[PATCH] IB/core: Perform modify QP on real one

[Leon Romanovsky <leon@kernel.org>]

From: Parav Pandit <parav@mellanox.com>

commit b2bedfb39541a7e14798d066b6f8685d84c8fcf5 upstream

Currently qp->port stores the port number whenever IB_QP_PORT
QP attribute mask is set (during QP state transition to INIT state).
This port number should be stored for the real QP when XRC target QP
is used.

Follow the ib_modify_qp() implementation and hide the access to ->real_qp.

This commit is required for proper operation of commit 65be9cbe1224
("RDMA/uverbs: Expand primary and alt AV port checks") which was added
to 4.14.61.

Without this commit, XRC qp's do not work.

Fixes: a512c2fbef9c ("IB/core: Introduce modify QP operation with udata")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
 drivers/infiniband/core/verbs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index feb80db..6d59af0 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1285,7 +1285,7 @@ int ib_resolve_eth_dmac(struct ib_device *device,

 /**
  * ib_modify_qp_with_udata - Modifies the attributes for the specified QP.
- * @qp: The QP to modify.
+ * @ib_qp: The QP to modify.
  * @attr: On input, specifies the QP attributes to modify. On output,
  *   the current values of selected QP attributes are returned.
  * @attr_mask: A bit-mask used to specify which attributes of the QP
@@ -1294,9 +1294,10 @@ int ib_resolve_eth_dmac(struct ib_device *device,
  *   are being modified.
  * It returns 0 on success and returns appropriate error code on error.
  */
-int ib_modify_qp_with_udata(struct ib_qp *qp, struct ib_qp_attr *attr,
+int ib_modify_qp_with_udata(struct ib_qp *ib_qp, struct ib_qp_attr *attr,
 			    int attr_mask, struct ib_udata *udata)
 {
+	struct ib_qp *qp = ib_qp->real_qp;
 	int ret;

 	if (attr_mask & IB_QP_AV) {