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authorJulian Wiedmann <jwi@linux.ibm.com>2019-04-01 10:08:08 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-05-08 15:01:23 +0200
commit3060781f2664d34af641247aeac62696405a3fde (patch)
tree6dc9b7de3d10a5226862c867801b2aa58059a62f /arch/s390/Makefile
parents390/cio: Remove tracing for rchp instruction (diff)
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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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