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Message-Id: <1430411012-4939-1-git-send-email-kennetkl@ifi.uio.no>
Date: Thu, 30 Apr 2015 18:23:30 +0200
From: Kenneth Klette Jonassen <kennetkl@....uio.no>
To: netdev@...r.kernel.org
Cc: Kenneth Klette Jonassen <kennetkl@....uio.no>,
Yuchung Cheng <ycheng@...gle.com>,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 1/3] tcp: move struct tcp_sacktag_state to tcp_ack()
Later patch passes two values set in tcp_sacktag_one() to
tcp_clean_rtx_queue(). Prepare passing them via struct tcp_sacktag_state.
Cc: Yuchung Cheng <ycheng@...gle.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Kenneth Klette Jonassen <kennetkl@....uio.no>
---
net/ipv4/tcp_input.c | 45 ++++++++++++++++++++++-----------------------
1 file changed, 22 insertions(+), 23 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index bc790ea..9902cf1 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1634,7 +1634,7 @@ static int tcp_sack_cache_ok(const struct tcp_sock *tp, const struct tcp_sack_bl
static int
tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
- u32 prior_snd_una, long *sack_rtt_us)
+ u32 prior_snd_una, struct tcp_sacktag_state *state)
{
struct tcp_sock *tp = tcp_sk(sk);
const unsigned char *ptr = (skb_transport_header(ack_skb) +
@@ -1642,7 +1642,6 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
struct tcp_sack_block_wire *sp_wire = (struct tcp_sack_block_wire *)(ptr+2);
struct tcp_sack_block sp[TCP_NUM_SACKS];
struct tcp_sack_block *cache;
- struct tcp_sacktag_state state;
struct sk_buff *skb;
int num_sacks = min(TCP_NUM_SACKS, (ptr[1] - TCPOLEN_SACK_BASE) >> 3);
int used_sacks;
@@ -1650,9 +1649,8 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
int i, j;
int first_sack_index;
- state.flag = 0;
- state.reord = tp->packets_out;
- state.rtt_us = -1L;
+ state->flag = 0;
+ state->reord = tp->packets_out;
if (!tp->sacked_out) {
if (WARN_ON(tp->fackets_out))
@@ -1663,7 +1661,7 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
found_dup_sack = tcp_check_dsack(sk, ack_skb, sp_wire,
num_sacks, prior_snd_una);
if (found_dup_sack)
- state.flag |= FLAG_DSACKING_ACK;
+ state->flag |= FLAG_DSACKING_ACK;
/* Eliminate too old ACKs, but take into
* account more or less fresh ones, they can
@@ -1728,7 +1726,7 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
}
skb = tcp_write_queue_head(sk);
- state.fack_count = 0;
+ state->fack_count = 0;
i = 0;
if (!tp->sacked_out) {
@@ -1762,10 +1760,10 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
/* Head todo? */
if (before(start_seq, cache->start_seq)) {
- skb = tcp_sacktag_skip(skb, sk, &state,
+ skb = tcp_sacktag_skip(skb, sk, state,
start_seq);
skb = tcp_sacktag_walk(skb, sk, next_dup,
- &state,
+ state,
start_seq,
cache->start_seq,
dup_sack);
@@ -1776,7 +1774,7 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
goto advance_sp;
skb = tcp_maybe_skipping_dsack(skb, sk, next_dup,
- &state,
+ state,
cache->end_seq);
/* ...tail remains todo... */
@@ -1785,12 +1783,12 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
skb = tcp_highest_sack(sk);
if (!skb)
break;
- state.fack_count = tp->fackets_out;
+ state->fack_count = tp->fackets_out;
cache++;
goto walk;
}
- skb = tcp_sacktag_skip(skb, sk, &state, cache->end_seq);
+ skb = tcp_sacktag_skip(skb, sk, state, cache->end_seq);
/* Check overlap against next cached too (past this one already) */
cache++;
continue;
@@ -1800,12 +1798,12 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
skb = tcp_highest_sack(sk);
if (!skb)
break;
- state.fack_count = tp->fackets_out;
+ state->fack_count = tp->fackets_out;
}
- skb = tcp_sacktag_skip(skb, sk, &state, start_seq);
+ skb = tcp_sacktag_skip(skb, sk, state, start_seq);
walk:
- skb = tcp_sacktag_walk(skb, sk, next_dup, &state,
+ skb = tcp_sacktag_walk(skb, sk, next_dup, state,
start_seq, end_seq, dup_sack);
advance_sp:
@@ -1820,9 +1818,9 @@ advance_sp:
for (j = 0; j < used_sacks; j++)
tp->recv_sack_cache[i++] = sp[j];
- if ((state.reord < tp->fackets_out) &&
+ if ((state->reord < tp->fackets_out) &&
((inet_csk(sk)->icsk_ca_state != TCP_CA_Loss) || tp->undo_marker))
- tcp_update_reordering(sk, tp->fackets_out - state.reord, 0);
+ tcp_update_reordering(sk, tp->fackets_out - state->reord, 0);
tcp_mark_lost_retrans(sk);
tcp_verify_left_out(tp);
@@ -1834,8 +1832,7 @@ out:
WARN_ON((int)tp->retrans_out < 0);
WARN_ON((int)tcp_packets_in_flight(tp) < 0);
#endif
- *sack_rtt_us = state.rtt_us;
- return state.flag;
+ return state->flag;
}
/* Limits sacked_out so that sum with lost_out isn't ever larger than
@@ -3459,6 +3456,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp_sacktag_state sack_state;
u32 prior_snd_una = tp->snd_una;
u32 ack_seq = TCP_SKB_CB(skb)->seq;
u32 ack = TCP_SKB_CB(skb)->ack_seq;
@@ -3467,7 +3465,8 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
int prior_packets = tp->packets_out;
const int prior_unsacked = tp->packets_out - tp->sacked_out;
int acked = 0; /* Number of packets newly acked */
- long sack_rtt_us = -1L;
+
+ sack_state.rtt_us = -1L;
/* We very likely will need to access write queue head. */
prefetchw(sk->sk_write_queue.next);
@@ -3531,7 +3530,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
if (TCP_SKB_CB(skb)->sacked)
flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una,
- &sack_rtt_us);
+ &sack_state);
if (tcp_ecn_rcv_ecn_echo(tp, tcp_hdr(skb))) {
flag |= FLAG_ECE;
@@ -3556,7 +3555,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
/* See if we can take anything off of the retransmit queue. */
acked = tp->packets_out;
flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una,
- sack_rtt_us);
+ sack_state.rtt_us);
acked -= tp->packets_out;
/* Advance cwnd if state allows */
@@ -3608,7 +3607,7 @@ old_ack:
*/
if (TCP_SKB_CB(skb)->sacked) {
flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una,
- &sack_rtt_us);
+ &sack_state);
tcp_fastretrans_alert(sk, acked, prior_unsacked,
is_dupack, flag);
}
--
2.1.0
--
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