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| author | Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> | 2009-07-30 12:26:00 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-07-30 19:00:30 -0700 |
| commit | 0a924578bc4a2823a95c151f56975c71f5c156bb (patch) | |
| tree | 58af9e5303f5c5d552541290a5194b0d743cd1bd | |
| parent | 0c19d6af9253f19b41821c29b9c49c2214f19425 (diff) | |
| download | linux-stable-0a924578bc4a2823a95c151f56975c71f5c156bb.tar.gz linux-stable-0a924578bc4a2823a95c151f56975c71f5c156bb.tar.bz2 linux-stable-0a924578bc4a2823a95c151f56975c71f5c156bb.zip | |
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>
| -rw-r--r-- | drivers/net/ixgbe/ixgbe.h | 2 | ||||
| -rw-r--r-- | drivers/net/ixgbe/ixgbe_ethtool.c | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h index 1b12c7ba275f..e11d83d5852b 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 7ddb50c03f0d..79144e950a34 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; } |