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[CCID3]: Call sk->sk_write_space(sk) when receiving a feedback packet 

This makes the send rate calculations behave way more closely to what
is specified, with the jitter previously seen on x and x_recv
disappearing completely on non lossy setups.

This resembles the tcp_data_snd_check code, that possibly we'll end up
using in DCCP as well, perhaps moving this code to
inet_connection_sock.

For now I'm doing the simplest implementation tho.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2005-08-29 02:15:54 -03:00 committed by David S. Miller
parent a84ffe4303
commit c530cfb1ce
4 changed files with 20 additions and 0 deletions
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5
net/dccp/ccids/ccid3.c
View File

@ -556,6 +556,11 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
/* remove all packets older than the one acked from history */
dccp_tx_hist_purge_older(ccid3_tx_hist,
&hctx->ccid3hctx_hist, packet);
/*
* As we have calculated new ipi, delta, t_nom it is possible that
* we now can send a packet, so wake up dccp_wait_for_ccids.
*/
sk->sk_write_space(sk);
/*
* Schedule no feedback timer to expire in

1
net/dccp/dccp.h
View File

@ -127,6 +127,7 @@ extern void dccp_send_sync(struct sock *sk, const u64 seq,
const enum dccp_pkt_type pkt_type);
extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
extern void dccp_write_space(struct sock *sk);
extern void dccp_init_xmit_timers(struct sock *sk);
static inline void dccp_clear_xmit_timers(struct sock *sk)

1
net/dccp/ipv4.c
View File

@ -1280,6 +1280,7 @@ static int dccp_v4_init_sock(struct sock *sk)
dccp_init_xmit_timers(sk);
inet_csk(sk)->icsk_rto = DCCP_TIMEOUT_INIT;
sk->sk_state = DCCP_CLOSED;
sk->sk_write_space = dccp_write_space;
dp->dccps_mss_cache = 536;
dp->dccps_role = DCCP_ROLE_UNDEFINED;

13
net/dccp/output.c
View File

@ -150,6 +150,19 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
return mss_now;
}
void dccp_write_space(struct sock *sk)
{
read_lock(&sk->sk_callback_lock);
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible(sk->sk_sleep);
/* Should agree with poll, otherwise some programs break */
if (sock_writeable(sk))
sk_wake_async(sk, 2, POLL_OUT);
read_unlock(&sk->sk_callback_lock);
}
/**
* dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
* @sk: socket to wait for