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scsi: ibmvfc: Add handlers to drain and complete Sub-CRQ responses 

The logic for iterating over the Sub-CRQ responses is similiar to that of
the primary CRQ. Add the necessary handlers for processing those responses.

Link: https://lore.kernel.org/r/20210114203148.246656-10-tyreld@linux.ibm.com
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tyrel Datwyler 2021-01-14 14:31:36 -06:00 committed by Martin K. Petersen
parent d20046e64c
commit 1d956ad853
1 changed files with 86 additions and 0 deletions
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86
drivers/scsi/ibmvscsi/ibmvfc.c
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@ -3485,6 +3485,92 @@ static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
return rc;
}
static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
struct list_head *evt_doneq)
{
struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
switch (crq->valid) {
case IBMVFC_CRQ_CMD_RSP:
break;
case IBMVFC_CRQ_XPORT_EVENT:
return;
default:
dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
return;
}
/* The only kind of payload CRQs we should get are responses to
* things we send. Make sure this response is to something we
* actually sent
*/
if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
crq->ioba);
return;
}
if (unlikely(atomic_read(&evt->free))) {
dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
crq->ioba);
return;
}
spin_lock(&evt->queue->l_lock);
list_move_tail(&evt->queue_list, evt_doneq);
spin_unlock(&evt->queue->l_lock);
}
static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
{
struct ibmvfc_crq *crq;
crq = &scrq->msgs.scrq[scrq->cur].crq;
if (crq->valid & 0x80) {
if (++scrq->cur == scrq->size)
scrq->cur = 0;
rmb();
} else
crq = NULL;
return crq;
}
static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
{
struct ibmvfc_crq *crq;
struct ibmvfc_event *evt, *temp;
unsigned long flags;
int done = 0;
LIST_HEAD(evt_doneq);
spin_lock_irqsave(scrq->q_lock, flags);
while (!done) {
while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
crq->valid = 0;
wmb();
}
ibmvfc_toggle_scrq_irq(scrq, 1);
if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
ibmvfc_toggle_scrq_irq(scrq, 0);
ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
crq->valid = 0;
wmb();
} else
done = 1;
}
spin_unlock_irqrestore(scrq->q_lock, flags);
list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
del_timer(&evt->timer);
list_del(&evt->queue_list);
ibmvfc_trc_end(evt);
evt->done(evt);
}
}
/**
* ibmvfc_init_tgt - Set the next init job step for the target
* @tgt: ibmvfc target struct