From 9a1a69adad69ce4e85c9cbb40a3f960a7cb015cf Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Fri, 13 Mar 2009 22:14:10 +0000 Subject: [PATCH] ixgbe: Fix the Tx clean logic to return proper status The Tx accounting when cleaning during NAPI was not completely properly. We should use the work_limit to determine when to finish cleaning, and use the same to return the cleaned status. The impact of running like this causes the NAPI clean for this Tx to get stuck in a scheduling loop, and can result in Tx not getting cleaned, ending with a Tx hang and device reset. Signed-off-by: Jesse Brandeburg Signed-off-by: Peter P Waskiewicz Jr Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/ixgbe/ixgbe_main.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index cd215200b0e6..d5563e4d3b3b 100644 --- a/drivers/net/ixgbe/ixgbe_main.c +++ b/drivers/net/ixgbe/ixgbe_main.c @@ -251,6 +251,8 @@ static void ixgbe_tx_timeout(struct net_device *netdev); * ixgbe_clean_tx_irq - Reclaim resources after transmit completes * @adapter: board private structure * @tx_ring: tx ring to clean + * + * returns true if transmit work is done **/ static bool ixgbe_clean_tx_irq(struct ixgbe_adapter *adapter, struct ixgbe_ring *tx_ring) @@ -266,7 +268,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_adapter *adapter, eop_desc = IXGBE_TX_DESC_ADV(*tx_ring, eop); while ((eop_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)) && - (count < tx_ring->count)) { + (count < tx_ring->work_limit)) { bool cleaned = false; for ( ; !cleaned; count++) { struct sk_buff *skb; @@ -328,8 +330,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_adapter *adapter, } /* re-arm the interrupt */ - if ((total_packets >= tx_ring->work_limit) || - (count == tx_ring->count)) + if (count >= tx_ring->work_limit) IXGBE_WRITE_REG(&adapter->hw, IXGBE_EICS, tx_ring->v_idx); tx_ring->total_bytes += total_bytes; @@ -338,7 +339,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_adapter *adapter, tx_ring->stats.bytes += total_bytes; adapter->net_stats.tx_bytes += total_bytes; adapter->net_stats.tx_packets += total_packets; - return (total_packets ? true : false); + return (count < tx_ring->work_limit); } #ifdef CONFIG_IXGBE_DCA @@ -2590,10 +2591,10 @@ void ixgbe_down(struct ixgbe_adapter *adapter) **/ static int ixgbe_poll(struct napi_struct *napi, int budget) { - struct ixgbe_q_vector *q_vector = container_of(napi, - struct ixgbe_q_vector, napi); + struct ixgbe_q_vector *q_vector = + container_of(napi, struct ixgbe_q_vector, napi); struct ixgbe_adapter *adapter = q_vector->adapter; - int tx_cleaned, work_done = 0; + int tx_clean_complete, work_done = 0; #ifdef CONFIG_IXGBE_DCA if (adapter->flags & IXGBE_FLAG_DCA_ENABLED) { @@ -2602,10 +2603,10 @@ static int ixgbe_poll(struct napi_struct *napi, int budget) } #endif - tx_cleaned = ixgbe_clean_tx_irq(adapter, adapter->tx_ring); + tx_clean_complete = ixgbe_clean_tx_irq(adapter, adapter->tx_ring); ixgbe_clean_rx_irq(q_vector, adapter->rx_ring, &work_done, budget); - if (tx_cleaned) + if (!tx_clean_complete) work_done = budget; /* If budget not fully consumed, exit the polling mode */ -- 2.30.2