netdev - [PATCH 1/5] igb: force all queues to interrupt once every 2 seconds

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Date:	Tue, 26 Aug 2008 04:25:03 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	akpm@...ux-foundation.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: [PATCH 1/5] igb: force all queues to interrupt once every 2 seconds

From: Alexander Duyck <alexander.h.duyck@...el.com>

Set the EICS bit for each of the RX queues at least once every 2 seconds to
prevent the rx queues from stalling.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---

 drivers/net/igb/igb_main.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 4b19abb..40a205e 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2279,7 +2279,9 @@ static void igb_watchdog_task(struct work_struct *work)
 	struct igb_ring *tx_ring = adapter->tx_ring;
 	struct e1000_mac_info *mac = &adapter->hw.mac;
 	u32 link;
+	u32 eics = 0;
 	s32 ret_val;
+	int i;
 
 	if ((netif_carrier_ok(netdev)) &&
 	    (rd32(E1000_STATUS) & E1000_STATUS_LU))
@@ -2381,7 +2383,13 @@ link_up:
 	}
 
 	/* Cause software interrupt to ensure rx ring is cleaned */
-	wr32(E1000_ICS, E1000_ICS_RXDMT0);
+	if (adapter->msix_entries) {
+		for (i = 0; i < adapter->num_rx_queues; i++)
+			eics |= adapter->rx_ring[i].eims_value;
+		wr32(E1000_EICS, eics);
+	} else {
+		wr32(E1000_ICS, E1000_ICS_RXDMT0);
+	}
 
 	/* Force detection of hung controller every watchdog period */
 	tx_ring->detect_tx_hung = true;

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