From 151b260c624d47b2c78b2f887e4f791c09c73c17 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Sat, 15 Mar 2014 14:55:21 +0000 Subject: [PATCH] ixgbe: fix race conditions on queuing skb for HW time stamp ixgbe has a single set of TX time stamping resources per NIC. Use a simple bit lock to avoid race conditions and leaking skbs when multiple TX rings try to claim time stamping. Signed-off-by: Jakub Kicinski Tested-by: Phil Schmitt Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe.h | 1 + drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 4 +++- drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c | 3 +++ 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h index 2fff0fc4e6e8..26d27aae9793 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h @@ -812,6 +812,7 @@ enum ixgbe_state_t { __IXGBE_SERVICE_SCHED, __IXGBE_IN_SFP_INIT, __IXGBE_PTP_RUNNING, + __IXGBE_PTP_TX_IN_PROGRESS, }; struct ixgbe_cb { diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 24538cb0f856..c4b930c0ce7f 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -7042,7 +7042,9 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb, tx_flags |= IXGBE_TX_FLAGS_SW_VLAN; } - if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) { + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP && + !test_and_set_bit_lock(__IXGBE_PTP_TX_IN_PROGRESS, + &adapter->state))) { skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; tx_flags |= IXGBE_TX_FLAGS_TSTAMP; diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c index 8b527d79d429..63515a6f67fa 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c @@ -493,6 +493,7 @@ static void ixgbe_ptp_tx_hwtstamp(struct ixgbe_adapter *adapter) dev_kfree_skb_any(adapter->ptp_tx_skb); adapter->ptp_tx_skb = NULL; + clear_bit_unlock(__IXGBE_PTP_TX_IN_PROGRESS, &adapter->state); } /** @@ -515,6 +516,7 @@ static void ixgbe_ptp_tx_hwtstamp_work(struct work_struct *work) if (timeout) { dev_kfree_skb_any(adapter->ptp_tx_skb); adapter->ptp_tx_skb = NULL; + clear_bit_unlock(__IXGBE_PTP_TX_IN_PROGRESS, &adapter->state); e_warn(drv, "clearing Tx Timestamp hang"); return; } @@ -925,6 +927,7 @@ void ixgbe_ptp_stop(struct ixgbe_adapter *adapter) if (adapter->ptp_tx_skb) { dev_kfree_skb_any(adapter->ptp_tx_skb); adapter->ptp_tx_skb = NULL; + clear_bit_unlock(__IXGBE_PTP_TX_IN_PROGRESS, &adapter->state); } if (adapter->ptp_clock) { -- 2.39.5