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i40e/i40evf: Ignore a driver perceived Tx hang if the number of desc pending < 4

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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>
This commit is contained in:
Anjali Singhai Jain 2014-07-10 07:58:25 +00:00 committed by Jeff Kirsher
parent 30650cc552
commit 810b3ae42f
6 changed files with 19 additions and 3 deletions
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1
drivers/net/ethernet/intel/i40e/i40e.h
View File

@ -316,6 +316,7 @@ struct i40e_pf {
u32 tx_timeout_count;
u32 tx_timeout_recovery_level;
unsigned long tx_timeout_last_recovery;
u32 tx_sluggish_count;
u32 hw_csum_rx_error;
u32 led_status;
u16 corer_count; /* Core reset count */

3
drivers/net/ethernet/intel/i40e/i40e_debugfs.c
View File

@ -1356,6 +1356,9 @@ static ssize_t i40e_dbg_command_write(struct file *filp,
"emp reset count: %d\n", pf->empr_count);
dev_info(&pf->pdev->dev,
"pf reset count: %d\n", pf->pfr_count);
dev_info(&pf->pdev->dev,
"pf tx sluggish count: %d\n",
pf->tx_sluggish_count);
} else if (strncmp(&cmd_buf[5], "port", 4) == 0) {
struct i40e_aqc_query_port_ets_config_resp *bw_data;
struct i40e_dcbx_config *cfg =

10
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -607,6 +607,7 @@ static u32 i40e_get_tx_pending(struct i40e_ring *ring)
static bool i40e_check_tx_hang(struct i40e_ring *tx_ring)
{
u32 tx_pending = i40e_get_tx_pending(tx_ring);
struct i40e_pf *pf = tx_ring->vsi->back;
bool ret = false;
clear_check_for_tx_hang(tx_ring);
@ -623,10 +624,17 @@ 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 if ((tx_ring->tx_stats.tx_done_old == tx_ring->stats.packets) &&
(tx_pending < I40E_MIN_DESC_PENDING) &&
(tx_pending > 0)) {
if (I40E_DEBUG_FLOW & pf->hw.debug_mask)
dev_info(tx_ring->dev, "HW needs some more descs to do a cacheline flush. tx_pending %d, queue %d",
tx_pending, tx_ring->queue_index);
pf->tx_sluggish_count++;
} else {
/* update completed stats and disarm the hang check */
tx_ring->tx_stats.tx_done_old = tx_ring->stats.packets;

1
drivers/net/ethernet/intel/i40e/i40e_txrx.h
View File

@ -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)

6
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
View File

@ -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);

1
drivers/net/ethernet/intel/i40evf/i40e_txrx.h
View File

@ -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)