to GSO. Also do that if the TSO handler fails with EINVAL for any other reason. As Falcon-architecture NICs don't support any firmware-assisted TSO, they no longer advertise TSO feature flags at all. Signed-off-by: Edward Cree <ecree@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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