From ee98b577e7711d5890ded2c7b05578a29512bd39 Mon Sep 17 00:00:00 2001 From: Jacob Keller Date: Sat, 22 Feb 2014 01:23:56 +0000 Subject: [PATCH] ixgbe: fix ixgbe_setup_mac_link_82599 autoc variables This patch fixes flow control autonegotiation for KR/KX/K4 interfaces. When setting up MAC link, the cached autoc value and current autoc value were being incorrectly used to determine whether link reset is required. This resulted in the driver ignoring and discarding flow control negotiation changes that occur since the caching happened, as well as when the mac was being setup. This patch also splits the assignments for the 3 autoc variables into their own block, and adds a comment explaining what each one means, in order to help keep logic more straightforward while reading the code. CC: Arun Sharma Reported-by: Sourav Chatterjee Signed-off-by: Jacob Keller Tested-by: Phil Schmitt Signed-off-by: Jeff Kirsher --- .../net/ethernet/intel/ixgbe/ixgbe_82599.c | 22 ++++++++++--------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c index ef808bcec276..e0fe8e88fbfa 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c @@ -1031,15 +1031,19 @@ static s32 ixgbe_setup_mac_link_82599(struct ixgbe_hw *hw, ixgbe_link_speed speed, bool autoneg_wait_to_complete) { + bool autoneg = false; s32 status = 0; - u32 autoc, pma_pmd_1g, link_mode, start_autoc; + u32 pma_pmd_1g, link_mode, links_reg, i; u32 autoc2 = IXGBE_READ_REG(hw, IXGBE_AUTOC2); - u32 orig_autoc = 0; u32 pma_pmd_10g_serial = autoc2 & IXGBE_AUTOC2_10G_SERIAL_PMA_PMD_MASK; - u32 links_reg; - u32 i; ixgbe_link_speed link_capabilities = IXGBE_LINK_SPEED_UNKNOWN; - bool autoneg = false; + + /* holds the value of AUTOC register at this current point in time */ + u32 current_autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC); + /* holds the cached value of AUTOC register */ + u32 orig_autoc = 0; + /* temporary variable used for comparison purposes */ + u32 autoc = current_autoc; /* Check to see if speed passed in is supported. */ status = hw->mac.ops.get_link_capabilities(hw, &link_capabilities, @@ -1056,12 +1060,10 @@ 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) - autoc = hw->mac.orig_autoc; + orig_autoc = hw->mac.orig_autoc; else - autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC); + orig_autoc = autoc; - orig_autoc = autoc; - start_autoc = IXGBE_READ_REG(hw, IXGBE_AUTOC); link_mode = autoc & IXGBE_AUTOC_LMS_MASK; pma_pmd_1g = autoc & IXGBE_AUTOC_1G_PMA_PMD_MASK; @@ -1101,7 +1103,7 @@ static s32 ixgbe_setup_mac_link_82599(struct ixgbe_hw *hw, } } - if (autoc != start_autoc) { + if (autoc != current_autoc) { /* Restart link */ status = hw->mac.ops.prot_autoc_write(hw, autoc, false); if (status) -- 2.34.1