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cxgbe(4): Add a new knob that controls the congestion response of netmap

Description

cxgbe(4): Add a new knob that controls the congestion response of netmap
rx queues. The default is to drop rather than backpressure.

This decouples the congestion settings of NIC and netmap rx queues.

MFC after: 3 days

Details

Provenance
npAuthored on
Parents
rS285220: cxgbe(4): Do not override the the global defaults for congestion drops.
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