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In case of xfrm offload, if xdo_dev_state_add() of driver returns
-EOPNOTSUPP, xfrm offload fallback is failed.
In xfrm state_add() both xso->dev and xso->real_dev are initialized to
dev and when err(-EOPNOTSUPP) is returned only xso->dev is set to null.
So in this scenario the condition in func validate_xmit_xfrm(),
if ((x->xso.dev != dev) && (x->xso.real_dev == dev))
return skb;
returns true, due to which skb is returned without calling esp_xmit()
below which has fallback code. Hence the CRYPTO_FALLBACK is failing.
So fixing this with by keeping x->xso.real_dev as NULL when err is
returned in func xfrm_dev_state_add().
Fixes: bdfd2d1fa7 ("bonding/xfrm: use real_dev instead of slave_dev")
Signed-off-by: Ayush Sawal <ayush.sawal@chelsio.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
dd72fadf21