mlx4_core: Add link type autosensing

When a port's link is down (except to driver restart) and the port is
configured for auto sensing, we try to sense port link type (Ethernet
or InfiniBand) in order to determine how to initialize the port.  If
the port type needs to be changed, all mlx4 for the device interfaces
are unregistered and then registered again with the new port
types.  Sensing is done with intervals of 3 seconds.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/mlx4/cmd.h b/include/linux/mlx4/cmd.h
index cf9c679ab38b..0f82293a82ed 100644
--- a/include/linux/mlx4/cmd.h
+++ b/include/linux/mlx4/cmd.h
@@ -55,6 +55,7 @@ enum {
         MLX4_CMD_CLOSE_PORT      = 0xa,
         MLX4_CMD_QUERY_HCA       = 0xb,
         MLX4_CMD_QUERY_PORT      = 0x43,
+        MLX4_CMD_SENSE_PORT      = 0x4d,
         MLX4_CMD_SET_PORT        = 0xc,
         MLX4_CMD_ACCESS_DDR      = 0x2e,
         MLX4_CMD_MAP_ICM         = 0xffa,
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 8f659cc29960..3aff8a6a389e 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -155,8 +155,9 @@ enum mlx4_qp_region {
 };
 
 enum mlx4_port_type {
-        MLX4_PORT_TYPE_IB       = 1 << 0,
-        MLX4_PORT_TYPE_ETH      = 1 << 1,
+        MLX4_PORT_TYPE_IB       = 1,
+        MLX4_PORT_TYPE_ETH      = 2,
+        MLX4_PORT_TYPE_AUTO     = 3
 };
 
 enum mlx4_special_vlan_idx {
@@ -237,6 +238,7 @@ struct mlx4_caps {
         enum mlx4_port_type     port_type[MLX4_MAX_PORTS + 1];
         u8                      supported_type[MLX4_MAX_PORTS + 1];
         u32                     port_mask;
+        enum mlx4_port_type     possible_type[MLX4_MAX_PORTS + 1];
 };
 
 struct mlx4_buf_list {