From patchwork Mon Mar 5 21:40:26 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [net, v2, 2/6] Partial revert "e1000e: Avoid receiver overrun interrupt bursts" X-Patchwork-Submitter: "Kirsher, Jeffrey T" X-Patchwork-Id: 881769 X-Patchwork-Delegate: davem@davemloft.net Message-Id: <20180305214030.25141-3-jeffrey.t.kirsher@intel.com> To: davem@davemloft.net Cc: Benjamin Poirier , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, jogreene@redhat.com, Jeff Kirsher Date: Mon, 5 Mar 2018 13:40:26 -0800 From: Jeff Kirsher List-Id: From: Benjamin Poirier This partially reverts commit 4aea7a5c5e940c1723add439f4088844cd26196d. We keep the fix for the first part of the problem (1) described in the log of that commit, that is to read ICR in the other interrupt handler. We remove the fix for the second part of the problem (2), Other interrupt throttling. Bursts of "Other" interrupts may once again occur during rxo (receive overflow) traffic conditions. This is deemed acceptable in the interest of avoiding unforeseen fallout from changes that are not strictly necessary. As discussed, the e1000e driver should be in "maintenance mode". Link: https://www.spinics.net/lists/netdev/msg480675.html Signed-off-by: Benjamin Poirier Acked-by: Alexander Duyck Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000e/netdev.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -1911,21 +1911,10 @@ static irqreturn_t e1000_msix_other(int struct e1000_adapter *adapter = netdev_priv(netdev); struct e1000_hw *hw = &adapter->hw; u32 icr; - bool enable = true; icr = er32(ICR); ew32(ICR, E1000_ICR_OTHER); - if (icr & E1000_ICR_RXO) { - ew32(ICR, E1000_ICR_RXO); - enable = false; - /* napi poll will re-enable Other, make sure it runs */ - if (napi_schedule_prep(&adapter->napi)) { - adapter->total_rx_bytes = 0; - adapter->total_rx_packets = 0; - __napi_schedule(&adapter->napi); - } - } if (icr & E1000_ICR_LSC) { ew32(ICR, E1000_ICR_LSC); hw->mac.get_link_status = true; @@ -1934,7 +1923,7 @@ static irqreturn_t e1000_msix_other(int mod_timer(&adapter->watchdog_timer, jiffies + 1); } - if (enable && !test_bit(__E1000_DOWN, &adapter->state)) + if (!test_bit(__E1000_DOWN, &adapter->state)) ew32(IMS, E1000_IMS_OTHER); return IRQ_HANDLED; @@ -2704,8 +2693,7 @@ static int e1000e_poll(struct napi_struc napi_complete_done(napi, work_done); if (!test_bit(__E1000_DOWN, &adapter->state)) { if (adapter->msix_entries) - ew32(IMS, adapter->rx_ring->ims_val | - E1000_IMS_OTHER); + ew32(IMS, adapter->rx_ring->ims_val); else e1000_irq_enable(adapter); }