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[TCP]: Cleanup tcp_tso_acked and tcp_clean_rtx_queue 

Implements following cleanups:
- Comment re-placement (CodingStyle)
- tcp_tso_acked() local (wrapper-like) variable removal
  (readability)
- __-types removed (IMHO they make local variables jumpy looking
  and just was space)
- acked -> flag (naming conventions elsewhere in TCP code)
- linebreak adjustments (readability)
- nested if()s combined (reduced indentation)
- clarifying newlines added

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-09-20 11:33:43 -07:00 committed by David S. Miller
parent 13fcf850cc
commit 7c46a03e67
1 changed files with 30 additions and 36 deletions
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66
net/ipv4/tcp_input.c
View File

@ -2525,55 +2525,49 @@ static void tcp_rearm_rto(struct sock *sk)
}
}
/* If we get here, the whole TSO packet has not been acked. */
static u32 tcp_tso_acked(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
__u32 seq = tp->snd_una;
__u32 packets_acked;
u32 packets_acked;
/* If we get here, the whole TSO packet has not been
* acked.
*/
BUG_ON(!after(scb->end_seq, seq));
BUG_ON(!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una));
packets_acked = tcp_skb_pcount(skb);
if (tcp_trim_head(sk, skb, seq - scb->seq))
if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq))
return 0;
packets_acked -= tcp_skb_pcount(skb);
if (packets_acked) {
BUG_ON(tcp_skb_pcount(skb) == 0);
BUG_ON(!before(scb->seq, scb->end_seq));
BUG_ON(!before(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq));
}
return packets_acked;
}
/* Remove acknowledged frames from the retransmission queue. */
static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
/* Remove acknowledged frames from the retransmission queue. If our packet
* is before the ack sequence we can discard it as it's confirmed to have
* arrived at the other end.
*/
static int tcp_clean_rtx_queue(struct sock *sk, s32 *seq_rtt_p)
{
struct tcp_sock *tp = tcp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
struct sk_buff *skb;
__u32 now = tcp_time_stamp;
u32 now = tcp_time_stamp;
int fully_acked = 1;
int acked = 0;
int flag = 0;
int prior_packets = tp->packets_out;
__s32 seq_rtt = -1;
s32 seq_rtt = -1;
ktime_t last_ackt = net_invalid_timestamp();
while ((skb = tcp_write_queue_head(sk)) &&
skb != tcp_send_head(sk)) {
while ((skb = tcp_write_queue_head(sk)) && skb != tcp_send_head(sk)) {
struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
u32 end_seq;
u32 packets_acked;
__u8 sacked = scb->sacked;
u8 sacked = scb->sacked;
/* If our packet is before the ack sequence we can
* discard it as it's confirmed to have arrived at
* the other end.
*/
if (after(scb->end_seq, tp->snd_una)) {
if (tcp_skb_pcount(skb) == 1 ||
!after(tp->snd_una, scb->seq))
@ -2598,38 +2592,38 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
* quickly. This is severely frowned upon behavior.
*/
if (!(scb->flags & TCPCB_FLAG_SYN)) {
acked |= FLAG_DATA_ACKED;
flag |= FLAG_DATA_ACKED;
} else {
acked |= FLAG_SYN_ACKED;
flag |= FLAG_SYN_ACKED;
tp->retrans_stamp = 0;
}
/* MTU probing checks */
if (fully_acked && icsk->icsk_mtup.probe_size) {
if (!after(tp->mtu_probe.probe_seq_end, TCP_SKB_CB(skb)->end_seq)) {
tcp_mtup_probe_success(sk, skb);
}
if (fully_acked && icsk->icsk_mtup.probe_size &&
!after(tp->mtu_probe.probe_seq_end, scb->end_seq)) {
tcp_mtup_probe_success(sk, skb);
}
if (sacked) {
if (sacked & TCPCB_RETRANS) {
if (sacked & TCPCB_SACKED_RETRANS)
tp->retrans_out -= packets_acked;
acked |= FLAG_RETRANS_DATA_ACKED;
flag |= FLAG_RETRANS_DATA_ACKED;
seq_rtt = -1;
} else if (seq_rtt < 0) {
seq_rtt = now - scb->when;
if (fully_acked)
last_ackt = skb->tstamp;
}
if (sacked & TCPCB_SACKED_ACKED)
tp->sacked_out -= packets_acked;
if (sacked & TCPCB_LOST)
tp->lost_out -= packets_acked;
if (sacked & TCPCB_URG) {
if (tp->urg_mode && !before(end_seq, tp->snd_up))
tp->urg_mode = 0;
}
if ((sacked & TCPCB_URG) && tp->urg_mode &&
!before(end_seq, tp->snd_up))
tp->urg_mode = 0;
} else if (seq_rtt < 0) {
seq_rtt = now - scb->when;
if (fully_acked)
@ -2645,12 +2639,12 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
tcp_clear_all_retrans_hints(tp);
}
if (acked&FLAG_ACKED) {
if (flag & FLAG_ACKED) {
u32 pkts_acked = prior_packets - tp->packets_out;
const struct tcp_congestion_ops *ca_ops
= inet_csk(sk)->icsk_ca_ops;
tcp_ack_update_rtt(sk, acked, seq_rtt);
tcp_ack_update_rtt(sk, flag, seq_rtt);
tcp_rearm_rto(sk);
tp->fackets_out -= min(pkts_acked, tp->fackets_out);
@ -2664,7 +2658,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
s32 rtt_us = -1;
/* Is the ACK triggering packet unambiguous? */
if (!(acked & FLAG_RETRANS_DATA_ACKED)) {
if (!(flag & FLAG_RETRANS_DATA_ACKED)) {
/* High resolution needed and available? */
if (ca_ops->flags & TCP_CONG_RTT_STAMP &&
!ktime_equal(last_ackt,
@ -2703,7 +2697,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
}
#endif
*seq_rtt_p = seq_rtt;
return acked;
return flag;
}
static void tcp_ack_probe(struct sock *sk)