Commit 1d956ad8 authored by Tyrel Datwyler's avatar Tyrel Datwyler Committed by Martin K. Petersen
Browse files

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: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarTyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent d20046e6

drivers/scsi/ibmvscsi/ibmvfc.c

+86 −0
Original line number Diff line number Diff line
@@ -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