U-Boot support of LWIP is not ready for a moment, but we already have some kind of tcp support. Unfrotunately this support is really bad.
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 selectiv 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.
This series of patches fixes all of the above issuess.
The benefits: * A lot of bug was fixed * Better and more reliable TCP state machine * Tcp cliens becomes smaller/simpler * Data uploading was fixed (now it's possible to transmit a huge amount of data from the board to remote host) * Netcat over tcp was implemented. Netcat supports data downloading/uploading from/to remote host in client/server mode.
On the base of this changes a HTTPD/1.1 server for firmware upgrade was implemented (not included in this patch series).
Modification was verified with * netcat linux client. * Firefox/Chrome/Edge during web-based firmware upgrade
Changes v2: * cover letter was added * some patches were removed
Changes v3: * better cover letter
Mikhail Kshevetskiy (9): net/tcp: fix TCP options processing net/tcp: fix selective acknowledge net/tcp: put connection specific data into a tcp_stream structure net/tcp: add connection info to tcp_stream structure net/tcp: rename ack_edge and seq_init to more common rcv_nxt and irs net/tcp: improve tcp framework, use better state machine net/tcp: simplify tcp header filling code net/tcp: define a fallback value for rcv_wnd size net/netcat: add netcat over tcp support
cmd/Kconfig | 7 + cmd/net.c | 34 +- include/net.h | 7 +- include/net/netcat.h | 20 + include/net/tcp.h | 227 +++++++- include/net/wget.h | 8 - net/Makefile | 1 + net/fastboot_tcp.c | 190 +++---- net/net.c | 30 +- net/netcat.c | 159 ++++++ net/tcp.c | 1253 +++++++++++++++++++++++++++++------------- net/wget.c | 479 +++++----------- 12 files changed, 1538 insertions(+), 877 deletions(-) create mode 100644 include/net/netcat.h create mode 100644 net/netcat.c