netdev - Re: [PATCH net-next 09/12] ionic: add and enable tx and rx timestamp handling

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Message-ID: <6e0e4d73-f436-21c0-59fe-ee4f5c133f95@pensando.io>
Date:   Mon, 5 Apr 2021 09:28:44 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        drivers@...sando.io, Allen Hubbe <allenbh@...sando.io>
Subject: Re: [PATCH net-next 09/12] ionic: add and enable tx and rx timestamp
 handling

On 4/4/21 4:41 PM, Richard Cochran wrote:
> On Thu, Apr 01, 2021 at 10:56:07AM -0700, Shannon Nelson wrote:
>
>> @@ -1150,6 +1232,10 @@ netdev_tx_t ionic_start_xmit(struct sk_buff *skb, struct net_device *netdev)
>>   		return NETDEV_TX_OK;
>>   	}
>>   
>> +	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
>> +		if (lif->hwstamp_txq)
>> +			return ionic_start_hwstamp_xmit(skb, netdev);
> The check for SKBTX_HW_TSTAMP and hwstamp_txq is good, but I didn't
> see hwstamp_txq getting cleared in ionic_lif_hwstamp_set() when the
> user turns off Tx time stamping via the SIOCSHWTSTAMP ioctl.

Once the hwstamp queues are up, we leave them there for future use until 
the interface is stopped, assuming that the stack isn't going to send us 
SKBTX_HW_STAMP after it has disabled the offload.

>
> In addition, the code should set
>
> 	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
>
> once the above tests pass.

I can add that in a followup patch.

Thanks,
sln

>
> Thanks,
> Richard
>
>