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>
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2 changed files with 6 additions and 1 deletions
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@ -96,6 +96,8 @@
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#define IXGBE_TX_FLAGS_VLAN_PRIO_MASK 0x0000e000
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#define IXGBE_TX_FLAGS_VLAN_PRIO_MASK 0x0000e000
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#define IXGBE_TX_FLAGS_VLAN_SHIFT 16
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#define IXGBE_TX_FLAGS_VLAN_SHIFT 16
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#define IXGBE_MAX_RSC_INT_RATE 162760
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/* wrapper around a pointer to a socket buffer,
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/* wrapper around a pointer to a socket buffer,
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* so a DMA handle can be stored along with the buffer */
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* so a DMA handle can be stored along with the buffer */
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struct ixgbe_tx_buffer {
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struct ixgbe_tx_buffer {
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@ -1975,7 +1975,10 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
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* any other value means disable eitr, which is best
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* any other value means disable eitr, which is best
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* served by setting the interrupt rate very high
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* served by setting the interrupt rate very high
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*/
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*/
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adapter->eitr_param = IXGBE_MAX_INT_RATE;
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if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED)
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adapter->eitr_param = IXGBE_MAX_RSC_INT_RATE;
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else
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adapter->eitr_param = IXGBE_MAX_INT_RATE;
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adapter->itr_setting = 0;
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adapter->itr_setting = 0;
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}
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}
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