anchao opened a new pull request, #7890:
URL: https://github.com/apache/nuttx/pull/7890
## Summary
1. 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 |
-------------------------------------------------
--------------------------------------------------------------------
```
2. mm/iob: decoupling iob_s and io_data
3. mm/iob: add support of shared iob
add reference count to each iob entry to support shared iob, multiple iob
entries could share the io_data to avoid unnecessary iob_alloc and memory
copies
```
--------- ---------
Shared entries | iob_s | | iob_s |
--------- ---------
\ /
(io_parent) \ / (io_parent)
\ /
--------------------------------------------------
Origin entry | iob_s | io_data (shared with shadow entries) |
--------------------------------------------------
io_refs(3)
```
4. net/devif/iobsend: add support of iob shared to avoid unnecessary iob
copying
Iperf passthrough on NuttX simulator:
enable CONFIG_NET_TCP_WRITE_BUFFERS,
```
----------------------------------------
| Protocol | Client | |
|--------------------------------------|
| TCP | 230 | Mbits/sec |
| TCP(Shared) | 300 | Mbits/sec |
----------------------------------------
```
5. net/tcp: update only if packet and device length are different
## Impact
N/A
## Testing
iperf test
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