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iavf: Fix cached head and tail value for iavf_get_tx_pending

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[ Upstream commit 809f23c042 ]

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: 9c6c12595b ("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>
This commit is contained in:
Brett Creeley
2022-09-01 16:34:40 +02:00
committed by Greg Kroah-Hartman
parent 5d75fef3e6
commit 14446a1bc2
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/intel/iavf/iavf_txrx.c
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@@ -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) ?