Sylvain Rochet 6a04357547 PPP, PPPoS, reworked output path, reduced serial tx pbuf buffers to 1
We actually allocated a pbuf chain only to iterate later the linked list
calling sio_write() for each pbuf, improved by calling sio_write() when
buffer is full and by recycling the pbuf, therefore only using one pbuf
for PPPoS output path.

Reworked pppos_write() and pppos_netif_output() to share more common
code into pppos_output_append() and pppos_output_last().
2015-03-14 00:37:58 +01:00
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