ila: cleanup checksum diff
Consolidate computing checksum diff into one function. Add get_csum_diff_iaddr that computes the checksum diff between an address argument and locator being written. get_csum_diff calls this using the destination address in the IP header as the argument. Also moved ila_init_saved_csum to be close to the checksum diff functions. Signed-off-by: Tom Herbert <tom@quantonium.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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