sctp: Save some room in the sctp_transport by using bitfields

Saves some room in the sctp_transport structure.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 03deffb..9072dd6 100644 (file)
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -877,7 +877,33 @@ struct sctp_transport {
 
        /* Reference counting. */
        atomic_t refcnt;
-       int      dead;
+       int      dead:1,
+               /* RTO-Pending : A flag used to track if one of the DATA
+                *              chunks sent to this address is currently being
+                *              used to compute a RTT. If this flag is 0,
+                *              the next DATA chunk sent to this destination
+                *              should be used to compute a RTT and this flag
+                *              should be set. Every time the RTT
+                *              calculation completes (i.e. the DATA chunk
+                *              is SACK'd) clear this flag.
+                */
+                rto_pending:1,
+
+               /*
+                * hb_sent : a flag that signals that we have a pending
+                * heartbeat.
+                */
+               hb_sent:1,
+
+               /* Flag to track the current fast recovery state */
+               fast_recovery:1,
+
+               /* Is the Path MTU update pending on this tranport */
+               pmtu_pending:1,
+
+               /* Is this structure kfree()able? */
+               malloced:1;
+
 
        /* This is the peer's IP address and port. */
        union sctp_addr ipaddr;
@@ -907,22 +933,6 @@ struct sctp_transport {
        /* SRTT        : The current smoothed round trip time.  */
        __u32 srtt;
 
-       /* RTO-Pending : A flag used to track if one of the DATA
-        *              chunks sent to this address is currently being
-        *              used to compute a RTT. If this flag is 0,
-        *              the next DATA chunk sent to this destination
-        *              should be used to compute a RTT and this flag
-        *              should be set. Every time the RTT
-        *              calculation completes (i.e. the DATA chunk
-        *              is SACK'd) clear this flag.
-        * hb_sent : a flag that signals that we have a pending heartbeat.
-        */
-       __u8 rto_pending;
-       __u8 hb_sent;
-
-       /* Flag to track the current fast recovery state */
-       __u8 fast_recovery;
-
        /*
         * These are the congestion stats.
         */
@@ -975,9 +985,6 @@ struct sctp_transport {
         */
        __u16 pathmaxrxt;
 
-       /* is the Path MTU update pending on this tranport */
-       __u8 pmtu_pending;
-
        /* PMTU       : The current known path MTU.  */
        __u32 pathmtu;
 
@@ -1021,8 +1028,6 @@ struct sctp_transport {
        /* This is the list of transports that have chunks to send.  */
        struct list_head send_ready;
 
-       int malloced; /* Is this structure kfree()able? */
-
        /* State information saved for SFR_CACC algorithm. The key
         * idea in SFR_CACC is to maintain state at the sender on a
         * per-destination basis when a changeover happens.