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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2009-02-27 22:38:28 +0000
committerDavid S. Miller <davem@davemloft.net>2009-03-02 03:07:23 -0800
commit361a5c1dd0bd7bb2b90e7fe9127b366d3566522e (patch)
tree440150dfa03f976d4ef6d3062744f2185373820d /fs/btrfs
parent9ce01461028d595a6f1cd724fbd7a0dd70464fe4 (diff)
dccp: Minimise header option overhead in setting the MPS
This patch resolves a long-standing FIXME to dynamically update the Maximum Packet Size depending on actual options usage. It uses the flags set by the feature-negotiation infrastructure to compute the required header option size. Most options are fixed-size, a notable exception are Ack Vectors (required currently only by CCID-2). These can have any length between 3 and 1020 bytes. As a result of testing, 16 bytes (2 bytes for type/length plus 14 Ack Vector cells) have been found to be sufficient for loss-free situations. There are currently no CCID-specific header options which may appear on data packets, thus it is not necessary to define a corresponding CCID field as suggested in the old comment. Further changes: ---------------- Adjusted the type of 'cur_mps' to match the unsigned return type of the function. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
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