e1000e: Serdes - attempt autoneg when link restored.

This patch addresses an issue where we did not restart auto-negotiation on
serdes links when the link partner was disabled and re-enabled. It includes
reworking the serdes link detect mechanism to be a state machine for
82571 and 82572 parts only.

Signed-off-by: dave graham <david.graham@intel.com>
Acked-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h
index 2d4ce0492df0..5cb428c2811d 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -459,6 +459,13 @@ enum e1000_smart_speed {
         e1000_smart_speed_off
 };
 
+enum e1000_serdes_link_state {
+        e1000_serdes_link_down = 0,
+        e1000_serdes_link_autoneg_progress,
+        e1000_serdes_link_autoneg_complete,
+        e1000_serdes_link_forced_up
+};
+
 /* Receive Descriptor */
 struct e1000_rx_desc {
         __le64 buffer_addr; /* Address of the descriptor's data buffer */
@@ -787,6 +794,7 @@ struct e1000_mac_info {
         bool in_ifs_mode;
         bool serdes_has_link;
         bool tx_pkt_filtering;
+        enum e1000_serdes_link_state serdes_link_state;
 };
 
 struct e1000_phy_info {