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[DCCP]: Introduce dccp_write_xmit from code in dccp_sendmsg 

This way it gets closer to the TCP flow, where congestion window
checks are done, it seems we can map ccid_hc_tx_send_packet in
dccp_write_xmit to tcp_snd_wnd_test in tcp_write_xmit, a CCID2
decision should just fit in here as well...

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 2005-08-09 20:30:56 -07:00 committed by David S. Miller
parent 0d48d93947
commit 27258ee54f
5 changed files with 57 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/dccp/ccid.h
View File

@ -43,8 +43,7 @@ struct ccid {
unsigned char len, u16 idx,
unsigned char* value);
int (*ccid_hc_tx_send_packet)(struct sock *sk,
struct sk_buff *skb, int len,
long *delay);
struct sk_buff *skb, int len);
void (*ccid_hc_tx_packet_sent)(struct sock *sk, int more, int len);
};
@ -60,12 +59,11 @@ static inline void __ccid_get(struct ccid *ccid)
}
static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
struct sk_buff *skb, int len,
long *delay)
struct sk_buff *skb, int len)
{
int rc = 0;
if (ccid->ccid_hc_tx_send_packet != NULL)
rc = ccid->ccid_hc_tx_send_packet(sk, skb, len, delay);
rc = ccid->ccid_hc_tx_send_packet(sk, skb, len);
return rc;
}

13
net/dccp/ccids/ccid3.c
View File

@ -977,13 +977,14 @@ out:
sock_put(sk);
}
static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb,
int len, long *delay)
static int ccid3_hc_tx_send_packet(struct sock *sk,
struct sk_buff *skb, int len)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
struct ccid3_tx_hist_entry *new_packet = NULL;
struct timeval now;
long delay;
int rc = -ENOTCONN;
// ccid3_pr_debug("%s, sk=%p, skb=%p, len=%d\n", dccp_role(sk), sk, skb, len);
@ -1037,11 +1038,11 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb,
break;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
*delay = (now_delta(hctx->ccid3hctx_t_nom) - hctx->ccid3hctx_delta);
ccid3_pr_debug("send_packet delay=%ld\n",*delay);
*delay /= -1000;
delay = (now_delta(hctx->ccid3hctx_t_nom) - hctx->ccid3hctx_delta);
ccid3_pr_debug("send_packet delay=%ld\n", delay);
delay /= -1000;
/* divide by -1000 is to convert to ms and get sign right */
rc = *delay > 0 ? -EAGAIN : 0;
rc = delay > 0 ? -EAGAIN : 0;
break;
default:
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",

5
net/dccp/dccp.h
View File

@ -122,6 +122,9 @@ extern void dccp_send_ack(struct sock *sk);
extern void dccp_send_delayed_ack(struct sock *sk);
extern void dccp_send_sync(struct sock *sk, u64 seq);
extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb,
const int len);
extern void dccp_init_xmit_timers(struct sock *sk);
static inline void dccp_clear_xmit_timers(struct sock *sk)
{
@ -194,8 +197,6 @@ static inline void dccp_openreq_init(struct request_sock *req,
req->rcv_wnd = 0;
}
extern void dccp_v4_send_check(struct sock *sk, struct dccp_hdr *dh, int len,
struct sk_buff *skb);
extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
extern struct sock *dccp_create_openreq_child(struct sock *sk,

38
net/dccp/output.c
View File

@ -148,6 +148,41 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
return mss_now;
}
int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, const int len)
{
const struct dccp_sock *dp = dccp_sk(sk);
int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, len);
if (err == 0) {
const struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
if (sk->sk_state == DCCP_PARTOPEN) {
/* See 8.1.5. Handshake Completion */
inet_csk_schedule_ack(sk);
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
inet_csk(sk)->icsk_rto,
DCCP_RTO_MAX);
dcb->dccpd_type = DCCP_PKT_DATAACK;
/*
* FIXME: we really should have a
* dccps_ack_pending or use icsk.
*/
} else if (inet_csk_ack_scheduled(sk) ||
(dp->dccps_options.dccpo_send_ack_vector &&
ap->dccpap_buf_ackno != DCCP_MAX_SEQNO + 1 &&
ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1))
dcb->dccpd_type = DCCP_PKT_DATAACK;
else
dcb->dccpd_type = DCCP_PKT_DATA;
err = dccp_transmit_skb(sk, skb);
ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
}
return err;
}
int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
{
if (inet_sk_rebuild_header(sk) != 0)
@ -299,7 +334,8 @@ int dccp_connect(struct sock *sk)
DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS);
/* Timer for repeating the REQUEST until an answer. */
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX);
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
icsk->icsk_rto, DCCP_RTO_MAX);
return 0;
}

65
net/dccp/proto.c
View File

@ -182,8 +182,7 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
return -EMSGSIZE;
lock_sock(sk);
timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
timeo = sock_sndtimeo(sk, noblock);
/*
* We have to use sk_stream_wait_connect here to set sk_write_pending,
@ -192,77 +191,27 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
/* Wait for a connection to finish. */
if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING))
if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
goto out_err;
goto out_release;
size = sk->sk_prot->max_header + len;
release_sock(sk);
skb = sock_alloc_send_skb(sk, size, noblock, &rc);
lock_sock(sk);
if (skb == NULL)
goto out_release;
skb_reserve(skb, sk->sk_prot->max_header);
rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
if (rc == 0) {
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
const struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
long delay;
if (rc != 0)
goto out_discard;
/*
* XXX: This is just to match the Waikato tree CA interaction
* points, after the CCID3 code is stable and I have a better
* understanding of behaviour I'll change this to look more like
* TCP.
*/
while (1) {
rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk,
skb, len, &delay);
if (rc == 0)
break;
if (rc != -EAGAIN)
goto out_discard;
if (delay > timeo)
goto out_discard;
release_sock(sk);
delay = schedule_timeout(delay);
lock_sock(sk);
timeo -= delay;
if (signal_pending(current))
goto out_interrupted;
rc = -EPIPE;
if (!(sk->sk_state == DCCP_PARTOPEN || sk->sk_state == DCCP_OPEN))
goto out_discard;
}
if (sk->sk_state == DCCP_PARTOPEN) {
/* See 8.1.5. Handshake Completion */
inet_csk_schedule_ack(sk);
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
dcb->dccpd_type = DCCP_PKT_DATAACK;
/* FIXME: we really should have a dccps_ack_pending or use icsk */
} else if (inet_csk_ack_scheduled(sk) ||
(dp->dccps_options.dccpo_send_ack_vector &&
ap->dccpap_buf_ackno != DCCP_MAX_SEQNO + 1 &&
ap->dccpap_ack_seqno == DCCP_MAX_SEQNO + 1))
dcb->dccpd_type = DCCP_PKT_DATAACK;
else
dcb->dccpd_type = DCCP_PKT_DATA;
dccp_transmit_skb(sk, skb);
ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
} else {
out_discard:
kfree_skb(skb);
}
rc = dccp_write_xmit(sk, skb, len);
out_release:
release_sock(sk);
return rc ? : len;
out_err:
rc = sk_stream_error(sk, flags, rc);
out_discard:
kfree_skb(skb);
goto out_release;
out_interrupted:
rc = sock_intr_errno(timeo);
goto out_discard;
}
EXPORT_SYMBOL(dccp_sendmsg);