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tcp: fix rate_app_limited to default to 1 

The initial default value of 0 for tp->rate_app_limited was incorrect,
since a flow is indeed application-limited until it first sends
data. Fixing the default to be 1 is generally correct but also
specifically will help user-space applications avoid using the initial
tcpi_delivery_rate value of 0 that persists until the connection has
some non-zero bandwidth sample.

Fixes: eb8329e0a0 ("tcp: export data delivery rate")
Suggested-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David Morley <morleyd@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Tested-by: David Morley <morleyd@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Morley 2023-01-19 19:00:28 +00:00 committed by David S. Miller
parent d3e599c090
commit 300b655db1
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/tcp.c
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@ -435,6 +435,7 @@ void tcp_init_sock(struct sock *sk)
/* There's a bubble in the pipe until at least the first ACK. */
tp->app_limited = ~0U;
tp->rate_app_limited = 1;
/* See draft-stevens-tcpca-spec-01 for discussion of the
* initialization of these values.
@ -3178,6 +3179,7 @@ int tcp_disconnect(struct sock *sk, int flags)
tp->plb_rehash = 0;
/* There's a bubble in the pipe until at least the first ACK. */
tp->app_limited = ~0U;
tp->rate_app_limited = 1;
tp->rack.mstamp = 0;
tp->rack.advanced = 0;
tp->rack.reo_wnd_steps = 1;