Have you read this:
http://www.nongnu.org/lwip/2_0_x/pitfalls.html
I took a look at this. This has been provided by Xilinx drivers already.
In their MAC receive handler they allocate memory for pbuf (call to
pbuf_realloc() actually) and enqueue it. In the main loop, I call Xilinx
function xemacif_input() which check if there is anything in the queue
and if there is netif->input() is called as described in the example.
What I also noticed, when Zynq->PC side becomes active, in the TCP recv
callback I get p->tot_len much larger than 1446, and from time to time
there is also a print "Receive over run" from MAC error handler.
More I look at this, it seems as this is another problem in Xilinx drivers.
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