mm/iob: add support of shared iob #7890
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…atures"
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]>
Signed-off-by: chao an <[email protected]>
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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)
Signed-off-by: chao an <[email protected]>
… copying Iperf passthrough on NuttX simulator: enable CONFIG_NET_TCP_WRITE_BUFFERS, ---------------------------------------- | Protocol | Client | | |--------------------------------------| | TCP | 230 | Mbits/sec | | TCP(Shared) | 300 | Mbits/sec | ---------------------------------------- Signed-off-by: chao an <[email protected]>
Signed-off-by: chao an <[email protected]>
acassis
approved these changes
Dec 18, 2022
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Summary
we don't need to implement l2 isolation through io_head, iob offload will use io_offset
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
Iperf passthrough on NuttX simulator:
enable CONFIG_NET_TCP_WRITE_BUFFERS,
Impact
N/A
Testing
iperf test