tcp: export sender limits chronographs to TCP_INFO
This patch exports all the sender chronograph measurements collected in the previous patches to TCP_INFO interface. Note that busy time exported includes all the other sending limits (rwnd-limited, sndbuf-limited). Internally the time unit is jiffy but externally the measurements are in microseconds for future extensions. Signed-off-by: Francis Yan <francisyyan@gmail.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -214,6 +214,10 @@ struct tcp_info {
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__u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
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__u64 tcpi_delivery_rate;
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__u64 tcpi_busy_time; /* Time (usec) busy sending data */
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__u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */
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__u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
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};
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/* for TCP_MD5SIG socket option */
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@ -2708,6 +2708,25 @@ int compat_tcp_setsockopt(struct sock *sk, int level, int optname,
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EXPORT_SYMBOL(compat_tcp_setsockopt);
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#endif
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static void tcp_get_info_chrono_stats(const struct tcp_sock *tp,
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struct tcp_info *info)
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{
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u64 stats[__TCP_CHRONO_MAX], total = 0;
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enum tcp_chrono i;
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for (i = TCP_CHRONO_BUSY; i < __TCP_CHRONO_MAX; ++i) {
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stats[i] = tp->chrono_stat[i - 1];
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if (i == tp->chrono_type)
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stats[i] += tcp_time_stamp - tp->chrono_start;
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stats[i] *= USEC_PER_SEC / HZ;
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total += stats[i];
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}
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info->tcpi_busy_time = total;
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info->tcpi_rwnd_limited = stats[TCP_CHRONO_RWND_LIMITED];
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info->tcpi_sndbuf_limited = stats[TCP_CHRONO_SNDBUF_LIMITED];
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}
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/* Return information about state of tcp endpoint in API format. */
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void tcp_get_info(struct sock *sk, struct tcp_info *info)
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{
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@ -2800,6 +2819,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
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info->tcpi_bytes_acked = tp->bytes_acked;
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info->tcpi_bytes_received = tp->bytes_received;
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info->tcpi_notsent_bytes = max_t(int, 0, tp->write_seq - tp->snd_nxt);
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tcp_get_info_chrono_stats(tp, info);
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unlock_sock_fast(sk, slow);
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