Perform dma_sync_single_for_cpu() on monitor ring rx buffer before
reading BUFFER_DONE tag and do dma_unmap_single() only after device
had set BUFFER_DONE tag to the buffer.
Also when BUFFER_DONE tag is not set, allow the buffer to get read
next time without freeing skb.
This helps to fix AP+Monitor VAP with flood traffic scenario to see
monitor ring rx buffer overrun missing BUFFER_DONE tag to be set.
Also remove redundant rx dma buf free performed on DP
rx_mon_status_refill_ring.
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
Signed-off-by: Sathishkumar Muruganandam <[email protected]>
Signed-off-by: Harshitha Prem <[email protected]>
---
drivers/net/wireless/ath/ath11k/dp_rx.c | 56 ++++++++++---------------
1 file changed, 23 insertions(+), 33 deletions(-)
diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index b65a84a88264..1d0739866a71 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -435,7 +435,6 @@ int ath11k_dp_rxbufs_replenish(struct ath11k_base *ab, int mac_id,
static int ath11k_dp_rxdma_buf_ring_free(struct ath11k *ar,
struct dp_rxdma_ring *rx_ring)
{
- struct ath11k_pdev_dp *dp = &ar->dp;
struct sk_buff *skb;
int buf_id;
@@ -453,28 +452,6 @@ static int ath11k_dp_rxdma_buf_ring_free(struct ath11k *ar,
idr_destroy(&rx_ring->bufs_idr);
spin_unlock_bh(&rx_ring->idr_lock);
- /* if rxdma1_enable is false, mon_status_refill_ring
- * isn't setup, so don't clean.
- */
- if (!ar->ab->hw_params.rxdma1_enable)
- return 0;
-
- rx_ring = &dp->rx_mon_status_refill_ring[0];
-
- spin_lock_bh(&rx_ring->idr_lock);
- idr_for_each_entry(&rx_ring->bufs_idr, skb, buf_id) {
- idr_remove(&rx_ring->bufs_idr, buf_id);
- /* XXX: Understand where internal driver does this dma_unmap
- * of rxdma_buffer.
- */
- dma_unmap_single(ar->ab->dev, ATH11K_SKB_RXCB(skb)->paddr,
- skb->len + skb_tailroom(skb), DMA_BIDIRECTIONAL);
- dev_kfree_skb_any(skb);
- }
-
- idr_destroy(&rx_ring->bufs_idr);
- spin_unlock_bh(&rx_ring->idr_lock);
-
return 0;
}
@@ -3029,39 +3006,52 @@ static int ath11k_dp_rx_reap_mon_status_ring(struct ath11k_base *ab, int mac_id,
spin_lock_bh(&rx_ring->idr_lock);
skb = idr_find(&rx_ring->bufs_idr, buf_id);
+ spin_unlock_bh(&rx_ring->idr_lock);
+
if (!skb) {
ath11k_warn(ab, "rx monitor status with invalid buf_id %d\n",
buf_id);
- spin_unlock_bh(&rx_ring->idr_lock);
pmon->buf_state = DP_MON_STATUS_REPLINISH;
goto move_next;
}
- idr_remove(&rx_ring->bufs_idr, buf_id);
- spin_unlock_bh(&rx_ring->idr_lock);
rxcb = ATH11K_SKB_RXCB(skb);
- dma_unmap_single(ab->dev, rxcb->paddr,
- skb->len + skb_tailroom(skb),
- DMA_FROM_DEVICE);
+ dma_sync_single_for_cpu(ab->dev, rxcb->paddr,
+ skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
tlv = (struct hal_tlv_hdr *)skb->data;
if (FIELD_GET(HAL_TLV_HDR_TAG, tlv->tl) !=
HAL_RX_STATUS_BUFFER_DONE) {
- ath11k_warn(ab, "mon status DONE not set %lx\n",
+ ath11k_warn(ab, "mon status DONE not set %lx, buf_id %d\n",
FIELD_GET(HAL_TLV_HDR_TAG,
- tlv->tl));
- dev_kfree_skb_any(skb);
+ tlv->tl), buf_id);
+ /* If done status is missing, hold onto status
+ * ring until status is done for this status
+ * ring buffer.
+ * Keep HP in mon_status_ring unchanged,
+ * and break from here.
+ * Check status for same buffer for next time
+ */
pmon->buf_state = DP_MON_STATUS_NO_DMA;
- goto move_next;
+ break;
}
+ spin_lock_bh(&rx_ring->idr_lock);
+ idr_remove(&rx_ring->bufs_idr, buf_id);
+ spin_unlock_bh(&rx_ring->idr_lock);
if (ab->hw_params.full_monitor_mode) {
ath11k_dp_rx_mon_update_status_buf_state(pmon, tlv);
if (paddr == pmon->mon_status_paddr)
pmon->buf_state = DP_MON_STATUS_MATCH;
}
+
+ dma_unmap_single(ab->dev, rxcb->paddr,
+ skb->len + skb_tailroom(skb),
+ DMA_FROM_DEVICE);
+
__skb_queue_tail(skb_list, skb);
} else {
pmon->buf_state = DP_MON_STATUS_REPLINISH;
--
2.17.1
Harshitha Prem <[email protected]> wrote:
> Perform dma_sync_single_for_cpu() on monitor ring rx buffer before
> reading BUFFER_DONE tag and do dma_unmap_single() only after device
> had set BUFFER_DONE tag to the buffer.
>
> Also when BUFFER_DONE tag is not set, allow the buffer to get read
> next time without freeing skb.
>
> This helps to fix AP+Monitor VAP with flood traffic scenario to see
> monitor ring rx buffer overrun missing BUFFER_DONE tag to be set.
>
> Also remove redundant rx dma buf free performed on DP
> rx_mon_status_refill_ring.
>
> Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
>
> Signed-off-by: Sathishkumar Muruganandam <[email protected]>
> Signed-off-by: Harshitha Prem <[email protected]>
> Signed-off-by: Kalle Valo <[email protected]>
Patch applied to ath-next branch of ath.git, thanks.
68e93ac5a31d wifi: ath11k: fix BUFFER_DONE read on monitor ring rx buffer
--
https://patchwork.kernel.org/project/linux-wireless/patch/[email protected]/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches