dpaa2-eth: Keep congestion group taildrop enabled when PFC on

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Leave congestion group taildrop enabled for all traffic classes
when PFC is enabled. Notification threshold is low enough such
that it will be hit first and this also ensures that FQs on
traffic classes which are not PFC enabled won't drain the buffer
pool.

FQ taildrop threshold is kept disabled as long as any form of
flow control is on. Since FQ taildrop works with bytes, not number
of frames, we can't guarantee it will not interfere with the
congestion notification mechanism for all frame sizes.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Ioana Ciornei 2020-05-31 00:08:14 +03:00 • committed by David S. Miller

parent f395b69f40

commit 07beb1651a

3 changed files with 34 additions and 10 deletions

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8

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth-dcb.c

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29

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

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7

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h

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