Re: [PATCH v12 00/13] net: tcp: improve tcp support in legacy stack

On Mon, Oct 28, 2024 at 05:31:30PM +0300, Mikhail Kshevetskiy wrote:

Legacy TCP stack is bad. Here are some of the known issues:

• tcp packet from other connection can break a current one
• tcp send sequence always starts from zero
• bad tcp options processing
• strange assumptions on packet size for selective acknowledge
• tcp interface assumes one of the two scenarios:
  • data downloading from remote host to a board
  • request-response exchange with a small packets
  so it's not possible to upload large amount of data from the board to remote host.
• wget test generate bad tcp stream, test should fail but it passes instead

This series of patches fixes all of the above issues.

I know Peter asked on the last one, but I want to ask as well. With lwIP merged, why do we want to add features to the old stack? I can see fixing issues, but not adding new functionality as well. Thanks.