advancing_rto 596 include/net/tcp.h bool tcp_schedule_loss_probe(struct sock *sk, bool advancing_rto); advancing_rto 2491 net/ipv4/tcp_output.c bool tcp_schedule_loss_probe(struct sock *sk, bool advancing_rto) advancing_rto 2529 net/ipv4/tcp_output.c rto_delta_us = advancing_rto ?