[lwip-devel] [task #14369] Define ways to work with a netif having multiple ports

[Simon Goldschmidt]

Follow-up Comment #1, task #14369 (project lwip):

OK, here's my proposal:
- for RX, make pbuf->ref an u8_t (255 references should be enough) and add
'u8_t netif_idx;' that is set to the receiving netif's idx
- for TX, use netif_get_by_index(idx) with the pbufs index to transmit on a
specific port

For this, all port netifs would be added to the netif_list but kept 'down'
(link state wouldn't matter). And the actual bridge implementation would keep
all port netifs as sub-netifs so that:
- port netifs would call into the bridge for netif->input
- the bridge would select one or more ports on TX and call into their
netif->linkoutput

An RX would have to be PBUF_REF though when the bridge passes it into lwIP
*and* to a port at the same time (to prevent lwIP modifying it while
transmission on a port is underway).

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