[PATCH v3] ath10k: Fix the MTU size on QCA9377 SDIO

[Kalle Valo]

Fabio Estevam <festevam at denx.de> wrote:

> On an imx6dl-pico-pi board with a QCA9377 SDIO chip, simply trying to
> connect via ssh to another machine causes:
> 
> [   55.824159] ath10k_sdio mmc1:0001:1: failed to transmit packet, dropping: -12
> [   55.832169] ath10k_sdio mmc1:0001:1: failed to submit frame: -12
> [   55.838529] ath10k_sdio mmc1:0001:1: failed to push frame: -12
> [   55.905863] ath10k_sdio mmc1:0001:1: failed to transmit packet, dropping: -12
> [   55.913650] ath10k_sdio mmc1:0001:1: failed to submit frame: -12
> [   55.919887] ath10k_sdio mmc1:0001:1: failed to push frame: -12
> 
> , leading to an ssh connection failure.
> 
> One user inspected the size of frames on Wireshark and reported
> the followig:
> 
> "I was able to narrow the issue down to the mtu. If I set the mtu for
> the wlan0 device to 1486 instead of 1500, the issue does not happen.
> 
> The size of frames that I see on Wireshark is exactly 1500 after
> setting it to 1486."
> 
> Clearing the HI_ACS_FLAGS_ALT_DATA_CREDIT_SIZE avoids the problem and
> the ssh command works successfully after that.
> 
> Introduce a 'credit_size_workaround' field to ath10k_hw_params for
> the QCA9377 SDIO, so that the HI_ACS_FLAGS_ALT_DATA_CREDIT_SIZE
> is not set in this case.
> 
> Tested with QCA9377 SDIO with firmware WLAN.TF.1.1.1-00061-QCATFSWPZ-1.
> 
> Fixes: 2f918ea98606 ("ath10k: enable alt data of TX path for sdio")
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Signed-off-by: Kalle Valo <quic_kvalo at quicinc.com>

Patch applied to ath-next branch of ath.git, thanks.

09b8cd69edcf ath10k: Fix the MTU size on QCA9377 SDIO

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20211124131047.713756-1-festevam@denx.de/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches