On Tue, Aug 27, 2019 at 7:02 PM Wen Gong <wgong@xxxxxxxxxxxxxx> wrote:
>
> The default credit size is 1792 bytes, but the IP mtu is 1500 bytes,
> then it has about 290 bytes's waste for each data packet on sdio
> transfer path for TX bundle, it will reduce the transmission utilization
> ratio for data packet.
>
> This patch enable the small credit size in firmware, firmware will use
> the new credit size 1556 bytes, it will increase the transmission
> utilization ratio for data packet on TX patch. It results in significant
> performance improvement on TX path.
>
> 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-QCARMSWP-1.
>
> Signed-off-by: Wen Gong <wgong@xxxxxxxxxxxxxx>
> ---
> drivers/net/wireless/ath/ath10k/core.c | 16 ++++++++++++++++
> drivers/net/wireless/ath/ath10k/htc.c | 11 +++++++++--
> drivers/net/wireless/ath/ath10k/htc.h | 11 +++++++++--
> 3 files changed, 34 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
> index 351f4ed..7593d19 100644
> --- a/drivers/net/wireless/ath/ath10k/core.c
> +++ b/drivers/net/wireless/ath/ath10k/core.c
> @@ -31,6 +31,7 @@
> static unsigned int ath10k_cryptmode_param;
> static bool uart_print;
> static bool disable_tx_comp = true;
> +static bool alt_data = true;
> static bool skip_otp;
> static bool rawmode;
> static bool fw_diag_log;
> @@ -45,6 +46,15 @@
>
> /* If upper layer need the TX complete status, it can enable tx complete */
> module_param(disable_tx_comp, bool, 0644);
> +
> +/* alt_data is only used for sdio chip, for previous version of firmware, its
> + * alt data size is 1544 which is not enough for native wifi, so it need to
> + * alt_data for the firmware.
> + * If the firmware has changed alt data size to 1556, then it can enable
> + * alt_data for the firmware.
> + * alt_data will not effect PCI, SNOC etc.
> + */
> +module_param(alt_data, bool, 0644);
> module_param(skip_otp, bool, 0644);
> module_param(rawmode, bool, 0644);
> module_param(fw_diag_log, bool, 0644);
> @@ -701,6 +711,12 @@ static void ath10k_init_sdio(struct ath10k *ar, enum ath10k_firmware_mode mode)
> */
> param &= ~HI_ACS_FLAGS_ALT_DATA_CREDIT_SIZE;
>
> + /* If alternate credit size of 1556 as used by SDIO firmware is
> + * big enough for mac80211 / native wifi frames. enable it
> + */
> + if (alt_data && mode == ATH10K_FIRMWARE_MODE_NORMAL)
> + param |= HI_ACS_FLAGS_ALT_DATA_CREDIT_SIZE;
else
param &= ~HI_ACS_FLAGS_ALT_DATA_CREDIT_SIZE;
(and remove the mask above)
> +
> if (mode == ATH10K_FIRMWARE_MODE_UTF)
> param &= ~HI_ACS_FLAGS_SDIO_SWAP_MAILBOX_SET;
> else
> diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c
> index e0eb5f0..5cacab6 100644
> --- a/drivers/net/wireless/ath/ath10k/htc.c
> +++ b/drivers/net/wireless/ath/ath10k/htc.c
> @@ -938,12 +938,15 @@ int ath10k_htc_wait_target(struct ath10k_htc *htc)
> */
> if (htc->control_resp_len >=
> sizeof(msg->hdr) + sizeof(msg->ready_ext)) {
> + htc->alt_data_credit_size =
> + __le16_to_cpu(msg->ready_ext.reserved) & 0x0fff;
Please define 0x0fff as a macro.
> htc->max_msgs_per_htc_bundle =
> min_t(u8, msg->ready_ext.max_msgs_per_htc_bundle,
> HTC_HOST_MAX_MSG_PER_RX_BUNDLE);
> ath10k_dbg(ar, ATH10K_DBG_HTC,
> - "Extended ready message. RX bundle size: %d\n",
> - htc->max_msgs_per_htc_bundle);
> + "Extended ready message. RX bundle size: %d, alt size:%d\n",
> + htc->max_msgs_per_htc_bundle,
> + htc->alt_data_credit_size);
> }
>
> INIT_WORK(&ar->bundle_tx_work, ath10k_htc_bundle_tx_work);
> @@ -1095,6 +1098,10 @@ int ath10k_htc_connect_service(struct ath10k_htc *htc,
> ep->tx_credits = tx_alloc;
> ep->tx_credit_size = htc->target_credit_size;
>
> + if (conn_req->service_id == ATH10K_HTC_SVC_ID_HTT_DATA_MSG &&
> + htc->alt_data_credit_size != 0)
> + ep->tx_credit_size = htc->alt_data_credit_size;
> +
> /* copy all the callbacks */
> ep->ep_ops = conn_req->ep_ops;
>
> diff --git a/drivers/net/wireless/ath/ath10k/htc.h b/drivers/net/wireless/ath/ath10k/htc.h
> index d805ea5..f0a9e60af 100644
> --- a/drivers/net/wireless/ath/ath10k/htc.h
> +++ b/drivers/net/wireless/ath/ath10k/htc.h
> @@ -139,8 +139,14 @@ struct ath10k_htc_ready_extended {
> struct ath10k_htc_ready base;
> u8 htc_version; /* @enum ath10k_htc_version */
> u8 max_msgs_per_htc_bundle;
> - u8 pad0;
> - u8 pad1;
> + union {
> + __le16 reserved;
> + struct {
> + u8 pad0;
> + u8 pad1;
> + } __packed;
> + } __packed;
> +
> } __packed;
>
> struct ath10k_htc_conn_svc {
> @@ -377,6 +383,7 @@ struct ath10k_htc {
> int total_transmit_credits;
> int target_credit_size;
> u8 max_msgs_per_htc_bundle;
> + int alt_data_credit_size;
> };
>
> int ath10k_htc_init(struct ath10k *ar);
> --
> 1.9.1
>
