On Wed, 16 Oct 2019 16:47:06 -0700, Jeff Kirsher wrote: > From: Robert Beckett <bob.beck...@collabora.com> > > To allow userland to enable or disable dropping packets when descriptor > ring is exhausted, add RX_DROP_EN private flag. > > This can be used in conjunction with flow control to mitigate packet storms > (e.g. due to network loop or DoS) by forcing the network adapter to send > pause frames whenever the ring is close to exhaustion. > > By default this will maintain previous behaviour of enabling dropping of > packets during ring buffer exhaustion. > Some use cases prefer to not drop packets upon exhaustion, but instead > use flow control to limit ingress rates and ensure no dropped packets. > This is useful when the host CPU cannot keep up with packet delivery, > but data delivery is more important than throughput via multiple queues. > > Userland can set this flag to 0 via ethtool to disable packet dropping. > > Signed-off-by: Robert Beckett <bob.beck...@collabora.com> > Tested-by: Aaron Brown <aaron.f.br...@intel.com> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
How is this different than enabling/disabling flow control.. ethtool -a/-A
