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[S390] qdio: outbound tasklet scan threshold 

Introduce a scan treshold for the qdio outbound queues. By setting the
threshold the driver can tell qdio after how much used SBALs qdio
should schedule the outbound tasklet that scans the queue for finished
SBALs. The threshold is specific by the drivers because a
Hipersockets device is much faster in utilizing outbound buffers than a
ZFCP or OSA device.

The default values after how many used SBALs the tasklet should run are:

OSA:          > 31 SBALs
Hipersockets: > 7 SBALs
zfcp:         > 55 SBALs

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber 2011-01-05 12:47:50 +01:00 committed by Martin Schwidefsky
parent 4f325184f2
commit 3d6c76ff32
6 changed files with 15 additions and 1 deletions
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1
arch/s390/include/asm/qdio.h
View File

@ -361,6 +361,7 @@ struct qdio_initialize {
qdio_handler_t *input_handler;
qdio_handler_t *output_handler;
void (*queue_start_poll) (struct ccw_device *, int, unsigned long);
int scan_threshold;
unsigned long int_parm;
void **input_sbal_addr_array;
void **output_sbal_addr_array;

2
drivers/s390/cio/qdio.h
View File

@ -249,6 +249,8 @@ struct qdio_output_q {
int use_enh_siga;
/* timer to check for more outbound work */
struct timer_list timer;
/* used SBALs before tasklet schedule */
int scan_threshold;
};
/*

8
drivers/s390/cio/qdio_main.c
View File

@ -1492,7 +1492,13 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
qperf_inc(q, fast_requeue);
out:
tasklet_schedule(&q->tasklet);
/* in case of SIGA errors we must process the error immediately */
if (used >= q->u.out.scan_threshold || rc)
tasklet_schedule(&q->tasklet);
else
/* free the SBALs in case of no further traffic */
if (!timer_pending(&q->u.out.timer))
mod_timer(&q->u.out.timer, jiffies + HZ);
return rc;
}

1
drivers/s390/cio/qdio_setup.c
View File

@ -178,6 +178,7 @@ static void setup_queues(struct qdio_irq *irq_ptr,
setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
q->is_input_q = 0;
q->u.out.scan_threshold = qdio_init->scan_threshold;
setup_storage_lists(q, irq_ptr, output_sbal_array, i);
output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;

2
drivers/s390/net/qeth_core_main.c
View File

@ -3831,6 +3831,8 @@ static int qeth_qdio_establish(struct qeth_card *card)
init_data.int_parm = (unsigned long) card;
init_data.input_sbal_addr_array = (void **) in_sbal_ptrs;
init_data.output_sbal_addr_array = (void **) out_sbal_ptrs;
init_data.scan_threshold =
(card->info.type == QETH_CARD_TYPE_IQD) ? 8 : 32;
if (atomic_cmpxchg(&card->qdio.state, QETH_QDIO_ALLOCATED,
QETH_QDIO_ESTABLISHED) == QETH_QDIO_ALLOCATED) {

2
drivers/s390/scsi/zfcp_qdio.c
View File

@ -292,6 +292,8 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
id->int_parm = (unsigned long) qdio;
id->input_sbal_addr_array = (void **) (qdio->res_q);
id->output_sbal_addr_array = (void **) (qdio->req_q);
id->scan_threshold =
QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2;
}
/**