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i40e: Error handling for link event 

There exists an intermittent bug which causes the 'Link Detected'
field reported by the 'ethtool <iface>' command to be 'Yes' when
in fact, there is no link. This patch fixes the problem by
enabling temporary link polling when i40e_get_link_status returns
an error. This causes the driver to remember that an admin queue
command failed and polls, until the function returns with a success.

Change-Id: I64c69b008db4017b8729f3fc27b8f65c8fe2eaa0
Signed-off-by: Harshitha Ramamurthy <harshitha.ramamurthy@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Harshitha Ramamurthy 2016-12-12 15:44:16 -08:00 committed by Jeff Kirsher
parent 5cb259016b
commit ae13670824
2 changed files with 13 additions and 2 deletions
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1
drivers/net/ethernet/intel/i40e/i40e.h
View File

@ -349,6 +349,7 @@ struct i40e_pf {
#define I40E_FLAG_HAVE_CRT_RETIMER BIT_ULL(52)
#define I40E_FLAG_PTP_L4_CAPABLE BIT_ULL(53)
#define I40E_FLAG_WOL_MC_MAGIC_PKT_WAKE BIT_ULL(54)
#define I40E_FLAG_TEMP_LINK_POLLING BIT_ULL(55)
/* tracks features that get auto disabled by errors */
u64 auto_disable_flags;

14
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -6353,7 +6353,16 @@ static void i40e_link_event(struct i40e_pf *pf)
old_link = (pf->hw.phy.link_info_old.link_info & I40E_AQ_LINK_UP);
status = i40e_get_link_status(&pf->hw, &new_link);
if (status) {
/* On success, disable temp link polling */
if (status == I40E_SUCCESS) {
if (pf->flags & I40E_FLAG_TEMP_LINK_POLLING)
pf->flags &= ~I40E_FLAG_TEMP_LINK_POLLING;
} else {
/* Enable link polling temporarily until i40e_get_link_status
* returns I40E_SUCCESS
*/
pf->flags |= I40E_FLAG_TEMP_LINK_POLLING;
dev_dbg(&pf->pdev->dev, "couldn't get link state, status: %d\n",
status);
return;
@ -6405,7 +6414,8 @@ static void i40e_watchdog_subtask(struct i40e_pf *pf)
return;
pf->service_timer_previous = jiffies;
if (pf->flags & I40E_FLAG_LINK_POLLING_ENABLED)
if ((pf->flags & I40E_FLAG_LINK_POLLING_ENABLED) ||
(pf->flags & I40E_FLAG_TEMP_LINK_POLLING))
i40e_link_event(pf);
/* Update the stats for active netdevs so the network stack