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s390/qdio: allow to scan all Output SBALs in one go
Old code restricted the number of inspected SBALs to QDIO_MAX_BUFFERS_PER_Q - 1, as otherwise the first_to_check and first_to_kick cursors could overlap. Subsequent code would then assume that there was no progress on the queue, when in fact _all_ SBALs on the queue were ready-to-process. This limitation no longer applies, so allow the queue-scan code to inspect all SBALs on the queue. Note that qeth requires an additional patch ("s390/qeth: stop/wake TX queues based on their fill level"), to avoid potential queue stalls when all 128 SBALs are reported as ready-to-process. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 changed files with 1 additions and 5 deletions
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@ -719,11 +719,7 @@ static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
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multicast_outbound(q)))
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qdio_siga_sync_q(q);
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/*
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* Don't check 128 buffers, as otherwise qdio_inbound_q_moved
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* would return 0.
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*/
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count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
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count = atomic_read(&q->nr_buf_used);
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if (!count)
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return 0;
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