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Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c83
1 files changed, 39 insertions, 44 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 730bc44dbad9..4522579aaca2 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -165,13 +165,16 @@ static void tcp_event_data_sent(struct tcp_sock *tp,
if (tcp_packets_in_flight(tp) == 0)
tcp_ca_event(sk, CA_EVENT_TX_START);
- tp->lsndtime = now;
-
- /* If it is a reply for ato after last received
- * packet, enter pingpong mode.
+ /* If this is the first data packet sent in response to the
+ * previous received data,
+ * and it is a reply for ato after last received packet,
+ * increase pingpong count.
*/
- if ((u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato)
- icsk->icsk_ack.pingpong = 1;
+ if (before(tp->lsndtime, icsk->icsk_ack.lrcvtime) &&
+ (u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato)
+ inet_csk_inc_pingpong_cnt(sk);
+
+ tp->lsndtime = now;
}
/* Account for an ACK we sent. */
@@ -594,7 +597,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
*md5 = NULL;
#ifdef CONFIG_TCP_MD5SIG
- if (static_key_false(&tcp_md5_needed) &&
+ if (static_branch_unlikely(&tcp_md5_needed) &&
rcu_access_pointer(tp->md5sig_info)) {
*md5 = tp->af_specific->md5_lookup(sk, sk);
if (*md5) {
@@ -731,7 +734,7 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb
*md5 = NULL;
#ifdef CONFIG_TCP_MD5SIG
- if (static_key_false(&tcp_md5_needed) &&
+ if (static_branch_unlikely(&tcp_md5_needed) &&
rcu_access_pointer(tp->md5sig_info)) {
*md5 = tp->af_specific->md5_lookup(sk, sk);
if (*md5) {
@@ -980,7 +983,6 @@ static void tcp_update_skb_after_send(struct sock *sk, struct sk_buff *skb,
{
struct tcp_sock *tp = tcp_sk(sk);
- skb->skb_mstamp_ns = tp->tcp_wstamp_ns;
if (sk->sk_pacing_status != SK_PACING_NONE) {
unsigned long rate = sk->sk_pacing_rate;
@@ -1028,7 +1030,9 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
BUG_ON(!skb || !tcp_skb_pcount(skb));
tp = tcp_sk(sk);
-
+ prior_wstamp = tp->tcp_wstamp_ns;
+ tp->tcp_wstamp_ns = max(tp->tcp_wstamp_ns, tp->tcp_clock_cache);
+ skb->skb_mstamp_ns = tp->tcp_wstamp_ns;
if (clone_it) {
TCP_SKB_CB(skb)->tx.in_flight = TCP_SKB_CB(skb)->end_seq
- tp->snd_una;
@@ -1045,11 +1049,6 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
return -ENOBUFS;
}
- prior_wstamp = tp->tcp_wstamp_ns;
- tp->tcp_wstamp_ns = max(tp->tcp_wstamp_ns, tp->tcp_clock_cache);
-
- skb->skb_mstamp_ns = tp->tcp_wstamp_ns;
-
inet = inet_sk(sk);
tcb = TCP_SKB_CB(skb);
memset(&opts, 0, sizeof(opts));
@@ -1847,17 +1846,17 @@ static bool tcp_snd_wnd_test(const struct tcp_sock *tp,
* know that all the data is in scatter-gather pages, and that the
* packet has never been sent out before (and thus is not cloned).
*/
-static int tso_fragment(struct sock *sk, enum tcp_queue tcp_queue,
- struct sk_buff *skb, unsigned int len,
+static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
unsigned int mss_now, gfp_t gfp)
{
- struct sk_buff *buff;
int nlen = skb->len - len;
+ struct sk_buff *buff;
u8 flags;
/* All of a TSO frame must be composed of paged data. */
if (skb->len != skb->data_len)
- return tcp_fragment(sk, tcp_queue, skb, len, mss_now, gfp);
+ return tcp_fragment(sk, TCP_FRAG_IN_WRITE_QUEUE,
+ skb, len, mss_now, gfp);
buff = sk_stream_alloc_skb(sk, 0, gfp, true);
if (unlikely(!buff))
@@ -1893,7 +1892,7 @@ static int tso_fragment(struct sock *sk, enum tcp_queue tcp_queue,
/* Link BUFF into the send queue. */
__skb_header_release(buff);
- tcp_insert_write_queue_after(skb, buff, sk, tcp_queue);
+ tcp_insert_write_queue_after(skb, buff, sk, TCP_FRAG_IN_WRITE_QUEUE);
return 0;
}
@@ -2347,6 +2346,7 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
/* "skb_mstamp_ns" is used as a start point for the retransmit timer */
skb->skb_mstamp_ns = tp->tcp_wstamp_ns = tp->tcp_clock_cache;
list_move_tail(&skb->tcp_tsorted_anchor, &tp->tsorted_sent_queue);
+ tcp_init_tso_segs(skb, mss_now);
goto repair; /* Skip network transmission */
}
@@ -2391,8 +2391,7 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
nonagle);
if (skb->len > limit &&
- unlikely(tso_fragment(sk, TCP_FRAG_IN_WRITE_QUEUE,
- skb, limit, mss_now, gfp)))
+ unlikely(tso_fragment(sk, skb, limit, mss_now, gfp)))
break;
if (tcp_small_queue_check(sk, skb, 0))
@@ -2937,12 +2936,16 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
}
+ /* To avoid taking spuriously low RTT samples based on a timestamp
+ * for a transmit that never happened, always mark EVER_RETRANS
+ */
+ TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS;
+
if (BPF_SOCK_OPS_TEST_FLAG(tp, BPF_SOCK_OPS_RETRANS_CB_FLAG))
tcp_call_bpf_3arg(sk, BPF_SOCK_OPS_RETRANS_CB,
TCP_SKB_CB(skb)->seq, segs, err);
if (likely(!err)) {
- TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS;
trace_tcp_retransmit_skb(sk, skb);
} else if (err != -EBUSY) {
NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL, segs);
@@ -2963,13 +2966,12 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
#endif
TCP_SKB_CB(skb)->sacked |= TCPCB_RETRANS;
tp->retrans_out += tcp_skb_pcount(skb);
-
- /* Save stamp of the first retransmit. */
- if (!tp->retrans_stamp)
- tp->retrans_stamp = tcp_skb_timestamp(skb);
-
}
+ /* Save stamp of the first (attempted) retransmit. */
+ if (!tp->retrans_stamp)
+ tp->retrans_stamp = tcp_skb_timestamp(skb);
+
if (tp->undo_retrans < 0)
tp->undo_retrans = 0;
tp->undo_retrans += tcp_skb_pcount(skb);
@@ -3456,6 +3458,7 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
skb_trim(syn_data, copied);
space = copied;
}
+ skb_zcopy_set(syn_data, fo->uarg, NULL);
}
/* No more data pending in inet_wait_for_connect() */
if (space == fo->size)
@@ -3569,7 +3572,7 @@ void tcp_send_delayed_ack(struct sock *sk)
const struct tcp_sock *tp = tcp_sk(sk);
int max_ato = HZ / 2;
- if (icsk->icsk_ack.pingpong ||
+ if (inet_csk_in_pingpong_mode(sk) ||
(icsk->icsk_ack.pending & ICSK_ACK_PUSHED))
max_ato = TCP_DELACK_MAX;
@@ -3750,7 +3753,7 @@ void tcp_send_probe0(struct sock *sk)
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct net *net = sock_net(sk);
- unsigned long probe_max;
+ unsigned long timeout;
int err;
err = tcp_write_wakeup(sk, LINUX_MIB_TCPWINPROBE);
@@ -3762,26 +3765,18 @@ void tcp_send_probe0(struct sock *sk)
return;
}
+ icsk->icsk_probes_out++;
if (err <= 0) {
if (icsk->icsk_backoff < net->ipv4.sysctl_tcp_retries2)
icsk->icsk_backoff++;
- icsk->icsk_probes_out++;
- probe_max = TCP_RTO_MAX;
+ timeout = tcp_probe0_when(sk, TCP_RTO_MAX);
} else {
/* If packet was not sent due to local congestion,
- * do not backoff and do not remember icsk_probes_out.
- * Let local senders to fight for local resources.
- *
- * Use accumulated backoff yet.
+ * Let senders fight for local resources conservatively.
*/
- if (!icsk->icsk_probes_out)
- icsk->icsk_probes_out = 1;
- probe_max = TCP_RESOURCE_PROBE_INTERVAL;
- }
- tcp_reset_xmit_timer(sk, ICSK_TIME_PROBE0,
- tcp_probe0_when(sk, probe_max),
- TCP_RTO_MAX,
- NULL);
+ timeout = TCP_RESOURCE_PROBE_INTERVAL;
+ }
+ tcp_reset_xmit_timer(sk, ICSK_TIME_PROBE0, timeout, TCP_RTO_MAX, NULL);
}
int tcp_rtx_synack(const struct sock *sk, struct request_sock *req)