diff mbox

[RESEND,3.15-rc3,3/3] iw_cxgb4: only allow kernel db ringing for T4 devs

Message ID 20140424193204.27837.44736.stgit@build.ogc.int (mailing list archive)
State Accepted, archived
Headers show

Commit Message

Steve Wise April 24, 2014, 7:32 p.m. UTC 
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>
---

 drivers/infiniband/hw/cxgb4/qp.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


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diff mbox

Patch

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index f18ef34..086f62f 100644
--- 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);
 }