net: systemport: Implement TX coalescing control knobs
Add the ability to configure both 'tx-frames' which controls how many frames are doing to trigger a single interrupt and 'tx-usecs' which dictates how long to wait before an interrupt should be services. Since our timer resolution is close to 8.192 us, we round up to the nearest value the 'tx-usecs' timeout value. Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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