From ff9174291eddb3f42a1e9429f8b919bebc33533b Mon Sep 17 00:00:00 2001 From: Yanir Lubetkin Date: Tue, 2 Jun 2015 17:05:38 +0300 Subject: [PATCH] e1000e: fix flush_desc_ring implementation The indication that a descriptor ring flush is required was read from FEXTNVM7 by mistake. It should be read from the PCI config space. Signed-off-by: Yanir Lubetkin Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000e/e1000.h | 2 ++ drivers/net/ethernet/intel/e1000e/ich8lan.h | 1 - drivers/net/ethernet/intel/e1000e/netdev.c | 12 +++++++----- 3 files changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h index 0abc942c966e..e78487ab18da 100644 --- a/drivers/net/ethernet/intel/e1000e/e1000.h +++ b/drivers/net/ethernet/intel/e1000e/e1000.h @@ -98,6 +98,8 @@ struct e1000_info; #define DEFAULT_RADV 8 #define BURST_RDTR 0x20 #define BURST_RADV 0x20 +#define PCICFG_DESC_RING_STATUS 0xe4 +#define FLUSH_DESC_REQUIRED 0x100 /* in the case of WTHRESH, it appears at least the 82571/2 hardware * writes back 4 descriptors when WTHRESH=5, and 3 descriptors when diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.h b/drivers/net/ethernet/intel/e1000e/ich8lan.h index bf72ef809df8..1500536a6748 100644 --- a/drivers/net/ethernet/intel/e1000e/ich8lan.h +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.h @@ -100,7 +100,6 @@ #define E1000_FEXTNVM7_DISABLE_PB_READ 0x00040000 #define E1000_FEXTNVM7_DISABLE_SMB_PERST 0x00000020 -#define E1000_FEXTNVM7_NEED_DESCRING_FLUSH 0x00000100 #define E1000_FEXTNVM11_DISABLE_MULR_FIX 0x00002000 /* bit24: RXDCTL thresholds granularity: 0 - cache lines, 1 - descriptors */ diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index b2d77a5c25c0..4f029b6d0cf0 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3867,7 +3867,7 @@ static void e1000_flush_rx_ring(struct e1000_adapter *adapter) static void e1000_flush_desc_rings(struct e1000_adapter *adapter) { - u32 hang_state; + u16 hang_state; u32 fext_nvm11, tdlen; struct e1000_hw *hw = &adapter->hw; @@ -3877,13 +3877,15 @@ static void e1000_flush_desc_rings(struct e1000_adapter *adapter) ew32(FEXTNVM11, fext_nvm11); /* do nothing if we're not in faulty state, or if the queue is empty */ tdlen = er32(TDLEN(0)); - hang_state = er32(FEXTNVM7); - if (!(hang_state & E1000_FEXTNVM7_NEED_DESCRING_FLUSH) || !tdlen) + pci_read_config_word(adapter->pdev, PCICFG_DESC_RING_STATUS, + &hang_state); + if (!(hang_state & FLUSH_DESC_REQUIRED) || !tdlen) return; e1000_flush_tx_ring(adapter); /* recheck, maybe the fault is caused by the rx ring */ - hang_state = er32(FEXTNVM7); - if (hang_state & E1000_FEXTNVM7_NEED_DESCRING_FLUSH) + pci_read_config_word(adapter->pdev, PCICFG_DESC_RING_STATUS, + &hang_state); + if (hang_state & FLUSH_DESC_REQUIRED) e1000_flush_rx_ring(adapter); } -- 2.11.0