net/mlx4_core: Mask out host side virtualization features for guests

When VFs (guests in this context) issue the QUERY_DEV_CAP command, they
need not be told that host side virtualization features such as VST, FSM
(MAC anti-spoofing) and running > 80 VFs are supported by the device.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.c b/drivers/net/ethernet/mellanox/mlx4/fw.c
index 4251f81a0275..5089f76f060b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.c
@@ -973,6 +973,10 @@ out:
         return err;
 }
 
+#define DEV_CAP_EXT_2_FLAG_VLAN_CONTROL (1 << 26)
+#define DEV_CAP_EXT_2_FLAG_80_VFS       (1 << 21)
+#define DEV_CAP_EXT_2_FLAG_FSM          (1 << 20)
+
 int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
                                struct mlx4_vhcr *vhcr,
                                struct mlx4_cmd_mailbox *inbox,
@@ -982,7 +986,7 @@ int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
         u64     flags;
         int     err = 0;
         u8      field;
-        u32     bmme_flags;
+        u32     bmme_flags, field32;
         int     real_port;
         int     slave_port;
         int     first_port;
@@ -1053,6 +1057,12 @@ int mlx4_QUERY_DEV_CAP_wrapper(struct mlx4_dev *dev, int slave,
         field &= ~0x80;
         MLX4_PUT(outbox->buf, field, QUERY_DEV_CAP_FLOW_STEERING_IPOIB_OFFSET);
 
+        /* turn off host side virt features (VST, FSM, etc) for guests */
+        MLX4_GET(field32, outbox->buf, QUERY_DEV_CAP_EXT_2_FLAGS_OFFSET);
+        field32 &= ~(DEV_CAP_EXT_2_FLAG_VLAN_CONTROL | DEV_CAP_EXT_2_FLAG_80_VFS |
+                     DEV_CAP_EXT_2_FLAG_FSM);
+        MLX4_PUT(outbox->buf, field32, QUERY_DEV_CAP_EXT_2_FLAGS_OFFSET);
+
         return 0;
 }