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Message-Id: <1584524612-24470-14-git-send-email-ilpo.jarvinen@helsinki.fi>
Date: Wed, 18 Mar 2020 11:43:17 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
To: netdev@...r.kernel.org
Cc: Yuchung Cheng <ycheng@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>,
Olivier Tilmans <olivier.tilmans@...ia-bell-labs.com>
Subject: [RFC PATCH 13/28] tcp: Pass flags to tcp_send_ack
From: Ilpo Järvinen <ilpo.jarvinen@...helsinki.fi>
Accurate ECN reflector needs to send custom flags to handle
IP-ECN field reflector.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...helsinki.fi>
---
include/net/tcp.h | 4 ++--
net/ipv4/bpf_tcp_ca.c | 2 +-
net/ipv4/tcp.c | 2 +-
net/ipv4/tcp_dctcp.h | 2 +-
net/ipv4/tcp_input.c | 14 +++++++-------
net/ipv4/tcp_output.c | 10 +++++-----
net/ipv4/tcp_timer.c | 4 ++--
7 files changed, 19 insertions(+), 19 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ee938066fd8c..ddeb11c01faa 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -640,8 +640,8 @@ void tcp_send_fin(struct sock *sk);
void tcp_send_active_reset(struct sock *sk, gfp_t priority);
int tcp_send_synack(struct sock *);
void tcp_push_one(struct sock *, unsigned int mss_now);
-void __tcp_send_ack(struct sock *sk, u32 rcv_nxt);
-void tcp_send_ack(struct sock *sk);
+void __tcp_send_ack(struct sock *sk, u32 rcv_nxt, u16 flags);
+void tcp_send_ack(struct sock *sk, u16 flags);
void tcp_send_delayed_ack(struct sock *sk);
void tcp_send_loss_probe(struct sock *sk);
bool tcp_schedule_loss_probe(struct sock *sk, bool advancing_rto);
diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
index 574972bc7299..55b78183fbd9 100644
--- a/net/ipv4/bpf_tcp_ca.c
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -146,7 +146,7 @@ static int bpf_tcp_ca_btf_struct_access(struct bpf_verifier_log *log,
BPF_CALL_2(bpf_tcp_send_ack, struct tcp_sock *, tp, u32, rcv_nxt)
{
/* bpf_tcp_ca prog cannot have NULL tp */
- __tcp_send_ack((struct sock *)tp, rcv_nxt);
+ __tcp_send_ack((struct sock *)tp, rcv_nxt, 0);
return 0;
}
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2ee1e4794c7d..edc03a1bf704 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1572,7 +1572,7 @@ static void tcp_cleanup_rbuf(struct sock *sk, int copied)
}
}
if (time_to_ack)
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
}
static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
diff --git a/net/ipv4/tcp_dctcp.h b/net/ipv4/tcp_dctcp.h
index d69a77cbd0c7..4b0259111d81 100644
--- a/net/ipv4/tcp_dctcp.h
+++ b/net/ipv4/tcp_dctcp.h
@@ -28,7 +28,7 @@ static inline void dctcp_ece_ack_update(struct sock *sk, enum tcp_ca_event evt,
*/
if (inet_csk(sk)->icsk_ack.pending & ICSK_ACK_TIMER) {
dctcp_ece_ack_cwr(sk, *ce_state);
- __tcp_send_ack(sk, *prior_rcv_nxt);
+ __tcp_send_ack(sk, *prior_rcv_nxt, 0);
}
inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_NOW;
}
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 65bbfadbee67..dbe70a114b1d 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3512,7 +3512,7 @@ static void tcp_send_challenge_ack(struct sock *sk, const struct sk_buff *skb)
if (count > 0) {
WRITE_ONCE(challenge_count, count - 1);
NET_INC_STATS(net, LINUX_MIB_TCPCHALLENGEACK);
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
}
}
@@ -4255,12 +4255,12 @@ void tcp_fin(struct sock *sk)
* happens, we must ack the received FIN and
* enter the CLOSING state.
*/
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
tcp_set_state(sk, TCP_CLOSING);
break;
case TCP_FIN_WAIT2:
/* Received a FIN -- send ACK and enter TIME_WAIT. */
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
tcp_time_wait(sk, TCP_TIME_WAIT, 0);
break;
default:
@@ -4367,7 +4367,7 @@ static void tcp_send_dupack(struct sock *sk, const struct sk_buff *skb)
}
}
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
}
/* These routines update the SACK block as out-of-order packets arrive or
@@ -4427,7 +4427,7 @@ static void tcp_sack_new_ofo_skb(struct sock *sk, u32 seq, u32 end_seq)
*/
if (this_sack >= TCP_NUM_SACKS) {
if (tp->compressed_ack > TCP_FASTRETRANS_THRESH)
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
this_sack--;
tp->rx_opt.num_sacks--;
sp--;
@@ -5331,7 +5331,7 @@ static void __tcp_ack_snd_check(struct sock *sk, int ofo_possible)
/* Protocol state mandates a one-time immediate ACK */
inet_csk(sk)->icsk_ack.pending & ICSK_ACK_NOW) {
send_now:
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
return;
}
@@ -6126,7 +6126,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
tcp_drop(sk, skb);
return 0;
} else {
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
}
return -1;
}
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index a1414d1a8ef1..c8d0a7baf2d4 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3741,7 +3741,7 @@ void tcp_send_delayed_ack(struct sock *sk)
*/
if (icsk->icsk_ack.blocked ||
time_before_eq(icsk->icsk_ack.timeout, jiffies + (ato >> 2))) {
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
return;
}
@@ -3754,7 +3754,7 @@ void tcp_send_delayed_ack(struct sock *sk)
}
/* This routine sends an ack and also updates the window. */
-void __tcp_send_ack(struct sock *sk, u32 rcv_nxt)
+void __tcp_send_ack(struct sock *sk, u32 rcv_nxt, u16 flags)
{
struct sk_buff *buff;
@@ -3778,7 +3778,7 @@ void __tcp_send_ack(struct sock *sk, u32 rcv_nxt)
/* Reserve space for headers and prepare control bits. */
skb_reserve(buff, MAX_TCP_HEADER);
- tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPHDR_ACK);
+ tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPHDR_ACK | flags);
/* We do not want pure acks influencing TCP Small Queues or fq/pacing
* too much.
@@ -3791,9 +3791,9 @@ void __tcp_send_ack(struct sock *sk, u32 rcv_nxt)
}
EXPORT_SYMBOL_GPL(__tcp_send_ack);
-void tcp_send_ack(struct sock *sk)
+void tcp_send_ack(struct sock *sk, u16 flags)
{
- __tcp_send_ack(sk, tcp_sk(sk)->rcv_nxt);
+ __tcp_send_ack(sk, tcp_sk(sk)->rcv_nxt, flags);
}
/* This routine sends a packet with an out of date sequence
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index c3f26dcd6704..f37289216d37 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -302,7 +302,7 @@ void tcp_delack_timer_handler(struct sock *sk)
icsk->icsk_ack.ato = TCP_ATO_MIN;
}
tcp_mstamp_refresh(tcp_sk(sk));
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKS);
}
@@ -754,7 +754,7 @@ static enum hrtimer_restart tcp_compressed_ack_kick(struct hrtimer *timer)
bh_lock_sock(sk);
if (!sock_owned_by_user(sk)) {
if (tp->compressed_ack > TCP_FASTRETRANS_THRESH)
- tcp_send_ack(sk);
+ tcp_send_ack(sk, 0);
} else {
if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED,
&sk->sk_tsq_flags))
--
2.20.1
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