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| author | Jan Glauber <jang@linux.vnet.ibm.com> | 2010-09-07 21:14:39 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-08 14:31:00 -0700 |
| commit | d36deae75011a7890f0e730dd0f867c64081cb50 (patch) | |
| tree | d24672cf5cc40c637186362187450362cabefd24 /drivers/s390/cio/qdio_setup.c | |
| parent | e508be174ad36b0cf9b324cd04978c2b13c21502 (diff) | |
| download | linux-stable-d36deae75011a7890f0e730dd0f867c64081cb50.tar.gz linux-stable-d36deae75011a7890f0e730dd0f867c64081cb50.tar.bz2 linux-stable-d36deae75011a7890f0e730dd0f867c64081cb50.zip | |
qdio: extend API to allow polling
Extend the qdio API to allow polling in the upper-layer driver. This
is needed by qeth to use NAPI.
To use the new interface the upper-layer driver must specify the
queue_start_poll(). This callback is used to signal the upper-layer
driver that is has initiative and must process the inbound queue by
calling qdio_get_next_buffers(). If the upper-layer driver wants to
stop polling it calls qdio_start_irq().
Since adapter interrupts are not completely stoppable qdio implements
a software bit QDIO_QUEUE_IRQS_DISABLED to safely disable interrupts for an
input queue.
The old interface is preserved and will be used as is by zfcp.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/cio/qdio_setup.c')
| -rw-r--r-- | drivers/s390/cio/qdio_setup.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c index 34c7e4046df4..a13cf7ec64b2 100644 --- a/drivers/s390/cio/qdio_setup.c +++ b/drivers/s390/cio/qdio_setup.c @@ -161,6 +161,7 @@ static void setup_queues(struct qdio_irq *irq_ptr, setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i); q->is_input_q = 1; + q->u.in.queue_start_poll = qdio_init->queue_start_poll; setup_storage_lists(q, irq_ptr, input_sbal_array, i); input_sbal_array += QDIO_MAX_BUFFERS_PER_Q; |