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    Subject[PATCH v3 06/18] ibmvfc: add handlers to drain and complete Sub-CRQ responses
    Date
    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.

    Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
    ---
    drivers/scsi/ibmvscsi/ibmvfc.c | 80 ++++++++++++++++++++++++++++++++++
    1 file changed, 80 insertions(+)

    diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
    index e082935f56cf..b61ae1df21e5 100644
    --- a/drivers/scsi/ibmvscsi/ibmvfc.c
    +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
    @@ -3381,6 +3381,86 @@ static int ibmvfc_toggle_scrq_irq(struct ibmvfc_sub_queue *scrq, int enable)
    return rc;
    }

    +static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
    +{
    + struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
    + unsigned long flags;
    +
    + 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(&vhost->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;
    + }
    +
    + del_timer(&evt->timer);
    + list_del(&evt->queue);
    + ibmvfc_trc_end(evt);
    + spin_unlock_irqrestore(vhost->host->host_lock, flags);
    + evt->done(evt);
    + spin_lock_irqsave(vhost->host->host_lock, flags);
    +}
    +
    +static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_sub_queue *scrq)
    +{
    + struct ibmvfc_crq *crq;
    +
    + crq = &scrq->msgs[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_sub_queue *scrq)
    +{
    + struct ibmvfc_crq *crq;
    + unsigned long flags;
    + int done = 0;
    +
    + spin_lock_irqsave(scrq->vhost->host->host_lock, flags);
    + while (!done) {
    + while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
    + ibmvfc_handle_scrq(crq, scrq->vhost);
    + 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);
    + crq->valid = 0;
    + wmb();
    + } else
    + done = 1;
    + }
    + spin_unlock_irqrestore(scrq->vhost->host->host_lock, flags);
    +}
    +
    /**
    * ibmvfc_init_tgt - Set the next init job step for the target
    * @tgt: ibmvfc target struct
    --
    2.27.0
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