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i40e/i40evf: fix Tx hang workaround code 

The arm writeback (arm_wb) code is used for kicking the Tx ring to
make sure any pending work is completed even if interrupts are
disabled. It was running when it didn't need to, and not clearing
the ring->arm_wb state after it was set.  This caused Tx hangs
to still occur occasionally when there really was no hang.
Fix this by resetting the variable right after it was used.

Change-ID: I7bf75d552ba9c4bd203d40615213861a24bb5594
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@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:
Jesse Brandeburg 2015-07-23 16:54:34 -04:00 committed by Jeff Kirsher
parent 17351401fe
commit 0deda86836
2 changed files with 2 additions and 2 deletions
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1
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -1842,6 +1842,7 @@ int i40e_napi_poll(struct napi_struct *napi, int budget)
i40e_for_each_ring(ring, q_vector->tx) {
clean_complete &= i40e_clean_tx_irq(ring, vsi->work_limit);
arm_wb |= ring->arm_wb;
ring->arm_wb = false;
}
/* We attempt to distribute budget to each Rx queue fairly, but don't

3
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
View File

@ -254,8 +254,6 @@ static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget)
!test_bit(__I40E_DOWN, &tx_ring->vsi->state) &&
(I40E_DESC_UNUSED(tx_ring) != tx_ring->count))
tx_ring->arm_wb = true;
else
tx_ring->arm_wb = false;
netdev_tx_completed_queue(netdev_get_tx_queue(tx_ring->netdev,
tx_ring->queue_index),
@ -1288,6 +1286,7 @@ int i40evf_napi_poll(struct napi_struct *napi, int budget)
i40e_for_each_ring(ring, q_vector->tx) {
clean_complete &= i40e_clean_tx_irq(ring, vsi->work_limit);
arm_wb |= ring->arm_wb;
ring->arm_wb = false;
}
/* We attempt to distribute budget to each Rx queue fairly, but don't