From: Brett Creeley brett.creeley@intel.com
[ Upstream commit 809f23c0423a43266e47a7dc67e95b5cb4d1cbfc ]
The underlying hardware may or may not allow reading of the head or tail registers and it really makes no difference if we use the software cached values. So, always used the software cached values.
Fixes: 9c6c12595b73 ("i40e: Detection and recovery of TX queue hung logic moved to service_task from tx_timeout") Signed-off-by: Brett Creeley brett.creeley@intel.com Co-developed-by: Norbert Zulinski norbertx.zulinski@intel.com Signed-off-by: Norbert Zulinski norbertx.zulinski@intel.com Signed-off-by: Mateusz Palczewski mateusz.palczewski@intel.com Tested-by: Konrad Jankowski konrad0.jankowski@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/iavf/iavf_txrx.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c index 99983f7a0ce0..8f6269e9f6a7 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c +++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c @@ -114,8 +114,11 @@ u32 iavf_get_tx_pending(struct iavf_ring *ring, bool in_sw) { u32 head, tail;
+ /* underlying hardware might not allow access and/or always return + * 0 for the head/tail registers so just use the cached values + */ head = ring->next_to_clean; - tail = readl(ring->tail); + tail = ring->next_to_use;
if (head != tail) return (head < tail) ?