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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>
This commit is contained in:
Steve Wise 2014-04-24 14:32:04 -05:00 committed by Roland Dreier
parent 92e5011ab0
commit c2f9da92f2
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/cxgb4/qp.c
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@ -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);
}