IB/mlx4: Add iov directory in sysfs under the ib device

This directory is added only for the master -- slaves do not have it.

The sysfs iov directory is used to manage and examine the port P_Key
and guid paravirtualization.

Under iov/ports, the administrator may examine the gid and P_Key tables
as they are present in the device (and as are seen in the "network
view" presented to the SM).

Under the iov/<pci slot number> directories, the admin may map the
index numbers in the physical tables (as under iov/ports) to the
paravirtualized index numbers that guests see.

For example, if the administrator, for port 1 on guest 2 maps physical
pkey index 10 to virtual index 1, then that guest, whenever it uses
its pkey index 1, will actually be using the real pkey index 10.

Based on patch from Erez Shitrit <erezsh@mellanox.com>

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index 591c2891159b..b689dbd6d8f6 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -1963,6 +1963,11 @@ int mlx4_ib_init_sriov(struct mlx4_ib_dev *dev)
 		mlx4_ib_warn(&dev->ib_dev, "Failed init alias guid process.\n");
 		goto paravirt_err;
 	}
+	err = mlx4_ib_device_register_sysfs(dev);
+	if (err) {
+		mlx4_ib_warn(&dev->ib_dev, "Failed to register sysfs\n");
+		goto sysfs_err;
+	}
 
 	mlx4_ib_warn(&dev->ib_dev, "initializing demux service for %d qp1 clients\n",
 		     dev->dev->caps.sqp_demux);
@@ -1989,6 +1994,9 @@ demux_err:
 		mlx4_ib_free_demux_ctx(&dev->sriov.demux[i]);
 		--i;
 	}
+	mlx4_ib_device_unregister_sysfs(dev);
+
+sysfs_err:
 	mlx4_ib_destroy_alias_guid_service(dev);
 
 paravirt_err:
@@ -2019,5 +2027,6 @@ void mlx4_ib_close_sriov(struct mlx4_ib_dev *dev)
 
 		mlx4_ib_cm_paravirt_clean(dev, -1);
 		mlx4_ib_destroy_alias_guid_service(dev);
+		mlx4_ib_device_unregister_sysfs(dev);
 	}
 }