On Mon, 2019-09-09 at 15:21 +0100, Robert Beckett wrote: > 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> > --- > > Notes: > Changes since v1: re-written to use ethtool priv flags instead of sysfs > attribute > > drivers/net/ethernet/intel/igb/igb.h | 1 + > drivers/net/ethernet/intel/igb/igb_ethtool.c | 8 ++++++++ > drivers/net/ethernet/intel/igb/igb_main.c | 11 +++++++++-- > 3 files changed, 18 insertions(+), 2 deletions(-)
Tested-by: Aaron Brown <aaron.f.br...@intel.com>
