[DCCP]: Introduce macro for incrementing modulo-48
Problem: DCCP sequence numbers are mostly stored in 48-bit bitfields
which are acommodated within an u64 number. For these fields,
dccp_inc_seqno() can not be used since it takes a u64 pointer.
Fix: Solved by introducing an INC48() macro to increment modulo-2^48.
Note: This macro can be used in several places within the ccid3 code.
However, these changes affect others in turn and therefore require
a separate patch.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/dccp.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -102,6 +102,7 @@ extern int sysctl_dccp_tx_qlen;
#define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
#define ADD48(a, b) (((a) + (b)) & DCCP_MAX_SEQNO)
#define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
+#define INC48(seqno) seqno = ADD48(seqno, 1)
static inline void dccp_set_seqno(u64 *seqno, u64 value)
{
@@ -110,7 +111,7 @@ static inline void dccp_set_seqno(u64 *s
static inline void dccp_inc_seqno(u64 *seqno)
{
- *seqno = ADD48(*seqno, 1);
+ INC48(*seqno);
}
/* return > 0 if seqno1 is `before' seqno2, <= 0 otherwise */
-
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