forked from luck/tmp_suning_uos_patched
tcp: add tcpi_min_rtt and tcpi_notsent_bytes to tcp_info
tcpi_min_rtt reports the minimal rtt observed by TCP stack for the flow, in usec unit. Might be ~0U if not yet known. tcpi_notsent_bytes reports the amount of bytes in the write queue that were not yet sent. This is done in a single patch to not add a temporary 32bit padding hole in tcp_info. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -196,6 +196,9 @@ struct tcp_info {
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__u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
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__u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
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__u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
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__u32 tcpi_notsent_bytes;
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__u32 tcpi_min_rtt;
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};
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/* for TCP_MD5SIG socket option */
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@ -2642,6 +2642,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
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const struct inet_connection_sock *icsk = inet_csk(sk);
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u32 now = tcp_time_stamp;
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unsigned int start;
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int notsent_bytes;
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u64 rate64;
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u32 rate;
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@ -2722,6 +2723,11 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
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} while (u64_stats_fetch_retry_irq(&tp->syncp, start));
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info->tcpi_segs_out = tp->segs_out;
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info->tcpi_segs_in = tp->segs_in;
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notsent_bytes = READ_ONCE(tp->write_seq) - READ_ONCE(tp->snd_nxt);
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info->tcpi_notsent_bytes = max(0, notsent_bytes);
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info->tcpi_min_rtt = tcp_min_rtt(tp);
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}
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EXPORT_SYMBOL_GPL(tcp_get_info);
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