[PATCH V2 for-next 14/19] IB/hns: Validate mtu when modified qp

[Salil Mehta]

From: Lijun Ou <ouli...@huawei.com>

The mtu should be validated when modify qp,so we check it.

Signed-off-by: Lijun Ou <ouli...@huawei.com>
Signed-off-by: Peter Chen <luck.c...@huawei.com>
Reviewed-by:  Wei Hu (Xavier) <xavier.hu...@huawei.com>
Signed-off-by: Salil Mehta <salil.me...@huawei.com>
---
PATCH V2: Addressed Leon Romanovsky's comments
          Link: https://lkml.org/lkml/2016/9/13/39
PATCH V1: Initial Submit
---
 drivers/infiniband/hw/hns/hns_roce_qp.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c 
b/drivers/infiniband/hw/hns/hns_roce_qp.c
index dd1b214..6a38909 100644
--- a/drivers/infiniband/hw/hns/hns_roce_qp.c
+++ b/drivers/infiniband/hw/hns/hns_roce_qp.c
@@ -32,6 +32,7 @@
  */
 
 #include <linux/platform_device.h>
+#include <rdma/ib_addr.h>
 #include <rdma/ib_umem.h>
 #include "hns_roce_common.h"
 #include "hns_roce_device.h"
@@ -657,6 +658,7 @@ int hns_roce_modify_qp(struct ib_qp *ibqp, struct 
ib_qp_attr *attr,
        struct device *dev = &hr_dev->pdev->dev;
        int ret = -EINVAL;
        int p;
+       enum ib_mtu active_mtu;
 
        mutex_lock(&hr_qp->mutex);
 
@@ -687,6 +689,19 @@ int hns_roce_modify_qp(struct ib_qp *ibqp, struct 
ib_qp_attr *attr,
                }
        }
 
+       if (attr_mask & IB_QP_PATH_MTU) {
+               p = attr_mask & IB_QP_PORT ? (attr->port_num - 1) : hr_qp->port;
+               active_mtu = iboe_get_mtu(hr_dev->iboe.netdevs[p]->mtu);
+
+               if (attr->path_mtu > IB_MTU_2048 ||
+                   attr->path_mtu < IB_MTU_256 ||
+                   attr->path_mtu > active_mtu) {
+                       dev_err(dev, "attr path_mtu(%d)invalid while modify qp",
+                               attr->path_mtu);
+                       goto out;
+               }
+       }
+
        if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
            attr->max_rd_atomic > hr_dev->caps.max_qp_init_rdma) {
                dev_err(dev, "attr max_rd_atomic 
invalid.attr->max_rd_atomic=%d\n",
-- 
1.9.1