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From: Richard Cochran <>
To: Stathis Voukelatos <>
Subject: Re: [PATCH net-next v4 0/3] Linn Ethernet Packet Sniffer driver
Date: Fri, 27 Feb 2015 19:14:47 +0100	[thread overview]
Message-ID: <20150227181447.GA11594@localhost.localdomain> (raw)
In-Reply-To: <>

On Fri, Feb 27, 2015 at 05:09:24PM +0000, Stathis Voukelatos wrote:
> To summarize (and confirm my understanding) your suggestion is for the
> sniffer to be configured to match PTP packets and (similarly to the
> dp83640) return the Message Type and Sequence Id fields that will allow
> them to be matched to an sk_buf that has been passed from the stack.
> Then the sk_buf can be timestamped using the sniffer timestamp.

> The H/W does have the capability to do that. However, in order to
> implement it there will be some architectural changes needed
> in the kernel. This module cannot really pretend to be a PHY.
> In the real world it sits between the MAC and the PHY.


Here is one idea.  Put a link to the TS device in the PHY's DT node.
Then, in phy_probe, check if the PHY's four methods, ts_info,
hwtstamp, rxtstamp, and txtstamp, are all null.  If so, check for a DT
link from the PHY's node to a TS device driver.  If found, then set
the four methods to call into the TS driver's callbacks.

Just off of the top of my head.


  parent reply	other threads:[~2015-02-27 18:14 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-24 16:48 Stathis Voukelatos
2015-02-24 16:48 ` [PATCH net-next v4 1/3] Linn Ethernet packet sniffer: device tree binding and vendor prefix Stathis Voukelatos
2015-02-24 16:48 ` [PATCH net-next v4 2/3] Linn packet sniffer core framework Stathis Voukelatos
2015-02-24 16:48 ` [PATCH net-next v4 3/3] Linn Ethernet packet sniffer driver Stathis Voukelatos
2015-02-25 15:19 ` [PATCH net-next v4 0/3] Linn Ethernet Packet Sniffer driver Richard Cochran
2015-02-25 17:01   ` Richard Cochran
2015-02-25 17:12     ` Stathis Voukelatos
2015-02-25 17:30       ` Richard Cochran
2015-02-27 17:22         ` Stathis Voukelatos
     [not found]         ` <>
2015-02-27 18:14           ` Richard Cochran [this message]
2015-03-06 13:45             ` Stathis Voukelatos
2015-03-06 15:24               ` Richard Cochran
     [not found]             ` <>
2015-03-06 15:22               ` Richard Cochran
2015-03-11 11:20                 ` Stathis Voukelatos
2015-03-11 15:03                   ` Richard Cochran

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