ath10k: disable TX complete indication of htt for sdio

For sdio chip, it is high latency bus, all the TX packet's content will
be tranferred from HOST memory to firmware memory via sdio bus, then it
need much more memory in firmware than low latency bus chip, for low
latency chip, such as PCI-E, it only need to transfer the TX descriptor
via PCI-E bus to firmware memory. For sdio chip, reduce the complexity of
TX logic will help TX efficiency since its memory is limited, and it will
reduce the TX circle's time of each packet and then firmware will have more
memory for TX since TX complete also need memeory.

This patch disable TX complete indication from firmware for htt data
packet, it will not have TX complete indication from firmware to ath10k.
It will cut the cost of bus bandwidth of TX complete and make the TX
logic of firmware simpler, it results in significant performance
improvement on TX path.

Udp TX throughout is 130Mbps without this patch, and it arrives
400Mbps with this patch.

The downside of this patch is the command "iw wlan0 station dump" will
show 0 for "tx retries" and "tx failed" since all tx packet's status
is success.

This patch only effect sdio chip, it will not effect PCI, SNOC etc.

Tested with QCA6174 SDIO with firmware
WLAN.RMH.4.4.1-00017-QCARMSWPZ-1

Signed-off-by: Wen Gong <wgong@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200212080415.31265-2-wgong@codeaurora.org

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index 1f709b65c29b..5a0db342e5ad 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -1752,6 +1752,28 @@ static int ath10k_sdio_hif_swap_mailbox(struct ath10k *ar)
 	return 0;
 }
 
+static int ath10k_sdio_get_htt_tx_complete(struct ath10k *ar)
+{
+	u32 addr, val;
+	int ret;
+
+	addr = host_interest_item_address(HI_ITEM(hi_acs_flags));
+
+	ret = ath10k_sdio_hif_diag_read32(ar, addr, &val);
+	if (ret) {
+		ath10k_warn(ar,
+			    "unable to read hi_acs_flags for htt tx comple : %d\n", ret);
+		return ret;
+	}
+
+	ret = (val & HI_ACS_FLAGS_SDIO_REDUCE_TX_COMPL_FW_ACK);
+
+	ath10k_dbg(ar, ATH10K_DBG_SDIO, "sdio reduce tx complete fw%sack\n",
+		   ret ? " " : " not ");
+
+	return ret;
+}
+
 /* HIF start/stop */
 
 static int ath10k_sdio_hif_start(struct ath10k *ar)
@@ -2026,6 +2048,7 @@ static const struct ath10k_hif_ops ath10k_sdio_hif_ops = {
 	.start			= ath10k_sdio_hif_start,
 	.stop			= ath10k_sdio_hif_stop,
 	.swap_mailbox		= ath10k_sdio_hif_swap_mailbox,
+	.get_htt_tx_complete	= ath10k_sdio_get_htt_tx_complete,
 	.map_service_to_pipe	= ath10k_sdio_hif_map_service_to_pipe,
 	.get_default_pipe	= ath10k_sdio_hif_get_default_pipe,
 	.send_complete_check	= ath10k_sdio_hif_send_complete_check,