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tcp: add in_flight to tcp_skb_cb 

Add in_flight (bytes in flight when packet was sent) field
to tx component of tcp_skb_cb and make it available to
congestion modules' pkts_acked() function through the
ack_sample function argument.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lawrence Brakmo 2016-06-08 21:16:44 -07:00 committed by David S. Miller
parent 3e7fb80b60
commit 6f094b9ec6
3 changed files with 9 additions and 2 deletions
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2
include/net/tcp.h
View File

@ -767,6 +767,7 @@ struct tcp_skb_cb {
union {
struct {
/* There is space for up to 20 bytes */
__u32 in_flight;/* Bytes in flight when packet sent */
} tx; /* only used for outgoing skbs */
union {
struct inet_skb_parm h4;
@ -859,6 +860,7 @@ union tcp_cc_info;
struct ack_sample {
u32 pkts_acked;
s32 rtt_us;
u32 in_flight;
};
struct tcp_congestion_ops {

5
net/ipv4/tcp_input.c
View File

@ -3115,6 +3115,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
long ca_rtt_us = -1L;
struct sk_buff *skb;
u32 pkts_acked = 0;
u32 last_in_flight = 0;
bool rtt_update;
int flag = 0;
@ -3154,6 +3155,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
if (!first_ackt.v64)
first_ackt = last_ackt;
last_in_flight = TCP_SKB_CB(skb)->tx.in_flight;
reord = min(pkts_acked, reord);
if (!after(scb->end_seq, tp->high_seq))
flag |= FLAG_ORIG_SACK_ACKED;
@ -3250,7 +3252,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
if (icsk->icsk_ca_ops->pkts_acked) {
struct ack_sample sample = { .pkts_acked = pkts_acked,
.rtt_us = ca_rtt_us };
.rtt_us = ca_rtt_us,
.in_flight = last_in_flight };
icsk->icsk_ca_ops->pkts_acked(sk, &sample);
}

4
net/ipv4/tcp_output.c
View File

@ -911,9 +911,12 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
int err;
BUG_ON(!skb || !tcp_skb_pcount(skb));
tp = tcp_sk(sk);
if (clone_it) {
skb_mstamp_get(&skb->skb_mstamp);
TCP_SKB_CB(skb)->tx.in_flight = TCP_SKB_CB(skb)->end_seq
- tp->snd_una;
if (unlikely(skb_cloned(skb)))
skb = pskb_copy(skb, gfp_mask);
@ -924,7 +927,6 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
}
inet = inet_sk(sk);
tp = tcp_sk(sk);
tcb = TCP_SKB_CB(skb);
memset(&opts, 0, sizeof(opts));