a0562881c5
Rx buffer and loads DMA map. Also add a function fxp_discard_rfabuf that handles reusing Rx buffer/DMA map. With this change fxp_add_rfabuf just handles appending a new RFA to existing chain. o Initialize mbuf length in fxp_new_rfabuf. o Don't reset rnr and have fxp(4) handle received frames even if it couldn't allocate new Rx buffer. This will make fxp(4) reload updated RFA under rnr case. The rnr would still be reset to 0 if polling is active and fxp(4) processed number of allowed Rx events. o Update if_iqdrops if fxp(4) couldn't allocate Rx buffer. Previously fxp(4) used to try to reuse Rx buffer when new buffer allocation is failed. But fxp(4) didn't take into account loaded DMA map such that the same DMA map was loaded again without unloading the map. There is no reason to unload the loaded map and reload the same map again, just reusing the map is enough. I believe the spare DMA map in softc was introduced to implement this behaviour. Also fxp(4) used to stop Rx processing if once Rx buffer allocation or DMA map load fails which in turn resulted in losing incoming frames under heavy network load. With this change fxp(4) should survive from resource shortage condition.
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