[GitHub] [incubator-nuttx] anchao commented on pull request #6562: net/tcp: fix regression of invalid update the rexmit_seq in buffer mode

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anchao commented on PR #6562:
URL: https://github.com/apache/incubator-nuttx/pull/6562#issuecomment-1180223620

   > > > I am sorry I do not understand what do you mean about complaining.
   > > 
   > > 
   > > I have no idea, here are tcp rto implement of LWIP for you reference:
   > 
   > Do you mean it implements retransmitting everything from the beginning 
each time the same as the original algorithm in NuttX?
   
   There are 3 implementations of LWIP, handle with different scenarios 
respectively:
   
   RTO: Requeue all unacked segments for retransmission
   
   ```
   /**
    * Requeue all unacked segments for retransmission
    *
    * Called by tcp_slowtmr() for slow retransmission.
    *
    * @param pcb the tcp_pcb for which to re-enqueue all unacked segments
    */
   void
   tcp_rexmit_rto_commit(struct tcp_pcb *pcb)
   ```
   
   
   fast retransmit: Requeue the first unacked segment for retransmission
   
   ```
   /**
    * Requeue the first unacked segment for retransmission
    *
    * Called by tcp_receive() for fast retransmit.
    *
    * @param pcb the tcp_pcb for which to retransmit the first unacked segment
    */
   err_t
   tcp_rexmit(struct tcp_pcb *pcb)
   ```
   
   three dupacks received: andle retransmission after three dupacks received
   
   ```
   /**
    * Handle retransmission after three dupacks received
    *
    * @param pcb the tcp_pcb for which to retransmit the first unacked segment
    */
   void
   tcp_rexmit_fast(struct tcp_pcb *pcb)
   ```


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