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after act_csum computes the checksum on skbs carrying GSO TCP/UDP packets,
subsequent segmentation fails because skb_needs_check(skb, true) returns
true. Because of that, skb_warn_bad_offload() is invoked and the following
message is displayed:
WARNING: CPU: 3 PID: 28 at net/core/dev.c:2553 skb_warn_bad_offload+0xf0/0xfd
<...>
[<ffffffff8171f486>] skb_warn_bad_offload+0xf0/0xfd
[<ffffffff8161304c>] __skb_gso_segment+0xec/0x110
[<ffffffff8161340d>] validate_xmit_skb+0x12d/0x2b0
[<ffffffff816135d2>] validate_xmit_skb_list+0x42/0x70
[<ffffffff8163c560>] sch_direct_xmit+0xd0/0x1b0
[<ffffffff8163c760>] __qdisc_run+0x120/0x270
[<ffffffff81613b3d>] __dev_queue_xmit+0x23d/0x690
[<ffffffff81613fa0>] dev_queue_xmit+0x10/0x20
Since GSO is able to compute checksum on individual segments of such skbs,
we can simply skip mangling the packet.
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
add641e7de