IB/usnic: Support more QP state transitions

They were already implemented at a lower layer, but the upper level
routine placed arbitrary restrictions on which transitions were
permitted.  Simplify the state machine logic to live wholly in
usnic_ib_qp_grp_modify.

Signed-off-by: Dave Goodell <dgoodell@cisco.com>
Reviewed-by: Reese Faucette <rfaucett@cisco.com>
Reviewed-by: Xuyang Wang <xuywang@cisco.com>
Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
index 5ae6569..111afd5 100644 (file)
--- a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
+++ b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
@@ -571,20 +571,20 @@ int usnic_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 
        qp_grp = to_uqp_grp(ibqp);
 
-       /* TODO: Future Support All States */
        mutex_lock(&qp_grp->vf->pf->usdev_lock);
-       if ((attr_mask & IB_QP_STATE) && attr->qp_state == IB_QPS_INIT) {
-               status = usnic_ib_qp_grp_modify(qp_grp, IB_QPS_INIT, NULL);
-       } else if ((attr_mask & IB_QP_STATE) && attr->qp_state == IB_QPS_RTR) {
-               status = usnic_ib_qp_grp_modify(qp_grp, IB_QPS_RTR, NULL);
-       } else if ((attr_mask & IB_QP_STATE) && attr->qp_state == IB_QPS_RTS) {
-               status = usnic_ib_qp_grp_modify(qp_grp, IB_QPS_RTS, NULL);
+       if ((attr_mask & IB_QP_PORT) && attr->port_num != 1) {
+               /* usnic devices only have one port */
+               status = -EINVAL;
+               goto out_unlock;
+       }
+       if (attr_mask & IB_QP_STATE) {
+               status = usnic_ib_qp_grp_modify(qp_grp, attr->qp_state, NULL);
        } else {
-               usnic_err("Unexpected combination mask: %u state: %u\n",
-                               attr_mask & IB_QP_STATE, attr->qp_state);
+               usnic_err("Unhandled request, attr_mask=0x%x\n", attr_mask);
                status = -EINVAL;
        }
 
+out_unlock:
        mutex_unlock(&qp_grp->vf->pf->usdev_lock);
        return status;
 }