kernel: fix receiver overflow for 82574L under load
Under heavy load it's possible to overrun the 82574L. When this
happens, Other Interrupt happens and that's erroneously interpreted
as a Link Status Change.
http://patchwork.ozlabs.org/patch/792260/
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This commit is contained in:
Philip Prindeville
John Crispin
parent
1c4a116a30
commit
a0c05a7c94
1 changed files with 327 additions and 0 deletions
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@ -0,0 +1,327 @@
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Subject: [1/5] e1000e: Fix error path in link detection
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From: Benjamin Poirier <bpoirier@suse.com>
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X-Patchwork-Id: 792259
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Message-Id: <20170721183627.13373-1-bpoirier@suse.com>
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To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Cc: netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
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linux-kernel@vger.kernel.org,
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Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Date: Fri, 21 Jul 2017 11:36:23 -0700
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In case of error from e1e_rphy(), the loop will exit early and "success"
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will be set to true erroneously.
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Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
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---
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drivers/net/ethernet/intel/e1000e/phy.c | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c
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index d78d47b41a71..86ff0969efb6 100644
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--- a/drivers/net/ethernet/intel/e1000e/phy.c
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+++ b/drivers/net/ethernet/intel/e1000e/phy.c
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@@ -1744,6 +1744,7 @@ s32 e1000e_phy_has_link_generic(struct e1000_hw *hw, u32 iterations,
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s32 ret_val = 0;
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u16 i, phy_status;
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+ *success = false;
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for (i = 0; i < iterations; i++) {
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/* Some PHYs require the MII_BMSR register to be read
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* twice due to the link bit being sticky. No harm doing
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@@ -1763,16 +1764,16 @@ s32 e1000e_phy_has_link_generic(struct e1000_hw *hw, u32 iterations,
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ret_val = e1e_rphy(hw, MII_BMSR, &phy_status);
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if (ret_val)
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break;
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- if (phy_status & BMSR_LSTATUS)
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+ if (phy_status & BMSR_LSTATUS) {
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+ *success = true;
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break;
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+ }
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if (usec_interval >= 1000)
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msleep(usec_interval / 1000);
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else
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udelay(usec_interval);
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}
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- *success = (i < iterations);
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-
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return ret_val;
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}
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Subject: [2/5] e1000e: Fix wrong comment related to link detection
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From: Benjamin Poirier <bpoirier@suse.com>
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X-Patchwork-Id: 792257
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Message-Id: <20170721183627.13373-2-bpoirier@suse.com>
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To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Cc: netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
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linux-kernel@vger.kernel.org,
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Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Date: Fri, 21 Jul 2017 11:36:24 -0700
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Reading e1000e_check_for_copper_link() shows that get_link_status is set to
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false after link has been detected. Therefore, it stays TRUE until then.
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Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
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---
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drivers/net/ethernet/intel/e1000e/netdev.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
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index 2dcb5463d9b8..58a87134d2e5 100644
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--- a/drivers/net/ethernet/intel/e1000e/netdev.c
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+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
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@@ -5074,7 +5074,7 @@ static bool e1000e_has_link(struct e1000_adapter *adapter)
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/* get_link_status is set on LSC (link status) interrupt or
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* Rx sequence error interrupt. get_link_status will stay
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- * false until the check_for_link establishes link
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+ * true until the check_for_link establishes link
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* for copper adapters ONLY
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*/
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switch (hw->phy.media_type) {
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@@ -5092,7 +5092,7 @@ static bool e1000e_has_link(struct e1000_adapter *adapter)
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break;
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case e1000_media_type_internal_serdes:
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ret_val = hw->mac.ops.check_for_link(hw);
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- link_active = adapter->hw.mac.serdes_has_link;
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+ link_active = hw->mac.serdes_has_link;
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break;
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default:
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case e1000_media_type_unknown:
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Content-Transfer-Encoding: 7bit
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Subject: [3/5] e1000e: Fix return value test
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From: Benjamin Poirier <bpoirier@suse.com>
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X-Patchwork-Id: 792258
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Message-Id: <20170721183627.13373-3-bpoirier@suse.com>
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To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Cc: netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
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linux-kernel@vger.kernel.org,
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Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Date: Fri, 21 Jul 2017 11:36:25 -0700
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All the helpers return -E1000_ERR_PHY.
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Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
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---
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drivers/net/ethernet/intel/e1000e/netdev.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
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index 58a87134d2e5..fc6a1d9999b2 100644
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--- a/drivers/net/ethernet/intel/e1000e/netdev.c
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+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
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@@ -5099,7 +5099,7 @@ static bool e1000e_has_link(struct e1000_adapter *adapter)
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break;
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}
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- if ((ret_val == E1000_ERR_PHY) && (hw->phy.type == e1000_phy_igp_3) &&
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+ if ((ret_val == -E1000_ERR_PHY) && (hw->phy.type == e1000_phy_igp_3) &&
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(er32(CTRL) & E1000_PHY_CTRL_GBE_DISABLE)) {
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/* See e1000_kmrn_lock_loss_workaround_ich8lan() */
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e_info("Gigabit has been disabled, downgrading speed\n");
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Content-Transfer-Encoding: 7bit
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Subject: [4/5] e1000e: Separate signaling for link check/link up
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From: Benjamin Poirier <bpoirier@suse.com>
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X-Patchwork-Id: 792262
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Message-Id: <20170721183627.13373-4-bpoirier@suse.com>
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To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Cc: netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
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linux-kernel@vger.kernel.org,
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Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Date: Fri, 21 Jul 2017 11:36:26 -0700
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Lennart reported the following race condition:
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\ e1000_watchdog_task
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\ e1000e_has_link
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\ hw->mac.ops.check_for_link() === e1000e_check_for_copper_link
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/* link is up */
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mac->get_link_status = false;
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/* interrupt */
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\ e1000_msix_other
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hw->mac.get_link_status = true;
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link_active = !hw->mac.get_link_status
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/* link_active is false, wrongly */
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This problem arises because the single flag get_link_status is used to
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signal two different states: link status needs checking and link status is
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down.
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Avoid the problem by using the return value of .check_for_link to signal
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the link status to e1000e_has_link().
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Reported-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
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---
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drivers/net/ethernet/intel/e1000e/mac.c | 11 ++++++++---
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drivers/net/ethernet/intel/e1000e/netdev.c | 2 +-
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2 files changed, 9 insertions(+), 4 deletions(-)
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diff --git a/drivers/net/ethernet/intel/e1000e/mac.c b/drivers/net/ethernet/intel/e1000e/mac.c
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index b322011ec282..f457c5703d0c 100644
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--- a/drivers/net/ethernet/intel/e1000e/mac.c
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+++ b/drivers/net/ethernet/intel/e1000e/mac.c
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@@ -410,6 +410,9 @@ void e1000e_clear_hw_cntrs_base(struct e1000_hw *hw)
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* Checks to see of the link status of the hardware has changed. If a
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* change in link status has been detected, then we read the PHY registers
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* to get the current speed/duplex if link exists.
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+ *
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+ * Returns a negative error code (-E1000_ERR_*) or 0 (link down) or 1 (link
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+ * up).
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**/
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s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
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{
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@@ -423,7 +426,7 @@ s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
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* Change or Rx Sequence Error interrupt.
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*/
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if (!mac->get_link_status)
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- return 0;
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+ return 1;
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/* First we want to see if the MII Status Register reports
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* link. If so, then we want to get the current speed/duplex
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@@ -461,10 +464,12 @@ s32 e1000e_check_for_copper_link(struct e1000_hw *hw)
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* different link partner.
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*/
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ret_val = e1000e_config_fc_after_link_up(hw);
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- if (ret_val)
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+ if (ret_val) {
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e_dbg("Error configuring flow control\n");
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+ return ret_val;
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+ }
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- return ret_val;
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+ return 1;
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}
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/**
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diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
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index fc6a1d9999b2..5a8ab1136566 100644
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--- a/drivers/net/ethernet/intel/e1000e/netdev.c
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+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
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@@ -5081,7 +5081,7 @@ static bool e1000e_has_link(struct e1000_adapter *adapter)
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case e1000_media_type_copper:
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if (hw->mac.get_link_status) {
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ret_val = hw->mac.ops.check_for_link(hw);
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- link_active = !hw->mac.get_link_status;
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+ link_active = ret_val > 0;
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} else {
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link_active = true;
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}
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Content-Transfer-Encoding: 7bit
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Subject: [5/5] e1000e: Avoid receiver overrun interrupt bursts
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From: Benjamin Poirier <bpoirier@suse.com>
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X-Patchwork-Id: 792260
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Message-Id: <20170721183627.13373-5-bpoirier@suse.com>
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To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Cc: netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
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linux-kernel@vger.kernel.org,
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Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Date: Fri, 21 Jul 2017 11:36:27 -0700
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When e1000e_poll() is not fast enough to keep up with incoming traffic, the
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adapter (when operating in msix mode) raises the Other interrupt to signal
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Receiver Overrun.
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This is a double problem because 1) at the moment e1000_msix_other()
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assumes that it is only called in case of Link Status Change and 2) if the
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condition persists, the interrupt is repeatedly raised again in quick
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succession.
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Ideally we would configure the Other interrupt to not be raised in case of
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receiver overrun but this doesn't seem possible on this adapter. Instead,
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we handle the first part of the problem by reverting to the practice of
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reading ICR in the other interrupt handler, like before commit 16ecba59bc33
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("e1000e: Do not read ICR in Other interrupt"). Thanks to commit
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0a8047ac68e5 ("e1000e: Fix msi-x interrupt automask") which cleared IAME
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from CTRL_EXT, reading ICR doesn't interfere with RxQ0, TxQ0 interrupts
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anymore. We handle the second part of the problem by not re-enabling the
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Other interrupt right away when there is overrun. Instead, we wait until
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traffic subsides, napi polling mode is exited and interrupts are
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re-enabled.
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Reported-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
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Fixes: 16ecba59bc33 ("e1000e: Do not read ICR in Other interrupt")
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Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
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---
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drivers/net/ethernet/intel/e1000e/defines.h | 1 +
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drivers/net/ethernet/intel/e1000e/netdev.c | 33 +++++++++++++++++++++++------
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2 files changed, 27 insertions(+), 7 deletions(-)
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diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h
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index 0641c0098738..afb7ebe20b24 100644
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--- a/drivers/net/ethernet/intel/e1000e/defines.h
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+++ b/drivers/net/ethernet/intel/e1000e/defines.h
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@@ -398,6 +398,7 @@
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#define E1000_ICR_LSC 0x00000004 /* Link Status Change */
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#define E1000_ICR_RXSEQ 0x00000008 /* Rx sequence error */
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#define E1000_ICR_RXDMT0 0x00000010 /* Rx desc min. threshold (0) */
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+#define E1000_ICR_RXO 0x00000040 /* Receiver Overrun */
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#define E1000_ICR_RXT0 0x00000080 /* Rx timer intr (ring 0) */
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#define E1000_ICR_ECCER 0x00400000 /* Uncorrectable ECC Error */
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/* If this bit asserted, the driver should claim the interrupt */
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diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
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index 5a8ab1136566..803edd1a6401 100644
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--- a/drivers/net/ethernet/intel/e1000e/netdev.c
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+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
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@@ -1910,12 +1910,30 @@ static irqreturn_t e1000_msix_other(int __always_unused irq, void *data)
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struct net_device *netdev = data;
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|
struct e1000_adapter *adapter = netdev_priv(netdev);
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|
struct e1000_hw *hw = &adapter->hw;
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|
+ u32 icr;
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|
+ bool enable = true;
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|
+
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+ icr = er32(ICR);
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+ if (icr & E1000_ICR_RXO) {
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|
+ ew32(ICR, E1000_ICR_RXO);
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+ enable = false;
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|
+ /* napi poll will re-enable Other, make sure it runs */
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|
+ if (napi_schedule_prep(&adapter->napi)) {
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|
+ adapter->total_rx_bytes = 0;
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|
+ adapter->total_rx_packets = 0;
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|
+ __napi_schedule(&adapter->napi);
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|
+ }
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|
+ }
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|
+ if (icr & E1000_ICR_LSC) {
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|
+ ew32(ICR, E1000_ICR_LSC);
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|
+ hw->mac.get_link_status = true;
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|
+ /* guard against interrupt when we're going down */
|
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|
+ if (!test_bit(__E1000_DOWN, &adapter->state)) {
|
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|
+ mod_timer(&adapter->watchdog_timer, jiffies + 1);
|
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|
+ }
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|
+ }
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|
- hw->mac.get_link_status = true;
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|
-
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|
- /* guard against interrupt when we're going down */
|
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|
- if (!test_bit(__E1000_DOWN, &adapter->state)) {
|
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|
- mod_timer(&adapter->watchdog_timer, jiffies + 1);
|
||||||
|
+ if (enable && !test_bit(__E1000_DOWN, &adapter->state)) {
|
||||||
|
ew32(IMS, E1000_IMS_OTHER);
|
||||||
|
}
|
||||||
|
|
||||||
|
@@ -2687,7 +2705,8 @@ static int e1000e_poll(struct napi_struct *napi, int weight)
|
||||||
|
napi_complete_done(napi, work_done);
|
||||||
|
if (!test_bit(__E1000_DOWN, &adapter->state)) {
|
||||||
|
if (adapter->msix_entries)
|
||||||
|
- ew32(IMS, adapter->rx_ring->ims_val);
|
||||||
|
+ ew32(IMS, adapter->rx_ring->ims_val |
|
||||||
|
+ E1000_IMS_OTHER);
|
||||||
|
else
|
||||||
|
e1000_irq_enable(adapter);
|
||||||
|
}
|
||||||
|
@@ -4204,7 +4223,7 @@ static void e1000e_trigger_lsc(struct e1000_adapter *adapter)
|
||||||
|
struct e1000_hw *hw = &adapter->hw;
|
||||||
|
|
||||||
|
if (adapter->msix_entries)
|
||||||
|
- ew32(ICS, E1000_ICS_OTHER);
|
||||||
|
+ ew32(ICS, E1000_ICS_LSC | E1000_ICS_OTHER);
|
||||||
|
else
|
||||||
|
ew32(ICS, E1000_ICS_LSC);
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue