[PATCHv2] ath11k: Invalidate cached reo ring entry before accessing it

[PATCHv2] ath11k: Invalidate cached reo ring entry before accessing it

[Rameshkumar Sundaram]

REO2SW ring descriptor is currently allocated in cacheable memory.
While reaping reo ring entries on second trial after updating head
pointer, first entry is not invalidated before accessing it.

This results in host reaping and using cached descriptor which is
already overwritten in memory by DMA device (HW).
Since the contents of descriptor(buffer id, peer info and other information
bits) are outdated host throws errors like below while parsing corresponding
MSDU's and drops them.

[347712.048904] ath11k_pci 0004:01:00.0: msdu_done bit in attention is not set
[349173.355503] ath11k_pci 0004:01:00.0: frame rx with invalid buf_id 962

Move the try_again: label above  ath11k_hal_srng_access_begin()
so that first entry will be invalidated and prefetched.

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.5.0.1-01100-QCAHKSWPL_SILICONZ-1

Fixes: 6452f0a3d565 ("ath11k: allocate dst ring descriptors from cacheable memory")
Signed-off-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>

---
v2:
  - Updated commit log to describe the symptoms and the bug being fixed.
---
 drivers/net/wireless/ath/ath11k/dp_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index 89b77b94..99c7e8a 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -2652,9 +2652,9 @@ int ath11k_dp_process_rx(struct ath11k_base *ab, int ring_id,
 
 	spin_lock_bh(&srng->lock);
 
+try_again:
 	ath11k_hal_srng_access_begin(ab, srng);
 
-try_again:
 	while (likely(desc =
 	      (struct hal_reo_dest_ring *)ath11k_hal_srng_dst_get_next_entry(ab,
 									     srng))) {
-- 
2.7.4

Re: [PATCHv2] ath11k: Invalidate cached reo ring entry before accessing it

[Kalle Valo]

Rameshkumar Sundaram <quic_ramess@quicinc.com> wrote:

> REO2SW ring descriptor is currently allocated in cacheable memory.
> While reaping reo ring entries on second trial after updating head
> pointer, first entry is not invalidated before accessing it.
> 
> This results in host reaping and using cached descriptor which is
> already overwritten in memory by DMA device (HW).
> Since the contents of descriptor(buffer id, peer info and other information
> bits) are outdated host throws errors like below while parsing corresponding
> MSDU's and drops them.
> 
> [347712.048904] ath11k_pci 0004:01:00.0: msdu_done bit in attention is not set
> [349173.355503] ath11k_pci 0004:01:00.0: frame rx with invalid buf_id 962
> 
> Move the try_again: label above  ath11k_hal_srng_access_begin()
> so that first entry will be invalidated and prefetched.
> 
> Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.5.0.1-01100-QCAHKSWPL_SILICONZ-1
> 
> Fixes: 6452f0a3d565 ("ath11k: allocate dst ring descriptors from cacheable memory")
> Signed-off-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

Patch applied to ath-next branch of ath.git, thanks.

f2180ccb52b5 ath11k: Invalidate cached reo ring entry before accessing it

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/1645000354-32558-1-git-send-email-quic_ramess@quicinc.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches