[lwip-devel] [bug #47792] Cache neighbor_index per destination_cache entry

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?47792>

                 Summary: Cache neighbor_index per destination_cache entry
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Mi 27 Apr 2016 10:40:57 GMT
                Category: IPv6
                Severity: 2 - Minor
              Item Group: Feature Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

The current nd6 caching mechanism uses HWADDRHINT to cache destination index
per pcb, but the corresponding neighbor cache entry is cached globally.

This means when we have 2 concurrent connections, the cache-index does not
work often.

By adding a 'cached_neighbor_idx' to struct nd6_destination_cache_entry, this
could be improved (the u8_t of this cache would not even increase the struct's
size when hiding it between 'pmtu' and 'age').




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