patrickelectric opened a new pull request, #18922:
URL: https://github.com/apache/nuttx/pull/18922
## Summary
The Ethernet MAC (57.11.4) was already configured in the code, but it was
necessary to configure the Transmit Descriptor (57.10.3) in read format:
- Checksum Interface Control for IP, payload and pseudo-header
Add checks for Receive Descriptor (57.10.4) in read format:
- Receive Descriptor 1 is valid from Receive Descriptor 3
- IP checksum was not bypassed
- IP header checksum error op IP payload checksum error is set
## Impact
Avoid unnecessary checksums done in software
## Testing
Testing with STM32 Nucleo-144 using iperf, improved transmission from
35 MBits/s to 50MBits/s.
### With CONFIG_STM32H5_ETH_HWCHECKSUM
```
nsh> iperf -c 192.168.2.2 -t 2 -i 1
IP: 192.168.2.90
mode=tcp-client sip=192.168.2.90:5001,dip=192.168.2.2:5001, interval=1,
time=2
Interval Transfer Bandwidth
0.00- 1.00 sec 6291456 Bytes 50.23 Mbits/sec
1.00- 2.00 sec 6307840 Bytes 50.36 Mbits/sec
0.00- 2.00 sec 12599296 Bytes 50.30 Mbits/sec
iperf exit
nsh> xd 0x40028000 4
Hex dump:
0000: 03 e1 00 08
```
### Without CONFIG_STM32H5_ETH_HWCHECKSUM
```
nsh> iperf -c 192.168.2.2 -t 2 -i 1
IP: 192.168.2.90
mode=tcp-client sip=192.168.2.90:5001,dip=192.168.2.2:5001, interval=1,
time=2
Interval Transfer Bandwidth
0.00- 1.00 sec 4358144 Bytes 34.80 Mbits/sec
1.00- 2.00 sec 4374528 Bytes 34.89 Mbits/sec
0.00- 2.00 sec 8732672 Bytes 34.84 Mbits/sec
iperf exit
nsh> xd 0x40028000 4
Hex dump:
0000: 03 e1 00 00
```
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