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fm10k: fix SM mailbox full condition 

Current condition will always incorrectly report a full SM mailbox if an
IES API application is not running. Due to this, the
"fm10k_service_task" will be infinitely queued into the driver's
workqueue. This, in turn, will cause a "kworker" thread to report 100%
CPU utilization and might cause "soft lockup" events or system crashes.

To fix this issue, a new condition is added to determine if the SM
mailbox is in the correct state of FM10K_STATE_OPEN before proceeding.
In other words, an instance of the IES API must be running. If there is,
the remainder of the flow stays the same which is to determine if the SM
mailbox capacity has been exceeded or not and take appropriate action.

Signed-off-by: Ngai-Mint Kwan <ngai-mint.kwan@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Ngai-Mint Kwan 2018-10-15 12:18:27 -07:00 committed by Jeff Kirsher
parent 094bf4d0e9
commit e69e40c806
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/intel/fm10k/fm10k_iov.c
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@ -244,7 +244,8 @@ process_mbx:
}
/* guarantee we have free space in the SM mailbox */
if (!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU)) {
if (hw->mbx.state == FM10K_STATE_OPEN &&
!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU)) {
/* keep track of how many times this occurs */
interface->hw_sm_mbx_full++;