netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
To: davem@davemloft.net
Cc: Emil Tantilov <emil.s.tantilov@intel.com>,
	netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com,
	jogreene@redhat.com, guru.anbalagane@oracle.com,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Subject: [net-next 4/4] ixgbe: use atomic bitwise operations when handling reset requests
Date: Thu, 18 Aug 2016 23:03:36 -0700	[thread overview]
Message-ID: <1471586616-64728-5-git-send-email-jeffrey.t.kirsher@intel.com> (raw)
In-Reply-To: <1471586616-64728-1-git-send-email-jeffrey.t.kirsher@intel.com>

From: Emil Tantilov <emil.s.tantilov@intel.com>

Use atomic bitwise operations when setting and checking reset
requests. This should help with possible races in the service task.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe.h      |  2 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 16 +++++++---------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 9475ff9..5628e2d 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -653,7 +653,6 @@ struct ixgbe_adapter {
 #define IXGBE_FLAG2_TEMP_SENSOR_EVENT		BIT(3)
 #define IXGBE_FLAG2_SEARCH_FOR_SFP		BIT(4)
 #define IXGBE_FLAG2_SFP_NEEDS_RESET		BIT(5)
-#define IXGBE_FLAG2_RESET_REQUESTED		BIT(6)
 #define IXGBE_FLAG2_FDIR_REQUIRES_REINIT	BIT(7)
 #define IXGBE_FLAG2_RSS_FIELD_IPV4_UDP		BIT(8)
 #define IXGBE_FLAG2_RSS_FIELD_IPV6_UDP		BIT(9)
@@ -840,6 +839,7 @@ enum ixgbe_state_t {
 	__IXGBE_IN_SFP_INIT,
 	__IXGBE_PTP_RUNNING,
 	__IXGBE_PTP_TX_IN_PROGRESS,
+	__IXGBE_RESET_REQUESTED,
 };
 
 struct ixgbe_cb {
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index bbbc5b8..6bf131f 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1103,7 +1103,7 @@ static void ixgbe_tx_timeout_reset(struct ixgbe_adapter *adapter)
 
 	/* Do the reset outside of interrupt context */
 	if (!test_bit(__IXGBE_DOWN, &adapter->state)) {
-		adapter->flags2 |= IXGBE_FLAG2_RESET_REQUESTED;
+		set_bit(__IXGBE_RESET_REQUESTED, &adapter->state);
 		e_warn(drv, "initiating reset due to tx timeout\n");
 		ixgbe_service_event_schedule(adapter);
 	}
@@ -2777,7 +2777,7 @@ static irqreturn_t ixgbe_msix_other(int irq, void *data)
 		}
 		if (eicr & IXGBE_EICR_ECC) {
 			e_info(link, "Received ECC Err, initiating reset\n");
-			adapter->flags2 |= IXGBE_FLAG2_RESET_REQUESTED;
+			set_bit(__IXGBE_RESET_REQUESTED, &adapter->state);
 			ixgbe_service_event_schedule(adapter);
 			IXGBE_WRITE_REG(hw, IXGBE_EICR, IXGBE_EICR_ECC);
 		}
@@ -3007,7 +3007,7 @@ static irqreturn_t ixgbe_intr(int irq, void *data)
 	case ixgbe_mac_x550em_a:
 		if (eicr & IXGBE_EICR_ECC) {
 			e_info(link, "Received ECC Err, initiating reset\n");
-			adapter->flags2 |= IXGBE_FLAG2_RESET_REQUESTED;
+			set_bit(__IXGBE_RESET_REQUESTED, &adapter->state);
 			ixgbe_service_event_schedule(adapter);
 			IXGBE_WRITE_REG(hw, IXGBE_EICR, IXGBE_EICR_ECC);
 		}
@@ -5500,8 +5500,8 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
 
 	ixgbe_napi_disable_all(adapter);
 
-	adapter->flags2 &= ~(IXGBE_FLAG2_FDIR_REQUIRES_REINIT |
-			     IXGBE_FLAG2_RESET_REQUESTED);
+	clear_bit(__IXGBE_RESET_REQUESTED, &adapter->state);
+	adapter->flags2 &= ~IXGBE_FLAG2_FDIR_REQUIRES_REINIT;
 	adapter->flags &= ~IXGBE_FLAG_NEED_LINK_UPDATE;
 
 	del_timer_sync(&adapter->service_timer);
@@ -6921,7 +6921,7 @@ static void ixgbe_watchdog_flush_tx(struct ixgbe_adapter *adapter)
 			 * (Do the reset outside of interrupt context).
 			 */
 			e_warn(drv, "initiating reset to clear Tx work after link loss\n");
-			adapter->flags2 |= IXGBE_FLAG2_RESET_REQUESTED;
+			set_bit(__IXGBE_RESET_REQUESTED, &adapter->state);
 		}
 	}
 }
@@ -7187,11 +7187,9 @@ static void ixgbe_phy_interrupt_subtask(struct ixgbe_adapter *adapter)
 
 static void ixgbe_reset_subtask(struct ixgbe_adapter *adapter)
 {
-	if (!(adapter->flags2 & IXGBE_FLAG2_RESET_REQUESTED))
+	if (!test_and_clear_bit(__IXGBE_RESET_REQUESTED, &adapter->state))
 		return;
 
-	adapter->flags2 &= ~IXGBE_FLAG2_RESET_REQUESTED;
-
 	/* If we're already down, removing or resetting, just bail */
 	if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 	    test_bit(__IXGBE_REMOVING, &adapter->state) ||
-- 
2.7.4

  parent reply	other threads:[~2016-08-19  6:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-19  6:03 [net-next 0/4][pull request] 10GbE Intel Wired LAN Driver Updates 2016-08-18 Jeff Kirsher
2016-08-19  6:03 ` [net-next 1/4] ixgbe: only check Tx queue enablement when debugging Jeff Kirsher
2016-08-19  6:03 ` [net-next 2/4] ixgbevf: change hw_dbg to use netdev_dbg Jeff Kirsher
2016-08-19  6:03 ` [net-next 3/4] ixgbevf: only check Tx queue enablement when debugging Jeff Kirsher
2016-08-19  6:03 ` Jeff Kirsher [this message]
2016-08-20  0:19 ` [net-next 0/4][pull request] 10GbE Intel Wired LAN Driver Updates 2016-08-18 David Miller

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1471586616-64728-5-git-send-email-jeffrey.t.kirsher@intel.com \
    --to=jeffrey.t.kirsher@intel.com \
    --cc=davem@davemloft.net \
    --cc=emil.s.tantilov@intel.com \
    --cc=guru.anbalagane@oracle.com \
    --cc=jogreene@redhat.com \
    --cc=netdev@vger.kernel.org \
    --cc=nhorman@redhat.com \
    --cc=sassmann@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).