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dccp ccid-2: Stop polling

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This updates CCID-2 to use the CCID dequeuing mechanism, converting from
previous continuous-polling to a now event-driven mechanism.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2010-10-27 19:16:28 +00:00 committed by David S. Miller
parent b1fcf55eea
commit 1c0e0a0569
2 changed files with 20 additions and 8 deletions
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23
net/dccp/ccids/ccid2.c
View file

@ -78,12 +78,9 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hc)
static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
{
struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
if (hc->tx_pipe < hc->tx_cwnd)
return 0;
return 1; /* XXX CCID should dequeue when ready instead of polling */
if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk)))
return CCID_PACKET_WILL_DEQUEUE_LATER;
return CCID_PACKET_SEND_AT_ONCE;
}
static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
@ -115,6 +112,7 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
{
struct sock *sk = (struct sock *)data;
struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
@ -129,8 +127,6 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
if (hc->tx_rto > DCCP_RTO_MAX)
hc->tx_rto = DCCP_RTO_MAX;
sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
/* adjust pipe, cwnd etc */
hc->tx_ssthresh = hc->tx_cwnd / 2;
if (hc->tx_ssthresh < 2)
@ -146,6 +142,12 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
hc->tx_rpseq = 0;
hc->tx_rpdupack = -1;
ccid2_change_l_ack_ratio(sk, 1);
/* if we were blocked before, we may now send cwnd=1 packet */
if (sender_was_blocked)
tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);
/* restart backed-off timer */
sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
out:
bh_unlock_sock(sk);
sock_put(sk);
@ -434,6 +436,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
u64 ackno, seqno;
struct ccid2_seq *seqp;
unsigned char *vector;
@ -631,6 +634,10 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
sk_stop_timer(sk, &hc->tx_rtotimer);
else
sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto);
/* check if incoming Acks allow pending packets to be sent */
if (sender_was_blocked && !ccid2_cwnd_network_limited(hc))
tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);
}
static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)

5
net/dccp/ccids/ccid2.h
View file

@ -81,6 +81,11 @@ struct ccid2_hc_tx_sock {
u64 tx_high_ack;
};
static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
{
return hc->tx_pipe >= hc->tx_cwnd;
}
struct ccid2_hc_rx_sock {
int rx_data;
};