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sctp: reduce memory footprint of sctp_chunk structure

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sctp_chunks should be put on a diet.  This is some of the low hanging
fruit that we can strip out.  Changes all the __s8/__u8 flags to
bitfields.  Saves 12 bytes per chunk.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Neil Horman
2008-07-25 12:44:09 -04:00
committed by Vlad Yasevich
parent 845b8eda4d
commit c226ef9b83
4 changed files with 26 additions and 23 deletions
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include/net/sctp/structs.h
+17 -14
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@@ -731,20 +731,23 @@ struct sctp_chunk {
*/
struct sk_buff *auth_chunk;
__u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */
__u8 resent; /* Has this chunk ever been retransmitted. */
__u8 has_tsn; /* Does this chunk have a TSN yet? */
__u8 has_ssn; /* Does this chunk have a SSN yet? */
__u8 singleton; /* Was this the only chunk in the packet? */
__u8 end_of_packet; /* Was this the last chunk in the packet? */
__u8 ecn_ce_done; /* Have we processed the ECN CE bit? */
__u8 pdiscard; /* Discard the whole packet now? */
__u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */
__s8 fast_retransmit; /* Is this chunk fast retransmitted? */
__u8 tsn_missing_report; /* Data chunk missing counter. */
__u8 data_accepted; /* At least 1 chunk in this packet accepted */
__u8 auth; /* IN: was auth'ed | OUT: needs auth */
__u8 has_asconf; /* IN: have seen an asconf before */
#define SCTP_CAN_FRTX 0x0
#define SCTP_NEED_FRTX 0x1
#define SCTP_DONT_FRTX 0x2
__u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
resent:1, /* Has this chunk ever been resent. */
has_tsn:1, /* Does this chunk have a TSN yet? */
has_ssn:1, /* Does this chunk have a SSN yet? */
singleton:1, /* Only chunk in the packet? */
end_of_packet:1, /* Last chunk in the packet? */
ecn_ce_done:1, /* Have we processed the ECN CE bit? */
pdiscard:1, /* Discard the whole packet now? */
tsn_gap_acked:1, /* Is this chunk acked by a GAP ACK? */
data_accepted:1, /* At least 1 chunk accepted */
auth:1, /* IN: was auth'ed | OUT: needs auth */
has_asconf:1, /* IN: have seen an asconf before */
tsn_missing_report:2, /* Data chunk missing counter. */
fast_retransmit:2; /* Is this chunk fast retransmitted? */
};
void sctp_chunk_hold(struct sctp_chunk *);