Ilan Tayari 7ab89b176b gso: Validate assumption of frag_list segementation
[ Upstream commit 43170c4e0ba709c79130c3fe5a41e66279950cd0 ]

Commit 07b26c9454a2 ("gso: Support partial splitting at the frag_list
pointer") assumes that all SKBs in a frag_list (except maybe the last
one) contain the same amount of GSO payload.

This assumption is not always correct, resulting in the following
warning message in the log:
    skb_segment: too many frags

For example, mlx5 driver in Striding RQ mode creates some RX SKBs with
one frag, and some with 2 frags.
After GRO, the frag_list SKBs end up having different amounts of payload.
If this frag_list SKB is then forwarded, the aforementioned assumption
is violated.

Validate the assumption, and fall back to software GSO if it not true.

Change-Id: Ia03983f4a47b6534dd987d7a2aad96d54d46d212
Fixes: 07b26c9454a2 ("gso: Support partial splitting at the frag_list pointer")
Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-05-03 08:36:36 -07:00
..
2016-10-20 14:32:22 -04:00
2016-12-05 14:48:48 -05:00
2016-12-03 23:54:25 -05:00
2016-07-05 14:08:47 -07:00
2016-05-29 22:33:25 -07:00
2016-10-20 11:23:08 -04:00
2016-12-02 14:03:20 -05:00
2016-06-09 23:41:03 -07:00
2016-08-17 19:36:23 -04:00
2016-08-17 19:36:23 -04:00