diff options
| author | Anjali Singhai Jain <anjali.singhai@intel.com> | 2014-07-10 07:58:25 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2014-08-27 01:11:00 -0700 |
| commit | 810b3ae42f5a6d1ddb17bb20eb69046de08ab1ef (patch) | |
| tree | 90d543634f2b5f9e675d97e02aa0f1428f3e343a /drivers/net/ethernet/intel/i40evf | |
| parent | 30650cc552cf9a60fa80a205693c6f76f7a00549 (diff) | |
i40e/i40evf: Ignore a driver perceived Tx hang if the number of desc pending < 4
We are seeing situations where the driver sees a hang with less than 4
desc pending, if the driver chooses to ignore it the queue progresses
forward and the stack never experiences a real hang.
With this patch we will log a stat when this situation happens
"tx_sluggish" will increment and we can see some more details
at a higher debug level. Other than that we will ignore this
particular case of Tx hang.
Change-ID: I7d1d1666d990e2b12f4f6bed0d17d22e1b6410d5
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/i40evf')
| -rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 6 | ||||
| -rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40e_txrx.h | 1 |
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index 79bf96ca6489..64b089151add 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -163,11 +163,13 @@ static bool i40e_check_tx_hang(struct i40e_ring *tx_ring) * pending but without time to complete it yet. */ if ((tx_ring->tx_stats.tx_done_old == tx_ring->stats.packets) && - tx_pending) { + (tx_pending >= I40E_MIN_DESC_PENDING)) { /* make sure it is true for two checks in a row */ ret = test_and_set_bit(__I40E_HANG_CHECK_ARMED, &tx_ring->state); - } else { + } else if (!(tx_ring->tx_stats.tx_done_old == tx_ring->stats.packets) || + !(tx_pending < I40E_MIN_DESC_PENDING) || + !(tx_pending > 0)) { /* update completed stats and disarm the hang check */ tx_ring->tx_stats.tx_done_old = tx_ring->stats.packets; clear_bit(__I40E_HANG_CHECK_ARMED, &tx_ring->state); diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h index 8bc6858163b0..f6dcf9dd9290 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h @@ -121,6 +121,7 @@ enum i40e_dyn_idx_t { /* Tx Descriptors needed, worst case */ #define TXD_USE_COUNT(S) DIV_ROUND_UP((S), I40E_MAX_DATA_PER_TXD) #define DESC_NEEDED (MAX_SKB_FRAGS + 4) +#define I40E_MIN_DESC_PENDING 4 #define I40E_TX_FLAGS_CSUM (u32)(1) #define I40E_TX_FLAGS_HW_VLAN (u32)(1 << 1) |