net/bonding: Implement ndo_sk_get_lower_dev
Add ndo_sk_get_lower_dev() implementation for bond interfaces. Support only for the cases where the socket's and SKBs' hash yields identical value for the whole connection lifetime. Here we restrict it to L3+4 sockets only, with xmit_hash_policy==LAYER34 and bond modes xor/802.3ad. Signed-off-by: Tariq Toukan <tariqt@nvidia.com> Reviewed-by: Boris Pismenny <borisp@nvidia.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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