s390/qeth: add TX IRQ coalescing support for IQD devices

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Since IQD devices complete (most of) their transmissions synchronously,
they don't offer TX completion IRQs and have no HW coalescing controls.
But we can fake the easy parts in SW, and give the user some control wrt
to how often the TX NAPI code should be triggered to process the TX
completions.

Having per-queue controls can in particular help the dedicated mcast
queue, as it likely benefits from different fine-tuning than what the
ucast queues need.

CC: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Julian Wiedmann 2020-03-25 10:35:04 +01:00 • committed by David S. Miller

parent 1ab2f8c699

commit ee1e52d1e4

3 changed files with 102 additions and 8 deletions

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15

drivers/s390/net/qeth_core.h

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20

drivers/s390/net/qeth_core_main.c

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75

drivers/s390/net/qeth_ethtool.c

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