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When inserting an EDT packet with time before flow->time_next_packet, update the flow and possibly queue next delivery time. Reinsert the flow into the q->delayed rb-tree to position correctly and to have fq_check_throttled set wake-up at the right next time. Factor RB tree insertion out fq_flow_set_throttled to avoid open coding twice. EDT packets do not take precedence over queue rate limit. Skip this new step if a queue limit is set. EDT packets do take precedence over per-socket rate limits, as can be seen from fq_dequeue reading sk_pacing_rate if !skb->tstamp. With this change the so_txtime selftest sends packets in the expected order. Signed-off-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20260526134109.2624493-1-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>