[PATCH] network mega patch

[Bean]

Hi,

This patch fixes some serious bugs and memory leaks in the network
stack. It also contains two optimization:

1, use default block size of 4096. block size is configurable via
tftp_block_size environment variable.
2, reuse netbuff in efinet driver when there is no data, this saves
some alloc/free loops.

-- 
Best wishes
Bean

net.txt
Description: Text document