Hello!
On 10/1/20 10:13 AM, Andrew Gabbasov wrote:
The patch was set to the "Changes Requested" state -- most probably because of this
mail. Though unintentionally, it served to throttle actions on this patch. I did only
remember about this patch yesterday... :-)
[...]
>> In the function ravb_hwtstamp_get() in ravb_main.c with the existing
> values
>> for RAVB_RXTSTAMP_TYPE_V2_L2_EVENT (0x2) and RAVB_RXTSTAMP_TYPE_ALL
>> (0x6)
>>
>> if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT)
>> config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
>> else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL)
>> config.rx_filter = HWTSTAMP_FILTER_ALL;
>>
>> if the test on RAVB_RXTSTAMP_TYPE_ALL should be true, it will never be
>> reached.
>>
>> This issue can be verified with 'hwtstamp_config' testing program
>> (tools/testing/selftests/net/hwtstamp_config.c). Setting filter type to
> ALL
>> and subsequent retrieving it gives incorrect value:
>>
>> $ hwtstamp_config eth0 OFF ALL
>> flags = 0
>> tx_type = OFF
>> rx_filter = ALL
>> $ hwtstamp_config eth0
>> flags = 0
>> tx_type = OFF
>> rx_filter = PTP_V2_L2_EVENT
>>
>> Correct this by converting if-else's to switch.
>
> Earlier you proposed to fix this issue by changing the value
> of RAVB_RXTSTAMP_TYPE_ALL constant to 0x4.
> Unfortunately, simple changing of the constant value will not
> be enough, since the code in ravb_rx() (actually determining
> if timestamp is needed)
>
> u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE;
> [...]
> get_ts &= (q == RAVB_NC) ?
> RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
> ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
>
> will work incorrectly and will need to be fixed too, making this
> piece of code more complicated.
>
> So, it's probably easier and safer to keep the constant value and
> the code in ravb_rx() intact, and just fix the get ioctl code,
> where the issue is actually located.
We have one more issue with the current driver: bit 2 of priv->tstamp_rx_ctrl
can only be set as a part of the ALL mask, not individually. I'm now thinking we
should set RAVB_RXTSTAMP_TYPE[_ALL] to 2 (and probably just drop the ALL mask)...
[...]
>> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
>> Reported-by: Julia Lawall <julia.lawall@xxxxxxxx>
>> Signed-off-by: Andrew Gabbasov <andrew_gabbasov@xxxxxxxxxx>
>> ---
>> drivers/net/ethernet/renesas/ravb_main.c | 10 +++++++---
>> 1 file changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c
>> b/drivers/net/ethernet/renesas/ravb_main.c
>> index df89d09b253e..c0610b2d3b14 100644
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>> @@ -1802,12 +1802,16 @@ static int ravb_hwtstamp_get(struct net_device
>> *ndev, struct ifreq *req)
>> config.flags = 0;
>> config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON :
>> HWTSTAMP_TX_OFF;
>> - if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT)
>> + switch (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE) {
>> + case RAVB_RXTSTAMP_TYPE_V2_L2_EVENT:
>> config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
>> - else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL)
>> + break;
>> + case RAVB_RXTSTAMP_TYPE_ALL:
>> config.rx_filter = HWTSTAMP_FILTER_ALL;
>> - else
>> + break;
>> + default:
>> config.rx_filter = HWTSTAMP_FILTER_NONE;
Yeah, that's better. But do we really need am anonymous bit 2 that can't be
toggled other than via passing the ALL mask?
[...]
MBR, Sergei
