anchao opened a new pull request, #7920:
URL: https://github.com/apache/nuttx/pull/7920
## Summary
mm/iob: revert "modify iob to support header padding and alignment features"
we don't need to implement l2 isolation through io_head, iob offload will
use io_offset
```
-------------------------------------------------------------
Layout of different NICs implementation:
iob_data (aligned by CONFIG_IOB_ALIGNMENT)
|
| io_offset(CONFIG_NET_LL_GUARDSIZE)
| |
-------------------------------------------------
Ethernet | Reserved | ETH_HDRLEN | io_len |
---------------------------------|---------------
8021Q | Reserved | ETH_8021Q_HDRLEN | io_len |
---------------------------------|---------------
ipforward | Reserved | io_len |
-------------------------------------------------
--------------------------------------------------------------------
```
Signed-off-by: chao an <[email protected]>
## Impact
N/A
## Testing
iperf test
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