lwIP | ttcp seems to have some problems on zynqmp_qemu with lwip stack (#3)

[Ning Yang (@yangn0)]

Ning Yang created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/issues/3



## Summary

`ttcp` seems to have some problems on `zynqmp_qemu` BSP with `lwip` stack.

tcp:
![image](/uploads/4b2ab750eb2021ca1052ec7a1aed19e1/image.png)
ttcp cannot print report.

udp:
![image](/uploads/5ea473ea6922c7882865835b1bf25d1a/image.png)
ttcp printed the report, but a large number of udp packets were lost.

## Steps to reproduce

1. build `zynqmp_qemu` BSP.
```shell
cd ~/RTEMS_devel/src/$rtems_src
./waf distclean
./waf configure --prefix=$HOME/RTEMS_devel/rtems/6 --rtems-config=$HOME/RTEMS_devel/config.ini
./waf
./waf install
```

2. build `rtems-lwip`
```shell
./waf configure --prefix=$HOME/RTEMS_devel/rtems/6 --rtems-bsps aarch64/zynqmp_qemu
./waf
./waf install
```

3. build `rtems-net-services`
```shell
./waf configure --prefix=$HOME/RTEMS_devel/rtems/6 --rtems-bsps aarch64/zynqmp_qemu
./waf
./waf install
```

4. run in qemu.
```shell
qemu-system-aarch64 -no-reboot -nographic -serial mon:stdio -machine xlnx-zcu102 -m 4096 -nic user,model=cadence_gem,id=u1,hostfwd=tcp::5001-:5001,hostfwd=udp::5001-:5001 -kernel $app
```

5. build ttcp on host.
```shell
cd src/rtems-net-services/ttcp
gcc ttcp.c
```

6. Enter the command line in qemu RTEMS shell.
```
ttcp -s -r
```
or
```
ttcp -s -r -u
```

7. Enter the command line in host shell.
```
cd src/rtems-net-services/ttcp
./a.out -s -t -u 127.0.0.1
```
or
```
./a.out -s -t 127.0.0.1
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/issues/3
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