ixgbe: Add work around for empty SFP+ cage crosstalk

It is possible on some systems that crosstalk could lead to link flap
on empty SFP+ cages.  A new NVM bit was defined to let SW know it
needs to implement the work around which consists of verifying that
there is a module in the cage before acting on the LSC.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 94e39c1..22cf2a9 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -803,6 +803,8 @@ struct ixgbe_adapter {
 
 #define IXGBE_RSS_KEY_SIZE     40  /* size of RSS Hash Key in bytes */
        u32 rss_key[IXGBE_RSS_KEY_SIZE / sizeof(u32)];
+
+       bool need_crosstalk_fix;
 };
 
 static inline u8 ixgbe_max_rss_indices(struct ixgbe_adapter *adapter)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 517f06e..09d7c8b 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -5572,6 +5572,7 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
        struct pci_dev *pdev = adapter->pdev;
        unsigned int rss, fdir;
        u32 fwsm;
+       u16 device_caps;
 #ifdef CONFIG_IXGBE_DCB
        int j;
        struct tc_configuration *tc;
@@ -5737,6 +5738,22 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter)
        adapter->tx_ring_count = IXGBE_DEFAULT_TXD;
        adapter->rx_ring_count = IXGBE_DEFAULT_RXD;
 
+       /* Cache bit indicating need for crosstalk fix */
+       switch (hw->mac.type) {
+       case ixgbe_mac_82599EB:
+       case ixgbe_mac_X550EM_x:
+       case ixgbe_mac_x550em_a:
+               hw->mac.ops.get_device_caps(hw, &device_caps);
+               if (device_caps & IXGBE_DEVICE_CAPS_NO_CROSSTALK_WR)
+                       adapter->need_crosstalk_fix = false;
+               else
+                       adapter->need_crosstalk_fix = true;
+               break;
+       default:
+               adapter->need_crosstalk_fix = false;
+               break;
+       }
+
        /* set default work limits */
        adapter->tx_work_limit = IXGBE_DEFAULT_TX_WORK;
 
@@ -6659,6 +6676,18 @@ static void ixgbe_watchdog_update_link(struct ixgbe_adapter *adapter)
                link_up = true;
        }
 
+       /* If Crosstalk fix enabled do the sanity check of making sure
+        * the SFP+ cage is empty.
+        */
+       if (adapter->need_crosstalk_fix) {
+               u32 sfp_cage_full;
+
+               sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
+                               IXGBE_ESDP_SDP2;
+               if (ixgbe_is_sfp(hw) && link_up && !sfp_cage_full)
+                       link_up = false;
+       }
+
        if (adapter->ixgbe_ieee_pfc)
                pfc_en |= !!(adapter->ixgbe_ieee_pfc->pfc_en);
 
@@ -7005,6 +7034,16 @@ static void ixgbe_sfp_detection_subtask(struct ixgbe_adapter *adapter)
        struct ixgbe_hw *hw = &adapter->hw;
        s32 err;
 
+       /* If crosstalk fix enabled verify the SFP+ cage is full */
+       if (adapter->need_crosstalk_fix) {
+               u32 sfp_cage_full;
+
+               sfp_cage_full = IXGBE_READ_REG(hw, IXGBE_ESDP) &
+                               IXGBE_ESDP_SDP2;
+               if (!sfp_cage_full)
+                       return;
+       }
+
        /* not searching for SFP so there is nothing to do here */
        if (!(adapter->flags2 & IXGBE_FLAG2_SEARCH_FOR_SFP) &&
            !(adapter->flags2 & IXGBE_FLAG2_SFP_NEEDS_RESET))

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 29a1c42..8e7decb 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -2124,6 +2124,7 @@ enum {
 #define IXGBE_SAN_MAC_ADDR_PORT1_OFFSET  0x3
 #define IXGBE_DEVICE_CAPS_ALLOW_ANY_SFP  0x1
 #define IXGBE_DEVICE_CAPS_FCOE_OFFLOADS  0x2
+#define IXGBE_DEVICE_CAPS_NO_CROSSTALK_WR      BIT(7)
 #define IXGBE_FW_LESM_PARAMETERS_PTR     0x2
 #define IXGBE_FW_LESM_STATE_1            0x1
 #define IXGBE_FW_LESM_STATE_ENABLED      0x8000 /* LESM Enable bit */