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RDMA/cma: Do not query GID during QP state transition to RTR

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[ Upstream commit 9aa169213d1166d30ae357a44abbeae93459339d ]

When commit [1] was added, SGID was queried to derive the SMAC address.
Then, later on during a refactor [2], SMAC was no longer needed. However,
the now useless GID query remained.  Then during additional code changes
later on, the GID query was being done in such a way that it caused iWARP
queries to start breaking.  Remove the useless GID query and resolve the
iWARP breakage at the same time.

This is discussed in [3].

[1] commit dd5f03beb4f7 ("IB/core: Ethernet L2 attributes in verbs/cm structures")
[2] commit 5c266b2304fb ("IB/cm: Remove the usage of smac and vid of qp_attr and cm_av")
[3] https://www.spinics.net/lists/linux-rdma/msg63951.html

Suggested-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Parav Pandit 2018-05-02 13:18:59 +03:00 committed by Greg Kroah-Hartman
parent 3c54e919bd
commit 373a625cb3
1 changed files with 0 additions and 7 deletions
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7
drivers/infiniband/core/cma.c
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@ -900,7 +900,6 @@ static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
{
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
union ib_gid sgid;
mutex_lock(&id_priv->qp_mutex);
if (!id_priv->id.qp) {
@ -923,12 +922,6 @@ static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
if (ret)
goto out;
ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
rdma_ah_read_grh(&qp_attr.ah_attr)->sgid_index,
&sgid, NULL);
if (ret)
goto out;
BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
if (conn_param)