Hello Carolyn:
I'm sure that the timestamp is appearing on a packet outside the
transmitting system, when PHY timestamping the packet, the tsbits is
asserted, driver should check it in the interrupt routine, the timestamp of
outside packet should be pushed in the TXSTMPL & TXSTMPH registers(lower &
upper).
The description information of bit0 in the TSYNCTXCTL register could
be found in 82574gbe datasheet, 10.2.9.8 on page 369:
" TXTT -- Tx time stamp valid. Equals 1b when a valid value
for Tx timestamp is captured in the Tx time stamp register. Cleared by read
of Tx time stamp register TXSTMPH."
Thanks for your respondence
>
>Hello,
>
>I've briefly reviewed your code. When you check for the tsbits in the
transmitted packet, are you checking from a network sniffer, on the wire,
or from a system receiving the transmitted packets? I am not sure that the
bits can >be read from the driver on the system doing the transmit. It
would be more accurate to check the packet on the wire or received on
another system, similar to checksum.
>
>I will continue reviewing your code. Please confirm if you the timestamp
is appearing on a packet outside the transmitting system.
>
>Thanks,
>
>Carolyn
>
-----邮件原件-----
发件人: Wyborny, Carolyn [mailto:[email protected]]
发送时间: 2010年10月9日 1:41
收件人: 李昂; [email protected]
抄送: 王龙; 和志华
主题: RE: [E1000-devel] question about TX hardware timestamping, it doesn't
work
>-----Original Message-----
>From: 李昂 [mailto:[email protected]]
>Sent: Tuesday, September 28, 2010 11:20 PM
>To: Wyborny, Carolyn; [email protected]
>Cc: 王龙; 和志华
>Subject: re: [E1000-devel] question about TX hardware
>timestamping, it doesn't work
>
>Hey Carolyn:
>
> thanks for your respondence, the attachment is the
>package of e1000e
>driver(I have modified netdev.c), searching "li.ang" in the
>netdev.c file,
>you will find modification, it including initialization code &
>registers I'm
>writing to enable the hwtstamp feature.
>
>
>
>----- Original Message -----
>From: Wyborny, Carolyn [mailto:[email protected]]
>Sent: 2010年9月28日 1:35
>To:??; [email protected]
>Cc: ??; ???
>Subject: RE: [E1000-devel] question about TX hardware timestamping, it
>doesn't work
>
>Hello,
>
>I apologize for the delay in responding. We do not officially
>support the
>time stamp feature on the 82574 device but we do know that people have
>gotten it working. If the fields in the descriptor are zero,
>its likely its
>not being intialized correctly. I am not an expert on this
>feature, but
>I'll need some more information to try and assist.
>
>If you open a bug on Source Forge on this issue, we can store the data
>gathered there.
>
>Can you send me your initialization code, or at least the
>registers you are
>writing to enable the feature and the values you are writing
>to them. Also,
>the exact fields you are writing in the tx descriptor and the values.
>
>Thanks,
>
>Carolyn
>Carolyn Wyborny
>Linux Development
>LAN Access Division
>Intel Corporation
>
>
>
>>-----Original Message-----
>>From: ?? [mailto:[email protected]]
>>Sent: Sunday, September 19, 2010 2:04 AM
>>To: [email protected]
>>Cc: ??; ???
>>Subject: [E1000-devel] question about TX hardware
>>timestamping, it doesn't work
>>
>>Dear All:
>>
>>
>>
>> On 82574L Chipset, e1000e work well when I need RX
>>hwtimestamp, but
>>it doesn't work when I need TX hwtimestamp
>>
>>
>>
>> Legacy Transmit Descriptor Format is used, and I set
>>the TS bit of
>>ExtCMD to indicates to the 82574 to put a time stamp on the packet
>>designated by the descriptor, of course, I also set the bit4
>>of TSYNCTXCTL
>>to enable TX timestamp.
>>
>>
>>
>> But, it doesn't work, when I read bit0 of TSYNCTXCTL(TX
>>timestamp
>>valid bit) in the TX interrupt service routine(packet has been
>>transmitted),
>>I got zero, and TXSTMPL/H are also filled zero.
>>
>>
>>
>> Any advise to solve this problem is welcome
>>
>>
>>
>> [email protected] li.ang
>>
>>
>>
>> Thanks a lot
>>
>>
>
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