From: Peter P Waskiewicz Jr Date: Tue, 1 Sep 2009 13:49:56 +0000 (+0000) Subject: ixgbe: Properly disable DCB arbiters prior to applying changes X-Git-Tag: v2.6.32-rc1~703^2~168 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=b7fdb714856541cd4b659a7b86ec04415e2809f7;p=~emulex%2Finfiniband.git ixgbe: Properly disable DCB arbiters prior to applying changes When disabling the Rx and Tx data arbiters prior to configuration changes, the arbiters were not being shut down properly. This can create a race in the DCB hardware blocks, and potentially hang the arbiters. Also, the Tx descriptor arbiter shouldn't be disabled when applying configuration changes; disabling this arbiter can cause a Tx hang. Signed-off-by: Peter P Waskiewicz Jr Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ixgbe/ixgbe_dcb_82599.c index 589f62c7062..ec8a252636d 100644 --- a/drivers/net/ixgbe/ixgbe_dcb_82599.c +++ b/drivers/net/ixgbe/ixgbe_dcb_82599.c @@ -145,8 +145,12 @@ s32 ixgbe_dcb_config_rx_arbiter_82599(struct ixgbe_hw *hw, u32 credit_max = 0; u8 i = 0; - /* Disable the arbiter before changing parameters */ - IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, IXGBE_RTRPCS_ARBDIS); + /* + * Disable the arbiter before changing parameters + * (always enable recycle mode; WSP) + */ + reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC | IXGBE_RTRPCS_ARBDIS; + IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg); /* Map all traffic classes to their UP, 1 to 1 */ reg = 0; @@ -194,9 +198,6 @@ s32 ixgbe_dcb_config_tx_desc_arbiter_82599(struct ixgbe_hw *hw, u32 reg, max_credits; u8 i; - /* Disable the arbiter before changing parameters */ - IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, IXGBE_RTTDCS_ARBDIS); - /* Clear the per-Tx queue credits; we use per-TC instead */ for (i = 0; i < 128; i++) { IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i); @@ -244,8 +245,14 @@ s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw, u32 reg; u8 i; - /* Disable the arbiter before changing parameters */ - IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, IXGBE_RTTPCS_ARBDIS); + /* + * Disable the arbiter before changing parameters + * (always enable recycle mode; SP; arb delay) + */ + reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM | + (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT) | + IXGBE_RTTPCS_ARBDIS; + IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg); /* Map all traffic classes to their UP, 1 to 1 */ reg = 0;