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[DCCP] ackvec: Introduce ack vector records

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Based on a patch by Andrea Bittau.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrea Bittau
2006-03-20 17:19:55 -08:00
committed by David S. Miller
parent e229c2fb33
commit 02bcf28c82
2 changed files with 173 additions and 98 deletions
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31
net/dccp/ackvec.h
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@@ -13,6 +13,7 @@
#include <linux/config.h>
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/time.h>
#include <linux/types.h>
@@ -42,11 +43,8 @@
* Ack Vectors it has recently sent. For each packet sent carrying an
* Ack Vector, it remembers four variables:
*
* @dccpav_ack_seqno - the Sequence Number used for the packet
* (HC-Receiver seqno)
* @dccpav_ack_ptr - the value of buf_head at the time of acknowledgement.
* @dccpav_ack_ackno - the Acknowledgement Number used for the packet
* (HC-Sender seqno)
* @dccpav_records - list of dccp_ackvec_record
* @dccpav_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
*
* @dccpav_time - the time in usecs
@@ -54,8 +52,7 @@
*/
struct dccp_ackvec {
u64 dccpav_buf_ackno;
u64 dccpav_ack_seqno;
u64 dccpav_ack_ackno;
struct list_head dccpav_records;
struct timeval dccpav_time;
u8 dccpav_buf_head;
u8 dccpav_buf_tail;
@@ -67,6 +64,28 @@ struct dccp_ackvec {
u8 dccpav_buf[DCCP_MAX_ACKVEC_LEN];
};
/** struct dccp_ackvec_record - ack vector record
*
* ACK vector record as defined in Appendix A of spec.
*
* The list is sorted by dccpavr_ack_seqno
*
* @dccpavr_node - node in dccpav_records
* @dccpavr_ack_seqno - sequence number of the packet this record was sent on
* @dccpavr_ack_ackno - sequence number being acknowledged
* @dccpavr_ack_ptr - pointer into dccpav_buf where this record starts
* @dccpavr_ack_nonce - dccpav_ack_nonce at the time this record was sent
* @dccpavr_sent_len - lenght of the record in dccpav_buf
*/
struct dccp_ackvec_record {
struct list_head dccpavr_node;
u64 dccpavr_ack_seqno;
u64 dccpavr_ack_ackno;
u8 dccpavr_ack_ptr;
u8 dccpavr_ack_nonce;
u8 dccpavr_sent_len;
};
struct sock;
struct sk_buff;