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[ICSK]: Move TCP congestion avoidance members to icsk

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This changeset basically moves tcp_sk()->{ca_ops,ca_state,etc} to inet_csk(),
minimal renaming/moving done in this changeset to ease review.

Most of it is just changes of struct tcp_sock * to struct sock * parameters.

With this we move to a state closer to two interesting goals:

1. Generalisation of net/ipv4/tcp_diag.c, becoming inet_diag.c, being used
   for any INET transport protocol that has struct inet_hashinfo and are
   derived from struct inet_connection_sock. Keeps the userspace API, that will
   just not display DCCP sockets, while newer versions of tools can support
   DCCP.

2. INET generic transport pluggable Congestion Avoidance infrastructure, using
   the current TCP CA infrastructure with DCCP.

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 2005-08-10 04:03:31 -03:00 • committed by David S. Miller
parent 64ce207306
commit 6687e988d9
20 changed files with 412 additions and 334 deletions
Download patch file Download diff file Expand all files Collapse all files

36
net/ipv4/tcp_output.c
View file

@ -112,9 +112,9 @@ static void tcp_cwnd_restart(struct sock *sk, struct dst_entry *dst)
u32 restart_cwnd = tcp_init_cwnd(tp, dst);
u32 cwnd = tp->snd_cwnd;
tcp_ca_event(tp, CA_EVENT_CWND_RESTART);
tcp_ca_event(sk, CA_EVENT_CWND_RESTART);
tp->snd_ssthresh = tcp_current_ssthresh(tp);
tp->snd_ssthresh = tcp_current_ssthresh(sk);
restart_cwnd = min(restart_cwnd, cwnd);
while ((delta -= inet_csk(sk)->icsk_rto) > 0 && cwnd > restart_cwnd)
@ -265,6 +265,7 @@ static __inline__ u16 tcp_select_window(struct sock *sk)
static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb)
{
if (skb != NULL) {
const struct inet_connection_sock *icsk = inet_csk(sk);
struct inet_sock *inet = inet_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
@ -280,7 +281,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb)
#define SYSCTL_FLAG_SACK 0x4
/* If congestion control is doing timestamping */
if (tp->ca_ops->rtt_sample)
if (icsk->icsk_ca_ops->rtt_sample)
do_gettimeofday(&skb->stamp);
sysctl_flags = 0;
@ -308,7 +309,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb)
}
if (tcp_packets_in_flight(tp) == 0)
tcp_ca_event(tp, CA_EVENT_TX_START);
tcp_ca_event(sk, CA_EVENT_TX_START);
th = (struct tcphdr *) skb_push(skb, tcp_header_size);
skb->h.th = th;
@ -366,7 +367,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb)
if (err <= 0)
return err;
tcp_enter_cwr(tp);
tcp_enter_cwr(sk);
/* NET_XMIT_CN is special. It does not guarantee,
* that this packet is lost. It tells that device
@ -905,12 +906,13 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
*/
static int tcp_tso_should_defer(struct sock *sk, struct tcp_sock *tp, struct sk_buff *skb)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
u32 send_win, cong_win, limit, in_flight;
if (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)
return 0;
if (tp->ca_state != TCP_CA_Open)
if (icsk->icsk_ca_state != TCP_CA_Open)
return 0;
in_flight = tcp_packets_in_flight(tp);
@ -1287,6 +1289,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
*/
void tcp_simple_retransmit(struct sock *sk)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
unsigned int mss = tcp_current_mss(sk, 0);
@ -1317,12 +1320,12 @@ void tcp_simple_retransmit(struct sock *sk)
* in network, but units changed and effective
* cwnd/ssthresh really reduced now.
*/
if (tp->ca_state != TCP_CA_Loss) {
if (icsk->icsk_ca_state != TCP_CA_Loss) {
tp->high_seq = tp->snd_nxt;
tp->snd_ssthresh = tcp_current_ssthresh(tp);
tp->snd_ssthresh = tcp_current_ssthresh(sk);
tp->prior_ssthresh = 0;
tp->undo_marker = 0;
tcp_set_ca_state(tp, TCP_CA_Loss);
tcp_set_ca_state(sk, TCP_CA_Loss);
}
tcp_xmit_retransmit_queue(sk);
}
@ -1462,6 +1465,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
*/
void tcp_xmit_retransmit_queue(struct sock *sk)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
int packet_cnt = tp->lost_out;
@ -1485,7 +1489,7 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
if (!(sacked&(TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS))) {
if (tcp_retransmit_skb(sk, skb))
return;
if (tp->ca_state != TCP_CA_Loss)
if (icsk->icsk_ca_state != TCP_CA_Loss)
NET_INC_STATS_BH(LINUX_MIB_TCPFASTRETRANS);
else
NET_INC_STATS_BH(LINUX_MIB_TCPSLOWSTARTRETRANS);
@ -1507,7 +1511,7 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
/* OK, demanded retransmission is finished. */
/* Forward retransmissions are possible only during Recovery. */
if (tp->ca_state != TCP_CA_Recovery)
if (icsk->icsk_ca_state != TCP_CA_Recovery)
return;
/* No forward retransmissions in Reno are possible. */
@ -2028,7 +2032,7 @@ void tcp_send_probe0(struct sock *sk)
if (tp->packets_out || !sk->sk_send_head) {
/* Cancel probe timer, if it is not required. */
tp->probes_out = 0;
icsk->icsk_probes_out = 0;
icsk->icsk_backoff = 0;
return;
}
@ -2036,19 +2040,19 @@ void tcp_send_probe0(struct sock *sk)
if (err <= 0) {
if (icsk->icsk_backoff < sysctl_tcp_retries2)
icsk->icsk_backoff++;
tp->probes_out++;
icsk->icsk_probes_out++;
inet_csk_reset_xmit_timer(sk, ICSK_TIME_PROBE0,
min(icsk->icsk_rto << icsk->icsk_backoff, TCP_RTO_MAX),
TCP_RTO_MAX);
} else {
/* If packet was not sent due to local congestion,
* do not backoff and do not remember probes_out.
* do not backoff and do not remember icsk_probes_out.
* Let local senders to fight for local resources.
*
* Use accumulated backoff yet.
*/
if (!tp->probes_out)
tp->probes_out=1;
if (!icsk->icsk_probes_out)
icsk->icsk_probes_out = 1;
inet_csk_reset_xmit_timer(sk, ICSK_TIME_PROBE0,
min(icsk->icsk_rto << icsk->icsk_backoff,
TCP_RESOURCE_PROBE_INTERVAL),