ixgbe: cache AUTOC reads

This patch removes majority of the AUTOC register reads by using a cached
value instead.

The reason for this change is to avoid writing corrupted values to AUTOC
due to bad FW.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
index 3f79242..c4c5e87 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
@@ -167,9 +167,9 @@ static s32 ixgbe_setup_sfp_modules_82599(struct ixgbe_hw *hw)
                }
 
                /* Restart DSP and set SFI mode */
-               IXGBE_WRITE_REG(hw, IXGBE_AUTOC, (IXGBE_READ_REG(hw,
-                               IXGBE_AUTOC) | IXGBE_AUTOC_LMS_10G_SERIAL));
-
+               IXGBE_WRITE_REG(hw, IXGBE_AUTOC, ((hw->mac.orig_autoc) |
+                               IXGBE_AUTOC_LMS_10G_SERIAL));
+               hw->mac.cached_autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);
                ret_val = ixgbe_reset_pipeline_82599(hw);
 
                if (got_lock) {
@@ -803,12 +803,9 @@ static s32 ixgbe_setup_mac_link_82599(struct ixgbe_hw *hw,
                                      bool autoneg_wait_to_complete)
 {
        s32 status = 0;
-       u32 autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+       u32 autoc, pma_pmd_1g, link_mode, start_autoc;
        u32 autoc2 = IXGBE_READ_REG(hw, IXGBE_AUTOC2);
-       u32 start_autoc = autoc;
        u32 orig_autoc = 0;
-       u32 link_mode = autoc & IXGBE_AUTOC_LMS_MASK;
-       u32 pma_pmd_1g = autoc & IXGBE_AUTOC_1G_PMA_PMD_MASK;
        u32 pma_pmd_10g_serial = autoc2 & IXGBE_AUTOC2_10G_SERIAL_PMA_PMD_MASK;
        u32 links_reg;
        u32 i;
@@ -831,9 +828,14 @@ static s32 ixgbe_setup_mac_link_82599(struct ixgbe_hw *hw,
 
        /* Use stored value (EEPROM defaults) of AUTOC to find KR/KX4 support*/
        if (hw->mac.orig_link_settings_stored)
-               orig_autoc = hw->mac.orig_autoc;
+               autoc = hw->mac.orig_autoc;
        else
-               orig_autoc = autoc;
+               autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+
+       orig_autoc = autoc;
+       start_autoc = hw->mac.cached_autoc;
+       link_mode = autoc & IXGBE_AUTOC_LMS_MASK;
+       pma_pmd_1g = autoc & IXGBE_AUTOC_1G_PMA_PMD_MASK;
 
        if (link_mode == IXGBE_AUTOC_LMS_KX4_KX_KR ||
            link_mode == IXGBE_AUTOC_LMS_KX4_KX_KR_1G_AN ||
@@ -887,6 +889,7 @@ static s32 ixgbe_setup_mac_link_82599(struct ixgbe_hw *hw,
 
                /* Restart link */
                IXGBE_WRITE_REG(hw, IXGBE_AUTOC, autoc);
+               hw->mac.cached_autoc = autoc;
                ixgbe_reset_pipeline_82599(hw);
 
                if (got_lock)
@@ -958,7 +961,7 @@ static s32 ixgbe_reset_hw_82599(struct ixgbe_hw *hw)
 {
        ixgbe_link_speed link_speed;
        s32 status;
-       u32 ctrl, i, autoc, autoc2;
+       u32 ctrl, i, autoc2;
        u32 curr_lms;
        bool link_up = false;
 
@@ -991,8 +994,12 @@ static s32 ixgbe_reset_hw_82599(struct ixgbe_hw *hw)
        if (hw->phy.reset_disable == false && hw->phy.ops.reset != NULL)
                hw->phy.ops.reset(hw);
 
-       /* remember AUTOC LMS from before we reset */
-       curr_lms = IXGBE_READ_REG(hw, IXGBE_AUTOC) & IXGBE_AUTOC_LMS_MASK;
+       /* remember AUTOC from before we reset */
+       if (hw->mac.cached_autoc)
+               curr_lms = hw->mac.cached_autoc & IXGBE_AUTOC_LMS_MASK;
+       else
+               curr_lms = IXGBE_READ_REG(hw, IXGBE_AUTOC) &
+                          IXGBE_AUTOC_LMS_MASK;
 
 mac_reset_top:
        /*
@@ -1042,10 +1049,10 @@ mac_reset_top:
         * stored off yet.  Otherwise restore the stored original
         * values since the reset operation sets back to defaults.
         */
-       autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+       hw->mac.cached_autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC);
        autoc2 = IXGBE_READ_REG(hw, IXGBE_AUTOC2);
        if (hw->mac.orig_link_settings_stored == false) {
-               hw->mac.orig_autoc = autoc;
+               hw->mac.orig_autoc = hw->mac.cached_autoc;
                hw->mac.orig_autoc2 = autoc2;
                hw->mac.orig_link_settings_stored = true;
        } else {
@@ -1062,7 +1069,7 @@ mac_reset_top:
                                (hw->mac.orig_autoc & ~IXGBE_AUTOC_LMS_MASK) |
                                curr_lms;
 
-               if (autoc != hw->mac.orig_autoc) {
+               if (hw->mac.cached_autoc != hw->mac.orig_autoc) {
                        /* Need SW/FW semaphore around AUTOC writes if LESM is
                         * on, likewise reset_pipeline requires us to hold
                         * this lock as it also writes to AUTOC.
@@ -1078,6 +1085,7 @@ mac_reset_top:
                        }
 
                        IXGBE_WRITE_REG(hw, IXGBE_AUTOC, hw->mac.orig_autoc);
+                       hw->mac.cached_autoc = hw->mac.orig_autoc;
                        ixgbe_reset_pipeline_82599(hw);
 
                        if (got_lock)
@@ -2181,7 +2189,7 @@ s32 ixgbe_reset_pipeline_82599(struct ixgbe_hw *hw)
        s32 i, autoc_reg, ret_val;
        s32 anlp1_reg = 0;
 
-       autoc_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC);
+       autoc_reg = hw->mac.cached_autoc;
        autoc_reg |= IXGBE_AUTOC_AN_RESTART;
 
        /* Write AUTOC register with toggled LMS[2] bit and Restart_AN */

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 6d70665..7480f7b 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -2928,6 +2928,7 @@ struct ixgbe_mac_info {
        u32                             max_tx_queues;
        u32                             max_rx_queues;
        u32                             orig_autoc;
+       u32                             cached_autoc;
        u32                             orig_autoc2;
        bool                            orig_link_settings_stored;
        bool                            autotry_restart;