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wifi: ath12k: Add drop descriptor handling for monitor ring

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When monitor block in Hardware experiences internal backpressure, a ring
entry with the EMPTY_DESC reason is received in the monitor destination
ring descriptor. The cookie field for this corresponding entry is invalid.
Currently driver attempts to process this cookie resulting in invalid
buf_id warning logs flooding the console. To fix this, skip processing the
destination descriptor when the EMPTY_DESCRIPTOR bit is set to true in ring
descriptor, thereby avoiding the processing of junk cookies.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: P Praneesh <quic_ppranees@quicinc.com>
Link: https://patch.msgid.link/20241223060132.3506372-9-quic_ppranees@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
This commit is contained in:
P Praneesh 2024-12-23 11:31:26 +05:30 committed by Jeff Johnson
parent 6788a66600
commit 51ad34a47e
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/ath/ath12k/dp_mon.c
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@ -2347,6 +2347,14 @@ int ath12k_dp_mon_srng_process(struct ath12k *ar, int *budget,
if (unlikely(!mon_dst_desc))
break;
/* In case of empty descriptor, the cookie in the ring descriptor
* is invalid. Therefore, this entry is skipped, and ring processing
* continues.
*/
info0 = le32_to_cpu(mon_dst_desc->info0);
if (u32_get_bits(info0, HAL_MON_DEST_INFO0_EMPTY_DESC))
goto move_next;
cookie = le32_to_cpu(mon_dst_desc->cookie);
buf_id = u32_get_bits(cookie, DP_RXDMA_BUF_COOKIE_BUF_ID);