RDMA/cxgb4: Only allow kernel db ringing for T4 devs

The whole db drop avoidance stuff is for T4 only.  So we cannot allow
that to be enabled for T5 devices.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index f18ef34e81845f5d60f42599eb131586a02b7369..086f62f5dc9e2ba5978e81f02e8e392c8e201774 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -1777,11 +1777,15 @@ int c4iw_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
        /*
         * Use SQ_PSN and RQ_PSN to pass in IDX_INC values for
         * ringing the queue db when we're in DB_FULL mode.
+        * Only allow this on T4 devices.
         */
        attrs.sq_db_inc = attr->sq_psn;
        attrs.rq_db_inc = attr->rq_psn;
        mask |= (attr_mask & IB_QP_SQ_PSN) ? C4IW_QP_ATTR_SQ_DB : 0;
        mask |= (attr_mask & IB_QP_RQ_PSN) ? C4IW_QP_ATTR_RQ_DB : 0;
+       if (is_t5(to_c4iw_qp(ibqp)->rhp->rdev.lldi.adapter_type) &&
+           (mask & (C4IW_QP_ATTR_SQ_DB|C4IW_QP_ATTR_RQ_DB)))
+               return -EINVAL;
 
        return c4iw_modify_qp(rhp, qhp, mask, &attrs, 0);
 }