mirror of https://gitee.com/openkylin/linux.git
tcp: remove TCP_SKB_CB(skb)->when
After commit 740b0f1841 ("tcp: switch rtt estimations to usec resolution"),
we no longer need to maintain timestamps in two different fields.
TCP_SKB_CB(skb)->when can be removed, as same information sits in skb_mstamp.stamp_jiffies
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
04317dafd1
commit
7faee5c0d5
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@ -672,6 +672,12 @@ void tcp_send_window_probe(struct sock *sk);
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*/
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#define tcp_time_stamp ((__u32)(jiffies))
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static inline u32 tcp_skb_timestamp(const struct sk_buff *skb)
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{
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return skb->skb_mstamp.stamp_jiffies;
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}
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#define tcp_flag_byte(th) (((u_int8_t *)th)[13])
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#define TCPHDR_FIN 0x01
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@ -698,12 +704,7 @@ struct tcp_skb_cb {
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} header; /* For incoming frames */
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__u32 seq; /* Starting sequence number */
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__u32 end_seq; /* SEQ + FIN + SYN + datalen */
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union {
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/* used in output path */
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__u32 when; /* used to compute rtt's */
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/* used in input path */
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__u32 tcp_tw_isn; /* isn chosen by tcp_timewait_state_process() */
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};
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__u32 tcp_tw_isn; /* isn chosen by tcp_timewait_state_process() */
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__u8 tcp_flags; /* TCP header flags. (tcp[13]) */
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__u8 sacked; /* State flags for SACK/FACK. */
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@ -2967,7 +2967,8 @@ void tcp_rearm_rto(struct sock *sk)
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if (icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
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icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
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struct sk_buff *skb = tcp_write_queue_head(sk);
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const u32 rto_time_stamp = TCP_SKB_CB(skb)->when + rto;
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const u32 rto_time_stamp =
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tcp_skb_timestamp(skb) + rto;
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s32 delta = (s32)(rto_time_stamp - tcp_time_stamp);
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/* delta may not be positive if the socket is locked
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* when the retrans timer fires and is rescheduled.
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@ -437,8 +437,9 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
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skb = tcp_write_queue_head(sk);
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BUG_ON(!skb);
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remaining = icsk->icsk_rto - min(icsk->icsk_rto,
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tcp_time_stamp - TCP_SKB_CB(skb)->when);
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remaining = icsk->icsk_rto -
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min(icsk->icsk_rto,
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tcp_time_stamp - tcp_skb_timestamp(skb));
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if (remaining) {
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inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
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@ -550,7 +550,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
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if (likely(sysctl_tcp_timestamps && *md5 == NULL)) {
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opts->options |= OPTION_TS;
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opts->tsval = TCP_SKB_CB(skb)->when + tp->tsoffset;
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opts->tsval = tcp_skb_timestamp(skb) + tp->tsoffset;
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opts->tsecr = tp->rx_opt.ts_recent;
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remaining -= TCPOLEN_TSTAMP_ALIGNED;
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}
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@ -618,7 +618,7 @@ static unsigned int tcp_synack_options(struct sock *sk,
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}
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if (likely(ireq->tstamp_ok)) {
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opts->options |= OPTION_TS;
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opts->tsval = TCP_SKB_CB(skb)->when;
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opts->tsval = tcp_skb_timestamp(skb);
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opts->tsecr = req->ts_recent;
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remaining -= TCPOLEN_TSTAMP_ALIGNED;
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}
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@ -647,7 +647,6 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb
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struct tcp_out_options *opts,
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struct tcp_md5sig_key **md5)
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{
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struct tcp_skb_cb *tcb = skb ? TCP_SKB_CB(skb) : NULL;
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struct tcp_sock *tp = tcp_sk(sk);
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unsigned int size = 0;
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unsigned int eff_sacks;
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@ -666,7 +665,7 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb
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if (likely(tp->rx_opt.tstamp_ok)) {
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opts->options |= OPTION_TS;
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opts->tsval = tcb ? tcb->when + tp->tsoffset : 0;
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opts->tsval = skb ? tcp_skb_timestamp(skb) + tp->tsoffset : 0;
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opts->tsecr = tp->rx_opt.ts_recent;
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size += TCPOLEN_TSTAMP_ALIGNED;
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}
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@ -886,8 +885,6 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
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skb = skb_clone(skb, gfp_mask);
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if (unlikely(!skb))
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return -ENOBUFS;
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/* Our usage of tstamp should remain private */
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skb->tstamp.tv64 = 0;
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}
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inet = inet_sk(sk);
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@ -975,7 +972,10 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
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TCP_ADD_STATS(sock_net(sk), TCP_MIB_OUTSEGS,
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tcp_skb_pcount(skb));
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/* Our usage of tstamp should remain private */
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skb->tstamp.tv64 = 0;
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err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl);
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if (likely(err <= 0))
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return err;
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@ -1149,7 +1149,6 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
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/* Looks stupid, but our code really uses when of
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* skbs, which it never sent before. --ANK
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*/
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TCP_SKB_CB(buff)->when = TCP_SKB_CB(skb)->when;
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buff->tstamp = skb->tstamp;
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tcp_fragment_tstamp(skb, buff);
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@ -1874,8 +1873,8 @@ static int tcp_mtu_probe(struct sock *sk)
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tcp_init_tso_segs(sk, nskb, nskb->len);
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/* We're ready to send. If this fails, the probe will
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* be resegmented into mss-sized pieces by tcp_write_xmit(). */
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TCP_SKB_CB(nskb)->when = tcp_time_stamp;
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* be resegmented into mss-sized pieces by tcp_write_xmit().
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*/
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if (!tcp_transmit_skb(sk, nskb, 1, GFP_ATOMIC)) {
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/* Decrement cwnd here because we are sending
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* effectively two packets. */
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@ -1935,8 +1934,8 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
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BUG_ON(!tso_segs);
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if (unlikely(tp->repair) && tp->repair_queue == TCP_SEND_QUEUE) {
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/* "when" is used as a start point for the retransmit timer */
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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/* "skb_mstamp" is used as a start point for the retransmit timer */
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skb_mstamp_get(&skb->skb_mstamp);
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goto repair; /* Skip network transmission */
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}
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@ -2000,8 +1999,6 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
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unlikely(tso_fragment(sk, skb, limit, mss_now, gfp)))
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break;
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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if (unlikely(tcp_transmit_skb(sk, skb, 1, gfp)))
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break;
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@ -2499,7 +2496,6 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
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/* Make a copy, if the first transmission SKB clone we made
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* is still in somebody's hands, else make a clone.
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*/
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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/* make sure skb->data is aligned on arches that require it
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* and check if ack-trimming & collapsing extended the headroom
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@ -2544,7 +2540,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
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/* Save stamp of the first retransmit. */
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if (!tp->retrans_stamp)
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tp->retrans_stamp = TCP_SKB_CB(skb)->when;
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tp->retrans_stamp = tcp_skb_timestamp(skb);
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/* snd_nxt is stored to detect loss of retransmitted segment,
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* see tcp_input.c tcp_sacktag_write_queue().
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@ -2752,7 +2748,6 @@ void tcp_send_active_reset(struct sock *sk, gfp_t priority)
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tcp_init_nondata_skb(skb, tcp_acceptable_seq(sk),
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TCPHDR_ACK | TCPHDR_RST);
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/* Send it off. */
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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if (tcp_transmit_skb(sk, skb, 0, priority))
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NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTFAILED);
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@ -2791,7 +2786,6 @@ int tcp_send_synack(struct sock *sk)
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TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ACK;
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TCP_ECN_send_synack(tcp_sk(sk), skb);
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}
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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return tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
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}
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@ -2835,10 +2829,10 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
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memset(&opts, 0, sizeof(opts));
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#ifdef CONFIG_SYN_COOKIES
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if (unlikely(req->cookie_ts))
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TCP_SKB_CB(skb)->when = cookie_init_timestamp(req);
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skb->skb_mstamp.stamp_jiffies = cookie_init_timestamp(req);
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else
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#endif
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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skb_mstamp_get(&skb->skb_mstamp);
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tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, &md5,
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foc) + sizeof(*th);
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@ -3086,7 +3080,7 @@ int tcp_connect(struct sock *sk)
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skb_reserve(buff, MAX_TCP_HEADER);
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tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN);
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tp->retrans_stamp = TCP_SKB_CB(buff)->when = tcp_time_stamp;
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tp->retrans_stamp = tcp_time_stamp;
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tcp_connect_queue_skb(sk, buff);
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TCP_ECN_send_syn(sk, buff);
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@ -3194,7 +3188,7 @@ void tcp_send_ack(struct sock *sk)
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tcp_init_nondata_skb(buff, tcp_acceptable_seq(sk), TCPHDR_ACK);
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/* Send it off, this clears delayed acks for us. */
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TCP_SKB_CB(buff)->when = tcp_time_stamp;
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skb_mstamp_get(&buff->skb_mstamp);
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tcp_transmit_skb(sk, buff, 0, sk_gfp_atomic(sk, GFP_ATOMIC));
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}
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@ -3226,7 +3220,7 @@ static int tcp_xmit_probe_skb(struct sock *sk, int urgent)
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* send it.
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*/
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tcp_init_nondata_skb(skb, tp->snd_una - !urgent, TCPHDR_ACK);
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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skb_mstamp_get(&skb->skb_mstamp);
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return tcp_transmit_skb(sk, skb, 0, GFP_ATOMIC);
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}
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@ -3270,7 +3264,6 @@ int tcp_write_wakeup(struct sock *sk)
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tcp_set_skb_tso_segs(sk, skb, mss);
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TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH;
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TCP_SKB_CB(skb)->when = tcp_time_stamp;
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err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
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if (!err)
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tcp_event_new_data_sent(sk, skb);
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@ -135,10 +135,9 @@ static bool retransmits_timed_out(struct sock *sk,
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if (!inet_csk(sk)->icsk_retransmits)
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return false;
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if (unlikely(!tcp_sk(sk)->retrans_stamp))
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start_ts = TCP_SKB_CB(tcp_write_queue_head(sk))->when;
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else
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start_ts = tcp_sk(sk)->retrans_stamp;
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start_ts = tcp_sk(sk)->retrans_stamp;
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if (unlikely(!start_ts))
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start_ts = tcp_skb_timestamp(tcp_write_queue_head(sk));
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if (likely(timeout == 0)) {
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linear_backoff_thresh = ilog2(TCP_RTO_MAX/rto_base);
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