From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-next 8/9] e1000e: Do not write lsc to ics in msi-x mode Date: Mon, 14 Dec 2015 21:38:43 -0800 Message-ID: <1450157924-58901-9-git-send-email-jeffrey.t.kirsher@intel.com> References: <1450157924-58901-1-git-send-email-jeffrey.t.kirsher@intel.com> Cc: Benjamin Poirier , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, jogreene@redhat.com, Jeff Kirsher To: davem@davemloft.net Return-path: Received: from mga09.intel.com ([134.134.136.24]:59684 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751577AbbLOFiu (ORCPT ); Tue, 15 Dec 2015 00:38:50 -0500 In-Reply-To: <1450157924-58901-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Benjamin Poirier In msi-x mode, there is no handler for the lsc interrupt so there is no point in writing that to ics now that we always assume Other interrupts are caused by lsc. Reviewed-by: Jasna Hodzic Signed-off-by: Benjamin Poirier Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000e/defines.h | 3 ++- drivers/net/ethernet/intel/e1000e/netdev.c | 28 +++++++++++++++++----------- 2 files changed, 19 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h index 133d407..f7c7804 100644 --- a/drivers/net/ethernet/intel/e1000e/defines.h +++ b/drivers/net/ethernet/intel/e1000e/defines.h @@ -441,12 +441,13 @@ #define E1000_IMS_RXQ1 E1000_ICR_RXQ1 /* Rx Queue 1 Interrupt */ #define E1000_IMS_TXQ0 E1000_ICR_TXQ0 /* Tx Queue 0 Interrupt */ #define E1000_IMS_TXQ1 E1000_ICR_TXQ1 /* Tx Queue 1 Interrupt */ -#define E1000_IMS_OTHER E1000_ICR_OTHER /* Other Interrupts */ +#define E1000_IMS_OTHER E1000_ICR_OTHER /* Other Interrupt */ /* Interrupt Cause Set */ #define E1000_ICS_LSC E1000_ICR_LSC /* Link Status Change */ #define E1000_ICS_RXSEQ E1000_ICR_RXSEQ /* Rx sequence error */ #define E1000_ICS_RXDMT0 E1000_ICR_RXDMT0 /* Rx desc min. threshold */ +#define E1000_ICS_OTHER E1000_ICR_OTHER /* Other Interrupt */ /* Transmit Descriptor Control */ #define E1000_TXDCTL_PTHRESH 0x0000003F /* TXDCTL Prefetch Threshold */ diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 56bc422..d59c0bc 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -4132,10 +4132,24 @@ void e1000e_reset(struct e1000_adapter *adapter) } -void e1000e_up(struct e1000_adapter *adapter) +/** + * e1000e_trigger_lsc - trigger an LSC interrupt + * @adapter: + * + * Fire a link status change interrupt to start the watchdog. + **/ +static void e1000e_trigger_lsc(struct e1000_adapter *adapter) { struct e1000_hw *hw = &adapter->hw; + if (adapter->msix_entries) + ew32(ICS, E1000_ICS_OTHER); + else + ew32(ICS, E1000_ICS_LSC); +} + +void e1000e_up(struct e1000_adapter *adapter) +{ /* hardware has been reset, we need to reload some things */ e1000_configure(adapter); @@ -4147,11 +4161,7 @@ void e1000e_up(struct e1000_adapter *adapter) netif_start_queue(adapter->netdev); - /* fire a link change interrupt to start the watchdog */ - if (adapter->msix_entries) - ew32(ICS, E1000_ICS_LSC | E1000_ICR_OTHER); - else - ew32(ICS, E1000_ICS_LSC); + e1000e_trigger_lsc(adapter); } static void e1000e_flush_descriptors(struct e1000_adapter *adapter) @@ -4576,11 +4586,7 @@ static int e1000_open(struct net_device *netdev) hw->mac.get_link_status = true; pm_runtime_put(&pdev->dev); - /* fire a link status change interrupt to start the watchdog */ - if (adapter->msix_entries) - ew32(ICS, E1000_ICS_LSC | E1000_ICR_OTHER); - else - ew32(ICS, E1000_ICS_LSC); + e1000e_trigger_lsc(adapter); return 0; -- 2.5.0