abc/lwip
1
0
Fork 0
mirror of https://git.savannah.nongnu.org/git/lwip.git synced 2026-05-28 19:18:32 +08:00
Code Issues Packages Projects Releases Wiki Activity

tcp: persist timer re-work (bug #50837)

Browse Source 
This re-works the persist timer to have the following behavior:

  1) Only start persist timer when a buffered segment doesn't fit within
     the current window and there is no in-fligh data.  Previously, the
     persist timer was always started when the window went to zero even
     if there was no buffered data (since timer was managed in receive
     pathway rather than transmit pathway)
  2) Upon first fire of persist timer, fill the remaining window if
     non-zero by splitting the unsent segment.  If split segment is sent,
     persist timer is stopped, RTO timer is now ensuring reliable window
     updates
  3) If window is already zero when persist timer fires, send 1 byte probe
  4) Persist timer and zero window probe should only be active when the
     following are true:
       * no in-flight data (pcb->unacked == NULL)
       * when there is buffered data (pcb->unsent != NULL)
       * when pcb->unsent->len > pcb->snd_wnd
This commit is contained in:
Joel Cunningham
2017-08-04 12:50:47 -05:00
parent 2e4867fcde
commit f582c88339
6 changed files with 360 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
src/include/lwip/priv/tcp_priv.h
View File

@@ -468,6 +468,7 @@ void tcp_rst(const struct tcp_pcb* pcb, u32_t seqno, u32_t ackno,
u32_t tcp_next_iss(struct tcp_pcb *pcb);
err_t tcp_keepalive(struct tcp_pcb *pcb);
err_t tcp_split_unsent_seg(struct tcp_pcb *pcb, u16_t split);
err_t tcp_zero_window_probe(struct tcp_pcb *pcb);
void tcp_trigger_input_pcb_close(void);