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authorTyrel Datwyler <tyreld@linux.ibm.com>2021-01-14 14:31:36 -0600
committerMartin K. Petersen <martin.petersen@oracle.com>2021-01-14 22:27:44 -0500
commit1d956ad853fc70f611ea47cef1792385dc1de1b3 (patch)
tree08738f5d28105addf30a4ca0d7f63da79334d44c
parentd20046e64c099377f7e82583eb4ddf3a800fd19f (diff)
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>
-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 04efaa4e97b6..aba59a63318c 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -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