| Message ID | 20231129020414.56425-4-quic_bqiang@quicinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | wifi: ath12k: some improvement to RX throughput | expand |
On 11/28/2023 6:04 PM, Baochen Qiang wrote: > For WCN7850, there is a SRNG named MAC buffer ring, i.e., > dp->rx_mac_buf_ring. During initialization, it is setup > by host and then under control of firmware. During RX > process, firmware fetches buffers from > dp->rx_refill_buf_ring to fill that MAC buffer ring, > and those buffers are taken by RXDMA to carry real WLAN > frames received from air. > > Currently a low RX throughput is observed. Checking > firmware log, lots of errors are reported by MAC buffer > ring, complaining that it is running out of buffers, > which further indicates that RXDMA is suffering from > starvation. Currently the size of dp->rx_mac_buf_ring > is configured as 1024. After changing it to 2048, those > error messages are reduced, and a 6.4% increase is seen > in peak throughput. Note that 2048 is an empirical > value. It is chosen here because the RX throughput > meets our expectation after the change. > > This change only applies to WCN7850 since other > chips don't have a MAC buffer ring. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com> Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
diff --git a/drivers/net/wireless/ath/ath12k/dp.h b/drivers/net/wireless/ath/ath12k/dp.h index 50db1403ebce..ce55cb550379 100644 --- a/drivers/net/wireless/ath/ath12k/dp.h +++ b/drivers/net/wireless/ath/ath12k/dp.h @@ -165,6 +165,7 @@ struct ath12k_pdev_dp { #define DP_REO_CMD_RING_SIZE 128 #define DP_REO_STATUS_RING_SIZE 2048 #define DP_RXDMA_BUF_RING_SIZE 4096 +#define DP_RX_MAC_BUF_RING_SIZE 2048 #define DP_RXDMA_REFILL_RING_SIZE 2048 #define DP_RXDMA_ERR_DST_RING_SIZE 1024 #define DP_RXDMA_MON_STATUS_RING_SIZE 1024 diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index 9f831e3971f9..f6fbe867bbd4 100644 --- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -4110,7 +4110,7 @@ int ath12k_dp_rx_alloc(struct ath12k_base *ab) ret = ath12k_dp_srng_setup(ab, &dp->rx_mac_buf_ring[i], HAL_RXDMA_BUF, 1, - i, 1024); + i, DP_RX_MAC_BUF_RING_SIZE); if (ret) { ath12k_warn(ab, "failed to setup rx_mac_buf_ring %d\n", i);
For WCN7850, there is a SRNG named MAC buffer ring, i.e., dp->rx_mac_buf_ring. During initialization, it is setup by host and then under control of firmware. During RX process, firmware fetches buffers from dp->rx_refill_buf_ring to fill that MAC buffer ring, and those buffers are taken by RXDMA to carry real WLAN frames received from air. Currently a low RX throughput is observed. Checking firmware log, lots of errors are reported by MAC buffer ring, complaining that it is running out of buffers, which further indicates that RXDMA is suffering from starvation. Currently the size of dp->rx_mac_buf_ring is configured as 1024. After changing it to 2048, those error messages are reduced, and a 6.4% increase is seen in peak throughput. Note that 2048 is an empirical value. It is chosen here because the RX throughput meets our expectation after the change. This change only applies to WCN7850 since other chips don't have a MAC buffer ring. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com> --- v2: no change. drivers/net/wireless/ath/ath12k/dp.h | 1 + drivers/net/wireless/ath/ath12k/dp_rx.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-)