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[DCCP]: Sample RTT from SYN exchange 

Function:
wifi-calibration
Gerrit Renker 2007-03-20 15:27:17 -03:00 committed by David S. Miller
parent 7dfee1a9c0
commit 89560b53b9
3 changed files with 18 additions and 0 deletions
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2
include/linux/dccp.h
View File

@ -481,10 +481,12 @@ struct dccp_ackvec;
* @dccps_hc_rx_insert_options -
* @dccps_hc_tx_insert_options -
* @dccps_xmit_timer - timer for when CCID is not ready to send
* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
*/
struct dccp_sock {
/* inet_connection_sock has to be the first member of dccp_sock */
struct inet_connection_sock dccps_inet_connection;
#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
__u64 dccps_swl;
__u64 dccps_swh;
__u64 dccps_awl;

8
net/dccp/input.c
View File

@ -300,6 +300,14 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
if (dccp_parse_options(sk, skb))
goto out_invalid_packet;
/* Obtain RTT sample from SYN exchange (used by CCID 3) */
if (dp->dccps_options_received.dccpor_timestamp_echo) {
struct timeval now;
dccp_timestamp(sk, &now);
dp->dccps_syn_rtt = dccp_sample_rtt(sk, &now, NULL);
}
if (dccp_msk(sk)->dccpms_send_ack_vector &&
dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
DCCP_SKB_CB(skb)->dccpd_seq,

8
net/dccp/options.c
View File

@ -563,6 +563,14 @@ int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
dccp_insert_options_feat(sk, skb))
return -1;
/*
* Obtain RTT sample from Request/Response exchange.
* This is currently used in CCID 3 initialisation.
*/
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
dccp_insert_option_timestamp(sk, skb))
return -1;
/* XXX: insert other options when appropriate */
if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {