s390/qeth: simplify RX buffer tracking

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Since RX buffers may contain multiple packets, qeth's NAPI poll code can
exhaust its budget in the middle of an RX buffer. Thus we keep track of
our current position within the active RX buffer, so we can resume
processing here in the next NAPI poll period.

Clean up that code by tracking the index of the active buffer element,
instead of a pointer to it.
Also simplify the code that advances to the next RX buffer when the
current buffer has been fully processed.

v2: - remove QDIO_ELEMENT_NO() macro (davem)

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 10:34:57 +01:00 • committed by David S. Miller

parent 29f3490ba9

commit ed13615dd3

2 changed files with 13 additions and 19 deletions

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2

drivers/s390/net/qeth_core.h

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30

drivers/s390/net/qeth_core_main.c

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