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When recovering after a link failure, snd_nxt should not be set to a
lower value. Else, update of snd_nxt is broken because:
msk->snd_nxt += ret; (where ret is number of bytes sent)
assumes that snd_nxt always moves forward.
After reduction, its possible that snd_nxt update gets out of sync:
dfrag we just sent might have had a data sequence number even past
recovery_snd_nxt.
This change factors the common msk state update to a helper
and updates snd_nxt based on the current dfrag data sequence number.
The conditional is required for the recovery phase where we may
re-transmit old dfrags that are before current snd_nxt.
After this change, snd_nxt only moves forward and covers all in-sequence
data that was transmitted.
recovery_snd_nxt is retained to detect when recovery has completed.
Fixes: 1e1d9d6f119c5 ("mptcp: handle pending data on closed subflow")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
0d199e4363