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net: introduce sk_forward_alloc_get()
A later patch will change the MPTCP memory accounting schema in such a way that MPTCP sockets will encode the total amount of forward allocated memory in two separate fields (one for tx and one for rx). MPTCP sockets will use their own helper to provide the accurate amount of fwd allocated memory. To allow the above, this patch adds a new, optional, sk method to fetch the fwd memory, wrap the call in a new helper and use it where it is appropriate. Signed-off-by: Paolo Abeni <[email protected]> Signed-off-by: Mat Martineau <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]>
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