s390/qeth: also use TX NAPI for non-IQD devices

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Set scan_threshold = 0 to opt out from the qdio layer's internal tasklet
& timer mechanism for TX completions, and replace it with the TX NAPI
infrastructure that qeth already uses for IQD devices. This avoids the
fragile logic in qdio_check_output_queue(), enables tighter integration
and gives us more tuning options via ethtool in the future.

For now we continue to apply the same policy as the qdio layer:
scan for completions if 32 TX buffers are in use, or after 1 sec.
A re-scan is done after 10 sec, but only if no TX interrupt is pending.

With scan_threshold = 0 we no longer get TX completion scans from
within qdio_get_next_buffers(). So trigger these manually in qeth_poll()
and in the RX path switch to the equivalent qdio_inspect_queue().

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

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This commit is contained in:

Julian Wiedmann 2021-06-11 09:33:34 +02:00 • committed by David S. Miller

parent e872d0c124

commit 7a4b92e8e0

2 changed files with 79 additions and 75 deletions

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6

drivers/s390/net/qeth_core.h

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148

drivers/s390/net/qeth_core_main.c

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