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authorPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>2009-07-30 12:26:00 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-30 19:00:30 -0700
commit0a924578bc4a2823a95c151f56975c71f5c156bb (patch)
tree58af9e5303f5c5d552541290a5194b0d743cd1bd /drivers
parent0c19d6af9253f19b41821c29b9c49c2214f19425 (diff)
ixgbe: Fix RSC completion delay causing Rx interrupts to stop
When a user disables interrupt throttling with ethtool on 82599 devices, the interrupt timer may not be re-enabled if hardware RSC is running. The RSC completions in hardware don't complete before the next ITR event tries to fire, so the ITR timer never gets re-armed. This patch increases the amount of time between interrupts when throttling is disabled (rx-usecs = 0) when the hardware RSC deature is enabled. Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ixgbe/ixgbe.h2
-rw-r--r--drivers/net/ixgbe/ixgbe_ethtool.c5
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index 1b12c7ba275..e11d83d5852 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -96,6 +96,8 @@
#define IXGBE_TX_FLAGS_VLAN_PRIO_MASK 0x0000e000
#define IXGBE_TX_FLAGS_VLAN_SHIFT 16
+#define IXGBE_MAX_RSC_INT_RATE 162760
+
/* wrapper around a pointer to a socket buffer,
* so a DMA handle can be stored along with the buffer */
struct ixgbe_tx_buffer {
diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index 7ddb50c03f0..79144e950a3 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -1975,7 +1975,10 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
* any other value means disable eitr, which is best
* served by setting the interrupt rate very high
*/
- adapter->eitr_param = IXGBE_MAX_INT_RATE;
+ if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
+ adapter->eitr_param = IXGBE_MAX_RSC_INT_RATE;
+ else
+ adapter->eitr_param = IXGBE_MAX_INT_RATE;
adapter->itr_setting = 0;
}