s390/qdio: enable drivers to poll for Output completions

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While commit d36deae750 ("qdio: extend API to allow polling") enhanced
the qdio layer so that drivers can poll their Input Queues, we don't
have the corresponding infrastructure for Output Queues yet.

Factor out a helper that scans a single QDIO Queue, so that qeth can
implement TX NAPI on top of it.
While doing so, remove the duplicated tracking of the next-to-scan index
(q->first_to_check vs q->first_to_kick) in this code path.

qdio_handle_aobs() needs to move slightly upwards in the code hierarchy,
so that it's still called from the polling path.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Julian Wiedmann 2019-08-23 11:48:47 +02:00 • committed by David S. Miller

parent fbbdbc6473

commit 7c47f5afde

2 changed files with 46 additions and 21 deletions

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3

arch/s390/include/asm/qdio.h

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64

drivers/s390/cio/qdio_main.c

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