via-rhine: forbid holes in the receive descriptor ring.

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Rationales:
- throttle work under memory pressure
- lower receive descriptor recycling latency for the network adapter
- lower the maintenance burden of uncommon paths

The patch is twofold:
- it fails early if the receive ring can't be completely initialized
  at dev->open() time
- it drops packets on the floor in the napi receive handler so as to
  keep the received ring full

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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françois romieu 2015-05-01 22:14:41 +02:00 • committed by David S. Miller

parent 4d1fd9c1d8

commit 8709bb2c1e

1 changed files with 53 additions and 50 deletions

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103

drivers/net/ethernet/via/via-rhine.c

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