ERROR iroh_quinn_udp::imp: got transmit error, halting segmentation offload

2024-08-10T06:19:59.120474Z ERROR iroh_quinn_udp::imp: got transmit error, halting segmentation offload

I provide a server that will generate this file for you:

sendme receive blobacyeboyfhlszybnlqliyhvlbgkdnt5teybpm27yrpj6xahetgpbluajdnb2hi4dthixs6zlvo4ys2mjoojswyylzfzuxe33ifzxgk5dxn5zgwlrpaiafp3khwt2wqagavac6fp55ama6gzgbecgcklcx4ddcnyhuh5lf53uak4hgp754aquyz5slaqwlakq

this is a 1GB file that fails to download from the server,

the server says 2024-08-10T06:24:36.963867Z ERROR iroh_quinn_udp::imp: got transmit error, halting segmentation offload

qlm@qlmfb1:~/git/tmp$ sendme --version
sendme 0.13.0

qlm@qlmfb1:~/git/tmp$ uname --all
Linux qlmfb1 5.15.0-116-generic #126-Ubuntu SMP Mon Jul 1 10:14:24 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

qlm@qlmfb1:~/git/tmp$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.4 LTS
Release:        22.04
Codename:       jammy

looking at https://github.com/quinn-rs/quinn/blob/c0b1e281e3167d4f4c8496082cb1117c4a270ad8/quinn-udp/src/unix.rs#L288

and

https://www.ibm.com/docs/en/linux-on-systems?topic=offload-tcp-segmentation

I discover:

qlm@qlmfb1:~/git/tmp$ sudo ethtool -K enp0s3 tx on sg on tso on
Actual changes:
tx-scatter-gather: off [requested on]
tx-checksum-ipv4: off [requested on]
tx-checksum-ip-generic: off [requested on]
tx-checksum-ipv6: off [requested on]
tx-scatter-gather-fraglist: off [requested on]
tx-tcp-segmentation: off [requested on]
tx-tcp-ecn-segmentation: off [requested on]
tx-tcp-mangleid-segmentation: off [requested on]
tx-tcp6-segmentation: off [requested on]
tx-checksum-fcoe-crc: off [requested on]
tx-checksum-sctp: off [requested on]
Could not change any device features

and

qlm@qlmfb1:~/git/tmp$ sudo ethtool --offload enp0s3  rx on  tx on
Actual changes:
tx-checksum-ipv4: off [requested on]
tx-checksum-ip-generic: off [requested on]
tx-checksum-ipv6: off [requested on]
tx-checksum-fcoe-crc: off [requested on]
tx-checksum-sctp: off [requested on]
rx-checksum: off [requested on]
Could not change any device features

In other words, this platform does not support tcp segmentation,
is there a way to get sendme working in such case?

Reproduce the 1GB transfer with sendme 0.13.0 on Ubuntu 22.04 using the provided command, then inspect quinn-udp/src/unix.rs around the referenced line and the transmit-error path. Check how sendme behaves when segmentation and checksum offload cannot be enabled; done means the provided transfer completes successfully or the limitation is clearly handled.