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[DCCP]: 48-bit sequence number arithmetic

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This patch
 * organizes the sequence arithmetic functions into one corner of dccp.h
 * performs a small modification of dccp_set_seqno to make it more widely reusable
   (now it is safe to use any number, since it performs modulo-2^48 assignment)
 * adds functions and generic macros for 48-bit sequence arithmetic:
 	--48 bit complement
 	--modulo-48 addition and modulo-48 subtraction
	--dccp_inc_seqno now a special case of add48
Constants renamed following a suggestion by Arnaldo.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker
2007-03-20 12:26:51 -03:00
committed by David S. Miller
parent 8b5be26831
commit 6b811d43f6
2 changed files with 28 additions and 21 deletions
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2
net/dccp/ackvec.c
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@@ -157,7 +157,7 @@ struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
if (av != NULL) {
av->dccpav_buf_head = DCCP_MAX_ACKVEC_LEN - 1;
av->dccpav_buf_ackno = DCCP_MAX_SEQNO + 1;
av->dccpav_buf_ackno = UINT48_MAX + 1;
av->dccpav_buf_nonce = av->dccpav_buf_nonce = 0;
av->dccpav_time.tv_sec = 0;
av->dccpav_time.tv_usec = 0;