linux-kernel - [PATCH 1/5 try2] ib/ehca: update qp_state on cached modify

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Message-Id: <200808121546.07212.alexs@linux.vnet.ibm.com>
Date:	Tue, 12 Aug 2008 15:46:07 +0200
From:	Alexander Schmidt <alexs@...ux.vnet.ibm.com>
To:	Roland Dreier <rolandd@...co.com>,
	"of-ewg" <ewg@...ts.openfabrics.org>,
	"of-general" <general@...ts.openfabrics.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"linuxppc-dev" <linuxppc-dev@...abs.org>
Cc:	Stefan Roscher <stefan.roscher@...ibm.com>,
	"Hoang-Nam Nguyen" <hnguyen@...ibm.com>,
	Joachim Fenkes <fenkes@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>
Subject: [PATCH 1/5 try2] ib/ehca: update qp_state on cached modify_qp()

Since the introduction of the port auto-detect mode for ehca, calls to
modify_qp() may be cached in the device driver when the ports are not
activated yet. When a modify_qp() call is cached, the qp state remains
untouched until the port is activated, which will leave the qp in the reset
state. In the reset state, however, it is not allowed to post SQ WQEs,
which confuses applications like ib_mad.

The solution for this problem is to immediately set the qp state as requested
by modify_qp(), even when the call is cached.


Signed-off-by: Alexander Schmidt <alexs@...ux.vnet.ibm.com>
---
 drivers/infiniband/hw/ehca/ehca_qp.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--- infiniband.git.orig/drivers/infiniband/hw/ehca/ehca_qp.c
+++ infiniband.git/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -1534,8 +1534,6 @@ static int internal_modify_qp(struct ib_
 	if (attr_mask & IB_QP_QKEY)
 		my_qp->qkey = attr->qkey;
 
-	my_qp->state = qp_new_state;
-
 modify_qp_exit2:
 	if (squeue_locked) { /* this means: sqe -> rts */
 		spin_unlock_irqrestore(&my_qp->spinlock_s, flags);
@@ -1551,6 +1549,8 @@ modify_qp_exit1:
 int ehca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask,
 		   struct ib_udata *udata)
 {
+	int ret = 0;
+
 	struct ehca_shca *shca = container_of(ibqp->device, struct ehca_shca,
 					      ib_device);
 	struct ehca_qp *my_qp = container_of(ibqp, struct ehca_qp, ib_qp);
@@ -1597,12 +1597,18 @@ int ehca_modify_qp(struct ib_qp *ibqp, s
 				 attr->qp_state, my_qp->init_attr.port_num,
 				 ibqp->qp_type);
 			spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
-			return 0;
+			goto out;
 		}
 		spin_unlock_irqrestore(&sport->mod_sqp_lock, flags);
 	}
 
-	return internal_modify_qp(ibqp, attr, attr_mask, 0);
+	ret = internal_modify_qp(ibqp, attr, attr_mask, 0);
+
+out:
+	if ((ret == 0) && (attr_mask & IB_QP_STATE))
+		my_qp->state = attr->qp_state;
+
+	return ret;
 }
 
 void ehca_recover_sqp(struct ib_qp *sqp)
--
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