tcp: introduce tcp_skb_timestamp_us() helper
There are few places where TCP reads skb->skb_mstamp expecting a value in usec unit. skb->tstamp (aka skb->skb_mstamp) will soon store CLOCK_TAI nsec value. Add tcp_skb_timestamp_us() to provide proper conversion when needed. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -774,6 +774,12 @@ static inline u32 tcp_skb_timestamp(const struct sk_buff *skb)
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return div_u64(skb->skb_mstamp, USEC_PER_SEC / TCP_TS_HZ);
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}
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/* provide the departure time in us unit */
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static inline u64 tcp_skb_timestamp_us(const struct sk_buff *skb)
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{
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return skb->skb_mstamp;
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}
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#define tcp_flag_byte(th) (((u_int8_t *)th)[13])
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@ -1940,7 +1946,7 @@ static inline s64 tcp_rto_delta_us(const struct sock *sk)
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{
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const struct sk_buff *skb = tcp_rtx_queue_head(sk);
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u32 rto = inet_csk(sk)->icsk_rto;
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u64 rto_time_stamp_us = skb->skb_mstamp + jiffies_to_usecs(rto);
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u64 rto_time_stamp_us = tcp_skb_timestamp_us(skb) + jiffies_to_usecs(rto);
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return rto_time_stamp_us - tcp_sk(sk)->tcp_mstamp;
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}
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@ -1305,7 +1305,7 @@ static bool tcp_shifted_skb(struct sock *sk, struct sk_buff *prev,
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*/
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tcp_sacktag_one(sk, state, TCP_SKB_CB(skb)->sacked,
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start_seq, end_seq, dup_sack, pcount,
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skb->skb_mstamp);
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tcp_skb_timestamp_us(skb));
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tcp_rate_skb_delivered(sk, skb, state->rate);
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if (skb == tp->lost_skb_hint)
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@ -1580,7 +1580,7 @@ static struct sk_buff *tcp_sacktag_walk(struct sk_buff *skb, struct sock *sk,
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TCP_SKB_CB(skb)->end_seq,
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dup_sack,
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tcp_skb_pcount(skb),
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skb->skb_mstamp);
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tcp_skb_timestamp_us(skb));
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tcp_rate_skb_delivered(sk, skb, state->rate);
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if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
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list_del_init(&skb->tcp_tsorted_anchor);
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@ -3103,7 +3103,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
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tp->retrans_out -= acked_pcount;
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flag |= FLAG_RETRANS_DATA_ACKED;
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} else if (!(sacked & TCPCB_SACKED_ACKED)) {
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last_ackt = skb->skb_mstamp;
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last_ackt = tcp_skb_timestamp_us(skb);
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WARN_ON_ONCE(last_ackt == 0);
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if (!first_ackt)
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first_ackt = last_ackt;
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@ -3121,7 +3121,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
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tp->delivered += acked_pcount;
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if (!tcp_skb_spurious_retrans(tp, skb))
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tcp_rack_advance(tp, sacked, scb->end_seq,
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skb->skb_mstamp);
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tcp_skb_timestamp_us(skb));
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}
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if (sacked & TCPCB_LOST)
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tp->lost_out -= acked_pcount;
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@ -3215,7 +3215,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, u32 prior_fack,
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tp->lost_cnt_hint -= min(tp->lost_cnt_hint, delta);
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}
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} else if (skb && rtt_update && sack_rtt_us >= 0 &&
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sack_rtt_us > tcp_stamp_us_delta(tp->tcp_mstamp, skb->skb_mstamp)) {
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sack_rtt_us > tcp_stamp_us_delta(tp->tcp_mstamp,
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tcp_skb_timestamp_us(skb))) {
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/* Do not re-arm RTO if the sack RTT is measured from data sent
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* after when the head was last (re)transmitted. Otherwise the
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* timeout may continue to extend in loss recovery.
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@ -544,7 +544,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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BUG_ON(!skb);
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tcp_mstamp_refresh(tp);
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delta_us = (u32)(tp->tcp_mstamp - skb->skb_mstamp);
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delta_us = (u32)(tp->tcp_mstamp - tcp_skb_timestamp_us(skb));
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remaining = icsk->icsk_rto -
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usecs_to_jiffies(delta_us);
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@ -1966,7 +1966,7 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
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head = tcp_rtx_queue_head(sk);
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if (!head)
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goto send_now;
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age = tcp_stamp_us_delta(tp->tcp_mstamp, head->skb_mstamp);
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age = tcp_stamp_us_delta(tp->tcp_mstamp, tcp_skb_timestamp_us(head));
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/* If next ACK is likely to come too late (half srtt), do not defer */
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if (age < (tp->srtt_us >> 4))
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goto send_now;
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@ -55,8 +55,10 @@ void tcp_rate_skb_sent(struct sock *sk, struct sk_buff *skb)
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* bandwidth estimate.
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*/
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if (!tp->packets_out) {
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tp->first_tx_mstamp = skb->skb_mstamp;
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tp->delivered_mstamp = skb->skb_mstamp;
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u64 tstamp_us = tcp_skb_timestamp_us(skb);
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tp->first_tx_mstamp = tstamp_us;
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tp->delivered_mstamp = tstamp_us;
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}
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TCP_SKB_CB(skb)->tx.first_tx_mstamp = tp->first_tx_mstamp;
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@ -88,13 +90,12 @@ void tcp_rate_skb_delivered(struct sock *sk, struct sk_buff *skb,
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rs->is_app_limited = scb->tx.is_app_limited;
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rs->is_retrans = scb->sacked & TCPCB_RETRANS;
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/* Record send time of most recently ACKed packet: */
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tp->first_tx_mstamp = tcp_skb_timestamp_us(skb);
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/* Find the duration of the "send phase" of this window: */
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rs->interval_us = tcp_stamp_us_delta(
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skb->skb_mstamp,
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rs->interval_us = tcp_stamp_us_delta(tp->first_tx_mstamp,
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scb->tx.first_tx_mstamp);
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/* Record send time of most recently ACKed packet: */
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tp->first_tx_mstamp = skb->skb_mstamp;
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}
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/* Mark off the skb delivered once it's sacked to avoid being
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* used again when it's cumulatively acked. For acked packets
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@ -50,7 +50,7 @@ static u32 tcp_rack_reo_wnd(const struct sock *sk)
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s32 tcp_rack_skb_timeout(struct tcp_sock *tp, struct sk_buff *skb, u32 reo_wnd)
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{
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return tp->rack.rtt_us + reo_wnd -
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tcp_stamp_us_delta(tp->tcp_mstamp, skb->skb_mstamp);
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tcp_stamp_us_delta(tp->tcp_mstamp, tcp_skb_timestamp_us(skb));
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}
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/* RACK loss detection (IETF draft draft-ietf-tcpm-rack-01):
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@ -91,7 +91,8 @@ static void tcp_rack_detect_loss(struct sock *sk, u32 *reo_timeout)
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!(scb->sacked & TCPCB_SACKED_RETRANS))
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continue;
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if (!tcp_rack_sent_after(tp->rack.mstamp, skb->skb_mstamp,
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if (!tcp_rack_sent_after(tp->rack.mstamp,
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tcp_skb_timestamp_us(skb),
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tp->rack.end_seq, scb->end_seq))
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break;
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