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.
The benefits: * A lot of bug was fixed * Better and more reliable TCP state machine * Tcp clients becomes smaller/simpler * Data uploading was fixed (now it's possible to transmit a huge amount of data from the board to remote host)
Modification was verified with * firmware downloading via u-boot wget command * fastboot over tcp * netcat linux client * Firefox/Chrome/Edge using example web-server implementation
Changes v2: * cover letter was added * some patches were removed
Changes v3: * better cover letter
Changes v4: * fix bug in debug output * add more comments * code style fixes
Changes v5: * old patches were occasionally sent with v4 * add back web-server patches * fix bug in debug output * add more comments * code style fixes
Changes v6: * fix the wget test * improve description of "simplify tcp header filling code" patch
Changes v7: * fix include ordering * improve option descriptions * fix a lot of extra brackets and comparisons against NULL / 0 * add empty lines before final returns * fixed a bug with zero size httpd uploads
Changes v8: * [tcp] add function to restart rx inactivity timeout. This may help in the cases where remote peer waits for u-boot data, but u-boot is busy with long executing action * [httpd] add function returning underlying tcp stream from request id. This (with the above change) allows avoid connection break for the long processing post requests.
Changes v9: * rebase all changes on top of origin/next * update test/cmd/wget patch description (bad tcp ack/seq issue was already fixed in origin/next) * tcp: add rx/tx packet counters to a tcp_stream structure * wget: use tcp rx packet counter instead of own one * netcat: use tcp rx/tx packet counters instead of own one
Changes v10: * netcat: fix bug appeared after rx/tx packet counter addition * rebased on top of v2024.10
Changes v11: * fix spelling in cover letter
Changes v12: * rebase on top of master branch (3df6145db0e) * slightly change tcp->rx() & tcp->tx() callback declarations, this allow us to terminate a connection if something goes wrong in rx/tx paths. * set net_boot_file_size variable in httpd_upload * set filesize env variable to a proper value netcat and httpd_upload
Changes v13: * rebase on top of master branch (8573ea41058) * remove netcat support * remove example httpd server implementation
Mikhail Kshevetskiy (10): 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 test/cmd/wget: fix the test net/tcp: simplify tcp header filling code net/tcp: define a fallback value for rcv_wnd size net/net: fix include ordering
arch/sandbox/include/asm/eth.h | 4 + include/net-legacy.h | 5 +- include/net/tcp.h | 258 ++++++- include/net/wget.h | 8 - net/fastboot_tcp.c | 193 ++--- net/net.c | 45 +- net/tcp.c | 1297 ++++++++++++++++++++++---------- net/wget.c | 465 ++++-------- test/cmd/wget.c | 58 +- 9 files changed, 1444 insertions(+), 889 deletions(-)