mlx4: Paravirtualize Node Guids for slaves

This is necessary in order to support > 1 VF/PF in a VM for software
that uses the node guid as a discriminator, such as librdmacm.

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

3 files changed, 34 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
index 78fdbd653fa9..90774b7e47a4 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
@@ -696,6 +696,7 @@ static int mlx4_MAD_IFC_wrapper(struct mlx4_dev *dev, int slave,
         struct ib_smp *outsmp = outbox->buf;
         __be16 *outtab = (__be16 *)(outsmp->data);
         __be32 slave_cap_mask;
+        __be64 slave_node_guid;
         port = vhcr->in_modifier;
 
         if (smp->base_version == 1 &&
@@ -755,6 +756,16 @@ static int mlx4_MAD_IFC_wrapper(struct mlx4_dev *dev, int slave,
                                 }
                                 return err;
                         }
+                        if (smp->attr_id == IB_SMP_ATTR_NODE_INFO) {
+                                err = mlx4_cmd_box(dev, inbox->dma, outbox->dma,
+                                             vhcr->in_modifier, vhcr->op_modifier,
+                                             vhcr->op, MLX4_CMD_TIME_CLASS_C, MLX4_CMD_NATIVE);
+                                if (!err) {
+                                        slave_node_guid =  mlx4_get_slave_node_guid(dev, slave);
+                                        memcpy(outsmp->data + 12, &slave_node_guid, 8);
+                                }
+                                return err;
+                        }
                 }
         }
         if (slave != mlx4_master_func_num(dev) &&
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 2294b7173180..76f69fdd01d5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -435,6 +435,28 @@ void mlx4_sync_pkey_table(struct mlx4_dev *dev, int slave, int port, int i, int
 }
 EXPORT_SYMBOL(mlx4_sync_pkey_table);
 
+void mlx4_put_slave_node_guid(struct mlx4_dev *dev, int slave, __be64 guid)
+{
+        struct mlx4_priv *priv = container_of(dev, struct mlx4_priv, dev);
+
+        if (!mlx4_is_master(dev))
+                return;
+
+        priv->slave_node_guids[slave] = guid;
+}
+EXPORT_SYMBOL(mlx4_put_slave_node_guid);
+
+__be64 mlx4_get_slave_node_guid(struct mlx4_dev *dev, int slave)
+{
+        struct mlx4_priv *priv = container_of(dev, struct mlx4_priv, dev);
+
+        if (!mlx4_is_master(dev))
+                return 0;
+
+        return priv->slave_node_guids[slave];
+}
+EXPORT_SYMBOL(mlx4_get_slave_node_guid);
+
 int mlx4_is_slave_active(struct mlx4_dev *dev, int slave)
 {
         struct mlx4_priv *priv = mlx4_priv(dev);
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
index 399793a23457..4b1fbd84a68f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
@@ -810,6 +810,7 @@ struct mlx4_priv {
         int                     reserved_mtts;
         int                     fs_hash_mode;
         u8 virt2phys_pkey[MLX4_MFUNC_MAX][MLX4_MAX_PORTS][MLX4_MAX_PORT_PKEYS];
+        __be64                  slave_node_guids[MLX4_MFUNC_MAX];
 
 };